Chemical Reactions Amplify Review

What is a reactant in a chemical reaction?

• A substance that is produced during a chemical reaction.

• A substance that undergoes change during a chemical reaction.

• A catalyst that speeds up the reaction.

• A byproduct that remains unchanged.

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What happens to the properties of substances when atoms are rearranged during a chemical reaction?

• The properties of the substances remain unchanged.

• The properties of the substances can change due to the rearrangement of atoms.

• The substances become completely different materials.

• The properties of the substances are enhanced without any change.

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What is a molecule? Give an example.

• A group of atoms bonded together, such as H2O.

• A single atom, like Helium (He).

• A type of chemical reaction, like combustion.

• A mixture of different substances, like air.

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What is an example of a chemical reaction that involves a color change?

• The reaction between vinegar and baking soda, which produces carbon dioxide gas and causes bubbling.

• The reaction of iron with oxygen to form rust, which changes color from silver to reddish-brown.

• The reaction of baking soda with lemon juice, which produces a colorless solution.

• The reaction of hydrochloric acid with sodium hydroxide, which produces a clear solution.

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How can you determine if a chemical reaction has occurred?

• By measuring the pH level of the solution.

• By observing changes in properties such as color, temperature, and state of matter.

• By checking the mass of the reactants before and after the reaction.

• By waiting for a specific time period after mixing the reactants.

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What is the significance of repeating groups of atoms in determining the properties of a substance?

• They have no effect on the properties of a substance.

• They determine the physical and chemical properties of a substance.

• They only affect the color of the substance.

• They influence the temperature at which a substance melts.

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What is a product in a chemical reaction?

• A substance that is formed as a result of a chemical reaction.

• A substance that is consumed during a chemical reaction.

• A catalyst that speeds up the reaction.

• A mixture of reactants before the reaction occurs.

Will the properties of two samples made of the same repeating groups of atoms be the same or different?

• The properties will be different because the samples are from different sources.

• The properties will be the same because the repeating groups of atoms that make up the two samples are the same.

• The properties will be similar but not identical due to environmental factors.

• The properties will vary based on the size of the samples.

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What role do temperature and melting point play in chemical reactions?

• They have no effect on chemical reactions.

• They can influence the rate of a chemical reaction and the state of the substances involved.

• They only affect the color of the substances.

• They determine the smell of the substances.

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How do chemists analyze the results of a chemical reaction?

• By examining the properties of the starting and ending substances, including changes in color, state, and temperature.

• By measuring the mass of the reactants and products only.

• By observing the reaction without any measurements.

• By conducting the reaction in a vacuum to avoid contamination.

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