Quiz | Atoms and Molecules
What is the chemical symbol of magnesium?
The symbol of Magnesium in the periodic table is Mg
The sublimation is the transition of a substance...
from the gas to the solid state
from the solid to the gas state
from the liquid to the solid state
from the solid to the liquid state
Which of the following statements about chemical reaction is incorrect?
New atoms are created
Atoms can be rearranged
Atoms of molecules can be separated
Atoms are recombined to form new compounds
In a chemical reaction, atoms are rearranged, separated, or recombined to form new compounds but are not created or destroyed
Which of the following statements is correct?
Neutrons are located in the nucleus and have the same mass and charge than protons
An atom is mostly made up of empty spaces
The mass of an atom is evenly distributed throughout its volume
All of the above
Most of the mass of an atom is concentrated in its tiny nucleus
How many protons, electrons and neutrons does 40Ca2+ have (knowing that calcium is the twentieth element in the periodic table)?
20 protons, 20 neutrons, 18 electrons
20 protons, 20 neutrons, 22 electrons
20 protons, 40 neutrons, 18 electrons
22 protons, 20 neutrons, 20 electrons
Calcium is the 20th element in the periodic table ⇒ 20 protons
mass number = protons + neutrons = 40 ⇒ 20 neutrons
charge = protons – electrons = +2 ⇒ 18 electrons
What is the nuclear symbol for an atom with the following subatomic particles: 8 protons, 8 neutrons, 10 electrons?
Z = atomic number = number of protons ⇒ Z = 8
A = mass number = protons + neutrons ⇒ A = 16
Q = charge = protons – electrons ⇒ Q = - 2
How do you name the acid HBr?
Binary Acid Naming: hydro- + first syllable of the anion + suffix -ic + acid