15 Questions
What is the difference between a mixture and a pure substance?
A mixture is made up of two or more substances that are physically combined, while a pure substance is made up of only one type of substance.
What is a physical change?
A change in which the physical properties of a substance are altered.
What is a chemical change?
A change in which the chemical composition of a substance is altered.
What is meant by reactants and products?
Reactants are the substances that are used up during a chemical reaction, while products are the substances that are formed.
What happens to the mass of reactants and products during a reaction?
The mass of reactants and products remain the same.
What is the difference between a mixture and a pure substance?
A mixture is a combination of two or more substances that are not chemically combined, while a pure substance is made up of only one type of atom or molecule
What is the Law of Conservation of Mass?
The mass of reactants equals the mass of products in a chemical reaction
What are the physical properties of alkali metals?
Softness and reactivity with water
How can one predict the state of a substance at a given temperature?
By using its melting and boiling points
What is chromatography used for?
To separate an insoluble solid from a liquid
What is the difference between a mixture and a pure substance?
A mixture is a combination of two or more substances that are not chemically combined, while a pure substance is made up of only one type of atom or molecule.
What physical properties can vary greatly between metal and non-metal elements?
Melting and boiling points, electrical and thermal conductivity, state, shininess, malleability, ductility, and brittleness.
How are simple compounds formed from two elements identified?
They can be identified by their -ide and -ate suffixes.
What is the Law of Conservation of Mass?
The mass of reactants equals the mass of products in a chemical reaction.
How can you predict the state of a substance at a given temperature?
By using its melting and boiling points.
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