What criteria are used to distinguish between a chemical and physical change?

Which pair of elements do you expect to be most similar in their chemical properties? which pair of elements do you expect to be most similar in their chemical properties? ne and no and sibr and ik and fe?

What does promoters in chemical reaction improve

Why does boron not always continue the period 2 pattern of reacting by losing electrons, as do beryllium and lithium?

Human organ systems work together in many ways. Which statement accurately explains the relationship between two body systems? A. the excretory system regulates the temperature of the integumentary system. B.

a 15.6g sample of ethanol absorbs 868J as it is heat. what is the temperature change of the ethanol? assume that the most specific heat is 2.44 J/g C. is this endothermic or exothermic?

Write the chemical formula for each compound described. a) barium chloride (1 Ba ion, 2 Cl ion)

Acetonitrile (CH3CN) is an important industrial cheical. Among other things, it Is used to make plastic moldings, which have multiple uses, from car parts to Lego bricks. Which statement below about acetonitrile is FALSE? a.

State the difference between sugar in water and pebbles in water

What is the molar mass of Sr?

When protons and neutrons join together to make a nucleus, energy is?