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WorksheetsCFA 1 Science Corrections Quizizz
Total questions: 20
Worksheet time: 10mins
Both models are accurate because they show protons and electrons inside the nucleus.
Model 1 is accurate because the numbers of protons and electrons inside the atom are the same.
Both models are accurate because they contain positively charged protons and negatively charged electrons.
Model 2 is accurate because it shows protons and neutrons at the center of the atom and electrons in orbits around the center.
Atoms are filled with particles and have a large, dense positive center.
Atoms are filled with particles and have a large, dense negative center.
Atoms are mostly empty space with a small, dense positive center.
Atoms re mostly empty space with a small, dense negative center.
In order to determine if two atoms are copper (Cu) atoms, what must be the same for each?
the number of valence electrons
the number of protons
the charge of the atom
the size of the atom
A compound is made up of two or more different elements. Which gas is classified as a compound?
Carbon Dioxide
Hydrogen
Nitrogen
Oxygen
Arrangements 1 and 2 are elements; elements are made of atoms or molecules composed of the same kind of atoms.
Arrangements 1 and 2 are compounds; compounds are composed of different types of atoms.
Arrangement 1 is an element, and arrangement 2 is a compound; an element is made of one atom, and a compound is made of one molecule
Arrangement 1 is an element, and arrangement 2 is a mixture; an element is made of one atom, and a mixture is made of more than one atom.
1
2
3
4
isotope
ion
atom
molecule
When two Nitrogen atoms combine, they form a
mixture
compound
molecule
liquid
Substance A is an element as atoms are not combined chemically.
Substance A is a compound as two different types of atoms are present.
Substance B is a mixture as the atoms can be separated by any physical process.
Substance B is a compound as the atoms can be separated only by chemical processes.
Figure 1: element; Figure 2: compound; Figure 3: mixture
Figure 1: element; Figure 2: mixture; Figure 3: compound
Figure 1: compound; Figure 2: element; Figure 3: mixture
Figure 1: compound; Figure 2: mixture; Figure 3: element
A
B
C
D
Pennies are made of zinc with a layer of copper on top. If a penny is heated, the copper and zinc can combine to form brass. Which term best describes brass?
an atom
a mixture
a molecule
an element
statement 1 only
statement 2 only
statements 1, 2 and 3
statements 1, 3 and 4
They are good conductors of heat.
They are chemically inert in nature. (not reactive)
They have more reactive nuclei than metals.
They have different numbers of valence electrons.
A
B
C
D
Both elements A and B are on the left of the periodic table.
Both elements A and B are on the right of the periodic table.
The element A is on the left of the periodic table, and element B is on the right of the periodic table.
The element A is on the right of the periodic table, and element B is on the left of the periodic table.
If an atom has two protons and three electrons, then the atom is
positively charged.
negatively charged.
radioactive.
neutral.
Which statement best describes an atom with an atomic number of 20?
The atom has 20 protons.
The atom has 20 neutrons.
The sum of the number of protons and electrons is 20.
The sum of the number of protons and neutrons is 20.
