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weqwewe [10]
3 years ago
10

What is work and state the law of conservation mass?​

Chemistry
1 answer:
Butoxors [25]3 years ago
7 0

Answer:

Work is a force causing the movement or displacement of an object

law of conservation mass:

1. Atoms cannot be created or destroyed in a chemical reaction.

2. Molecules cannot be created or destroyed in a chemical reaction.

3. Compounds cannot be created or destroyed in a chemical reaction.

4. Heat cannot be created or destroyed in a chemical reaction.

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Explanation:

7 0
3 years ago
How have safety concerns about chemicals changed over time?
Alex787 [66]

Answer:

C. As scientists have learned more about chemicals, they have  become more aware of their dangers

Explanation:

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8 0
3 years ago
Why do thermistors increase in conductivity when heated? What happens in normal metals? Explain on the atomic level.
Marysya12 [62]

Metal conductivity generally goes down or resistivity goes up with temperature goes up.

7 0
2 years ago
For hydrocyanic acid, HCN, Ka = 4.9 × 10-10. Calculate the pH of 0.20 M NaCN. What is the concentration of HCN in the solution?
gogolik [260]
By using the ICE table :

initial    0.2 M            0           0
change -X                 + X           +X
Equ     (0.2 -X)            X               X

when Ka = (X) (X) / (0.2-X)
so by substitution:

4.9x10^-10 = X^2 / (0.2-X) by solving this equation for X 
∴X ≈ 10^-6
∴[HCN] = 10^-6

and PH = -㏒[H+]
             = -㏒ 10^-6
             = 6
3 0
3 years ago
Read 2 more answers
I was named after the man that developed the periodic table.
valina [46]
Einsteinium
I hope that helps
4 0
3 years ago
Read 2 more answers
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