Font size
WorksheetsElements and Compounds
Total questions: 63
Worksheet time: 5hrs 15mins
What is the chemical symbol for the element Oxygen?
O
Ox
Oy
Om
Which of the following is a compound?
H
O
H 2 O
N
Compare the number of atoms in a molecule of CO 2 to a molecule of H 2 O.
CO 2 has more atoms than H 2 O.
CO 2 has fewer atoms than H 2 O.
Both have the same number of atoms.
CO 2 has twice as many atoms as H 2 O.
Which of the following best describes a molecule?
A single atom of an element.
A group of atoms bonded together.
A mixture of different elements.
A type of chemical reaction.
Identify the compound from the following chemical formulas: NaCl, O 2 , N 2 , He.
NaCl
O 2
N 2
He
Explain why H 2 O is considered a compound and not an element.
It is made of two different elements chemically bonded.
It is a single type of atom.
It cannot be broken down into simpler substances.
It is a mixture of gases.
Which of the following statements is true about elements and compounds?
Elements can be broken down into simpler substances.
Compounds are made of two or more elements chemically combined.
Compounds consist of only one type of atom.
Elements are made of two or more compounds.
Which of the following statements is true about elements and compounds?
Elements can be broken down into simpler substances.
Compounds are made of two or more elements chemically combined.
Compounds consist of only one type of atom.
Elements are made of two or more compounds.
Given the chemical formula C 6 H 12 O 6 , determine the number of each type of atom present.
6 Carbon, 12 Hydrogen, 6 Oxygen
12 Carbon, 6 Hydrogen, 6 Oxygen
6 Carbon, 6 Hydrogen, 12 Oxygen
12 Carbon, 12 Hydrogen, 12 Oxygen
Analyze the chemical formula H 2 SO 4 and determine the number of atoms of each element present.
2 Hydrogen, 1 Sulfur, 4 Oxygen
1 Hydrogen, 2 Sulfur, 4 Oxygen
4 Hydrogen, 2 Sulfur, 1 Oxygen
2 Hydrogen, 4 Sulfur, 1 Oxygen
Na2CO3
Element
Compound
Mixture
Element
Compound
Mixture
Element
Compound
Mixture
Element
Compound
Mixture
Element
Compound
mixture
Element
Compound
Mixture
The smallest unit of matter that retains the chemical identity of the the elements
Element
Atom
Compound
Molecule
A pure substance made of one kind of atom that cannot be broken down chemically into simpler substances.
Element
Atom
Compound
Molecule
The simplest unit (particle) of a compound that can exist; formed when two or more atoms combine chemically.
Element
Atom
Compound
Molecule
Compare and contrast the following tiles, and determine whether each is a chemical symbol or a chemical formula. Use the table to sort the tiles into their respective categories.
Cl
H
O
C
Na
NaCl
NaH
HCl
CO
Compare the compounds to determine the elemental composition in each by placing each correct answer next to the corresponding chemical formula.
H2O = (a) (b)
CO2 = (c) (d)
Determine the elemental composition of the compound below.
C12H22O11 = (a) (b) (c)
Compare and contrast the chemical symbols and formulas in the table. Complete each row of the table by determining whether it is a chemical symbol or a chemical formula?
Ti
Li
CO
LiI
NaF
HCl
The following two representations of oxygen that are similar and different. Which two statements is true about what the letter means and what the subscript means?
O and O2
The letter O represents the element oxygen.
The letter O represents its placement on the periodic table.
The number in O2 represents the number of oxygen atoms that are bound to form a molecule.
The number in O2 represents the number of oxygen atoms that are bound to form a element.
Below are two different chemical formulas.
Formula 1: H2O
Formula 2: H2O2
Which statements about the chemical symbols of the elements within each formula are correct? Select two.
Both formulas contain two atom of the element hydrogen.
Both formulas contain one atom of the element iron.
Formula 2 contains two atoms of the element oxygen.
Formula 1 has two atoms of the element of oxygen.
The second formula contains three atoms of the element oxygen.
Which of the following is not a compound?
HCl
NaCl
Cl
CO2
Salt has a chemical formula of NaCl. Salt is a...
Compound
Mixture
Element
None of the Above
What is H2SO4
made up of?
2 hydrogen, 1 sulfur, 4 oxygen
2 hydrogen & 4 sodium
1 hydrogen, 2 sulfur, 4 oxygen
1 hydrogen & 6 sodium
In this diagram, X represents...
A compound
An atom
A mixture
An element
In this diagram, Y represents...
An element
A compound
A molecule
A mixture
Which example is a compound?
N2
Cu
O2
H2O2
Are there any compounds on the periodic table?
Yes,there are many.
No,because only elements are on the periodic table.
The number before the compound formula: it represents the number of molecules that are present
element
subscript
coefficient
compound
The number to the lower right of an element symbol in a compound formula that represents the number of atoms for that element.
subscript
coefficient
element
molecule
The one or two letter representation of an element. Symbols are often derived from the Latin name of the element
atomic number
element symbol
element name
atomic mass
Two atoms of the same element bonded together
monatomic
element number
diatomic
compound
A section of the Periodic Table is shown. What is the Chemical Symbol for Magnesium?
12
Magnesium
24.31
Mg
How many different elements are present in this molecule?
3 NH4C2H3O2
15
36
5
4
Look at the image. What is the atomic number for carbon?
12.011
6
7
8
Look at the image. What is the atomic number for oxygen?
15.999
16
8
9
The fluorine atom has an atomic number of
19
9
What is the mass number and atomic number ?
Mass number = 7, atomic number = 14
Mass number = 14, atomic number = 7
Atomic Number
Element Symbol
Element Name
Atomic Number
Element Symbol
Element Name
What is the mass number for this Magnesium atom?
12
24
23
8
The atomic number determines what an element is. A different atomic number makes a different element. What is the atomic number of Neon (Ne)?
10
20.18
9
58
none of these is correct
