CHEMISTRY MIDDLE SCHOOL

What is the relationship between accuracy and precision? Please use at least 2 complete content related sentences.

Answers

Answer 1

Answer:

Answer:

im wondering how you 45 and in middle school

Explanation:

but im also trying to find out this answer sooo

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Which particle of the atom has no charge? A.
nucleus

B.
electron

C.
neutron

D.
proton

Answers

C, the neutron is the answer!

C. Neutron

Has no charge.

Once heat from the Sun penetrates the Earth's atmosphere, the heat is circulated as warm air rises and cold air sinks. What is this process called?1. convection
2. radiation
3. reflection
4. conduction

Answers

Heat from the sun is radiated to the surface of earth. The circulation of heat through the atmosphere of earth is taken place by the process called convection.

What is heat transfer?

Heat will transfer from regions of greater heat to regions of less heat. The mode of heat transfer in different states of matter. The heat transfer mode in solids is called conduction.

The closely packed molecules in solids transfers the heat throughout the chain of the molecules by conduction. The heat transfer mode in fluids that's in air and liquids is called convection, where the hotest molecules from the ground rises to the top making the molecules in its path hot.

Radiation is the heat transfer mode in vacuum. Electromagnetic waves and heat energy are transferred to surface of earth by radiation. Therefore, the radiated heat energy is circulated throughout the earth's atmosphere is convection.

To know more on convection, refer here:

brainly.com/question/16635311

#SPJ2

Once heat from the sun penetrate the Earths atmosphere, the heat is circulated as warm air rises and cold air sinks,this process is called convection Convection can be demonstrated by placing a heat source {cooker} at the side of a glass full of a liquid, and observing the changes in temperature in the glass caused by the warmer fluid moving into cooler areas

How does the modern periodic table arrange elements?A.
by atomic mass

B.
by atomic number

C.
by number of isotopes

D.
by electron mass

Answers

Answer:

B. By atomic number.

Explanation:

The atom is the most basic unit of matter with properties of a chemical element. The atom is the fundamental component of all matter. All atoms are made up of a central nucleus in which there are positively charged particles, the protons, around which other negatively charged particles, the electrons, move. The nucleus of the atom also has neutrons, which have a neutral charge.

The atomic number, which is represented by the letter Z, indicates the number of protons that are present in the nucleus of an atom. Determine the identity of an atom and its properties.

The atomic number is used to classify the elements within the periodic table of the elements.

By increasing atomic number

Why does the dilution equation, M 1 V 1 = M 2 V 2, work?a) The dilution equation works because the mass remains the same.
b) The dilution equation works because the molarity remains the same.
c) The dilution equation works because the volume remains the same.
d) The dilution equation works because the number of moles remains the same.

Answers

Answer:

d) The dilution equation works because the number of moles remains the same.

Explanation:

Let’s say that you have 1 mol of a solute in I L of solution. The concentration is 1 mol·L⁻¹. and M₁V₁ = 1 mol.

Now, you dilute the solution to a volume of 2 L. You still have 1 mol of solute, but in 2 L of solution. The new concentration is 0.5 mol·L⁻¹.

The volume has doubled, but the volume has halved, and M₂V₂ = 1 mol.

b) Wrong. The molar concentration changes on dilution.

c) Wrong. The volume changes on dilution.

a) Wrong, although technically correct, because if the moles don’t change, the mass doesn’t change either. However, the formula M₁V₁ has units mol·L⁻¹ × L = mol. Thus, in the formula, it is moles that are constant.

The dilution equation work M1V1 =M2V2 work because the number of moles of solute remains the same.

Further Explanation:

Dilution

Dilution refers to the addition of solvent such as water to a solution. When dilution is done the amount of solute is not affected but the amount of solvent increases while the concentration decreases.

Concentration

It is the opposite of dilution where by a solvent is removed from a solution thereby increasing the concentration of the solute.

Dilution equation.

The dilution equation is given by;

M1V1=M2V2

Where M1 is the initial concentration of the solution

V1 is the initial volume of the solution

M1 is the concentration of the new solution

V1 is the volume of the new volume

Initial solution

The initial solution before dilution is called the stock solution. It is the solution before dilution process is done.

Final solution

Final solution is called the diluted solution. It is the solution obtained after the process of dilution.

Since dilution involves addition of solvent, then the amount of solvent in this case water increases , the amount of solute remains constant while the concentration of solute decreases.

Keywords: Dilution, dilution equation, stock solution, diluted solution.