Why should scientists control most possible variables in their experiments?

How is water removed from the solute in crystallization?

Objects we see can be placed into two categories: luminous objects and illuminated objects. Luminous objects are objects that create light and illuminated objects are objects that reflect light.

Which of the following is true of photosynthesis? A. Most reactions within this process are exothermic. B. Oxygen is a reactant. C. Carbon dioxide is a reactant. D. Water is a product.

What structures are found in clusters in the mouth and have nerve cells that gather information about whether food is sweet, salty, bitter or sour? A. tonsils B. saliva glands C. taste buds D. nostrils

During an endothermic chemical reaction, four moles of gaseous reactants are turned into two moles of gaseous products. a. Yes b. No c. Can't decide with information given.

Which of the following statements about transition metals is true? a. They are never found uncombined in nature. b. They include familiar metals such as gold, silver, copper, and nickel. c.

Elements can be separated from one another. Question 6 options: True False

One gram of lipid yields about 9kcal of energy. that is due to the high abundance of which chemical element?

Which of the following happens during a chemical change? Check all of the boxes that apply 0 One atom or more changes into atoms of another element. New substances with different properties are formed. O Solids, liquids, or gases may form.

The energy derived from the movement of H + ions down an electrochemical gradient from the intermembrane space into the matrix is used to drive the synthesis of ATP. How many H + ions must be moved into the matrix for the synthesis of 1 ATP?