A) a toxic substance B) an unnatural additive placed in food C) any substance that is not alive D) any substance that has a definite composition
A) mathematical modeling B) the identification of the composition of materials C) the chemistry of living things D) non-carbon related compounds
A) the chemistry of living things B) crystals and minerals C) properties, changes, and relationships between energy and matter D) carbon-containing compounds
A) by accident B) in order go learn basic information C) long after the basis research is complete D) only to make money
A) to develop new products B) to understand an environmental problem C) to solve a particular problem. D) to gain knowledge
A) to learn basic information B) by accident C) in order to make money D) to solve a particular problem
A) amount of energy B) mass C) volume D) density
A) taking up space and having mass B) being brittle and hard C) the ability to carry an electric current well and to hold electric charge D) being malleable and ductile
A) the smallest unit of matter that maintains its chemical identity B) smaller than an electron C) always made of carbon D) the smallest unit of a compound
A) mass B) weight C) density D) volume
A) air B) light C) water vapor D) smoke
A) mass if often measured with a spring scale B) mass is expressed in pounds C) as the force of Earth's gravity on an object increases, the object's mass increases D) mass is determined by comparing the mass of an object with a set of standard masses that are part of a balance
A) burning B) grinding C) boiling D) cutting
A) burning B) melting C) rusting D) igniting
A) products B) equilibria C) synthetics D) reactants |