Answer:
they are used to record the motion of the ground
Explanation:
Answer:
False.
Explanation:
Scientific theories and hypothesis are all tentative. Science tries to prove something is either true of false and come up with answers (as much as we can) for many problems. Sometimes they are made based on limited data or information. Over the years, we come up with need findings discoveries which are able to give us more information and give us better answers. There have been a couple of scientific laws which had to be completely revised or discarded after new observations. An example of this would be the Laws of Thermodynamics. A couple of the laws have been changed over the decades after scientists made new disoveries and observations.
C belongs to Alcohol and compound d belongs to amine
If a 22. 5 mm copper (ii) solution(solution a) had an absorbance of 1. 65. Then, the absorbance if 8 ml of solution a was used to prepare a 20. 0 ml of a new copper (ii) solution is 918.84.
According to Beer-Lambert law, the absorbance (A) of a substance depends on its concentration (c)
A = ε . l. c
where,
ε: absorptivity of the species
l: optical path length
A 22.5 mM phosphate solution (solution A) had an absorbance of 1.012.
A = ε . l . c
1.65 = ε . l . 22.5 mM
ε . l = 37.125 mM⁻¹
We will calculate the concentration of the second solution using the dilution rule.
C₁ . V₁ = C₂ . V₂
22.5mM . 8 mL = C₂ . 20.0 mL
C₂ = 24.75 mM
The absorbance of the second solution is:
A = (ε . l ). c
A = (37.125 mM⁻¹) x 24.75 mM = 918.84
Thus, we find that the value of absorbance is 918.84.
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Answer:
The information necessary would be Nos. 1 (milligrams of Ca), 2 (molar mass of hydroxide) and 4 (molar mass of Calcium)
Explanation:
The calculation of the moles of hydroxide would be the usual stoichiometric calculations, where all that is required is the mass and molar mass of reactants and products, depending on the variable in question. Hence, volume and molarity are not necessarily required to determine amount of product.
<u><em>The information necessary would be Nos. 1 (milligrams of Ca), 2 (molar mass of hydroxide) and 4 (molar mass of Calcium)</em></u>
The reaction equation is:
→ +
<em>N.B. Calcium hydroxide only slightly dissolves in water to form as lightly basic solution; the solubility is increased by increase in temperature.</em>