CHEMISTRY HIGH SCHOOL

What is the identity of a sample that has a mass of 8.97 g and a volume of 0.79 cm3?A.copper
B.gold
C.lead
D.iron

Answers

Answer 1
Answer:

Answer: The correct option is Option C.

Explanation:

To identify the sample, we will determine the density of the unknown sample and match it with the specific densities. The equation used to calculate the density of a sample is given by:

Density=(Mass)/(Volume)

We are given:

Mass of the sample = 8.97 g

Volume of the sample = 0.79cm^3

Putting values in above equation, we get:

\text{Density of the sample}=(8.97g)/(0.79cm^3)=11.35g/cm^3

This value of density matches the specific density of lead.

Hence, the correct option is Option C.
Answer 2
Answer: Calculate the density:

m=8.97 \ g \nV=0.79 \ cm^3 \n \n\rho=(m)/(V)=(8.79 \ g)/(0.79 \ cm^3) \approx 11.35 \ (g)/(cm^3)

It's the density of lead, so the answer is C.

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Equal amounts of ethanol and water are mixed at room temperature and at 101.3 kPa. Which process is used to separate the ethanol from the mixture?

Answers

Answer:

The process is known as fractional distillation

Explanation:

  • In order to separate the water from the ethanol at mixed room temperature with pressie of 1013 Kpa. The technique relies on the differential boiling points of the vapors that form a mixture above the flasks.
  • Thus the lower boiling points will lead to vaporize and rise through the column. Thus the remaining solution will bet concentrated and the amount of solvent it will decrease and substance with the lowest boiling point or room temperature will be collected first.
The answer is (1) distillation. Because the ethanol and water will mix well to form a solution

There are three types of plate boundaries. Which choice is NOT a type of plate boundary?A) convergent
B) divergent
C) thrust
D) transform

Answers

The thrust is not the type of plate boundary.

The outer surface of the earth has been said to be composed of tectonic plates. The tectonic plates give rise to the shape of the zigzag puzzle. The puzzled plate boundaries are present in varying forms based on their shape.

The plate boundaries can be convergent. In this type of boundary, the earth's crust has been coming towards each other. They have been found between the Indian Plate and the Eurasian Plate.

The divergent plate boundary arises in the form of the earth crust moving away from each other. This will give rise to the mountain ranges.

The transform type of plate boundary has been formed when the tectonic plates slide over each other. This type of boundary has resulted in the  San Andreas Fault.

The thrust is not the type of plate boundary.

For more information about plate boundary, refer to the link:

brainly.com/question/13434837
There Are Three Types Of Plate Boundaries. Which choice is NOT a Type Of Plate Boundary?

Answer:C. Thrust

A liquid mixture in which particles can be seen and easily separated by settling or filtration is aa. solution.
b. suspension.
c. solvent.
d. solute.

Answers

The answer for this statement is letter B. suspension. The liquid mixture in which particles can be seen and easily separated by settling or filtration is a  suspension. 

Answer:

suspension

Explanation:

The first person to use the term "atom" was _____. Dalton Democritus Aristotle the Egyptians

Answers

the term atom comes from Greek. Democritus was the first person to use the name.
Democritus. Is. The. Correct. Answer I. Hope this will be helpful

The molar mass of CO2 is 44.01 g/mol. Which is the mass of 3.21×1025 molecules of CO2

Answers

Given:

Molar mass of CO2 = 44.01g/mol

3.21x10^25 molecules of CO2

Required:

Mass of CO2

Solution:

Avogadro’s number states that for every mole of atom, there are 6.023x10^23 units of atom. The units may be formula units, atoms. In here, you need to divide 3.21x10^25 molecules of CO2 to 6.023x10^23 molecules per mole.

 

3.21x10^25 molecules of CO2 / 6.023x10^23 molecules per mole = 53.30 moles CO2

53.30 moles CO2 (44.01g/mol CO2) = 2346 g of CO2

if burning wood causes the energy of the surroundings to increase by 12,000J what is the change in energy of the wood

Answers

Due to the law of conservation of energy we know that the energy that heated the surrounding had to have come from the reaction which means that the wood (with oxygen since this is combustion) lost 12000J. The change in energy for the wood is negative. I hope this helps. Let me know if anything is unclear.
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