Part D
After about 30 minutes, observe the substances in the test tubes again. Record your observations. Include any evidence
of a chemical reaction.
A Caution! If you plan to leave your substances unattended, be sure they are in a safe location away from young children
and pets.
BIY X¹ X₂ 10pt
Test tube
1
2
3
4
5
6
AVE
Observation
Answers
After about 30 minutes, the color in the test tubes remains same as no more reagents are added and no further chemical change is taking place.
What is a chemical change?Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.
There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
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Related Questions
Electronegativity difference between Li-F
Answers
The electronegativity difference between Li (Li: 0.98) and F (F: 3.98) is 3.00.
What is an electronegativity difference?Electronegativity difference is a measure of the relative tendency of an atom in a chemical bond to attract electrons to itself. It is defined as the difference in electronegativity between two atoms in a chemical bond.
A low electronegativity difference indicates that the bond is nonpolar, with both atoms having a similar attraction to the electrons. The difference between the electronegativity of Li and F is large, indicating that the bond between them is highly polar. This means that the F atom has a greater attraction for electrons in a chemical bond than the Li atom, which results in a polar covalent bond.
So subtracting 0.98 of lithium from 3.98 Fluorine to get 3.00 electronegativity difference.
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The complete question is:
What is the Electronegativity difference between Li and F?
How many moles are in rubidium
Answers
Answer:
85.4678
Explanation:
assuming you are converting
grams in 3500mL of Hydrogen sulfide
Answers
The molar mass of hydrogen sulfide is 34.1 g/mol.
What is the formula for converting molarity to grams?To begin, rearranging the equation to determine the number of moles in this solution. No. Molarity (M) x Volume (L) = 0.5 x 2. = 1 mol.
The molar mass of NaCl is 58.44 g/mol. We may now utilize the rearranged equation. (g) = No. 1 x 58.44 = 58.44 g. Moles (mol) × Molar Mass (g/mol) = 1 x 58.44 = 58.44 g.
1 milliliter = 1 gram of water. The weight of the other components varies. 1 mL of milk equals 1.04 g, 1 mL of flour = 0.53 g, and 1 mL of sugar equals 0.85 g.
The concentration represents the solution’s mass concentration, which is represented in density units (often g/l or g/ml). Molar mass is the mass of one mole of a substance.
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Compound i has a melting point of 545°C and dissolves well in water
Answers
Compound 1 has a melting point of 545 degrees Celsius and easily dissolves in water, whether it is ionic or not. Compound 2 is a brittle substance that is used to melt ice on the roads during storms, whether it be ionic or not. Bond length and bond energy both decrease as the number of bonds rises.
What is Ionic Compounds?
Ionic compounds are described as substances that are connected by ionic bonds. Elements can either absorb or lose electrons to attain their closest arrangement as a noble gas. As ions are produced to finish the octet, they get more stable.
In a reaction with non-metals, metals normally lose electrons to complete their octet while non-metals typically gain electrons to complete their octet. Typically, metal and nonmetal reactions result in the formation of ionic compounds.
The structure of an ionic molecule is determined by the proportional sizes of the cations and anions. Examples of ionic compounds include salts, oxides, hydroxides, sulphides, and the bulk of inorganic substances. Ionic solids are held together by the electrostatic interaction of the positive and negative ions.
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Question 7
If you wish to obtain 37.7 grams of iron metal from iron(III) oxide, what mass of iron(III) oxide (in
grams) must you use? Enter to 1 decimal place.
Answers
Approx. 15g of metal.
what mass of iron?The elemental symbol for iron is Fe, and the molecular mass is 55.845 to three decimal places, according to the periodic table.It is the element of period number 4 and group number 8, and the atomic number of the iron element is 26. So, the atomic mass or molar mass of iron will be the same and it is equal to 55.845 g/ molThe basic unit of mass in the metric system is the gram. If a box that is 1 cm long on all sides is filled with water; then the mass of water is 1 gram. 1gram = the mass of water in the box. The units of mass in the metric system have the same prefixes as the units of length: 1 Kilogram (kg) = 1000 grams (g)
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A strip of aluminum foil is placed in concentrated sulfuric acid
Answers
Answer: Aluminium reacts with hot, concentrated sulphuric acid to form aluminium sulphate with the evolution of sulphur dioxide gas. It is a redox reaction. Sulphuric acid acts an oxidising agent, and gets itself reduced to SO2. Only with the dilute acid, the metal liberates hydrogen gas.
Explanation:
Answer: Aluminium reacts with hot, concentrated sulphuric acid to form aluminium sulphate with the evolution of sulphur dioxide gas. It is a redox reaction. Sulphuric acid acts an oxidising agent, and gets itself reduced to SO2. Only with the dilute acid, the metal liberates hydrogen gas.
When 17.1 g of an organic compound known to be 54.53% C , 9.2% H , and 36.32% O by mass is dissolved in 808.3 g of water, the freezing point is −0.298 ∘C . The normal freezing point of water is 0 ∘C . What is the molecular formula for the organic compound? Assume that the organic compound is a molecular solid and does not ionize in water. f values for various solvents are given in the colligative constants table.
Answers
The molecular formula for the organic compound is [tex]C_{4} H_{8} O_{2}[/tex].
What is molecular formula?The molecular formula is described as the formula derived from molecules and is representative of the total number of individual atoms present in a molecule of a compound.
We can find the molecular formula from the empirical formula and the molar mass. So first, we need the empirical formula.
C: 54.53 g x 1 mol/12 g = 4.5 moles H: 9.2 g x 1 mol/1 g = 9.2 moles O: 36.32 g x 1 mol/16 g = 2.27
Therefore [tex]C_{2} H_{4} O[/tex] is the empirical formula with a molar mass of 44 g/mol. Since molar mass of the unknown is 86 g/mol, the molecular formula of the unknown is [tex]C_{4} H_{8} O_{2}[/tex] .
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please do it correct ill give u the brainliest
Answers
The statement which interpret the object motion is the object moves with a constant positive velocity and then stops moving. The slope represents velocity. Therefore, option B is correct.
What is velocity ?The term velocity is defined as vector expression representing the change in position over time of an object or particle. It is also known as speed.The unit of velocity magnitude is the meter per second (m/s).
A positive velocity merely indicates that an object is moving in the coordinate system's positive direction, whereas a negative velocity denotes that the item is going in the opposite direction.
Thus, option B is correct.
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What name is given to substances (both soluble and insoluble) such as metal hydroxides and metal oxides that can neutralise acids?
Answers
The name given to substances (both soluble and insoluble) such as metal hydroxides and metal oxides that can neutralise acids is bases.
How do metal hydroxides and metal oxides neutralize acids?Metal hydroxides and metal oxides neutralize acids by reacting with the hydrogen ions (H+) in the acid. The acid and the metal hydroxide/oxide react to form water and a salt. For example, when metal hydroxide reacts with hydrochloric acid, it forms water and chloride ions. The neutralization reaction is an exothermic one, which generates heat and the chemical reaction is accompanied by the formation of water. The H+ ions from the acid combine with the hydroxide ions from the metal hydroxide or metal oxide to form water, thereby neutralizing the acid.
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is the following process spontaneous?
Answers
without temperature cannot tell
chegg
How much P-32 was present originally if, after 72.5 days, 2.0 grams remain ( half-life of 32P is 14.3 days)? Show what equation you will use to solve this problem, substitute in your values, show yourself working through the half lives with a --> arrow or <-- arrow to get to your final answer (original sample amount) in grams
Answers
P-32 was present originally if, after 72.5 days, 2.0 grams remain ( half-life of 32P is 14.3 days) is 3 grams.
What is half life period ?The term half life period is defined as the time needed by a radioactive substance to disintegrate or transform into a different substance.
Divide 72.5 days by the half-life 14.3 of days. You will get an integer. This is the number of half-lives involved. You have been given an easy example.
42.9 / 14.3 = the number of half-lives involved
= 3
Multiply 1/2 by itself the same number of times as the number of half-lives calculated above.
= 3 × 1/2
= 1.5
Multiply that result by the mass of your sample.
= 1.5 × 2.0
= 3
Thus, P-32 was present originally if, after 72.5 days, 2.0 grams remain ( half-life of 32P is 14.3 days) is 3 grams.
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Can someone held me with 3 and 5 and then confirm that 4 is correct? (1 aluminum can=12.8g)
Answers
There are 2.85 x 10²³ number of aluminum atoms in one aluminum can with mass of 12.8 g
What is the number of aluminum atom and density of aluminum in an aluminum can?4. Atom (aluminum) molar mass = 27g/mol
Aluminum atom mass (should be given in question) = X
Mass = 12.8 grams.
The Avogadro number is 6.022 x 10²³.
Mole = mass (as given) / molar mass
Mole = number of aluminum atoms Avogadro's formula
Or
(Mass / molar mass) x Avogadro's number = number of aluminum atoms
Putting all of the above-mentioned values into the formula,
The number of aluminum atoms is = (12.8 / 27) x 6.022 x 10²³
= 2.85 x 10²³
Therefore the number of aluminum atoms is 2.85 x 10²³
5. The mole is a unit of measurement that can be used to compare particles (molecules and atoms), volume, and mass.
The mole contains 6.02 x 10²³ molecules.
Avogadro's number is the number of molecules. At standard temperature and pressure, one mole equals 22.4 liters of gas (STP). Furthermore, the mole is equal to the element's or molecule's molar mass (gfm).
Aluminum has an atomic mass of 26.99 amu. As a result, a 1 mole sample of aluminum would weigh 26.99 grams.
We can use the density to calculate the volume once we know the mass of the mole of aluminum. D= v m is the density equation, where D = density, 3 = mass, and v = volume.
Aluminum's standard density is 2.70 g/cm³.
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8. Look at the Periodic Table. Identify an element that has similar chemical
properties to the chemical properties of Neon?
(C) Copper
(D) Cadmium
(A) Argon
(B) Boron
Answers
The chemical elements are arranged in a tabular array called the periodic table according to atomic number.
How do you explain the periodic table?From hydrogen, which has the lowest atomic number, to oganesson, which has the highest atomic number, the periodic table is a table that displays the chemical elements in order of increasing atomic number. The quantity of protons in an element's atomic nucleus is known as the element's atomic number.
In the same group or column of the periodic table are the elements that share the most chemical similarities. By atomic number, the elements are arranged vertically into groups with the same number of valence electrons and, thus, similar chemical characteristics.
Lithium (Li), sodium (Na), and potassium (K) are three members of such a group: These elements are all bright, have good heat and electrical conductivity, and share many chemical characteristics.
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select which elements contain atoms at ground state with 5 electron layers.
A) rubidium
b) palladium
c) potassium
D) tin
Answers
Answer:
potassium
Explanation:
because it more explosive
5 moles of Fe(OH)3 react with sulfuric acid to produce Fe2(SO4), and water.
A) How many moles of sulfuric are required?
B) How many moles of each product are produced?
C) How many grams of each product is produced?
Answers
For 5 moles of Fe(OH)3, 5 moles of sulfuric acid are needed.
What is moles?Moles are small, burrowing mammals found in many parts of the world. They are members of the family Talpidae, and range in size from about two inches to about eight inches in length, depending on the species. Moles have cylindrical bodies with short, velvety fur and enlarged front feet adapted for digging. They feed primarily on small insects and earthworms, and their long claws make them excellent tunnelers. Moles live in underground burrows which they dig out with their front feet and claws. They are solitary creatures, and they are active day or night. Moles are rarely seen above ground, and they are generally considered to be harmless animals.
A) In order to calculate the number of moles of sulfuric acid needed to react with 5 moles of Fe(OH)3, we can use the balanced chemical equation for this reaction: 3Fe(OH)3 + 3H2SO4 → Fe2(SO4)3 + 6H2O. From this equation, we can see that for every 3 moles of Fe(OH)3, 3 moles of sulfuric acid are required. Therefore,
for 5 moles of Fe(OH)3, 5 moles of sulfuric acid are needed.
B) From the balanced chemical equation for this reaction, we can see that for every 3 moles of Fe(OH)3, 3 moles of Fe2(SO4)3 are produced. Therefore, for 5 moles of Fe(OH)3, 5 moles of Fe2(SO4)3 are produced. Additionally, for every 3 moles of Fe(OH)3, 6 moles of water are produced. Thus, for 5 moles of Fe(OH)3, 10 moles of water are produced.
C) The mass of each product produced can be calculated by using the molar mass of the corresponding compound. For example, the molar mass of Fe2(SO4)3 is 392.16 g/mol. Therefore, for 5 moles of Fe2(SO4)3, the mass of the product produced is 1960.8 g. Similarly, the molar mass of water is 18.015 g/mol. Therefore, for 10 moles of water, the mass of the product produced is 180.15 g.
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any atom or molecule with a net charge, either positive or negative, is known as an
Answers
Answer: ion
Explanation:
Ions that consist of more than one atom are known as _____. solutions polyatomic compounds multi-ions
Answers
Ions that consist of more than one atom are known as polyatomic ion.
What are polyatomic ions?A covalently bound collection of two or more atoms or of a metal complex that may be said to act as a single unit and that has a net charge that is not zero is referred to as a polyatomic ion or a molecular ion. Depending on the terminology employed, a polyatomic ion may or may not be referred to as a molecule.Polyatomic ions are ions made up of several atoms. One nitrogen atom and three oxygen atoms, for instance, are present in the nitrate ion, NO3-. A polyatomic ion's constituent atoms are often covalently bound to one another, remaining as a single, charged particle as a result.Learn more about Polyatomic ions refer to ;
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NEED ASAP!
What is the resolution of a monochromator, Δλeff, with a exit slit width of 500 micrometers and a [tex]D^{-1}[/tex] of 1.8 nm/mm? Express the answer in nm.
Answers
The resolution of the monochromator is 3.6nm
What is a MonochromatorA monochromator is an optical device that is used to isolate a specific wavelength or range of wavelengths of light from a broader spectrum of light. It is typically used in spectroscopy, where the goal is to measure the intensity of light at a specific wavelength or over a range of wavelengths.
The resolution of a monochromator, Δλeff, is given by the equation: Δλeff = (D^-1) * (exit slit width)
Plugging in the given values:
Δλeff = (1.8 nm/mm) * (500 micrometers)
Converting micrometers to millimeters:
Δλeff = (1.8 nm/mm) * (0.5 mm)
Δλeff = 3.6 nm
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The salty nature of ocean water is the result of interactions among
various environmental processes constantly adding and removing "ingredients
that make up different types of salts. The diagram below illustrates how
the diagram shows that magnesium is added to ocean water by rivers and is
these processes tend to keep the salt components in balance. For example,
removed by ocean water reacting with the oceanic crust. Interactions such as
these keep the overall percentage of salts in ocean water at about 3.5 percent.
Volcanic eruptions add:
Chloride
Sulfate
Magnesium
Sulfate
Continental
Crust
Ocean water reacts with
hot oceanic crust.
Removes:
Adds:
• Calcium
• Potassium
River
Organisms remove:
• Calcium
Nitrate
Silica
Rivers add:
Calcium
Carbonate
Magnesium
Silica
Sodium
Mantle
Continental
Crust
below
Oceanic
Crust
Salts deposited
in basins remove
Calcium
Potassium
• Sodium
Answers
Two factors contribute to the ocean's salt content: seabed openings and runoff from the land.
Why is the ocean salty?Most salts that dissolve in seawater come from rocks on land. Rocks crumble because of the mild acidity of rainwater that falls on land. Ions are released as a result, and these ions are transported away by streams and rivers before entering the ocean. Oceanic creatures use a large portion of the dissolved ions, which are then drawn out of the water. Others are left behind, and over time, their concentrations rise.Hydrothermal fluids, which emerge from seafloor vents, are another source of salts in the ocean. Water from the ocean seeps into seafloor fissures and is warmed by lava from the planet's core. Many chemical reactions are triggered by the heat. While picking up metals like iron, zinc, and copper from the nearby rocks, the water tends to lose oxygen, magnesium, and sulfates. Through seafloor vents, the hot water is expelled, carrying the metals with it. Volcanic eruptions that occur undersea that discharge minerals into the ocean are the source of some ocean salts.To Learn more About ocean's salt refer To:
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PLSSSSS HELLP
ASAPPPPPP: When you evaluate a website, you are looking to make sure a website is
ruthful. Which item does not indicate a truthful website?
Opublisher or author
Ofactual information
Orecent date of creation or revision
Oopinion
Answers
Answer:
Opinion does not indicate a truthful website. When evaluating a website, you should look for indications of accuracy, such as the publisher or author, the actual information provided, and the recent date of creation or revision. Opinion does not provide any indication of the accuracy of the website.
Explanation:
A 100. g strip of alloy containing iron and copper in equal amounts is placed in a burner that supplies 4.0 kJ of heat. If the initial temperature of the alloy is 20.0 oC, what is the final temperature of the alloy? (cp for iron is 0.460 J/g oC. and cp for copper is 0.385 J/g oC).
Answers
The final temperature of a 100g strip of alloy made up of iron and copper is 67.34°C.
How to calculate temperature?Calorimetry is the science of measuring the heat absorbed or evolved during the course of a chemical reaction or change of state.
The temperature of a substance using calorimetry procedure can be calculated as follows:
Q = mc∆T
Where;
Q = quantity of heat absorbed or releasedm = mass of substance∆T = change in temperaturec = specific heat capacityAccording to this question, a 100g strip of alloy containing iron and copper in equal amounts is placed in a burner that supplies 4.0kJ of heat.
4000 = 100 × (0.46 + 0.385) × {T - 20°C}
4000 = 84.5 {T - 20°C}
4000 = 84.5T - 1690
84.5T = 5690
T = 67.34°C
Therefore, 67.34°C is the final temperature of the alloy.
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If a hydrocarbon consists of 7 Carbon atoms and only contains single bonds, how many Hydrogen atoms does it
have?
Answers
16
Explanation:Hydrocarbons are compounds that only consist of hydrogens and carbons.
Saturation
For a hydrocarbon to be saturated, it must have the maximum amount of possible hydrogens. This means that a hydrocarbon will only have single bonds. The hydrocarbon described in the question (known as heptane) is saturated. To find the number of hydrogens in a saturated hydrocarbon we can use the formula 2x+2, where x is the number of carbons.
2(7) + 2 = 16Thus, the hydrocarbon has 16 hydrogens.
Lewis Structure
The formula above is based on the Lewis structure of hydrocarbons. The Lewis structure of a compound is a visual representation of the elements and bonds within the compound. Another way to find the number of hydrogens is by drawing the complete Lewis structure and then counting the hydrogens. Attached below is the Lewis structure of heptane.
A soda is liquid that contains ____ gas to make it bubble and fizz.
Answers
Answer:
Carbon dioxide
Explanation:
What amount of energy is required to change a spherical drop of water with a diameter of 1.20 mm to three smaller spherical drops of equal size? The surface tension, , of water at room temperature is 72.0 mJ/m2
.
Answers
7.0329 x10 mm] -4.43x104m√ = 2. * 6029 * Ten ^ - 4 * m I Water has a surface tension of 72.0 mJ/m2 at normal temperature.
What kind of energy is needed to transform a water drop with a 2.20 mm diameter into four smaller drops with the same size?
At room temperature, water has a surface tension of 72.0 mJ/m2.
I'll try it out even if it seems like a physics challenge rather than a chemical one.
Surface area of the sphere equals 4 r2.
Radius, diameter, and volume of sphere are equal to (4/3)r3 2.20 mils = 1.10 mils
The four new droplets' surface tension differences with the original droplet are?
The energy needed to complete the specified task would be 0.00173 mary jane - 0.00114 w / mk = 0.00059 mary jane = 5.9x10-4 mJ.
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7.0329 x10 mm] -4.43x104m√ = 2. * 6029 * Ten ^ - 4 * m I Water has a surface tension of 72.0 mJ/m2 at normal temperature.
What kind of energy is needed to transform a water drop with a 2.20 mm diameter into four smaller drops with the same size?At room temperature, water has a surface tension of 72.0 mJ/m2.
I'll try it out even if it seems like a physics challenge rather than a chemical one.
Surface area of the sphere equals 4 r2.
Radius, diameter, and volume of sphere are equal to (4/3)r3 2.20 mils = 1.10 mils
The four new droplets' surface tension differences with the original droplet are?
The energy needed to complete the specified task would be 0.00173 mary jane - 0.00114 w / mk = 0.00059 mary jane = 5.9x10-4 mJ.
(NOTE: I just saw Brian L's "comment," and this solution is in fact rather similar to his response of 6.4x10-4 mJ.)
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Cu + 2AgNO3 → 2Ag + Cu(NO3)2
How many moles of copper must react to form 0.854 mol Ag?
mol Cu
Answers
As per the given balanced chemical equation, one mole of copper metal reacts to form 2 moles of Ag. Hence, the number of moles of Cu to form 0.854 moles of Ag is 0.427.
What is copper ?Copper is a transition metal in d block of periodic table. Copper forms ionic compounds by losing electrons. As other transition metals copper shows variable oxidation states.
The given reaction is a single displacement reaction between two metals. Nitrate group exchanges between the metals Cu and Ag. In the given reaction, one mole of Cu reacts with 2 moles of silver nitrate giving two moles of Ag and one mole of copper nitrate.
The number of moles of Cu required to produce 0.854 mol of Ag is calculated as:
no.of moles of Cu = 0.854 / 2 = 0.427 moles.
Hence, 0.427 moles of Cu is needed.
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3. The wave number of a line in the Lyman series is 97547 em-1. Which line in the series is this?
Answers
In the ultraviolet spectrum, excited atoms emit electromagnetic energy that is described by the Lyman series of wavelengths.) Lyman's emissions are only marginally absorbed by the atmosphere's main gases, O, O2, and N2.
The Lyman series formula is what?λ1=R[n121−n221] N1=1 for Lyman. From the equation above, it is clear that the photon with the Lyman maximum wavelength is only ejected when a transition takes place immediately after the next highest orbit, or when n2=2. So, λ1=R[1−41]
What is the Lyman series' scope?The Lyman series' comparable range is from 91 to 122 nm, and the Balmer series' is from 365 to 656 nm. We are aware that the visible spectrum of electromagnetic waves ranges between 400 and 700 nanometers, which unmistakably falls inside the Balmer series.
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HELP IS NEEDED RIGHT NOW!!!!!!
Answers
1. Eukaryotes and Prokaryotes: I have a cell membrane (plasma membrane)
2. Eukaryotes: I have nucleus
3. Prokaryotes: Bacteria are an example of me
4. Eukaryotes: Fungi are an example of me.
5. Eukaryotes: Animals are an example of me.
6. Eukaryotes: I contain ribosomes.
7. Eukaryotes: I contain membrane-bound organelles.
8. Eukaryotes and Prokaryotes: I contain cytoplasm.
9. Eukaryotic cell: Your body cells are made of this type of cell.
10. Eukaryotes: Protists are an example of me.
11. Eukaryotes: Plants are an example of me.
12. Eukaryotes and Prokaryotes: I contain genetic material such as DNA.
What are Eukaryotes and Prokaryotes?Prokaryotes are organisms that are composed of cells that do not have a cell nucleus or any membrane-encased organelles.
Eukaryotes are organisms that are composed of cells that have a cell nucleus or any membrane-encased organelles.
An example of a prokaryote is bacteria. Fungi are an example of a eukaryote.
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Please help me do this and provide me the right answer as soon as possible and this is for my living environment final
Answers
The molecular formula for glucose is C6H12O6, and it has a 6-carbon structure. It is a constant source of energy for all living things and is necessary to power both anaerobic and aerobic cellular respiration.
How does glucose form and where it is found?In order to create cellulose, the most prevalent carbohydrate in the world, glucose is primarily produced by plants and the majority of algae during photosynthesis from water and carbon dioxide with the help of solar energy. Despite having the same number of atoms, these two forms of glucose are (stereo)isomers because of the differences in how those atoms are arranged in space.
D-glucose has two stereoisomers, alpha-D-glucose and D-glucose, with specific rotations of +112° and +19°, respectively. It is only at the carbon atom that is home to the aldehyde functional group that the structural isomers of glucose, alpha D and beta D, diverge. These are anomers, thus. Only a minor amount of energy is released as a result of the breakdown of glucose into smaller molecules in the cytoplasm, which does not include oxygen.
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If you have a phone with facial recognition software or a laptop that unlocks with the touch of a finger, you’ve already experienced the world of biometrics. Biometrics is a way of identifying people based on their physical traits. But even though biometric technology is everywhere these days, it comes with serious—and potentially permanent—risks to users. For this reason, biometrics should not be used to protect particularly sensitive information like bank accounts and credit card credentials.
Proponents of biometric technology argue that it’s more secure than a traditional PIN or password. Everybody has unique fingerprints and retina, for example, so biometric data should be impossible to fake. Yet this reliance on unique traits is also one of biometrics’ biggest problems. Imagine someone lifts your fingerprints from a surface. If you have a touch identification system set up on your devices or accounts, a hacker could theoretically use those prints to gain access. And once that happens, your security might be compromised forever. After all, you can always change a password, but not your physical characteristics.
Which of the following best describes the perspective presented in this passage?
A
Hackers have developed methods to steal biometric data.
B
Biometric technology is not secure enough to guard sensitive information.
C
Biometric technology is safer than a traditional password or PIN.
D
Biometrics is a way of verifying identity based on physical characteristics.
Answers
Answer:
write
threetypesofisomerismthatalkenescanexhibit?
Complete the equations for these single replacement reactions in aqueous solution. Zn(s) + H2O(l) ->
Answers
The complete and balanced equation of the single replacement reaction would be [tex]Zn (s) +2 H_2O (l) --- > Zn(OH)_2 (s) + H_2 (g)[/tex]
Equation of reactionsSolid zinc metal reacts with liquid water to produce hydrogen gas and zinc hydroxide precipitate as follows:
Formula for solid zinc metal = Zn (s)
Formula for liquid water = H2O (l)
Formula for zinc hydroxide precipitate =Zn(OH)2 (s)
Formula for hydrogen gas = H2 (g)
Combining all the components together, the overall equation of the reaction would become:
[tex]Zn (s) +2 H_2O (l) --- > Zn(OH)_2 (s) + H_2 (g)[/tex]
In other words, the complete equation for the single replacement reaction illustrated would be [tex]Zn (s) +2 H_2O (l) --- > Zn(OH)_2 (s) + H_2 (g)[/tex].
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