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Vaselesa [24]
3 years ago
15

Which of the following BEST describes fundamental research?

Chemistry
2 answers:
AleksAgata [21]3 years ago
8 0
First one is False. The second is true.
Andrew [12]3 years ago
7 0
1. Research focused on certain principles like energy, light, the body, and earth

2.All of the above

Explanation:
The Earth has a limited amount of fresh water meaning eventually the availability of water would be decline. In the future the technology that assist is desalinization process will be readily available on the market. Due to demand and supply law...persons will demand fresh water and will pay any price for water. [E.g. One liter of water may cost $50]

3. True
4. True



Question 29 answer
1.E
2.C
3.A
4.D
5.B

Question 30 and 31 is correct
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Suppose a student started with 142.0 mg of trans-cinnamic acid, 412 mg of pyridinium tribromide, and 2.30 mL of glacial acetic a
nirvana33 [79]

Answer: Theoretical Yield = 0.2952 g

               Percentage Yield = 75.3%

Explanation:

Calculation of limiting reactant:

n-trans-cinnamic acid moles = (142mg/1000) / 148.16 = 9.584*10⁻⁴ mol

pyridium tribromide moles = (412mg/1000) / 319.82= 1.288*10⁻³ mol

  • n-trans-cinnamic acid is the limiting reactant

The molar ratio according to the equation mentioned is equals to 1:1

The brominated product moles is also = 9.584*10⁻⁴ mol

Theoretical yield = (9.584*10⁻⁴ mol) * (Mr of brominated product)

                             =  (9.584*10⁻⁴ mol) * (307.97) = 0.2952 g

Percentage Yield is : Actual Yield / Theoretical Yield = 0.2223/0.2952

                                                                                           = 75.3%

4 0
3 years ago
15 grams of sodium reacts with a certain amount of chlorine to yield 37 grams of sodium chloride, as shown below.
ale4655 [162]

Answer: 22g of chlorine would be needed to carry out this synthesis reaction

Explanation:

A synthesis reaction is one in which two or more than two elements combine together to forma single product.

Na+Cl\rightarrow NaCl

The atoms present in the reactants are found on the product side. According to the law of conservation of mass, the number of atoms on both sides of the arrow must be same as the total mass must be conserved.

15 grams of sodium reacts with 22 grams of chlorine to yield 37 grams of sodium chloride. Thus 22g of chlorine would be needed to carry out this synthesis reaction.

4 0
3 years ago
Classify each of the following substances as an acid or a base according to the Arrenius Definition:
Vladimir79 [104]

Answer:

i dont know lol

Explanation:

7 0
3 years ago
What is the change in energy ?e of the hydrogen atom as the electron makes the transition from the n=3 energy level to the n=1 e
Contact [7]
The change in energy is is  known as work-energy
5 0
3 years ago
How many electrons do all atoms want to have in their outer energy level?
34kurt

Answer: 8 electrons

Explanation:

4 0
3 years ago
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