Long Quiz

Front 1

What laboratory safety rule is violated by Rick, as shown in the picture?

Back 1

chemical safety

Front 2

In connection to number 2, what should Rick have done?

Back 2

Rick must use the wafting technique instead of inhaling directly the chemical towards his nose.

Front 3

Back 3

Increase fire

Front 4

Back 4

Creates fire

Front 5

Back 5

Hazardous to the aquatic environment

Front 6

Back 6

Corrosive to metals

Front 7

Back 7

Aspiration hazard

Front 8

Back 8

Skin irritation

Front 9

Back 9

Acute toxicity

Front 10

Back 10

Oxidizing liquids

Front 11

Back 11

Compressed gases

Front 12

Back 12

Explosive

Front 13

Back 13

Physical hazards

Front 14

Back 14

Health hazards

Front 15

Back 15

Environmental hazards

Front 16

What substance is oxidized

Back 16

Mg(s)

Front 17

What substance is reduced?

Back 17

CO2+(aq)

Front 18

What is the oxidizing agent?

Back 18

CoSO4(aq)

Front 19

What is the reducing agent

Back 19

Mg(s)

Front 20

Which statement is true about bleaching agent?a. It is an oxidizing agent because it losses electrons as it reacts to stain on clothes.b. Chlorine bleach releases hydrogen peroxide which reacts with chromophore that causes color.

c. Oxygen bleach is safer to on fabrics because it contains sodium hypochlorite, a milder stain removal.d. It breaks the bonds of the chromophore, colored pigment on clothes, which results to fading of the color.

Back 20

D

Front 21

Which explains the color pigment of stains?a. The color pigment is caused when the chromophore absorbs all light from the visible spectrum.b. The color we see is wavelength reflected while the rest of the wavelengths in the visible spectrum is absorbed.c. The see the wine stains as red because it reflects the visible spectrum while the rest of the electromagnetic waves are absorbed.d. all of the above

Back 21

B

Front 22

Given the experiment on bleaching stains, what substance is reducing agent?

Back 22

Stain/dyed cloth

Front 23

What happens to the electrical conductivity of water when salts of silver nitrate are added?

Back 23

Increases

Front 24

What refers to solutes that conduct electricity?

Back 24

Electrolytes

Front 25

What cell produces electric current through spontaneous redox reaction?

Back 25

Voltaic cells

Front 26

What substance is the anode electrode?

Back 26

Fe(s)

Front 27

What substance is the cathode electrode?

Back 27

Ag(s)

Front 28

Which shows the correct oxidation half-reaction?

Back 28

Front 29

Which shows the correct reduction half reaction?

Back 29

Front 30

What is the value of its standard cell potential?

Back 30

1.24v

Front 31

Which is false about the salt bridge?a. The salt bridge maintains neutrality of the aqueous solutions in each half-cell.b. The negative ions will move to the anode to balance the highly positive aqueous solution. c. The positive ions will move to the cathode to balance the highly negative aqueous solution.d. It is made up of porous gel, containing weak electrolytes that can easily migrate to each half-cells.

Back 31

D

Front 32

Which shows the correct oxidation half-reaction?

Back 32

Front 33

Which shows the corresponding reduction half-reaction?

Back 33

Front 34

What is the value of its standard cell potential?

Back 34

3.21v

Front 35

Which is true about radioactive nucleus?

Back 35

The radiation emitted during nuclear decomposition is the carrier of the excess energy

Front 36

What happens during alpha decay?

Back 36

The mother nucleus atomic number decreases by for 2 and its atomic mass by 4.

Front 37

What is the daughter nucleus is Radon-220 undergoes alpha decay?

Back 37

Polonium 216

Front 38

What is the daughter nucleus is Radon-220 undergoes alpha decay?

Based on the answer of number 28, how many are its protons?

Back 38

84

Front 39

What is the daughter nucleus is Radon-220 undergoes alpha decay?

Based on the answer of number 28, how many are its neutrons?

Back 39

132

Front 40

What refers to the rate at which a sample decays?

Back 40

radioactive decay

Front 41

Strontium has a half-life of 28.1 years. If the isotope contains 1.00 g, how many grams will be left after 65 years?

Back 41

0.20g

Front 42

Strontium has a half-life of 28.1 years. If the isotope contains 1.00 g, how many gramswill be left after 65 years?

What is the decay constant in number 32?

Back 42

0.0247

Front 43

The radioactive decay of TI-206 to Pb-206 has a half-life of 4.20 minutes. Starting with 5.00 x 10" atoms of TI-206, how many atoms are left after 42.0 minutes?

Back 43

4.89 x10^19

Front 44

The radioactive decay of TI-206 to Pb-206 has a half-life of 4.20 minutes. Starting with 5.00 x 10" atoms of TI-206, how many atoms are left after 42.0 minutes?

What is the decay constant?

Back 44

0.165