Law of Conservation of Mass
This scientific law states that matter is neither created nor destroyed during a chemical or physical change.
What is the Law of Conservation of Mass?
This type of change results in a new substance with different properties.
What is a chemical change?
Generally, doing this to the temperature will cause a chemical reaction to happen faster.
What is increasing it (heating it up)?
This is a well-supported explanation of why or how a natural phenomenon occurs.
What is a scientific theory?
When a scientist performs the same experiment over and over again in multiple trials to ensure their results are consistent.
What is repetition?
If you mix 10g of baking soda with 20g of vinegar in a sealed container, this will be the total mass of the products.
What is 30g?
Chopping wood, shredding paper, and melting wax are all examples of this type of change.
What is a physical change?
At a molecular level, heat makes atoms move faster, causing them to do this more often and with more energy.
What is collide?
This describes a specific pattern or event in nature that always happens under certain conditions, often expressed as a math equation.
What is a scientific law?
When a different scientist in a different lab follows the original scientist's "recipe" to see if they get the same results.
What is replication?
When a log burns, the mass of the ash is less than the original log. This is the "invisible" place where the rest of the mass went.
What are gases (or smoke/carbon dioxide/water vapor)?
This common indicator of a chemical change is seen when vinegar and baking soda are mixed.
What are bubbles or fizzing?
We store milk in the refrigerator to achieve this effect on the chemical process of spoiling.
What is slow it down?
True or False: If a scientific theory is proven enough times, it eventually "graduates" and becomes a scientific law.
What is False?
We do this "R" to find the average of our data and reduce the chance that a single "fluke" or mistake ruined our results.
What is repetition?
True or False: If you melt a 500g block of ice, the resulting liquid water will have a mass of slightly less than 500g.
What is false?
While boiling water produces bubbles, it is considered a physical change for this reason.
What is because it is still water?
A glow stick in this temperature of water will be the dimmest.
What is cold water?
A common mistake is thinking that a theory becomes a law once it is "proven." In reality, they remain different because a Law describes a pattern while a Theory provides this.
What is an explanation?
This "R" is how the scientific community verifies that a new discovery is actually real and not just a mistake made by one person.
What is replication?
A student triggers a chemical reaction between a 10g piece of calcium carbonate and 50g of hydrochloric acid in an open beaker. After the bubbling stops, the final mass of the beaker and its contents is only 58g. Based on the Law of Conservation of Mass, identify how much mass "escaped" and what state of matter it was in.
What is 2g of gas?
You observe two different liquids being heated.
Liquid A begins to bubble and turn into a gas at 100°C, but the gas can be cooled back into the original liquid.
Liquid B begins to bubble and release a gas at 25°C when a powder is added, and the original liquid cannot be recovered.
Identify which liquid underwent a chemical change and explain the specific evidence that proves it.
What is Liquid B? The change occurred at room temperature (indicating a reaction, not boiling) and it is irreversible, meaning a new substance with new properties was formed.
On a graph showing "Reaction Rate" vs "Temperature," the line would typically move in this direction.
What is upward (a positive or direct correlation)?
Because theories are based on a massive body of evidence, they are considered "Durable." This 7-letter word means they are unlikely to be overturned, but they can still be ________.
What is modified (or updated/refined)?
If a scientist conducts an experiment 5 times and gets the same result, but no other scientists can get that result in their own labs, the experiment lacks this.
What is reliability/replication?