Jluyvg

An example of a physical change happens when:

a. Water is mixed with Nestea


b. Water is mixed with Alka seltzer

c. Iron is rusted by water

d. A paper is burnedWhich of the following is an example of a chemical change?

a. Slicing an apple


b. A rusting car

c. Freezing of water

d. Mixing eggs, butter and flour homogeneouslyWhich of the following sentences better describes the kinds and compositions of water on Earth?
a. Most of the Earth’s surface is covered with water, 70% of this water is salted while the rest,fresh water, can be found in the poles and glaciers, or liquid, in rivers, lakes, underground, etc.
b. About 70% of Earth’s surface is covered by water, most of it is accumulated under the groundas fossil water, but also a great part of it is salt water in the oceans, just a little part is fresh water
c. Most of the Earth’s surface is covered with water, 97% is salt water all the restis liquid fresh water found in lakes, rivers, the rain and under the ground mainly
d. About 70% of the Earth’s surface is covered with water, most of it is salt water, only 3% of the water onEarth is fresh, most of it is frozen in the glaciers and poles, only 1% of it is liquid

Which of the following sentences are true?

a. Dirty water can change into clean water trough the watercycle


b. The water we use at school is provided by the aqueduct

c. We have a lot of the water that we use the most
d. The water that we use more, is the one that we have lessWhich of the following sentences is correct to define Condensation?
a. The process by which liquid turns into solid
b. The process by which gas turns into liquid
c. The processby which liquid turns into gas

d. The process by which ice turns into vapour

Which of the following sentences is correct to describe Evaporation of water?

a. Happens at about 100ºC...