WorksheetsChapter 7.1-Matter & Atoms
Total questions: 44
Worksheet time: 25mins
Which is the smallest piece of an element that still represents that element?
a quark
an electron
an atom
a molecule
What is matter?
anything that you can see, hear or feel
anything with mass that takes up space
anything that can be burned
anything that exists
Which describes the composition of a substance?
it is always the same
it is not always the same
it contains only one type of element
it contains more than one type of element
Which is true of the molecules in any compound?
they contain at least three atoms
they contain at least two atoms of the same element
they contain atoms of at least two different elements
they contain atoms of at least three different elements
Which is the best model for a heterogeneous mixture?
image A
image B
image C
image D
What is shown here?
two different ions
two different elements
two different isotopes
two different compounds
Two atoms of the same element can differ in which of the following?
the number of protons, neutrons, or electrons
only in the number of protons or electrons
only in the number of protons or neutrons
only in the number of neutrons or electrons
What is true of all neutral atoms?
they have equal numbers of neutrons and electrons
they have equal numbers of protons and neutrons
they have equal numbers of protons and electrons
they have equal numbers of protons, neutrons and electrons
A calcium ion has 20 neutrons, 20 protons, and 18 electrons. What is the ion's charge?
2+
1+
1-
2-
Why is the area around the nucleus called the electron cloud?
because it contains a dense cloud of many electrons
because the electrons are constantly moving
because scientists do not know how many electrons an atom has
because electrons are large and diffuse particles
Matter that has fixed composition is a __________.
solid
mixture
solution
substance
Which of the following is a solution?
chlorine
salt water
muddy water
milk
Which are combinations of substances that can be separated by physical processes?
mixtures
elements
compounds
atoms
A(n) __________ is made of two or more elements chemically combined in fixed ratios.
atom
solution
mixture
compound
What is an example of homogeneous mixtures?
salad
powdered drink mix
vegetable soup
pecan ice cream
A mixture in which the substances are not mixed evenly is called __________.
homogeneous
a solution
heterogeneous
precipitated
Which is the substance being dissolved in a solution?
the solute
the solvent
the insolvent
the substrate
Which is a substance that cannot be broken down into simpler substances?
a mixture
a metal
a compound
an element
A(n) ________ is a combination of chemical symbols indicating what elements are present in a molecule.
subscript
superscript
chemical formula
chemical equation
What particle in an atom is electrically neutral?
alpha
proton
neutron
electron
Atoms of the same element that have different numbers of neutrons are called __________.
isotopes
protons
metals
ions
An element's atomic number is the number of __________ in the nucleus of each atom of that element.
neutrons
protons
electrons
positrons
An atom containing six protons and six electrons has __________ charge.
a positive
a negative
no net
a strong negative
Most of an atom's mass is contained in __________.
the electron orbits
the electron cloud
its outer energy shell
its nucleus
A(n) __________ is an atom that has gained or lost an electron and is no longer neutral.
ion
isotope
molecule
compound
What is represented in each square of the periodic table?
one molecule
one element
one ion
one electron
Which of the following is a substance?
granite
brass
salt
smoke
How do substances and mixtures differ?
the composition of one is always the same, and the composition of the other varies
one contains only one type of atom, and the other contains two or more
one is always homogeneous, and the other is always heterogeneous
one contains one type of molecule, and the other contains two types
The item shown here can not be part of which of the following?
a mixture
a substance
an element
a compound
A mixture can also be called a solution in which case?
when it contains an insoluble substance
when it is heterogeneous
when it is homogeneous
when it contains two types of substances
Which statement is NOT true?
molecules contain atoms
atoms contain particles
substances contain atoms
atoms contain molecules
A beryllium atom contains 4 protons, 4 neutrons and 4 electrons. What is the atomic number of beryllium?
2
4
8
12
How do the masses of neutrons, protons and electrons compare?
neutrons and protons are much larger than electrons
neutrons and protons are much smaller than electrons
protons and electrons are much larger than neutrons
protons and electrons are much smaller than neutrons
Two atoms with different numbers of protons are what?
two different isotopes
two different ions
two different compounds
two different elements
What is being formed in this image?
a negative ion
a positive ion
an isotope
a new element
Based on the diagram and the periodic table, which three statements correctly describe a silicon atom?
Electrons are not present in the nucleus of a silicon atom.
There are 14 protons in the nucleus of a silicon atom.
Silicon atoms have no electrons.
A silicon atom should have 16 protons.
There are equal numbers of protons and neutrons in a silicon atom with a mass number of 28.
A student was reading about the gases in air. Ozone helps protect Earth from harmful ultraviolet rays that come from the sun. Certain types of pollution created by humans have caused a hole in the ozone layer. This hole is over the South Pole and could become larger if this type of pollution increases. Which question should the student ask to determine if ozone is an elemental molecule?
What is the color of the molecule?
What is the shape of the molecule?
What elements are present in the molecule?
How many atoms are present in the molecule?
The student describes particles on the edge of the atom. Which statement supports the student’s claim that the particles on the edge of the atom do not move away from the center?
The particles are connected to the center by an object similar to a rope.
The particles are attracted to the center because they have a charge opposite to the center’s charge.
The particles are held in place because atoms are a solid structure.
The particles are pushed toward the center by the nuclear charges of other atoms.
Students have been studying air quality. The teacher provides them with particle diagrams of the components of five air samples. Which three diagrams contain compound molecules?
Students make lists of characteristics that describe an isotope of carbon (C). Which list is correct?
Which statement best classifies air?
Air is a pure substance because it is composed of pure substances.
Air is a pure substance because its properties rarely change.
Air is a mixture because it has the same properties at all times.
Air is a mixture because its composition varies.
Which question about photochemical smog could not be experimentally determined by scientists?
In what year will the amount of sulfur in the air start to decrease?
How many different types of hydrocarbons are found in gasoline?
What concentration of gas molecules causes a visible brown haze in the air?
What temperature is the car engine when it begins to produce nitric oxide in the cylinder?
One of the components contained in gasoline is octane (C8H18). Which statement best describes C8H18?
It is a mixture containing a combination of the properties of hydrogen and carbon.
It is a pure substance containing a combination of the properties of hydrogen and carbon.
It is a mixture containing properties different from those of hydrogen and carbon.
It is a pure substance containing properties different from those of hydrogen and carbon.
Students compare the properties of the substances in Table 3 with the properties of the elements in Table 4.
. Pure substances in the air reacted to form mixtures of themselves
Nitrogen dioxide is a pure substance while both ozone and sulfur dioxide are mixtures
Nitrogen dioxide is a mixture while both ozone and sulfur dioxide are pure substances.
Pure substances in the air reacted to produce other pure substances.
