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6th Sci Unit 2
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What is one sign that a chemical reaction might have happened?
a color change, a gas, heat, etc.
In a chemical reaction, are the products at the start or the end?
what you have at the end
In a chemical reaction, are the reactants at the start or the end?
what you have at the start
Is dissolving a reversible change?
Yes, it is.
What are two ways to make a substance dissolve faster?
Stir, heat it, add more solvent
What does dissolve mean?
To mix evenly with another substance
The solute and solvent together make a ____________.
solution
Does the solute dissolve in the solvent or does the solvent dissolve in the solute?
the solute dissolves in the solvent
Name a physical change.
boiling, cutting, condensing, folding, etc.
Name a irreversible change.
baking a cake, burning, etc.
Name a reversible change.
Boiling and condensing
Name something that conducts electricity.
Metals, water, etc.
What is an electrical conductor?
Something that allows electricity to flow
Name something that doesn't conduct heat well.
Wood, plastic, etc.
Name something that conducts heat well.
Metals
We usually can't see or feel gases. Do they have mass?
Yes, they do.
What's the difference between boiling and evaporation?
Boiling - all particles boil, evaporation - particles at the surface evaporate
What is the boiling point of water?
100 degrees
What is the melting point of ice?
Above 0 degrees
What are the three states of matter?
Solids, liquids, and gases