Elements and Compounds
Which of the following describes an element?
A. two or more atoms joined together by chemical bonds
B. it is found inside the nucleus of an atom
C. a substance that cannot be broken down into simpler materials
D. a substance made up of two or more substances
C. a substance that cannot be broken down into simpler materials
What type of element is dull and is a poor conductor of heat and electric current?
A. metal
B. metalloid
C. nonmetal
C. nonmetal
Which process is an example of a chemical change?
A. steam rising from hot soup
B. a metal railing rusting in the rain
C. a piece of wood shrinking as it dries out
B. a metal railing rusting in the rain
A student is trying to find the density of an object. She has measured its mass. What other measurement does she need to find its density?
A. weight
B. volume
C. length
D. temperature
B. volume
What is a force?
A. when everything moves
B. a push or pull on an object
C. when nothing moves
D. something from Star Wars
B. a push or pull on an object
Which of these substances is a compound?
A. oxygen (O)
B. helium (He)
C. water (H2O)
D. hydrogen (H)
C. water (H2O)
What are metalloids?
A. elements that are at the bottom of the Periodic table
B. elements that share properties of both metals and nonmetals
C. elements that turned into compounds
B. elements that share properties of both metals and nonmetals
Cutting paper is an example of a chemical change.
A. true
B. false
B. false
How do you test the hardness of a mineral?
A. using a streak plate
B. weigh the mineral and find density
C. scratch the mineral with an object or another mineral
C. scratch the mineral with an object or another mineral
When two forces exerted on an object are balanced, how does the motion of the object change?
A. It speeds up.
B. It slows down.
C. It moves at a constant velocity.
D. It does not experience a change in motion.
D. It does not experience a change in motion.
C6H12O6
How many different elements make up one molecule of glucose?
A. 3
B. 6
C. 12
D. 24
A. 3
A sample is shiny and malleable and also conducts heat and electricity well. How should the student classify this element?
A. nonmetal
B. metal
C. metalloid
B. metal
What happens to the substances involved in a chemical change?
A. They stay the same
B. They change in form
C. New substances are formed
D. The substances combine and mix
C. New substances are formed
What is the density of a mineral if its mass is 16 grams and its volume is 5 mL?
A. 3.2 g/mL
B. 21 g/mL
C. 4.3 g/mL
A. 3.2 g/mL
Which of the following is an example of potential energy?
A. a compressed spring
B. a fast motorcycle
C. a parachuter landing on the ground
D. a frog jumping across the lake
A. a compressed spring
Which of the following is an element?
A. H2O
B. NaCl
C. CO2
D. N
D. N
Where are the metalloids located on the Periodic Table?
A. right side
B. left side
C. zig-zag line or stair-step
C. zig-zag line or stair-step
Which of the following is NOT the result of a chemical change?
A. soured milk
B. rusted metal
C. melted butter
C. melted butter
Which type of mineral should the student expect the greatest luster?
A. a dull, chalky mineral
B. a rough, grey mineral
C. a shiny, metallic mineral
D. a clear, translucent mineral
C. a shiny, metallic mineral
What are the total forces acting on an object?
A. balanced force
B. unbalanced force
C. net force
D. total force
C. net force
What is the difference between a mixture and a compound?
A. compounds are formed chemically, while mixtures are formed physically
B. mixtures are more specific than compounds
C. there are no differences
A. compounds are formed chemically, while mixtures are formed physically
Which is NOT a type of metal?
A. gold
B. silicon
C. platinum
B. silicon
What types of changes are taking place when you chew your food and then digest your food? BE SPECIFIC.
Chewing food is a physical change because it is changing the shape and form of the food.
Digesting food is a chemical change because it is turning into a new substance (nutrients and waste).
How do I find the volume of an object if I have the mass and density?
A. V = M/V
B. V = D - M
C. V = M/D
D. V = M x D
C. V = M/D
Which of these is an example of the conversion of kinetic energy into gravitational potential energy?
A. a bicyclist coasting down a long hill
B. a car engine moving the car forward
C. a roller coaster car moving toward the top of the track
D. a thrown ball falling toward the ground after passing through the top part of its motion
A. a bicyclist coasting down a long hill