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Lady bird [3.3K]
1 year ago
11

Ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc

Chemistry
2 answers:
Molodets [167]1 year ago
5 0

Answer:

Explanation:

What bro

zloy xaker [14]1 year ago
4 0
Answer what is going on

Explanation You are crazy
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Which polyatomic ion is found in the compound represented by the formula NaHCO3?
olga nikolaevna [1]

Answer is (2) - hydrogen carbonate


<em>Explanation:</em>


NaHCO₃ is an ionic compound which is made from Na⁺ and HCO₃⁻ ions. The decomposition is

NaHCO₃ → Na⁺ + HCO₃⁻


Among the resulted ions, Na⁺ is a monatomic ion while HCO₃⁻ is a polyatomic ion.


<em>Polyatomic ions mean ions which are made of two or more different atoms.</em>


HCO₃⁻ is made from 3 atoms as H, C and O. The name of HCO₃⁻ ion is bicarbonate or hydrogen carbonate.

8 0
3 years ago
What are the solutions to the equation x2 + 4x + 5 = 0?​
dusya [7]

Answer:

-1, -4

Explanation:

x^2+4x+5=0

Factoring, you get:

(x+4)(x+1)=0

To find what x can be, you need to realize what could make this equation true. To set the left side equal to 0, either one of the terms in parentheses must be equal to 0. To do that, x must be the negative of the other term, so that they can cancel each other out. Therefore, x is -4 and -1. Hope this helps!

4 0
2 years ago
Read 2 more answers
5.
ANEK [815]
Knowledge of chemistry allows the public to make informed decisions
5 0
2 years ago
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A pot of water is heated over a fire, and then frozen peas are added to the hot water. What happens to the energy in this situat
erastovalidia [21]

The fourth option is correct. Energy is transferred from the fire to the pot, and then to the water, and then to the peas.

5 0
3 years ago
Read 2 more answers
Copper has only two naturally occurring isotopes, Cu-63 and Cu-65. The mass of Cu-63 is 62.9396 amu, and the mass of Cu-65 is 64
andriy [413]

Answer:

The percentage relative abundance of Cu-63 is 69.5% and that of Cu-65 is 30.5%

Explanation:

The mass of Cu-63 is 62.9396 amu

The mass of Cu-65 is 64.9278 amu

Relative abundance of each isotope ?

The average atomic mass of Copper is; 63.546 u

The relationship between abundance, mass of isotopes and average atomic mass is;

(M1)(x) + (M2)(1-x) = M(E)

Where;

M1 = Mass of first isotope

x = Abundance of first isotope

M2 = Mass of second isotope

M(E) = Average atomic mass

Inserting the vaues, we have;

62.9396 (x) + 64.9278 (1-x) = 63.546

62.9396x - 64.9278x + 64.9278 = 63.546

- 1.9882x = 63.546 - 64.9278

- 1.9882x  = - 1,3818

x = 0.695 or 69.5%

The percentage relative abundance of Cu-63 is 69.5% and that of Cu-65 is 30.5%

8 0
3 years ago
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