MS Science. Midterm Review

Transcription

1 MS Science Midterm Review

2 A hypothesis is a reasonable and educated. test scientist guess experiment guess

3 To test a hypothesis, a scientist could conduct a(n). operation environment experiment inference experiment

4 Scientists can organize their observations using. charts graphs tables all of the above all of the above

5 is the application of knowledge learned through science. Experimenting Technology Testing Observing Technology

6 The results of an experiment must be. reproducible kept secret accepted right away not reproducible reproducible

7 A graph that shows the parts of a whole is a bar graph line graph circle graph or pie chart a curve circle graph

8 Which term describes how close measurements are to the correct value? significant figures accuracy precision estimation accuracy

9 How many significant figures does the number g have? none of the above 5

10 A change in the identity of a substance that cannot be reversed by physical means is an example of a. phase change physical change chemical change none of the above chemical change

11 is anything that has mass and takes up space. matter length density volume matter

12 The temperature at which a substance changes from a liquid to a gas is called the. freezing point melting point boiling point gas point boiling point

13 A characteristic that can be observed and measured is called a. physical property chemical property flammability mass physical property

14 is defined as mass per unit volume. mass volume density grams density

15 A process that does not change the identity of a substance is called a. physical property chemical property physical change chemical change physical change

16 . The temperature at which a solid becomes a liquid is called the. melting point freezing point boiling point condensation point melting point

17 The amount of material an object has in it is called its. matter mass volume length mass

18 Which of the following is an example that a chemical change has occurred? change in state broken pieces smoke change in shape smoke

19 What is conserved during any change? volume mass temperature shape mass

20 An object that sinks when placed in a beaker of water is water. more dense than less dense than the same density none of the above more dense than water

21 An object has a mass of 40.0 g and takes up 2.0 ml. What is the density of the object? 2.0 g/ml 20.0 g/ml 2.0 kg/cm g/l 20.0 g/ml

22 A(n) is a particle in an atom with a negative charge. proton neutron isotope electron electron

23 . Isotopes of an element contain different numbers of. protons neutrons electrons atoms neutrons

24 An atom of an element with atomic number 6 always has. six protons in the nucleus six electron clouds more than six neutrons an atomic mass of 6 six protons in the nucleus

25 Water and carbon dioxide are examples of. homogenous mixtures elements heterogeneous mixtures compounds compounds

26 are small particles that make up most types of matter on Earth. compounds mixtures atoms elements atoms

27 Salad is an example of a(n). heterogeneous mixture homogeneous mixture compound none of the above heterogeneous mixture

28 Salt water is an example of a(n). chemical compound homogeneous mixture heterogeneous mixture none of the above homogeneous mixture

29 . Susan rides her bike 5000 m in 100 seconds. Her average speed is? 5 m/s 5 miles/hour 50 m/s 50 mph 50 m/s

30 A dog walks at an average speed of 4 m/s for 60 s. How far does the dog walk? 24 m 240 m/s 15 m 240 m 240 m

31 You are sliding down a ramp at a skate park at a speed of 5 m/s. At the bottom of the ramp your speed increases to 15 m/s over a time of 2 s. Your acceleration is? 5 m/s/s 10 m/s/s 30 m/s/s none of the above 5 m/s/s

32 Distance traveled divided by the time taken to travel that distance equals. average speed acceleration force motion average speed

33 The speed of an object at any given moment in time is its. natural speed total speed average speed instantaneous speed instantaneous speed

34 Change in velocity, divided by the amount of time taken for the change, is. terminal velocity energy acceleration motion acceleration

35 A push or a pull is. speed acceleration simple machine force force

36 The rougher the surface, the greater the. gravity friction speed work friction

37 If forces are acting on an object, it will move. unbalanced balanced friction no unbalanced

38 Inertia of an object is directly related to its. speed mass shape volume mass

39 It would probably be easier to ride a bicycle across. a sidewalk the grass sand gravel a sidewalk

40 According to Newton s Third Law, forces always occur in pairs. equal but opposite unequal but complementary unequal but opposite equal but complementary equal but opposite

41 A compound machine is a combination of working together. wheels simple machines electronic parts none of the above simple machines

42 What is an example of a simple machine? scissors ramp car bicycle ramp

43 What are the units of force? Newtons Joules N/s m/s Newtons

44 Wood burning chemical popsicle melting physical baking a cake chemical breaking an egg physical adding sugar to your lemonade physical