What changes in physical properties can be used as evidence that a chemical reaction has occured?

How much heat is required to boil 18g of water?

Ohanna is studying what happens to the energy as a ball rolls down a ramp. What is she studying? Check all that apply. gravitational potential energy electrical energy kinetic energy mechanical energy elastic potential energy

Is a metalloid malleable or brittle

How would you remove a metal spoon from a pot of boiling water without getting burned?

How many moles are in 10 grams of CaCl2?

Which is part of the niche of the American pikas? A. They climb mountains. B. They feed on dead organisms. C. They build nests far out on tree limbs. D. They find shelter between rock fragments.

How many moles of KCl will be produced from 15.0 g of KClO3?

According to kinetic molecular theory, collisions between gas particles in a sample of an ideal gas (1) increase the energy content of the gas sample (2) produce strong attractive forces between the gas particles (3) result in a net loss of energy

How do transmittance, absorbance, and molar absorptivity differ? Which one is proportional to concentration?

A particular alloy is made of two metals. The density of one of the metals (call it metal A) is 3.0 g/cm3. The density of the other metal (call it metal B) is 5.0 g/cm3. If the density of the alloy is 4.