Chemistry Unit Review: Question Preview (ID: 30973)


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A medicine is a sleeping pill but if pregnant women take it, her fetus is a great risk to birth defects. Which statement is most accurate?
a) Fetuses have a low threshold level for this medicine
b) Fetuses have a high threshold level for this medicine
c) This medicine is a carcinogen in fetuses
d) This medicine is a pathogen in fetuses

What will most likely increase the rate of bubble formation?
a) Cooling the HCl
b) Diluting the HCl
c) Using powered zinc
d) Using less zinc

Why are elements in group 18 most likely called the noble gases?
a) They are named for the scientist who discovered them
b) They have complete valence shells
c) They are the only gaseous atoms found in nature
d) They form the most expensive compounds

What occurs in every chemical reaction?
a) Atoms are destroyed​
b) Atoms are rearranged
c) Elements are broken
d) Elements are created

Zinc is normally silver. After the experiment, the zinc was black. Why did the zinc turn black?
a) The metal was burned
b) New compounds formed during the reaction
c) The shiny surface was corroded away by the acid
d) A leftover residue stained the surface

A student pours hydrochloric acid into the flask and puts the zinc in a balloon, puts the balloon on the flask and lets the zinc fall into the flask. Bubbles form, the balloon expands and the flask heats up. Which of the following statements is true?
a) This is a physical change because the zinc and hydrochloric acid made gas.
b) This is a chemical change because the zinc and hydrochloric acid made gas.
c) This is a chemical change because there was a precipitate formed in the way of gas.
d) Bubbles forming is an example of a physical change.

Triclosan and bleach kill bacteria. Why is only Triclosan in hand soap?
a) Triclosan is a color enhancer
b) Triclosan is a less harsh chemical
c) Triclosan contain fragrance
d) Triclosan moisturizes skin

What is the charge of just the nucleus of an atom?
a) Neutral; neutrons are present
b) Neutral; equal number of electrons and protons
c) Positive; equal number of electrons and neutrons
d) Positive; protons are present

Why is copper most likely used more often than gold in electrical wiring?
a) Copper is less ductile
b) Copper has a lower density
c) Copper is a better conductor
d) Copper has a higher specific heat

Which best describes a solution?
a) Compound; can be separated by physical means
b) Compound; can be separated by chemical means
c) Mixture; can be separated by chemical means
d) Mixture; can be separated by physical means

Which element is most likely germanium (Ge)?
a) Carbon
b) Hydrogen
c) Iron
d) Boron

Why is Carbon MOST like germanium (Ge)?
a) Carbon is found in the same period as germanium
b) Carbon is found in the same faimly/group as germanium
c) Carbon and germanium have the same number of valence electrons
d) Carbon and germanium have the same number of neutrons

Insecticides kill insects and may affect human health. Why are they most likely still used?
a) Their found in nature
b) They increase crop yields
c) They reduce resistance to fungi
d) They are easily removed from food

How do covalent bonds form?
a) Atoms share protons
b) Atoms share electrons
c) Atoms gain or lose electrons
d) Atoms gain or lose protons

Which atomic properties best describe an atom of cobalt (Co)?
a) 27 protons, 27 electrons, 27 neutrons
b) 27 protons, 27 electrons, 32 neutrons
c) 58.93 protons, 27 electrons, 27 neutrons
d) 59 protons, 27 electrons, 31.93 neutrons

Na is a highly reactive metal, Cl is a poisonous gas, table salt is made of both. Why is table salt safe to eat?
a) One element is an acid and the other a base
b) When elements combine, they produce a mixture
c) When elements form compounds, their chemical properties change
d) One element’s electrons balance out the other’s electrons

Which is the best describes the result of a chemical reaction?
a) Heat is always released
b) Heat is always absorbed
c) The mass of the reactants is equal to the mass of the products
d) The mass of the product is greater than the mass of the reactant

What do we have to know about an element to reproduce it synthetically?
a) Chemical formula of the substance
b) Solubility of the substance in water
c) Who discovered the substance
d) Where the substance is found

Which is an indicator of a chemical reaction?
a) Change in mass
b) Change in shape
c) Change in size
d) Change in temperature

What does the number above the symbol for each element represent?
a) # of neutrons in an atom
b) # of protons in an atom
c) The sum of protons and neutrons in an atom
d) The sum of protons and electrons in an atom

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