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Quiz on CHEMISTRY I: ATOMS AND MOLECULES, created by anabelen on 20/05/2014.

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CHEMISTRY I: ATOMS AND MOLECULES

Question 1 of 20

1

Energy is the capacity to do work

Select one of the following:

  • True
  • False

Explanation

Question 2 of 20

1

The neutron also is located in the atomic nucleus

Select one of the following:

  • True
  • False

Explanation

Question 3 of 20

1

The neutron has no charge, and a mass of slightly over 1 amu

Select one of the following:

  • True
  • False

Explanation

Question 4 of 20

1

The electron is a very small particle located in the nucleus.

Select one of the following:

  • True
  • False

Explanation

Question 5 of 20

1

The atomic number is the number of protons and neutrons an atom has

Select one of the following:

  • True
  • False

Explanation

Question 6 of 20

1

Isotopes are also the source of radiation used in medical diagnostic and treatment procedures.

Select one of the following:

  • True
  • False

Explanation

Question 7 of 20

1

Carbon has three isotopes, of which carbon-12 and carbon-14 are the most well known

Select one of the following:

  • True
  • False

Explanation

Question 8 of 20

1

Molecules are the smallest particle into which an element can be divided.

Select one of the following:

  • True
  • False

Explanation

Question 9 of 20

1

An orbital is also an area of space in which an electron will be found 10% of the time.

Select one of the following:

  • True
  • False

Explanation

Question 10 of 20

1

The major energy levels into which electrons fit, are (from the nucleus outward) K, L, M, and N. Sometimes these are numbered, with electron configurations being: 1s22s22p1, (where the first shell K is indicated with the number 1, the second shell L with the number 2, etc.).

Select one of the following:

  • True
  • False

Explanation

Question 11 of 20

1

Ionic bonds are destroyed when atoms become ions by gaining or losing electrons

Select one of the following:

  • True
  • False

Explanation

Question 12 of 20

1

Covalent bonds form when atoms share electrons.

Select one of the following:

  • True
  • False

Explanation

Question 13 of 20

1

Formation of covalent bonds in methane. Carbon needs to share five electrons, in effect it has four slots. Each hydrogen provides an electron to each of these slots.

Select one of the following:

  • True
  • False

Explanation

Question 14 of 20

1

The molecule methane (chemical formula CH4) has four covalent bonds, one between Carbon and each of the four Hydrogens

Select one of the following:

  • True
  • False

Explanation

Question 15 of 20

1

Chemical reactions don't occur in nature, and some also can be performed in a laboratory setting.

Select one of the following:

  • True
  • False

Explanation

Question 16 of 20

1

The water molecule is thus polar, having positive and negative sides

Select one of the following:

  • True
  • False

Explanation

Question 17 of 20

1

Formation of a crystal of sodium chloride: Each positively charged sodium ion is surropunded by seven negatively charged chloride ions;

Select one of the following:

  • True
  • False

Explanation

Question 18 of 20

1

Orbitals have a variety of shapes

Select one of the following:

  • True
  • False

Explanation

Question 19 of 20

1

Atoms of an element that have differing numbers of neutrons (but a constant atomic number) are termed ions

Select one of the following:

  • True
  • False

Explanation

Question 20 of 20

1

Elements are substances consisting of one type of molecule

Select one of the following:

  • True
  • False

Explanation

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