How many formula units make up 24.2 g of magnesium chloride (MgCl2) ?

If a decrease in temperature accompanies a reaction, what occurred? Question 1 options: Energy was released. Energy was destroyed. Energy was created. Energy was absorbed.

Which of the following Is true about semi-conductors -neither free eletrons nor hoes are considered charge carriers in a semi-conductor -exposing a crysal of a semiconductor to heat or light starts displacing valence electrons which then move

A scientist placed an air-filled ballon into a freezer and observes that the ballon shrinks. which best explains why this happens?

What does density have to do with the cycling of matter in earths interior

An isotope of oxygen has an atomic number of 8 and an atomic weight of 18. how many neutrons does it have

Describe the characteristic of chemical structure found at the core of each steroid hormone

A molecule has one carbon-carbon double bond and four monovalent atoms or groups. how many different geometric isomers exist for this molecule?

While waiting for your car to warm up one winter morning, you notice a liquid dripping from your tailpipe. You recently learned in chemistry class that combustion reactions occur in car engines.

Which of the following correctly describes how metals behave in an ionic bond? Metals lose their valence electrons and form positive ions. Metals lose their valence electrons and form negative ions.

A pharmacist measures the mass of a powdered drug. The mass is 506 mg. What is the mass in grams? Write your answer as a decimal.