ICP_S2: Unit 8 Review

When Mason strikes a match to light a candle, what is this an example of?

• an endothermic reaction

• providing activation energy to a chemical reaction

• providing activation energy to a physical reaction

Michael places an ice pack on his arm. The ice pack feels cold because it absorbs energy from his skin. How is this reaction described when a chemical reaction uses (absorbs) up energy?

• limiting

• endothermic

• a product

• exothermic

Tags

NGSS.MS-PS1-4

During a baking session, Aria mixes flour and sugar to make cookies. If she runs out of flour before all the sugar is used, which substance is completely consumed in the process?

• limiting reactant

• product

• limiting product

• reactant

Anika is conducting an experiment in her science class to produce water by combining hydrogen and oxygen gases. Which equation shows a balanced reaction for her experiment?

• 2H2 + O2 → 2H2O

• H2 + O2 → H2O

• 4H2 + O2 → H2O + O

• H2 + O2 → H2O + O2

Tags

NGSS.MS-PS1-5

Arjun is conducting an experiment in his chemistry lab where he burns methane (CH4) in oxygen (O2) to produce carbon dioxide (CO2) and water (H2O). He writes the equation: CH4 + O2 → CO2 + 2 H2O. What needs to be done to balance this equation?

• Do nothing (equation is balanced).

• Add coefficient 2 to O2 on the left side of the equation.

• Remove coefficient 2 in front of H2O on the right side of the equation.

• Change O2 to O4 on the left side of the equation.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

When Mason burns methanol (CH3OH) in the presence of oxygen (O2), the reaction produces carbon dioxide (CO2), water (H2O), and heat. Which type of reaction is this an example of?

• substitution

• endothermic

• synthesis

• combustion

Abigail takes an ice cube from the freezer and watches it melt on the kitchen counter. Why is ice melting not a chemical change?

• A precipitate is not present.

• There is increased activation energy.

• A new reactant is formed.

• A new substance is not formed.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

James is conducting a chemical experiment. He notices that after the reaction, the number of atoms of each element in the products equals the number of atoms of each element in the reactants. How is the equation described?

• spontaneous

• an acid-base reaction

• balanced

• non spontaneous

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

When Olivia burns a piece of wood in a campfire, the reaction is exothermic and __________ energy. Which word best completes this statement?

• releases

• absorbs

• limits

• stores

Tags

NGSS.HS-PS1-4

Ava leaves a bowl of iron nails outside, and over time, they start to rust without her doing anything to them. Which type of reaction is happening without being started by some outside force?

• spontaneous reaction

• combustion reaction

• activation energy reaction

• physical reaction