When the products of a reaction have less energy than the reactants:

The reaction is exothermic.

The reaction is endothermic.

The reactants lost internal energy.

The change in enthalpy is positive.

The research method. l That is also referred to as fieldwork is A. Secondary analysis B. The use of surveys C. Experimentation. D. Participant observation

The various atomic masses of the same element are called neutrino positron critical mass isotopes

Where do scientists think the abundance of water on Earth came from?

Following a volcanic eruption, which event is usually the last one to be observed

What happens when the student use a straw to blow a stream of air between the papers?

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