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alina1380 [7]
4 years ago
12

What is the answer to number 14 ?

Chemistry
1 answer:
Yuri [45]4 years ago
8 0

Answer:

a) 2 significant figures

b) 5 significant figures

c) 5 significant figures

d) 1 significant figures

Explanation:

• <u>All non-zero digits are significant.</u>

E.g. - 421 has 3 significant figures.

• <u>Zeros between non-zero digits are significant.</u>

E.g. - 502 has 3 significant figures.

• <u>In a decimal less than 1, all zeros to the left of non-zero digits are not significant.</u>

E.g. - 0.0345 has 3 significant figures.

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How many oxygen atoms are in 5 grams of cupric sulfate pentahydrate.
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Answer: 3 oxygen atoms!

Explanation: Let me know if I'm wrong, if not I'm happy to help!

8 0
3 years ago
What fraction of the carbon dioxide exhaled by animals is generated by the reactions of the citric acid cycle
puteri [66]

Answer:

1/3

Explanation:

Pyruvate is produced by the glycolysis in cytoplasm. The oxidation of pyruvate takes place in mitochondrial matrix.  

Pyruvate is converted to acetyl-CoA in the reaction given below:

Pyruvate + NAD⁺ + CoA-SH ⇒ acetyl-CoA + NADH + CO₂

1 molecule of carbon dioxide is eliminated from 1 molecule of pyruvate.

Also,  

2 molecules of carbon dioxide is eliminated from 2 molecules of pyruvate (as glucose on glycolysis yields 2 molecules of pyruvate).

Also, acetyl-CoA further goes into the citric acid cycle and produces 2 molecules of carbon dioxide.

Thus pyruvate produces total 3 molecules of CO₂  and hence glucose produces 6 molecules of CO₂ (as glucose on glycolysis yields 2 molecules of pyruvate)

Thus,

<u>Fraction = 2/6 = 1/3</u>

4 0
4 years ago
The rate constant for a certain reaction is k = 5.40×10−3 s−1 . If the initial reactant concentration was 0.100 M, what will the
IceJOKER [234]

Answer : The concentration after 17.0 minutes will be, 4.05\times 10^{-4}M

Explanation :

The expression for first order reaction is:

[C_t]=[C_o]e^{-kt}

where,

[C_t] = concentration at time 't'  (final) = ?

[C_o] = concentration at time '0' (initial) = 0.100 M

k = rate constant = 5.40\times 10^{-3}s^{-1}

t = time = 17.0 min = 1020 s (1 min = 60 s)

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

[C_t]=(0.100)\times e^{-(5.40\times 10^{-3})\times (1020)}

[C_t]=4.05\times 10^{-4}M

Thus, the concentration after 17.0 minutes will be, 4.05\times 10^{-4}M

4 0
3 years ago
Imagine that it is a sunny day and you are looking at a building that has solar panels on the roof. Which of the following state
harkovskaia [24]

Answer:

||~~~~~~~~~~~~~Hello~~~~~~~~~~~~~~||

Your answer should be:

B. The panels are absorbing a lot of light energy.

Explanation:

Hope this helped!

<em>Brainliest would be appreciated!</em>

<h2><em>Have a blessed day! :D</em></h2>
8 0
3 years ago
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