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3 years ago

7

Which element has electrons in three energy levels? A. B B. Li C. Si D. SC

1 answer:

Y_Kistochka [10]3 years ago

7 0

B. Li lithium answer seems correct

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Are these mixtures or pure substance?

Archy [21]

A mixture is a system that is made up of two or more substances which are not combined chemically. A pure substance is a system that only has one substance. The following are classified as:
1.water : pure substance
<span>2.blood : mixture</span>
<span>3.the oceans : mixture</span>
<span>4.iron : pure substance
5.brass : mixture</span>
<span>6.uranium : pure substance</span>
<span>7.wine : mixture</span>
<span>8.leather : mixture</span>
<span>9.table salt (NaCl) : pure substance</span>

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3 years ago

rite stepwise equations for protonation or deprotonation of this polyprotic species in water. What are the products of the first

adoni [48]

<u>Answer:</u> The products of the given chemical equation are $HCO_3^-\text{ and }OH^-$

<u>Explanation:</u>

Protonation equation is defined as the equation in which protons get added in the substance.

The chemical equation for the protonation of carbonate ion in the presence of water follows:

$CO_3^{2-}+H_2O\rightarrow HCO_3^-+OH^-$

By Stoichiometry of the reaction:

1 mole of carbonate ion reacts with 1 mole of water to produce 1 mole of hydrogen carbonate ion and 1 mole of hydroxide ion

Hence, the products of the given chemical equation are $HCO_3^-\text{ and }OH^-$

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4 years ago

What are the properties of salt

GrogVix [38]

The compound is sodium chloride

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QUESTION 5<br> Match the symbol with the type of symbiotic relationship it represents

marshall27 [118]

Answer:

A : 1

B : 3

C : 4

D : 2

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3 years ago

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What is the basic building block of matter to a chemist

Harman [31]

The basic building block of matter is the atom.

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