Science-chemical equations

Question 1

What are the 6 indications a reaction(rxn) has occurred

Answer 1

1. Catches on fire
2. Produces a gas(smoke)
3. Color
4. Change in temperature
5. Light or sound
6. A precipitate is formed

Question 2

What are the ten things listed in chemical equations

Answer 2

1. Gas
2. Aqueous
3. Catalyst
4. Solid
5. Subscript
6. Reacts to form
7. Coefficients
8. Heat
9. Reactants
10. Products

Question 3

Terms

Answer 3

1. Aqueous: Dissolved in water
2. Catalyst: Makes the rnx happen faster and at a lower temp. Doesn’t take part of the rnx, doesn’t change
3. Heat: Reactant then the rxn is endothermic product “ “ “ is exothermic
4. Solid: It precipitates out of solution

Question 4

What are the 5 chemical reactions

Answer 4

1. Synthesis(S): 1 product; form A+X–AX
2. Decomposition(D): 1 reactant; form AX–A+X
3. Single replacement(SR): Cmpd and elements both sides; form Ay+X–Ax+Y
4. Double replacement(DR): All cmpds; form Ax+By–Ay+Bx
5. Combustion(C): HC+O2; form Hydrocarbon +02–CO2+H2O

Question 5

Balancing chemical equations

Answer 5

The # of atoms on the left=the # of atoms on the right
. Only use coefficients to balance(“How many, how do I fix it?”)
. DO NOT TOUCH THE SUBSCRIPTS!!!!