TEKS 6.6E Chemical Changes
TEKS 6.6B Pure Substances and Mixtures
TEKS 6.6E Chemical Changes
TEKS 6.6B Pure Substances and Mixtures
ALL From Unit One
100
Bubbles form during an experiment. Did a chemical change occur?
YES
100
A heterogeneous mixture can best be described as
A.Looks the same throughout
B.Made of only one element
C.You can see the different parts
D.A pure substance
C.You can see the different parts
100
Which sign indicates that a chemical change is happening?
A. Change in shape
B. Change in size
C. Change in state of matter
D. Production of a new substance, like gas or color change
D. Production of a new substance, like gas or color change
100
A heterogeneous mixture has different parts that can be easily separated.
A.True
B.False
A.True
100
Which of the following properties would you expect of a solid?
A.shape determined by its container
B.a fixed shape
C.low melting point
D.compressible
B.a fixed shape
200
Which of the following is NOT a sign of a chemical change?
A.Change in color
B.Formation of a gas
C.Change in state (solid → liquid)
D.Production of heat or light
C.Change in state (solid → liquid)
200
Which food dish would be considered a homogeneous mixture? TEKS 6.6B
Multiple choice question.
A)granola
B)fruit salad
C)tomato soup
D)spaghetti and meatballs
C)tomato soup
200
Which of the following is a chemical property of iron?
A.melting when heated
B.sticking to a magnet
C.rusting over time
D.conducting electricity
C.rusting over time
200
Which of the following is a pure substance?
A.Lemonade
B.Salt (NaCl)
C.Salad
D.Trail Mix
B.Salt (NaCl)
200
A student knows that the element copper is a metal. Using this information, where would the student locate copper on the above periodic table?
A.A
B.B
C.C
D.D
A.A
300
Three silver and gray metal objects interact with air and water. Which object shows evidence of a possible chemical change and the formation of a new substance? 
Object A
300
A student claims that vegetable pizza is a heterogeneous mixture. What evidence supports this claim?
In a heterogeneous mixture, the different components are not evenly distributed and can be easily seen and separated
300
A slice of bread turns black after being left in a toaster too long. What does this show?
A. A physical change has happened
B. A chemical change has happened
C. The bread only changed state
D. The bread dissolved
B. A chemical change has happened
300
Which of the following is a mixture?
A. Gold bar (Au)
B. Distilled water (H₂O)
C. Air
D. Carbon dioxide (CO₂)
C. Air
300
A student adds glycerin, water, and cooking oil to a glass and then puts a plastic ball in it. Which of these is less dense?
A.water
B.plastic ball
C.glycerin
D.cooking oil
D. Cooking Oil
400
Which piece of evidence best supports that milk spoiling is a chemical change? TEKS 6.6E
Multiple choice question.
A)The milk remains white.
B)Solids form in the milk.
C)A gas forms which gives the spoiled milk its bad smell.
D)The milk warms up when left out of the refrigerator.
A gas forms which gives the spoiled milk its bad smell.
400
An element is a pure substance in which there are how many kinds of atoms?
A.2
B.4
C.3
D.1
D.1
400
A chemical change that produces a solid from two liquids is called
A.a precipitate
B.a reactant
C.a molecule
D.a solution
A.a precipitate
400
A bowl of cereal with milk and strawberries is an example of a—
A. Compound
B. Homogeneous mixture
C. Heterogeneous mixture
D. Pure substance
C. Heterogeneous mixture
400
Which of the following best describes what happens when most substances change from a solid state to a liquid state?
A.The molecules slow down.
B.The molecules move farther apart.C.The molcules get smaller.
D.The molecules lose energy.
B.The molecules move farther apart.
500
Which two mixtures most likely resulted in a chemical change and the formation of a new substance? 
Mixture 1 and 4
500
Which of the following best describes a pure substance?
A. A material made up of more than one kind of particle
B. A substance that has the same composition throughout and cannot be separated by physical means
C. A combination of two or more things that are not chemically bonded
D. A mixture that looks the same throughout
B. A substance that has the same composition throughout and cannot be separated by physical means
500
A student burns a piece of wood in a campfire. Which observation shows that a chemical change has occurred?
A. The wood turns into smaller pieces.
B. The wood turns into ash and produces smoke.
C. The wood becomes wet from rain.
D. The wood breaks into two pieces.
B. The wood turns into ash and produces smoke.
500
Stainless steel is best classified as—
A. An element
B. A compound
C. A pure substance
D. A mixture (alloy)
D. A mixture (alloy)
500
Which of the following have properties of both metals and nonmetals?
A.metals
B.metalloids
C.non metals
D.all of the above
B.metalloids