Elena Flores
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Physics and Chemistry: Unit 3 - The atoms and chemical substances.

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Elena Flores
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Unit 3 - The atom and chemical substances

Question 1 of 10

1

What charge do protons have?

Select one of the following:

  • Positive

  • Negative

Explanation

Question 2 of 10

1

Is H2 a simple substance or an element?

Select one of the following:

  • Simple substance

  • Element

Explanation

Question 3 of 10

1

Every chemical elements is made up by the same atoms.

Select one of the following:

  • True
  • False

Explanation

Question 4 of 10

1

Democritus knew that atoms were divisible and were formed by subatomic particles.

Select one of the following:

  • True
  • False

Explanation

Question 5 of 10

1

How is the net charge of the atoms?

Select one of the following:

  • Positive

  • Neutral

  • Negative

Explanation

Question 6 of 10

1

Fill the blank spaces to complete the text.

Symbols of the chemical elements:
Hydrogen is is C Copper is is Ni
is Ca Sodium is is Al Gold is
Iron is is S Magnesium is is Ag

Explanation

Question 7 of 10

1

Anion is an ion with more electrons than protons

Select one of the following:

  • True
  • False

Explanation

Question 8 of 10

1

Select from the dropdown lists to complete the text.

- Atomic nucleus: its formed by ( protons, electrons ) and neutrons, and it's in the ( middle of the atom, outside of the atom ), occupying a very ( small, big ) space relative to the rest of the atom.
- ( Rest of the atom, Out part, Helmet ): also called the shell. ( Electrons, Protons, Neutrons ) occupy the empty space around each atomic nucleus. Scientists thought electrons ( orbited, surrounded, jumped ) the nucleus.

Explanation

Question 9 of 10

1

The atomic mass number is the sum of the number of neutrons and electrons

Select one of the following:

  • True
  • False

Explanation

Question 10 of 10

1

Se+ is...

Select one of the following:

  • A Selenium Atom (neutral)

  • A Selenium Atom (negative)

  • A Selenium Ion (cation)

  • A Selenium Ion (anion)

  • A Selenium Ion (neutral)

Explanation

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