A liquid is heated and a solid forms at the bottom of the beaker. Is this a physical or chemical change?

Sodium hydroxide, NaOH, is a strong base that is used in industrial synthesis and processes such as making paper. What is the mass of 2.20 * 1022 molecules of NaOH (Molar mass = 40.0 g/mol) ? Express the mass in grams to three significant figures.

Carbon-14 has a half-life of 5,730 years. Suppose a fossil from a mammal contains one-fourth of its original amount of carbon-14. How old is the sample?

There are 24 cans of soda per case of soda and there are 12.0 fluid oz of soda per cans of soda. how many mL of soda are there in the case of soda?

This element has 2 electrons it its outermost energy level and belongs to the 3rd period

An aqueous solution is saturated in both potassium chlorate and carbon dioxide gas at room temperature. what happens when the solution is warmed to 85 ∘c

What type of fuel must be most carefully contained and protected

The bacteria and fungi that break down the plant and animal is classified as?

Which term best describes the substances that cause oil and water molecules in salad Dressing to interact and mix? surfactants miscible liquids immiscible liquids compressed molecules

C3H8 + 5O2 - > 3CO2 + 4H2O According to this equation, which ratio of oxygen to propane is correct? 1 - 5 grams O2 / 1 gram C3H8 2 - 5 moles O2 / 1 mole C3H8 3 - 10 grams O2 / 11 grams C3H8 4 - 10 moles O2 / 11 moles C3H8

Which diagram is the correct electron dot diagram for magnesium?