Q: What do atoms make by rearranging their chemical bonds in a reactant? Read this paragraph and choose the correct option from the provided answers: When a chemical reaction occurs, the atoms in the reactants rearrange their chemical bonds to make products. The new arrangement of bonds does not have the same total energy as the bonds in the reactants. Therefore, when chemical reactions occur, there will always be an accompanying energy change. In some reactions, the energy of the products is lower than the energy of the reactants. Thus, in the course of the reaction, the substances lose energy to the surrounding environment. Such reactions are exothermic and can be represented by an energylevel diagram like the one in http://catalog. flatworldknowledge. com/bookhub/reader/2547 gob-ch07_s04_f01. In most cases, the energy is given off as heat (although a few reactions give off energy as light). Figure 7.3 Exothermic Reactions. Choices: - solutions - compounds - minerals - products A:
products

(Question)
Q: What do you call a pure substance that cannot be broken down into different types of substances? Read this paragraph and choose the correct option from the provided answers: An element is a pure substance that cannot be broken down into different types of substances. There are almost 120 known elements ( Figure below ), each with its own personality. The chemical and physical properties of one element differ from any other. Elements are arranged according to their properties in the Periodic Table . Choices: - molecule - sample - compound - element A:
(Answer)
element

Ques: Q: Which element has atomic number 87? Read this paragraph and choose the correct option from the provided answers: Francium has an atomic number of 87. Write the chemical equation for the alpha particle emission of 212Fr. What is the daughter isotope?. Choices: - iron - argon - barium - francium A:
Ans: francium

(Q).
Q: What type of traits are features that are passed from one generation to the next called? Read this paragraph and choose the correct option from the provided answers: The theory of evolution by natural selection means that the inherited traits of a population change over time. Inherited traits are features that are passed from one generation to the next. For example, your eye color is an inherited trait. You inherited your eye color from your parents. Inherited traits are different from acquired traits , or traits that organisms develop over a lifetime, such as strong muscles from working out ( Figure below ). Choices: - generational traits - genetic traits - familial traits - inherited traits A:
(A).
inherited traits

Ques:Q: What element is the most common element in the universe? Read this paragraph and choose the correct option from the provided answers: An element is a pure substance. It cannot be separated into any other substances. There are more than 90 different elements that occur in nature. Some are much more common than others. Hydrogen is the most common element in the universe. Oxygen is the most common element in Earth's crust. Figure below shows other examples of elements. Still others are described in the video below. Choices: - carbon - helium - nitrogen - hydrogen A:

Ans:hydrogen

Q: Planets are held by the force of gravity in elliptical orbits around what? Read this paragraph and choose the correct option from the provided answers: Planets are held by the force of gravity in elliptical orbits around the Sun. Choices: - earth - mars - jupitor - sun A:
sun