CHEMISTRY HIGH SCHOOL

The two basic properties of all matter are volumelength and densitymass.

Answers

Answer 1
Answer:

It's mass and volume.
Answer 2
Answer:

Answer:

it is volume and mass

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Why does a heating curve have horizontal plateaus at certain points during the heating process? What is happening at those points?

Answers

A heating curve having horizontal plateaus at certain points during the heating process means that the process occurs at increase heating. 

Which element has the greatest density at stp? calcium, chlorine, carbon or copper?

Answers

density = mass/volume

Since at STP, one mole of any gas occupies 22.4 liters, therefore, the volume is equal.
So, we will arrange based on mass.

From the periodic table:
mass of carbon = 12 grams
mass of calcium = 40 grams
mass of chlorine = 35.5 grams
mass of copper = 63.5 grams

Based on this:
copper has the highest density.

The element that has maximum density at STP is copper.

Further explanation:

The property is a unique feature of the substance that differentiates it from the other substances. It is classified into two types:

1. Intensive properties:

These are the properties that depend on the nature of the substance. These don't depend on the size of the system. Their values remain unaltered even if the system is further divided into a number of subsystems. Temperature, refractive index, concentration, pressure, and density are some of the examples of intensive properties.

2. Extensive properties:

These are the properties that depend on the amount of the substance. These are additive in nature when a single system is divided into many subsystems. Mass, energy, size, weight, and length are some of the examples of extensive properties.

Density is a characteristic property of the substance. It is defined as the mass per unit volume. It is generally represented by $$\rho$$ .

The formula to calculate the density of the liquid is,

 \text{Density of liquid}(\rho)=\frac{\text{Mass of liquid(M)}}{\text{Volume of liquid (V)}}

Standard Temperature and Pressure is denoted as STP and the volume of 1 mole of gas at STP is 22.4 litres.  

The volume is constant and therefore density is directly related to mass.

Among the given elements copper has the highest molar mass and that is $$63.5\;{\text{g/mol}}$$ . Therefore the element that has maximum density at STP is copper.

Learn more:

1. Calculation of density: brainly.com/question/778841

2. Determine how many moles of water produce: brainly.com/question/1405182

Answer details:

Grade: Middle School

Subject: Chemistry

Chapter: Density

Keywords: density, mass, volume, STP, intensive, extensive, characteristic property, element, copper, chlorine, calcium, and carbon.

SELECT ALL THAT APPLYat STP conditions, 0.25 moles of CO2(g), H2(g), NH3(g)
1. Will contain the same number of molecules
2. Will contain the same number of atoms
3. Will occupy the same volume
4. Will have the same g.f.w

Answers

The answer is 1 and 3. The number of atoms per molecule of these three substance is not equal. So they will not contain same number of atoms. And for gas, under same condition with same number of moles will have the same volume. The g.f.w is related to the atomic mass. So they are different.

Answer:

1 and 3

Explanation:

Which statement explains why increasing thetemperature increases the rate of a chemical
reaction, while other conditions remain the same?
(1) The reacting particles have less energy and
collide less frequently.
(2) The reacting particles have less energy and
collide more frequently.
(3) The reacting particles have more energy and
collide less frequently.
(4) The reacting particles have more energy and
collide more frequently.

Answers

The answer is (4) the particles have more energy and collide more frequently.

propose a mathematical equation to calculate tje charge on an ion from the number of protons and electrons in an ion.

Answers

If the ion is a cation, it has a positive charge because it LOST electrons. If its an anion, then it has a negative electron because it GAINED electrons. 

A sample of vinegar has a pH of 5, and a sample of rainwater has a pH of 6. Which of the following statements best describes these two substances?A. Both samples are bases, and vinegar is more basic.
B. Both samples are acids, and vinegar is more acidic.
C. Both samples are bases, and rainwater is more basic.
D. Both samples are acids, and rainwater is more acidic.

Answers

Answer: The correct answer is option B.

Explanation:

pH is defined as negative logarithm of hydrogen ion concentration. It is basically defined as the power of hydrogen ions in a solution. It ranges to the scale of 1-14. The solutions are divided into 3 categories on the basis of the pH range:

  1. If the pH of the solution ranges from 1 to 6.9, the solution is said to be acidic. Less the pH, more the acidity of the solution.
  2. If the pH of the solution ranges from 7.1 to 14, the solution is said to be basic. More the pH, more the acidity of the solution.
  3. If the pH of the solution is 7, the solution is said to be a neutral solution.

We are given:

pH of vinegar = 5

pH of rainwater = 6

As, the pH of both the solutions is less than 7. Thus, both the solutions are acidic in nature and also pH of vinegar is less, so this solution will be more acidic in nature.

Hence, the correct answer is Option B.
Statement B correctly describes the situation.
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