MS Science Midterm Review

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

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

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

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

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

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

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

How many significant figures does the number 26.457 g have? none of the above

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

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

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

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

_______________is defined as mass per unit volume. density grams

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

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

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

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

What is conserved during any change? volume mass temperature shape

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

An object has a mass of 40. 0 g and takes up 2. 0 ml 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/cm3 20.0 g/L

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

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

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

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

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

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

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

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

A dog walks at an average speed of 4 m/s for 60 s 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

You are sliding down a ramp at a skate park at a speed of 5 m/s 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

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

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

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

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

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

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

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

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

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

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

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

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

An inclined plane makes doing work easier by__________. changing the direction of the input force increasing the input force increasing the distance so you can use less force decreasing the input force

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

How much force is needed to move an object with a mass of 10 kg at an acceleration of 5 m/s2?

Newton first described gravity while watching ___________. smoke rise a car accelerate someone walking an apple falling