How do u find which is physical or chemical changes

Samantha bought 450 rolls of toilet paper for her family to use while they are stuck at home. There are 4 people in her family.

How many molecules are in 2.00 miles of h2o

The correct answer obtained from subtracting 1.2 from 123.96 contains how many significant figures

Ill upvote For which of the following is the velocity constant (speed/direction does not change) ? Question 5 options: A cat escaping a dog by running in a straight line and then up a tree at a constant speed of 30 mph A cat escaping a dog by

How many milliliters of water at 23 °C with a density of 1.00 g/mL must be mixed with 180 mL (about 6 oz) of coffee at 95 °C so that the resulting combination will have a temperature of 60 °C?

How the law of conservation of mass could be useful for investigating chemical changes

The law of definite composition states that every compound has a definite composition by mass. What does that mean?

Equilibrium is established in a reversible reaction when: a) the [product] = [reactants] b) rate of reaction of products = rate of reaction of reactants c) all the reactants dissolve or dissociate d) when product are no longer produced

Convert 12.0 kilograms into grams. Convert 4.3 meters into centimeters. Convert 900 milligrams into grams. Convert. 7 millimeters into centimeters.

When does carbon dioxide absorb the most heat energy