chapter 2, basic chem Flashcards

1
Q

What is matter?

A

Anything that has mass and takes up space.

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2
Q

Define an element.

A

A pure substance consisting of only one type of atom (e.g., oxygen, carbon).

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3
Q

What is an atom?

A

The smallest unit of an element that retains its properties.

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4
Q

What is a proton?

A

Positively charged subatomic particle, found in the nucleus.

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5
Q

What is a neutron?

A

Neutral subatomic particle, found in the nucleus.

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6
Q

What is an electron?

A

Negatively charged subatomic particle, orbits the nucleus.

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7
Q

What defines an ionic bond?

A

Transfer of electrons from one atom to another, creating charged ions (e.g., NaCl).

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8
Q

Define a covalent bond.

A

Sharing of electrons between atoms (e.g., H₂O).

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9
Q

What is a nonpolar covalent bond?

A

Equal sharing of electrons (e.g., O₂).

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10
Q

What characterizes a polar covalent bond?

A

Unequal sharing of electrons, creating partial charges (e.g., H₂O).

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11
Q

What is a hydrogen bond?

A

Weak attraction between a hydrogen atom and another electronegative atom (e.g., in water molecules, DNA structure).

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12
Q

What are Van der Waals forces?

A

Weak, temporary interactions between molecules.

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13
Q

What is cohesion in relation to water?

A

Water molecules stick together due to hydrogen bonding.

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14
Q

Define adhesion.

A

Water molecules stick to other surfaces.

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15
Q

What is surface tension?

A

The cohesive forces at the surface of water.

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16
Q

What is a solvent?

A

A substance that dissolves other substances (e.g., water is the universal solvent).

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17
Q

What does hydrophilic mean?

A

Water-loving substances (dissolve in water, e.g., salt, sugar).

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18
Q

What does hydrophobic mean?

A

Water-fearing substances (do not dissolve in water, e.g., fats, oils).

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19
Q

What does the pH scale measure?

A

Hydrogen ion concentration (0-14).

20
Q

What is an acid?

A

pH below 7; high H⁺ concentration (e.g., stomach acid).

21
Q

Define a base (alkaline).

A

pH above 7; low H⁺ concentration (e.g., ammonia).

22
Q

What is a neutral pH?

A

pH of 7 (e.g., pure water).

23
Q

What is a buffer?

A

A substance that resists changes in pH (e.g., bicarbonate in blood).

24
Q

What are carbohydrates?

A

Provide energy; made of monosaccharides (e.g., glucose).

25
Q

Define monosaccharide.

A

Simple sugar (e.g., glucose, fructose).

26
Q

What is a disaccharide?

A

Two monosaccharides (e.g., sucrose, lactose).

27
Q

What is a polysaccharide?

A

Many monosaccharides (e.g., starch, glycogen, cellulose).

28
Q

What are lipids?

A

Store energy, make up cell membranes, and provide insulation.

29
Q

What are fatty acids?

A

Building blocks of lipids.

30
Q

What are triglycerides?

A

Glycerol + 3 fatty acids (e.g., fats, oils).

31
Q

What are phospholipids?

A

Make up cell membranes (hydrophilic head, hydrophobic tail).

32
Q

What are steroids?

A

Lipids with a four-ring structure (e.g., cholesterol, hormones).

33
Q

What are proteins?

A

Perform cellular functions; made of amino acids.

34
Q

Define amino acids.

A

Building blocks of proteins.

35
Q

What is a peptide bond?

A

Bond between amino acids.

36
Q

What are enzymes?

A

Proteins that speed up chemical reactions.

37
Q

What is denaturation?

A

Loss of protein shape due to heat or pH change.

38
Q

What are nucleic acids?

A

Store genetic information (DNA & RNA).

39
Q

What is DNA?

A

Stores genetic instructions.

40
Q

What is RNA?

A

Helps make proteins.

41
Q

Define nucleotide.

A

Building block of nucleic acids (sugar, phosphate, base).

42
Q

What is ATP?

A

The main energy carrier in cells.

43
Q

What is metabolism?

A

All chemical reactions in the body.

44
Q

Define anabolism.

A

Building up molecules (e.g., protein synthesis).

45
Q

What is catabolism?

A

Breaking down molecules (e.g., digestion).