Answer the following question given this paragraph: There are several different ways to quantitatively describe the concentration of a solution. For example, molarity was introduced in as a useful way to describe solution concentrations for reactions that are carried out in solution. Mole fractions, introduced in , are used not only to describe gas concentrations but also to determine the vapor pressures of mixtures of similar liquids. Example 4 reviews the methods for calculating the molarity and mole fraction of a solution when the masses of its components are known. Q: What is used to describe gas concentrations of a solution? Choices: - fixation fractions - mesh fractions - atom fractions - mole fractions A:
mole fractions
(Question)
Answer the following question given this paragraph: The core is the Sun's innermost layer. The core is plasma. It has a temperature of around 15 million degrees Celsius (C). Nuclear fusion reactions create the immense temperature. In these reactions, hydrogen atoms fuse to form helium. This releases vast amounts of energy. The energy moves toward the outer layers of the Sun. Energy from the Sun's core powers most of the solar system. Q: The innermost layer of the sun is known as what? Choices: - photosphere - surface - convective zone - core A:
(Answer)
core
Ques: Answer the following question given this paragraph: The speed of most waves depends on the medium through which they are traveling. Generally, waves travel fastest through solids and slowest through gases. That's because particles are closest together in solids and farthest apart in gases. When particles are farther apart, it takes longer for the energy of the disturbance to pass from particle to particle. Q: Do waves move faster when particles are close to each other or far away? Choices: - unaffected - far away - open - close A:
Ans: close
(Q).
Answer the following question given this paragraph: Your heart pumps blood around your body. But how does your heart get blood to and from every cell in your body? Your heart is connected to blood vessels such as veins and arteries. Organs that work together form an organ system . Together, your heart, blood, and blood vessels form your cardiovascular system . Q: What organ system is comprised of your heart, blood, and blood vessels all working together? Choices: - thoraxic system - nervous system - digestive system - cardiovascular system A:
(A).
cardiovascular system
Ques:Answer the following question given this paragraph: From seeing a skeleton, you might think that bones are just dead, hollow structures. But in a living person, those hollow spaces are full of living cells. Bones have a blood supply and nerves. Bones are a living tissue. Q: Are bones considered living or dead tissues? Choices: - decaying - decomposing - dead - living A:

Ans:living
Answer the following question given this paragraph: When the temperature of reactants is higher, the rate of the reaction is faster. At higher temperatures, particles of reactants have more energy, so they move faster. They are more likely to bump into one another and to collide with greater force. For example, when you fry an egg, turning up the heat causes the egg to cook faster. The same principle explains why storing food in a cold refrigerator reduces the rate at which food spoils (see Figure below ). Both food frying and food spoiling are chemical reactions that happen faster at higher temperatures. Q: Which temperatures cause particles of reactants to have more energy? Choices: - non-existant - reducing - lower - higher A:
higher