Atoms, Elements and Compounds part 2

What is the difference between an element and a compound?

• An element consists of two or more chemically combined substances, while a compound consists of only one type of atom.

• An element consists of two or more chemically combined atoms, while a compound consists of only one type of substance.

• An element is made up of only one type of atom, while a compound is made up of two or more chemically combined elements.

• An element is a mixture of different substances, while a compound is a single substance.

Answer explanation

What is the difference between an element and a compound?

• An element consists of two or more chemically combined substances, while a compound consists of only one type of atom.

• An element consists of two or more chemically combined atoms, while a compound consists of only one type of substance.

• An element is made up of only one type of atom, while a compound is made up of two or more chemically combined elements.

• An element is a mixture of different substances, while a compound is a single substance.

Answer explanation

What is a mixture?

• A combination of two or more elements chemically bonded together.

• A substance made up of only one type of atom.

• Contains two or more elements/compounds that are not chemically combined.

• A compound composed of two or more chemically combined elements.

Answer explanation

What is a metal and where are they found in the periodic table?

• Metals are found towards the right and top of the table. They gain electrons to form negative ions.

• Metals are found towards the left and bottom of the table. They lose electrons to form positive ions.

• Metals are found towards the right and bottom of the table. They lose electrons to form positive ions.

• Metals are found towards the left and top of the table. They gain electrons to form negative ions.

Answer explanation

What is a non-metal and where are they found in the periodic table?

• Non-metals are found towards the left and bottom of the periodic table. Non-metals gain electrons to form negative ions.

• Non-metals are found towards the top right of the periodic table. Non-metals gain electrons to form negative ions.

• Non-metals are found towards the left and top of the periodic table. Non-metals gain electrons to form negative ions.

• Non-metals are found towards the right and bottom of the periodic table. Non-metals lose electrons to form positive ions.

Answer explanation

What is an alloy?

• An alloy is a pure metal found in nature.

• An alloy is a compound formed from the reaction of a metal with oxygen.

• An alloy is a mixture containing a metal and another element (metal or non-metal).

• An alloy is a non-metallic substance formed from the combination of two or more non-metals.

Answer explanation

Why are alloys harder than pure metals?

• Alloys have a higher melting point than pure metals.

• Alloys contain more atoms than pure metals.

• Alloys contain different sized atoms, which distort the layers, preventing them from sliding and increasing the hardness of the material.

• Alloys have a more uniform atomic structure compared to pure metals.

Answer explanation

Atoms in pure metals are arranged in uniform rows which can easily slide over each other, making them very malleable. Alloys contain different sized atoms which distort these layers meaning the layers are unable to slide, increasing the hardness of the material.

What is brass? What is it used for?

• Brass is a pure metal found in nature, used for decorative purposes.

• Brass is a compound formed from the reaction of copper with zinc, used for electrical wiring.

• Brass is an alloy of copper and zinc, known for its hardness and resistance to corrosion. It is used for decorative hardware such as plumbing fittings.

• Brass is an alloy of iron and carbon, used for making tools and machinery.

Answer explanation

What are ions?

• Atoms or groups of atoms with a neutral charge.

• Atoms or groups of atoms with a positive charge only.

• Atoms or groups of atoms with a negative charge only.

• Atoms or groups of atoms with a positive or negative charge.

Answer explanation

How are ions formed?

• Positive ions form when an atom gains electrons, and negative ions form when an atom loses electrons.

• Positive ions form when an atom gains protons, and negative ions form when an atom loses protons.

• Positive ions form when an atom loses electrons, and negative ions form when an atom gains electrons.

• Positive ions form when an atom gains neutrons, and negative ions form when an atom loses neutrons.

Answer explanation