Which of the following is an example of a physical change in matter?

a. fizzing produced when magnesium metal is added to acid

b. bending of sodium metal

c. sodium metal exploding in water

d. magnesium metal burning with a bright white flame

How many grams are in a mole of hydrogen chloride (HCl) ?

Four galaxies are gravitationally bound, with each maintaining its own shape. What is this structure called?

Marcel conducts an experiment to test which stain remover works best on mustard stains. He wants to make sure that he does not make mistakes and has correct data in his experiment. What should Marcel do to make sure that his data are correct?

identify 2 changes of state that require energy to be used, and 2 changes of state that require the release of energy

What are the ways that heat moves? Heat moves from a cold object to a warm object. Heat only moves through air currents. Heat moves through conduction, convection, and radiation. Heat only moves through conduction and radiation.

What's the ratio of 80% hydrogen

Why is warmer near earth surface

A platinum wedding band contains 0.077 mol of platinum. How many atoms of platinum are in the 15-gram platinum wedding band?

In an ecosystem where 500,000 kcal of sunlight is available for producers, approximately how much chemical energy will be contained in secondary consumers?

Question 6 if a gas pressure gauge reads 32.0 psi, what is the pressure in inches of mercury? 165 in. hg 15.7 in. hg 65.1 in. hg 32.0 in. hg 6.19 in. hg