Science Warm-Up 4/9

Widespread use of fossil fuels for energy and industrial activities has increased carbon dioxide emissions by 50% since the 1760's.

Which connections between carbon dioxide and the change in Arctic sea ice cover is supported by this diagram?

• Arctic sea ice cover has remained unchanged despite rising levels of CO2 emissions.

• Arctic sea ice cover has increased because of stronger ice formed by carbon dioxide emissions.

• Arctic sea ice cover has decreased, likely due to the climate warming from carbon dioxide emissions.

• Arctic sea ice cover naturally fluctuates each year and is unaffected by carbon dioxide emissions.

Which plant adaptations is BEST for allowing the plant's seeds to be spread by animals as they rub against the plants?

• 
• 
• 
• 

The bubbles are tested and contain oxygen.

Which cell structure is responsible for the formation of oxygen bubbles?

• Chloroplast

• Cytoplasm

• Mitochondria

• Vacuole

What is occurring in the experiment?

• Pure substances combine and form a new pure substance.

• Pure substances combine and form a mixture.

• Mixtures combine and form a new mixture.

• Mixtures combine and form a pure substance.

A student claims that vinegar and baking soda interact when they combine.

Which TWO observations support the students claim?

• Bubbles are produced.

• A color change occurs.

• The mass changes.

• An odor is produced.

• The temperature changes.

What can be concluded about the motion of the particles in the beaker during the reaction?

• The particles are moving faster after the reaction because the temperature is decreasing.

• The particles are moving slower after the reaction because the temperature is decreasing.

• The particles are moving faster after the reaction because the solid is disappearing.

• The particles are moving slower after the reaction because the solid is disappearing.

Which particle diagram best represents the carbon dioxide produced in the reaction?

• 
• 
• 
• 

What is the total mass of the reactants greater than the total mass of the products?

• Acetic acid turns into water, which causes the products to lose less mass.

• The temperature changes, which causes the products to have less mass.

• Some of the baking soda is destroyed by the vinegar, causing the products to have less mass.

• Some of the carbon dioxide leaves the beaker, causing the products to appear to lose mass.

Which solution can the student make so that an egg will have no change in mass?

• Mix equal amounts of Salt Solutions 1 and 3.

• Mix equal amounts of Salt Solutions 2 and 3.

• Mix equal amounts of pure water and Salt Solution 1.

• Mix equal amounts of pure water and Salt Solution 2.

Which part of the skin allows a person to feel movement of the hair?

• Body fat accumulated near the hair follicle.

• Blood vessels taking the blood to the hair follicle.

• Movement of muscles attached to the base of the hair.

• Sensory nerves present at the base of the hair taking information to the brain.