Welcome to your GRADE 7 GENERAL SCIENCE CHAPTER 3
After carefully reading the following 30 questions, choose the correct answer.
1.
Which law is applied to write balanced chemical equations?
2.
What represents the identity or kind of an element qualitatively?
3.
In the formula 3H2O, what does the coefficient "3" represent?
4.
What is the product of the synthesis reaction between nitrogen and hydrogen gas?
5.
Which gas is produced during the combustion of methane if oxidation is complete?
6.
What is the chemical formula for ammonium sulfate?
7.
In a chemical formula, what does a subscript written to the right of a symbol indicate?
8.
What are the three elements combined in magnesium carbonate?
9.
Which reaction produces liquid water from hydrogen and oxygen gases?
10.
What does the symbol "Fe" stand for?
11.
Which compound is represented by the formula NH4Cl?
12.
What is the qualitative meaning of the formula CaO?
13.
In the formula Ca(NO3)2, how many nitrate groups are present?
14.
What is the significance of the synthesis of ammonia?
15.
What is methane often described as in the context of greenhouse gases?
16.
How is the name of a compound containing polyatomic ions written?
17.
What does 2CO2 indicate quantitatively?
18.
Which four elements are combined in ammonium sulfate?
19.
What does a chemical symbol represent quantitatively?
20.
Which number in a formula indicates the number of molecules?
21.
Which compound is represented by NaHCO3?
22.
In the formula Al2(SO4)3, what is the name of the compound?
23.
What information is provided by symbols and formulas?
24.
Which compound is FeCl3?
25.
What does the symbol "O" represent?
26.
What is the product of complete methane oxidation besides water?
27.
In Cl2, what does the subscript 2 show quantitatively?
28.
Which catalyst-aided reaction requires high temperature and pressure to produce ammonia?
29.
What is the name of the polyatomic ion SO4?
30.
What indicates that an element is in molecular form in a formula?
