Deck 15 (281 - 300) Flashcards
1
Q
- Which process represents a chemical change?
a. oxidation
b. sublimation
c. evaporation
d. condensation
A
oxidation
2
Q
- PIC
A
3
Q
- PIC
A
4
Q
- In a reaction, the ions of two compounds exchange places in aqueous solution to form two new compounds. This reaction is called:
a. synthesis reaction
b. decomposition reaction
c. single-displacement reaction
d. double-displacement reaction
A
double-displacement reaction
5
Q
- PIC
A
6
Q
- Vinegar and oil form:
a. a homogenous mixture
b. a chemical change
c. a compound
d. none of the previous answers
A
none of the previous answers
7
Q
- PIC
A
8
Q
- What is the range of the pH scale from lowest to highest?
A
0 to 14
9
Q
- PIC
A
10
Q
- Give the number of lone pairs in the molecule of nitrogen
A
2
11
Q
- Identify non-reducing sugar:
a. maltose
b. fructose
c. sucrose
d. lactose
A
sucrose
12
Q
- Evaporation of mercury is:
a. mercury does not evaporate
b. a chemical change
c. a heterogenous mixture
d. a physical change
A
a physical change
13
Q
- Write the reaction between formic acid and methyl alcohol
A
HCOOH + CH3OH -> HCOOCH3 + H2O
14
Q
- PIC
A
15
Q
- 50g of substance A and 100g of substance B were dissolved in 350g of solvent. Calculate mass fractions of substances A and B in the prepared solution
A
WA = 0.1
WB = 0.2
