Answer the following question given this paragraph: Chemical reactions either require energy or release energy. The amount of energy needed or released depends upon the structure of the molecules that are involved in the reaction. Some reactions need to be heated for long periods of time in order for change to take place. Other reactions release energy, allowing heat to be given off to the surroundings. Q: Chemical reactions either require or release what? Choices: - light - electricity - enzymes - energy A:
energy
(Question)
Answer the following question given this paragraph: Cutting and burning trees to clear land for farming is called slash-and-burn agriculture. How does this affect the atmosphere?. Q: What is the cutting and burning trees to clear land for farming called? Choices: - drop-and-blaze agriculture - cut-and-smoke farming - reduce-and-ignite agriculture - slash-and-burn agriculture A:
(Answer)
slash-and-burn agriculture
Ques: Answer the following question given this paragraph: In 1869, a Russian scientist named Dmitri Mendeleev created the periodic table , which is a way of organizing elements according to their unique characteristics, like atomic number, density, boiling point, and other values ( Figure below ). Each element is represented by a one or two letter symbol. For example, H stands for hydrogen, and Au stands for gold. The vertical columns in the periodic table are known as groups, and elements in groups tend to have very similar properties. The table is also divided into rows, known as periods. Q: Who created the periodic table? Choices: - Isaac Newton - Gregor Mendel - Niels Bohr - dmitri mendeleev A:
Ans: dmitri mendeleev
(Q).
Answer the following question given this paragraph: Investigation is at the heart of science. It is how scientists do research. Scientific investigations produce evidence that helps answer questions and solve problems. If the evidence cannot provide answers or solutions, it may still be useful. It may lead to new questions or problems for investigation. As more knowledge is discovered, science advances. Q: In science, what process produces evidence that helps answer questions and solve problems? Choices: - information - manipulation - suspension - investigation A:
(A).
investigation
Ques:Answer the following question given this paragraph: enzymes - proteins which speed up chemical reactions. Q: Enzymes - proteins which speed up what? Choices: - crystals reactions - liquid reactions - physical reactions - chemical reactions A:

Ans:chemical reactions
Ques:Answer the following question given this paragraph: An element is a pure substance that cannot be separated into any other substances. There are 92 naturally occurring elements. Q: What is a pure substance that cannot be separated into any other substances called? Choices: - light - Cells - Spears - element A:

Ans:
element