N/A — Exam Answers

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Which answer choice represents a balanced alpha emission nuclear equation?

A
26 to the 52th power Fe rightarrow 25 to the 52th power Mn plus plus 1 to the 0 power e
B
6 to the 14th power cap c rightarrow 7 to the 14th power cap n plus negative 1 to the 0 power e
C
92 to the 235th power cap u rightarrow 94 to the 239th power Pu plus 2 to the 4th power He
D
83 to the 189th power Bi rightarrow 81 to the 185th power Tl plus 2 to the 4th power He
43

Sodium hydroxide NaOH was added to pure water open paren cap h sub 2 cap o close paren Which most likely were the pH values of the water before and after the sodium hydroxide was added to it?

A
before is equal to 7 , after is equal to 9
B
before is equal to 9 , after is equal to 7
C
before is equal to 7 , after is equal to 4
D
before is equal to 4 , after is equal to 7
44

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

A
Both Newlands and Mendeleev organized elements into a table with rows and columns, but only Mendeleev named different groups of elements.
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 arranged elements according to their chemical properties, but only Newlands used atomic mass as well.
D
Both Newlands and Mendeleev organized elements into groups, but only Newlands used a table with rows and columns.
46

What is a main difference between a mixture and a pure substance?

A
A mixture looks the same throughout, but a pure substance does not.
B
A mixture is only a liquid, but a pure substance can be in any state.
C
A mixture can vary in composition, but a pure substance has a set composition.
D
A mixture can be made up of a single compound, but a pure substance cannot.
48

Which statement correctly describes compounds?

A
Compounds can be broken down into simpler substances by physical means.
B
Compounds cannot be broken down into simpler substances by chemical means.
C
Each compound is composed of one type of molecule.
D
Each compound is composed of one type of atom.
49

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 adding or removing neutrons
B
by adding valence electrons
C
by removing valence electrons
D
by adding or removing protons
50

Which best describes what is represented by images 1 and 2?

A
Image 1 shows a polymer, and Image 2 shows a monomer.
B
Image 1 shows a monomer, and Image 2 shows a polymer.
C
Image 1 shows a synthetic polymer, and Image 2 shows a macromolecule.
D
Image 1 shows a macromolecule, and Image 2 shows a synthetic polymer.

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