PHYSICAL OR CHEMICAL CHANGES
Dissolves sugar in water
What is physical change?
Has a definite shape and definite volume
What is solid?
Solid ice cube turns into water, a liquid.
What is melting?
The formula for density
What is p (rho) = m/V
This is the first step in balancing any chemical equation.
What is to list and count the elements present on each side of the arrow?
Burning gasoline inside car engine
What is chemical change?
The spacing between the individual particles are very far
What is gas?
You needed this to change the state of matter into another state.
What is adding or removing heat?
A student has a sample of aluminum that has a mass of 27g and a volume of 10cm3. What is the density of aluminum?
What is 3 g/cm3? Remember sig fig!
When balancing a chemical equation, you are able to add or change these.
What are coefficients?
Name a food that is an example of physical change.
Answer Varies
Has no definite shape or but it has a definite volume
What is liquid?
Liquid turns into gas by absorbing heat energy, we call this a/an __________reaction.
What is an endothermic reaction?
10 mL of gas A has a mass of 5g, and 10 mL of gas B has a mass of 50g. Which liquid is more dense?
What is gas B?
Balance the following equation:
_____H2 + ____O2 ---> ____H2O
What is 2 H2 + 1O2 ---> 2H2O?
Explain how the water cycle an example of a physical change.
What is YES, it is a physical change, because water changes from a liquid/solid when it precipitates, to a gas when it evaporates, then forms back into a liquid when it condensates. Then the process repeats again with the same substance, WATER!
Which of the following is NOT in a gaseous state at room temperature and normal atmospheric pressure? A. Silver B. Oxygen C. Hydrogen D. Nitrogen
What is A. Silver?
Molecules inside the matter do this when heat is added.
What is speeding up/moving faster?
A sample of iron has the dimensions of 4 cm by 6 cm by 8 cm. If the mass of this rectangular-shaped object is 300g, What is the density of the iron?
What is 2 g/cm3? Remember sig figs!
Balance the following equation:
____C3H8 + _____O2 ---> ____CO2 + ____H2O
What is 1C3H8 + 5O2 ---> 3CO2 + 4H2O?
Explain how photosynthesis (process in which plants produce their own food) is a chemical change.
What is YES, it is a chemical change, because plants take in CO2 , H2O and sunlight then converted them into glucose (food) and O2. This process creates new products and alters original reactants in the reaction.
Water is different from other substances because...
A It is more dense as a solid than a liquid
B It is less dense as a solid than liquid
C it is more dense as a gas than a liquid
D It is less dense as a solid than a gas
What is B. It is less dense as a solid than liquid? Ice floats on liquid water instead of sinks.
Liquid water do it when heat is added to its boiling point.
What is evaporate?
A graduated cylinder contains 20 mL of water has a mass of 25.0 g. An irregularly shaped rock with the mass of 10.0 g is placed into the graduated cylinder and the water rose to 35 mL. What is the volume of the rock? What is the density of the rock?
What are 15 mL volume and 0.67 g/mL?
Balance the following equation:
____P + _____O2 --->_____P2O5
What is 4P + 5O2 ---> 2P2O5 ?