Q: In chemical reactions, what substances can act like metals or nonmetals, depending on their number of electrons? Read this paragraph and choose the correct option from the provided answers: How metalloids behave in chemical interactions with other elements depends mainly on the number of electrons in the outer energy level of their atoms. Metalloids may act either like metals or nonmetals in chemical reactions. Choices: - diacritics - minerals - synthetics - metalloids A:
metalloids

(Question)
Q: When zinc metal is mixed with sulfur and heated, what is produced? Read this paragraph and choose the correct option from the provided answers: In the course of a chemical reaction between a metal and a nonmetal, electrons are transferred from the metal atoms to the nonmetal atoms. For example, when zinc metal is mixed with sulfur and heated, the compound zinc sulfide is produced. Two valence electrons from each zinc atom are transferred to each sulfur atom. Choices: - extraction sulfide - methane sulfide - iron - zinc sulfide A:
(Answer)
zinc sulfide

Ques: Q: A mutation is a random change in an organism's what? Read this paragraph and choose the correct option from the provided answers: At some point, the variation probably came from a mutation. A mutation is a random change in an organism's genes. Mutations are natural. Some are harmful, but many are neutral. If the trait from the mutation is beneficial, that organism may have a better chance to survive. An organism that survives is likely to have offspring. If it does, it may pass the mutation on to its offspring. The offspring may be more likely to survive. Choices: - power - structure - babies - genes A:
Ans: genes

(Q).
Q: The duodenum is a part of which part of the gi tract? Read this paragraph and choose the correct option from the provided answers: The duodenum is the first and shortest part of the small intestine. Most chemical digestion takes place here, and many digestive enzymes are active in the duodenum (see Table below ). Some are produced by the duodenum itself. Others are produced by the pancreas and secreted into the duodenum. Choices: - large intense - pharynx - ulna - small intestine A:
(A).
small intestine

Ques:Q: Burning of methane is a type of what, which involves the breaking and forming of bonds? Read this paragraph and choose the correct option from the provided answers: An example of a chemical reaction is the burning of methane. In this chemical reaction, the reactants are methane (CH 4 ) and oxygen (O 2 ), and the products are carbon dioxide (CO 2 ) and water (H 2 O). A chemical reaction involves the breaking and forming of chemical bonds. When methane burns, bonds break in the methane and oxygen molecules, and new bonds form in the molecules of carbon dioxide and water. Choices: - liquid reaction - physical reaction - toxic reaction - chemical reaction A:

Ans:chemical reaction

Q: What is the term for an underground layer of rock that is saturated with groundwater? Read this paragraph and choose the correct option from the provided answers: An underground layer of rock that is saturated with groundwater is called an aquifer . A diagram of an aquifer is shown in Figure below . Aquifers are generally found in porous rock, such as sandstone. Water infiltrates the aquifer from the surface. The water that enters the aquifer is called recharge. Choices: - delta - river - bason - aquifer A:
aquifer