Atomic Theory (Obj 4-3a)

Front

In Dalton's Atomic Theory, all elements consist of __________ that cannot be divided.

Back

Atoms

Front

Who claimed that matter was made of small, hard particles called 'atomos'?

Back

Democritus

Front

Which Law states that a compound is always composed of the same elements in the same proportion?

Back

Law of definite proportions

Front

According to the law of definite proportions, if a sample of a compound contains 7.00g of sulfur and 3.50g of oxygen, how much oxygen is in a sample with 14.0g of sulfur?

Back

7.00g

Front

In water, there are 8.0g of oxygen for each 1.0g of hydrogen. In hydrogen peroxide, there are 16.0g of oxygen for each 1.0g of hydrogen. This is an example of the Law of ______.

Back

Multiple Proportions

Front

What is the definition of an atom?

Back

The smallest unit of an element that retains the properties of that element.

Front

What does the Law of Conservation of Mass state?

Back

Mass is neither created nor destroyed in a chemical reaction.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of only one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.

Front

What is the significance of the atomic number?

Back

The atomic number determines the identity of an element and is equal to the number of protons in the nucleus.

Front

What is a molecule?

Back

A group of two or more atoms bonded together.