3.8 & 3.9 Chemical Reactions
What is always produced in a chemical reaction?
What is a new substance?
An object that is NOT moving.
What is a stationary object?
True or False: a beam balance measures the weight of an object.
What is false - it measures the mass of an object?
What type of force has no effect on objects, effectively rendering them motionless (stationary)?
What is balanced force?
Fill in the blank: objects can float on water because water exerts an upwards pushing force called...
What is upthrust?
What is the color changes, bubbles or fizzes (creates a gas), explodes, emits light, produces a solid (precipitates), produces an odor (smell) or produces heat?
The amount of push or pull exerted upon an object.
What is force?
True or False: The mass of an object never changes, regardless of what planet it is on or where it is in space?
What is true?
When one force is greater than another.
What is unbalanced force?
Fill in the blank: for an object to float, the _________ must be equal to the force of ________________ exerted by the water.
What is weight / upthrust?
A substance that undergoes a change during a reaction.
What is a reactant?
The unit of force.
What is newtons?
True or False: Mass is measured in N/kg or N/g.
What is false - it is measured in kilograms or grams?
Name 3 effects of force on moving objects.
What is stop moving, change direction, speed up or slow down?
Name two factors that can also make a difference to whether an object floats or not.
What is shape and mass?
A substance formed in a chemical reaction.
What is a product?
Explain the difference between mass and weight.
What is mass tells you how much matter is in an object and weight tells you how much force is exerted upon an object by gravity?
Name the factor that causes an object's weight to change.
What is gravity?
Fill in the blank. A force from one object can act on another object even if the objects are not _______________ each other.
What is touching?
BONUS: What type of graph is best suited for measuring changes over time?
What is a line graph?
Name 3 examples of a chemical change/reaction.
What is cooking, burning, rotting, digesting, exploding, or rusting?
Draw a force diagram of a book being pushed across a table.
What is (see example)?
True or False: Mass is a force and changes as a result of gravity.
What is false - weight changes, but mass stays the same?
Draw a force diagram of a car accelerating.
What is (see example)?
BONUS: A gas cylinder has a net weight of 6.3kg. The gross weight of the cylinder is 15kg.
Calculate the tare weight.
What is 8.7kg? (15kg - 6.3kg = 8.7kg).