The table below gives the densities of air and water.
Substance
Density (grams/centimeter)
0.00123
air
water
1.00
Using the data in the table, describe how a light wave changes as it travels from the air into water.
A, It slows down because water is more dense than air.
B, It speeds up because water is more dense than air.
C, It slows down because water is less dense than air.
D, It speeds up because water is less dense than air.

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.

Which of the following is an indication that a substance has undergone a chemical change? a. no new product has been formed. b. the color of the substance has not changed. c. the original constitute has not changed. d. the molecular structure has changed.

How does climate change cause the ocean's thermohaline current to slow down?