Chemistry Flashcards
(26 cards)
What is the atomic number of an element?
The atomic number is the number of protons in the nucleus of an atom.
Fill in the blank: The chemical formula for water is ___
H2O
True or False: An ionic bond is formed by the sharing of electrons.
False
What is the pH range of acids?
The pH range of acids is 0 to 6.
What is the process of a solid turning into a gas called?
Sublimation
Which gas is produced when an acid reacts with a metal?
Hydrogen gas
What is the largest group of elements in the periodic table?
Metals
Fill in the blank: The chemical symbol for sodium is ___
Na
What is the law of conservation of mass?
Mass is neither created nor destroyed in a chemical reaction.
Which type of reaction involves the breaking and forming of bonds?
Chemical reaction
True or False: All alkali metals are found in group 1 of the periodic table.
True
What is the main characteristic of noble gases?
They are inert and do not easily react with other elements.
What is the formula for calculating the number of moles?
Number of moles = mass (g) / molar mass (g/mol)
Which element is the most abundant in the universe?
Hydrogen
What is an endothermic reaction?
A reaction that absorbs heat from its surroundings.
Fill in the blank: The process of a gas turning into a liquid is called ___
Condensation
What is the term for a substance that speeds up a chemical reaction without being consumed?
Catalyst
What is the chemical formula for carbon dioxide?
CO2
True or False: A solution is a homogeneous mixture.
True
What are isotopes?
Atoms of the same element that have different numbers of neutrons.
What is the main product of combustion of hydrocarbons?
Carbon dioxide and water
Which part of the atom carries a positive charge?
Proton
What does the term ‘exothermic’ mean?
A reaction that releases heat to its surroundings.
Fill in the blank: The chemical reaction of photosynthesis converts ___ into glucose.
Carbon dioxide and water
