1 What is the scientific method? Steps scientists use to answer questions and solve problems.

2 What is the first step of the Scientific Process? Ask a question or identify the problem

3 After you have asked the question, you are ready to… Form a hypothesis

4 Is it ok if your results do not support your hypothesis? YES

5 What should you do if your results do not support your hypothesis? Repeat investigation and change hypothesis if necessary

6 What is the importance of the International System of Units (SI)? It is the oldest and most widely used system

7 What are the SI units for measuring LENGTH, MASS, and VOLUME? Meter, Kilogram, and Liter

8 What happens to a solid object with a density that is less than water when it is placed in water? It floats on top of the water

9 Is the explosion of fireworks is an example of a PHYSICAL or CHEMICAL change? Chemical change

10 Is grounding/grinding flour an examples of PHYSICAL or CHEMICAL change? Physical Change

11 What has mass and takes up space? MATTER

12 What change of state happens if you open a bottle of perfume after a period of time? Evaporation

13 What is the melting point of ice the same as? The freezing point of water

14 Will a liter of water boil at the same temperature as a milliliter of water? YES!

15 What change of state is solid to gas? Sublimation

16 What change of state is EVAPORATION? Liquid to gas

17 What change of state is liquid to gas? CONDENSATION

18 What change of state is MELTING? Solid to Liquid

19 Are boiling point, melting point and density examples of physical or chemical properties? PHYSICAL

20 What is a pure substance made of two or more elements that are CHEMICALLY combined? COMPOUND

21 Is FLAMMABILITY an example of a physical or chemical property? CHEMICAL PROPERTY

22 When elements form mixtures, do the elements keep their properties or form a new substance? KEEP their same properties

23 Which is NOT an method of separating a mixture of solids: filtering, screening, evaporation? EVAPORATION

24 What is the smallest particle in which an element can be divided and still be the same substance? ATOM

25 Which of the following has a POSITIVE charge: proton, neutron, electron? PROTON

26 Which of the following has a NEGATIVE charge: proton, neutron, electron? ELECTRON

27 Which of the following has a NEUTRAL charge: proton, neutron, electron? NEUTRON

28 Where is the nucleus of an atom and what does it contain? Center and hold the protons and neutrons

29 What is the type of change when a new substance is formed with different properties? CHEMICAL CHANGE

30 With a hair dryer, electrical energy is changed into which type of energy: light, nuclear, thermal, chemical? THERMAL

31 When you eat fruits and vegetables, what type of energy are you taking in: thermal, sound, chemical, electrical? CHEMICAL ENERGY

32 When is POTENTIAL ENERGY the greatest in a roller coaster? At the top of the first hill

33 What is THE ABILITY TO DO WORK called? ENERGY

34 Conduction, convection, or radiation: when the end of a spoon in hot soup gets warm. CONDUCTION

35 Conduction, convection, or radiation: when water boils in a pot, the water moves in circular patterns? CONVECTION

36 Conduction, convection, or radiation: when the coils of a portable heater warm a room? RADIATION

37 Particles move fast, slide past one another. LIQUIDS

38 Particles move very fast independent of each other, bumping into each other wildly. GAS

39 Particles are attracted to each other and vibrate in place close together. SOLID

40 Why are protons and electrons attracted to each other? Protons have a positive charge and electrons have a negative charge…opposites attract!

41 What do you see by sprinkling iron filings around a magnet? Magnetic field lines

42 WHAT can be measured by counting how many waves pass by in a certain amount of time: frequency, wavelength, or wave speed? FREQUENCY

43 WHAT is the distance from any point on a wave to an identical point of the next wave: frequency, wavelength, wave speed? WAVELENGTH

44 WHAT is the speed at which a wave travels through a medium: frequency, wavelength, wave speed? WAVE SPEED

45 The SPEED of a sound wave depends on what? The substance through which it travels: the medium

46 WHITE LIGHT is the entire range of what? All the colors of visible light combined together

47 Which results in a helpful INCREASE of friction: sandpaper on wood, wax on skis, sand on an icy sidewalk? Sand on an icy sidewalk

48 Which results in a helpful DECREASE of friction: force applied while scrubbing, oil added to a car engine, deep tread added to snow tires? Oil added to a car engine

49 What illustrates MOTION by relating it to a reference point: hands of a clock relative to the numbers, the distance a race car travels, the velocity of a train? The hands of a clock

50 What are two factors used to determine the formula for speed: acceleration, velocity, distance, time, motion, reference point? DISTANCE and TIME

51 Explain the difference between speed and velocity. One has direction

52 To produce a change in motion, a force must be WHAT? UNBALANCED FORCE