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3 years ago

5. Which of the following materials

Chemistry

1 answer:

creativ13 [48]3 years ago

7 0

Answer: acetone

Explanation: Acetone has the weakest intermolecular forces, so it evaporated most quickly. Water had the strongest intermolecular forces and evaporated most slowly.

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A manufacturer of bicycles has 4250 wheels, 2755 frames and 2255 handlebars.

Gemiola [76]

Answer:

The answer to your question is a) 2125 bicycles

c) No wheels, 630 frames, 130 handlebars.

Explanation:

Data

4250 wheels

2755 frames

2255 handlebars

- To manufacture a bicycle we need:

2 wheels x bicycle

1 frame

1 handlebar

- Divide the number of wheels

4250/ 2 = 2125 bicycles / wheels

2755 = frames

2255 = handlebars

As the number of pairs of wheels is lower than the number of frames and the number of handlebars we conclude that we can only manufacture 2125 bicycles.

No wheels

Frames = 2755 - 2125 = 630

Handlebars = 2255 - 2125 = 130

6 0

3 years ago

Can someone help me? We literally started this unit yesterday and I got quarantined so I dont have a clue what im doing..

zloy xaker [14]

Answer:

Explanation:

Take out your periodic table.

The choices that have one 1 member of the periodic table on it are elements.

He is the symbol for Helium

O2 oxygen

C3 but this is really odd. It is Carbon but Carbon usually does not combine in 3s.

The rest are all compounds (they are made up of the elements on the periodic table). For example

H2SO4

is made up of 2 Hydrogens

1 sulfur

4 oxygens.

All the others do exactly the same thing.

3 0

3 years ago

Choose Calcium (Ca). <br> a. What type of element is it?

Lubov Fominskaja [6]

Answer:

bone. Well it's technically bone

Explanation:

I don't know

6 0

3 years ago

Calculate the volume of air in liters that you might inhale (and exhale) in 12.0 hours. Assume that each breath has a volume of

zloy xaker [14]

Taking into account the rule of three, the volume of air that you inhale (and exhale) in 12.0 hours is 4,384.8 liters.

<h3>Rule of three</h3>

In first place, the rule of three is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them.

That is, what is intended with it is to find the fourth term of a proportion knowing the other three.

If the relationship between the magnitudes is direct, that is, when one magnitude increases, so does the other (or when one magnitude decreases, so does the other) , the direct rule of three must be applied.

To solve a direct rule of three, the following formula must be followed, being a, b and c known data and x the variable to be calculated:

a ⇒ b

c ⇒ x

So: $x=\frac{cxb}{a}$

<h3 /><h3>Volume of air inhaled and exhaled</h3>

To calculated the volume of air inhaled and exhaled in 12 hours, you know that each breath has a volume of 0.435 liters, and that you are breathing 14 times a minute.

The you can apply the following rule of three: If each breath has a volume of 0.435 liters, 14 breaths have how much volume?

$volume=\frac{14 breathsx0.435 liters}{1 breath}$

<u><em>volume= 6.09 liters</em></u>

So, 14 breaths a minute have a volume of 6.09 liters, this means that in 1 minute you inhale and exhale 6.09 liters.

Now, knowing that 1 hour has 60 minutes, 12 hours has 720 minutes. So you can apply the following rule of three: in 1 minute you inhale and exhale 6.09 liters, in 720 minutes you inhale and exhale how much volume?

$volume=\frac{720 minutesx6.09 liters}{1 minute}$