Answer the following question given this paragraph: Chemistry is based on the modern atomic theory, which states that all matter is composed of atoms. Q: What branch of science is based on the modern atomic theory, which states that all matter is composed of atoms? Choices: - physics - psychology - biology - chemistry A:
chemistry
(Question)
Answer the following question given this paragraph: Estimation, as used in measurement, is the process of referencing a physical quantity in terms of a calibration or reference point. All measurement devices have reference marks of some kind. Q: A reference point is used in measurement to make what? Choices: - deviation - focal point - regression - estimation A:
(Answer)
estimation
Ques: Answer the following question given this paragraph: Acidophiles are organisms that "love" acids. They live in very acidic environments, such as acid mine drainage. They are also found near vents of volcanoes. The most acidophilic archaeans can thrive at negative pH values. No other organisms can survive in such acidic conditions. Q: Organisms that "love" acids are known as what? Choices: - acidophobes - acidic - acid heads - acidophiles A:
Ans: acidophiles
(Q).
Answer the following question given this paragraph: Another simple machine that uses a wheel is the pulley. A pulley is a simple machine that consists of a rope and grooved wheel. The rope fits into the groove in the wheel, and pulling on the rope turns the wheel. Figure below shows two common uses of pulleys. Q: A pulley is a simple machine that consists of a grooved wheel and? Choices: - a battery - a wedge - a lever - a rope A:
(A).
a rope
Ques:Answer the following question given this paragraph: Alpha and beta decay occur when a nucleus has too many protons or an unstable ratio of protons to neutrons. When the nucleus emits a particle, it gains or loses one or two protons, so the atom becomes a different element. Gamma decay, in contrast, occurs when a nucleus is in an excited state and has too much energy to be stable. This often happens after alpha or beta decay has occurred. Because only energy is emitted during gamma decay, the number of protons remains the same. Therefore, an atom does not become a different element during this type of decay. Q: Alpha and beta decay occur when a nucleus has too many protons or an unstable ratio of what? Choices: - electrons to neutrons - atoms to neutrons - nucleus to neutrons - protons to neutrons A:

Ans:protons to neutrons
Ques:Answer the following question given this paragraph: It should be noted that just because a process is spontaneous does not mean that it occurs quickly. The rusting of iron is a spontaneous process that takes place over a long period of time. The combustion of gasoline in oxygen (also a spontaneous process) is extremely fast when provided with a spark, but gasoline can be stored in air for quite a while without spontaneously combusting. Thermodynamics predicts the direction in which a reaction will eventually proceed, but it does not tell us anything about the rate at which the reaction occurs. The rate of a reaction depends on many factors, including activation energy, temperature, concentration, and the presence or absence of a catalyst. Chemical kinetics focuses on the pathway between reactants and products, while thermodynamics considers only the difference between the initial and final states. Q: Thermodynamics do not give us any insight into what attribute of spontaneous processes? Choices: - acceleration - decrease - increase - rate A:

Ans:
rate