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Elements & Compounds Review Flashcards | StudBud
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Elements & Compounds Review
Elements & Compounds Review
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1
NaHCO
3
is the chemical formula for baking soda. Why is baking soda considered a compound?
It reacts with combined with vinegar.
It contains more than one atom.
It is not a compound.
It contains more than one element that have chemically combined.
2
Which of the following is
true
?
Elements and compounds can be in mixtures.
Elements are made up of compounds.
Compounds are mixtures.
Mixtures are pure substances.
3
Oceans, lakes, and rivers are all included in the --
lithosphere.
hydrosphere.
atmosphere.
biosphere.
4
Which of the following contains a list of only elements and a reason why they are elements?
H2O, NaCl, N2. CO2 - these contain more than one chemical symbol
CO2, H2, Na, He - these are pure substances
F2, O3, Li, H - these substances are made of one type of atom
None of these contain only elements.
5
Mountains, soil, and the continents are all included in the --
hydrosphere.
lithosphere.
biosphere.
atmosphere.
6
Which of the following is the best description of an element?
a naturally occurring mineral made of more than one substance
a pure substance that cannot be broken down into a simpler substance
a small particle made with a specific chemical composition
a collection of atoms that have different abilities when joined together
7
One way to tell how many elements a compound has is to --
count all of the letters.
count the capital letters.
find the square root of the letters.
count all of the numbers and add them up.
8
Nitrogen, oxygen, and air are all included in the --
hydrosphere.
biosphere.
lithosphere.
atmosphere.
9
Which of the following contains an element followed by a compound that contains the element?
NH3 --- He
H --- H2O
CO2 --- C
NaCl --- Co
10
NaCl is the chemical ____________ for salt.
formula
symbol
name
number
11
Jane saw a letter P on a container in the science lab. Which element was
most likely
found in the container?
sodium
peroxide
phosphorus
flourine
12
Which of the following elements is one of the major components of living organisms?
Copper
Aluminium
Silicon
Carbon
13
This picture represents part of the periodic table. "H" is known as the element's chemical --
number
symbol
formula
name
14
While elements and compounds are related, they are different.
Unlike elements, compounds --
are made of at least two types of matter.
exist only as pure substances.
consist of only one type of atom.
are the smallest form of a particle.
15
Which of the following is a compound?
Aluminum- Al
Chex-Mix
Sodium Chloride- NaCl
Hydrogen- H
16
Which element makes up most of the Earth's atmosphere?
Hydrogen
Nitrogen
Carbon
Oxygen
17
Which two elements are abundant in all four parts of Earth?
Oxygen and Carbon
Nitrogen and Hydrogen
Hydrogen and Oxygen
Carbon and Nitrogen
18
Plants, animals, and humans are all included in the --
lithosphere.
hydrosphere.
atmosphere.
biosphere.
19
The table has two columns of different kinds of matter. Which of the following is the best label for the second column?
Mixtures
Pure Substances
Compounds
Atoms
20
Which of the following best explains the difference between elements and compounds?
They are the same thing.
Elements are chemically combined.
Elements are composed of 1 type of atom and compounds contain 2 or more.
Compounds are pure substances made of one type of particle.
21
Which elements are present in the compound NaHCO
3
?
All of these are in the compound.
Hydrogen
Sodium
Oxygen
22
Using the chart, which two gases make up the majority of Earth's atmosphere?
Carbon Dioxide
O2 and N2
CO2 and N2
CH4 and O2
23
Which answer choice correctly lists only elements?
Cl, H, K, CO2
N2, O2, Na, Zn
Cl, Na, CH3, Ne
H2O, Li, N, I2
24
According to the table, which element is most essential to our planet?
Oxygen
Nitrogen
Silicon
Hydrogen
25
Why is the periodic table called the "Periodic Table of Elements"?
It was created before any compounds were discovered.
It could be called the Periodic Table of Compounds since they are the same.
It lists all known elements in the universe.
