Which change is exothermic?
a. freezing of water
b. melting of iron
c. vaporization of ethanol
d. sublimation of iodine
a
100
a shorter way to write a chemical reaction using symbols and numbers
What is chemical formula
100
H2 + O2 yields H2O; the H2 and O2 are
What are reactants?
100
write the chemical formula for water
What is H2O
100
when elements combine during a chemical reaction
What is synthesis reaction?
200
__Fe2O3 + __CO → __Fe + __CO2 The coefficient of CO is____
3
200
the arrow
What is "yields"?
200
Which phase change is an exothermic process?
a. CO2(s) → CO2(g)
b. Cu(s) → Cu(l)
c. NH3(g) → NH3(l)
d. Hg(l) → Hg(g)
c
200
write the chemical formula for carbon dioxide
What is CO2
200
When elements trade places during a chemical reaction
What is replacement reaction?
300
Given the equation: KNO3(s) H2O(l) KNO3(aq) As H2O(l) is added toKNO3(s) to form KNO3(aq), the entropy of the system
a. decreases
b. increases
c. remains the same
What is b.
300
the substances on the right side of the arrow in a chemical equation
What is product?
300
Where does the water come from :
2H2 + O2 yields 2H2O
What is from a chemical reaction?
300
an example would be the number 2 in H2O
What is a subscript?
300
this reaction is an example of:
2H2 + O2 yields 2H2O
What is a synthesis reaction?
400
Which formula correctly represents the product of an addition reaction between ethene and
chlorine?
a. CH2Cl2
b. C2H4Cl2
c. CH3Cl
d. C2H3Cl
What is b?
400
This reaction gives PbCl2(aq) + Na2CrO4(aq) → PbCrO4(s) + 2 NaCl(aq). 4 moles of NaCl are formed when _____moles of Na2CrO4 react completely
What is 2?
400
Write a balanced equation for:
CO2 + H2 yields H2O + C
What is CO2 + 2H2 yields 2H2O + C
400
two atoms of hydrogen combined with two atoms of oxygen
What is H2O2 (hydrogen peroxide)
400
This reaction is an example of
HCl + NaOH yields H2O + NaCl
What is replacement reaction?
500
Which compound contains both ionic and covalent bonds?
a. CaCO3
b. MgF2
c. PCl3
d. CH2O
What is a?
500
if the equation has the same number of atoms of each element on both sides of the arrow
What is a balanced equation?
500
a bottle of hydrogen peroxide that breaks down into a bottle of water and oxygen gas is an example of
What is a decomposition reaction?
500
one atom calcium combined with 2 atoms of chlorine
What is CaCl2
500
This reaction is an example of:
2NH4NO3 yields 2N2 + O2 + 4H2O