Which of the following is a chemical reaction?

A. Breaking a glass pane

B. Freezing water

C. Digestion of food

D. Cutting down a tree

E. Evaporation of rubbing alcohol

What would be an example of a landform from magma? a. Hot springs c. Dome Mountains b. Lava plateau d. Shield Mountains

Which species should have the shortest bond length? A.) N2 B.) O2 C.) SO2 D.) SO3

Calculate the molality of a solution formed by adding 26.0 g NaCl to 74.0 g of water at 10.0 °C. The density of this solution is 1.203 g/mL at 10.0 °C. The molar mass of NaCl = 58.44 g/mol and the molar mass of H2O = 18.02 g/mol.

Apply the law of conservation of energy to explain how energy is conserved when water evaporates?

Aluminum metal reacts with chlorine producing a spectacular display of sparks: 2al (s) + 3 cl2 (g) à 2alcl3 (s) δho = - 1408.4 kj how much heat is released when 7.5 g of metal react with excess chlorine

How would each of the following procedural errors affect the results to be expected in this experiment? Give your reasoning in each case. (A) Not all of the liquid was vaporized when the flask was removed from the water bath.

What volume of 2.00 m must be added to 150.0 ml of 1.00 m chloroacetic acid to produce a buffer solution having a ph of 3.30?

What is the mass (g) of 500. ml water if the density is 0.9901 g/ml?

Predict what the population of the United States will be in the year 2010

Assume we could alter the conditions in the duodenum. Which of the following would be consistent with inserting a large volume of highly acidic chyme which contained a large amount of fat?