Which technique is used to compare ink on a suspect document?

A) thin-layer chromatography

B) infrared spectrophotometry

C) blotting with alcohol method

D) ultraviolet spectrophotometry

A 110 g copper bowl contains 240 g of water, both at 21.0°C. A very hot 410 g copper cylinder is dropped into the water, causing the water to boil, with 8.60 g being converted to steam. The final temperature of the system is 100°C.

A quantity of 1.922 g of methanol (CH3OH) was burned in a constant-volume bomb calorimeter. Consequently, the temperature rose by 5.72°C. If the heat capacity of the bomb plus water was 9.

Maria hypothesizes that the amount of light in an environment affects the growth of algae living in that environment. Which of the following is the best type of investigation for Maria to perform in order to test her hypothesis? A.

Liquids have an indefinite shape and volume. is this true or false

Which of the following has can make 3 bonds? A-sodium (Na) B-Neon (Ne) C-Oxygen (O) D-Nitrogen (N)

List two potential problems with burning garbage.

Mole ratios how can the coefficients in a chemical equation be interpreted. True or False

For taking sip of hot tea, we blow air on it. Justify

The molecules in a solid object A. flow freely around each other B. vibrate slowly C. are completely still all the time

How many moles of water can be obtained from the reaction of 4 moles of O2?