Grade-10-science.docx

Summative Test in Grade 10 Science Name:___________________________________ Score: __________________ Name of Teacher: _________________________ Section:_________________ Instruction: Write the letter of the correct answer before the number. _________1. Chemical reactions _______________. A. Occur only in living things C. create and destroy atoms B. Produce new substances D. only occur outside living organisms _________2. What are the coefficients that will balance the skeleton equation? AlCl + NaOH Al(OH) NaCl A. 1,3,1,3 B. 3,1,3,1 C. 1,1,1,3 D. 1,3,3,1 _________3. In every balanced chemical equation, each side of the equation has the same number of ________. A. Atoms in each element B. molecules C. moles D. coefficients _________4. Which molecules are most closely related to lipids? A. nucleotides B. fatty acids C. amino acids D. sugars _________5. Which of the following molecules are classified as carbohydrates? A. nucleotides B. fatty acids C. amino acids D. sugars _________6. Polysaccharides are __________. A. lipids B. carbohydrates C. proteins D. nucleic acids _________7. Which molecules are most closely related to proteins? A. nucleotides B. fatty acids C. amino acids D. sugars _________8. Which of the following is not an example of matter? A. Air B. heat C. smoke D. water vapor _________9. When the equation Fe + Cl2 FeCl3 is balanced, what is the coefficient for Cl2 ? A. 1 B. 2 C. 3 D. 4 _________10. What are the missing coefficients for the skeleton equation below? Al2 (SO4 )3 (aq) KOH(aq) Al(OH)3 (aq) K2 SO4 (aq) A. 1,3,2,3 B. 2,12,4,6 C. 4,6,2,3 D. 1,6,2,3 _________11. The equation above is an example of what type of chemical reaction? A. combination B. decomposition C. single displacement D. double displacement _________12. The type of reaction that takes place when one element reacts with a compound to form a new compound and a different element is a _______ reaction. A. combination B. decomposition C. single displacement D. double displacement _________13. Which of the following is a balanced equation representing the decomposition of lead(IV) oxide? A. PbO C. Pb O 2Pb O Pb 2O B. PbO D. PbO Pb O Pb O _________14. Boyle's law states that ____. A. the volume of a gas varies inversely with pressure B. the volume of a gas varies directly with pressure C. the temperature of a gas varies inversely with pressure D. the temperature of a gas varies directly with pressure _________15. Charles's law states that ____. A. the pressure of a gas is inversely proportional to its temperature in kelvins B. the volume of a gas is directly proportional to its temperature in kelvins C. the pressure of a gas is directly proportional to its temperature in kelvins D. the volume of a gas is inversely proportional to its temperature in kelvins _________16. As the temperature of a fixed volume of a gas increases, the pressure will ____. A. Vary inversely B. decrease C. not change D. increase _________17. A chemical reaction is a process in which ; A. products change into reactants C. substances change state B. the law of conservation of mass applies D. all of these _________18. During a chemical reaction; A. new elements are produced C. atoms are destroyed B. atoms are rearranged D. elements are destroyed _________19. An equation is balanced by; A. changing subscripts C . erasing elements as necessary B. adding coefficients D. adding elements as necessary

_________20. What are the reactants in the following chemical equation: Zn + CuSO4 -----> ZnSO4 + Cu A. zinc and copper C. zinc and copper (II) sulfate B. zinc sulfate and copper D. only zinc _________21. What are the products in the above equation? A. zinc and copper C. zinc and copper (II) sulfate B. zinc sulfate and copper D. only zinc _________22. Boyle’s law involves which of the following? A. a direct proportion C. a constant pressure B. a constant volume D. a constant temperature _________23. Charles’s law involves which of the following? A. a direct proportion C. a constant pressure B. a constant volume D. a constant temperature _________24. Gay-Lussac’s law involves which of the following? A. a direct proportion C. a constant pressure B. a constant volume D. a constant temperature _________25. The general formula for the Combined Gas Law is ______________. A. V2P2T1 = V2P2T1 C. V1P1T2 = V1P2T1 B. V2P1T1 =V1P2T2 D. V1P1T2 = V2P2T1 Part II. Write the chemical equation for the following chemical reactions. Determine the type of reaction it undergoes. (3 pts each) 1. Hydrogen peroxide (H2O2) in the presence of manganese dioxide (MnO2) produces water (H2O) and oxygen gas (O2).

2. Magnesium chloride (MgCl2) is the product of a reaction between magnesium (Mg) and chlorine (Cl2).

Part III. Balance the following chemical reactions. (3 pts each) 1.

Zn +

H2SO4 ----->

2.

H2CO3 ----->

3.

CaCO3

+

ZnSO4 +

CO2

+

HCl ------>

H2

H2O

CaCl2

+ H2CO3