Answer:
In an experiment in which blood pressure medication is tested, one group is given the blood pressure medication while the control group is given a placebo pill.
In a test of anxiety treatment, one group attends individual therapy sessions and receives a new medication. The control group receives only an inert pill.
A treatment for drug addiction is being tested. A group of meth addicts are given the treatment while the control group is given the placebo.
Researchers are testing the effectiveness of a drug intended to reduce symptoms of Crohn's disease. Many sufferers of Crohn's disease are recruited for the effort and the group that receives the placebo is the control group.
A treatment for hair loss in men is being tested. Men of the same age range are gathered. One group receives an application with the active ingredient while the control group receives an application that appears the same but does not have the active ingredient in it.
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Answer: (c) a gold brick would have the least amount of inertia.
The inertia of an object refers to its ability to continue in its present state of rest or uniform motion until any external force act of the body to change its state of motion.
The inertia of a body increases with its mass. For this reason, a body with more mass and high inertia needs larger force to change its state of motion or rest. Among the given objects, the mass of a gold brick is the least. For this reason, it would have the least amount of inertia and least amount of force is required to change its state of motion or rest.
In the case of melting, added energy is used to break the bonds between the molecules. ... They are changes in bonding energy between the molecules. If heat is coming into a substance during a phase change, then this energy is used to break the bonds between the molecules of the substance.
Answer:
CaCl₂.6H₂O
Explanation:
- If we suppose that the compound has a mass of 100.0 g, it will contain 18.29 grams of Ca, 32.37 grams of Cl, and 49.34 grams of water.
- We can convert the grams of each element to moles by dividing the number of grams by the atomic mass of each element.
No. of moles of Ca = (18.29 g) / (40.0 g/mol) = 0.457 mol.
No. of moles of Cl = (32.37 g) / (35.4 g/mol) = 0.914 mol.
No. of moles of H₂O = (49.34 g) / (18.0 g/mol) = 2.74 mol.
- The no. of moles of (Ca: Cl: H₂O) is (0.457 mol: 0.914 mol: 2.74 mol).
- To obtain the ratio of the elements in the compound, we divide over the lowest no. of moles (0.475).
So the mole ratio of (Ca: Cl: H₂O) is (1: 2: 6).
So, the formula of the compound is CaCl₂.6H₂O.
A buffer has roughly equal concentrations of a weak acid and its conjugate base. The only acids in the question are HNO3 and HNO2. HNO3 is a strong acid, so it can’t be used for a buffer. The first option has HNO2 and hydrochloric acid, which won’t supply the conjugate base of HNO2, which is NO2^-1. NaCl isn’t an acid or a base, so we can eliminate that as well. That leaves us with HNO2 and NaNO2. Group 1 metals are spectators in acid-base equilibria, so we can ignore Na once it disassociates. That will give us .1M HNO2 and .1M NO2^-1, which is what we want.
