Answer the following question given this paragraph: The sugar glucose is a covalent compound. When sugar dissolves in water, it forms individual glucose molecules (C 6 H 12 O 6 ). You can see how this happens in the Figure below . Sugar is polar like water, so sugar molecules also have positive and negative ends. Forces of attraction between oppositely charged ends of water and sugar molecules pull individual sugar molecules away from the sugar crystal. Little by little, the sugar molecules are separated from the crystal and surrounded by water. You can watch this happening in the video at the following URL: http://www. youtube. com/watch?v=hydUVGUbyvU. Q: What is the chemical formula for a glucose molecule? Choices: - a5 h12 o6 - H2 C3 NA6 - d5 h12 o6 - c6 h12 o6 A:
c6 h12 o6
(Question)
Answer the following question given this paragraph: Some extrusive igneous rocks cool so rapidly that crystals do not develop at all. These form a glass, such as obsidian. Others, such as pumice, contain holes where gas bubbles were trapped in the lava. The holes make pumice so light that it actually floats in water. The most common extrusive igneous rock is basalt. It is the rock that makes up the ocean floor. Shown below are three types of extrusive igneous rocks ( Figure below ). Q: What helps pumice float in water? Choices: - high density - large mass - gravity - gas bubble holes A:
(Answer)
gas bubble holes
Ques: Answer the following question given this paragraph: Introduction Coral reefs are home to about 25% of all marine species. They are being threatened by climate change, oceanic acidification, and water pollution, all of which change the composition of the solution we know as seawater. Dissolved oxygen in seawater is critical for sea creatures, but as the oceans warm, oxygen becomes less soluble. As the concentration of carbon dioxide in the atmosphere increases, the concentration of carbon dioxide in the oceans increases, contributing to oceanic acidification. Coral reefs are particularly sensitive to the acidification of the ocean, since the exoskeletons of the coral polyps are soluble in acidic solutions. Humans contribute to the changing of seawater composition by allowing agricultural runoff and other forms of pollution to affect our oceans. Solutions are crucial to the processes that sustain life and to many other processes involving chemical reactions. In this chapter, we will consider the nature of solutions, and examine factors that determine whether a solution will form and what properties it may have. In addition, we will discuss colloidssystems that resemble solutions but consist of dispersions of particles somewhat larger than ordinary molecules or ions. Q: Dissolved oxygen in seawater is critical for sea creatures, but as the oceans warm, oxygen becomes less what? Choices: - insoluble - abundant - saturated - soluble A:
Ans: soluble
(Q).
Answer the following question given this paragraph: All plants are adapted to live on land. Or are they? All living plants today have terrestrial ancestors, but some plants now live in the water. They have had to evolve new adaptations for their watery habitat. Q: Where do all plants come from? Choices: - phylogenetic ancestors - distant ancestors - cetacean ancestors - terrestrial ancestors A:
(A).
terrestrial ancestors
Ques:Answer the following question given this paragraph: Matter can be classified on the basis of how light interacts with it. Matter may be transparent, translucent, or opaque. Each type of matter is illustrated in Figure below . Q: Matter can be classified on the basis of how what interacts with it? Choices: - air - gravity - water - light A:

Ans:light
Ques: Answer the following question given this paragraph: Two horrific contraptions on frictionless wheels are compressing a spring by compared to its uncompressed (equilibrium) length. Each of the vehicles is stationary and they are connected by a string. The string is cut! Find the speeds of the vehicles once they lose contact with the spring. Q: Transport of nutrients and regulation of body temperature through fluid flow are characteristics of which bodily system? Choices: - peripheral - gastrointestinal - reproductive - cardiovascular A:
Ans:
cardiovascular