Answer the following question given this paragraph: Halkieria, or scale worms, are an example of a fossil life from the Cambrian. Q: What is another term for scale worms? Choices: - trichina - wormidanopis - spirogyra - halkieria A:
halkieria
(Question)
Answer the following question given this paragraph: A machine is any device that makes work easier by changing a force. Work is done whenever a force moves an object over a distance. The amount of work done is represented by the equation:. Q: What do you call any device that makes work easier by changing a force? Choices: - technology - invention - battery - machine A:
(Answer)
machine
Ques: Answer the following question given this paragraph: Smog clouds the city of Los Angeles, California. Visible air pollution in the form of smog is a sign that the air is unhealthy. Q: Smog is a visible form of what? Choices: - condensation - water pollution - oxidation - air pollution A:
Ans: air pollution
(Q).
Answer the following question given this paragraph: The formula unit of sodium chloride dissociates into one sodium ion and one chloride ion. The calcium nitrate formula unit dissociates into one calcium ion and two nitrate ions. This is because of the 2+ charge of the calcium ion. Two nitrate ions, each with a 1 charge are required to make the equation balance electrically. The ammonium phosphate formula unit dissociates into three ammonium ions and one phosphate ion. Note that the polyatomic ions themselves do not dissociate further, but remain intact. Q: The formula unit of sodium chloride dissociates into one sodium ion and one? Choices: - oxygen ion - magnesium ion - electron - chloride ion A:
(A).
chloride ion
Ques:Answer the following question given this paragraph: Molecular and Formula Masses The molecular mass of a substance is the sum of the average masses of the atoms in one molecule of a substance. It is calculated by adding together the atomic masses of the elements in the substance, each multiplied by its subscript (written or implied) in the molecular formula. Because the units of atomic mass are atomic mass units, the units of molecular mass are also atomic mass units. The procedure for calculating molecular masses is illustrated in Example 1. Q: What is calculated by adding together the atomic masses of the elements in the substance, each multiplied by its subscript (written or implied) in the molecular formula? Choices: - mass effect - fractional mass - magnetic mass - molecular mass A:

Ans:molecular mass
Ques: Answer the following question given this paragraph: The study of the Universe is called cosmology . Cosmologists study the structure and changes in the present Universe. The Universe contains all of the star systems, galaxies, gas, and dust, plus all the matter and energy that exists now. Plus all that existed in the past, and all that will exist in the future. The Universe includes all of space and time. Q: What branch of science is the study of the universe, not of cosmetics? Choices: - theology - astronomy - epistemology - cosmology A:
Ans:
cosmology