The masses of reactants is always greater than the masses of the products in a chemical reaction, because the products are combined together. TRUE FALSE

What is a catalyst?

Which of the following is NOT true according to the kinetic theory of gases? a) molecules occupy negligible volume b) molecules move randomly in straight line paths c) molecules are NOT attracted to one another d) molecules lose energy after

Identify the examples of diffusion in the list below. Check all that apply. A teacher takes the cap off a permanent marker. A few minutes later, students at the back of the classroom complain about the odor of the marker.

G which atomic orbitals overlap to form the carbon-carbon σ bonding molecular orbital of acetylene, c2h2?

Which of the following is a characteristic of most non-metals and is not a characteristic of most metals? A. Replaces the hydrogen in acids to form stable compounds B. Is malleable and ductile C.

How do intra-specific and inter-specific relationships within a community maintain biodiversity by preventing competitive exclusion?

Which of the following processes is endothermic? A. a hot cup of soup (system) cools on a countertop B. the combustion of butaneC. the chemical reaction in a "hot pack" often used to treat sore musclesD. the vaporization of rubbing alcohol E.

Every water molecule has two hydrogen atoms bonded at one oxygen atom. This fact supports the concept that elements in a compound are

What is the mass of 9 atom (s) of copper in grams?

Andy has two samples of liquids. Sample A has pH of 4, and sample B has a pH of 6. what can Andy conclude about these two samples? Sample A is a neutral b alkali c acidic Sample B is a neutral b alkali c acidic