Answer:
Pseudoscience
Explanation:
Predicting the future based solely on the position of the planets is an example of <u>pseudoscience</u>.
<em>Pseudoscience is a body of knowledge that is not based on the scientific method but on some unverifiable/unprovable claims.</em>
Predictions about the future can only be valid if it is based on the scientific method, not just about the position of the planet. The scientific method involves observation, hypothesis formulation, testing of the hypothesis through repeatable experiments, and arriving at conclusion.
Any other statement or belief that is not based on these procedures is said to be pseudoscientific.
Answer:
Explanation:
<u>1) Data:</u>
<u />
a) Acetic acid CH₃COOH
b) molar mass of CH₃COOH: 60.052 g/mol
c) %: = 5.00%
d) d = 1.006 g/ml
e) M = ?
<u>2) Formulae:</u>
a) M = n of solute / V of solution in liters
b) n = mass in grams / molar mass
c) % = (mass of solute / mass of solution)×100
d) d = mass / volume
<u>3) Solution:</u>
a)<u> Assume a basis </u>
b) <u>Calculate the mass of that basis (1 liter of solution)</u>
- d = mass / V ⇒ mass = d × V
- mass = 1.006 g/ml × 1 liter × 1,000 ml/liter = 1006 g
c) <u>Calculate the mass of solute</u>
<u />
- % = (mass of solute / mass of solution ) × 100 ⇒
mass of solute = % × mass of solution / 100 = 5.00% × 1,006 g / 100
mass of solute = 50.3 g
d) <u>Calculate the number of moles of solute</u>
<u />
- n = mass in grams / molar mass = 50.3 g / 60.052 g/mol = 0.838 mol
e) <u>Calculate molarity</u>
- M = n / V in liter = 0.838 mol / 1 liter = 0.838 M ← answer
Answer:
69.8 %.
Explanation:
2Na + Cl2 = 2NaCl
Using Relative Atomic Masses:
2*22.99 g sodium should produce 2*(22.99 + 35.45) = 116.88 g of sodium chloride
So 5.75 g Na should give 116.88 * 5.75 / 2*22.99 g = 14.62 g NaCl
% yield = 10.2 / 14.62 = 69.8%.
Answer:
Option b, Irreversible hydrocolloid impression material
Explanation:
Irreversible is used as an impression material to take impression from edentulous jaws. It is also used in wound healing and drug delivery.
Alginate is a natural polymer found in cell wall of brown seaweed.
Its monomers are β-D-mannuronate and α-L-guluronate.
In association with Ca2+, it forms gel. It is hydrophilic in nature.
Answer: Order with respect to A is 1 , order with respect to B is 0 and total order is 1
Explanation:
Rate law says that rate of a reaction is directly proportional to the concentration of the reactants each raised to a stoichiometric coefficient determined experimentally called as order.
![Rate=k[A]^x[B]^y](https://tex.z-dn.net/?f=Rate%3Dk%5BA%5D%5Ex%5BB%5D%5Ey)
k= rate constant
x = order with respect to A
y = order with respect to A
n = x+y = Total order
a) From trial 1: ![3.20\times 10^{-1}=k[1.50]^x[1.50]^y](https://tex.z-dn.net/?f=3.20%5Ctimes%2010%5E%7B-1%7D%3Dk%5B1.50%5D%5Ex%5B1.50%5D%5Ey)
(1)
From trial 2: ![3.20\times 10^{-1}=k[1.50]^x[2.50]^y](https://tex.z-dn.net/?f=3.20%5Ctimes%2010%5E%7B-1%7D%3Dk%5B1.50%5D%5Ex%5B2.50%5D%5Ey)
(2)
Dividing 2 by 1 :![\frac{3.20\times 10^{-1}}{3.20\times 10^{-1}}=\frac{k[1.50]^x[2.50]^y}{k[1.50]^x[1.50]^y}](https://tex.z-dn.net/?f=%5Cfrac%7B3.20%5Ctimes%2010%5E%7B-1%7D%7D%7B3.20%5Ctimes%2010%5E%7B-1%7D%7D%3D%5Cfrac%7Bk%5B1.50%5D%5Ex%5B2.50%5D%5Ey%7D%7Bk%5B1.50%5D%5Ex%5B1.50%5D%5Ey%7D)
therefore y=0
b) From trial 2: (3)
From trial 3: ![6.40\times 10^{-1}=k[3.00]^x[1.50]^y](https://tex.z-dn.net/?f=6.40%5Ctimes%2010%5E%7B-1%7D%3Dk%5B3.00%5D%5Ex%5B1.50%5D%5Ey)
(4)
Dividing 4 by 3:![\frac{6.40\times 10^{-1}}{3.20\times 10^{-1}}=\frac{k[3.00]^x[1.50]^y}{k[1.50]^x[2.50]^y}](https://tex.z-dn.net/?f=%5Cfrac%7B6.40%5Ctimes%2010%5E%7B-1%7D%7D%7B3.20%5Ctimes%2010%5E%7B-1%7D%7D%3D%5Cfrac%7Bk%5B3.00%5D%5Ex%5B1.50%5D%5Ey%7D%7Bk%5B1.50%5D%5Ex%5B2.50%5D%5Ey%7D)
, x=1
Thus rate law is ![Rate=k[A]^1[B]^0](https://tex.z-dn.net/?f=Rate%3Dk%5BA%5D%5E1%5BB%5D%5E0)
Thus order with respect to A is 1 , order with respect to B is 0 and total order is 1+0=1.
