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Dafna1 [17]
4 years ago
10

What was one main point of Dalton’s atomic theory?

Chemistry
1 answer:
Cerrena [4.2K]4 years ago
8 0
The answer to this question is C, I hope this helps you!
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CHEMISTRY HELP!:
Mamont248 [21]
1 mol of anything has 6.02 * 10^23 items.
4 mol has 4 times as much
C: Answer <<<<< =========
5 0
3 years ago
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Predict which of the following changes will cause the volume of the balloon to increase or decrease assuming that the temperatur
IrinaVladis [17]

Answer:

1. a

2. a

3. b

4. c

Explanation:

The STP is the Standard conditions of Temperature and Pressure, in these conditions, T = 0°C and P = 1 atm. By the ideal gas law,

PV = nRT

Where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature.

We can observe that pressure and volume are indirect proportional, so when one increase, the other decrease. so:

1. The pressure decreases from 1.15 atm to STP, 1 atm, thus the volume increases.

2. The pressure decreases from STP, 1 atm, to 0.5 atm, thus the volume increases.

3. The pressure increases from STP, 1 atm, to 1.25 atm, thus the volume decreases.

4. The pressure remains constant at 1 atm, thus the volume is unchanged.

7 0
3 years ago
The half-life of plutonium-238 is 87.7 years.
Margaret [11]

Answer:

263.1 is exactly three half-life, so the remaining portion is (1/2 x 1/2 x 1/2) of the original sample. That's 1/8 which is 12.5%

8 0
3 years ago
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The formation of a plaque and halitosis can be avoided by brushing and flossing at least :
Jet001 [13]

Answer:

at least 3 times a day

Explanation:

7 0
3 years ago
Balance the equations by inserting coefficients as needed.<br> CaH₂ + H₂O Ca(OH)₂ + H₂
dmitriy555 [2]

The balanced equation is CaH_{2}  + 2 H_{2} O = Ca(OH)_{2}  + 2 H_{2}.

The above equation is a redox reaction. A chemical equation is said to be balanced when the total mass of atoms on the reactant and product side are equal. This means that the number of atoms on both side must also be equal.

We have, CaH_{2}  + H_{2} O = Ca(OH)_{2}  +  H_{2}.

The number of atoms of Calcium (one on both sides) and Hydrogen(four on both sides) are equal. Whereas, there are 2 atoms of Oxygen on the right-hand side and only  1 atom of Oxygen on the left-hand side. So, we can put the coefficient of 2 on the molecule that has Oxygen on the left-hand side to balance them out. i.e.,

CaH_{2}  + 2H_{2} O = Ca(OH)_{2}  +  H_{2}

Now, there are 6 atoms of Hydrogen on the left-hand side but only 4 on the right-hand side. To balance this, we can put the coefficient of 2 on the Hydrogen molecule on the right-hand side.

Thus, we get the final balanced equation as :CaH_{2}  + 2 H_{2} O = Ca(OH)_{2}  + 2 H_{2}

To read about balancing chemical equations visit brainly.com/question/11904811

4 0
2 years ago
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