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fomenos
3 years ago
10

The number 0.000402 expressed in scientific notation is

Chemistry
1 answer:
goldfiish [28.3K]3 years ago
3 0

Answer:

hope its help you

Explanation:

4.02 x 10-4

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cytoplasm is found in both plant and animal cell.

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Correct answer gets brainliest
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Chlorine (cl) has an atomic number of 17. it often forms an ion by gaining 1 electron. what would its charge be?
Aliun [14]

Answer:

= -1

Explanation:

  • Chlorine belongs to the halogen group in the periodic table. It has an atomic number of 17, which indicates the number of protons and electrons in a neutral atom of chlorine is 17.
  • Therefore; with an atomic number of 17, its electronic configuration will be 2:8:7.
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Calculate the mass, in grams, of 0.245 moles of nickel(11) perchlorate
Ierofanga [76]

Answer:

38.7 g

Explanation:

first you find the molar mass of Nickle(II) Perchlorate

Nickle = 58.693 g/mol

Perchlorate is Chlorine and Oxygen combined

Molar mass of chlorine is 35.453 g/mol

Oxygen = 15.999 g/mol but since it has 4 oxygen atoms combined with chlorine you have to multiply 15.999 by 4 which is 63.996 add all the masses together and that gives you 158.142. Since you have moles you multiply the moles by the molar mass which looks like this. 0.245 * 158.142 which equals 38.74479 but with sign figs it is 38.7g as your final answer. Ask me if you are confused about something.

3 0
4 years ago
Water does not appear in the equilibrium expression because it is a pure liquid. However, the addition of water to the equilibri
stealth61 [152]

Answer:

The correct answer is: <em>The addition of water will change the concentration of the substances in equilibrium.</em>

Explanation:

For chemical reactions, the equilibrium constant is defined as the ratio between the concentration of products and reactants. In this expression pure substances should not be written, like pure liquids and gases. Since water is a pure liquid should not appear in the equilibrium. However, water is the solvent of all the solutes or substances in the reaction, thus the addition of water will make all the substances to be diluted. Also, because of the Le Châtelier principle the equilibrium should be re-establish and the concentrations whitten in the equilibrium constant should change too.

3 0
3 years ago
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