Answer:
Explanation:
Considering the Henderson- Hasselbalch equation for the calculation of the pH of the buffer solution as:
Where Ka is the dissociation constant of the acid.
pKa of phenolphthalein = 9.40
pH = 10.9
So,
Answer:
<em>The statement which is false is b. Electrons are negatively charged and have a mass of 1 amu.</em>
Explanation:
Protons can be described as the positively charged part of an atom. Neutrons are the part of an atom which do not carry ant charge. The protons and neutrons are present in the nucleus of an atom. The atomic mass unit of a proton and a neutron is almost 1.
Electrons are the negative charge particles of an atom. They do not have a mass of 1 atomic mass unit. Their atomic mass unit is almost zero. Hence, option B is false.
Answer:
corrosiveness is a chemical property
Answer:
The molarity of the solution is 0,99M
Explanation:
We calculate the weight of 1 mol of NaCl from the atomic weights of each element of the periodic table. Then, we calculate the molarity, which is a concentration measure that indicates the moles of solute (in this case NaCl) in 1000ml of solution (1 liter)
Weight 1 mol NaCl= Weight Na + Weight Cl= 23 g + 35, 5 g= 58, 5 g
58, 5 g-----1 mol NaCl
145 g ---------x= (145 g x 1 mol NaCl)/58, 5 g= 2,48 mol NaCl
2,5 L solution------ 2, 48 mol NaCl
1 L solution------x= (1 L solutionx 2, 48 mol NaCl)/2,5L solution
x=0,99 mol NaCl---> The solution is 0,99 molar (0,99 M)
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Answer:
<u><em>The correct option is C) the moon takes the same time to rotate and revolve.</em></u>
Explanation:
Scientific experiments have concluded that it takes approximately 23 days for the moon to rotate and also it takes the same duration for the moon to revolve around the Earth. Due to this consistency, the moon appears to be still.
<em>Such synchronization results in the same face of the moon to be directed towards the Earth. Hence, the same craters of the moon will be observed by the scientist every day.</em>
<em></em>
Other options, like option D, is not correct because there will be craters on the other side of the moon too. But as we see the same side of the moon, hence we cannot see the craters present on the other side of the moon.