20. Which of the following is a method of purifying water? A. Adding iodine B. Freezing C. Aeration D. Fixation

Which of these are examples of physical changes? Check all that apply. burning wood freezing water cutting paper iron rusting mixing water and acetone

During the day, is air over water warmer then the air over land

Which of the following natural disasters can contribute to the increase of greenhouse gases? hurricanes tornadoes volcanoes tsunamis

When comparing certain amino acid sequences in the protein hemoglobin of humans to those of other animals, scientists found that baboons had seven different amino acids (than the human protein), dogs had ten different amino acids, gorillas had one

One chemical property that can be measured in a substance is its reactivity with water. What is another chemical property? Density flammability solubility malleability

5. Differences in which property allow the separation of a sample of sand and seawater by filtration? A) concentration of ions B) volume of sample C) mass of sample D) particle size

Describe the reaction of a weak acid and a strong base. In general, what will the final pH be when the reaction between equal moles of a weak acid and a strong base is complete?

Which is the balanced chemical equation for the reaction of nitrogen (n2) with oxygen (o2) to form no?

What cells are chicken eggs made from

What is the study of matter called? O A. Chemistry O B. Philosophy O O C. Biology D. Physics