20 questions
How many carbon atoms are there in this molecule?
6
12
18
24
How many hydrogen atoms are there in this molecule?
6
12
18
24
How many oxygen atoms are there in this molecule?
6
12
18
24
What is the chemical formula for this molecule?
Which model shows a balanced equation?
a.
b.
c.
d.
water
Si
water
oxygen
water
How many Hydrogen atoms are in NaCHCO3
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
2
3
5
6
1
2
3
6
8
6
4
2
8
6
4
2
Which of the following is the best evidence for a chemical reaction?
gas bubbles
change in temperature
change in state
formation of a new substance