Deleon Chemistry- Chapter 3 test answers
Consider the chemical formula for one molecule of table sugar, C12H22O11. if instead of one molecule of sugar we had 5, how many oxygen atoms would be present
55
how many atoms of oxygen are indicated in the formula Fe(NO3)2
6
How many hydrogen atoms are in the molecule C3H5(OH)3
8
one unit of aluminum sulfide contains 2 atoms of aluminum for every 3 atoms of sulfur. what is the chemical formula for aluminum sulfide
Al2S3
Which element is malleable, ductile, and a good conductor of electricity
Au
Which is a metalloid
B
Which is an anion
Cl-1
Which is the correct symbol for iron
Fe
Which is a cation
Fe+3
which of the following alternatives does not represent a molecule
Ga
which is not a diatomic gas
I2
What is the symbol of the element that is classified as an alkali metal and is in period 4
K
one unit of potassium oxide contains two atoms of potassium for every atom of oxygen. what is the chemical formula for potassium oxide
K2O
Which is best classified as a semiconductor
silicon
which is an alkali metal
sodium
which element is most similar to calcium
strontium
One of the properties of metal is their ductility. This means that
they can be drawn into wires
an ion is an electrically charged atom or group of atoms
true
elements are the basic building blocks of all substances
true
more substances exist as compounds than elements
true
Which of the following formulas contains the fewest oxygen atoms
Na2CO3
The symbol for one crystalline form of sulfur is S8. This symbol indicates
One molecule composed of Eight atoms
Which is a molecule of phosphorus
P4
Which element is brittle and a poor conductor of electricity
S
Which is a metalloid
Si
what is the symbol of the element that is classified as a metalloid and is in group IV A and period 3
Si
homogenous mixtures of metals are called
alloys
All gases exist as a diatomic molecules
false
The elements are distributed uniformly in nature
false
The names of all the elements are derived from ancient Greek and latin
false
Under normal conditions, all diatomic elements exist as gases
false
in nature most matter exist as pure substances
false
there are three types of chemical substances- elements, compounds, and mixtures
false
water is a chemical element
false
Which is the most abundant element in the universe
hydrogen
which is an alkaline earth metal
magnesium
consider the chemical formula for one molecule of methane, CH4. if instead of one molecule we had 10 molecules of methane, how many carbon atoms would be present
10
The formula CsH5(OH)3 contains
14 total atoms
What is the name of the element with an atomic number of 80
mercury
The ultimate particle of water is a()
molecule
The smallest uncharged individual unit of a compound is a(n)
molecules
what is the atomic number of potassium
19
which is a noble gas
neon
The sulfate group is SO4-2. How many sulfate groups are in the formula Fe2(SO4)3
3
how many different elements are presented in the compound FeSO4
3
based on the chemical formula Mg3(AsO4)2, choose the alternative that lists the number of atoms and the names of each of the elements presented in the compound
3 atoms of magnesium, 2 atoms of arsenic, 8 atoms of oxygen
what is the atomic number of selenium
34
consider the chemical formula for one unit of aluminum sulfate, Al2(SO4)3. how many total atoms would be present and 22 units of aluminum sulfate
374
How many hydrogen atoms are in the molecule CH3OH
4
How many atoms of calcium are indicated in the formula Ca(NO3)2
1
The nitrate group is NO3-1. How many nitrate groups are in the formula NaNO3
1
An ionic compound is held together by
attractive forces between ions of different charges
Which is not a characteristic of metals
brittle
Which is not a diatomic gas
bromine
which element is most similar to bromine
chlorine
which is a halogen
chlorine
what is the name of the element with an atomic number of 24
chromium
Which cannot be broken down chemically or physically into a simpler substance?
copper
which chemical symbol is properly written
cu
Which cannot be broken down by chemical or physical means
element
