Looks like no one added any tags here yet for you.
Litmus paper changes
________ colour depending on whether something is an acid or alkali.
Combustion
________ is good as it gives off energy in the form of light and heat.
Hydrogen
A Hydrocarbon is just ________ and Carbon together (CH4)
Oxidation
________ is when a substance reacts and combines with oxygen.
mass
No ________ is lost or gained in a chemical reaction as no particles are added or removed.
Atoms
________ are not created nor destroyed in a chemical reaction and all the ________ in the reactants are in the products, however, they are rearranged.
sodium
There are many different types of salts, such as ________ chloride (table salt), copper sulfate, ________ nitrate and more.
Acids
________ can burn through the skin.
Handwarmers
________ are exothermic.
Rainwater
________ is acidic due to pollution, and acid rain, which is just extremely polluted rain, has more acid.
Thermal Decomposition
________ is the breaking down of a singular substance into two or more different substances.
Visible changes
________ also occur in a chemical reaction.
Chemical reactions
________ are always balanced, however, you need to figure out how to balance them on paper.
Exothermic reaction
In a(n) ________, heat energy is given out.
Warm colours
________ are acids and cool colours are alkalis.
Catalysts
________ increase the speed of a chemical reaction and they are not changed nor used up themselves and are reusable.
universal indicator
The ________ shows whether something is an acid or alkali and also shows the pH number which indicates how strong it is.
symbol equation
A(n) ________ shows the chemical symbols and how many of each molecule or atom there is.
combustion
There are three things necessary for ________, which is burning using oxygen.
Oxidation
________ is another form of a chemical reaction.
Catalysts
________ help industries as they increase the speed of the reaction, lower the temperature needed, make reactions cheaper and they increase the number of products made in a given amount of time, however, they are expensive to buy and different reactions need different catalysts, and they can be poisoned and required to be cleaned.
Chemical reactions
________ do involve a change in energy, such as taking in or giving out different energies, such as heat, light or sound.
exothermic reactions
In addition, condensing and freezing are ________, as they are giving out their energy to be able to cool and then condense /freeze.
Catalysts
________ also decrease the minimum amount of energy required to start a reaction and lower the temperature needed to start the reaction.