Atoms and Molecules

The study of what happens when an atom is broken apart is the subject of nuclear physics.
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Questions #: 25
Time: 5 minutes
Pass Score: 80.0%
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Is the atom the smallest piece of an element or of a compount?

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When you divide an atom, do you still have the same substance?

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Elements always combine in certain fixed proportions when they form a compound

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Law of Definite Propertions

When two elements combine, there is some smallest chunk of one element that unites with one, or two, or three, or more smallest chunks of the other element.

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When water is formed from hydrogen and oxygen, _____ atoms of hydrogen combine with each atom of oxygen

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In four molecules of water, how many hydrogen atoms are there?

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Describe the atomic composition of carbon dioxide

CO2

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HCI is hydrochloric acid. How many hydrogen atoms would twenty molecules of this acid contain?

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How many times more oxygen atoms than hydrogen atoms does the following compound contain?

H2SO4

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If each oxygen atom has 16 times as much mass as each hydrogen atom

what is the ratio of the mass of oxygen in H2SO4 to the mass of hydrogen?

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Does an atom really look like the figure?

atom-bohar-model.png

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Will a microscope someday enable you to see an atom?

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Bohr Model

The Bohr model of the atom is a theoretical construct that helps us visualize the of atoms in already-tested situations and to predict their in situations in which they have not been observed.

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behavior
position
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The Bohr atom is made up of ________ particles

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Bohr atom

The Bohr atom is made up of three particles:  the proton, the electron, and the neutron.  The (1) transparent has a positive electrical chare and exists in the nucleus with electrically neutral (2) transparent .  The negatively charged (3) transparent revolve around the nucleus, in all directions and in all planes, as in the below figure.

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electrons
proton
neutrons
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What is the resultant electrical charge on an atom with two protons and two electrons?

If each electron contains the same amount of negative electrical charge as a proton does positive charge, what is the resultant electrical charge on an atom with two protons and two electrons?

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If an atom is normally electrically neutral, what can you say about the number of electrons and protons?

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Refer to the nearby figure. How many protons would this atom have?

balance_electrons.gif

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Which particles in the atom interact with those of another atom?

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To determine whether a particular atom is of a difference element than another what do you need to know about the atoms?

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The number of protons in the nucleus of an atom of an element is called the _____ ______

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What is the atomic number of uranium?

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What element has only one proton in its nucleus?

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What does the atomic number tell us?

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How many electrons does lithium have when it is neutral?

write digits

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0
sin cos tan
sin-1 cos-1 tan-1 π e
xy x3 x2 ex 10x
y√x 3√x √x ln log
( ) 1/x % n!
7 8 9 + MS
4 5 6 – M+
1 2 3 × M-
0 . EXP ÷ MR
± RND C = MC

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