Chemistry Paper 1 AQA Flashcards
What is the atomic number of an element?
The atomic number is the number of protons in the nucleus of an atom.
True or False: Isotopes have the same number of protons but different numbers of neutrons?
True
Fill in the blank: The chemical formula for water is ____.
H2O
What is the pH range of acids?
The pH range of acids is less than 7.
What is the law of conservation of mass?
The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.
Which particle has a negative charge?
Electron
What is the chemical symbol for sodium?
Na
True or False: A catalyst increases the rate of a chemical reaction without being consumed.
True
What type of bond is formed when electrons are shared between atoms?
Covalent bond
What is the main component of air?
Nitrogen
Which gas is produced during photosynthesis?
Oxygen
Fill in the blank: The process of a liquid turning into a gas is called ____.
Evaporation
What is the term for a substance that speeds up a reaction but is not consumed?
Catalyst
What is the formula for calculating the number of moles?
Number of moles = mass (g) / molar mass (g/mol)
True or False: Metals generally have high melting points.
True
What is the main characteristic of noble gases?
Noble gases are inert and do not readily react with other elements.
What is the process of a solid turning directly into a gas called?
Sublimation
Which group in the periodic table contains alkali metals?
Group 1
What is the chemical reaction that occurs when an acid reacts with a base?
Neutralization
What is the unit of pressure in the SI system?
Pascal (Pa)
Fill in the blank: The atomic mass of an element is approximately equal to the number of ____ and ____ in its nucleus.
Protons and neutrons
What is the difference between an ionic bond and a covalent bond?
Ionic bonds involve the transfer of electrons, while covalent bonds involve the sharing of electrons.
What is the main product of combustion reactions?
Carbon dioxide and water
True or False: A solution is a homogeneous mixture of two or more substances.
True
What is the term for the energy required to break bonds in a chemical reaction?
Bond energy
Which law states that the volume of a gas is directly proportional to its temperature at constant pressure?
Charles’s Law
