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NMAAAAT > Chemistry (CEM) > Flashcards

Chemistry (CEM) Flashcards

1
Q

What do you call a substance that increases the rate of a chemical reaction without being used up in a process.

A

Catalyst

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2
Q

If X is an element belonging to group IIIA of the periodic table, what would be the formula of its oxide?

A

X2O3

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3
Q

Which of the following elements is the most electronegative?

N
C
F
O

A

F

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4
Q

Which of the following is NOT true of group II elements, Be, Mg, Ca, Sr, Ba and Ra?

Be is the most active metal among them
Ra has the lowest ionization potential
Ca is bigger than Mg
They have relatively low electronegatives

A

Be is the most active metal among them

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5
Q

The solubility of KClO3 at 60 degrees Celsius is 25g per 100g of water. If at 60 degrees Celsius, 15g of the salt is dissolved in 50g of water, then the solution myst be

A

Supersaturated

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6
Q

A volume of 1.1 liters of O2 was collected inside a ballon at 295 K and 13.6 psi. The next day, the surrounding conditions were observed to be 32 degrees Celsius and 0.98 atm. What is the volume of the gas inside the balloon? (1 atm =14.7 psi)

A

1.070 liters

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7
Q

Which of the following solutions has a different molarity?

6 N H3PO4
4 N Ca(OH)2
8 N HC2H3O2
2 N HN4OH

A

8 N HC2H3O2

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8
Q

Element Electronegativity
K 0.8
Cl 3.0
H 2.1
O 3.5
C 2.5
N 3.0

Which of the following compound is the bonding ionic?

A

KCl

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9
Q

Which act as sources of energy in times of prolonged hunger and insulate the body against loss of heat?

A

Fats

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10
Q

A 100mL solution contains 4g of NaOH. If 50mL of water is added to this solution, which will remain unchanged?

A

Number of moles of NaOH

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11
Q

In NaCl, the bond between Na and Cl is

A

Ionic

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12
Q

What is the normality of an acid solution if 50mL of the solution requires 48.61mL of 0.1879 N alkali for neutalization?

A

0.1827 N

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13
Q

Substance Mass(g) Volume(mL)
K 10 20
L 20 10
M 5 1
N 20 5

Based on the table shown above, which substance will float in water?

A

K

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14
Q

An element has three naturally occurring isotopes of masses 23.9924, 24.9938, and 25.9898. These have abundances of 78.6%, 10.1%, and 11.3%, respectively. What is the average atomic mass of this element?

A

24.3

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15
Q

Oxides of nonmetals with water form acids while oxides of metals with water form bases. Which of the following will be acidic in water?

Carbon dioxide
Calcium oxide
Barium oxide
Magnesium oxide

A

Carbon dioxide

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16
Q

Sample Weight of A(g) Weight of B(g)
T 7 12.5
V 28 25.0
W 25 14.0
R 14 37.5
S 14 25.0

Five samples containing elements A and B are analyzed. Four of them are pure compounds, the other is a mixture. Results of the analysis are given in the table. Which two samples are the same compound?

A

T and S

NMAAAAT (3 decks)

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