Answer the following question given this paragraph: Nonmetals tend to gain electrons in chemical reactions and have a high attraction to electrons within a compound. The most reactive nonmetals reside in the upper right portion of the periodic table. Since the noble gases are an unusually unreactive group, the element fluorine is the most reactive nonmetal. It is also not found in nature as a free element. Fluorine gas reacts explosively with many other elements and compounds and is considered to be one of the most dangerous known substances. Q: What group of gases are unusually unreactive? Choices: - volcanic gases - greenhouse gases - halogens - noble gases A:
noble gases
(Question)
Answer the following question given this paragraph: Q: What is defined as anything that takes up space and has mass? Choices: - electrons - elements - atoms - matter A:
(Answer)
matter
Ques: Answer the following question given this paragraph: Invertebrates are animals that lack a vertebral column, or backbone. All the phyla in Table above , except the Phylum Chordata, consist only of invertebrates. Even the Phylum Chordata includes some invertebrate taxa. Invertebrates make up about 95 percent of all animal species. Q: Invertebrates make up what percentage of all animal species? Choices: - 90 percent - 50 percent - 30 percent - 95 percent A:
Ans: 95 percent
(Q).
Answer the following question given this paragraph: You can see an example of a negative feedback loop in Figure below . It shows how levels of thyroid hormones regulate the thyroid gland. This loop involves the hypothalamus and pituitary gland as well as the thyroid gland. Low levels of thyroid hormones in the blood cause the release of hormones by the hypothalamus and pituitary gland. These hormones stimulate the thyroid gland to secrete more hormones. The opposite happens with high levels of thyroid hormones in the blood. The hypothalamus and pituitary gland stop releasing hormones that stimulate the thyroid. Q: Low levels of thyroid hormones in the blood cause the release of what by the hypothalamus and pituitary gland? Choices: - acids - bases - enzymes - hormones A:
(A).
hormones
Ques:Answer the following question given this paragraph: A combination reaction makes a new substance from more than one reactant; a redox reaction rearranges electrons. Not all combination reactions are redox reactions, and not all redox reactions are combination reactions. Q: A redox reaction rearranges what subatomic particles? Choices: - neutrons - water molecules - protons - electrons A:

Ans:electrons
Answer the following question given this paragraph: The Sun was the first object to form in the solar system. Gravity pulled matter together to the center of the disk. Density and pressure increased tremendously. Nuclear fusion reactions begin. In these reactions, the nuclei of atoms come together to form new, heavier chemical elements. Fusion reactions release huge amounts of nuclear energy. From these reactions a star was born, the Sun. Q: What was the first object to form in the solar system? Choices: - earth - moon - jupiter - sun A:
sun