Chem Unit 2 Lesson 1 Review Flashcards
Signs of a Chemical Reaction are…
- Colour Change
2.Heat is lost or released
3.formation of a gas( bubbling/odour)
4.formation of a solid ( precipitate)
a word equation is made up of…
a chemical reaction that uses the names of the reactants and products
A chemical reaction is made up of…
a chemical reaction that uses the
chemical formulas of the reactants and products with states of matter
A triangle over the arrow means…
Heat is required for the transition
50 •c over an arrow means…
A specific temperature is
required for the reaction
UV light over and arrow means…
Light energy is needed for the
reaction
An element over an arrow means…
A catalyst is required for the
reaction
The law of conservation mass is…
that, during a chemical reaction, the total mass of the reactants equals the total mass of the products
A catalyst is…
any substance that speeds up the rate of a chemical reaction, without being used up (it is not a product or a
reactant)
Diatomic molecules are
gases, unless otherwise indicated (except bromine, which is a liquid).
Diatomic molecules are molecules made up of…
2 of the same type of atom
(remember: H2, O2, F2, Br2, I2, N2,
Cl2)
Acids are always…
(aq) unless otherwise indicated.
Water is always…
(l) unless otherwise indicated.
Carbon dioxide and carbon monoxide
are…
Always gases
Metals, by themselves, are
always solid
(mercury is the only liquid at room
temperature).
