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AleksAgata [21]

2 years ago

9

Activation energy is (blank)

2 answers:

timurjin [86]2 years ago

7 0

B. The energy barrier between reactants and products

hope this helps!

(:

sladkih [1.3K]2 years ago

6 0

Entropy and Free Energy Quiz

1) B

2) C

3) A

4) C

5) D

6) C

7) B

8) C

9) B

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What is a single celled orginium able to do

vichka [17]

<span>Many life forms consist of a single cell. As well as simple bacteria, there are more complex organisms, known as protoctists. Unlike bacteria, they have complex internal structures, such as nuclei containing organized strands of genetic material called chromosomes. Most are single-celled, but some form colonies, with each cell usually remaining self-sufficient.</span>

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2 years ago

A radioactive sample has a half-life of 5 hours. What fraction of the sample will be left after 15 hours?

DedPeter [7]

Explanation:

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2 years ago

A field worker is exposed to a xylene for a duration of 8 weeks at 40 hrs/wk. The concentration of xylene in the workplace is 40

Andrej [43]

Answer:

The chronic daily intake during the period of exposure is most nearly 0.012 mg/kg day.

Explanation:

Number of hours worker exposed to xylene = $40 hr/week\times 8 week = 320 hours$

The concentration of xylene in the workplace = $40 \mu g/m^3$

The worker is inhaling air at a rate of $0.9 m^3/hr$ .

Amount xylene inhaled by worker in an hour :

= $40\mu g/m^3\times 0.9 m^3/hr=36 \mu g/hr$

Amount xylene inhaled by worker in 320 hours:

$36 \mu g/hr\times 320 hr=11,520 \mu g=11,520\times 0.001 mg=11.520 mg$

1 μg = 0.001 mg

Amount xylene inhaled by worker in 320 hours = 11.520 mg

1 day = 24 hours

Amount xylene inhaled by worker in 1 day:

$\frac{24}{320}\times 11.520 mg=0.864 mg$

Assuming 70 kg body mass, the chronic daily intake of xylene :

$\frac{0.864 mg/day}{70 kg}=0.01234 mg/ kg day\approx 0.012 mg/ kg day$

The chronic daily intake during the period of exposure is most nearly 0.012 mg/kg day.

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2 years ago

Which of the following pairs of reactants is not correctly listed with its product solution? A. Strong base-strong acid reactant

alexandr1967 [171]

Answer: Option B

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HCl + NaOH —> NaCl + H2O

From the equation obtained, The salt ( NaCl) obtained is a normal salt which is neutral.

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2 years ago

How many calories are required to heat 867 g of water from 13°c to 87°c?

skelet666 [1.2K]

64158 calories is required

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