Physical Science
What is the molarity of 15 grams of NaF dissolved in a total volume of 2 liters?
0.18 M
Johnt'e adds 4.1 moles of sugar and wants to make a 0.25 M solution with it, what will be the final Volume of solution?
16.4 l
How many valance electrons are in the outermost shell of Strontium (Sr, atomic number 38)
2
Argon has an atomic number of 18. How many neutrons does it have?
22
A 5 kg ball rolls at a constant speed of 30 m/s. Determine the kinetic energy of the ball.
2250 J
What is the electronegativity of this element? Cl?
3.16
A 15 kg car has a velocity of 2.0 m/s. Find the kinetic energy of the car.
30 Joules
The Atomic mass of Rubidium is 86. How many electrons does it have?
37
How many electrons are in the outermost shell of phosphorous (P, atomic number 15)?
5
The element that has 20 protons in its nucleus is called
Calcium
A reaction that removes energy from a system is called an exothermic reaction. True/False
False
Name the element with atomic number 12.
Magnesium
Who developed the periodic table of the elements?
Mendeleev
The rows from left to right, in the periodic table that classify elements based on their energy levels are called what
Periods
If a sulfur atom gained 3 protons what atom would be formed?
Potassium
Change in velocity divided by time is equal to
acceleration
Which of the following elements is not a transition metal?
actinium
The number of protons plus neutrons is called the
atomic mass
Elements in the periodic table are listed in order of
atomic number
What speeds up the rate of a reaction?
catalyst
A positively charged ion is called a/an
cation
Atoms that share electrons, do so with what type of bond?
covalent bond
Oxygen has 8 protons with an atomic number of 8. It has the same number of what?
electrons
The chemical properties of matter comes mostly from its
electrons
Pure substance that cannot be broken down into smaller substances chemically or physically
element
Which element has the largest electronegativity?
fluorine
Spinning a rock at the end of a string and it follows a circular path. If the string breaks, the rock will
follow a straight line path
Which of these forces opposes an object's motion?
friction
Concentration is measured in what?
g/L
Each vertical column of the periodic table
group
The top to bottom columns of the periodic table are called
groups
As atoms get heavier, they become smaller in size because
heavier atoms have more protons to pull electrons closer to nucleus
Two or more atoms of an element that have different atomic masses but the same number of protons (different number of neutrons) is called what?
isotopes
Uranium 235, Uranium-238, and Uranium 239 are different
isotopes
All of the following are types of potential energy except,
kinetic
An object stays in motion because of its
mass
Anything that has mass and takes up space
matter
Energy due to an objects position or motion is called
mechanical energy
A hard solid that is malleable, ductile and a great conductor of heat and electricity is called a/an
metal
Which of the following are electrically neutral?
neutron
Protons and what are found in the center of an atom?
neutrons
The atomic mass( in the nucleus) is equal to the number of protons and what other subatomic particle
neutrons
An element that is usually a gas or a brittle (weak) solid, not malleable or ductile and a poor conductor of electricity is a
non metal
The period number of an element is also equal to the number of what?
orbitals
Each horizontal row in the periodic table is called a
period
A table showing the elements arranged in order by atomic number
periodic table
The nucleus has what type of charge?
positive
Energy that an object has due to its position or arrangement
potential energy
How did the energy of the rock at the top of the cliff change by the time it reached the bottom?
potential energy changed to kinetic energy
Which of the following are electrically positive?
proton
Which of the following are located within the nucleus?
proton
The weight of matter comes mostly from its
protons
The atomic number is also equal to the number of
protons and electrons
Force is a vector quantity because it has
size and direction
Which of the following elements is a halogen
tennessine
The outermost electrons of an element are called
valence electron
An object's force times its displacement is known as its
work
