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WorksheetsUnit 2 Science 6th
Total questions: 73
Worksheet time: 48mins
Earth's atmosphere is made up mostly of which elements? (6.5B)
Carbon dioxide and oxygen
nitrogen and helium
helium and carbon dioxide
nitrogen and oxygen
Look at the circle graph of the different elements in Earth's crust.
Based on the graph, which conclusion can be drawn about the elements in Earth's Crust? (6.5B)
Iron is more abundant than sodium.
Silicon is more abundant than oxygen.
Aluminum is more abundant than silicon.
Calcium is more abundant than magnesium.
Which word describes two or more elements that are mixed together in a fixed proportion? (6.5C)
mixture
Compound
Element
Atom
A scientist isolates an element during an experiment. How can he know that it is an element? (6.5C)
It is made up of only one type of atom.
It is made up of exactly two types or atoms.
It is in the periodic table.
It has characteristics.
A student is given a sample of an unknown substance. He is asked to determine if it is classified as a metal, a metalloid, or a nonmetal. He discovered that the unknown element conducted some heat and electricity, had a shine luster, and broke easily. this element is most likely a (6.6A) -
metal
nonmetal
metalloid
cannot be determined
Which of the following correctly list the three main groups of elements from greatest conductivity to least conductivity? (6.6A)
Nonmetals-metalloids- metals
metals-nonmetals-metalloids
metalloids-metal-nonmetals
Metals-metalloids-nonmetals
John was observing the physical properties of elements in order to classify them as either a metal, nonmetal, or metalloid. The first element was dull, brittle, and do not conduct heat, what is the element most likely classified as (6.6A)
metal
metalloid
nonmetal
Every minute we are creating a new substance when we inhale oxygen since inside the body there is a chemical reaction. What is the new substance created when we exhale breath? (6.5C)
Calcium carbonate
carbon
carbon dioxide
dioxide
Which element makes up most of the element of the Earth's crust? Write the element names and its chemical symbol. (6.5A)
How many elements are involved in the reaction shown below? (6.5A)
C3H8+5O2---------- 3CO2 + 4H20
7 elements
3 elements
17 elements
19 elements
Lorena is in the lab trying to demonstrate that she is capable to create a new substance during his experiments. What are the sign of the formation of a new substance? (6.5C)
A chemical reaction where color and temperature change.
A chemical reaction where formation of gas, change of color, and precipitate happens.
A chemical reaction where a formation of gas, change of color, change of temperature, it precipitates, change of odor might happen.
A chemical reaction where a formation of a new substance happens.
What is the best prove of a formation of a new substance? (6.5C)
create gas (bubbling)
precipite (creation of a solid)
change of temperature
change of color
The chemical symbol of an element always matches the element's name.
Agree
Disagree
Which of the following is a compound?
Si
CO2
Cl
He
Ti
Which of the following represents an element?
H2O
HCl
NaCl
Au
CaCO3
Which letter represents an element?
E
B
I
H
Which of the following could be a symbol on the periodic table of elements?
CC
Cc
cc
CcC
CK1
What is NOT made up of two or more elements that are chemically combined?
Element
Compound
Mixture
Solid
Liquid
How many elements are there in CuSO4?
1
2
3
4
5
Which of the following is an element?
Gold
Air
Water
Carbon Dioxide
Nitrous Oxide
Fe is the ___________________ for iron
Letters
Chemical Symbol
Equation
A(n) ______________ is formed when two or more elements chemically combine.
Compound
Element
Mixture
True or false: Compounds have 2 or more elements chemically combined.
True
False
The smallest particle of any particular type of matter is known by which of the following terms?
Element
Chemical
Atom
Compound
True or false: A mixtures parts can be separated.
true
false
Which letter represents a compound?
D
H
E
C
Carbon is considered an element, while carbon dioxide is considered a compound. This is because carbon dioxide is ---
a gas at room temperature.
made of two different elements.
given off by green plants.
useful to human beings
A section of the Periodic Table is shown. What is the Chemical Symbol for Magnesium?
12
Magnesium
24.31
Mg
Compounds are different than elements because compounds are ---
combinations of two or more elements.
not able to be broken down into parts.
made from the same type of atoms.
a pure substance; elements are not.
Na2CO3
cL
Na
NaCl
Ca
Cl
CO2
h
hE
What is true about ALL chemical changes?
They all produces gas/bubbles/fizzing
They all have a temperature change (hotter/colder)
They all change colors
They all produce NEW and DIFFERENT substances
A teacher shows the class two liquids that are both odorless and clear. When they mix together, solid gold chunks are formed. What change occurred and how do you know?
A chemical change because a precipitate was formed
A physical change because there was a color change
A chemical change because an odor was produced
A physical change because the volume increased when the two liquids were mixed together.
In class, a teacher places a balloon filled with baking soda over a flask filled with vinegar. When the powder falls into the flask and combines with the vinegar, the balloon inflates (fills up with air). What evidence is there that a chemical change occurs?
The powder and liquid combine
A gas is produced that fills up the balloon.
There is no evidence that a chemical reaction to place
The powder stayed solid so it is considered a precipitate
When I go to Chipotle I love to order guacamole. It smells amazing and tastes even better! Unfortunately, sometimes I don't eat it fast enough and it turns brown. Stirring it up hides the brown, but if it sits out longer, it continues to change. What indicates a chemical reaction in this scenario?
The guacamole smells amazing
The guacamole tastes incredible
The guacamole turns a yucky brown color
I stir the guacamole to get rid of the brown
Check all of the words that may indicate a Physical Change:
Melting
Freezing
Burning
Mixing
Precipitate formed
Choose all of the words that may indicate a chemical change has occurred.
Burning
Evaporating
Dissolving
Odor change
Energy change (sound,light, temp)
Solid changes to a liquid
Melting
Freezing
Evaporation
Condensation
What is the main difference between a physical and chemical change?
A physical change does not change the identity of the substance and a chemical change does
A chemical change does not change the identity of the substance and a physical change does
They are the same.
Physical or chemical change?
Bubbles form
Physical Change
Chemical Change
Physical or chemical change?
Change in color
Physical Change
Chemical Change
Physical or chemical change?
Precipitate Forms
Physical Change
Chemical Change
Physical or chemical change?
Dissolving
Physical Change
Chemical Change
Physical or chemical change?
Breaking
Physical Change
Chemical Change
Physical or chemical change?
Shattering
Physical Change
Chemical Change
Physical or chemical change?
Changing State of Matter
Physical Change
Chemical Change
Physical or chemical change?
A new substance is formed.
Physical Change
Chemical Change
Physical or chemical change?
A change occurs but the substance keeps it's identity.
Physical Change
Chemical Change
