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Wewaii [24]
3 years ago
13

Describe the difference between a chemical reaction and a physical change.

Chemistry
1 answer:
GREYUIT [131]3 years ago
5 0
A chemical change results from a chemical reaction, while a physical change is when matter changes forms but not chemical identity.


Examples of chemical changes are burning, cooking, rusting, and rotting.

Examples of physical changes are boiling, melting, freezing, and shredding.
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0.446 g of hydrogen gas fills a 5.0 L bag determine the density of hydrogen
Oduvanchick [21]

The density of hydrogen : ρ = 0.0892 g/L

<h3>Further explanation</h3>

Given

mass of Hydrogen : 0.446 g

Volume = 5 L

Required

The density

Solution

Density is a quantity derived from the mass and volume  

Density is the ratio of mass per unit volume  

The unit of density can be expressed in g/cm³, kg/m³, or g/L

Density formula:  

\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}

Input the value :

ρ = m : V

ρ = 0.446 g : 5 L

ρ = 0.0892 g/L

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FromTheMoon [43]

Answer:

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Explanation:

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We must put energy into an electron to pull it away from the attraction of a nucleus.

So, electrons that are further from the nucleus are at higher energy levels.

6 0
3 years ago
Reducing the volume of a contained gas by one third, while holding temperature constant, causes pressure to A. be decreased by t
Nostrana [21]
Reducing the volume of contained gas by one third, while holding temperature constant, causes pressure to D. be increased by one third
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Look at the diagram. What number needs to be added to balance the equation?
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Answer:

2

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