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Aloiza [94]
1 year ago
13

Help!!!!!!please it’s due tonight

Chemistry
1 answer:
mylen [45]1 year ago
7 0

Answer:

hello there, this was my answer

Explanation:

density = mass/volume

therefore, mass = density x volume

mass = 2.3 x 20

mass = 46g

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Iodine-138 decays by beta decay. What element does it produce?
iVinArrow [24]

{xe}^{138}

Explanation:

the bottom number would be 54. This is because you add one to 53 to make it 54 and you add 0 to 138.

4 0
2 years ago
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Give reason brick is a solid
Elenna [48]
The brick is solid because it's not hollow or containing spaces or gaps
3 0
3 years ago
Alcl3+Na =NaCl+ Al .did Al change oxidation number
saul85 [17]

Answer:

yes it is ( From +3 to 0 )

Explanation:

If this is the balanced equation:

AlCl3     +    3Na ——>    3NaCl      +      Al

Al      Cl        3Na             Na     Cl            Al

+3     -3        0                    +1       -1            0

5 0
3 years ago
H3PO4 + Ca(OH)2 → Ca(H2PO4)2 + H2O
aniked [119]

Given question is incomplete. The complete question is as follows.

Balance the following equation:

H_3PO_4 + Ca(OH)_2 \rightarrow Ca(H_2PO_4)_2 + H_2O

Answer: The balanced chemical equation is as follows.

2H_3PO_4 + Ca(OH)_2 \rightarrow Ca(H_2PO_4)_2 + 2H_2O

Explanation:

When a chemical equation contains same number of atoms on both reactant and product side then this equation is known as balanced equation.

For example, H_3PO_4 + Ca(OH)_2 \rightarrow Ca(H_2PO_4)_2 + H_2O

Number of atoms on reactant side:

H = 5

P = 1

O = 6

Ca = 1

Number of atoms on product side:

H = 6

P = 2

O = 9

Ca = 1

In order to balance this equation, we will multiply H_3PO_4 by 2 on reactant side and we will multiply H_2O by 2 on product side. Hence, the balanced chemical equation is as follows.

2H_3PO_4 + Ca(OH)_2 \rightarrow Ca(H_2PO_4)_2 + 2H_2O

8 0
3 years ago
When bases dissolve in water they release what type of negative ion?
Leto [7]
A base generally releases a hydroxide ion (OH-) when dissolved in water. 

There are exceptions, such as ammonia NH3, which acts as a base but does not produce OH- ions. There are three definitions of acids and bases (Arrhenius, Bronsted-Lowry, and Lewis) and each one looks at acid/base characteristics differently. OH- donation is the Arrhenius definition.
4 0
3 years ago
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