WorksheetsElements and Compounds Retest
Total questions: 20
Worksheet time: 14mins
Which of the following statements is NOT true regarding elements and compounds?
Compounds are made of two or more elements.
Compounds are represented by formulas.
Elements are represented with multiple chemical symbols.
An element is a pure substance made of only one kind of atom.
Which of the following is used to represent an element on the periodic table?
The element's density
The element's smell
The element's color
The element's chemical symbol
Match each statement with whether it describes an element or a compound.
Compounds are made up of one type of atom, while elements are not.
Describes a compound incorrectly.
Compounds can be identified by chemical symbols, while elements can be identified by chemical formulas.
Describes how compounds and elements are identified incorrectly.
An element indicates the type of molecule found in a substance, while a compound refers to the type of atom found in a substance.
Describes the difference between element and compound incorrectly.
Elements are listed on the periodic table, while compounds are not.
Describes a correct difference between elements and compounds.
A student classified four different substances in a data table.
Which substance is identified correctly?
Substance B
Substance C
Substance D
Substance A
Several substances are classified in each column of the data table.
Which of the following would be the BEST titles for each column on the table?
1 - Compounds
2 - Molecules
1 - Atoms
2 - Molecules
1 - Compounds
2 - Elements
1 - Symbols
2 - Formulas
Why should Chloroform be classified as a compound?
It contains at least two elements of different atoms.
It contains at least two atoms of the same element.
It contains at least two elements of different compounds.
It contains at least two atoms of different elements.
Which term BEST describes each statement? Move ONE correct answer to each box.
Represented by a chemical formula and is always a molecule. (a)
Represented by a chemical symbol and is always one kind of atom. (b)
Which of the following is a compound?
O2
NaCl2
K
Fe2
The picture shows a group of students debated the difference between chemical symbols and formulas. Which student correctly summarizes the difference between chemical symbols and formulas?
Student A
Student B
Student C
Student D
The chemical formula Na2CO3 contains one atom of...
(a)
The chemical formula for acetone is shown.
Which table correctly lists the type of atoms and the number of each type of atom in one molecule of acetone?
Using the periodic table, identify which elements are present in the chemical formula Na2CO3.
Sodium and cobalt
Sodium, cobalt and oxygen
Sodium, carbon, and oxygen
Salt, carbon, and oxygen
How many atoms of carbon are in one molecule of glucose, C6H12O6?
1
24
6
12
Which elements are contained in the following chemical formula?
CoCl2
Select TWO correct answers.
Cobalt
Carbon
Chlorine
Oxygen
Iodine
How many atoms of oxygen are present in this chemical formula?
Cu(NO3)2
Three
Six
Two
Five
How many total atoms are in a molecule of C4H10O?
Enter your answer, as a number, in the box.
Which of the following statements is TRUE when comparing a molecule of saccharin, C7H5NO3S, and a molecule of erythritol, C4H10O4 both common artificial sweeteners?
A molecule of saccharin has one more element than a molecule of erythritol.
Molecules of erythritol and saccharin have the same number of atoms.
A molecule of saccharin has one more atom than a molecule of erythritol.
A molecule of erythritol has one more atom than a molecule of saccharin.
Which of the following formulas has the most nitrogen atoms?
Fe(NO3)3
NH4NO3
(NH4)2SO4
KNO3
Which formulas listed contain equal numbers of nitrogen atoms? Select TWO correct answers.
(NH4)2SO4
NaNO3
Co(NO3)2
Fe(NO3)3
Pb(N3)2
Which statement best describes the difference between an element and a compound?
An element contains molecules, while a compound contains only atoms.
An element is made of only one type of atom, while a compound contains two or more types of atoms chemically combined.
An element can be separated into simpler substances, but a compound cannot.
An element is always a gas, while a compound is always a solid.
