Answer:
B. The question can be tested in one experiment.
Explanation:
A well defined question is one complete in scope and can support comprehensive investigation through experiment or scientific methods. Here empirical analyses can be carried out to unravel answers to such question. Usually well defined questions could take the form of problem statement or research question.
Answer: -
Sulfuric acid
Explanation: -
The chemical formula of Sulfuric Acid = H₂SO₄
The chemical formula of hydrochloric acid = HCl
In both the cases the concentration of the acid is same.
However from the chemical formula of sulfuric acid we can see that it is a dibasic acid.
So for every mole of sulfuric acid 2 mol of H⁺ would be present.
The above experiment is a type of simple displacement reaction. Thus Mg displaces H⁺ from H₂SO₄ in the above experiment.
Thus if more H⁺ is present, more of Mg reacts in the same amount of time.
Hence the reaction would be faster in sulfuric acid at the start.
Cells, like humans, cannot generate energy without locating a source in their environment. However, whereas humans search for substances like fossil fuels to power their homes and businesses, cells seek their energy in the form of food molecules or sunlight. In fact, the Sun is the ultimate source of energy for almost all cells, because photosynthetic prokaryotes, algae, and plant cells harness solar energy and use it to make the complex organic food molecules that other cells rely on for the energy required to sustain growth, metabolism, and reproduction (Figure 1).
Cellular nutrients come in many forms, including sugars and fats. In order to provide a cell with energy, these molecules have to pass across the cell membrane, which functions as a barrier — but not an impassable one. Like the exterior walls of a house, the plasma membrane is semi-permeable. In much the same way that doors and windows allow necessities to enter the house, various proteins that span the cell membrane permit specific molecules into the cell, although they may require some energy input to accomplish this task (Figure 2).
Answer:
1.53x10^22 atoms of Au
Explanation:
To find the atoms of gold we need first, to convert the mass of gold to moles using molar mass of gold (196.97g/mol). Then, these moles must be converted to number of atoms based on definition of moles (1 mole = 6.022x10²³ atoms).
<em>Moles Au:</em>
5.00g Au * (1mol / 196.97g) = 0.0254 moles of Au
<em>Atoms of Au:</em>
0.0254 moles * (6.022x10²³ atoms / 1 mole) =
<h3>1.53x10^22 atoms of Au</h3>
Alkynes can be reduced to<span> trans</span>-alkenes using Li(lithium) in NH₃(ammonia).
<span>Lithium is a reducing agent.
In this case product is trans-2-butene.
Reaction:
CH</span>₃<span>-C≡C-CH</span>₃ (2-butyne)<span> + 2 Li in N<span>H</span></span>₃<span> (liq) ——>
trans CH</span>₃<span>-CH=CH-CH</span>₃<span> + 2 LiN<span>H</span></span>₂ (lithium-amide).<span><span><span>
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