Questions (51-75 Flashcards
Each element in an element family shares the same
Number of valence electrons
As the pressure of. A gas at constant temperature decreases, it’s volume
Increases
What method for determining buoyant force states that the buoyant force on an object in a fluid is an upward force equal to the weight of the fluid that the object displaced
Archimedes’ principle
A chemical property of copper is its
Reactivity
Which of the following is an example of a chemical change
Paint fading
When two hydrogen atoms bond, the positive nucleus of one atom attracts the
Negative electron of the other atom
Which of the following is not a potential sign of chemical change
Evaporation. Of water
Because they differ in number of protons in their nuclei and in numbers of electrons in their filled inner energy levels, elements in a group
Are not exactly the same
A gas becomes a liquid through a process called
Condensation
Which compounds have carbon-carbon double bonds
Alkenes
How many atoms are in a single molecule Fe2O3
5
The engine of a car left running for long period of time becomes hot because
Energy is transferred from burning gasoline
Carbon and other nonmetals are found in which area of the periodic table?
On the right side
The mass of a 20L sample of gas with a density of 0.04 mg/L is
0.8 (hint: multiply 20 by 0.04)
Democritus’s original atomic theory was revised because it
Did not have a scientific basis
