Whenever matter undergoes a physical or chemical change no atom are created or destroyed

Technology changes the natural world to me human needs True Or False

What is the momentum of a 37-kg person riding south on an 18-kg bicycle at 1.2 m/s?

Sodium only has one naturally occuring isotope, 23 Na, with a relative atomic mass of 22.9898 u. A synthetic, radioactive isotope of sodium, 22 Na, is used in positron emission tomography. 22 Na has a relative atomic mass of 21.9944 u. A 1.

2H2 + O2 + 2H20 If you have 50 grams of hydrogen (H2), how many moles of water (H20) could be produced?

Write the balanced chemical equations for the reactions with products when 1. A piece of zinc is placed in a solution of Copper (II) Sulphate. 2. A piece of Aluminium dipped in Calcium Carbonate.

Is material that has a density of 0.2g/ml good for building a bridge or for making couch cushions

A solution of potassium cyanide, KCN, is made by dissolving 3.2 g of KCN in water. When this solution reacts with excess hydrochloric acid, HCl, it produces 0.30 g of poisonous hydrogen cyanide gas, HCN.

When carbon undergoes sp2 hybridization it forms

Give the formula for molarity

A 54-gram sample of an unknown material has a volume equal to 20 cm3. Based on its density, could the sample be aluminum? Explain