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- 1. Multiple Choice
How does a balanced chemical equation satisfy the Law of Conservation of Mass?
During a chemical reaction, the total amount of matter stays the same.
During a chemical reaction, matter is destroyed.
During a chemical reaction, one or more new substances are formed.
During a chemical reaction, the total number of atoms increases.
- 2. Multiple Choice
When 5 grams of silver nitrate are added to a 50 gram solution of potassium chloride, 2 grams of silver chloride form in the solution as a precipitate. After the reaction, the total mass of the solution is 55 grams. Which evidence from the experiment supports the law of conservation of mass?
The final mass of the product equals the mass of the reactants.
The final mass of the product is less than the mass of the reactants.
The mass of the precipitate is less than the amount of silver nitrate.
The mass of the precipitate is greater than the amount of silver nitrate.
- 3. Multiple Choice
A scientist placed a sample of lithium into a container of water. The scientist observed the lithium floating and making a buzzing sound as gas bubbles were forming around it. Which conclusion is BEST supported by this observation?
A chemical change took place.
The lithium was dissolved by the water.
Dissolved gases were released.
Water was vaporized.
- 4. Multiple Choice
Which statement best explains how the periodic table is organized?
increasing atomic number from left to right
increasing number of neutrons from left to right
decreasing number of electrons from left to right
decreasing atomic mass number from left to right
- 5. Multiple Choice
Where are the most reactive nonmetals located on the periodic table?
the uppermost complete row of the table
the rows at the bottom of the table connecting two sections
the column at the far left side of the table
the second column from the right side of the table
- 6. Multiple Choice
Mg(OH)2 is a compound. How many different elements are found in this compound?
1
2
3
4
- 7. Multiple ChoiceHow many Calcium atoms are in this compound?
Ca (OH)22314 - 8. Multiple ChoiceThe number of atoms of N (nitrogen) in 3N2O5 is25615
- 9. Multiple ChoiceFill in the blank to balance the chemical equation.
2KI + ____Cl2 → 2KCl + I21234 - 10. Multiple Choice
Which equation is balanced according to the Law of Conservation of Mass?
NaCl + Mg → MgCl2 + Na
2NaCl + Mg → MgCl2 + Na
2NaCl + Mg → MgCl2 + 2Na
- 11. Multiple Choice
A student mixed 10 grams of a powdery substance with 200 grams of an acid solution. A bubbly solution weighing 205 grams was formed. Which best explains why the mass of the new solution does not equal the mass of the reactants?
The other 5 grams changed color.
The other 5 grams created a precipitate.
The other 5 grams were released as a gas.
The other 5 grams weighed less in the acid.
- 12. Multiple ChoiceHow can mixtures best be described?made of one elementmade of different elements that are all chemically bonded togethermade of different elements that are not all chemically bonded together
- 13. Multiple ChoiceWhat do all the noble gases on the periodic table have in common?They are generally highly reactive.They are generally metalloids.They are generally unreactive.
- 14. Multiple Choice
The chemical formula for baking soda is NaHCO3. How many different elements make up baking soda?
1
2
3
4
- 15. Multiple ChoiceWhere are the most reactive metals located on the periodic table?the uppermost complete row of the tablethe rows at the bottom of the table connecting two sectionthe column at the far left side of the tablethe second column from the right side of the table
- 16. Multiple ChoiceWhich property is unique for each element?mass numberatomic numberstate of matter
- 17. Multiple ChoiceWhich best explains why the total mass of the product(s) would be less than the total weight of the reactant(s) after a chemical reaction?A physical change occurred.Atoms involved in the reaction lost mass.Precipitates were created in the new solution.Gases were released to the atmosphere.
- 18. Multiple ChoiceWhat coefficient for O2 demonstrates the law of conservation of mass?
CH4(g) + __O2(g) → CO2(g) + 2H2O(g)1234 - 19. Multiple ChoiceWhich is best represented by the equation?
2Mg + O2 → 2MgOLaw of Conservation of EnergyLaw of Conservation of MassLaw of Superposition - 20. Multiple Choice
Which best represents a balanced equation?
HgO --> Hg + O2
2Fe + O2 --> Fe2O3
2H2 + O2 --> 2H2O
- 21. Multiple Choice
3P + 5O2 ----> P410
Balanced Equation
Unbalanced Equation
- 22. Multiple ChoiceHow many nitrogen atoms does NH3 have?1234
- 23. Multiple ChoiceHow many Elements are in the compound C2H8O ?2130
- 24. Multiple ChoiceHow many total atoms are in the compound C2H8O ?11281
- 25. Multiple ChoiceHow many Chlorine are in MgCl2?213
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