Answer:
two of them are chemical changes
Explanation:
1.) the copper roof turns green over time: it forms a new substance which is the green deposit known as verdigris .
2.) baking soda is dissolved in vinegar and bubbles form: it forms a new substance which is carbon dioxide gas.
I hope it helps:)
an alligator is 213.4 cm long. how long is he in feet?
Answer:
7.00ft
Explanation:
How many molecules of table sugar are contained in a 2 pound bag of sugar
Answer:
1.59 × 10²⁴ molecules
Explanation:
Step 1: Convert the mass to grams
We will use the relationship 1 lb = 453.59 g.
2 lb × (453.59 g/1 lb) = 907.18 g
Step 2: Calculate the moles corresponding to 907.18 grams of sucrose (table sugar)
The molar mass of sucrose is 342.3 g/mol.
907.18 g × (1 mol/342.3 g) = 2.65 mol
Step 3: Calculate the molecules in 2.65 moles of sucrose
We will use Avogadro's number: there are 6.02 × 10²³ molecules of sucrose in 1 mole of sucrose.
2.65 mol × (6.02 × 10²³ molecules/1 mol) = 1.59 × 10²⁴ molecules
write each set in
(a) DESCRIPTION MEthod
b. ROSTER METHOD,
(c) rULE METHOD
1.whole number less than 15
2.vowels in the name figueroa
3.integers greater than -4
4.months having 30 days
5.consonants in the name Kenneth
Answer:
it is b
Explanation:
because i took the thing
A certain chemical reaction releases 15.6/kJg of heat for each gram of reactant consumed. How can you calculate the heat produced by the consumption of 1.5kg of reactant? the math up. But don't do any of it. Just leave your answer as a math expression.
Answer:
The chemical reaction releases 23400 kilojoules due to 1.5 kg-reactant.
Explanation:
Given the amount of energy released due to reactant consumption, total energy ([tex]Q[/tex]), measured in kilojoules, is determined by the following expression:
[tex]Q = m\cdot L[/tex]
Where:
[tex]m[/tex] - Mass of reactant, measured in kilograms.
[tex]L[/tex] - Released heat ratio, measured in kilojoules per gram.
Given that [tex]m = 1500\,g[/tex] and [tex]L = 15.6\,\frac{kJ}{g}[/tex], the total energy released by chemical reaction is:
[tex]Q =(1500\,g)\cdot \left(15.6\,\frac{kJ}{g} \right)[/tex]
[tex]Q = 23400\,kJ[/tex]
The chemical reaction releases 23400 kilojoules due to 1.5 kg-reactant.
Determine what the spin state of each complex will be using the spectrochemical series along with your chemical intuition. Please explain any complexes that may be difficult to determine. You may assume any 6-coordinate complex has octahedral symmetry and any 4-coordinate complex has tetrahedral symmetry.
a. VCI3(H20)3
b. Fe(NH3)23
Answer:
A) high spin complex
B) low spin complex
Explanation:
A) VCI3(H20)3 is a high spin complex and this is because the complex has a weak field ligands all . this weak field ligands makes it impossible for pairing to take place
B) Fe(NH3)23 is a low spin complex and this is because the complex is made up of strong field ligands, this strong field ligands makes it possible for paring to take place
note : Ligands in which its donor atoms are ; Nitrogen,phosphorous or carbon are considered strong ligands
The value of the equilibrium constant for a reaction is 2.65 x 10-6 at 35° Calculate the value of LaTeX: \DeltaΔG°rxn.
Answer:
234
Explanation:
Describe the energy inputs and outputs for the campfire. Use the law of conservation of energy to construct a valid qualitative equation that includes all the input and output energies involved.
I did some fire simulation work recently where a small paper fire (think like half a ream of printer paper) was putting out 4000 watts, or about 5 horsepower. A large roaring campfire is going to be a few multiples of that depending on size, of course.
The energy of a photon is ________ proportional to its wavelength. The energy of a photon is ________ proportional to its frequency.
Answer: Inversely , Directly
Explanation:
The energy of a photon is inversely proportional to its wavelength and directly proportional to its frequency.
As can be seen from this equation;
E = hv = h c / ∧
Where E = Energy of a photon
v = Frequency
h = Planck Constant
c = speed of light
∧ = Wave length
What are the different forms of energy involved in stretching and releasing a rubber band? What other processes are similar?
Answer:
the answer is elastic potential energy to kinetic energy
Explanation:
A stretched rubber band contains potential energy (specifically called elastic potential energy because the material involved is elastic), which when released, the rubber band tries to return back to it's original shape and size. During the process of this return, the elastic potential energy is immediately converted to kinetic energy.
NOTE: Potential energy can be defined as the energy stored/present in a body at rest. It is usually as a result of the body's position or state. The potential energy stored in an elastic material is called elastic potential energy.
Kinetic energy can simply be described as the energy present in an object that is in motion.
One major process that is similar to the processes above is the mechanical energy, which is the energy involved in an object that has the ability to do work which in this case is a drawn elastic rubber that has the ability to "return" to it's initial state.
In the image, balls that look alike represent the same type of atom. Based on this information, what do the images below represent? A. molecules of compounds B. molecules of elements C. molecules of mixtures D. molecules of water
Answer:
B Is The Correct Answer
In the image, balls that look alike represent the same type of atom. Based on this information, the images below represent molecules of elements. Therefore, option B is correct.
What is an element ?A chemical element is a species of atoms, including the pure substance made entirely of that species, that have a specific number of protons in their nuclei. Chemical elements, in contrast to chemical compounds, cannot be reduced by any chemical process into simpler molecules.
A substance that cannot be converted into another substance is said to be an element. Each type of atom that makes up an element is unique! According to atomic number, elements are listed in the periodic table.
The three categories of elements are metal, non-metal, and metalloid. Metals like sodium, calcium, caesium, and other elements on the extreme left of the periodic table are examples of this. The non-metals, such as carbon, chlorine, and oxygen, are often referred to as the elements on the right side.
Thus, option B is correct.
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Draw all constitutional isomers with the following molecular formula. (a) C3H7Cl (b) C4H10 (c) C5H12 (d) C4H10O (e) C3H6Cl2
Answer:
See explanation
Explanation:
For this question, we must bear in mind that in the isomers what must change is the structure of the molecule but the same condensed formula must be maintained. With this in mind we can have the following options for each of the molecules given by the problem:
(a) [tex]C_3H_7Cl[/tex]
-) 1-Chloropropane
-) 2-Chloropropane
(b) [tex]C_4H_1_0[/tex]
-) butane
-) isobutane
(c) [tex]C_5H_1_2[/tex]
-) n-pentane
-) isopentane
-) neopentane
(d) [tex]C_4H_1_0O[/tex]
-) butan 1-ol
-) butan 2-ol
-) 2-methylpropan-1-ol
-) 2-methylpropan-2-ol
-) 1-methoxypropane
-) ethoxyethane
-) 2-methoxypropane
(e) [tex]C_3H_6Cl_2[/tex]
-) 1,1-dichloropropane
-) 1,2-dichloropropane
-) 1,3-dichloropropane
-) 2,2-dichloropropane
See figure 1 to further explanations
I hope it helps!
Identify the following as physical (P) or chemical (C) changes.
holacomo es tu pregunta nola entiendo
lanation:
Answer:
Where are the questions you want us to identify for you
An aqueous KNO3 solution is made using 75.1 g of KNO3 diluted to a total solution volume of 1.95 L .Calculate the molarity of the solution. (assume a density of 1.05 g/mL for the solution)
Calculate the molality of the solution.
Calculate the mass percent of the solution.
Answer:
- [tex]M=0.38M[/tex]
- [tex]\\ \% m=3.67\%[/tex]
Explanation:
Hello,
In this case, since the molar mass of potassium nitrate is 101.1 g/mol, we can compute the molarity as follows:
[tex]M=\frac{75.1g*\frac{1mol}{101.1g} }{1.95L} \\\\M=0.38M[/tex]
Moreover, as the mass percent is computed as:
[tex]\% m=\frac{m_{KNO_3}}{m_{solution}} *100\%[/tex]
Thus, by using the given density of the solution, we obtain:
[tex]\% m=\frac{75.1g}{1.95L*\frac{1000mL}{1L}*\frac{1.05g}{1mL} } *100\%\\\\ \% m=3.67\%[/tex]
Regards.
The density of a nickel coin was determined by laboratory measurement to be 728 g/mL. A nickel has a mass of 5.040 grams. What is the volume of the nickel?
0.6923 mL
0.692 ml
оооо
36.3 mL
1.43 mL
Answer:
The answer is 0.6923 mLExplanation:
The density of a substance can be found by using the formula
[tex]Density = \frac{mass}{volume} [/tex]
Making volume the subject we have
[tex]volume = \frac{mass}{Density} [/tex]From the question
Density = 728 g/mL
mass of nickel = 5.040 g
Substitute the values into the above formula and solve for the volume
That's
[tex]volume = \frac{5.040}{728} \\ = 0.692307[/tex]
We have the final answer as
Volume of nickel = 0.6923 mLHope this helps you
Answer:
The answer would be 0.6923 mL :)
5. What is the density of a wood block with a mass of 57 g and
a volume of 125 cm3?
Answer:
Density = 0.456 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]Density = \frac{mass}{volume} [/tex]From the question
mass = 57 g
volume = 125 cm³
Substitute the values into the above formula and solve for the Density
That's
[tex]Density = \frac{57}{125} [/tex]We have the final answer as
Density = 0.456 g/cm³Hope this helps you
Convert 0.049 kg sulfur (S) to g of sulfur (S).
Answer:
The answer is
49 g of SulphurExplanation:
To convert kilograms to grams we use the conversion
1 kg = 1000 g
From the question
If 1kg = 1000 g
Then 0.049 kg = 0.049 × 1000
We have the final answer as
49 g
Hope this helps you
=====================================
Balance the chemical equation below using the smallest possible whole number stoichiometric coefficients NH3(g) + O2(g) + CH4(g) → HCN (aq) + H2O(1)
Answer:
[tex]2NH_{3 (g)} + 3O_{2 (g)} +2CH_{4 (g)} --> 2HCN_{(aq)} + 6H_{2}O_{(l)}[/tex]
Explanation:
How does the strength of the bar magnet affect the current in the pickup coil?
Answer:
The induction of current increases in the coil.
Explanation:
The strength of the bar magnet affect the current in the pickup coil because the magnetic field produced by the bar magnet interfere with the field of he coil. By moving the bar magnet in and out of the coil so induction of electric current will be occurs in the soil. If a bar magnet with more strength is moving in the coil then more current will be induced inside the coil.
Several groups of students are attempting to determine the density of a lead weight by various methods. Their data is shown in
the table. A handbook lists the density of lead as 11.3 g/mL.
Group 1
Group 2
Group 3
Measured density (g/mL), trial 1
11.5
11.5
10.9
Measured density (g/mL), trial 2
11.3
11.4
11.3
Measured density (g/mL), trial 3
11.1
11.4
11.1
Average density (g/mL)
11.3
11.4
11.1
Which group was most accurate?
Which group was most precise?
O Group 2
O Group 3
O Group 1
O Group 3
O Group 2
O Group 1
Answer:
accurate: Group 1precise: Group 2Explanation:
Accuracy is a measure of how close a measured value is to the true value. Here, we assume the handbook value (11.3) to be the true value. Group 1 arrived at this number, so must be considered to have made the most accurate measurement.
__
Usually, precision refers to the value of the least significant digit of the measurement. Here, all measurements were made to 3 significant digits, with the least digit being tenths. On that basis, no group can claim better precision than any other.
Another way to consider precision is to look at the variation in measured values. Group 2's values were the most consistent, having a range of 0.1 g/mL. Group 1's values had a range of 0.4 g/mL (from 11.1 to 11.5), and Group 3's values also ranged over 0.4 g/mL (from 10.9 to 11.3).
Because Group 2 had the most consistent readings, we award them the title of most precise.
Answer:
accurate: Group 1
precise: Group 2
Explanation:
Accuracy is a measure of how close a measured value is to the true value. Here, we assume the handbook value (11.3) to be the true value. Group 1 arrived at this number, so must be considered to have made the most accurate measurement.
Obtain a box of breakfast cereal and read the list of ingredients. What are four chemicals from the list
Options:
monoglycerides
cocamide DEA
folic acid
iron chromium ion
peroxide
lauryl glucoside
disodium phosphate
Answer and Explanation:
The added chemicals are:
monoglyceridesfolic acidirondisodium phophatesMonoglycerides are fats added for flavour. Folic cid and iron are vitamins added for nutritional value. disodium phosphate is a food additive for enhancing flavour.
The remaining ingredients are organic based.
Why was 1990 an important year regarding air quality?
O The United States took first steps to keep the air clean.
O The United States created the Environmental Protection Agency.
Modifications and improvements were made to the Clean Air Act.
O Funding was established under the Clean Air Act to study air pollution.
Answer:
C. Modifications and improvements were made to the Clean Air Act.
Explanation:
The Clean Air act was originally established in 1970 and was concerned with the aim of protecting people and the environment in general from polluted air. Polluted air could cause different illnesses and environmental degradation.
The law was amended in 1990 in which modifications and improvements were made to the Clean Air Act. There was the need to reduce acid rain, toxic emissions which could deplete the ozone layer and cause varying respiratory illnesses in humans and to increase visibility.
1990 was an important year to to the United States regarding Air Quality because "Modifications and improvements were made to the Clean Air Act." (Option C)
How is this so?In reality, 1990 was an important year for air quality due to the enactment of significant amendments to the Clean Air Act in the United States.
These amendments, signed into law in November 1990, introduced stricter regulations and requirements to combat air pollution.
The amendments addressed various pollutants, including sulfur dioxide, nitrogen oxides, and hazardous air pollutants, leading to improved air quality standards and a more comprehensive approach to protecting human health and the environment from the harmful effects of air pollution.
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why is it essential to know the water temperature in this experiment- to find the vapor pressure of the water
Answer:
Vapour pressure of a liquid varies with temperature
Explanation:
The vapour pressure of any liquid is directly proportional to the temperature of the liquid. This implies that, as the temperature of the liquid increases, the vapour pressure increases likewise and vice versa.
Since the vapour pressure of liquid varies with the temperature of the liquid, it is essential to know the water temperature in the experiment to determine the vapour pressure of water.
Draw two cyclic constitutional isomers of cis-1-chloro-2-methylcyclobutane with the same size ring. In cases where there is only one cyclic constitutional isomer, just draw one structure.
Answer:
The drawings are in the figure attached below.
Explanation:
"Constitutional isomers" is a term used in chemistry to refer to chemical compounds that have the same constitution and molecular formula distributed in a different structure. That is, the compound has the same atoms, but when built in a three-dimensional image, these atoms occupy different places within the same structure.
Annie is touring Europe for the summer and is traveling by train from Paris, France to Brussels, Belgium. The distance between the two cities is about 195 miles. If she takes the train, which travels an average of 150.0 km/hr, how long, in hours, will the train trip take? (1 km = 0.62 mi)
Answer:
2.10 h
Explanation:
Step 1: Given data
Distance between the two cities: 195 milesAverage speed of the train: 150.0 km/hStep 2: Convert the distance between the two cities to km
We will use the relationship 1 km = 0.62 mi.
195 mi × (1 km/0.62 mi) = 315 km
Step 3: Calculate the time required for the train to travel 315 km
315 km × (1 h/150.0 km) = 2.10 h
Determine the density of a 23.4g block that when placed in 25.00mL of water that causes the water to rise to a level of 28.70mL?
Answer:
Explanation:
Density is the ratio of mass to volume. The SI unit of density is kg/m³. Given that the mass of the block = 23.4 g = 0.0234 kg
The volume of block = change in water level = volume of water rise after block is placed - volume of water = 28.7 ml - 25 ml = 3.7 ml
Volume of block = 3.7 ml = 0.0037 l
1000 l = 1 m³
0.0037 l = 0.0037/1000 m³ = 3.7 × 10⁻6 m³
Density = mass / volume
Density = 0.0234 kg / 3.7 × 10⁻6 m³ = 6324 kg/m³
Calculate how much 95% ethyl alcohol will be required to dissolve 0.3g of sulfanilamide at 78�C. Use the values 78 deg C: 180 mg/ml and 0 deg C: 10 mg/ml
Answer:
1.67mL of 95% ethyl alcohol are required to dissolve completely the sulfanilamide
Explanation:
Solubility is defined as the amount of substance that a determined amount of solvent can dissolve
As you can see, 95% ethyl alcohol at 78°C can dissolve 180mg of sulfanilamide per mililiter. That means solubility is 180mg/mL = 0.180g/mL.
As you want to dissolve 0.3g, you require:
0.3g * (1mL / 0.180g) =
1.67mL of 95% ethyl alcohol are required to dissolve completely the sulfanilamideA balloon has a volume of 4100 cm? What is the volume in liters?
A balloon has a volume of 4100 cm. The volume in liters is 4100000.
What are liters and cubic meters?Liters and cubic meters are the measurement unit of liquid. They are used to write the value of the measurements. There are seven basic units of measurement. The values are liters, kg, meters, grams, milliliters, etc.
A liter is a measurement unit for volume in the metric system. One liter equals 0.001 cubic meters. 1 liter equals 1000 ml. Cubic meters is the SI unit of volume. It is a volume of a cube with a length of 1 cm.
To calculate the value of cubic meters. The calculation of all dimensions is done. The dimensions include length, breadth, and height. A cubic decimeter occupies a volume of 10 cm × 10 cm × 10 cm.
Thus, the volume in liters is 4100000.
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The South Pole has warm summers. True False
Answer:False
Explanation:
Kinda of a opinionated question, but unless you call -12 C warm then the answer is False
Given the following balanced chemical reaction:
3A2+B2 2A3B
If 12 moles of Az are reacted with excess B2, how many moles of A3B will be produced?
Answer:
Explanation:
according to balance chemical equation
3 A2 moles produced 2 moles of A3B
so 12 moles A2 will produced moles of A3B= 12*2/3=24/3= 8
therefore 12 moles of A2 produced 8 moles of A3B
A balanced chemical reaction is an equation that has the same number of stoichiometry coefficients on both sides. When 12 moles of A₂ react, then 8 moles of A₃B are produced.
What are excess reagents?Excess reagents are the reactants that are present in more quantity than the other reactant and are left in reaction after completion.
The balanced chemical equation:
3A₂ + B₂ → 2A₃B
From reaction: 3 moles of A₂ molecule are needed to produce 2 moles of A₃B. So, 12 moles of A₂ will produce:
(12 × 2) ÷ 3 = 8 moles
Therefore, 8 moles of A₃B will be produced from 12 moles of A₂.
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Please Help.What is a solvent? A substance that is dissolved. A) The paper that is placed in the liquid. B) A part of the chromatography apparatus. C) A substance, usually liquid, that can dissolve other substance.
Answer:
C is the answer.
Explanation:
A solvent is a substance that becomes a solution by dissolving a solid, liquid, or gaseous solute. A solvent is usually a liquid, but can also be a solid or gas. The most common solvent in everyday life is water. Most other commonly-used solvents are organic (carbon-containing) chemicals.