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3 years ago

The following phase diagram shows how a catalyst affected the rate of a reaction.

Chemistry

2 answers:

Maslowich3 years ago

8 0

The correct answer is C

Oduvanchick [21]3 years ago

5 0

Answer:

The correct answer is "The catalyst decreased the activation energy of the reactants."

Explanation:

Activation energy is the minimum energy required to start a reaction. A catalyst lowers the activation energy of a reaction. Here the catalyst lowers the activation energy of the reactant, thus making it easier to start to the reaction. In the absence of a catalyst the activation energy of the reactant will be higher.

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What is the si unit for heat

geniusboy [140]

(J) unit joule is the standard unit of heat (energy)

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3 years ago

Although not usually soluble in plain water, an amphoteric oxide or hydroxide is: 1. soluble in neutral solutions. 2. soluble in

Aleksandr [31]

Answer:

The correct option is: 4. soluble in both acidic and basic solutions

Explanation:

Oxide is a chemical compound formed by an element with oxygen. In such compounds, the oxygen is generally present in the -2 oxidation state.

Whereas, hydroxide is a chemical compound formed by an element with hydroxyl group (-OH).

Oxides and hydroxides of some elements are amphoteric in nature. Such compounds can behave as an acid in basic medium and behave as a base in acidic medium.

Therefore, amphoteric oxides and hydroxides are soluble in both acidic and basic solutions.

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3 years ago

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nikitadnepr [17]

Formula of density is mass divided by volume.

8 0

3 years ago

4. Greta passed a comb through her hair several times. She then placed the comb next to a stream of water flowing from a faucet.

Taya2010 [7]

the correct answer is B

6 0

3 years ago

If nutrients move into and out of ecosystems they can do so from various sources. Select which of the following is an example of

Valentin [98]

Answer:

Options (A), (B) and (C)

Explanation:

In an ecosystem, the transfer of nutrients takes place from one place o another. This input and output of nutrients continuously takes place in the ecosystem.

The rainwater is also essential as it carries a certain amount of valuable nutrients such as calcium, fluoride, magnesium, and iron that are mixed with water, and this enriches the fertility of the soil and the water is taken up by the roots of the plants for the growth and expansion of plants.

The nitrogen-fixing bacteria refers to those micro-organisms that are present in the soil and helps in the conversion of the atmospheric nitrogen into nitrogen compounds, which are helpful for the enhancement of the soil fertility.

Chemical weathering usually refers to the process by which the rocks disintegrates due to the effect of chemical reactions. The micro-organisms and the plant roots release some acids sometimes that react with the rocks and help in breakdown releasing the nutrients that are stored in the rocks. This eventually mixes up with the soil and increases the quality of the soil.

Thus, the correct answers are options (A), (B) and (C).

7 0

3 years ago