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3 years ago

11

When ethanol is burned, it's converted into carbon dioxide and water. Does the ethanol undergo a physical change or a chemical c

hange? Explain?

1 answer:

NARA [144]3 years ago

3 0

It's a chemical change because ethanol is converted into other substances.

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Determine how many significant figures are in each measurement.(9pts)

Strike441 [17]

1. 3 significant figures
2. 5 significant figures
3. 3 significant figures
4. 4 significant figures
5. 5 significant figures
6. 2 significant figures
7. 4 significant figures
8. 1 significant figure
9. 4 significant figures

5 0

3 years ago

What is the mole fraction of potassium dichromate, K2Cr2O7, in a solution prepared from 24.42 g of potassium dichromate and 240.

Harrizon [31]

Answer:

$6.19\times 10^{-3}$ is the mole fraction of potassium dichromate.

Explanation:

Mass of potassium dichromate = 24.42 g

Moles of potassium dichromate = $n_1=\frac{24.42 g}{294.185 g/mol}=0.0830 mol$

Mass of water = 240.0 g

Moles of water = $n_2=\frac{240.0 g}{18.015 g/mol}=13.3222 mol$

Mole fraction is calculated by:

$\chi_1=\frac{n_1}{n_1+n_2}$

$\chi_1=\frac{0.0830 mol}{0.0830 mol+13.3222 mol}=0.00619=6.19\times 10^{-3}$

$6.19\times 10^{-3}$ is the mole fraction of potassium dichromate.

8 0

3 years ago

The reaction taking place in the sun's core _______.

kogti [31]

The answer is B

Explanation:The core of the sun is known as nuclear fusion and involves hydrogen nuclei combining together to form helium.

5 0

3 years ago

The compound tyrosine contains 59.66% C, 6.12% H, 7.73% N, and 26.49% O by mass. What is the empirical formula of tyrosine?

ycow [4]

Answer: C9H11O3N

Explanation:

The percentage by mass of each element is divided by its relative atomic mass. The lowest ratio is now observed. Each ratio is now divided by this lowest ratio and approximated to whole numbers. All these are shown in detail in the image attached.

6 0

4 years ago

this is the scale used to describe how acidic or basic a solution is. this affects the enzymes within living systems is called

mart [117]

Answer is pH.
means Power of Hydrogen.

4 0

4 years ago

Read 2 more answers