the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.
Answer:
The answer to your question is
51.- 1.59 x 10⁻⁶
53.- NaHCO₃ + HCl ⇒ H₂O + CO₂ + NaCl
Explanation:
51.- Convert 0.00159 ml to liters
Use a rule of three
1000 ml -------------- 1 l
0.00159 ml --------- x
x = (0.00159 x 1) / 1000
x = 0.00000159 l = 1.59 x 10⁻⁶ l
53.- Sodium hydrogen carbonate (NaHCO₃) reacts with hydrochloric acid to produce salt, water and carbon dioxide.
Sodium hydrogen carbonate = NaHCO₃
Hydrochloric acid = HCl
Reaction
NaHCO₃ + HCl ⇒ H₂O + CO₂ + NaCl
water = H₂O
carbon dioxide = CO₂
salt = NaCl
Answer:
a) Absorbance
b) The absorb light most strongly in 580nm
Explanation:
Beer-Lambert law relates concentration with light absorbance. The more concentrated solution are the more molecules and the most absorbance.
Wavelenght depends of composition of solution and doesn't change with different concentrations of the same solution.
Transmittance is inversely proportional to absorbance. Thus, the more concentrated solution the less transmittance.
Colored compounds are absorb energy of visible radiation. The colour that we see is a result of the absortion of complimentary colour (Colour wheel). Thus, a blue-green solution absorb energy of ≈600 nm. Thus, the absorb light most strongly in 580nm.
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Answer:
1. Calcium and fluorine
Symbol Ca F
Charges +2 1−
Formula CaF
2
2. Hydrogen and sulphur
Symbol H S
Charges 1+ 2−
Formula H
2
S
3. Nitrogen and hydrogen
Symbol N H
Charges 3− 1+
Formula NH
3
4. Carbon and chlorine
Symbol C Cl
Charges 4+ 1−
Formula CCl
4
5. Sodium and oxygen
Symbol Na O
Charges 1+ 2−
Formula Na
2
O
6. Carbon and oxygen.
Symbol C O
Charges 4+ 2−
C
2
O
4
i. e.
Formula CO
2
Explanation:
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Metal is a great conductor of heat while rope does not collect heat from the radiation from the sun as much or contain it while if metal is out in the sun all day it just keeps getting hotter and hotter and when you touch the rope it does not have much heat to transfer but the metal slide is hot enough to irritate your skin
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