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morpeh [17]
2 years ago
15

Individual atoms of each element all have an equal number of protons and neutrons. Only the number of electrons may vary. t or f

Chemistry
2 answers:
Anit [1.1K]2 years ago
6 0

Proton and Neutron numbers within an atom cannot change, however, the electron number may change and form an ion. The answer is True

Semenov [28]2 years ago
3 0
Cant help sorry i did it a long time ago
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At a pressure of 650 kpa 2.2L of hydrogen is used to fill a balloon to a final pressure of 115 kpa. What's the balloons volume?
Alborosie

Answer:

V₂ = 12.43 L

Explanation:

Given data:

Initial pressure = 650 KPa

Initial volume = 2.2 L

Final pressure = 115 KPa

Final volume = ?

Solution:

The given problem will be solved through the Boyles law,

"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"

Mathematical expression:

P₁V₁ = P₂V₂

P₁ = Initial pressure

V₁ = initial volume

P₂ = final pressure

V₂ = final volume  

Now we will put the values in formula,

P₁V₁ = P₂V₂

650 KPa ×2.2 L = 115 KPa × V₂

V₂ = 1430 KPa. L/ 115 KPa

V₂ = 12.43 L

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2 years ago
60.0 g of NH Cl are dissolved in 100 grams of water at 60.0° C. This solution is
Sidana [21]

Answer:

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What is the mass of 2.49 cm of aluminum? The density of aluminum is 2.70 g/cm.
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Answer:

6.723

Explanation:

2.49*2.70

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Describe how you could prove that a bicycle is matter
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Answer:

Explanation:

Matter is anything that has weight and occupies space.

To prove that a bicycle is a matter, we need to show that it has weight and will occupy space.

When you put the bicycle on a weighing scale, you will see the weight of the bicycle. This a proof that bicycle is a matter.

To show that the bicycle can occupy space, place the device in a tank full of water. From the tank, the bicycle will displace some water. Substances that cannot occupy space will not behave in such manner.

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