Properties of Matter
List three characteristics of nonmetals.
Dull luster, low density, poor conductors of heat and electricity, not malleable, etc.
What kind of change alters the form of a substance, but not its chemical composition?
Physical change
What does the Law of Conservation of Mass state?
Mass can not be created or destroyed, only changed.
What property of water allows it to stick to other substances?
Adhesion
What is the formula for calculating density?
density = mass / volume
Which type of elements are typically shiny, conducts heat and electricity, and malleable?
Metals
What type of change rearranges the atoms of a substance composition?
Chemical change
If you start with 10 grams of reactants, how much mass will the products have?
10 grams
What do we call the tendency of water molecules to stick to each other?
Cohesion
If an object has a mass of 20 grams and a volume of 5 cm3, what is its density?
4 g/cm3
List one difference between metals and nonmetals.
Ex: Metals are good conductors of heat and electricity, while nonmetals are poor conductors.
Give two examples of a chemical change.
Popping fireworks, burning paper, cooking, digesting food, etc...
When 2Na reacts with Cl2, how many atoms of chlorine will be in the product?
two atoms of chlorine.
Why does water stick to a window after it rains?
Adhesion
Why do substances with a density greater than water sink?
They are heavier than water.
Elements that have properties of both metals and nonmetals are considered ______________.
During which type of change does energy often get absorbed or released?
Chemical change.
What happens to the total mass during a reaction?
It remains the same / constant.
What is responsible for a water bug to be able to walk on water?
Surface tension
If you have two objects with the same mass but different volumes, which one has a higher density?
The one with the smaller volume.
As an electrician you need to wire a new building with ethernet cables, what type of elements would you use to create the malleable wires?
Name one indicator that a chemical change is occurring.
Change in color, formation of gas, production of precipitate, release of heat, change in odor, etc...
Is the following chemical reaction balanced or unbalanced?
C2H6 + 2O2 ---> 2H2O + 2CO2
Unbalanced
When water freezes it becomes a solid and less dense than liquid water. When water is solid, will it sink or float?
Float
Change in state of matter (solid, liquid, gas)