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3 years ago

Science question down below

Chemistry

1 answer:

kolezko [41]3 years ago

4 0

There is only 1 negative choice here, so you can solve by common sense.
C. They reproduce slower than unicellular organisms.

This is true because, for example, think of humans. We take 9 months to reproduce uses multiple stages of meiosis. Unicellular organisms on the other hand, such as bacteria, are asexual and use binary fission to reproduce, which happens very quickly, but creates less diversity.

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Which of these is an element?

just olya [345]

B
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4 years ago

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Blood alcohol concentration (BAC) is a measure of alcohol in your body, expressed as grams of alcohol per 100ml of blood. For a

ella [17]

Answer:

A 71 kg person will get a BAC of 0.05 when drinking 0.3442 L of beer

Explanation:

The mass of blood in a human body is approximately 8%, so if a person weighs 71 kg, the mass of blood would be:

71 kg * 8/100 = 5.68 kg of blood.

Using blood density, we can calculate the volume that 5.68 kg of blood occupies:

5.68 kg * $\frac{1m^{3}}{1025kg}$ = 0.0055415 m³

We convert m³ into mL, keeping the unit that we want to convert to in the numerator; and the unit that we want to convert in the denominator:

$0.0055415m^{3}*\frac{1000L}{1m^{3}} *\frac{1000mL}{1L}=5541.5mL$

Now we calculate the amount of alcohol that would be needed in the bloodstream to get a BAC of 0.05:

$\frac{5541.5mL}{100mL}*0.05g$ = 2.77 g of alcohol are needed in the bloodstream in order to have a BAC of 0.05

The amount of alcohol that needs to be ingested is higher than 2.77 g, due to the fact that only 17% of the alcohol goes into the bloodstream, so:

2.77 g $*\frac{100}{17} =$ 16.29 g of alcohol need to be ingested

Then we use the alcohol concentration of beer to calculate the volume of beer needed, using the alcohol density. First we convert the alcohol density to g/L, making sure the units that we want to convert cancel each other:

$789\frac{kg}{m^{3}}*\frac{1000g}{1kg} *\frac{1m^{3}}{1000L} =789g/L$

Now we use the density to calculate the litres of alcohol needed, keeping in mind that 16.29 g of alcohol are needed:

$16.29g*\frac{1L}{789g}=$ 0.02065 L of alcohol are needed.

Finally we calculate the litres of beer needed, keeping in mind the concentration of alcohol in beer:

$0.02065L_{alcohol}*\frac{100L_{beer}}{6L_{alcohol}} =$ 0.3442 L of beer are needed.

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3 years ago

Which event occurs after erosion of Earth's surface?

masya89 [10]

Answer: Surface materials breaks down into smaller pieces.

Explanation:

Erosion is the geological process in which the topmost layer of the soil is worn away and transported by natural forces such as wind or water. A process which resembles erosion is weathering, which lead to breaking down or dissolution of rocks, but does not involve movement of the rock or soil materials.

After erosion the layers at the top of the soil are also broken down to smaller bits by factors such as water and winds.

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4 years ago

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mercury fulminate is so unstable it is used in blasting caps. Can you offer an explanation for this instability

Yakvenalex [24]

Answer:

Mercury fulminate is very sensitive to shock, friction, and sparks. ... put mercury fulminate into blasting caps for detonating dynamite.

Explanation:

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3 years ago

An atom has 16 protons and 17 neutrons. What is the chemical symbol for the atom? Consult the periodic table.

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An atom has 16 protons and 17 neutrons. What is the chemical symbol for the atom? Consult the periodic table.
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B.32S

C.33S

D.32Cl

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4 years ago

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