Which of the following is a physical change?

explosion

rotting of food

evaporation

rusting of iron

Most hottest month of the year

Which best describes a chemical reaction? A - the rearrangement of atoms by breaking and reforming chemical bond B - a reaction that absorbs heat from the surroundings C - a reaction that releases heat to the surroundings D - the rearrangement of

Consider the following reaction where Kp = 4.55*10-5 at 723 K: N2 (g) + 3H2 (g) ⇋ 2NH3 (g) a) If the three gases are mixed in a rigid container at 723 K so that the partial pressure of each gas is initially one atm, what will happen?

How many moles are 6.022 (10^23) atoms of sodium

Can you use endocytosis in a sentence

How many outmost electrons do lithium and potassium have

Which of the following is a heterogeneous mixture Air Salt water Steel Soil I think it's soil but I'm not positive

When 40.5 g of Al and 212.7 g of Cl2 combine in the reaction: 2 Al (s) + 3 Cl2 (g) - -> 2 AlCl3 (s) b) How many moles of AlCl3 are formed?

Which factor does not influence the rate of a chemical reaction? A. the concentration of reactants B. the surface area of reactants C. the presence of a catalyst D. the volume of the container in which the reaction occurs

Air currents move objects in the air. Explain how a convection current might affect the flight of a hot air balloon