Answers2526 SEM 1 2003310 Physical Science NEWCumulative Exam

Cumulative Exam — Cumulative exam Answers

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Which ingredient would a company that makes super-sour candy most likely use in large quantities?

A
nitric acid
B
zinc hydroxide
C
citric acid
D
calcium hydroxide
42
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Which statement best describes one positive and one negative way that society was impacted by the use of DDT?

A
Society was positively impacted by increased insect control in crops, but it was negatively impacted by harmful chemicals.
B
Society was positively impacted by insect resistance, but it was negatively impacted by harmful chemicals.
C
Society was positively impacted by increased insect control in crops, but it was negatively impacted by malaria and typhus.
D
Society was positively impacted by insect resistance, but it was negatively impacted by malaria and typhus.
43

This table shows the pH values of different solutions.

Question illustration
A
W X Y Z
Option A
B
Y W X Z
Option B
C
W X Z Y
Option C
D
Y Z X W
Option D
44

A researcher is using a particle accelerator in an experiment studying isotopes. How can the researcher change one isotope into a different isotope of the same element?

A
by removing valence electrons
B
by adding valence electrons
C
by adding or removing protons
D
by adding or removing neutrons
45

At the center, 6 unmarked red balls are interspersed with 4 blue balls marked with plus signs. A green cloud with 2 concentric white lines surrounds the center, with 2 small green balls marked with minus signs on the inner white line and 2 small green balls marked with minus signs on the outer white line.

Question illustration
A
4
B
6
C
10
D
14
46

Which best compares and contrasts how John Newlands and Dmitri Mendeleev organized elements?

A
Both Newlands and Mendeleev arranged elements according to their chemical properties, but only Newlands used atomic mass as well.
B
Both Newlands and Mendeleev arranged elements according to their atomic masses, but only Mendeleev used chemical properties as well.
C
Both Newlands and Mendeleev organized elements into groups, but only Newlands used a table with rows and columns.
D
Both Newlands and Mendeleev organized elements into a table with rows and columns, but only Mendeleev named different groups of elements.
47

When a hammer strikes a compound formed by covalent bonds, what will most likely happen to the compound?

A
It will break into many pieces.
B
It will reform into a new shape.
C
It will spread out and then return to its original shape.
D
It will stay solid and resist the force of the hammer.
48

This is how platinum appears in the periodic table.

Question illustration
A
78
B
117
C
195
D
273
49

Which best describes a semiconductor?

A
Semiconductors are more conductive than a nonmetal and less conductive than a metal.
B
Semiconductors are more conductive than a nonmetal and less conductive than a metalloid.
C
Semiconductors have a high electrical conductivity.
D
Semiconductors have a no electrical conductivity.
50

This chart lists four elements from the periodic table.Atoms from which two elements would form ionic bonds?

Question illustration
A
calcium and gold
B
gold and argon
C
argon and iodine
D
iodine and calcium
51

Which statement best describes the equation CaCO3 + 2HCl → CaCl2 + CO2 + H2O?

A
CaCO3 is a reactant; it is present before the reaction occurs.
B
CaCl2 is a reactant; it is present before the reaction occurs.
C
CO2 is a reactant because it is most likely a gas.
D
H2O is a reactant because it is most likely a liquid.
52

Which is the balanced equation for S8 + O2 → SO2?

A
S8 + O16 → 8SO2
B
S8 + O2 → S8 + O2
C
S8 + O2 → S8O2
D
S8 + 8O2 → 8SO2
53

Hsaio manages the finances for her company and has a particularly large amount of money budgeted for the purchase of calcium chloride, or CaCl2. Which type of company does Hsaio most likely own?

A
a snow-plowing service
B
a cosmetics factory
C
a pottery art studio
D
a catering business
54

Sodium hydroxide (NaOH) was added to pure water (H2O). Which most likely were the pH values of the water before and after the sodium hydroxide was added to it?

A
before = 7, after = 9
B
before = 7, after = 4
C
before = 4, after = 7
D
before = 9, after = 7

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