As salt is added to water the density of the solution increases so all of the salt- containing solutions here had a density greater than 1 g/mL. It is also possible

measure the density of solutions with densities below 1 g/mL using a hydrometer.

What modification would you have to make to your hydrometer to measure the

density of solutions significantly less than 1 g/mL?

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.

Which of the four hypothetical substances you investigated would be most harmful to living organisms? 50 points!

Air pressure is measured in pascals. for a professional american football game, the ball should be inflated to about 90,000 pascals. scientists studied the effects of air temperature on the pressure inside american footballs by taking these steps: 1. prepare 100 footballs. 2. measure each football's air pressure. 3. divide footballs into 10 groups. 4. place the groups in different lockers cooled to different air temperatures. 5. after 12 hours, remove the footballs from lockers. 6. measure each football's pressure again. 7. compare the new pressures to the starting pressures. what two terms best describe the variable "air pressure inside the football" in this experiment? independent, qualitative independent, quantitative dependent, qualitative dependent, quantitative