By the law of conservation of mass, when Na, H, and O form a compound, the mass will be

equal to the sum of the masses of the reactants

According to the law of definite proportions, any two samples of KCl will have

the same elements in the same proportions by mass

Rutherford's gold foil experiment led him to conclude that

a dense region of + charge existed somewhere in the atom

Which of the following pieces of Dalton's atomic theory had to be revised?

atoms of the same element are the same

The discovery of the nucleus was a result of Rutherford seeing a small % of + particles

being deflected back towards the source

Objects with like charge repel each other. Why do protons stay close to each other in nucleus?

A short-range force (nuclear force) binds protons together.

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Structure and Theory of Atoms

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A #chemistry quiz about #atomicstructure and #atomictheory #atoms

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Questions 15

Answers

1
Which of the following is not one of the laws that led to atomic theory?
law of conservation of mass
law of multiple proportions
law of definite proportions
law of half proportions
2
Since cathode rays deflected away from a negative charge, JJ Thomson surmised these rays were
neutral
positively charged
negatively charged
3
The majority of the mass of an atom is the
electron cloud
valence shells
quarks
nucleus
4
By the law of conservation of mass, when Na, H, and O form a compound, the mass will be
greater than the sum of the masses of the reactants
equal to the sum of the masses of the reactants
either less than or equal to the sum of the reactants
less than the sum of the masses of the reactants
5
According to the law of definite proportions, any two samples of KCl will have
the same elements in the same proportions by mass
slightly different structures
different densities
the same mass
6
Rutherford's gold foil experiment led him to conclude that
a dense region of + charge existed somewhere in the atom
Thomson's plum pudding model of the atom was accurate
light was emitted by e- returning to ground state
alpha particles were a poor choice for bombardment material
7
3 g of A + 8 g of B = AB. How many grams of B are in compound AB₂?
8
4
6
16
8
Which of the following pieces of Dalton's atomic theory had to be revised?
atoms of the same element are the same
atoms of different elements are different
atoms of different elements combine in simple ratios
atoms rearrange in chemical reactions
9
If the atom is the size of a football field, the nucleus is the size of a
marble
elephant
motorcycle
grain of sand
10
The discovery of the nucleus was a result of Rutherford seeing a small % of + particles
passing straight through the metal.
combining with the metal
being deflected back towards the source
being slightly deflected as they passed thru the metal
11
Neutral atoms contain equal number of
protons and neutrons
protons and electrons
electrons and neutrons
quarks and leptons
12
Objects with like charge repel each other. Why do protons stay close to each other in nucleus?
A short-range force (nuclear force) binds protons together.
There is no electric charge in the nucleus of an atom.
Neutrons cancel out the electric force.
Protons are balanced electrically by electrons.
13
Democritus's idea of the atom being indivisible is a
theory
opinion
14
The majority of the volume of an atom is the
electron cloud
quarks
nucleus
isotope
15
Glucose (C₆H₁₂O₆) is always 40% C, 7% H, and 53% O by mass. This is an example of the law of
conservation of mass
definite proportions
multiple proportions
gravity

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