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3 years ago

Use this diagram to determine which of the following statements is true.

Chemistry

1 answer:

natima [27]3 years ago

3 0

Answer:

D. Catalysts speed up the rate of reactions by lowering the amount of energy required for the reaction to proceed.

Explanation:

A catalyst is a substance that:

speeds up the rate of a reaction .

does not alter the products of the reaction .

is unchanged chemically and in mass at the end of the reaction.

A catalyst provides an alternative reaction pathway that has a lower activation energy than the uncatalyzed reaction.

The figure shows how the energy of the reactants and products change during a reaction.

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To grow or reach the next stage in a life cycle is to develop.

gogolik [260]

Answer:

It's obviously true

Explanation:

As we have evolved over the years we have become more advanced

5 0

3 years ago

How would having too much sample in the melting point tube most likely affect the melting point measurement? Select the correct

oksano4ka [1.4K]

Answer:

2-4 mm height of capillary tube.

Explanation:

Sample should be around 2-4 mm in height.

It should be packed well so that it does not have air packets that caues the lowering of melting point.

If you take greater amount, then there will be needed more heat, resulting a wide range of melting point.

7 0

3 years ago

24 g of magnesium were burned in oxygen. The compound formed had a mass of 40 g. Explain why the mass had gone up.

DIA [1.3K]

Answer :

According to the law of conservation of mass, the mass of reactants must be equal to the mass of products.

The balanced chemical reaction is,

$Mg+\frac{1}{2}O_2\rightarrow MgO$

As we know that the molar mass of magnesium is 24 g/mole, the molar mass of $O_2$ is 32 g/mole and the molar mass of magnesium oxide is 40 g/mole.

From the given balanced reaction, we conclude that

As, 1 mole of magnesium react $\frac{1}{2}$ mole of oxygen to give 1 mole of magnesium oxide.

So, the mass of Mg is 24 g, the mass of $O_2=\frac{1}{2}\times 32=16g$ and the mass of MgO is 40 g.

That means 24 g of Mg react with 16 g $O_2$ to give 40 g of MgO.

8 0

3 years ago

Robert has pure samples of both D-ribose and D-arabinose, but he forgot to label them. He only has some nitric acid, the reagent

Sauron [17]

Answer:

Following are the responses to the given question:

Explanation:

Since HN03 is an oxidation substance D-ribose u.ith oxidized to form in rubric acid Ribose is chiral, but rubric acid is achiral because of its symmetry mirror level, Hence no infrared roster in the sample holder is observed.

Please find the attached file.

D-Arabinose, on either hand, gives optical aldaric acid with such a net optical rotation observed inside the polarimeter for diagnosis with HN03.

4 0

3 years ago

Describe heat transfer of Getting hot sitting outside in the sun.

nlexa [21]

Answer:

RADIATION is the transfer of Heat energy through space by Electromagnetic Radiation. Most of the electromagnetic radiation that comes to the earth from the Sun is invisible.

8 0

2 years ago