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Chapter 2 sections 1 and 2

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Biology Test # 2

Questão 1 de 24

1

The space surrounding the nucleus of an atom contains

Selecione uma das seguintes:

  • electrons

  • neutrons

  • ions

  • protons

Explicação

Questão 2 de 24

1

Which of the following is a use of radioactive isotopes?

Selecione uma das seguintes:

  • can determine the ages of rocks and fossils

  • used as "tracers" to follow the movements of substances within organisms

  • can be used to treat cancer and kill bacteria that cause food to spoil

  • all of the above

Explicação

Questão 3 de 24

1

Which of the following makes up a molecule of water?

Selecione uma das seguintes:

  • one atom of hydrogen and one atom of oxygen

  • two atoms of hydrogen and one atom of oxygen

  • one atom of hydrogen and two atoms of oxygen

  • one atom of sodium and one atom of chlorine

Explicação

Questão 4 de 24

1

Which of the following statements about a compound is true?

Selecione uma das seguintes:

  • Only the chemical properties of a compound are usually the same as those of the elements from which it is formed.

  • The physical and chemical properties of a compound are usually very different from those of the elements from which it is formed.

  • Only the physical properties of a compound are usually the same as those of the elements from which it is formed.

  • The physical and chemical properties of a compound are usually the same as those of the elements from which it is formed.

Explicação

Questão 5 de 24

1

What type of electron is available to form bonds?

Selecione uma das seguintes:

  • covalent

  • nucleus

  • valence

  • ionic

Explicação

Questão 6 de 24

1

What type of ion forms when an atom loses electrons?

Selecione uma das seguintes:

  • positive

  • possibly positive or negative

  • neutral

  • negative

Explicação

Questão 7 de 24

1

The most abundant compound in most living things is

Selecione uma das seguintes:

  • sodium chloride

  • water

  • sugar

  • carbon dioxide

Explicação

Questão 8 de 24

1

When salt is dissolved in water, water is the

Selecione uma das seguintes:

  • solute

  • solution

  • reactant

  • solvent

Explicação

Questão 9 de 24

1

A substance with a pH of 6 is called

Selecione uma das seguintes:

  • neither an acid nor a base

  • an acid

  • both an acid and a base

  • a base

Explicação

Questão 10 de 24

1

The three particles that make up an atom are

Selecione uma das seguintes:

  • neutrons, isotopes and electrons

  • protons, neutrons and isotopes

  • protons, neutrons and electrons

  • positives, negatives and electrons

Explicação

Questão 11 de 24

1

The nucleus is made of

Selecione uma das seguintes:

  • protons, neutrons and electrons

  • electrons and neutrons

  • protons and neutrons

  • protons and electrons

Explicação

Questão 12 de 24

1

Isotopes are atoms of the same element with the same number of protons and

Selecione uma das seguintes:

  • the same number of neutrons

  • a different number of molecules

  • a different number of neutrons

  • a different number of electrons

Explicação

Questão 13 de 24

1

Which of the following terms describes a substance formed by the combination of two or more elements in definite proportions?

Selecione uma das seguintes:

  • isotope

  • compound

  • enzyme

  • nucleus

Explicação

Questão 14 de 24

1

Water molecules are polar, with

Selecione uma das seguintes:

  • the oxygen side being slightly negative and the hydrogen side being slightly positive

  • the oxygen and hydrogen sides being slightly positive

  • the oxygen side being slightly positive and the hydrogen side being slightly negative

  • the oxygen and hydrogen sides being slightly negative

Explicação

Questão 15 de 24

1

A solution is a(an)

Selecione uma das seguintes:

  • evenly distributed mixture of two or more substances

  • combination of two or more liquids

  • chemical reaction

  • breaking of a chemical bond

Explicação

Questão 16 de 24

1

The word "atom" comes from the Greek "atomos" and the Greek word literally means

Selecione uma das seguintes:

  • to spray a mist

  • nucleus

  • cannot be cut

  • dog particle

Explicação

Questão 17 de 24

1

The atomic nucleus of Helium is made of

Selecione uma das seguintes:

  • only neutrons

  • protons and neutrons

  • electrons and protons

  • only protons

Explicação

Questão 18 de 24

1

Carbon-14 weighs 14 AMUs. Since Carbon has 6 protons, Carbon-14 must have

Selecione uma das seguintes:

  • 7 neutrons

  • 6 neutrons

  • 8 neutrons

  • 14 neutrons

Explicação

Questão 19 de 24

1

Oxygen has 8 protons, therefore Oxygen atoms will normally have

Selecione uma das seguintes:

  • 14 neutrons

  • 8 electrons around it

  • 6 neutrons

  • atomic mass of 8

Explicação

Questão 20 de 24

1

An isotope always has

Selecione uma das seguintes:

  • same number of protons, different neutrons

  • same number of neutrons, different protons

  • same number of neutrons, different number of electrons

  • same number of protons and neutrons

Explicação

Questão 21 de 24

1

Molecules made by SHARING electrons have bonds that are

Selecione uma das seguintes:

  • metallic

  • hydrogenic

  • covalent

  • ionic

Explicação

Questão 22 de 24

1

According to your reading assignment, the forces that bond two separate molecules together are called _______ forces.

Selecione uma das seguintes:

  • Van Halen

  • ionic

  • van der Waals

  • intramolecular

Explicação

Questão 23 de 24

1

According to your textbook, if an element steals an electron from a weaker element making them both charged particles that attract each other because of opposite charges, this bonding between the elements is called _________ bonding.

Selecione uma das seguintes:

  • ionic

  • covalent

  • Van Halen

  • molecular

Explicação

Questão 24 de 24

1

Oxygen atoms are non-metals. Which of the following is NOT true of Oxygen?

Selecione uma das seguintes:

  • It has 2 openings in valence

  • It has only 6 protons in its nucleus

  • It bonds ionically with reactive metals

  • It bonds covalently with hydrogen

Explicação

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