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3 years ago

Light travels at a speed of 3.00 × 1010 cm/sec. What is the speed of light in kilometers/hour?

Chemistry

1 answer:

snow_lady [41]3 years ago

4 0

Answer:

300,000km is the speed of light

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Indicate which solution in each pair has the lower pH. Your response should be a four letter "word". The first letter should be

JulijaS [17]

Answer:

bcfh

Explanation:

HClO₄ reacts with water thus:

HClO₄ + H₂O → H₃O⁺ + ClO₄⁻

That means HClO₄ produce H₃O⁺ that decreases pH. That means the higher concentration of HClO₄ decreases pH. Thus, lower pH will be:

b) 0.2 M HClO4

The reaction of NaClO₄ is:

NaClO₄ + H₂O → OH⁻ + HClO₄ + Na⁺

The higher concentration of NaClO₄ the higher production of OH⁻ that increase pH, that means the lower concentration of NaClO₄ the lower pH, thus, the answer is:

<em>c) 0.1 M NaClO or</em>

HF reacts with water thus;

HF ⇄ H⁺ + F⁻

The equilibrium constant is:

k = [H⁺] [F⁻] / [HF] = 3,5x10⁻⁴

For HNO₂ equilibrium is:

HNO₂ ⇄ H⁺ + NO₂⁻

k = [H⁺] [NO₂⁻] / [HNO₂] = 4,5x10⁻⁴

As k value is higher for HNO₂, the concentration of H⁺ will be higher in this system doing the HNO₂ with the lower pH.

f) 0.1 M HNO2

NaOH is a strong base that produce OH⁻ that increase pH, pure water is neutral, thus, the lowe pH is:

h) pure water

I hope it helps!

7 0

4 years ago

I have a buddy who recycles electronics, and isolates metals from the connector pins electrical boards. He isolates gold, for ex

bogdanovich [222]

Solution :

In the process to isolate gold that has a 80 percent yield, a 3.00 g of Au is being isolated.

That is, the actual yield of Au is 3. 00 g

Therefore, we need to find the theoretical yield.

As we know,

$\text{percent yield}=\frac{\text{actual yield}}{\text{theoretical yield}} \times 100$

$\text{theoretical yield}=\frac{\text{actual yield}}{\text{present yield}} \times 100$

As actual yield = 3.00 g

percent yield = 80 %

So, theoretical yield = $\frac{3.00}{80} \times 100$

= 3.75 g

Thus he should be able to get 3.75 g which is the theoretical yield of Au.

5 0

3 years ago

Infer that if all atoms contain the same subatomic particles, what makes the atoms of different elements different?

lbvjy [14]

They aren’t the same atoms.

6 0

3 years ago

Read 2 more answers

Does the surface area of an object affect how fast it falls?

ValentinkaMS [17]

No it do not but it uses gravity and falls fast So. The surface do not affect how fast objects fall. Hope this helps:)

7 0

3 years ago

Read 2 more answers

Zinc carbonate and sulfuric acid can be used to make a salt. Write the word equation

VladimirAG [237]

Answer:

ZnCO3+H2SO4= ZnSO4+H2CO3

Explanation:

ZnCO3+H2SO4= ZnSO4+H2CO3

<u>Zinc is more reactive than hydrogen, hence, it will displace Hydrogen from Sulfuric acid.</u>

5 0

3 years ago