Physical or Chemical?
This type of change occurs when a substance changes its appearance, such as shape or state, but its chemical identity remains the same.
What is a physical change?
This scientific law states that in any change, matter is neither created nor destroyed.
What is the Law of Conservation of Mass?
Generally, increasing the temperature of a system will cause a chemical change to happen at this relative speed.
What is faster?
This characteristic property is calculated by dividing an object's mass by its volume
What is density?
This is a well-supported and widely accepted explanation of why or how something happens in the natural world.
What is a (scientific) theory?
The formation of a precipitate, an unexpected color change, or the release of gas bubbles are all primary "clues" that this type of change has occurred.
What is a chemical change?
If you break a 50-gram glass vase into ten pieces, this will be the total mass of all the shards combined.
What is 50 grams?
We keep milk in a refrigerator because the lower temperature does this to the chemical process of spoilage.
What is slows it down?
Whether you have a tiny copper paperclip or a massive copper pipe, this property—the temperature at which it turns to liquid—remains exactly the same.
What is melting point?
This describes a specific relationship or pattern in nature, often using math, to tell us what will happen under certain conditions.
What is a (scientific) law?
When liquid water reaches 100 degree C and turns into water vapor, it is undergoing this specific type of physical change.
What is boiling point (or a change of state/phase change)?
In a chemical reaction where 10 grams of vinegar reacts with 5 grams of baking soda in a sealed bag, this is the total mass of the products inside the bag after the reaction.
What is 15 grams?
When two chemicals are mixed and the temperature of the beaker rises from 22 degree C to 45 degree C, it is a strong indicator that this has occurred.
What is a chemical change (or reaction)?
In a solution of saltwater, the salt is known as the solute, while the water acting as the dissolving medium is known by this term.
What is the solvent?
When a student performs five separate trials of their own experiment to ensure their data is consistent, they are practicing this.
What is repetition (or multiple trials)?
Digesting food in the stomach or a silver spoon tarnishing over time are both examples of this category of change.
What is a chemical change?
A student notices the mass of a campfire's ashes is much less than the mass of the original wood. This "missing" mass was actually released into the atmosphere in this form.
What is gas (or smoke/carbon dioxide/water vapor)?
At a molecular level, an increase in temperature causes particles to move faster and collide more often, which explains why this type of change accelerates.
What is a chemical change?
A 20g sample of a mystery metal has a volume of 2 cm3. Using the formula D = m/v, this is the density of the metal.
What is 10g/cm3?
If a scientist in a different lab follows your procedures and gets the same results as you did, they have successfully performed this.
What is replication?
Mixing sugar into warm tea causes the sugar to disappear from sight, yet it can be recovered by evaporating the water. This identifies the process as this type of change.
What is a physical change (dissolving)?
To accurately demonstrate the Law of Conservation of Mass during a reaction that produces bubbles, a scientist must conduct the experiment in this type of "system" to prevent matter from escaping.
What is a closed system?
If a glow stick is placed in a bowl of water at 0 degree C compared to a bowl at 40 degree C, the stick in the 0 degree C water will appear dimmer for this reason.
What is the chemical reaction is occurring more slowly?
When a student continues to add sugar to a beaker of water until no more can dissolve and it settles at the bottom, the solution has reached this state.
What is saturation (or a saturated solution)?
Scientific theories can be changed or replaced if this is discovered through new technology or further experimentation.
What is new evidence?