Deck 2 (21 - 40) Flashcards
1
Q
- PIC
A
2
Q
- The number of lone pairs in the molecule of water is?
A
2
3
Q
- How many electrons are present in an atom of calcium that has the electron configuration 1s2, 2s2, 2p6, 3s2, 3p6, 4s2 ?
A
20
4
Q
- Determine the oxidation number of carbon in K2CO3 ?
A
+IV
5
Q
- What is true in regard to single-displacement reactions?
a. only one product is formed
b. there is only one reagent
c. it requires oxygen
d. one element replaces another in a compound
A
d. one element replaces another in a compound
6
Q
- How many electrons are in the 5p sub shell?
A
6
7
Q
- For which element stays the chemical symbol K?
A
potassium
8
Q
- What would be the mass percentage of a solution made by mixing of 150g of 10% HCl and 100g of 25% HCl ?
A
W = 16%
9
Q
- PIC
A
10
Q
- Which of the diatomic element has a double bond between its atoms ?
a. hydrogen
b. nitrogen
c. oxygen
d. chlorine
A
c. oxygen
11
Q
- Sodium sulfate is a:
a. homogenous mixture
b. compound
c. heterogenous mixture
d. mixture of elements
A
b. compound
12
Q
- Saturated fatty acids have …….. covalent bonds:
a. triple
b. double
c. single
d. ionic
A
c. single
13
Q
- Acids have a pH that is:
a. lower than 7
b. higher than 7
c. equal to 7
d. between 9 and 14
A
a. lower than 7
14
Q
- What element is present in all organic compounds ?
a. carbon
b. oxygen
c. nitrogen
d. hydrogen
A
a. carbon
15
Q
- Give the name to:
HOOC - COOH
A
ethanedioic acid
