PS1.B Quiz

What is the law of conservation of mass?

• Mass is created during chemical reactions.

• Mass is destroyed during chemical reactions.

• Mass is neither created nor destroyed in chemical reactions.

• Mass is converted into energy in chemical reactions.

Tags

NGSS.HS-PS1-7

What is the main evidence that a chemical reaction has occurred?

• A change in state, such as melting.

• The formation of new substances with different properties.

• An increase in temperature.

• A decrease in mass of the reactants.

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NGSS.MS-PS1-2

Why is balancing chemical equations important?

• To predict the rate of reaction.

• To satisfy the law of conservation of mass.

• To show the physical states of the reactants and products.

• To identify the catalyst in the reaction.

Tags

NGSS.HS-PS1-7

In a reaction between hydrogen gas (H₂) and oxygen gas (O₂) to form water (H₂O), which type of reaction occurs?

• Decomposition

• Synthesis

• Combustion

• Single replacement

What happens to bonds during a chemical reaction?

• Old bonds are broken, and new bonds are formed.

• No bonds are broken, but new ones are formed.

• All bonds remain unchanged.

• Only ionic bonds are broken.

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NGSS.HS-PS1-4

NGSS.HS-PS1-7

Which type of chemical reaction involves one compound breaking into two or more products?

• Synthesis

• Decomposition

• Double replacement

• Combustion

Tags

NGSS.MS-PS1-5

When two solutions are mixed and a precipitate forms, what type of reaction has likely occurred?

• Combustion

• Synthesis

• Precipitation (double replacement)

• Decomposition

Which of the following represents an exothermic reaction?

• Ice melting into water

• A reaction that absorbs heat from its surroundings

• Combustion of methane producing heat and light

• Photosynthesis in plants

Tags

NGSS.HS-PS1-4

How can increasing the concentration of reactants affect a chemical reaction?

• It decreases the reaction rate by reducing collisions.

• It increases the reaction rate by causing more collisions.

• It has no effect on the reaction rate.

• It changes the products formed.

Tags

NGSS.HS-PS1-5

What role does a catalyst play in a chemical reaction?

• It is consumed during the reaction.

• It lowers the activation energy required for the reaction.

• It increases the energy of the reactants.

• It shifts the equilibrium of the reaction.