Chemistry-basics

Chemistry

by Brady Cox

​proton-positively charged

​electron-negatively charged

​neutron-neutraly charged

​protons,neutrons,electrons

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Multiple Choice

An electron is

• positively charged

• neutral

• negatively charged

Multiple Choice

atomic number is

• the number of protons

• the number of electrons

• the number of neutrons

• the location of an atom on the periodic table

Multiple Choice

Conservation of mass means

• all the atoms present before a chemical reaction are not present after

• atoms present before chemical reactions are present after

• new substances and new elements are formed in a chemical reaction

Multiple Choice

An elements is

• a substance that cannot be split into simpler substances

• a substance that can be split into simpler substances

Multiple Choice

A molecule is

• a singular particle of a particular element

• another name for an element

• 2 or more atoms that are combined

Multiple Select

which of the statements on physical changes are correct

• A physical change cannot be reversed

• A physical change is a change in state

• A physical change is a change in form

• A physical change is where new substances are formed

Multiple Choice

Signs of a chemical change include;

• change of colour, change of temperature, precipitate (solid) formed, gas released.

• change of colour, reversing back to original form, precipitate (solid) formed, gas released.

Multiple Choice

In a chemical reaction, reactants contact each other, bonds between atoms in the reactants

are broken, and

• atoms rearrange and form new bonds to make the products.

• atoms remain the same and do not form new bonds to make the proudcts

Multiple Choice

The type of reaction that releases energy as heat is called

• endothermic

• exothermic

• respiration

• photosynthesis