PSC 1515 Exam 1 Qs

In a scientific experiment, a control

*a test that duplicates an experimental test except for one variable *a way to study the effects of just one experimental variable

On average, what percentage of the energy in one trophic level becomes incorporated into the next higher trophic level?

10 %

If you exert 100 J in 50 s, your power output is

2 W

Entropy is closely related to the

2nd law of thermodynamics

A TV set is pushed a distance of 2 m with a force of 20 N that is in the same direction as the set moves. How much work is done on the set?

40 J

Suppose you rapidly stir some raw eggs with an eggbeater. The temperature of the eggs will A) increase. B) decrease. C) remain unchanged.

Increase

Why is metal shiny?

Sine a metal sheet has a low surface area, the light waves can bounce off of it in the same direction

Why can't we see atoms?

We see with light energy and the wavelength is larger than the object and so it is not reflected.

Which statement best describes a compound?

a material that is made up of a combination of atoms bonded together

What is the name of the following compound CaCl2

calcium chloride

A neutron makes a better nuclear bullet than a proton or an electron because it

carries no electrical charge

Fungi that consume dead organic matter are

decomposers

Which of the following statements describes an isotope?

element with the same number of protons but different number of neutrons

When a car is braked to a stop, its kinetic energy is transformed to

heat

The concept of a chemical bond is

how two or more atoms are held together

Scientists repeat experimental findings in order to

improve upon experimental design; eliminate unseen errors

As a system becomes more disordered, entropy

increases

Which of the following would not be considered matter?

light

Metals are both good heat conductors and good electrical conductors because of the

looseness of outer electrons in metal atoms

Oxygen atoms are used to make water molecules. Does this mean that oxygen, O2, and water, H2O, have similar properties?

no compounds are different from the elements theyre made of

A solid is not considered fluid because

of the fixed arrangement of its atoms or molecules.

Which of the following best describes ionic bonding?

one atom giving up some of its electrons to another atom

The repeating trends that take place when examining the elements are called ________.

periodicity

Which of the following describes a non metal?

poor conductor of electricity

Lions are

secondary consumers

The statement, "There are regions beneath Earth's crust that will always be beyond the reach of scientific investigation" is

speculation

the mass number of an element is

sum of protons and neutrons

Which of the following is a scientific hypothesis?

the moon is made of green cheese

Oxygen, Sulfur, Selenium, Tellurium, Polonium are similar chemically because

their outermost shell contains the same number of electrons

Gases are so much easier to squeeze into smaller volumes than liquids or solids because

there is so much space between the subatomic particles

Galileo's interpretation of motion differed from Aristotle's in that Galileo emphasized

time rates

When an object is lifted 10 m, it gains a certain amount of potential energy. If the same object is lifted 20 m its potential energy gain is

twice as much