Grade 5 - Changes in Matter

Question 1

A change that affects only the physical properties of matter is called ______.

Answer 1

physical change

Question 2

A change in the phase or state of matter is another example of ________.

Answer 2

physical change

Question 3

True or False: A change in phase may occur when heat is added or removed from a substance.

Answer 3

True.

Question 4

A liquid turning into gas undergoes a process called ______.

Answer 4

evaporation

Question 5

When heated, some solids turn directly into gas without passing through the liquid phase. This process is called _______.

Answer 5

sublimation

Question 6

When some gases cool down, they can turn directly into solids through a process called ________.

Answer 6

deposition

Question 7

Provide the following process for each corresponding physical change.

1. Melting
2. Freezing
3. Evaporation
4. Condensation
5. Deposition
6. Sublimation

Answer 7

Process:

1. Melting - Solid to liquid
2. Freezing - Liquid to solid
3. Evaporation- Liquid to gas
4. Condensation - Gas to liquid
5. Deposition - Gas to solid
6. Sublimation - Solid to gas

Question 8

A new substance is formed when a _________ takes place.

Answer 8

chemical change

Question 9

True or False: The composition of matter is altered when a chemical change takes place.

Answer 9

True

Question 10

True or False: A chemical change may happen in the presence or absence of oxygen or with the application of heat.

Answer 10

True

Question 11

Give some examples or evidence that indicate chemical change.

Answer 11

Changes in color, taste, and smell.
The release of light and heat.
The formation of gas.

Question 12

True or False: Chemical change may be hastened or slowed down by changes in temperature.

Answer 12

True

Question 13

True or False: Heat can cause some substances to decompose and form new substances.

Answer 13

True

Question 14

The decomposition of substance due to heat is called ______.

Answer 14

thermal decomposition

Question 15

It is a form of chemical change or reaction that involves heating and breaking down of a complex substance into two or more simpler substances

Answer 15

thermal decomposition

Question 16

The changes in the appearance of iron and some fruits are due to _______.

Answer 16

oxidation.

Question 17

Refers to any process in which oxygen combines with an element or substance, either slowly as in the rusting of iron, or rapidly, as in the burning of paper.

Answer 17

Oxidation

Question 18

Give some examples of oxidation.

Answer 18

Rust formation
Aerobic respiration
Production of vinegar
Browning of fruits
Food spoilage

Question 19

Rust is formed by the reaction of?

Answer 19

iron (FE)
oxygen (O2)

Question 20

Iron and oxygen react and form a new substance called

Answer 20

iron oxide (rust)

Question 21

True or False: Iron and oxygen have characteristics and properties that are different from those of rust.

Answer 21

True

Question 22

Aerobic means?

Answer 22

air

Question 23

True or False: Aerobic respiration requires oxygen.

Answer 23

True

Question 24

The equation for aerobic respiration is.

Answer 24

glucose + oxygen -> carbon dioxide + water + energy

Question 25

Is the simplest form of sugar that we get from the food that we eat.

Answer 25

Glucose

Question 26

True or False: Vinegar may be prepared from any fruit juice that contains sugar (glucose).

Answer 26

True

Question 27

The mixture of acetic acid and water is commonly known as

Answer 27

vinegar

Question 28

True or False: Acetic acid is what gives vinegar its sour taste.

Answer 28

True

Question 29

True or False: Food such as apples, pears, potatoes, and bananas turn brown when exposed to air.

Answer 29

True

Question 30

Give some examples of slowing down the oxidation process of food (apples, pears, potatoes or bananas)?

Answer 30

1. Refrigerate fruits and vegetables or place them in ice water after cutting them. 2. By cooking 3. Adding a small amount of lemon juice or calamansi juice to the fruit to make it acidic can also slow down the oxidation process.

Question 31

True or False: Chemical change in food spoilage is accompanied by the formation of bubbles, discoloration, foul odor and unpleasant taste.

Answer 31

True

Question 32

Bacteria that require oxygen to grow are called _____.

Answer 32

aerobes

Question 33

Bacteria that can only grow in the absence of oxygen are called ______.

Answer 33

anaerobes

Question 34

True or False: Molds and most yeasts are aerobes that cause food to spoil.

Answer 34

True

Question 35

Certain enzymes that are naturally present in food are called _____.

Answer 35

oxidizing enzymes

Question 36

True or False: Spontaneous reaction of oxygen with fats in foods also causes the formation of substances with unpleasant strong odors and flavors. This may cause illnesses such as diarrhea, nausea, or vomiting.

Answer 36

True