Unit 7 Lesson 4: Chemical Reactions

What happens to the atoms in reactants during a chemical reaction?

• The atoms rearrange to form new products.
• The atoms combine without changing their structure.
• The atoms are destroyed during the reaction.
• The atoms remain unchanged throughout the reaction.

Tags

NGSS.HS-PS1-7

What is one way to increase the rate of a chemical reaction?

• Use a non-reactive solvent
• Increase temperature

• Decrease pressure
• Add more products to the reaction

Tags

NGSS.HS-PS1-5

What is one way to increase the rate of a chemical reaction?

• Decrease the pressure
• Don't use a catalyst

• Dilute the reactants
• Increase the concentration

Tags

NGSS.HS-PS1-5

What is the difference between an exothermic and endothermic reaction?

• Exothermic reactions absorb energy; endothermic reactions release energy.
• Exothermic reactions release energy; endothermic reactions absorb energy.
• Exothermic reactions have no energy change; endothermic reactions release energy.
• Exothermic reactions occur only in gases; endothermic reactions occur only in liquids.

Tags

NGSS.HS-PS1-4

The chemical formula for glucose is C₆H₁₂O₆. What are the names of the elements in glucose?

• Carbon, Hydrogen, Oxygen
• Sodium, Chlorine, Oxygen

• Calcium, Hydrogen, Iron

• Nitrogen, Phosphorus, Sulfur

Tags

NGSS.MS-PS1-1

The chemical formula for glucose is C₆H₁₂O₆. How many atoms of carbon are present in a glucose molecule?

• 10
• 8
• 4
• 6

Tags

NGSS.MS-PS1-1

Which of the following does not affect the rate of a chemical change?

• The concentration of the reactants
• The temperature of the reaction
• The color of the reactants
• The presence of a catalyst

Tags

NGSS.HS-PS1-5

What happens to the energy absorbed during an endothermic reaction?

• The energy is released as heat to the surroundings.
• The energy is converted into light energy.
• The energy is stored as potential energy in the reactants.
• The energy is used to break bonds and increase the energy of the products.

Tags

NGSS.HS-PS1-4

What happens to the energy during an exothermic reaction?

• Energy is converted into mass.
• Energy is released into the surroundings.
• Energy remains constant throughout the reaction.
• Energy is absorbed from the surroundings.

Tags

NGSS.HS-PS1-4

What effect does increasing the temperature generally have on the rate of a chemical reaction?

• It stops the reaction completely.

• It decreases the reaction rate.

• It increases the reaction rate.

• It has no effect on the reaction rate.

Tags

NGSS.HS-PS1-5