Which of the following is the best indication that a chemical change has taken place?

a. The matter changes color.

b. A mixture separates into layers.

c. The change is reversible.

d. The shape of the substance changes.

A 30.0 L sample of nitrogen inside a rigid, metal container at 20.0 °C is placed inside an oven whose temperature is 50.0 °C. The pressure inside the container at 20.0 °C was at 3.00 atm.

One symptom of carbon monoxide poisoning is the development of Mees lines on the finger - and toe - nails.

Does Monocercomonoides still meet the definition of a eukaryote? Why or why not?

What part of an acid's chemical formula is responsible for acidic properties?

The most massive star known in the universe is thought to be R136a1, which may be as much as 256 times the mass of our sun. What do R136a1 and our sun have in common? A) They have the same amount of helium. B) They have the same amount of hydrogen.

Which of the following has primary responsibility for eliminating alcohol from the bloodstream

A hydrocarbon with only single bonds is classified as a. an alkene. b. an alkyne. c. saturated. d. unsaturated.

How many liters of 2M solution can be made using 500. grams of KI?

How many moles of copper are present in a sample of tennantite with a mass of 2370 grams

The Calvin cycle is another name for the