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Vlad1618 [11]
3 years ago
11

A mole is defined so that one mole of carbon-12 atoms has a mass of exactly 12 grams.

Chemistry
2 answers:
andrew11 [14]3 years ago
6 0

I believe it would be

A. True

You can use this link to study:https://quizlet.com/83085591/chemistry-9-weeks-test-flash-cards/  

This should help you understand more.


OLga [1]3 years ago
4 0

Answer:

Explanation:

A

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The pH of a solution is measured as 4.5. What is the hydrogen ion concentration of the solution?
Bond [772]

Answer:

[H⁺] =  3.16 × 10⁻⁵ mol/L

Explanation:

Given data:

pH of solution = 4.5

Hydrogen ion concentration = ?

Solution;

pH = -log [H⁺]

we will rearrange this formula:

[H⁺] =  10∧-pH

[H⁺] = 10⁻⁴°⁵

[H⁺] =  3.16 × 10⁻⁵ mol/L

4 0
3 years ago
7). Which material has the highest melting point? A. ammonia B. methane C. sodium chloride D. water .with explanation every opti
Arte-miy333 [17]

Answer:

sodium chloride

Explanation:

Because of the strong ionic bonds it possesses

8 0
2 years ago
A solution of NaOH is titrated with H2SO4. It is found that 20.05 mL of 0.3564 M H2SO4 solution is equivalent to 43.42 mL of NaO
Darya [45]

Answer : The concentration of NaOH is, 0.336 M

Explanation:

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 NaOH.

We are given:

n_1=2\\M_1=0.3564M\\V_1=20.05mL\\n_2=1\\M_2=?\\V_2=43.42mL

Putting values in above equation, we get:

2\times 0.3564M\times 20.05mL=1\times M_2\times 43.42mL

M_2=0.336M

Thus, the concentration of NaOH is, 0.336 M

3 0
3 years ago
Only 11% of all the energy used in the US comes from a renewable source. Why is this a<br> problem?
mr Goodwill [35]
Fossil fuels and unnatural energy sources still dominate in the US, this influences many problems including global warming, climate change, and pollution. Burning fossil fuels is also a problem to human health. And unnatural resources won’t be there forever whereas, renewable sources could last a long time.
5 0
3 years ago
The ratio of x to y is 4 to 12. Fill in numbers to<br>form a table with the given ratio,​
murzikaleks [220]

Answer:

Explanation:

x                                     y

4                                     12

8                                     24

12                                   36

16                                   48

20                                  60

           

4 0
3 years ago
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