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How do catalysts affect a chemical reaction?

lower activation energy
lose activation energy
increase activation energy
provide activation energy

19 answers

Catalysts affect a chemical reaction primarily by lowering the activation energy required for the reaction to occur. This means that the reaction can proceed more easily and often at a faster rate without being consumed in the process.

So, the correct answer is lower activation energy.

To clarify the other options:

  • Catalysts do not lose activation energy; they facilitate the reaction without being depleted themselves.
  • Catalysts do not increase activation energy; their purpose is to reduce it.
  • Catalysts do not provide activation energy; they simply make it easier for the reaction to take place by lowering the energy barrier.
How do catalysts affect a chemical reaction?

lower activation energy
lose activation energy
increase activation energy
provide activation energy

The correct answer is lower activation energy.

Catalysts are substances that speed up chemical reactions by lowering the activation energy required for the reaction to proceed. They help to make the pathway for the reaction more favorable, allowing reactants to be converted to products more easily and often more quickly, without being consumed in the process. The other options are not accurate in describing the role of catalysts in chemical reactions.

What happens during rusting of an iron nail? (1 point)
Sulfur and oxygen combine to form a sulfur dioxide coating.
Sulfur, iron, and oxygen combine to form iron sulfoxide.
Iron and sulfur combine to form iron sulfide.
Iron and oxygen combine to form iron oxide.

During the rusting of an iron nail, iron and oxygen combine to form iron oxide.

This process occurs when iron reacts with oxygen in the presence of moisture, leading to the formation of rust, which is typically iron (III) oxide (Fe₂O₃) and can also include hydrated forms. Therefore, the correct answer is:

Iron and oxygen combine to form iron oxide.

What happens during rusting of an iron nail? (1 point)

Sulfur and oxygen combine to form a sulfur dioxide coating.
Sulfur, iron, and oxygen combine to form iron sulfoxide.
Iron and sulfur combine to form iron sulfide.
Iron and oxygen combine to form iron oxide.

During the rusting of an iron nail, the correct process is:

Iron and oxygen combine to form iron oxide.

Rust is primarily composed of iron(III) oxide (Fe₂O₃), often in the presence of water and moisture from the environment. The other options listed do not accurately describe the rusting process.

What does the forward arrow in a chemical equation mean?
The reaction proceeds slowly.
The reaction is reversible.
The reaction yields something.
The reaction proceeds quickly

In a chemical equation, the forward arrow (→) means the reaction yields something.

It indicates the direction of the reaction, showing that reactants on the left side are transformed into products on the right side. So, the correct interpretation is that the reaction produces or yields the substances on the product side.

To clarify the other options:

  • A forward arrow does not indicate the speed of the reaction (slow or quick).
  • Reversible reactions are typically represented with a double arrow (⇌) to indicate that the reaction can proceed in both directions.
What does the forward arrow in a chemical equation mean?

The reaction proceeds slowly.
The reaction is reversible.
The reaction yields something.
The reaction proceeds quickly

The correct answer is The reaction yields something.

The forward arrow (→) in a chemical equation indicates that the reactants are converting into products, indicating the direction of the reaction and that products are formed as a result of the reaction.

The other options do not accurately describe the meaning of the forward arrow in the context of a chemical equation.

Which kind of reaction is photosynthesis?
exothermic
temperature-independent
light-independent
endothermic

Photosynthesis is considered an endothermic reaction.

In photosynthesis, plants absorb sunlight (light energy) to convert carbon dioxide and water into glucose and oxygen. This process requires an input of energy (from sunlight), which is characteristic of endothermic reactions.

To clarify the other options:

  • Exothermic reactions release energy, which is not the case for photosynthesis.
  • Temperature-independent is not a relevant classification for photosynthesis, as the rate of photosynthesis can be affected by temperature.
  • Light-independent reactions (also known as the Calvin cycle) occur after the light-dependent reactions but referring to photosynthesis as a whole, it relies on light energy.

Thus, the best classification for photosynthesis is endothermic.

Which kind of reaction is photosynthesis?

exothermic
temperature-independent
light-independent
endothermic

Photosynthesis is considered an endothermic reaction.

In this process, plants absorb light energy from the sun to convert carbon dioxide and water into glucose and oxygen. This absorption of energy characterizes an endothermic reaction, as it requires energy input.

To summarize:

  • Exothermic: Releases energy (not applicable to photosynthesis).
  • Temperature-independent: Not a relevant classification; photosynthesis can be affected by temperature.
  • Light-independent: While there are light-independent steps (like the Calvin cycle), photosynthesis as a whole relies on light energy.

Thus, the correct answer is endothermic.

Which option describes an enzyme? (1 point)
a specialized carbohydrate that helps chemical reactions to occur
a specialized protein that changes during a chemical reaction
a specialized carbohydrate that changes during a chemical reaction
a specialized protein that helps chemical reactions to occur

The correct option that describes an enzyme is:

a specialized protein that helps chemical reactions to occur.

Enzymes are biological catalysts that accelerate chemical reactions in living organisms. They are typically made of proteins and work by lowering the activation energy needed for reactions to occur, facilitating various biochemical processes.

Which option describes an enzyme? (1 point)

a specialized carbohydrate that helps chemical reactions to occur
a specialized protein that changes during a chemical reaction
a specialized carbohydrate that changes during a chemical reaction
a specialized protein that helps chemical reactions to occur

The correct option that describes an enzyme is:

a specialized protein that helps chemical reactions to occur.

Enzymes are typically proteins that act as catalysts in biochemical reactions, speeding up the reactions without being consumed or permanently altered in the process.