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3 years ago

8

An unknown or changeable quantity is called a(n)...

1 answer:

alexgriva [62]3 years ago

6 0

I think the answer would be dependent variable. An unknown or changeable quantity is called a dependent variable. It <span>is what you measure in the experiment and what is affected during the experiment. Hope this answers the question. Have a nice day.</span>

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What is the volume of 1g of ice in cm3?

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Explanation:

3 0

3 years ago

A chemistry instructor provides each student with 8 test tubes at the beginning of the year. If there are 28 students per class,

klemol [59]

Three classes: 28×3=84 students
8 test tubes per student: 84× 8= 672
hope this helps!

7 0

3 years ago

How do you know if a reaction is endothermic

Karo-lina-s [1.5K]

If the temperature rises in a reaction. Exothermic is if it loses heat.

Have a nice day, brainliest would be fantastic.

7 0

3 years ago

the formula of calcium oxide is CaO. What is the formula of the ionic compound containing calium abd sulfate ions

sineoko [7]

Answer:

$CaS$

Explanation:

Hello!

In this case, since calcium's oxidation state when forming ionic bonds is +2 and sulfur's oxidation state when bonding those bonds is -2, for the required formula we write:

$Ca^{2+}S^{2-}$

Now, since they have the same charge number, we infer the ionic compound formed when they bond is calcium sulfide:

$CaS$

Best regards!

5 0

3 years ago

Find the no. of atoms present in 40g of nitrogen gas at STP?

nika2105 [10]

Answer:

8.60 * $10^{23}$ atoms N2

Explanation:

We want to convert grams to moles and then moles to atoms.

First, we convert grams of nitrogen gas (which is N2) to moles. To do so, we need the molar mass of N2, which is just 14.01 * 2 = 28.02 g.

40 g N2 * $\frac{1 mol N2}{28.02 g N2}$ = 1.43 mol N2

Now, we need to convert moles to atoms by using Avogadro's number, which is $6.022*10^{23}$ :

1.43 mol N2 * $\frac{6.022*10^{23} atoms N2 }{1 mol N2}$ = 8.60 * $10^{23}$ atoms N2

Thus, the answer is 8.60 * $10^{23}$ atoms N2.

6 0

3 years ago