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Matter Molecules and Elements
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Matter Molecules and Elements
Matter Molecules and Elements
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1
Question
What is matter according to the provided material?
Answer
Anything that has mass and occupies space.
2
Question
What example is given for matter?
Answer
Water.
3
Question
What happens when water is repeatedly divided into smaller droplets?
Answer
It reaches a speck so small that further division loses its substance, called a molecule.
4
Question
Define a molecule according to the material.
Answer
The smallest indivisible particle of matter that can be obtained without losing its previous substance.
5
Question
What occurs if a water molecule is further broken down?
Answer
It splits into two gases: oxygen and hydrogen, no longer retaining original form.
6
Question
What are the two gases from a water molecule called?
Answer
Atoms.
7
Question
How is water's atomic composition described?
Answer
H2O: two atoms of hydrogen and one atom of oxygen.
8
Question
What atoms make up wood according to the text?
Answer
Carbon, hydrogen, and oxygen.
9
Question
How many different kinds of atoms are there?
Answer
About one hundred [100], all called elements.
10
Question
How many elements make up the human body?
Answer
Fifteen [15].
11
Question
How many elements are found in large quantities in the human body?
Answer
Six [6].
12
Question
What percentage of the human body is carbon?
Answer
18%.
13
Question
What is the hydrogen percentage in the human body?
Answer
10%.
14
Question
What percentage does oxygen constitute in the human body?
Answer
65%.
15
Question
What is nitrogen's percentage in the human body?
Answer
3%.
16
Question
What percentage of the human body is calcium?
Answer
2%.
17
Question
What is the phosphorus percentage in the human body?
Answer
1%.
18
Question
What is the total percentage of the six major elements in the human body?
Answer
99%.
19
Question
Define a compound from the material.
Answer
Substance or matter chemically broken down into two or more particles.
20
Question
What is an element according to the text?
Answer
Substance that cannot be broken down any further.
21
Question
Give an example of a compound and elements from the text.
Answer
Water is a compound; oxygen and hydrogen are elements.
22
Question
What do atoms do under certain conditions?
Answer
Break down and shoot out smaller particles called electrons.
23
Question
How does the material describe the process leading to a molecule of water?
Answer
By dividing water into droplets again and again until indivisible speck.
24
Question
Why does further division of a water molecule change its form?
Answer
It splits into oxygen and hydrogen gases, losing original substance.
25
Question
What distinguishes water's atoms from wood's?
Answer
Water has two kinds (H, O); wood has three (C, H, O).
26
Question
Why are all different kinds of atoms called elements?
Answer
There are about 100 such kinds, each cannot be broken further.
27
Question
How do the six major body elements differ from the other nine?
Answer
Found in large quantities, totaling 99%; others trace.
28
Question
What role does oxygen play in human body composition?
Answer
65%, largest share among elements.
29
Question
How do compounds differ from elements chemically?
Answer
Compounds break into two or more particles; elements do not.
30
Question
Why is water classified as a compound?
Answer
Chemically broken down into oxygen and hydrogen particles.