A steak is cooked on the grill. this is an example of a:

a. physical change.

b. chemical change.

Index fossils are found throughout the world and come from organisms which existed during limited periods of geologic time. Which of the following best describes what index fossils can be used to determine? A. the age of a layer of rock B.

In creating a covalent bond, it would be best to bind sulfur to: Aluminum Sodium Neon Oxygen

If you measured the mass of an apple in New York, and then again in China, how would the masses compare? OA) The mass in New York would be larger. OB) The mass in New York would be smaller. OC) The masses in both locations would be the same.

If you breathe normally you have about 0.11 moles of air in your lungs and a volume of 2.4 L. If you then take a deep breath all the way, you will have 0.27 moles of air in your lungs. How big will your lungs be?

An empty 10-ml volumetric flask weighs 10.267 g. after filling to the mark with distilled water at 20°c, the mass is 20.219 g. what is the mass of water in the flask

Calculate the energy E of a sample of 3.50 mol of ideal oxygen gas (O2) molecules at a temperature of 310 K. Assume that the molecules are free to rotate and move in three dimensions, but ignore vibrations.

Gasohol is a fuel containing ethanol (c2h6o) that burns in oxygen (o2) to give carbon dioxide and water.

What type of rock does the ocean floor consist of? 1 Igneous basalt rock 2 Igneous granite rock 3 Sedimentary rock 4 Metamorphic rock

Consider the combustion of liquid methanol, ch3oh (l) : ch3oh (l) + 3/2o2 (g) →co2 (g) + 2h2o (l) δh=-726.5kj part a what is the enthalpy change for the reverse reaction?

Type in the correct number for each question in the text box provided. Consider the synthesis of one molecule of glucose.