Chemical Reactions Everywhere

What is evidence of a chemical reaction?

• Color change, gas production, temperature change, and formation of a precipitate.

• Change in mass, evaporation of liquid, mixing of solids, and color retention.

• Absence of odor, solidification of liquids, temperature stability, and color fading.

• Formation of bubbles, melting of solids, color fading, and change in pH.

Tags

NGSS.MS-PS1-2

Can chemical reactions happen anywhere?

• Yes, chemical reactions can occur in various environments, including in the lab, in nature, and in our bodies.

• No, chemical reactions only happen in laboratories.

• Chemical reactions can only occur in extreme conditions.

• Chemical reactions are limited to industrial settings.

What happens during a chemical reaction?

• New substances are formed, often involving the rearrangement of atoms.

• Atoms are destroyed and new ones are created.

• The temperature of the substances decreases significantly.

• The mass of the substances increases due to energy absorption.

Tags

NGSS.MS-PS1-2

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What is a chemical reaction?

• A process where substances (reactants) change into new substances (products) with different properties.

• A method of separating mixtures into their individual components.

• A technique used to measure the temperature of a substance.

• A way to combine different elements without changing their properties.

Tags

NGSS.MS-PS1-2

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What is NOT evidence of a chemical reaction?

• Melting is not evidence of a chemical reaction.

• Color change is evidence of a chemical reaction.

• Gas production is evidence of a chemical reaction.

• Temperature change is evidence of a chemical reaction.

Tags

NGSS.MS-PS1-2

What are the main types of chemical reactions?

• Synthesis, decomposition, single replacement, double replacement, and combustion.

• Oxidation, reduction, hydrolysis, and polymerization.

• Evaporation, condensation, sublimation, and deposition.

• Neutralization, precipitation, and ionization.

Tags

NGSS.MS-PS1-5

What is an exothermic reaction?

• A reaction that absorbs heat from its surroundings.

• A reaction that releases heat to its surroundings.

• A reaction that occurs only in the presence of a catalyst.

• A reaction that requires energy input to proceed.

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NGSS.MS-PS1-4

What is an endothermic reaction?

• A reaction that releases heat to its surroundings.

• A reaction that absorbs heat from its surroundings.

• A reaction that occurs spontaneously without energy input.

• A reaction that produces light as a byproduct.

Tags

NGSS.MS-PS1-4

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What is the law of conservation of mass?

• In a chemical reaction, mass is neither created nor destroyed; it remains constant.

• Mass can be created or destroyed in a chemical reaction.

• The total mass of products is always greater than the total mass of reactants.

• Mass is only conserved in physical changes, not in chemical reactions.

Tags

NGSS.MS-PS1-5

What is a reactant?

• A substance that undergoes change in a chemical reaction.

• A product formed after a chemical reaction.

• A catalyst that speeds up a chemical reaction.

• A mixture of two or more substances.

Tags

NGSS.MS-PS1-5