Properties and Changes
Is odor a physical property, chemical property, physical change, or chemical change?
Physical property
What is the phase change from gas to liquid?
Condensation
What property is demonstrated by two water droplets sticking together?
Cohesion
What is the name of the "ingredients" or the substances located on the left side of the chemical reaction arrow?
Reactants
What does the law of conservation of mass state?
Matter can not be created nor destroyed
Melting, freezing, and boiling are all what type of changes?
Physical changes
Complete the following blanks:
Evaporation is the phase change from ______________ to ________________
Liquid to gas
Explain the property of adhesion
Two different substances sticking together
If I have two reactants that are each 75 grams, then what could I expect the mass of the one product to be?
150 grams
Tell me the coefficients for this equation in order:
_____ H2 + ______O2 → ______H2O
2, 1, 2
What is the difference between a physical change and a chemical change?
A chemical change alters the chemical makeup of the substance.
What state of matter will you get if you heat a gas enough? Also, name one place where it can be found.
Plasma; Flames, Lightning, The Northern Lights, ect.
Explain why ice having a lower density than water is a good thing for aquatic organisms.
Describe a liquid in terms of its shape and volume
Indefinite shape and definite volume
Tell me the coefficients for this equation in order:
_____ KCl + _____ N2 → _____ K3N + _____ Cl2
6, 1, 2, 3
What is the difference between an extensive property and an intensive property?
An extensive property is dependent on the amount of matter while an intensive property is not
Rank the speed of the particles in a solid, liquid, and gas from slowest to fastest, then explain why those particles have a difference in speed.
Solid, liquid, gas; The difference in speed comes from a difference in temperature / kinetic energy.
Water is a universal solvent. What does this mean?
It has the ability to disolve many substances.
What does it mean to have an indefinite shape?
The substance will take on the shape of its container
Tell me the coefficients for this equation in order:
_____ MgO + _____ AlCl3 → _____ MgCl2 + _____ Al2O3
3, 2, 3, 1
List 3 signs of a chemical change
Change in temperature, formation of a precipitate, presence of bubbles, production of light, production of sound, color change, odor change, ect.
What is the phase change from solid directly to gas?
Sublimination
Explain what a hydrogen bond is
An interaction between two polar molecules that contain hydrogen wherein the positive end of one molecule forms an attraction with a hydrogen of another molecule.
What does it mean to be polar?
Have a positive end and a negative end of the molecule
Tell me the coefficients for this equation in order:
_____C8H8 + _____ O2 → _____ CO2 + _____ H2O
1, 10, 8, 4