Grade 10 · Science · Chemistry

10th grade What makes reactions go faster worksheet

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What makes reactions go faster

Grade 10 Science Worksheet

NameDate

Circle the best answer, or write your answer on the line.

At 10 s a reaction has made 24 mL of gas, and at 20 s it has made 40 mL. What is the average rate between those times, Ari?
At 20 s a reaction has made 40 mL of gas, and at 30 s it has made 50 mL. What is the average rate between those times, Bo?
At 10 s a reaction has made 24 mL of gas, and at 30 s it has made 50 mL. What is the average rate between those times, Esme?
4.
Which change speeds up a reaction, Jun?
- Raising the concentration
- Using one large lump instead of powder
- Lowering the temperature
5.
Why does a higher concentration speed up a reaction, Kira?
- Each of the particles grows larger
- More particles, more collisions
- It lowers the temperature
6.
A catalyst lowers the activation energy. What does it do to ΔH, Luz?
- Nothing: ΔH stays the same
- It flips ΔH's sign
- It makes ΔH twice as big as before
7.
Why don't all collisions between reactant particles cause a reaction, Milo?
- Particles bounce apart before touching
- Light particles are unable to react
- Some lack energy or the right angle
8.
Raising the temperature increases which kind of collision most, Noah?
- Ones between products
- Ones that bounce off
- Ones with enough energy
9.
A rate is found from milliliters of gas and seconds. What are its units, Tala?
- s/mL
- mL/s
- mL × s
10.
The same reaction runs at 20 °C and at 40 °C. Which run's curve rises more steeply, Zee?
- The 20 °C run
- The 40 °C run
- They rise the same

What makes reactions go faster. Every version has 10 questions, and the answer key prints on the second page.

I can explain with collision theory why temperature, concentration, surface area and catalysts change rates.
I can find an average rate from data and between two times on a table.
I can read a rate graph: steep early, flat once reactants run out.
I can choose a change that makes a reaction faster and say what a catalyst does and doesn't change.

Standard: HS-PS1-5

reaction rate: How fast reactants are used or products form

collision theory: Particles react only when they collide with enough energy and the right angle

surface area: The exposed outside of a solid

catalyst: A substance that speeds a reaction and is not used up

enzyme: A catalyst in living things

Your child divided time by amount. A rate is amount per time: mL ÷ s.

Your child used the total since the start. A rate between two times uses the changes: Δamount ÷ Δtime.

Your child kept the first cube's surface area. Cutting it up exposes new faces, so the total area grows.

What is the most common mistake with what makes reactions go faster?

Your child divided time by amount. A rate is amount per time: mL ÷ s.

Are these 10th grade science worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

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