Speed and Velocity — Cumulative exam

Question 1

During a camping trip, Sierra collected dry branches and broke them into smaller pieces. She then placed the sticks in a fire pit and used a match to light the sticks on fire. Next, she propped a metal pan of water over the fire and heated it until the water boiled.

Revolt · Accepted Answer

physical changes: breaking sticks, boiling waterchemical change: lighting the fire

Question 2

The graph indicates Linda’s walk.

Revolt · Accepted Answer

Linda started out moving, and then stopped moving after 6 seconds.

Question 3

How does Bohr’s model of the atom compare with Thomson’s model?

Revolt · Accepted Answer

They both describe atoms as being made up of positive and negative matter.

Question 4

Lava is rock that has undergone a physical change and has liquefied. What is known about this change?

Revolt · Accepted Answer

The lava can cool back into rock.

Question 5

Which type of reaction is C12H22O11 → 12C + 11H2O?

Revolt · Accepted Answer

decomposition

Question 6

What did Thomson’s model of the atom include that Dalton’s model did not have?

Revolt · Accepted Answer

smaller particles

Question 7

The charges for four ions are sodium (Na) +1, calcium (Ca) +2, fluorine (F) –1, and sulfur (S) –2. Which would be an ionic bond that could form from any of these ions?

Revolt · Accepted Answer

Na2S

Question 8

In the product 6O2, what does the coefficient mean?

Revolt · Accepted Answer

There are 6 molecules of O2.

Speed and Velocity — Cumulative exam Answers

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