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sweet [91]
3 years ago
8

Which statement about subatomic particles is true? (2 points) Protons are the only subatomic particles to have charge. Electrons

are the subatomic particles with the smallest mass. Neutrons orbit the nucleus of the atom. Subatomic particles all have the same mass.
Chemistry
1 answer:
Alona [7]3 years ago
6 0
Protons are not the only subatomic particle that has a charge, electrons do to and they are negatively charged. Neutrons are situated in the nucleus of the atom, which means that they do not orbit it. Subatomic particles have different masses. 

You are then left with Electrons are the subatomic particles with the smallest mass as your answer. 
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You find an unknown substance, which has a density of 10.0 g/ml, and occupies a volume of 80.0 ml. What is the mass of the unkno
Svetlanka [38]

Answer:

Density=mass / volume.

10= mass /80.

mass=10×80.

=800g

4 0
3 years ago
A mixture of gases was found to have a total pressure of 950mmHg. Gas number one has a pressure of 335mmHg. Gas number two has a
jeyben [28]

<u>Answer:</u> The partial pressure of gas number 3 is 159 mmHg

<u>Explanation:</u>

Dalton's law of partial pressure states that the total pressure of the system is equal to the sum of partial pressure of each component present in it.

To calculate the partial pressure of gas number 3, we use the law given by Dalton, which is:

P_T=p_{1}+p_{2}+p_3

We are given:

Total pressure of the tank, P_T = 950 mmHg

Vapor pressure of gas number 1, p_{1} = 335 mmHg

Vapor pressure of gas number 2, p_{2} = 456 mmHg

Putting values in above equation, we get:

950=335+456+p_3\\\\p_{3}=[950-(335+456)]=159mmHg

Hence, the partial pressure of gas number 3 is 159 mmHg

5 0
3 years ago
What’s the percent by mass of carbon in c10h14n2
stepladder [879]

Answer:

the answer is 74.03%

Explanation:

Add all the masses together, M of C = 120.1, M of  H = 14.4 and M of N = 28.02. Adding all those together will give you the mass of the compound, then u divide the mass of carbon by the mass of compound and multiply by 100 to get the percent by mass.

120.1 + 14.4 + 28.02 = 162.26

120.1/162.26 x 100 = 74.03%

3 0
4 years ago
The equilibrium constant, Kp, for the following reaction is 9.52×10-2 at 350 K: CH4(g) + CCl4(g) 2CH2Cl2(g) Calculate the equili
dimaraw [331]

Answer:

pCH4 =  0.9184 atm

pCCl4 = 0.9184 atm

pCH2Cl2 = 0.2832 atm

Explanation:

Step 1: Data given

The equilibrium constant, Kp= 9.52 * 10^-2

Temperature = 350 K

Each have an initial pressure of 1.06 atm

Step 2: The balanced equation

CH4(g) + CCl4(g) ⇆ 2CH2Cl2(g)

Step 3: The pressure at the equilibrium

pCH4 = 1.06 - X atm

pCCl4 = 1.06 - X atm

pCH2Cl2 = 2X

Step 4: Calculate Kp

Kp = (2X)² / (1.06 - X)*(1.06 - X)

9.52 * 10^-2 = 4X² / (1.06 - X)*(1.06 - X)

X = 0.1416

Step 5: Calculate the partial pressure

pCH4 = 1.06 - 0.1416 =  0.9184 atm

pCCl4 = 1.06 - 0.1416 =  0.9184 atm

pCH2Cl2 = 2 * 0.1416 = 0.2832 atm

Kp = (0.2832²) / (0.9184*0.9184)

Kp = 9.52 * 10^-2

pCH4 =  0.9184 atm

pCCl4 = 0.9184 atm

pCH2Cl2 = 0.2832 atm

3 0
3 years ago
Do diastereomers have different physical properties
ANEK [815]

Answer:

Diastereomers can have different physical properties and reactivity. They have different melting points and boiling points and different densities.

7 0
3 years ago
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