Law of Conservation of Mass
The Law of Conservation of Mass
What is matter cannot be created or destroyed?
Cutting a piece of aluminum foil results in this type of change.
What is a physical change?
Holding an ice cube causes this direction of heat movement.
What is “heat moves from your hand to the ice”?
Repeating the same measurement yourself several times is called this.
What is repetition?
When sugar dissolves in water, this prediction can be made about the total mass.
What is “the mass stays the same”?
If heating a substance causes new gases with different odors to form, this change has occurred.
What is a chemical change?
When two objects at different temperatures touch, heat will move in this direction.
What is “from the warmer object to the cooler one”?
When another class performs the same experiment to verify results, it is called this.
What is replication?
When a liquid inside a thermometer expands and rises, this happens to its mass.
What is “the mass stays the same”?
Water evaporates from a puddle on a hot day. The molecules remain the same, so the change is this type.
What is physical?
When the temperature increases, this happens in a reaction.
What is the speed increases?
The variable that a student measures in an experiment is known as this.
What is the dependent variable?
In a chemical reaction, the reactants have 120 g of mass. The products must have this mass.
What is 120 g?
A student observes a temperature increase when two liquids are mixed. This indicates this kind of change.
What is a chemical change?
Heat always moves from the object that is warmer to the object that is this.
What is cooler?
A well-substantiated explanation of some aspect of the natural world that is based on a body of facts that have been repeatedly confirmed.
What is a theory?
If gas escapes during a reaction, the mass of the products may appear to do this.
What is “decrease” (even though the total mass is still conserved)?
The definition of a chemical change.
What is a process in which one or more substances are transformed into new substances with different chemical properties?
A student places a cold soda can on a table. After 20 minutes, the can is no longer cold. This is because heat did this.
What is “moved from the room air into the can until they reached the same temperature”?
A student increases the amount of heat added to a reaction. This describes changing this part of the investigation.
What is the independent variable?