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2 years ago

11

I need help please Which option is chemical change?

1 answer:

MrRa [10]2 years ago

8 0

Answer:

Getting coated with tarnish

Explanation:

Silver, the original substance is combining with a new substance tarnish to make a whole new chemical.

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Look at the questions below and decide which is declarative.

Yuliya22 [10]

Im not sure but here is some information to help A declarative question is a yes-no question that has the form of a declarative sentence but is spoken with rising intonation at the end. Declarative sentences are commonly used in informal speech to express surprise or ask for verification.

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3 years ago

How many are the natural occurring elements?

sergejj [24]

there are 92 naturally occuring elements

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3 years ago

Which two parts of the atom are found in nucleus?

faust18 [17]

Answer:

protons and neutrons are found in nucleus

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3 years ago

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For which process would the pictured cell be used?

DaniilM [7]

Answer:

Coating a material with metal

(SInce the glasses will be coated with gold.)

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1 year ago

What is the molarity of solution that is 5.50 percentage by mass oxalic acid and has a density of 1.024 g/ml

Y_Kistochka [10]

Answer:

0.6257 M is the molarity of solution that is 5.50 percentage by mass oxalic acid.

Explanation:

Mass percentage of oxalic acid = 5.50%

This means that in 100 grams of solution there are 5.50 grams of oxalic acid.

Mass of solution , m = 100

Volume of the solution = V

Density of the solution = d = 1.024 g/mL

$V=\frac{m}{d}=\frac{100 g}{1.024 g/mL}=97.66mL$

V = 97.66 mL = 0.09766 L

(1 mL = 0.001 L)

Moles of oxalic acid = $\frac{5.50 g}{90 g/mol}=0.06111 mol$

$Molarity=\frac{\text{Moles of solute}}{\text{Volume of solution in L}}$

The molarity of the solution :

$=\frac{0.06111 mol}{0.09766 L}=0.6257M$

0.6257 M is the molarity of solution that is 5.50 percentage by mass oxalic acid.

6 0

3 years ago