_______ and _______ can both have two or more different atoms bonded together to form substances.
Question 8
00:25
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Required
2
Question 9
00:57
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Required
2
Question 10
10.
In physical changes, substances might change in _______ but not in composition.
Question 11
11.
Question 12
12.
Explain how either choice B or choice C makes the statement about the ending substance a TRUE statement. Use complete sentences when you write your response.
Question 13
13.
Required
2
Question 14
14.
How many atoms are part of this molecule?
Required
2
Explain how this chemical formulademonstrates how a chemical reaction has occurred.
Required
4
Question 16
16.
2
Question 18
18.
Does this model correctly show why the properties of the ending substances are different from the properties of the starting substances?Describe what could be correct or incorrect about his model.
Question 1
1.
What is the difference between a 'group' and a 'period' on the periodic table?
Question 2
2.
What does the atomic number tell you about an element?
Question 3
3.
Question 4
4.
Identify the element that has 20 protons in its nucleus using the periodic table.
Question 5
5.
What is the elemental symbol for Iron?
Question 6
6.
Question 8
8.
Which examples are Physical Changes?
Question 9
9.
What is the difference between a physical change and chemical change?
What happens to atoms after a chemical change?
They remain in the same place.
They lose energy.
They rearrange and link up in different ways.
They gain more energy.
Select ALL the options that demonstrate the physical properties of matter.
The state of matter.
The shape of the piece of matter.
The density of the matter.
The ability of the matter to burn or combust.
The fact the matter may be poisonous.
The ability of the matter to react with other chemicals.
The ability of the matter to dissolve in water.
Question 15
15.
What is the atomic number of the element - Oxygen?
Question 17
17.
Scientist Dmitri Mendeleev created the Periodic Table of Elements.
True
False
Select all the TRUE statements about molecules.
A: Molecules are two or more atoms chemically bonded together.
B: Molecules can have the same atoms or different atoms chemically bonded together.
C: Molecules can be unstable and combust.
D: Molecules can also be compounds if they have different elements chemically bonded together.
This chemical formula correctly demonstrates the Conservation of Matter Law, which states matter can't be created or destroyed. Matter can only be transformed through conservation through physical or chemical changes.
