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docker41 [41]
3 years ago
11

A science teacher gave a student a sample of a clear liquid labeled "unknown

Chemistry
2 answers:
vodomira [7]3 years ago
6 0

Answer:

A. The sample's boiling point

Explanation:

Because by knowing boiling point we easily find a substance for example if given clear liquid boiling point is 100 c° we immediately know this is water.

Moreover boiling point is a fixed quantity for a substance.

a_sh-v [17]3 years ago
6 0

Answer:

gergergregergergergerg

Explanation:

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How many molecules are in 2.3 moles of h2o
Naddik [55]

Each mole of substance contains 6.02 x <span>1023</span> component parts, in this case water molecules.

If you have 2.3 moles of water you will have 2.3 x 6.02 x <span>1023</span> which is 1.3846 x <span>1024</span> molecules.

Each molecule contains 2 hydrogen atoms, so the total number of hydrogen atoms in 2.3 moles of water will be 2 x 1.3846 x <span>1024</span> = 2.7692 x <span>1024</span>.

Please mark brainliest, thanks :)

7 0
3 years ago
Read 2 more answers
For a certain experiment, a student requires 100 milliliters of a solution that is 8% HCl (hydrochloric acid). The storeroom has
exis [7]

Answer:

70 mL of 5% HCl and 30 mL of 15% HCl

Explanation:

We will designate x to be the fraction of the final solution that is composed of 5% HCl, and y to be the fraction of the final solution that is composed of 15% HCl. Since the percentage of the final solution is 8%, we can write the following expression:

5x + 15y = 8

Since x and y are fractions of a total, they must equal one:

x + y = 1

This is a system of two equations with two unknowns. We will proceed to solve for x. First, an expression for y is found:

y = 1 - x

This expression is substituted into the first equation and we solve for x.

5x + 15(1 - x) = 8

5x+ 15 - 15x = 8

-10x = -7

x = 7/10 = 0.7

We then calculate the value of y:

y = 1 - x = 1 - 0.7 = 0.3

Thus 0.7 of the 100 mL will be the 5% HCl solution, so the volume of 5% HCl we need is:

(100 mL)(0.7) = 70 mL

Similarly, the volume of 15% HCl we need is:

(100 mL)(0.3) = 30 mL

3 0
3 years ago
Explain what the ecliptic is
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The Ecliptic is an imaginary line on the sky that marks the annual path of the sun. It is the projection of Earths orbit onto the celestial sphere. The ecliptic is even the starting point for the celestial coordinate system used by astronomers to pinpoint the location of every star, nebula, and galaxy.
7 0
3 years ago
If an element has 43 electrons, 56 neutrons, and 43 protons, what is its approximate atomic mass?
Bas_tet [7]
Approximately 99 because there is the same amount of electrons and the only things that go into the nucleus is protons and neutrons.
4 0
3 years ago
Aluminum bromide and chlorine gas react to<br> form aluminum chloride and bromine gas.
Margarita [4]

Answer:

ok

Explanation:

4 0
3 years ago
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