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3 years ago

HELP HURRY

Chemistry

2 answers:

In-s [12.5K]3 years ago

8 0

Answer:b

Explanation: i had this question

Mariulka [41]3 years ago

7 0

Answer: B)

Explanation:

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Drinking water should have sufficiently low levels of __________ to prevent disease. What is the missing word in this sentence?

ELEN [110]

For water to be drinkable, it must have sufficiently low levels of dissolved salts and microbes.

3 0

3 years ago

Sulfur and oxygen form both sulfur dioxide and sulfur trioxide. When samples of these are decomposed, the sulfur dioxide produce

bezimeni [28]

<u>Answer:</u>

<u>For A:</u> The mass of oxygen per gram of sulfur for sulfur dioxide is 0.997 g

<u>For B:</u> The mass of oxygen per gram of sulfur for sulfur trioxide is 1.5 g

<u>Explanation:</u>

<u>For A:</u>

The chemical equation for decomposition of sulfur dioxide follows:

$SO_2\rigtarrow S+O_2$

We are given:

Mass of sulfur = 3.47 g

Mass of oxygen = 3.46 g

To calculate the mass of oxygen per gram of sulfur, we apply unitary method:

For every 3.47 g of sulfur, 3.46 g of oxygen will form.

So, for 1 gram of sulfur, $\frac{3.46g}{3.47g}\times 1g=0.997g$ of oxygen will form.

Hence, the mass of oxygen per gram of sulfur for sulfur dioxide is 0.997 g

<u>For B:</u>

The chemical equation for decomposition of sulfur trioxide follows:

$2SO_3\rigtarrow 2S+3O_2$

We are given:

Mass of sulfur = 5.50 g

Mass of oxygen = 8.25 g

To calculate the mass of oxygen per gram of sulfur, we apply unitary method:

For every 5.50 g of sulfur, 8.25 g of oxygen will form.

So, for 1 gram of sulfur, $\frac{8.25g}{5.50g}\times 1g=1.5g$ of oxygen will form.

Hence, the mass of oxygen per gram of sulfur for sulfur trioxide is 1.5 g

3 0

3 years ago

13. when "doing science" using the scientific method, which of these would be at the top of the list? this is about science, les

Korolek [52]

Answer:

make an observation

Explanation:

8 0

3 years ago

Read 2 more answers

Select the correct answer.

frozen [14]

Answer:

1.79x10^-14

Explanation:

pOH + pH = 14

H+=10^-pH

- Hope that helps! Please let me know if you need further explanation.

3 0

3 years ago

What is the Na+ concentration in each of the following solutions:

KIM [24]

<h3>a) <u>Answer;</u></h3>

A- 7.30 M

<h3><u>Explanation;</u></h3>

3.65 Sodium sulfate

Na2(SO4) dissociates to give sodium ions and sulfate ions.

Na2(SO4) → 2Na+ + SO₄²₋

Therefore, twice the concentration of sodium ions as far as molarity is concerned.

<em><u>Concentration of sodium ions = 3.65 × 2= 7.3 M</u></em>

<h3>b) <u> Answer;</u></h3>

B- 2.76 M

<h3><u>Explanation;</u></h3>

b) 1.38 M sodium carbonate

Sodium carbonate dissociates completely to yield Sodium ions and carbonate ions

Na₂CO₃ → 2Na+ + CO₃²₋

The concentration of sodium ions will be twice the concentration of initial compound since it has a ratio of two.

<em>Concentration of sodium ions = 1.38 ×2 </em>

<h3>c) <u>Answer;</u></h3>

<h3><u>Explanation;</u></h3>

b) 0.785 sodium bicarbonate

Sodium bicarbonate dissociates completely to sodium ions and a bicarbonate ions.

NaHCO₃ →Na+ + HCO₃⁻

In this case the concentration of Na+ will be equal to the concentration of the original compound since they share the same ratio.

Thus; <em><u>Na+ concentration = 0.785 M</u></em>

7 0

3 years ago

Read 2 more answers