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WorksheetsNAT SCI 1 SEMI-FINAL EXAM
Total questions: 20
Worksheet time: 10mins
1. This represents with symbols and formulas, the identities and relative amounts of the reactants and products in a chemical reaction.
chemical formula
chemical reaction
chemical equation
chemical inventory
2. A solid produced by a chemical reaction.
slush
gel
aqueous solution
precipitate
3. Whole number that appears in front of a formula in a chemical equation. (Example: 6 in the following: 6 NaOH)
coefficient
superscript
catalyst
superscript
4. This symbol indicates_____________
reacts to yield
beware of sharp edges
a reversible reaction
reactivity increases with items to
5. This symbol indicates_____________
reacts to yield
beware of sharp edges
a reversible reaction
reactivity increases with items to
6. Fill in the blanks with coefficients to balance this equation:PCl5+___ H2O→____ HCl+H3PO4
4, 5
1, 6
3, 8
2,2
7. Balance this equation ___Zn +___HCl --> ____ZnCl2 + _____H2
1,1,2,1
1,1,1,2
1,2,1,1
2,1,1,1
8. Balance this equation. ___Mg + ___Cl2 --> ___MgCl2
1, 2,1
already balanced
2,1,1
1,1,2
9. Balance this equation ___N2 + ___H2 --> ___NH3
1,2,3
1,3,2
1,1,2
2,1,1
10. The blue numbers in the image below represent ________
Charges
coefficients
subscripts
none of the answers are correct
11. The symbol (g) found beside a chemical formula indicates that the chemical is ___________________.
stable in composition
instable in composition
in the gaseous state
an organic sugar
12. This symbol indicates ______________________.
heat is required for the reaction.
the reaction releases heat.
the reaction involves multiple steps
the reaction is a single step reaction
13. A chemical formula found on the arrow between the reactants and products in a chemical equation indicates the presence of a ________________________
catalyst
additional reactant
hazardous by product
secondary product
14. Which of the following elements are NOT diatomic?
Oxygen
Chlorine
Argon
Hydrogen
15. Iron, boron, and silicon are all _______________
diatomic
monatomic
nonmetals
metals
16. What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)? __Ca + __H2O --> __Ca(OH)2 + __H2
2,1 --> 2,1
1,2 --> 1,1
1,2 --> 2,4
1,2 --> 2,1
17. What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)? __CH4 + __O2 --> __CO2+ __H2O
2,1 --> 2,1
1,2 --> 1,1
1,2 --> 1,2
1,2 --> 2,1
18. Which side of a chemical equation is the reactant side?
Left (before the yields sign)
Right (after the yields sign)
19. Products are ___________
chemicals that are produced.
chemicals used for the reaction
20. Reactants are chemicals that are __________________.
reacted in the reaction
produced during a reaction
