Q: What bonds form because they give atoms a more stable arrangement of electrons? Read this paragraph and choose the correct option from the provided answers: Covalent bonds form because they give atoms a more stable arrangement of electrons. Look at the hydrogen atoms in Figure above . Alone, each hydrogen atom has just one electron. By sharing electrons with another hydrogen atom, it has two electrons: its own and the one in the other hydrogen atom. The shared electrons are attracted to both hydrogen nuclei. This force of attraction holds the two atoms together as a molecule of hydrogen. Choices: - Hydrogen bond - Ionic bond - Polar bond - covalent A:
covalent

(Question)
Q: Any sample of matter that has the same physical and chemical properties throughout the sample is called what? Read this paragraph and choose the correct option from the provided answers: Elements and Compounds Any sample of matter that has the same physical and chemical properties throughout the sample is called a substance. There are two types of substances. A substance that cannot be broken down into chemically simpler components is an element. Aluminum, which is used in soda cans, is an element. A substance that can be broken down into chemically simpler components (because it has more than one element) is acompound (Figure 1.2 "The General Steps of the Scientific Method"). Water is a compound composed of the elements hydrogen and oxygen. Today, there are about 118 elements in the known universe. In contrast, scientists have identified tens of millions of different compounds to date. Choices: - element - molecule - type - substance A:
(Answer)
substance

Ques: Q: What process converts the sun's hydrogen nuclei into helium? Read this paragraph and choose the correct option from the provided answers: Figure 32.19 Nuclear fusion in the Sun converts hydrogen nuclei into helium; fusion occurs primarily at the boundary of the helium core, where temperature is highest and sufficient hydrogen remains. Energy released diffuses slowly to the surface, with the exception of neutrinos, which escape immediately. Energy production remains stable because of negative feedback effects. Choices: - solar fission - nuclear fission - combustion - nuclear fusion A:
Ans: nuclear fusion

(Q).
Q: Where does chemical digestion mainly occur? Read this paragraph and choose the correct option from the provided answers: Digestion consists of mechanical and chemical digestion. Mechanical digestion occurs in the mouth and stomach. Chemical digestion occurs mainly in the small intestine. The pancreas and liver secrete fluids that aid in digestion. Choices: - apendix - pancreas - liver - small intestine A:
(A).
small intestine

Ques:Q: What is caused by human actions that releases chemical substances and particles into the air? Read this paragraph and choose the correct option from the provided answers: Recall that air pollution is due to chemical substances and particles released into the air mainly by human actions. When most people think of air pollution, they think of the pollution outdoors. But it is just as easy to have indoor air pollution. Your home or school classroom probably doesn't get much fresh air. Sealing up your home reduces heating and cooling costs. But this also causes air pollution to stay trapped indoors. And people today usually spend a majority of their time indoors. So exposure to indoor air pollution can become a significant health risk. Choices: - CFO pollution - Improper Emissions - heavy pollution - air pollution A:

Ans:air pollution

Ques:Q: What is the upper-most atmosphere known as? Read this paragraph and choose the correct option from the provided answers: The atmosphere is a big part of the water cycle. What do you think would happen to Earth's water without it?. Choices: - xerosphere - exosphere - ionosphere - thermosphere A:

Ans:
thermosphere