Which statement describes a change that occurs during a chemical reaction

Which electromagnet would have the most strength? A) An electromagnet with 5 coils. B) An electromagnet with 10 coils. C) An electromagnet with 15 coils. D) An electromagnet with 20 coils.

If an atom gains or loses an electron it tends to become what?

Calculate the mass of 1.23*1024 helium atoms. express your answer in grams of helium.

What type of reaction is Zn + 2HCl > ZnCl2 + H2 Combustion, Synthesis, Decomposition, Single Displacement, Double Displacement, or Acid-Base Neutralization

True or false The more particles and object has any given temperature the more thermal energy it has

Lake michigan holds 1.35 x 10^15 gallons of water

N which orbitals would the valence electrons for selenium (Se) be placed? s orbital and f orbital s orbital only s orbital and p orbital d orbital only

Anne prepares a solution of copper nitrate with a concentration of 30 g/dm³. What mass of copper nitrate did she add to 100cm³ of water, in grams?

Chemists classify an element an element as a metal based on what physical properties

What is the mass of 222 ml of ice if the density of ice is 0.92 g/ml?