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Pepsi [2]
3 years ago
8

Group two elements are a. Metals b. Nonmetals c. Transition metals

Chemistry
2 answers:
Volgvan3 years ago
3 0

Group two elements are  

a. Metals b. Nonmetals c. Transition metals  is c

maks197457 [2]3 years ago
3 0
Aluminum and silicon
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What is the overall charge of an ion that has 12 protons, 10 electrons, and 14 neutrons?
kakasveta [241]
The charge of the ion would be +2, because there are 2 more protons than there are electrons.  The neutrons don't matter because they have a neutral charge, meaning they are neither positive nor negative.
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A chemist wants to calculate the amount of heat that is absorbed by a sample of copper as it is melted. Which constant should sh
34kurt

The constant used for the absorption of heat by the sample in melting is +\Delta H_{fus}.  Thus, option A is correct.

The chemical reaction has been defined as the energy in which the energy has been released or absorbed for the breaking of bonds in the reactants and the formation of product.

<h3>Constant for energy absorbed</h3>

The energy has been absorbed in the melting of the copper sample. Thus, the sample has been converted from the solid to the liquid state.

The change in energy with the conversion in solid and liquid state has been termed as heat of fusion.

The energy has been absorbed by the system, thus it has been marked with the positive sign.

Therefore, +\Delta H_{fus} has been the constant used for the absorption of heat by the sample in melting. Thus, option A is correct.

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8 0
3 years ago
Write each mixed number as as a decimal. Use bar notation if the decimal is repeating.
aniked [119]

Number 1 is 4.875 Number 2 is 3.47 repeating

6 0
3 years ago
What is the concentration of an unknown Mg(OH)2 solution if it took an average of 15.4mL of
vova2212 [387]

Answer:

0.077M

Explanation:

Step 1:

The balanced equation for the reaction. This is given below:

2HCl + Mg(OH)2 —> MgCl2 + 2H2O

From the balanced equation above,

The mole ratio of the acid (nA) = 2

The mole ratio of the base (nB) = 1

Step 2:

Data obtained from the question.

Concentration of base Cb =...?

Volume of base (Vb) = 10mL

Concentration of acid (Ca) = 0.1M

Volume of acid (Va) = 15.4mL

Step 3:

Determination of the concentration of the base, Mg(OH)2.

The concentration of the base can be obtained as follow:

CaVa/CbVb = nA/nB

0.1 x 15.4 /Cb x 10 = 2/1

Cross multiply to express in linear form

Cb x 10 x 2 = 0.1 x 15.4

Divide both side by 10 x 2

Cb = (0.1 x 15.4) /(10 x 2)

Cb = 0.077M

Therefore, the concentration of the base, Mg(OH)2 is 0.077M

7 0
3 years ago
An organic compound that contains a carbonyl group with a hydroxyl group attached to it is an example of a(n)
lawyer [7]
An organic compound that contains a carbonyl group with a hydroxyl group attached to it is an example of a (d) carboxylic acid.
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