Module 1 - CHM
For the ionic compound NaCI, what is the charge on the sodium ion?
+1
Which of the following options correctly describe the chemical symbols for elements?
- Chemical symbols are abbreviations for elements named for properties, planets, places, and people - Chemical symbols are also called atomic symbols
Which of the following options describe atoms?
- Compounds contain two or more different types of atoms - An atom is the smallest unit of an element that can exist a a stable, independent entity - Atoms are extremely small
What are the environmental challenges to extracting metals from recycled electronic devices?
- Contaminated groundwater could contribute to an increase of cancers in surrounding communities - groundwater could be contaminated with heavy metal - the solvents used to remove the plastics are not generally enviromentally friendly
Which of the following options correctly described elements and compounds?
- Elements and compounds are both pure substances - There are many more known compounds than elements - A compound contains two or more different elements
Which of the following chemical symbols are correct?
- The chemical symbol for argon is Ar - The chemical symbol for carbon is C
Which of the following options describe the correct format used when writing the chemical formula of a substance?
- a chemical formula is a symbolic way to represent the composition of a substance - The number of atoms of a particular element is indicated by a subscript
which of the following options correctly describe silica?
- quartz is a form of silica - silica is a naturally occurring substance - silica has a well-ordered structure composed of repeating linkages between Si and O
which of the following statements correctly describe subatomic particles?
- the mass of an electron is much smaller than the mass of a proton - the electrons are located outside the nucleus of an atom - Protons are positively charged
Which of the following form the focus of the "cradle-to-grave" approach to consumer goods?
- the raw materials from which the goods are made - the energy consumed to produce the goods - the waste products created when the goods were made
express in scientific notation. 1350.m
1.350 X 10^3m
the majority of new smartphones being released have displays that are at least 5 inches in size, what is the size in cm?
12.7 cm
How many protons and neutrons, respectively, are in an atom of chlorine (mass number 35)?
17;18
2.3 x 10^6 meters is the same as _____________ meters
2,300,000
how many proton and electrons does Be have
4,4
how many protons are in an atom of carbon
6
The quantity 0.0000064 g expressed in scientific notation.
6.4 x 10^-6g
What is the correct answer to the following problem? (3.2/0.123) + 45.7=?
72
Which of the following is a diatomic molecule: Hydrogen (H2) Aluminum (AI) Sulfur (S8) Carbon (C)
Hydrogen
Which of the following options shows the correct formula for writing an element symbol of two letters? mg Mg mG MG
Mg
N=________
Nitrogen
Which of the following are allotropes of oxygen?
O2, O3
S=______
Sulfur
Which of the following statements correctly defines a molecule?
a molecule is independent structure consisting of two or more atoms chemically bonded together
What is a nonmetal?
an element that is a poor conductor of heat and electricity
The smallest unit of an element that can exist as a stable independent entity is an________
atom
A molecule is an independent structure of two or more ______ chemically bonded together
atoms
a substance that can be broken down into two or more simpler substances by chemical methods is called
compound
compound=
consists of two or more elements, chemically bound
element =
contains only one type of atom
An approach to analyzing the life cycle of an item, beginning with the raw materials from which it is made to its ultimate disposal, is called the ________ approach
cradle-to-grave
A chemical ______ (e.g. CO2) represents the elementary composition of any pure substance.
formula
what is metal
good conductor of heat and electricity
what is a metalloid
has properties between those of metals and nonmetals
In a glass of flat coca cola, the cola is considered a _______ mixture because its composition is _________
homogeneous; uniform
Chemistry is the study of matter, which is commonly defined as anything that has ____ and occupies ______
mass; space
which type of metal is this: Ca =
metal
which type of metal is this: Si=
metalloid
Air =_________
mixture
electron =
negatively charged particle
which type of metal is this: S =
nonmetal
the atomic number is the
number of protons in the nucleus
ppt=
parts per 10^12 parts
ppm =
parts per 10^6 parts
ppb=
parts per 10^9 parts
proton=
positively charged particle found within the center of the atom
which of the following is a subatomic particle located in the center of the atom and has a positive charge?
protons
O2 =________
pure substance
Silica is naturally occurring oxide of silicon, SiO2, which is transparent, Pure crystalized SiO2 is known as__________
quartz
Si=________
silicon
Ag=_______
silver
nucleus =
small region that contains almost all the mass of an atom
Na =_________
sodium
which is not a mixture? sodium chloride seawater a jar filled with rocks and sand a glass of kool aid
sodium chloride
When an electron device is recycled, the metals are recovered by __________
treatment with strong acid
neutron=
uncharged dense particle located in the center of the atom
