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3 years ago

Which describes the Sahara?

Chemistry

2 answers:

Lana71 [14]3 years ago

4 0

A desert that covers the northern third of Africa. hope i helped:]

finlep [7]3 years ago

3 0

The correct answer is - a desert that covers the northern third of Africa.

Sahara is the biggest desert in the world. It occupies the northern third of the African continent, thus being the absolutely most dominant landscape feature in North Africa. It stretches from the Atlantic coast on the west, to the Red Sea coastline on the east, and from the plateaus of Central Africa, to near the coastline of the Mediterranean sea. It is a desert that has been a natural barrier for the movement and dispersal of people, animals and plants since its formation, with its vastness, lack of water, lack of food, sand storms, extreme heat.

You might be interested in

Xelga [282]

Answer:

Modern periodic law

Explanation:

There are many ways of stating the modern periodic law. Generally, the modern periodic law states that the properties of elements are a periodic function of their atomic numbers. That means, similar properties recur periodically when elements are arranged according to increasing atomic number.

Two scientists were largely responsible for our present day understanding of the modern periodic law, they are, Mendeleev and Moseley. Their work laid the foundation for the periodic table in its current form.

3 0

2 years ago

In a lab, silver nitrate,AgNO₃, is dissolved in water until no solid is observed in the container. Then, a solution of sodium ch

leva [86]

Answer:

The answer to your question is: A, C, E

Explanation:

After reading the information given, we can conclude that both reactants react to form a new solid product and another product that do not precipitate.

The reaction is:

AgNO₃ + NaCl ⇒ AgCl + NaNO₃

a. Formation of a solid indicates that a chemical reaction occurred This option is correct, precipitation indicates that a changed occurred in the solution due to a chemical reaction.

b. The initial disappearance of silver nitrate in water indicates a chemical reaction occurred No, what is happing is that silver nitrate is dissolving in water, this process is a physical change because matter do not change its nature.

c. The color change of the solution indicates a chemical reaction occurred This option is true, when a color appears suggest the formation of a new product.

d. A chemical reaction occurred when silver nitrate was added to water

This option is not correct, in this process silver nitrate is dissolving in water but it is not a chemical reaction because matter does not change is nature.

e. A chemical reaction occurred when the solutions were combined This option is true because silver nitrate and sodium chloride react to form a new product (solid formation and change in color).

f. The lack of temperature change indicates a chemical reaction didn't occur This is false, some reactions do not need a change of color to happen.

6 0

3 years ago

How many double bonds does CCL2H2 have?

galben [10]

None. Both chlorines and both hydrogens are single-bonded to the central carbon atom; the molecule is comprised of four single bonds and no double bonds.

Hope this helps!

4 0

2 years ago

Which physical property does the inventor need to consider when choosing a

adelina 88 [10]

Answer:

............

Explanation:

Ductility

6 0

3 years ago

The temperature and number of moles of a gas are held constant. Which of the following is true for the pressure of the gas?

Taya2010 [7]

Answer:

Pressure is inversely proportional to the volume of gas.

Explanation:

According to Boyle's law,

The volume of given amount of gas is inversely proportional to the pressure applied on gas at constant volume and number of moles of gas.

Mathematical expression:

P ∝ 1/ V

P = K/V

PV = K

when volume is changed from V1 to V2 and pressure from P1 to P2 then expression will be.

P1V1 = K P2V2 = K

P1V1 = P2V2

3 0

3 years ago