Science Midterm
Questions from Previous Quizzes in Ms. Odden's 8th Grade Science
Terms
undefined, object
copy deck
- what is a solution?
- a solution is a mixture that is hard but not impossible to seperate.
- Who is Bohr and why is he important?
- Bohr was a philosopher who discovered that chemical bonding happens in the outermost electron shell.
- H3PO4- what kind of element is it
- base (acids end in H bases end in O or OH)
- what is suspension?
- when two objects become mixed together and are easily seperated
- what is chromatography?
- a method of analyzing mixtures by seperating them.
- Define molecule.
- two or more atoms chemicall bonded together
- define density.
- the amount of mass per volume of an object
- What are the four general properties all matter has?
- All matter has mass, density, volume and weight.
- If you are absent from school, when should you see the teacher to find out what you missed?
- before school on the day you return
- How would you find the Rf factor?
- You measure to the dots and to the point where the liquid stops. you then divide the dots by the water line measure.
- What is the building block of matter
- atom
- What are the 4 states of matter?
- Liquid, solid, gas, and plasma.
- What kind of elements are on the periodic table?
- metals, nonmetals, and gasses
- What is the pattern of an electron shell?
- 2, 8, 8, 18, 18, 32
- What is the Phase change for a solid to a gas?
- sublimation
- How would you calculate the density of an object?
- mass/volume (answer should be given in grams/cm [squared])
- What is the independent variable?
- the variable that determines the change of an experiment
- What four things speed up a chemical reaction?
- temperature, surface area increase, use of catalyst, use of concentrate