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MARY > Grade 5 - Changes in Matter > Flashcards

Grade 5 - Changes in Matter Flashcards

1
Q

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

A

physical change

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2
Q

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

A

physical change

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3
Q

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

A

True.

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4
Q

A liquid turning into gas undergoes a process called ______.

A

evaporation

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5
Q

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

A

sublimation

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6
Q

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

A

deposition

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7
Q

Provide the following process for each corresponding physical change.

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

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
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8
Q

A new substance is formed when a _________ takes place.

A

chemical change

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9
Q

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

A

True

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10
Q

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

A

True

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11
Q

Give some examples or evidence that indicate chemical change.

A

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

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12
Q

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

A

True

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13
Q

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

A

True

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14
Q

The decomposition of substance due to heat is called ______.

A

thermal decomposition

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15
Q

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

A

thermal decomposition

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16
Q

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

A

oxidation.

17
Q

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.

A

Oxidation

18
Q

Give some examples of oxidation.

A

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

19
Q

Rust is formed by the reaction of?

A

iron (FE)
oxygen (O2)

20
Q

Iron and oxygen react and form a new substance called

A

iron oxide (rust)

21
Q

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

A

True

22
Q

Aerobic means?

A

air

23
Q

True or False: Aerobic respiration requires oxygen.

A

True

24
Q

The equation for aerobic respiration is.

A

glucose + oxygen -> carbon dioxide + water + energy

25
Q

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

A

Glucose

26
Q

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

A

True

27
Q

The mixture of acetic acid and water is commonly known as

A

vinegar

28
Q

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

A

True

29
Q

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

A

True

30
Q

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

A
  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.
31
Q

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

A

True

32
Q

Bacteria that require oxygen to grow are called _____.

A

aerobes

33
Q

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

A

anaerobes

34
Q

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

A

True

35
Q

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

A

oxidizing enzymes

36
Q

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.

A

True

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