2017 February Test – Science 10 [Chemistry & Physical Science]

Part I – Multiple Choice: Select and write the best answers to the left of the question/20

1)When sodium hydroxide reacts with hydrogen phosphate, which two products are formed?

a)NaOH and H2O

b)Na3PO4 and H2O

c)NaOH and H3PO4

d)Na3PO4 and P(OH)3

2)An atom of which of the following elements has the most unpaired electrons?

a)Neon

b)Boron

c)Fluorine

d)Hydrogen

3)Which of the following substances, when dissolved in rainwater, cause acid precipitation?

a)Alkali metals

b)Metal oxides

c)Non-metal oxides

d)Alkaline earth metals

4)What isotope has 25 protons and 29 neutrons?

a)Copper-25

b)Copper-54

c)Manganese-29

d)Manganese-54

5)What is the ion charge for neptunium in the compound Np2O5?

a)3+

b)4+

c)5+

d)6+

6)What particle is released when seaborgium-263 decays to rutherfordium-259?

a)A proton

b)A neutron

c)A beta particle

d)An alpha particle

7)What is the name for the compound CoSe?

a)Cobalt selenide

b)Cobalt(I) selenide

c)Cobalt(II) selenide

d)Cobalt monoselenide

8)Magnesium chloride reacts with sodium sulfide to produce magnesium sulphide andsodium chloride.What is the coefficient needed in front of sodium chloride to balance this reaction?

a)1

b)2

c)3

d)4

9)Cobalt-60, Co, undergoes beta decay. What is the daughter isotope in this nuclear reaction?

a) Fe

b)Mn

c) Ni

d) Co

10)What type of reaction would be expected when sodium phosphate reacts with calcium chloride?

a)Synthesis

b)Combustion

c)Decomposition

d)Double replacement

11)A sealed container contains 200g of radioactive iodine. After 24 days, the container has only 25g of radioactive iodine. What is the half-life of this isotope of iodine?

a)3 days

b)8 days

c)12 days

d)24 days

12)Which of the following compounds is inorganic?

a)NO2

b)C3H8

c)C6H12O6

d)CH3COOH

13)Which of the following compounds will conduct electricity and react with magnesium metal to produce hydrogen gas?

a)Sodium chloride

b)Hydrochloric acid

c)Calcium hydroxide

d)Sodium hydrogen carbonate

14)Which reaction occurs when an alpha particle is captured by a beryllium-9 nucleus?

a)Be + He C + n

b)Be + He C + n

c)Be + He C + n

d)Be + He C + n

15)How many unpaired electrons are present in a nitrogen atom?

a)2

b)3

c)5

d)7

16)Which of the following substances is most likely to cause blue litmus paper to turn red?

a)Soap

b)Table salt

c)Lemon juice

d)Oven cleaner

17)Which of the following formulae represents an ionic compound?

a)H2

b)NH3

c)CO32-

d)K2Cr2O7

18)What is the chemical formula for aluminum bicarbonate?

a)AlHCO3

b)Al3HCO3

c)Al2(CO3)3

d)Al(HCO3)3

19)Which of the following statements describe nuclear fusion?

I / Mass is converted into energy.
II / The reaction occurs in hydrogen bombs and in the Sun.
III / The process divides a nucleus into two or more fragments, releasingneutrons and energy.

a)I and II only

b)I and III only

c)II and III only

d)I, II, and III

20)Which indicator would be used to determine if a rainwater sample is acid rain with a pH less than 4.4?

a)Methyl orange

b)Indigo carmine

c)Phenolphthalein

d)Bromothymol blue

Part II – Fill in the Blanks/20

21)Balance the equations and determine the reaction type:

a)___ HBr + ___ Al(OH)3___H2O + ___AlBr3Reaction Type: ______

b)___C3H6O + ___O2 ___CO2 + ___H2O Reaction Type: ______

c)2P2O3 ______Reaction Type: ______

d)___ CaCO3___ CaO + ___ CO2Reaction Type: ______

e)___H2SO4 + ___Pb(OH)4___Pb(SO4)2 + ___H2OReaction Type: ______

22)A Se ion has the same number of electrons as a ______atom or ______alkali metal cation.

23)When an acid and base combines, the reaction is called a ______reaction, with ______and ______molecules are formed.

24)A ______reaction combines fuel and oxygen to produce ______and ______.

25)The atomic number of an element can tell us how many ______it has, which can be subtracted from the average mass to determine the number of ______.

Part III – Short Answers/20

26)Write the formulas/name the following compounds, and label C for covalent and I for ionic.

Chemical / Formula/Name / Ionic or Covalent
AgClO
Carbon chlorite
P4O10
Potassium selenide
MgCrO4
AuCr2O7
Silver bisulfite
Diiodinehexabromide
V4MnO4
Dichlorine monoxide

Part IV – Long Answers/20

27)Give an example of a strong acid and a weak base, and their applications to our daily lives.

28)Explain in detail the difference between an ion and an isotope.

29)Explain how a catalyst works, as well as why raising the temperature speeds up a reaction.

30)Discuss similarities and differences between covalent bonding and ionic bonding. Which is stronger, ionic bonding or covalent bonding? Explain.

31)In a combustion reaction, such as the example below, fuel is reacted with oxygen to produce carbon dioxide and water. However, we do not see liquid water produced during the reaction, so where did the H2O molecules go?