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umka2103 [35]
3 years ago
9

Four students drew part of the rock cycle on the board. Which drawing was correct?

Chemistry
1 answer:
Alexeev081 [22]3 years ago
3 0

Answer:the answer is C

Explanation:

I got it right on my test

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Answer:

B

Explanation:

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3 years ago
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How many salt and water would you use to prepare 10% salt solution?
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Answer:

We can make 10 percent solution by volume or by mass. A 10% of NaCl solution by mass has ten grams of sodium chloride dissolved in 100 ml of solution. Weigh 10g of sodium chloride. Pour it into a graduated cylinder or volumetric flask containing about 80ml of water.

Explanation:

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2 years ago
10. A 2.36-gram sample of NaHCO3 was completely decomposed in an
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Answer:

0.79 g

Explanation:

Let's introduce a strategy needed to solve any similar problem like this:

  • Apply the mass conservation law (assuming that this reaction goes 100 % to completion): the total mass of the reactants should be equal to the total mass of the products.

Based on the mass conservation law, we need to identify the reactants first. Our only reactant is sodium bicarbonate, so the total mass of the reactants is:

m_r=m_{NaHCO_3}=2.36 g

We have two products formed, sodium carbonate and carbonic acid. This implies that the total mass of the products is:

m_p=m_{Na_2CO_3}+m_{H_2CO_3}

Apply the law of mass conservation:

m_r=m_p

Substitute the given variables:

m_{NaHCO_3}=m_{Na_2CO_3}+m_{H_2CO_3}

Rearrange for the mass of carbonic acid:

m_{H_2CO_3}=m_{NaHCO_3}-m_{Na_2CO_3}=2.36 g - 1.57 g=0.79 g

8 0
3 years ago
FOR NARUTO FANS ONLY
Andrei [34K]

Answer:

the last airbender is on Netfilx

Explanation:

go watch it

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