17 Two substances in a mixture differ in density and particle size. These properties can be used to(1) separate the substances(2) chemically combine the substances
(3) determine the freezing point of the mixture
(4) predict the electrical conductivity of the mixture

Answers

Answer 1

Answer:

Answer:The correct answer is option (1).

Explanation:

Density is defined as mass of substance present in the unit volume of the substance.

Density can be used to separate two substance from their mixture. Substance with lower density will place itself on the top of the substance with higher density, And in order to distinguish those two substance from each other one can easily observe the boundary among those substance.

Answer 2

Answer: If they're different sizes and densities, you are able to separate the substances.

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A fossilized animal that was killed by a volcanic eruption has 6.25 percent of its original amount of carbon-14 remaining; this radioisotope has a half-life of 5730 years. How long ago did the volcano erupt?a) 34,380 years agob) 22,920 years agoc) 17,190 years agod) 9,168 years ago

Answers

With the assumption that the animal is 100kg the remaining mass is 6.25. (assumption of mass will not matter since the decrease in mass is in percentage.)

To answer this we use the formula A=Aoe^-(ln2/t1/2)t
where
A- final amount (6.25kg)
Ao - initial amount (100kg)
t1/2 - half life (5730)
t - time it takes to change A to Ao

plugging in the values
t= 22920 years ago.

Water is moving across a membrane from solution a into solutionb. What can be inferred? Solution a must be pure water. Solution a must have a lower solute concentration than solution
b. Solution a must have a higher solute concentration than solution
b. Solution a and solution b must have the same concentration of solutes. Solution b must be pure water.

Answers

The answer is solution a must have a lower solute concentration than solution b.

That is when water is moving across a membrane from solution a into solution b, then solution a must have a lower solute concentration than solution b.

When solution a have a lower solute concentration than solution b, then water moves across a membrane from solution a into solution b.

Which compound is an electrolyte?
(1) C6H12O6 (3) CaCl2
(2) CH3OH (4) CCl4

Answers

I think the correct answer is option 3. CaCl2 is the compound that is an electrolyte when dissolved in water. An electrolyte is a substance that conducts electricity in solution. Calcium Chloride when in solution dissociates into ions which allows the flow of current in the solution.

What organisms appeared on Earth First?a). gastropods
b). horn corals
c). brachiopods
d). crinoids

Answers

it is B because horn coals are bigger and I read it in a book

What happens in a reduction half-reaction?elements gain electrons
elements lose electrons
oxygen is added
oxygen is lost

Answers

Answer: Option (a) is the correct answer.

Explanation:

A reduction-half reaction is defined as the reaction in which there occurs gain of one or more number of electrons by a specie or element.

Or, in a reduction-half reaction there occurs loss of oxygen if it is present in a reaction.

But in a reduction-half reaction loss of electrons will always take place.

For example, $CuO + Mg \rightarrow Cu + MgO$

Reduction-half reaction: $Cu^(2+) + 2e^(-) \rightarrow Cu$

So here, oxidation state of copper is changing from +2 to 0. Also, loss of oxygen is occurring in the reaction equation.

Oxidation-half reaction: $Mg \rightarrow Mg^(2+) + 2e^(-)$

Thus, we can conclude that in a reduction half-reaction elements gain electrons.

The answer is elements gain electrons. Oxidation reduction is elements lose electrons. And oxygen is added/lost can be a type of oxidation/reduction reaction.

Which will cause a decrease in gas pressure in a closed containerA) Reducing the volume
B) Adding more gas
C) Lowering the temperature