NEW
Font size
WorksheetsChemistry Atoms/Equations
Total questions: 30
Worksheet time: 23mins
Which particles have almost the same mass?
proton and electron
proton and neutron
electron and neutron
all three particles
Ethanol has six hydrogen atoms, two carbon atoms, and one oxygen atom. Which is the correct chemical formula?
C2H6O
2CH6O
6HCO
C26HO
Each substance written to the right of the arrow in a chemical equation is a ____.
reactant
product
precipitate
catalyst
A certain atom has 26 protons, 26 electrons, and 30 neutrons. It mass number is ____.
26
30
52
56
The three basic components of an atom are _____.
protons, neutrons, and ions
protons, neutrons, and electrons
protons, neutrinos, and ions
protium, deuterium, and tritium
Aspartame is an artificial sweetener; its formula is C13H16N2O5. Which element in the formula has the greatest number of atoms?
nitrogen
carbon
oxygen
hydrogen
Based on his experiment, Rutherford concluded that atoms were ____.
dense positively charged particles
uniform throughout
mainly empty space
made of protons, neutrons, and electrons
The nucleus of an atom consists of _____
electrons
neutrons
protons and neutrons
protons, neutrons, and electrons
Which item best represents Dalton’s mental image of an atom?
a cork
a candy bar with nuts
a marble
a balloon full of air
Most of the mass of an atom is found in its ____.
nucleus
electron cloud
atomic number
mass number
If two atoms have the same number of protons but different numbers of neutrons, they will have the same ____.
half-life
mass number
atomic number
degree of stability
A single proton has which electrical charge?
no charge
positive charge
negative charge
either a positive or a negative charge
Which of the following is NOT a developer of an atomic model?
Dalton
Planck
Rutherford
Thomson
In an atom, electrons ____.
are located in the nucleus
are paired with neutrons
travel outside the nucleus
are always in the same place in an atom
Aluminum oxide is a chemical formula with two aluminum atoms and three oxygen atoms. Which is the correct chemical formula?
Al2O3
(Al2)O3
2AlO3
Al3O2
16. Which of the following statements best describes how the Bohr model of an atom is different from this one?
Bohr’s model had more electrons around the nucleus.
Bohr’s model shows electrons at certain distances from the nucleus.
Bohr’s model placed the electrons in the nucleus.
Bohr’s model did not distinguish positive and negative charges.
Which scientist developed this model for atoms?
Dalton
Democritus
Rutherford
Thomson
Which item best represents Thomson’s mental image of an atom?
a sponge
a chocolate-chip cookie
a bowling ball
a beach ball
19. Marco put a pot of water on to boil eggs. After a few minutes, all the water was gone. This is an example of _____.
condensation
deposition
sublimation
vaporization
According to the law of conservation of mass, how does the mass of the products in a chemical reaction compare to the mass of the reactants?
There is no relationship.
The mass of products is sometimes greater.
The mass of reactants is greater.
The masses are always equal.
During a hot shower, water vapor fogs up the cooler mirror when it turns to water. This is an example of _____.
condensation
deposition
sublimation
vaporization
Which of the following is certain proof a chemical reaction has occurred?
bubbles
change of chemical properties
new substance formed
all of the options listed
When Rutherford performed his metal foil experiment, he was surprised that most of the alpha particles ____.
were deflected by the foil
bounced back from the foil
were absorbed by the foil
passed straight through the foil
This formula shows the chemical reaction that occurs when the body breaks down sugar. How many carbon atoms are needed for this reaction to take place?
1
2
6
12
Which of the following determined that cathode rays are negatively charged?
Aristotle
Dalton
Rutherford
Thomson
How many electrons are needed in the outer energy levels of most atoms for the atom to be chemically stable?
2
4
6
8
Snow forms in clouds because water vapor changes directly to ice. This is an example of _____.
condensation
deposition
sublimation
vaporization
Sodium (Na) contains 11 protons and 12 neutrons. How can you use this information to determine the mass number of sodium?
The mass is the number of protons
The mass is the number of protons plus the number of neutrons.
The mass is the number of protons minus the number of neutrons.
The mass is the number of neutrons.
What are the products?
2h2 + O2
2H2O
What are the reactants?
2h2 + O2
2H2O
