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nata0808 [166]
3 years ago
9

1. Which elements are known as d-block elements?

Chemistry
2 answers:
Usimov [2.4K]3 years ago
8 0

The d-block elements are found in groups 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12 of the periodic table.

So your answer is A) Transition metals

Aleksandr-060686 [28]3 years ago
6 0

Answer:

The answer is Transition metals they are the d-block elements.

Explanation:

The transition metals are called d-block due to these elements have electrons in the outer orbital d.

Orbitals in atoms: The atoms have electrons that are negative charged particles moving around the nucleus. The electrons are distributed in orbitals, each orbital has an energy value and representations with letters the lowest energy orbital is s, then p, d and f.

The d-orbital due to its energetic value can hold up to 10 electrons and these elements are important due to they are required for many organic, inorganic, biological and technological process.

For example: a d-block element is the Iron Fe who has magnetic properties and it is required for the human body to form hemoglobin ( protein needed for oxygen transport in cells.

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geniusboy [140]
- Light energy from sun is converted into electrical energy in a solar cell.
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6 0
3 years ago
Molecules are large atoms true or false
Naddik [55]

Answer:

False

Explanation:

Molecules are not more sizable atoms than the average atom. Molecules are compunds of two different symbolic elements, when you combine then you get a molecule. The answer to your question is false because if they were larger molecules, they would be in object around us but molecules are not in all objects around us.

7 0
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In an experiment, Ann mixes concentrated sulfuric acid with water in a reaction test tube. The walls of the test tube turn hot.W
vladimir2022 [97]
B) Exothermic
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8 0
3 years ago
Read 2 more answers
Dinitrogen tetraoxide, a colorless gas, exists in equilibrium with nitrogen dioxide, a reddish brown gas.
viktelen [127]

Explanation:

N2O4(g)  <----------> 2NO2(g)

Before proceeding,

A chemical equilibrium can be defined as a condition in the course of a reversible chemical reaction in which no net change in the amounts of reactants and products occurs.

Statement 1.

This statement is false. Equilibrium is not about equal concentrations but rather zero change in concentration of the reactants and products.

Statement 2.

This statement is True in chemical equilibrium; the forward and reverse reactions occur at equal rates.

Statement 3.

This statement is False. The rate constant for the forward reaction is not equal to the rate constant of the reverse reaction.

Statement 4.

The concentration of NO2 divided by the concentration of N2O4 is NOT equal to a constant. To obtain a constant value irregardless of the concentrations, the concentration of NO2 must be squared. This comes from the stoichiometry of the reaction

Kc= [NO2]2 / [N2O4]

This statement is false.

3 0
3 years ago
2 hydrogen atoms; 3 helium atoms; 5 oxygen atoms; 6 iron atoms
lidiya [134]

Answer:

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