What is the correct and technical definition of an element?

1 answer:

8 0

1) In chemistry and physics, an element is a substance that cannot be broken down into simpler components by any non-nuclear chemical reaction. An element is uniquely determined by the number of protons in the nuclei of its atoms.- from google

hope this helps :) sorry if it doesn't

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When hydronium and hydroxide neutralize each other as they react in equal amounts, what is true of their molarities? A. Their mo

Fed [463]

A. Their molarities are equal.

H₃O⁺ + OH⁻ → 2H₂O

1:1

8 0

3 years ago

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What is starch test?

Fed [463]

Answer:

The starch test also known as the iodine test is used to test for the presence of starch.

Sorry if this isn’t detailed enough. You can go on google/wikipedia and find much more detail if necessary. ^-^

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3 years ago

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What products result from mixing aqueous solutions of Cr(NO3)2(aq) and NaOH(aq)? Question 10 options: Cr(OH)2(s), Na+(aq), and N

Alecsey [184]

Answer:

Cr(OH)2(s), Na+(aq), and NO3−(aq)

Explanation:

Let is consider the molecular equation;

2NaOH(aq) + Cr(NO3)2(aq) -----> 2NaNO3(aq) + Cr(OH)2(s)

This is a double displacement or double replacement reaction. The reacting species exchange their partners. We can see here that both the sodium ion and chromium II ion both exchanged partners and picked up each others partners in the product.

Sodium ions and nitrate ions now remain in the solution while chromium II hydroxide which is insoluble is precipitated out of the solution as a solid hence the answer.

4 0

4 years ago

Activation energy Group of answer choices is only required in catabolic reactions that release energy. is not required at all wh

daser333 [38]

Answer:

is used to break reactant bonds and/or make new product bonds.

Explanation:

The correct answer would be that activation energy is used to break reactant bonds and/or make new product bonds.

The activation energy is the minimum energy that must be overcome by the reactants in a reaction in other to become products. In order for products to be formed, the bonds between reactants must be broken and new ones must be formed to arrive at the products. In other words, the activation energy can be seen as the energy required to break the bonds between reactants and form the bonds between products during the course of a reaction.

Activation energy is required even in the presence of enzymes. The latter only catalyzes reactions by lowering the minimum energy required to break the bonds between reactants and form new ones between products.

5 0

3 years ago

In which reaction does the oxidation number of hydrogen change? In which reaction does the oxidation number of hydrogen change?

dedylja [7]

Answer: The correct answer is $2Na(s)+2H_2O(l)\rightarrow 2NaOH(aq.)+H_2(g)$

Explanation:

Oxidation number is defined as the number which is given to an atom when it looses or gains electron. When an atom looses electron, it attains a positive oxidation state. When an atom gains electron, it attains a negative oxidation state.

Oxidation state of the atoms in their elemental state is considered as 0. Hydrogen is present as gaseous state.

For the given chemical reactions:

Reaction 1: $2HClO_4(aq.)+CaCO_3(s)\rightarrow Ca(ClO_4)_2(aq.)+H_2O(l)+CO_2 (g)$