CHEMISTRY EOY YR 9 Flashcards
(26 cards)
What are the main layers of the Earth’s atmosphere?
The main layers are the troposphere, stratosphere, mesosphere, thermosphere, and exosphere.
True or False: The troposphere is the highest layer of the Earth’s atmosphere.
False
What is the primary gas found in the Earth’s atmosphere?
Nitrogen
Fill in the blank: The process by which plants convert carbon dioxide and water into glucose and oxygen using sunlight is called _______.
photosynthesis
What is an atom?
An atom is the basic unit of matter, consisting of protons, neutrons, and electrons.
What particles are found in the nucleus of an atom?
Protons and neutrons
Which subatomic particle has a negative charge?
Electron
True or False: Metals are good conductors of electricity.
True
What is metallic bonding?
Metallic bonding is the electrostatic attraction between positively charged metal ions and delocalized electrons.
What is the main characteristic of ionic bonds?
Ionic bonds form when electrons are transferred from one atom to another.
What is a fuel?
A fuel is a substance that releases energy when burned or consumed.
Name one fossil fuel.
Coal, oil, or natural gas
What is combustion?
Combustion is a chemical reaction that occurs when a fuel reacts with oxygen to produce heat and light.
Fill in the blank: The chemical formula for water is _______.
H2O
What are renewable fuels?
Renewable fuels are energy sources that can be replenished naturally, such as solar, wind, and biofuels.
What is an alloy?
An alloy is a mixture of two or more metals, or a metal and another element.
True or False: All metals are solid at room temperature.
False
What is the primary use of aluminum?
Aluminum is primarily used for packaging, construction, and transportation.
What is the atomic number of carbon?
6
What type of bond is formed between two nonmetals?
Covalent bond
Fill in the blank: The outermost electrons in an atom are called _______.
valence electrons
What is the significance of the octet rule?
The octet rule states that atoms tend to bond in a way that gives them eight valence electrons.
What is the main component of natural gas?
Methane
What is a greenhouse gas?
A greenhouse gas is a gas that traps heat in the atmosphere, contributing to the greenhouse effect.
