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3 years ago

A substance that is ______ will NOT dissolve in a solvent. A) freezing B) insoluble C) evaporating D) soluble

Chemistry

2 answers:

kiruha [24]3 years ago

8 0

Answer:

B)Insoluble

Explanation:

A substance that does not dissolve in a solvent is insoluble. Process of Dissolving: Solvent particles surround solute particles to form a solution in a process called solvation. (This dissolving process in water is called hydration.)

Alexxandr [17]3 years ago

4 0

Answer:

insoluble

Explanation:

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whats the specific heat of an unknown substance if the addition of 800 joules of heat energy caused a 30 gram sample to warm fro

Troyanec [42]

The specific heat capacity of unknown substance is 1.333 g/j/°c

calculation

Specific heat capacity is calculated using Q= MCΔT formula

where;

Q(heat)= 800 j

M(mass) = 30 g

C(specific heat capacity) =?

ΔT( change in temperature) = 40°c - 20°c = 20°c

make C the subject of the formula by diving both side of the formula by MΔT

C is therefore = Q/MΔT

800j / 30 g x 20°c = 1.333 j/g/°c

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3 years ago

what is the concentration (molarity) of a solution that has 0.150 moles of sodium chloride dissolved in 0.900 L solution

Alexxx [7]

Answer:

Molarity= 0.167M

Explanation:

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4 years ago

#9 answer with explanation

Slav-nsk [51]

Answer:

A. 6.0 mol H₂O

Explanation:

3 mol O₂ x $\frac{2 mol H2O}{1 mol O2}$ = 6 mol H₂O

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3 years ago

Which non-metal is a liquid at room temperature

bixtya [17]

The only nonmetal that is liquid at room temperature is the element Br or Bromine. When we say at room temperature, it means at zero degrees Celsius and at one atmospheric pressure. The metal that is liquid at room temperature is the element Hg or mercury.

4 0

3 years ago

Read 2 more answers

How many moles of oxygen are needed to make 12 moles of magnesium oxide ?

Artemon [7]

Answer:

6 moles of oxygen are needed to make 12 moles of magnesium oxide.

Explanation:

First of all you should know that the balanced chemical equation is:

2 Mg + O₂ → 2 MgO

The rule of three or 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. Remember that proportionality is a constant relationship or ratio between different magnitudes.

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:

a ⇒ b

c ⇒ x

So:

$x=\frac{c*b}{a}$

In this case the rule of three applies as follows: if 2 moles of magnesium oxide are produced from 1 mole of oxygen, 12 moles of magnesium oxide from how many moles of oxygen is produced?

$moles of oxygen=\frac{12 moles of magnesium oxide* 1 mole of oxygen}{2 moles of magnesium oxide}$

moles of oxygen= 6

6 moles of oxygen are needed to make 12 moles of magnesium oxide.

4 0

4 years ago