Chemistry chpt 11

Why is distilled water used in chemical experiments rather than tap water?

• D Distilled water is a better solvent.
• A Distilled water contains fewer chemical impurities.
• Distilled water is a better solvent.

• Distilled water has a higher boiling point.

The air contains 78% of ​ (a)   and 0.004% of ​ (b)  

• nitrogen
• oxygen
• Co2
• argon
• helium
• hydrogen
• Neon
• Xenon

Which of the following human activities is most responsible for the increase in global temperatures?

• 1. Recycling

• 1. Water conservation

• 1. Reforestation

• 1. Industrial emissions

​ (a)   ​ ​ is the problem associated with the overuse of artificial fertilizers?

• Eutrophication
• Deforestation
• Soil Degradation
• Desertification

What metal is typically used as a catalyst in catalytic converters?

Answer explanation

The catalyst is made from platinum or a similar platinum-like metal such as palladium or rhodium.

Label the diagram

a

b

c

d

deforestation 

evaporation

condensation

rainfall

runoff

chemical reaction 

neutralization 

precipitation

Which of the following is a major component of artificial fertilizers?

• 1. All of the above

• 1. Potassium

• 1. Phosphorus

• 3. Nitrogen

What is the primary greenhouse gas emitted by human activities?

• 1. Carbon dioxide

• 1. Ozone

• 1. Methane

• 1. Nitrous oxide

Which of the following processes is essential for the purification of drinking water?

• 1. Condensation

• 1. Fermentation

• 1. Filtration

• 1. Evaporation

Which nutrient is commonly found in high concentrations in compost?

• 1. Magnesium

• 1. Calcium

• 1. Potassium

• 1. Nitrogen