Quiz | Atoms and Molecules
What is the chemical symbol of magnesium?
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
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
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
What is the nuclear symbol for an atom with the following subatomic particles: 8 protons, 8 neutrons, 10 electrons?
How do you name the acid HBr?