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Chemistry > Deck 2 (21 - 40) > Flashcards

Deck 2 (21 - 40) Flashcards

1
Q
  1. PIC
A
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2
Q
  1. The number of lone pairs in the molecule of water is?
A

2

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3
Q
  1. How many electrons are present in an atom of calcium that has the electron configuration 1s2, 2s2, 2p6, 3s2, 3p6, 4s2 ?
A

20

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4
Q
  1. Determine the oxidation number of carbon in K2CO3 ?
A

+IV

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5
Q
  1. 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

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6
Q
  1. How many electrons are in the 5p sub shell?
A

6

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7
Q
  1. For which element stays the chemical symbol K?
A

potassium

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8
Q
  1. 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%

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9
Q
  1. PIC
A
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10
Q
  1. Which of the diatomic element has a double bond between its atoms ?

a. hydrogen
b. nitrogen
c. oxygen
d. chlorine

A

c. oxygen

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11
Q
  1. Sodium sulfate is a:

a. homogenous mixture
b. compound
c. heterogenous mixture
d. mixture of elements

A

b. compound

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12
Q
  1. Saturated fatty acids have …….. covalent bonds:

a. triple
b. double
c. single
d. ionic

A

c. single

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13
Q
  1. 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

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14
Q
  1. What element is present in all organic compounds ?

a. carbon
b. oxygen
c. nitrogen
d. hydrogen

A

a. carbon

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15
Q
  1. Give the name to:

HOOC - COOH

A

ethanedioic acid

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16
Q
  1. In which type of reaction do two or more compounds react to form one product ?

a. synthesis
b. decomposition
c. combustion
d. single-displacement

A

a. synthesis

17
Q
  1. Which compounds are isomers:

a. 1-propanol and 2-propanol
b. methanoic acid ethanoic acid
c. ethanol and ethyl alcohol
d. ethane and ethanol

A

a. 1-propanol and 2-propanol

18
Q
  1. Express the following quantity in milligrams: 2 kg
A

2, 000, 000 mg

19
Q
  1. Which of both polymers occur naturally?

a. starch and nylon
b. starch and cellulose
c. protein and nylon
d. protein and plastic

A

b. starch and cellulose

20
Q
  1. An element with electron configuration 1s2, 2s2, 2p6, 3s2, 3p6, 4s1 belongs to the:

a. halogen gas group
b. noble gas group
c. alkaline earth metal group
d. alkali metal group

A

d. alkali metal group

Chemistry (25 decks)

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