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Learn: Atoms, Elements, and Compounds
GCSE AQA Combined Science: Trilogy — 8464
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Welcome!Today, we're diving into atoms, elements, and compounds. This is a key topic in chemistry that forms the foundation for understanding matter. Let's take it step by step!
What is an Atom?An atom is the smallest unit of matter that retains the properties of an element. It consists of a nucleus (protons and neutrons) surrounded by electrons. Atoms are the building blocks of all substances.
Quick check: Which part of the atom contains protons and neutrons?
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ElementsAn element is a substance made of only one type of atom. For example, oxygen (O) contains only oxygen atoms. Elements are arranged in the periodic table and cannot be broken down into simpler substances by chemical means.
Match the items on the left with their correct pairs on the right
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What is a Compound?A compound is a substance made from two or more different elements chemically bonded together. For example, water (H₂O) is formed when hydrogen and oxygen atoms bond chemically. Compounds have fixed ratios of elements.
Water is a compound made from {{blank0}} and {{blank1}} atoms.
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How are Atoms Held Together?Atoms are held together in compounds by chemical bonds. The main types of bonds are ionic (transfer of electrons) and covalent (sharing of electrons). These bonds give compounds their stability.
Which type of bond involves the transfer of electrons?
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Mixtures vs CompoundsUnlike compounds, a mixture contains two or more substances physically combined, not chemically bonded. For example, air is a mixture of gases like oxygen and nitrogen. Mixtures can be separated easily, while compounds cannot.
Which of the following are compounds? (Select all that apply)
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Review Time!Great work! You've learned about atoms, elements, and compounds. Now let's test your understanding with a few questions.
What is the smallest unit of matter?
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Match the items on the left with their correct pairs on the right
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An element is represented by a chemical {{blank0}} such as H for {{blank1}}.
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Which statements about mixtures are true? (Select all that apply)
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