FlexiQuiz - Chapter 2 Quiz

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In the term trace element, the modifier trace means;

a. The element is required in very small amounts.

c. The element is very rare on Earth.

d. The element enhances health but is not essential for the organism’s long-term survival

e. The elements passes rapidly through the organism

Compare with 31P( 31 phosphorus)the radioactive isotope 32P( 32 phosphorus) has;

a. A different atomic number.

b. One more neutron

c. One more proton.

d. One more electron.

e. A different charge

Atoms can be represent by simply listing the number of protons, neutrons, and electrons —for example, 2p+; 2n0; 2e- for helium. Which one of the following lists represents the 18O isotope of oxygen?

a. 6p+; 8n0; 6e-

b. 8p+; 10n0; 8e-

c. 9p+; 9n0; 9e-

d.7p+; 2n0; 9e-

e. 10p+; 8n0; 9e-

The atomic number of sulfur is 16. Sulfur combines with hydrogen by covalent bonding to form a compound, hydrogen sulfide. Based on the number of valence electrons in a sulfur atom, predict the molecular formula of the compound:

a. HS

b. HS2

c. H2S

d.H3S2

e.H4S

The reactivity of an atom arises from

a. The average distance of the outermost electron shell from the nucleus.

b. The existence of unpaired electrons in the valence shell.

c. The sum of the potential energies of all the electron shells.

d. The reaction is now irreversible.

e. No reactants remain.

Which types of chemical reactions occur faster at equilibrium, the formation of products from reactants, or reactants from products

a. The forward and reverse reactions occur at the same time.

b. The forward reaction occurs faster than the reverse reaction.

c. The reverse reaction occurs faster than the forward reaction.

d. The forward and reverse reactions do not change at all.

Is a trace element an essential element? Explain

a. No, because its only used in small amounts.

b. No, because the body can survive without it.

c. Yes, because its used in large amounts in the body.

d. Yes, because its required in small amounts in the body.

Which of the following statements correctly describes any chemical reaction that has reached equilibrium

a. The concentrations of the products and reactants are equal

b. The rates of the forward and reverse reactions are equal

c.Both forward and reverse reactions have halted.

d. The reaction is now irreversible

e. No reactants remain

What coefficients must be placed in the following blanks so that all atoms are accounted for the products?

a. 1;2

b. 2;2

c. 1;3

d. 1;3

c. 1;3

Which statement is the true of all atoms that are anions?

a. The atom has more electrons than protons.

b. The atom has more protons than electrons.

c. The atom has fewer protons than does a neutral atom of the same element.

d. The atom has more neutrons than protons.

e. The net charge is 1-.

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Chapter 2 Quiz

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