The first periodic table was organized according to atomic mass, but the current periodic table is arranged according to atomic number. What is the difference between atomic mass and atomic number, and why is the atomic number now the basis for the periodic table?
Answer: Atomic mass is associated with the number of neutrons and protons that are present in a particular nucleus of an element. Atomic number is usually the number of protons present in an element's nucleus. It is the average weight of an element. It is the total number of nucleons in the atom's nucleus.
Assuming there were errors in atomic masses, Mendeleev placed certain elements not in order of increasing atomic mass so that they could fit into the proper groups (similar elements have similar properties) of his periodic table.
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SOLVE The density of a gas is 0.68 g/mL. What amount of space would 23.8 g of this gas occupy?
Answer:
The answer is 35 mLExplanation:
Density of a substance can be found by using the formula
[tex]Density(\rho) = \frac{mass}{volume} [/tex]
From the question we are finding the amount of space the gas will occupy that's the volume of the gas
Making volume the subject we have
[tex]volume = \frac{mass}{Density} [/tex]
From the question
mass = 23.8 g/mL
Density = 0.68 g/mL
Substitute the values into the above formula and solve
That's
[tex]volume = \frac{23.8}{0.68} [/tex]
We have the final answer as
35 mLHope this helps you
What would be the new pressure if 250cm3 of gas at standard pressure is compressed to a volume of 150 cm3
Answer:
5/3 or 1 2/3 atmospheres.
Explanation:
If the temperature is kept constant then P*V will be constant.
The standard pressure is 1 Atm. so:
250 * 1 = 150 * V
V = 250 / 150
= 5/3 Atm.
The new pressure of gas is 126.66 mm Hg at constant temperature according to Boyle's law.
What is Boyle's law ?
Boyle's law is an experimental gas law which describes how the pressure of the gas decreases as the volume increases. It's statement can be stated as, the absolute pressure which is exerted by a given mass of an ideal gas is inversely proportional to its volume provided temperature and amount of gas remains unchanged.
Mathematically, it can be stated as,
P∝1/V or PV=K. The equation states that the product of of pressure and volume is constant for a given mass of gas and the equation holds true as long as temperature is maintained constant.
According to the equation the unknown pressure and volume of any one gas can be determined if two gases are to be considered.That is,
P₁V₁=P₂V₂
∴P₂=760×250/150=126.66 mm Hg
Therefore, the final pressure of the gas is 126.66 mm Hg.
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what is the definition of a radical
Answer:
Molecule that contains at least one unpaired electron is called a radical.
Answer:
In chemistry, a radical is an atom, molecule, or ion that has an unpaired valence electron. With some exceptions, these unpaired electrons make radicals highly chemically reactive. Many radicals spontaneously dimerize. Most organic radicals have short lifetimes.
Atoms are made up of protons,
neutrons, and electrons.
Is that a fact, hypothesis, law or theiry
Answer:
It's a fact
Explanation:
6. Using the rules of significant figures, calculate the following:
6.167 +52
5.10
A) 11.4
B) 12
C) 11
D) 63
E) 11.41
Answer:
A. 3
B . 2
C. 2
D. 2
E. 4 significant figures
3) Two plants are grown using the same light and pots. One plant is given water that has been
microwaved and the other plant is given regular tap water. Their height is measured after 2 weeks.
What are the independent and dependent variables?
Answer:
Independent variable- nature of irrigation water
Dependent variable- height of the plants
Explanation:
In every study, there must be an independent and a dependent variable. The dependent variable changes its value as the value of the independent variable changes.
When the nature of irrigation water is manipulated, the height of the plant changes accordingly. This implies that the nature of irrigation water (microwaved or tap water) is the independent variable while the height of the plant (the response) is the dependent variable.
As an organism begins to learn more and more about its environment, it will begin to construct a complex mental representation of that data called a _____
Latent map
Cognitive redux
Cognitive map
Latent redux
Answer:
Cognitive map
Explanation:
A cognitive map is a mental representation of one's physical environment.
Cognitive Map
Explanation:
As an organism begins to learn more and more about its environment, it will begin to construct a complex mental representation of that data called a Cognitive Map
the chloride of a metal M contains 47.25% of metal 1.0 gram of metal would be displaced from a compound by 0.88 gram of another metal N . find the equivalent weight of M and n.
Answer:
The equivalent weight of M is approximately 31.8 g
The equivalent weight of N is approximately 27.98 g
Explanation:
The given parameters are;
The percentage of the the metal M in in the chloride = 47.25%
Where by the chemical formula for the metal chloride is MClₓ, we have;
47.25% of the mass of MClₓ = Mass of M = W
Therefore, we have;
[tex]\dfrac{0.4725}{W} = \dfrac{1}{W + 35.5 \cdot x}[/tex]
0.4725 × (W + 35.5·x) = W
0.4725·W + 0.4725×35.5×x = W
W - 0.4725·W = 16.77·x
0.5275·W = 16.77·x
W/x = 16.77/0.5275 = 31.799 = The equivalent weight of M
The equivalent weight of M = 31.799 ≈ 31.8 g
Given that 1 gram of M is displaced by 0.88 gram of N, then the equivalent weight of N that will displace 31.799 = 0.88 × 31.799 ≈ 27.98 g
The equivalent weight of N = 27.98 g.
In the reaction of silver nitrate with sodium chloride, how many grams of silver chloride will be produced from 100. g of silver nitrate when it is mixed with an excess of sodium chloride? The equation for the reaction is below. AgNO3 + NaCl → AgCl + NaNO3
Answer:
The mass in grams of silver chloride, AgCl produced is 84.37 grams
Explanation:
The chemical equation for the reaction is given as follows;
AgNO₃ + NaCl → AgCl + NaNO₃
The mass of silver nitrate, AgNO₃, in the reaction = 100.0 g
Therefore, 1 Mole of AgNO₃ produces 1 mole of AgCl,
The molar mass of silver nitrate, AgNO₃ = 169.87 g/mol
The number of moles of silver nitrate, AgNO₃, in the reaction = 100/169.87 moles
The number of moles of silver nitrate, AgNO₃, in the reaction ≈ 0.59 moles
Since 1 mole of AgNO₃ produces 1 mole of AgCl, 0.59 moles of AgNO₃ produces 0.59 moles of AgCl
The number of moles of silver chloride, AgCl produced = 0.59 moles
The molar mass of silver chloride, AgCl = 143.32 g/mol
Therefore;
The mass of silver chloride, AgCl produced = The number of moles of silver chloride, AgCl produced × The molar mass of silver chloride, AgCl
Which gives;
The mass of silver chloride, AgCl produced = 143.32 g/mol × 0.59 moles = 84.37 g
The mass of silver chloride, AgCl produced = 84.37 g.
The mass of silver chloride produced is 84.37g.
The equation of the reaction is; AgNO3 + NaCl → AgCl + NaNO3
Number of moles of silver nitrate = mass of silver nitrate/Molar mass of silver nitrate
Molar mass of silver nitrate = 170 g/mol
Number of moles of silver nitrate = 100 g/170 g/mol = 0.59 moles
Mass of silver chloride = 0.59 moles × 143 g/mol = 84.37g
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Question 9 of 10
A team of engineers has decided to design a new shoe for people suffering
from a painful foot condition. What should the engineers do during the
planning stage of their project?
A. Look at the trial's results to see how the design can be improved.
O B. Estimate how much potential consumers would be willing to pay
for this new shoe.
C. Have patients wear the new shoe in an experimental trial to see if
symptoms improve.
D. Build a variety of shoe models.
PLEASE HELP PLEASE ASAP
air pollution would cause trees to die and animals to die . It would coaus most harm by killing everything on land and in the sea beacuse the animals that die might wash away in the ocean killing other animals slowly but surely. and it doesnt help there is soil erosion sooner rather that later it will turn into nothing.
Explanation:
Iron has a density of 7.87mL. How much mass would a 12.3mL sample contain?
The correct answer is 96.80 grams
Explanation:
The density of a substance shows the total mass the substance contains in 1 mL or 1 cm3 as density is calculated by using the formula D= M (mass) / V (volume). This implies, Iron contains 7.87 grams per milliliter. Moreover, this value and formula can be used to calculate the mass or volume of any other sample. The process to calculate the mass of an iron sample with a volume of 12.3 mL is shown below.
D = M ÷ V
7.87 mL = x ÷ 12.3 mL - x represents the missing value. Now find the value of x by solving the equation
x = 7.87 · 12.3
x = 96.80
This means a sample of 12.3 mL contains a mass of 96.80 grams. Also, you can know this value is correct because if you divide the mass by the value the density is the same (96.80 grams ÷ 12.3 mL = 7.87 g/mL)
10) A student’s calculation w as found to have a 15.6% error, and the actual value w as determined to be 25.7 mL. W hat are the tw o possible values for the student’s experimental measurement?
Answer:
The actual value = 25.7 ml
The error = 15.6%
This means that the value of error = 0.156 * 25.7 = 4.0092 ml
Now, the error percentage found means that the student got the value either greater than the actual one with the value of error or less than the actual one with the value of error.
This means that the two possible readings are:
either : 25.7 + 4.0092 = 29.7092 ml
or : 25.7 - 4.0092 = 21.6908 ml
Explanation:
1. In which state of matter can the particles move fast freely? 2. In which state of matter are the particles closet together? 3. Sketch a simple diagram to compare the arrangement of the particles in 1 and 2.
Explanation:
1. Particles in the gaseous form can move freely because it is widely spread out.
2. Particles in solid are the tightly packed
True or False: In every gram of sucrose (table sugar) there is 0.513 g of oxygen
Answer:
True
Explanation:
Step 1: Find molecular formula of sucrose
C₁₂H₂₂O₁₁
Step 2: Convert moles of oxygen present to grams
1 mol O = 16 g O
11 mol O = 176 g O
Step 3: Find molar mass of sucrose
C - 12.01 g/mol
H - 1.01 g/mol
O - 16.00 g/mol
12.01(12) + 22(1.01) + 11(16.00) = 342.34 g/mol C₁₂H₂₂O₁₁
Step 4: Set up dimensional analysis
[tex]1 gC_{12}H_{22}O_{11}(\frac{176 gO}{342.34gC_{12}H_{22}O_{11}} )[/tex]
Step 5: Multiply/Divide and cancel out units
Grams of C₁₂H₂₂O₁₁ and grams of C₁₂H₂₂O₁₁ cancel out.
We are left with grams Oxygen
176/342.34 = 0.514109 grams Oxygen
which is a example of a three dimensional measurement of volume a. 120 cubic meters b. 120 grams c. 120 miles per hour d. 120 units pls help I'm not smart
Answer:
120 cubic meters
Explanation:
Three-dimensional measurement is basically any unit of measurement cubed. Since grams is just to the first power, it is not considered three-dimensional. miles per hour is a fraction, so it is not a three-dimensional measurement of volume. 120 units are to the first power, so you are left with 120 cubic meters, which is a three-dimensional measurement of volume. Also, another way to solve this is to look at the types of measurement. The cubic meter is a measure of volume. Grams are a measurement of mass. Miles per hour is a measurement of speed. Units can be any type of measurement because you can substitute units instead of any measurement in questions.
Which model best illustrates Thomson’s explanation of the atom? Answers in the picture.
pluses and negatives
D) because it has negative and positive signs
Answer:
D. This D one model best illustrates Thomson explanation of atom
Explanation:
Imagine you are looking at a bottle of salad dressing containing oil, vinegar, and water. Why are there two layers in the salad dressing? Water and vinegar are both hydrophobic and mix, whereas the oil is hydrophilic. Vinegar and oil are both hydrophobic and mix, whereas the water is hydrophilic. Water and vinegar are both hydrophilic and mix, whereas the oil is hydrophobic. Vinegar dissolves into both the oil and the water in this container.
Answer:
Oil and vinegar separate because it is a suspension
Explanation:
When you let suspensions sit the particles begin to layer out, in the salad dressing the oil layers out on top of the vinegar. The two layers of oil and vinegar don't actually dissolve in each other. The layer with the lower density (oil) floats on top of the layer with a higher density (vinegar)
Water and vinegar are both hydrophilic and mix, whereas the oil is hydrophobic. Oil and vinegar separate because it is a suspension
What is the difference between hydrophilic and hydrophobic molecules ?Hydrophilic molecule are water-loving polar molecule.
They interact with water or they are dissolved in water or water like polar solvent.
For instance, the phospholipid molecules of the plasma membrane has a hydrophilic phosphate group.
Hydrophobic is a water hating substance which can not dissolve in water, but other non-polar solvent.
Thus hydrophobic substances are lipophilic in nature and the hydrophobic solvents are used to separate water-immiscible substances from water.
The layers of oil and vinegar can not dissolve with each other. The oil layer has the lower density floats on top of the layer with a higher density product called vinegar.
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When inspecting containers, what tool is used to determine weld serviceability and the severity of corrosion?
Answer:
Welder’s hammer
Explanation:
Welders hammer is a type of hammer which has two parts in which one is a flat surface and the other is slightly pointed.
It is used in the removal of different types of splatters which are often associated with welding works.
It is also used as a tool during the inspection containers in order to determine weld serviceability and the severity of corrosion.
How to make baking powder
Answer:
nahco3
Explanation:
answer the following question how will you determine if harmful microorganisms are produced in bread or fruit
Answer:
ur dumb
Explanation:
which methods are used for making salts name them and give examples????
Answer:
HAHAH imagine using brainly... just be big brain like me and know all this!!
Explanation:
Answer:
Neutralization method.
Explanation:
NaOH +HCl⇒NaCl+H₂O
Every object in the universe experiences some sort of force. It could be gravity holding Earth in orbit around the sun, or it could be someone sliding a chair across the floor. What best describes a force?
Answer:
See explanation
Explanation:
A force may be defined as a push or pull on an object as a result of its interaction with another object.
Thus, interaction between two objects is only possible because of the action of a force on each of the objects due to interaction between the objects.
For instance, the earth remains in its orbit due to the gravitational force of attraction between the earth and the sun. Many more examples of forces abound in science.
When you freeze water, it turns to ice. What process is this? *
Answer:
Freezing
Explanation:
Freezing is the process in which a liquid changes to a solid. It occurs when a liquid cools to a point at which its particles no longer have enough energy to overcome the force of attraction between them. The freezing point of a substance is the temperature at which it freezes. The freezing point of pure water is 0°C.
Answer:
freezing
Explanation:
Once it gets cold enough (around 32 degrees Fahrenheit), the expanding water molecules begin to form ice crystals. This spreading-out of water molecules as it freezes is why sometimes a bottle full of water will break when you freeze it. The fact that water expands when frozen is also really important to life on Earth.
“The mixture is green in color.” This confirms that the mixture is a.... A) suspension B) solution C) colloid D) this proves nothing
Which molecule has a single covalent bond between its atoms?
[Proton number: He=2, N=7, O=8, F=9]
Answer:
F
Explanation:
Helium (He) has 2 protons. Since the number of protons and electrons are the same, it also has 2 electrons. This means that it's first electronic shell is full and the particle is stable. There is no bonding between these atoms to form molecules.
Nitrogen (N) has 7 protons which is also 7 electrons. After filling the first shell (2), it will still have 5 electrons. The atom will share 3 electrons with another nitrogen atom. This will form 3 covalent bonds.
Oxygen (O) has 8 protons which is also 8 electrons. After filling the first shell (2), it will still have 6 electrons. The atom will share 2 electrons with another oxygen atom. This will form 2 covalent bonds.
Fluorine (F) has 9 protons which is also 9 electrons. After filling the first shell (2), it will still have 7 electrons. The atom will share 1 electron with another fluorine atom. This will form 1 covalent bond aka a single covalent bond.
The boiling point of isopropyl alcohol is 80.3°C. What state of matter is isopropyl alcohol in at 99°C?
plasma
solid
liquid
gas
Someone please help quick!
Answer:
Liquid
Explanation:
Describe the position of each part of an atom in the bohe model
Explanation:
Hey, there!!
The parts are an atom are:
Electrons Protons NeutronsGenerally, Protons and Neutrons lies in the centre of an atom. After that the shells made outer are covered by electrons. We keep 2 electrons in 1st shell, 8 electrons in 2nd, 18 electrons in 3rd shell and so on. The positions of neutron and protons are always in the nucleus and electrons are in the orbits or shell.
Hope it helps....
Displayed formula of 2nonene