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Arte-miy333 [17]
3 years ago
5

In the number 48.93, which digit is estimated?

Chemistry
1 answer:
Fudgin [204]3 years ago
7 0
The answer is 3.

Explanation:
It’s the last number and it can’t be 9 because then it would be 48.9 and no 3.
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The dissolution of calcium chloride in water is given by the following equation:
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Answer:

The reactants would appear at a higher energy state than the products.

Have a nice day!

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The positive sign of the energy difference in a chemical reaction would indicate that ..........
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Answer:

B) the chemicals are gaining energy from the surroundings.

Explanation:

The positive sign of the energy difference in a chemical reaction would indicate that the chemicals are gaining energy from the surroundings. This is what happens in an endothermic reaction.

In an endothermic reaction, heat is absorbed from the surroundings hence the surrounding becomes colder at the end of the changes.

  • Here the energy change is assigned a positive value.
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  • So, the difference gives a positive value.
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Which of the following is true of gases?
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Answer:

Answer:  A. Gases are easily compressed because of the low density.

Explanation:

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How do ionic bonds differ from covalent bonds?​
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2 years ago
A volume of 90.0 mLmL of aqueous potassium hydroxide (KOHKOH) was titrated against a standard solution of sulfuric acid (H2SO4H2
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Answer:

0.823 M was the molarity of the KOH solution.

Explanation:

H_2SO_4+KOH\rightarrow K_2SO_4+2H_2O (Neutralization reaction)

To calculate the concentration of base , we use the equation given by neutralization reaction:

n_1M_1V_1=n_2M_2V_2

where,

n_1,M_1\text{ and }V_1 are the n-factor, molarity and volume of acid which is H_2SO_4

n_2,M_2\text{ and }V_2 are the n-factor, molarity and volume of base which is KOH.

We are given:

n_1=2\\M_1=1.50 M\\V_1=24.7 mL\\n_2=1\\M_2=?\\V_2=90.0 mL

Putting values in above equation, we get:

2\times \1.50 M\times 24.7 mL=1\times M_2\times 90.0 mL

M_2=\frac{2\times 1.50M\times 24.7 mL}{1\times 90.0 mL}=0.823 M

0.823 M was the molarity of the KOH solution.

7 0
3 years ago
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