This is a reaction where energy is released in the form of heat or light.
What is exothermic
100
This produces new substances by changing the way the atoms are rearranged.
What is a chemical reaction.
100
The arrow in the chemical equation.
What is a yield sign.
100
Chemical equations must be this.
What is balanced.
100
Exothermic reactions produce a ___ in temperature.
What is increase.
200
This is the amount of energy needed to form bonds.
What is bond energy.
200
These are found at the beginning of a chemical reaction.
What are reactants.
200
This is where you make something new.
What is a chemical change.
200
This was the french chemist that showed that matter can never be created or destroyed.
Who is Laviosier.
200
All common __ reactions are exothermic.
What is combustion.
300
These are found at the end of a chemical reaction.
What are products.
300
This is a reaction where heat is absorbed.
What is an endothermic reaction.
300
This is where an object changes states of matter but still remains the same substance.
What is a physical change.
300
Only these can be changed in order to balance chemical equations.
What is coefficients.
300
Sometimes endothermic reactions absorb energy as this type of energy.
What is electrical.
400
This is the item added to a chemical reaction that speed it up.
What is catalyst.
400
This is a solid substance that is formed with you mix two liquids.
What is a precipitate.
400
These are the 4 pieces of evidence that a chemical reaction has taken place.
What is color, precipitate, gas, and temperature change.
400
Balance the equation:
HgO + Cl2 -> HgCl + O2
What is 2HgO + Cl2 -> 2HgCl + O2
400
This is the equation for endothermic reactions.
What is reactants + energy -> products.
500
This states that mass is neither created nor destroyed by chemical reactions. The mass of the products in a chemical reaction must equal the mass of the reactants.
What is the law of conservation of mass.
500
This tell you how many molecules take part in a reaction.
What is a coefficient.
500
These are the 4 items that can affect the rate of a chemical reaction.
What is concentration, surface area, temperature, and catalyst.
500
Balance the equation:
Na + Br2 -> NaBr
What is 2Na + Br2 -> 2NaBr.
500
These reactions can happen in living things such as fireflies.