What is an example of a fact?

Water boils at 100 degrees Celsius at standard atmospheric pressure.

Chocolate ice cream is the most popular flavor.

Studying hard leads to success.

Which of the following statements is an opinion?

Water freezes at 0 degrees Celsius.

Which of the following statements can be classified as a fact?

The Great Wall of China is over 13,000 miles long.

Reading is more enjoyable than watching TV.

Summer is the best season of the year.

What distinguishes an opinion from a fact in a statement?

An opinion reflects personal beliefs or feelings, while a fact is verifiable and objective.

An opinion can be proven true, while a fact cannot.

A fact is always subjective and based on personal preferences.

An opinion is a universally accepted truth.

Which of the following is a fact rather than an opinion?

Math is more difficult than science.

Summer is the most enjoyable season.

Which statement is a fact?

Mount Everest is the highest mountain in the world.

Reading books is more enjoyable than playing video games.

Ice cream is the best treat on a hot day.

Which of the following statements is an example of an opinion?

Exercise is the best way to stay healthy.

Water is composed of two hydrogen atoms and one oxygen atom.

The speed of light is approximately 299,792 kilometers per second.

Which of the following is a fact?

The Pacific Ocean is the largest ocean on Earth.

Reading is more enjoyable than watching movies.

Chocolate cake is the best dessert.

Dogs are better companions than cats.

How can you identify a fact in a written text?

A fact can usually be verified through evidence or reliable sources.

A fact is often bolded or highlighted in the text.

A fact is based solely on the author's perspective.

A fact is always an emotional statement.

Which statement best describes an opinion?

An opinion is a belief or judgment that cannot be proven true or false.

An opinion can always be backed by scientific data.

An opinion is the same as a fact.

An opinion can be universally accepted by everyone.

What is a key characteristic of a fact?

A fact can be verified with evidence or research.

A fact is often debated among people.

A fact changes based on personal beliefs.

A fact is usually more interesting than an opinion.

What distinguishes a fact from an opinion in a text?

A fact is a statement that can be proven true or false, while an opinion expresses a personal belief or judgment.

A fact is always a negative statement, while an opinion is always positive.

A fact shows authorship, whereas an opinion does not relate to authorship.

A fact is a subjective statement, whereas an opinion is an objective statement.

Which of the following statements is an example of an opinion?

I believe that rain makes the world more beautiful.

The Earth revolves around the Sun.

Water boils at 100 degrees Celsius.

Differentiate between fact and opinion in text.

Learning Objectives 1. Differentiate between claims of fact, policy and value 2. Formulate claims of fact, policy and value

Many of water’s biological functions stem from its chemical struc- ture. Recall that in the water molecule, H2O, the hydrogen and oxygen atoms share electrons to form covalent bonds. However, these atoms do not share the electrons equally. The oxygen atom has a greater ability to attract electrons to it because it pulls hydrogen’s electrons towards its nucleus. As a result, as shown in Figure 2-8, the region of the molecule where the oxygen atom is located has a partial negative charge, denoted with a , while the regions of the molecule where each of the two hydrogen atoms are located have partial positive charges, each of which are denoted with a . Thus, even though the total charge on a water molecule is neutral, the charge is unevenly distributed across the water molecule. Because of this uneven distribution of charge, water is called a polar compound. Notice also in Figure 2-8 that the three atoms in a water mole- cule are not arranged in a straight line as you might expect. Rather, the two hydrogen atoms bond with the single oxygen atom at an angle. SECTION 3 OBJECTIVES ● Describe the structure of a water molecule. ● Explain how water’s polar nature affects its ability to dissolve substances. ● Outline the relationship between hydrogen bonding and the different properties of water. ● Identify the roles of solutes and solvents in solutions. ● Differentiate between acids and bases. VOCABULARY polar hydrogen bond cohesion adhesion capillarity solution solute solvent concentration saturated solution aqueous solution hydroxide ion hydronium ion acid base pH scale buffer Copyright © by Holt, Rinehart and Winston. All rights reserved. (a) Electron cloud model (b) Space-filling model H H O The oxygen region of the water molecule is weakly negative, and the hydrogen regions are weakly positive. Notice the different ways to represent water, H2O. You are familiar with the electron cloud model (a). The space- filling model (b) shows the three- dimensional structure of a molecule. FIGURE 2-8 40 CHAPTER 2 Hydrogen bond H H H H H H H H H O O O O O O H H H H H – – – – – – – + + + + + + + + + + + + + + The dotted lines in this figure represent hydrogen bonds. A hydrogen bond is a force of attraction between a hydrogen atom in one molecule and a negatively charged region or atom in a second molecule. FIGURE 2-10 The positive region of a water molecule attracts the negative region of an ionic compound, such as the Cl portion of NaCl. Similarly, the negative region of the water molecule attracts the positive region of the compound—the Na portion of NaCl. As a result, NaCl breaks apart, or dissolves, in water. FIGURE 2-9 CI– Na+ H2O + + – – Solubility of Water The polar nature of water allows it to dissolve polar substances, such as sugars, ionic compounds, and some proteins. Water does not dissolve nonpolar substances, such as oil because a weaker attraction exists between polar and nonpolar molecules than between two polar molecules. Figure 2-9 shows how water dissolves the ionic compound sodium chloride, NaCl. In your body, ions, such as sodium and chloride, are essential to bodily func- tions, such as muscle contraction and transmission of impulses in the nervous system. In fact, dissolved, or dissociated ions, are pre- sent in all of the aqueous solutions found in living things and are important in maintaining normal body functions. HYDROGEN BONDING The polar nature of water also causes water molecules to be attracted to one another. As is shown in Figure 2-10, the positively charged region of one water molecule is attracted to the negatively charged region of another water molecule. This attraction is called a hydrogen bond. A hydrogen bond is the force of attraction between a hydrogen molecule with a partial positive charge and another atom or molecule with a partial or full negative charge. Hydrogen bonds in water exert an attractive force strong enough so that water “clings” to itself and some other substances. Hydrogen bonds form, break, and reform with great frequency. However, at any one time, a great number of water molecules are bonded together. The number of hydrogen bonds that exist depends on the state that water is in. If water is in its solid state all its water molecules are hydrogen bonded and do not break. As water liquifies, more hydrogen bonds are broken than are formed, until an equal number of bonds are formed and broken. Hydrogen bonding accounts for the unique properties of water, some of which we will examine further. These properties include cohesion and adhesion, the ability of water to absorb a relatively large amount of energy as heat, the ability of water to cool surfaces through evaporation, the density of ice, and the ability of water to dissolve many substances.

Differentiate between heat and temperature at the molecular level;

Differentiate between the sequential logic design and the combinational logic design

Differentiate between communicable and chronic diseases. Communicable diseases are spread by pathogens (bacteria, viruses, fungi, and parasites). They may be spread through the air (Hantavirus, tuberculosis), food (salmonella, Ecoli), or water (SARS, polio). Some diseases are spread by insects. The bite of a tick may result in Lyme disease or Rocky Mountain Spotted Fever; mosquitoes spread malaria. The bite of a warm-blooded animal can cause rabies. Some communicable diseases are spread directly from person to person, such as the childhood illnesses: measles, mumps, and chicken pox. Sexually transmitted diseases are passed only through intimate contact. The most common STDs are caused by bacteria (Chlamydia, gonorrhea, syphilis) and viruses (herpes, HIV, human papilloma virus). Methods of preventing communicable diseases include avoiding pathogens, cleanliness, the use of barriers and prophylactics, abstinence from risky behaviors, and staying away from those infected. Chronic diseases involve the degeneration of body organs.

Differentiate between the cause and consequences for loss related to biodiversity

Differentiate between conduct and ethics

Differentiate between natural, whole, integer, irrational numbers

Related quizzes

Related quizzes