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What is the result of adding the atomic numbers of Hydrogen and Helium?

• 3

• 4

• 5

• 6

In a chemical reaction, if you add more reactants, what generally happens to the rate of reaction?

• It increases

• It decreases

• It stays the same

• It becomes zero

Tags

NGSS.HS-PS1-5

When you add heat to a solid, what is the process called when it turns into a liquid?

• Sublimation

• Condensation

• Melting

• Freezing

Tags

NGSS.MS-PS1-4

What is the sum of the coefficients in the balanced equation @@ ext{C}_2 ext{H}_4 + 3 ext{O}_2 ightarrow 2 ext{CO}_2 + 2 ext{H}_2 ext{O}@@?

• 8

• 9

• 10

• 11

Tags

NGSS.MS-PS1-5

If you add a catalyst to a chemical reaction, what effect does it have on the activation energy?

• Increases it

• Decreases it

• No effect

• Doubles it

What happens to the boiling point of water when you add salt to it?

• It increases

• It decreases

• It stays the same

• It becomes zero

Tags

NGSS.MS-PS3-4

In physics, what is the result of adding two vectors that are in opposite directions?

• A larger vector

• A smaller vector

• Zero vector

• A perpendicular vector

What is the result of adding the pH values of a neutral solution and an acidic solution?

• Always neutral

• Always acidic

• Always basic

• Depends on the solutions

When you add more solute to a saturated solution, what happens?

• It dissolves

• It precipitates

• It evaporates

• It reacts

What is the result of adding the mass numbers of two isotopes of the same element?

• A new element

• An average mass number

• A compound

• A molecule