Science Grade 8 Mid Term Assesment

A. Balance Scale B. Weight is the measure of gravity on an object. Measured in newtons/pound C. Mass - measure of particles; constant Weight - gravity measure; changes w/ location

A. Density - Amount of mass in a given volume B. Solubility - Substance ability to dissolve in another substance C. Ductility - Ability to be pulled into a wire D. Malleability - Abililty of substance to be rolled or pounded into thin sheets E. State - Physical form in which matter exists F. Thermal Conductivity - Rate at which substance transfers heat

A. Tendency of an object to resist a change in motion. B. Get moving C. Stop

A. A property that describes a substance's ability to react or participate in a chemical reaction. Ex: Flammability, Reactivity B. Ash and Smoke C. Rust

A. definite, not definite B. definite, not definite C. not definite, not definite

A. One solid thing B. Plum pudding model; electrons spread around C. Discovered Nucleus and other particles D. Electrons travel on energy paths E. Discovered nucleous; electrons are found in clouds orbiting nucleus

A. A combination of substances that can be seperated by physical means B. A chemical combination of two or more elements which are combined chemically. C. A homogeneous mixture of two or more substances. D. Samples taken from different areas of the mixture would be the same.

A. Nucleus B. Positively charged particle found in the nucleus with amu of 1. C. A particle with no charge found in the nucleus with amu of 1. D. Tiny, negatively charged particle found circling the nucleus.

A. An atom or molecule that has gained or lost one or more electrons and has a negative or positive charge. B. An atom with the same # of protons as other atoms of that element but a different # of neutrons. C. Force of attraction between two oppositely charged ions. D. A bond formed when atoms share one or more pairs of electrons.

A. 2 B. 8 C. 8 D. Atomic

A. The + particles are protons. B. The neutral particles are neutrons. C. The white - particles are electrons. D. The rings around the nucleus are energy levels.

A. Bromothymol Blue turns yellow B. Glowing splint relights C. Buring splint makes the gas pop D. Bubbles; unexpected color change; production of a new substance

A. the smallest unit of an element that maintains the chemical properties of that element B. the mass of an atom expressed in atomic mass units C. the # of protons in an atom; same for all atoms of an element D. A substance that cannot be broken down into simpler substances by chemical means

A. an arrangement of the elements in order of their atomic numbers such that elements with similar properties fall in the same column or group B. Full outer energy level; Stable atoms called "Noble Gases" C. Missing 1 electron in outer energy level; makes ions w/ -1 charge D. 1 electron in outer level; makes ions with +1 charge E. 2 electrons in outer level(FULL); makes ions with +2 charge

A. symbol - H₂O + CO2 + Light Energy ----> C₆H₁₂O₆ + O₂ Word - Water + Carbon Dioxide & Light Energy produces glucose sugar and oxygen gas B. symbol - C₆H₁₂O₆ + O₂ -----> H₂O + CO₂ + Energy Word - Glucose sugar and oxygen gas produces water & carbon dioxide & energy C. Reactants ---> water, carbon dioxide Products ---> glucose sugar, oxygen gasD. D.Reactants ---> glucose sugar, oxygen gas Products ---> water, carbon dioxide