Multiple choice questions (1 Viewer)

[abbadell]

Can someone please do these so i can check my answers
<?xml:namespace prefix = v ns = "urn:schemas-microsoft-com:vml" /><v:line id=_x0000_s1026 style="Z-INDEX: 1; POSITION: absolute; mso-position-horizontal: absolute; mso-position-vertical: absolute" to="306pt,3.6pt" from="261pt,3.6pt"><v:stroke endarrow="block"></v:stroke></v:line><v:line id=_x0000_s1027 style="Z-INDEX: 2; POSITION: absolute; mso-position-horizontal: absolute; mso-position-vertical: absolute; flip: x" to="306pt,12.7pt" from="261pt,12.6pt"><v:stroke endarrow="block"></v:stroke></v:line>1 The Haber process.
What effect will an increase in temperature at constant pressure have?
(a) increase the N2 concentration
(b) increase the ammonia concentration
(c) lower the forward reaction rate
(d) lower the reverse reaction rate
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2 Excess production of sulfur dioxide gas could have serious long term effects on the environment. Which of the effects listed would be due to sulfur dioxide?
(a) Depletion of the ozone layer
(b) Global warming
(c) Acid rain
(d) Chemical warfare
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3 Cars more than 20 years old have engines that run at much lower temperatures than modern cars. Which of the following identifies the emissions from older cars that are less damaging, and those that are more damaging, than those from modern cars?
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<TABLE class=MsoTableGrid style="BORDER-RIGHT: medium none; BORDER-TOP: medium none; BORDER-LEFT: medium none; BORDER-BOTTOM: medium none; BORDER-COLLAPSE: collapse; mso-border-alt: solid windowtext .5pt; mso-yfti-tbllook: 480; mso-padding-alt: 0in 5.4pt 0in 5.4pt; mso-border-insideh: .5pt solid windowtext; mso-border-insidev: .5pt solid windowtext" cellSpacing=0 cellPadding=0 border=1><TBODY><TR style="mso-yfti-irow: 0"><TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0in; BORDER-LEFT: windowtext 1pt solid; WIDTH: 41.4pt; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt" vAlign=top width=55><O></O>

</TD><TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0in; BORDER-LEFT: #ece9d8; WIDTH: 2.75in; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt" vAlign=top width=264>Less damaging from older cars

</TD><TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0in; BORDER-LEFT: #ece9d8; WIDTH: 203.4pt; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt" vAlign=top width=271>More damaging from older cars

</TD></TR><TR style="mso-yfti-irow: 1"><TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0in; BORDER-LEFT: windowtext 1pt solid; WIDTH: 41.4pt; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" vAlign=top width=55>A

</TD><TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0in; BORDER-LEFT: #ece9d8; WIDTH: 2.75in; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" vAlign=top width=264>Nitrogen oxides

</TD><TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0in; BORDER-LEFT: #ece9d8; WIDTH: 203.4pt; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" vAlign=top width=271>Hydrocarbons

</TD></TR><TR style="mso-yfti-irow: 2"><TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0in; BORDER-LEFT: windowtext 1pt solid; WIDTH: 41.4pt; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" vAlign=top width=55>B

</TD><TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0in; BORDER-LEFT: #ece9d8; WIDTH: 2.75in; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" vAlign=top width=264>Sulfur dioxide

</TD><TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0in; BORDER-LEFT: #ece9d8; WIDTH: 203.4pt; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" vAlign=top width=271>Ozone

</TD></TR><TR style="mso-yfti-irow: 3"><TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0in; BORDER-LEFT: windowtext 1pt solid; WIDTH: 41.4pt; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" vAlign=top width=55>C

</TD><TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0in; BORDER-LEFT: #ece9d8; WIDTH: 2.75in; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" vAlign=top width=264>Hydrocarbons

</TD><TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0in; BORDER-LEFT: #ece9d8; WIDTH: 203.4pt; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" vAlign=top width=271>Nitrogen oxides

</TD></TR><TR style="mso-yfti-irow: 4; mso-yfti-lastrow: yes"><TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0in; BORDER-LEFT: windowtext 1pt solid; WIDTH: 41.4pt; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" vAlign=top width=55>D

</TD><TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0in; BORDER-LEFT: #ece9d8; WIDTH: 2.75in; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" vAlign=top width=264>Carbon dioxide

</TD><TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0in; BORDER-LEFT: #ece9d8; WIDTH: 203.4pt; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" vAlign=top width=271>Carbon monoxide

</TD></TR></TBODY></TABLE>
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4 Which is the best method of identifying metals such as lead or mercury in a sample?
(a) infra-red spectroscopy
(b) pH meter
(c) AAS
(d) chemiluminescence
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5 A student is given samples of 4 white solids, K2CO3, PbCl2, PbCO3 and AgNO3 labeled at random as W, X, Y and Z.
Substance W is soluble in water and gives off a gas when dilute hydrochloric acid is added. Substance X is soluble in water and its solution produces a precipitate when NaCl is added. Substance Y is insoluble in water but reacts with dilute hydrochloric acid, producing a gas. Identify substance Z.
(a) CaCO3
(b) K2CO3
(c) PbCl2
(d) AgNO3
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6 Where does energy that cause the greenhouse effect mainly come from?
(a) ozone absorbing UV radiation
(b) carbon dioxide absorbing infra-red radiation
(c) air absorbing visible light
(d) burning fossil fuels
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7 Which of the molecules below is a haloalkane?
(a) CH3CH2CH2F
(b) CH3COCH2CHBr
(c) ClCH2CH2COOH
(d) ICH2CH2OH
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8 For what reason is iron (III) chloride added to our water supply?
(a) to disinfect the water so that microbes don’t cause disease
(b) to harden teeth so they resist tooth decay
(c) to soften the water by removing magnesium and calcium ions
(d) to make colloidal mud to form particles big enough to filter

 

[tennille]

Why don't you tell us what you think the answer is, and we'll tell you whether they are correct?

 

[tennille]

For your first question, if you look at the graph below and apply Le Chatelier's Principle, you can work out the answer.

For your seond question, sulfur dioxide can rise to the atmosphere and combine with rain water:

SO2 (g) + H2O (l) --> H2SO3
H2SO3 (aq) + O2 (g) --> 2H2SO4 (aq)

Just revise your solubility rules for question 5.

What do you think is a haloalkane is? It's simply a halogen attached to an alkane. I'm sure you can work it out from there.

 

[Riviet]

1.

Spoiler

a

2.

Spoiler

c

4.

Spoiler

I'm pretty sure it's c

5.

Spoiler

Given X and W are both soluble, and using solubility rules, b and d are both soluble so we can eliminate these. Now the insoluble substance out of remaining two that produces a gas (substance Y) is choice a, therefore we are left with c as the answer.

7.

Spoiler

a

8.

Spoiler

I'm pretty sure it's c