Answer:
4.96E-8 moles of Cu(OH)2
Explanation:
Kps es the constant referring to how much a substance can be dissolved in water. Using Kps, it is possible to know the concentration of weak electrolytes. Then, pKps is the minus logarithm of Kps.
Now, we know that sodium hydroxide (NaOH) is a strong electrolyte, who is completely dissolved in water. Therefore the pH depends only on OH concentration originating from NaOH. Let us to figure out how much is that OH concentration.
This concentration of OH affects the disociation of Cu(OH)2. Let us see the dissociation reaction:
In the equilibrum, exist a concentration of OH already, that we knew, and it will be added that from dissociation, called "s":
The expression for Kps is:
The moles of (CuOH)2 soluble are limitated for the concentration of OH present, according to the next equation.
"s" is the soluble quantity of Cu(OH)2.
The solution for this third grade equation is
Now, let us calculate the moles in 1 L:
If you look at the equation for photosynthesis, it is:
<span>6CO2 + 6H2O + light energy ---> C6H12O6 + 6O2
</span>
Since CO2 (carbon dioxide) is on the left side of the equation, it is being consumed, or used up. Since O2 (oxygen) is on the right side, it is being produced.
The correct answer is the first one, "<span>Carbon dioxide is used up, and oxygen is produced."</span>
Earth's atmosphere has mainly five layers as
exosphere, thermosphere, mesosphere, stratosphere and troposphere. The
composition of atmosphere is 78 % of N₂,
21 % of O₂, 1 % of Ar and rest
is CO₂ and trace gases.
Earth's atmosphere helps to make suitable conditions for living things by<span>
1. blocking harmful uv rays by ozone
layer
<span> 2. trapping heat to maintain the temperature on
Earth's surface</span>
3. having O₂ gas for breathing of living things</span><span>
4. having CO₂ gas which is used to make foods by
photosynthesis</span><span>
<span> 5. creating pressure on Earth's
surface to keep water in its liquid form.</span></span>
Answer:
0.0626 M
Explanation:
Equation of the reaction
CH3COOH(aq) + NaOH(aq) ---------> CH3COONa(aq) + H2O
Concentration of acid CA= ???
Concentration of base CB= 0.1943 M
Volume of acid VA= 10.0ml
Volume of base VB= 32.22 ml
Number of moles of acid NA= 1
Number of moles of base NB= 1
From
CA= CB VB NA/VA NB
Hence ;
CA= 0.1943 M × 32.22 ml × 1/10.0ml ×1
CA= 0.0626 M
Answer:
B. the role of creativity in scientific discovery
Explanation:
Watson and Crick's ball-and-stick model of DNA demonstrates the importance of creativity in science. Creativity involves having a questioning mind that is always searching for answers and which employs logical reasoning to arrive at these answers. After Rosalind Franklin obtained an X-ray diffraction of DNA, Scientists Watson and Crick expanded on this knowledge by creatively organizing ball and sticks in a manner that represenseted the structure of the DNA.
This simple creative act led to more discoveries about the DNA including the facts that their was a pairing wherein Adenine paired with Thymine and Cytosine paired with Guanine. They also found that the DNA structure could be unzipped and that copying was also possible. They used the simple things around them to arrive at this conclusion. This is an example of the importance of creativity in science.