Year 10 Revision Flashcards
(27 cards)
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: The mass number of an atom is the sum of protons and electrons.
False
Fill in the blank: The chemical formula for water is _____ .
H2O
What is a covalent bond?
A covalent bond is a chemical bond formed by the sharing of electron pairs between atoms.
Which of the following is an alkali metal? A) Sodium B) Chlorine C) Helium
A) Sodium
What is the pH scale used for?
The pH scale is used to measure the acidity or alkalinity of a solution.
True or False: Acids have a pH less than 7.
True
What is the process of a liquid turning into a gas called?
Evaporation
Name the three states of matter.
Solid, liquid, gas
What is the chemical symbol for gold?
Au
What type of reaction occurs when an acid reacts with a base?
Neutralization reaction
Which gas is produced when an acid reacts with a metal?
Hydrogen gas
What is the law of conservation of mass?
The law states that mass is neither created nor destroyed in a chemical reaction.
Fill in the blank: The smallest unit of an element is called an _____ .
Atom
What is the difference between an element and a compound?
An element is a pure substance made of one type of atom, while a compound consists of two or more different types of atoms chemically bonded together.
What is the formula for calculating the number of moles?
Number of moles = Mass (g) / Molar mass (g/mol)
Which of the following is a noble gas? A) Oxygen B) Argon C) Nitrogen
B) Argon
What is the main component of natural gas?
Methane (CH4)
True or False: An exothermic reaction absorbs heat from the surroundings.
False
What does the term ‘electronegativity’ refer to?
Electronegativity refers to the ability of an atom to attract electrons in a chemical bond.
What is the formula for calculating density?
Density = Mass / Volume
Fill in the blank: The periodic table is arranged by increasing _____ .
Atomic number
What is the primary function of a catalyst in a chemical reaction?
To speed up the reaction without being consumed.
Which type of bond involves the transfer of electrons?
Ionic bond
