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goldenfox [79]
3 years ago
5

Which of the following processes involves only physical change? A. decay B. sublimation C. digestion D. combustion

Chemistry
2 answers:
mote1985 [20]3 years ago
8 0

Answer:

\huge \boxed{\mathrm{B. \ sublimation}}

Explanation:

Sublimation is a process that involves only a physical change. Sublimation is a change in a state of matter from solid state to gas state. An example of sublimation can be dry ice, from its solid state to gas state.

grigory [225]3 years ago
5 0
B. Sublimation
Sublimation is the change of a liquid from the liquid state to the gas state. That’s why it’s only involves a physical change. Also, you can go back to the liquid stage.
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Answer:- 448 mL of hydrogen gas are formed.

Solution:- It asks to calculate the volume of hydrogen gas formed in milliliters at STP when 0.020 moles of magnesium reacts with excess HCl acid. The balanced equation is:

Mg+2HCl\rightarrow MgCl_2+H_2(g)

There is 1:1 mol ratio between Mg and hydrogen gas. So, the moles of hydrogen gas is also equals to the moles of Mg reacted.

moles of Hydrogen gas formed = 0.020 mol

At STP, volume of 1 mol of the gas is 22.4 L. We need to calculate the volume of 0.02 moles of hydrogen gas.

0.02mol(\frac{22.4L}{1mol})

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They want answer in mL. So, let's convert L to mL using the conversion formula, 1L = 1000mL

0.448L(\frac{1000mL}{1L})

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So, 0.020 moles of magnesium would produce 448 mL of hydrogen gas at STP on reacting with excess of HCl acid.

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2) For example, a molecule of water will alwys have the same mass ratio of hydrogen atoms to oxygen atoms. That is what permits to obtain the chemical formula of the water molecule as H₂O.


The mass of the two hydrogen atoms will be in a fixed ratio respect to the mass of the oxygen atoms.


Then, if you have one reactant in less proportion than the other, respect to the ratio stated by the chemical formula of water, the former will react completely (it is the limiting reactant) with the corresponding (proportional) mass of the later. Then there will be an excess of the later reactant which will not react (will remain unchanged).


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