Which process does not involve a chemical change? 1. cleaning the shower with lime away 2. burning charcoal on the grill 3. boiling water 4. digesting food?

What does the atomic mass come from on the periodic table

Metallic bonds form between ?

What does DNA and cell membrane have in common?

The longest chain of atoms in a particular molecule consist of seven carbon atoms. Which name might this molecule be called? A. butane B. ethylene C. heptyne D. Septane

There are many kinds of organisms in Kingdom Protista. Which of these organisms is in Kingdom Protista? A. seaweed B. virus C. bacteria D. fungi

Alcohols are polar molecules. true false

If a normal force of 500 N is acting on two surfaces in contact with a coefficient of friction equal to 0.50, what would be the maximum force of static friction?

Elements with the same number of shells are called? All the element that have the same number of valence electrons and have similar physical and che. ical properties are called?

How many moles are in 23.4 g

A chemist prepares hydrogen fluoride by means of the following reaction: CaF2 + H2SO4 - -> CaSO4 + 2HF The chemist uses 11 g of CaF2 and an excess of H2SO4, and the reaction produces 2.2 g of HF. (a) Calculate the theoretical yield of HF.