Chemistry of life-notes

Dropdown

Everything is made up of ​

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. The simplest form of matter is called a(n) ​

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.

Multiple Choice

Which of the following elements are not major parts of living organisms?

• Hydrogen

• Carbon

• Gold

• Nitrogen

• Oxygen

Dropdown

Protons are ​

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, Neutrons are ​

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, and electrons are ​

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.

Multiple Choice

Select the ion from the following choices:

• O

• N

• C

• Na+

Dropdown

When 2 or more elements combine together with chemical bonds it is called a(n) ​

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.

Multiple Choice

How many electrons do elements want in their outer shell?

• 6

• 7

• 8

• 10

Dropdown

Elements fill their outer shell by combining with other elements. When electrons are transferred to another element it forms a(n) ​

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bond. When electrons are shared with another element it forms a(n) ​ ​

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bond.

Multiple Choice

When a covalent molecule has a slightly positive and a slightly negative sides it is called a(n)

• nonpolar molecule
• ionic molecule
• polar molecule
• neutral molecule

Multiple Choice

Which part of a water molecule has a Positive Charge?

• The Hydrogen

• The Oxygen

• The Top

• The Bottom

Multiple Choice

Which part of a water molecule has a Negative Charge?

• The Hydrogen

• The Oxygen

• The Left

• The Right

Labelling

Label the water molecules.

Drag labels to their correct position on the image

Hydrogen Bond

Hydrogen

Oxygen

Dropdown

The property of water that describes how it's molecules like to stick to itself is called ​

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. When water sticks to other objects, like glass, it is called ​

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.

Dropdown

Water is known as the ​

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. Water has the ability to dissolve many ​

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. When solutes are dissolved completely in water it is called a(n) ​

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.

Dropdown

Pure water is ​

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. When more H+ exist in water it is a(n) ​

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. When more -OH exist in water it is a(n) ​

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.

Multiple Choice

How do buffers help maintain homeostasis in the body?

• Buffers help regulate body temperature
• Buffers are only found in the digestive system
• Buffers assist in muscle contraction
• Buffers resist changes in pH levels.