During the test trial, the sugar pill given to the control group is called a placebo. Therefore, the correct option is A. Placebo
A placebo is any drug or a treatment with no active substances, for example a sugar pill.
During clinical trials, usually one group takes the actual drug while the other group takes the placebo without being aware of it.
Placebo is an inactive treatment given to a group of people that is made to look like the real drug, but in reality it simply makes the patient believe they're being treated with the drug and that the drug will help them relieve from the symptoms.
By comparing the results from the two groups, this method helps in analyzing the accurate effects of the drug on the patients and helps in proving that it was the drug that actually treated the symptom and that the treatment did not occur by chance or just a mere belief of the patient thinking they will get better because they're being treated.
This approach helps reduce bias and ensures that the trial's results are more accurate and reliable.
So, the sugar pill given to the control group is called a placebo. Therefore, the correct option is A. Placebo
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Write the chemical formula of the compound produced.
Answer:
0.64 g of S
Solution:
The balance chemical equation is as follow,
2 Cu + S ----> Cu₂S
According to equation,
127 g (2 mole) Cu produces = 159 g (1 mole) of Cu₂S
So,
2.54 g Cu will produce = X g of Cu₂S
Solving for X,
X = (2.54 g * 159 g) / 127 g
X = 3.18 g of Cu₂S
Now, it is confirmed that the reaction is 100% ideal. Therefore,
As,
127 g (2 mole) Cu required = 32 g (1 mole) of S
So,
2.54 g Cu will require = X g of S
Solving for X,
X = (2.54 g * 32 g) / 127 g
X = 0.64 g of S
Answer : The total mass of sulfur consumed will be, 0.64 grams and the chemical formula of the compound produced is, copper oxide.
Solution :
According to the law of conservation of mass, the total mass of reactant should be equal to the total mass of product.
The balanced chemical reaction will be,
In this reaction, copper and sulfur are the reactants and copper sulfide is the product.
Let the mass of sulfur be 'x' gram
According to the law of conservation of mass,
Therefore, the total mass of sulfur consumed will be, 0.64 grams and the chemical formula of the compound produced is, copper oxide.
Explanation:
An equation that contains equal number of atoms on both reactant and product side is known as a balanced chemical equation.
Whereas when there will be increase in oxidation number of the atom then it is known as oxidation. When there is decrease in oxidation number of the atom then it is known as reduction.
For example,
Oxidation half reaction :
Reduction half reaction :
Therefore, we can conclude that sulfur atom has undergone oxidation and nitrogen atom has undergone reduction.
The distance (in meters south) the plate will be given that the plate is moving at a rate of 2 cm/year is 80 meters south (last option)
Speed is defined as distance travelled per unit time. This is mathematically written as
Speed = Distance travelled / time
If we make distance the subject, we have
Distance travelled = Speed × time
The following data were obtained from the question:
Distance travelled = Speed × time
Distance travelled = 0.02 × 4000
Distance travelled = 80 meters south
Thus, we can conclude that the distance travelled is 80 meters south (last option)
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the plate will be 80 meters south from its original location in 4,000 years. The correct answer is (d) 80 meters south.
The plate moves south at a rate of 2 cm/year. To find out how many meters south it will be in 4,000 years, we need to convert the years to centimeters and then meters.
In 4,000 years, the plate will have moved: 2 cm/year x 4,000 years = 8,000 cm.
Now, to convert 8,000 cm to meters, we need to divide by 100 (since there are 100 centimeters in a meter):
8,000 cm / 100 = 80 meters.
So, the plate will be 80 meters south from its original location in 4,000 years. The correct answer is (d) 80 meters south.
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Complete question is:
A plate moves south at a rate of 2 cm/year. How many meters south from its original location will the plate be in 4,000 years?
a. 8,000 meters south
b. 4,000 meters south
c. 200 meters south
d. 80 meters south