Science questions (30 pts)

at 200 degrees f, substance 1 is a liquid, substance 2 is a solid, and substance 3 is a gas. which substance has molecules with no kinetic energy?

substance 1
substance 2
substance 3
none

chemical a and chemical b are mixed to make a new substance. the substance has a color different than either of the original chemicals. this would be an example of

chemical change.
physical change.

which is true about a block of ice in a closed container where the temperature is increasing but the pressure stays the same?

the water molecules will slow down.
the water molecules will have an increase in kinetic energy
the atoms in each water molecule will separate
the water molecules making up the ice undergo a chemical change

which is an endothermic phase change?

melting
freezing
condensation

Iguanas need to live in a habitat that is very warm, so the pet store warms their enclosures with "basking lights" which act as an artificial sun. describe how the three methods of thermal energy transfer may take place within the iguana's enclosure.

Bisphenol a (often called bpa) is a chemical found in products that people use every day, from water bottles to food containers to children's toys. unfortunately, bpa leaches out of its many products and makes its way into our bodies. what are the health effects of bpa exposure? ongoing research is finding that elevated exposure to bpa can affect a wide variety of developmental and physiological processes, but one of the first studies of bpa's health effects came about because of a simple mistake in the lab. at a laboratory at case western reserve university in 1998, geneticist patricia hunt was making a routine check of her female lab mice. as she extracted and examined developing eggs from the ovaries, she began to wonder what had gone wrong. she noticed that many of the eggs showed problems with their chromosomes, and some had irregular amounts of genetic material, which can lead to miscarriages and birth defects in mammals. she learned that a lab assistant had mistakenly washed the plastic mouse cages and water bottles with a harsh soap, releasing bpa from the plastic. knowing that bpa is an endocrine disruptor, a chemical that can enter organisms and mimic hormones, hunt set out to discover whether it had adversely affected her mice.

Match the following items 1. rr 2. rr 3. identical alleles 4. unlike alleles 5. rr ()homozygous, recessive ()homozygous definition ()heterozygous, dominant cell ()heterozygous definition () homozygous, dominant cell