Explanation:
Self fulfilling prophecy means how our expectations or expectations of others influence our own behavior. Being self fulfilling means, to bring about a result that has been already foretold or talked about.
Whereas Stereotype is a preconceived notion about a particular type of person or thing. for examples woman as driver are not so good is an stereotype. However, the idea may untrue or partly true.
Answer:
D. The telescope detects high-energy electromagnetic waves.
Explanation:
First of all, let's define what X-rays are.
X-rays are electromagnetic waves at high frequency and short wavelength.
The wavelength of X-rays span between 0.01 and 10 nanometers. X-rays are the second-highest frequency electromagnetic waves, after gamma rays, which have higher frequency.
The energy of an electromagnetic wave is directly proportional to its frequency, according to the equation:
where:
h is the Planck constant
f is the frequency of the wave
Since X-rays are high-frequency electromagnetic waves, it means that they also are high-energy electromagnetic waves.
Therefore, the correct answer is
D. The telescope detects high-energy electromagnetic waves.
Answer:
A 50-mL volumetric cylinder with 0.1-mL accuracy scale should be used for this purpose since three significant figures of accuracy are required.
Explanation:
Hello,
A 50-mL volumetric cylinder with 0.1-mL accuracy scale should be used for this purpose since three significant figures of accuracy are required.
Best regards.
Answer:
The answer to your question is A. 0.0066 moles or 6.6 x 10⁻³ moles
B. C₁₂H₂₂O₁₁ + 12 O₂ ⇒ 12 CO₂ + 11H₂O
Explanation:
A.
Data
mass of sugar water = 9 g
concentration = 25%
moles of sugar (C₁₂H₂₂O₁₁)
Formula
Mass percent = mass of solute/mass of solution x 100
-Solve for mass of solute
Mass of solute = (mass percent x mass of solution) / 100
-Substitution
Mass of solute = (25 x 9)/100
-Result
Mass of solute = 225/100
= 2.25 g of sugar
-Calculate the molar mass of sugar
C₁₂H₂₂O₁₁ = (12 x 12) + (22 x 1) + (11 x 16)
= 144 + 22 + 176
= 342 g
-Calculate the moles of sugar
342 g ---------------------- 1 mol
2.25 g ------------------- x
x = (2.25 x 1) / 342
x = 2.25/342
x = 0.0066 moles or 6.6 x 10⁻³ moles
B. Balanced chemical reaction
C₁₂H₂₂O₁₁ + 12 O₂ ⇒ 12 CO₂ + 11H₂O
9 ÷ 45 = 0,2 g/ml
I hope you enjoy!