Evidence of Chemical Change
What is the term for a solid that forms when two solutions react and create an insoluble product?
A precipitate
What type of change occurs when a substance changes form but not identity?
Physical Reaction
What do we call the starting substances in a chemical reaction?
Reactants
Why are careful observations important when identifying chemical reactions?
They help detect evidence of new substances forming.
A pot of hot water is boiling on the stove. Is a chemical reaction occurring?
No because no new substances is formed. it is only changing states from liquid to a gas.
Name one visible sign that a chemical reaction may be occurring.
What is color change, gas production (bubbles or steam), temperature change, or formation of a precipitate?
What type of change produces one or more new substances?
Chemical Reaction
What do we call the substances formed after a reaction occurs?
Products
What tool is commonly used to measure temperature changes during reactions?
A thermometer
Kidney stones are an example of ___________, because a bunch of the dissolved minerals in your body mix and form solid chunks of mineral and salt.
Precipitate
Why does bubbling often indicate a chemical reaction is happening?
Is melting ice a physical or chemical change?
Physical change
What word describes a substance that dissolves in water?
Soluble
OR
Solubility
What tool is commonly used to measure the mass of substances?
A balance
OR
A digital balance
What evidence shows that fireworks involve chemical reactions?
The light, heat, color and smell produced after the explosion.
How can a temperature change occur even if no heat is added from the outside?
Energy is released or absorbed during a chemical reaction?
Is rusting iron a physical or chemical change?
Chemical Change
What is a type of test that medical scientists perform to assess a medicine's effectiveness?
A clinical trial
Why should students record color, temperature, and appearance during experiments?
To find differences before and after the "reaction".
How does rusting show evidence of chemical change?
Iron reacts with oxygen to form iron oxide (rust).
Explain why odor change can be considered evidence of a chemical reaction.
New substances with different smells are being formed?
Explain one key difference between physical and chemical changes.
OR
Chemical Changes can be seen only during the reaction phase, whereas physical changes can be seen throughout the process
What is data that can be used to support a scientific claim or argument?
Why is safety equipment important during chemical investigations?
To protect your eyes, skin, and body from harmful chemicals.
Explain how a chemical reaction can be helpful in everyday life.
It allows cooking, cleaning, energy production, or manufacturing?