Phy Sci S2 Week 4 Exam Definitions

closeness of a measurement to the true value.

• Accuracy
• Nucleus
• Electron cloud
• Crystal
• Alloy

ionic compounds that produce positive hydrogen ions (H+) when dissolved in water

• Acids
• Chemical reaction
• Evaporation
• Nucleus
• Solute

energy needed for a chemical reaction to get started

• Activation Energy
• Falsifiable
• Isotope
• Electron cloud
• Valence electrons

a mixture composed of two or more elements, at least one of which is a metal.

• Alloy
• Chemical formula
• Products
• Condensation
• Condensation

smallest particle of an element that still has the element’s properties.

• Atom
• Compound
• Solid
• Kinetic theory of matter:
• Chemical Property

the number of protons in at atom. It is unique to a given element.

• Atomic number:
• Accuracy
• Plasma
• Proton
• Chemical reaction

ionic compounds that produce negative hydroxide ions (OH-) when dissolved in water

• Base
• Atom
• Evidence
• Chemical change
• Solvent

Difference in temperature between the boiling point of the pure solvent and that of the solution.

• Boiling point elevation
• Liquid
• Scientific law:
• Law of conservation of mass
• Change of state

a substance that increases the rate of a chemical reaction by lowering the activation energy without being used up in the reaction.

• Catalyst
• Evaporation
• Electromagnetic Force
• Metalloids
• Mass

occurs whenever matter changes from one state to another

• Change of state
• Photosynthesis
• Coefficient
• Scientific Method:
• Metallic bond