Which of these is a chemical change

a / fire works eploding

b/grinding powder

c/iorning shirt

How many times smaller than a proton is an electron?

Name three subatomic particles. Describe the mass, relative mass, and charge of each one

Sodium an alkali metal and chlorine a halogen are both in period 3 of the periodic table which element has a higher ionization energy

Which tool was most likely used in a procedure if the lab report shows that approximately 300ml of water was used

How many milliliters of a 1.25 molar HCL solution would be needed to react completely with 60 g of calcium metal Ca+2HCl - - > CaCl2 + H2

How many hydrogen atoms are in 2.80 mol of ammonium sulfide?

What is a large oval structure that directs all of the cells activities?

HBr + H₂SO₄ SO₂ + Br₂ + H₂O What is the oxidation number of the oxidizing agent? What is the oxidation number of the reducing agent?

How do find the volume of 60.0g of ether if the density is. 70g/mL?

A population of crabs live on a light-colored sandy beach. In this environment there is a population of birds that eat the crabs. One year, there is a volcanic eruption near the beach and dark volcanic ash covers the beach.