Answers2526 SEM 1 2003310 Physical Science NEWCumulative Exam

Cumulative Exam — Cumulative exam Answers

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Which element is most likely to carry electric current easily?

A
tin (Sn)
B
sulfur (S)
C
antimony (Sb)
D
selenium (Se)
22
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When balanced, which equation would have the coefficient 3 in front of any of the reactants?

A
Zn + HCl ZnCl2 + H2
Option A
B
H2SO4 + B(OH)3 B2(SO4)3 + H2O
Option B
C
Fe + AgNO3 Fe(NO3)2 + Ag
Option C
D
C2H4O2 + O2 CO2 +H2O
Option D
23

best

T
The atoms in hydrogen peroxide are breaking apart and forming new types of molecules.
T
The atoms in hydrogen peroxide are breaking apart and recombining into the original molecules.
T
The molecules of hydrogen peroxide remain intact as new types of molecules form and move out of the liquid.
T
The molecules of hydrogen peroxide remain intact but move more quickly to allow evaporation.
24

Which example illustrates a chemical change?

s
shredding paper
s
smashing a soda can
b
burning wood
c
chopping wood
25

Scientists often work on projects for a long time and fail to see sources of error in their research. Which process allows an outside expert to look at the scientist’s project and point to sources of error?

A
direct funding
B
peer review
C
conclusive research
D
data collection

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