The answer for this question is A. red hair
Controlled variables are variables that an experimenter keeps constant to prevent confounding with the independent variable. The are called this because the experimenter controls them. For example, suppose you want to compare the effectiveness of hypnosis and relaxation as treatments for stress.
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Answer:
C. percent saturation of hemoglobin with O2 in systemic arterial blood
Explanation:
Hemoglobin is a protein that contains 4 heme groups that have iron (Fe) as its central atom, which is the binding site for the oxygen molecule (the oxygen binds with the iron atom), so each hemoglobin molecule can bind up to 4 oxygen molecules. This oxygenated blood is the arterial blood, which becomes bright red because of this binding, and is the blood that carries that oxygen to all the tissues.
Sometimes, conditions like temperature, pH, or CO2 concentration can affect the structure of the hemoglobin, and that can make it more difficult for oxygen to bind to heme group, so in those cases that would have a direct effect on the percentage of saturated hemoglobin (hemoglobin binded with oxygen).
Answer:
3 Litres.
Explanation:
The balance equation of reaction is written in equation (1) below;
4H2 (g) + CS2(g) -------------> CH4 (g) + 2H2S (g) ------------------------------(1).
(From the balanced equation above) one mole of methane, CH4 and two moles of Hydrogen Sulphide, H2S are being produced when one mole of carbon Sulphide, CS2 reacts with 4 moles of Hydrogen gas.
(Parameters given from the question): we have 36 litres of Hydrogen, H2 gas and 12 litres of carbon Sulphide, CS2 gas.
Therefore, 36 Litres of H2 would react completely with; 36 litres/ 4.
= 9 Litres of Carbon Sulphide.
LIMITING REAGENT: (The reagent that is totally consumed). Hydrogen gas, H2 is the limiting reactant since we have 12 litres of Carbon Sulphide, CS2.
EXCESS REAGENT: Carbon Sulphide.
Amount remaining= 12 Litres of CS2 - 9 litres that was reacted.
= 3 Litres.
Explanation:
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