Elements and Compounds in Chemistry

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What is the smallest part of an element that can exist?

An atom

What is the difference between physical and chemical properties of elements?

Physical properties include state, appearance, smell, and magnetic properties, while chemical properties include what an element reacts with and how reactive it is.

How are compounds formed from elements?

By chemical reactions

What is the key characteristic of a compound?

It contains two or more elements chemically joined together in fixed proportions Signup and view all the answers

How can compounds be separated into elements?

By chemical reactions Signup and view all the answers

What is a molecule, and how does it relate to elements and compounds?

A molecule is two or more non-metal atoms chemically joined together, and it can be either an element or a compound. Signup and view all the answers

What is the general rule for naming compounds, especially when a metal and a non-metal react?

The metal goes first, and the non-metal goes second, with its name ending in '-ide' Signup and view all the answers

What is the typical number of elements in a compound with a name ending in –ate?

three Signup and view all the answers

How are the elements organized in the Periodic Table?

into periods and groups Signup and view all the answers

What is the characteristic of elements in the same group of the Periodic Table?

similar chemical properties Signup and view all the answers

Where are metals typically located in the Periodic Table?

left hand side of the ‘staircase’ Signup and view all the answers

What does a chemical symbol represent?

an element Signup and view all the answers

What information does a chemical formula provide?

which elements and how many atoms of each are in one molecule Signup and view all the answers

What is the purpose of a subscript number in a chemical formula?

to indicate the number of atoms of an element Signup and view all the answers

What is the composition of one molecule of HNO3?

1 atom of hydrogen, 1 atom of nitrogen, and 3 atoms of oxygen Signup and view all the answers

What is the key difference between an element and a compound?

An element is composed of only one type of atom, while a compound is formed from two or more elements chemically joined together in fixed proportions. Signup and view all the answers

What are the two main categories of properties that elements can exhibit?

Physical properties (e.g. state, appearance, smell, magnetic) and chemical properties (e.g. what it reacts with and how reactive it is). Signup and view all the answers

What happens to elements when they undergo a chemical reaction to form a compound?

The elements are chemically joined together in fixed proportions to form a new substance with different properties. Signup and view all the answers

What is the significance of the term 'molecule' in chemistry?

A molecule is two or more non-metal atoms chemically joined together, which can be an element (e.g. H2) or a compound (e.g. H2O). Signup and view all the answers

Why do compounds have different properties from the elements they are composed of?

Because the elements are chemically joined together in fixed proportions, resulting in a new substance with distinct properties. Signup and view all the answers

What is the purpose of following rules when naming compounds?

To ensure clear and consistent communication of the compound's composition and properties. Signup and view all the answers

How can a compound be separated into its constituent elements?

Only through chemical reactions. Signup and view all the answers

What determines the number of atoms of an element in a molecule, according to a chemical formula?

The small subscript number after an element symbol. Signup and view all the answers

In what direction are groups organised in the Periodic Table?

Vertically. Signup and view all the answers

What is the typical location of non-metals in the Periodic Table?

Right hand side of the 'staircase'. Signup and view all the answers

What information does the chemical formula of a molecule or compound provide?

Which elements and how many atoms of each are in one molecule. Signup and view all the answers

What is the purpose of a chemical symbol?

To represent an element. Signup and view all the answers

How are the periods in the Periodic Table organised?

Horizontally. Signup and view all the answers

What is the characteristic of elements in the same period?

They have similar chemical properties. Signup and view all the answers

What is the composition of a compound with a name ending in –ate?

Three elements, including a non-metal and oxygen. Signup and view all the answers