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solong [7]
2 years ago
5

A scientist measures the mass of two liquids before and after combining them. The mass after combining the liquids is less then

the sum of the masses before. where is the missing mass? what type of change occured.
Chemistry
1 answer:
Lelu [443]2 years ago
4 0

Answer:

A chemical change occurred and a gas was produced.  

Step-by-step explanation:

If there is no chemical reaction, the <em>Law of Conservation of Mass</em> says that  

Total mass = Mass 1 + Mass 2

However, if the two liquids react and give off a gas, then

Total mass = Mass 1 + Mass 2 + Mass of gas

You are not measuring the mass of the gas, so the mass of the liquids after mixing is less than it was before mixing.

For example, if Liquid 1 was a solution of HCl and Liquid 2 was a solution of Na₂CO₃, they would give off CO₂ on mixing. but you would not be measuring the mass of the CO₂.

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How many moles of PBr3 contain 3.68 x 10^25 bromine atoms?
scoray [572]
<span>3.68 x 10²⁵ bromine atoms * 1mol/6.02*10²³ atoms=
 = 61.13 mol of bromine atoms

1 mol PBr3 ----- 3 mol Br
x mol PBr3 -----61.13 mol Br

x= 1*61.13/3 = 20.4 mol PBr3.


</span>20.4 mol PBr3 <span>contain 3.68 x 10^25 bromine atoms.</span>
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2 years ago
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Which statement correctly compares what occurs when molecules absorb photons in the microwave region with what occurs when molec
ValentinkaMS [17]

Answer:

d.) Microwave photons cause the molecules to increase their rotational energy states, whereas infrared photons cause electrons in the molecules to increase their electronic energy states.

Explanation:

Microwave: transitions in the molecular rotational levels

Infrared: transitions in molecular vibrational levels

UV/Visible: transitions in electronic energy levels.

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1 year ago
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Which statement best describes the atoms of the gas neon? O They slide past each other. They move freely in all directions. O. T
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Answer:

The statement that describes the gas of neon is

1. They are far apart.

2. They move constantly.

3. They move freely in all directions.

4. They move at high speed. Neon is termed as a chemical element. It is a noble gas.

It is odorless, colorless, inert monatomic gas when under standard condition. Neon is the second of the rare gases to be discovered. The second lightest inert gas.

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7 0
2 years ago
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The compound F2O has two lone pairs on the central oxygen atom. What's the structure of an F2O molecule? Is this compound polar
GuDViN [60]

Answer:  A) Bent or angular, polar

Explanation:

The central atom oxygen has two lone pairs and two bond pairs in OF_2. The number of electron pairs are 4,  that means the hybridization will be sp^3 and the electronic geometry of the molecule will be tetrahedral. But as there are two lone pair of atoms around the central oxygen atom, repulsion between lone and bond pair of electrons is more and hence the molecular geometry will be bent shape.

The compound OF_2 is polar as the net dipole moment of oxygen - fluoride bonds do not cancel each other out.

3 0
1 year ago
the half life of the radioactive element strontium-90 is 29.1 years. If 16 grams of strontium-90 are initially present, how many
8_murik_8 [283]

Answer:

4 g after 58.2 years

0.0156 After 291 years

Explanation:

Given data:

Half-life of strontium-90 = 29.1 years

Initially present: 16g

mass present after 58.2 years =?

Mass present after 291 years =?

Solution:

Formula:

how much mass remains =1/ 2n (original mass) ……… (1)

Where “n” is the number of half lives

to find n

For 58.2 years

n = 58.2 years /29.1 years

n= 2

or  291 years

n = 291 years /29.1 years

n= 10

Put values in equation (1)

Mass after 58.2 years

mass remains =1/ 22 (16g)

mass remains =1/ 4 (16g)

 mass remains = 4g

Mass after 58.2 years

mass remains =1/ 210 (16g)

mass remains =1/ 1024 (16g)

mass remains = 0.0156g

8 0
2 years ago
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