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Science Exam 2016 8

8th grade review for science exam in 2016 fall

QuestionAnswer
What is mass? The amount of matter in an object
What is volume? The amount of space an object fills
What is density? The amount of matter in a given volume
What do elements in the same group have in common? # of valence electrons
What do elements in the same period have in common? # of electron shells
What charge does a proton have? Positive
What charge does a neutron have? None/neutral
What charge does an electron have? Negative
What are the large numbers in chemical equations called? Coefficients
What do the large numbers represent? Molecules
What are the small numbers in chemical equations called? Subscripts
What do the small numbers represent? Atoms
What is an element molecule? A molecule composed of only one element
What is a compound molecule? A molecule made of more than one element
What is a chemical change? A change in which a chemical reaction takes place
What are the five evidences of a chemical reaction? Solid precipitate forms, temperature change, bubbles/gas, unexpected color change, odor produced
What is the Law of Conservation of Mass? Matter cannot be created or destroyed only transferred
What is an observation? Information gained using the five senses
What is an inference? What you think based on your observations
What is a hypothesis? You prediction for what will happen next using observations and inferences
What type of statement do you use when making a hypothesis? If this... then that.
What is the formula for speed? Distance divided by time
What is the formula for force? Mass times acceleration
What is Newton's first law? Law of Inertia
What is Newton's second law? Law of acceleration
What is Newton's third law? Law of action and reaction
Created by: shelbycolvin