QUIZ: Study Guide Atoms

Which of the following are correct about atoms?

• They are the building blocks of matter.

• They have mass.

• They make up molecules.

• They are smaller than red blood cells.

• They take up space.

Answer explanation

Atoms are indeed the building blocks of matter, possess mass, form molecules, are smaller than red blood cells, and occupy space. All these statements accurately describe the fundamental properties of atoms.

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Simple molecules have (a)   :

(b)   (c)  

• low melting and boiling points

• weak structure because of few bonds

• solids liquids and gases

• High melting and boiling points

• strong structure because of many bo

Answer explanation

Simple molecules have low melting and boiling points due to weak intermolecular forces and a few bonds, allowing them to exist as solids, liquids, or gases at room temperature.

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Check all that apply about extended structures:

• High melting and boiling point

• strong structure because of many bonds

• solids only

• indefinitely extended 3-D array of atoms

• low melting and boiling point

Answer explanation

Extended structures have high melting and boiling points due to strong bonds, are typically solids, and form an indefinitely extended 3-D array of atoms, making them stable and robust.

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You are building a table that needs to be able to hold heavy machinery. Should you use a substance made of simple small molecules or giant extended structure molecules? WHY?

Answer explanation

You should use giant extended structure molecules because they provide greater strength and stability, making them suitable for supporting heavy machinery, unlike simple small molecules which lack the necessary structural integrity.

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Select the element(s) from the pictures below.

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How many Elements are in Cl₃O?

• 1

• 2

• 3

• 4

Answer explanation

Cl₃O consists of two different elements: chlorine (Cl) and oxygen (O). Therefore, the correct answer is 2.

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How many atoms are in Na₂CO₃?

• 6

• 8

• 3

• 4

Answer explanation

Na₂CO₃ consists of 2 sodium (Na) atoms, 1 carbon (C) atom, and 3 oxygen (O) atoms. Adding these gives 2 + 1 + 3 = 6 atoms in total. Therefore, the correct answer is 6.

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Select the true statements about CO₂.

• It is a molecule.

• It is a compound.

• It is an atom.

• It is an element.

Answer explanation

CO2 is a molecule made up of two oxygen atoms and one carbon atom, making it a compound. It is not an atom or an element, as those terms refer to single units of matter.

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Select the model of H₂O

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• 
• 

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Elements and compounds are different because

• They are both made of atoms

• Elements contain one type of atom while compounds contain different types of atoms

• Elements have more than one atoms while compounds have only one atom

• Elements make up matter while compounds don't

Answer explanation

Elements are pure substances made of only one type of atom, while compounds consist of two or more different types of atoms chemically bonded together. This distinction is key in understanding the nature of matter.