What are Observation, Question, Hypothesis, Experiment, Data, Conclusion.
100
List 3 examples of chemical properties
What is/are Density Boiling Point, Melting point, Freezing point
100
_________________ occurs at all temperatures and is why the water level of a glass of water left out over a period of time will decrease.
What is EVAPORATION.
100
Define COMPOUND:
What is a substance which is made up of 2 or more different types of atoms bonded together.
100
If you received a piece of gold jewelry as a gift, what property of matter would you investigate to confirm it was real gold?
What is DENSITY. The density of gold is always the density of gold. Gold is Gold.
200
Define Independent Variable and Dependent Variable
What is: Independent Variable is what the scientist manipulates or changes (manipulated variable) and the Dependent Variable is what the scientist measures or what responds to the independent variable (responding variable).
200
What happens to the molecules in a substance during a chemical change?
What is: they are re-arranged. Bond are broken and new bonds are formed.
200
When a substance goes directly from a solid to a gas (phase change).
What is SUBLIMATION.
200
Compare and contrast heterogeneous mixtures with homogeneous mixtures.
Heterogeneous Mixtures: You can see the individual components of the mixtures. Not uniform composition.
Homogeneous Mixtures: Uniform appearance throughout.
200
Water exists in all 3 phases on planet Earth. Give an example of each phase (do not just put solid, liquid, gas).
What is Iceberg Snow Hail Ice Shelves Ice Caps Glaciers Oceans Lakes Rivers Streams Rain Ponds CLOUDS/WATER VAPOR. Did I miss any?
300
What is a control variable in an experiment?
What is: a variable that does not change in an experiment. Something which is held constant.
300
List three examples of a physical change.
What is: Cutting Paper (etc) Changing the Shape, Texture, Volume, State of Matter.
300
On a "phase change" diagram there are level parts (slope=0) where no energy is gained. What is occurring in this section of the graph?
What is a PHASE CHANGE!!!!
300
You order a "House Salad" at a restaurant and when you receive it you want to remove the cucumbers, tomatoes, and green peppers. What method of separation makes sense to accomplish this goal?
What is HAND SEPARATION. Pick it out, picky eaters!
300
Two objects, A and B, have the exact same volume (18 mL) however they have different masses. If object B has a mass of 18 grams, and object A has a mass of 9 grams, which object has the lower density?
What is OBJECT A (0.5g/mL)
400
A student wanted to investigate the relationship between the number of paperclips added to a paper airplane and how far that paper airplane flew. Write a hypothesis.
What is: The more paper clips you add the further the plane will fly. Or, the more paper clips you add the shorter the distance the paper will fly.
400
What happens to the molecules in a substance during a physical change?
What is they stay the same, in their same molecular arrangement.
400
Water in a solid state is ___________ dense than water in a liquid state. Typically, substances in a solid state are _____________ dense than in their liquid state.
What is LESS and MORE
400
What separation method is used to separate a solid from a liquid?
What is FILTRATION
400
Compare and contrast mass with weight.
Mass is the amount of stuff (matter) in an object.
Weight is the effect of gravity on matter.
Mass does not change, weight can change (depending on gravity. think of astronauts)
500
A student wanted to investigate the relationship between the number of paperclips added to a paper airplane and how far that paper airplane flew. What are the independent and dependent variables in this experiment?
Independent: # of Paperclips added Dependent: How far the paper airplane travels.
500
Identify the following as either a physical or a chemical change: baking a cake, painting a house, cutting your hair.
What is: chemical, physical, physical.
500
Compare and contrast the arrangement of atoms and energy levels (and the motion) of atoms in a solid state with a gaseous state.
Solid: less energy and motion, definite shape.
Gas: more energy and motion, no definite shape.
500
Give 3 examples of homogeneous mixtures/solutions and 3 examples of heterogeneous mixtures.
Homogeneous Mixtures/Solutions: Sugar Water, Coffee, Tea etc.
Heterogeneous Mixtures: Pizza, Salad, Sandwich etc.
500
An irregular shaped rock is found to have a mass of 25 grams. By using the "water displacement method" you find the volume of this rock is 50mL. What is the density of the rock?