HS PS

The rate of a chemical reaction characterizes

• change in the quantities of substances per unit of time in a unit of volume or unit of area;

• the time required for a chemical reaction to complete;

• the number of particles of a substance that entered into a chemical reaction;

• the movement of molecules or ions of reacting substances

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NGSS.HS-PS1-5

For the chemical process FeO _(s) + H_{2 (g)} = Fe _(s) + H₂O , indicate how many times will the rate of the direct reaction decrease when the hydrogen concentration decreases by 3 times?

• 3 times;

• 6 times;

• 9 times;

• 27 times.

Tags

NGSS.HS-PS1-5

How many times will the rate of reaction
change if the concentration of substance A is reduced by 2 times?   2A + B = 2C

• will increase 4 times;

• will decrease by 4 times;

• will increase 2 times;

• will decrease by 2 times.

Tags

NGSS.HS-PS1-5

The rate of the direct reaction N ₂ + 3H ₂ = 2NH ₃ + Q increases by …

• increasing nitrogen concentration;

• decreasing nitrogen concentration;

• increasing ammonia concentration;

• decreasing ammonia concentration

Tags

NGSS.HS-PS1-5

How will the rate of the direct reaction MgCO ₃ = MgO + CO₂ be affected by increasing the pressure by 3 times?

• speed will increase 3 times;

• the speed will decrease by 9 times;

• the speed will decrease by 3 times;

• the speed will not change.

How will the rate of the reaction SrO + CO₂ = SrCO₃ be affected by doubling the pressure of carbon dioxide?

• speed will increase 2 times;

• the speed will decrease by 4 times;

• the speed will decrease by 2 times;

• the speed will not change.

Tags

NGSS.HS-PS1-5

If the pressure is doubled, the reaction rate will not increase:

• H ₂ + I ₂ = 2HI;

• C + O ₂ = CO₂ ;

• 2NH ₃ = N₂ + 3H₂ ;

• Fe + CuSO₄ = Cu + FeSO₄ .

Tags

NGSS.HS-PS1-5

The interaction of which pair of substances will proceed at a faster rate if it is known that the concentration of acid solutions is the same in all cases?

• Pb and HCl ;

• Fe and HCl ;

• Zn and HCl ;

• Mg and HCl .

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NGSS.HS-PS1-5

How many times does the rate of a chemical reaction decrease when the temperature decreases from 20 ^o C to 0 ^o C, if the temperature coefficient is 2?

• 2 times;

• 4 times;

• 8 times;

• 20 times.

Tags

NGSS.HS-PS1-5

When the temperature increases from 20 ^o C to 50 ^o C, the reaction rate increases 8 times. What is the temperature coefficient of the reaction?

• 8

• 4

• 3

• 2

Tags

NGSS.HS-PS1-5