2 years ago

Which sample of matter is classified as a substance

1 answer:

3 0

Answer:

Elements and Compounds. Any sample of matter that has the same physical and chemical properties throughout the sample is called a substanceAny sample of matter that has the same physical and chemical properties throughout the sample.

Explanation:

You might be interested in

Question 2 Calculate the pH of a solution that has an acetic acid concentration of 0.05 M and a sodium acetate concentration of

Eva8 [605]

Answer : The pH of the solution is, 4.9

Explanation : Given,

Dissociation constant for acetic acid = $K_a=1.8\times 10^{-5}$

Concentration of acetic acid = 0.05 M

Concentration of sodium acetate = 0.075 M

First we have to calculate the value of $pK_a$ .

The expression used for the calculation of $pK_a$ is,

$pK_a=-\log (K_a)$

Now put the value of $K_a$ in this expression, we get:

$pK_a=-\log (1.8\times 10^{-5})$

$pK_a=5-\log (1.8)$

$pK_a=4.7$

Now we have to calculate the pH of buffer.

Using Henderson Hesselbach equation :

$pH=pK_a+\log \frac{[Salt]}{[Acid]}$

$pH=pK_a+\log \frac{[CH_3COONa]}{[CH_3COOH]}$

Now put all the given values in this expression, we get:

$pH=4.7+\log (\frac{0.075}{0.05})$

$pH=4.9$

Therefore, the pH of the solution is 4.9.

8 0

2 years ago

Batteries are a source of __________ energy.<br> chemical<br> potential<br> mechanical

dimaraw [331]

Answer:

Batteries store chemical energy

Explanation:

3 0

2 years ago

Read 2 more answers

A student mixes a white solid and a clear liquid together. The mixture turning orange is evidence of a chemical reaction.

yulyashka [42]

Answer:

true

Explanation:

7 0

2 years ago

Read 2 more answers

Which of the following procedures is used during the fractional distillation of petroleum?

dem82 [27]

Increase at the temperature

7 0

2 years ago

Mrs. Rushing fills a balloon with hydrogen gas to demonstrate its ability to burn. Which combination could she use to produce th

ale4655 [162]

Answer:

Mg and HCI

Explanation:

3 0

2 years ago

Read 2 more answers