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2 years ago

Which of the following is not an example of a pure element?

2 answers:

8 0

Copper wire is not an example of a pure element because although it's made by pure elements, it's not one itself. It's made by factories.

Have a nice day! :)

Pavlova-9 [17]2 years ago

8 0

B) O2

hopefully that helps lol if u have any more questions like that do be afaid to ask me

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What is an example of an organ A.pancreas B.blood C.insulin D.knee

marissa [1.9K]

Answer: pancreas

Explanation:

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2 years ago

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What is the name of Se2Cl7?

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Answer:

diselenium heptachloride

Explanation:

Se2Cl7

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2 years ago

If 30.943 g of a liquid occupy a space of 35.0 ml. What is the density of the liquid in g/cm3?

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Mass / volume = density
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2 years ago

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Missions to mars are feasible only once every two years ?

krek1111 [17]

Answer:

Yes.

Explanation:

If you want to use the least fuel, then missions to Mars are feasible every two years.

You want to launch when Earth and Mars are close together, and this happens <em>about every 26 months</em>.

However, Earth travels faster than Mars, so the spaceship must launch when Mars is 44° <em>ahead </em>of Earth in its orbit.

The ship will then use the most efficient trajectory to arrive at Mars.

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3 years ago

A sample of chlorine gas occupies a volume of 707 ml at 2.90 atm. What is the new pressure in torr if the volume is compressed t

dolphi86 [110]

Answer:

The new pressure is 3850 torr.

Explanation:

The relation between volume and pressure is inverse as per Boyle's law. Its mathematical form is given by :

$P_1V_1=P_2V_2$

Here,

$P_1=2.9\ atm$

$V_1=707\ mL$

$V_2=0.533\ L$

Let $P_2$ is the new pressure. So using Boyle's law we get :

$P_2=\dfrac{P_1V_1}{V_2}\\\\P_2=\dfrac{2.9\times 707}{0.533}\\\\P_2=3846.71\ \text{torr}$

$P_2=3850\ \text{torr}$

So, the new pressure is 3850 torr.

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3 years ago