Answer:
- <u>1. Since the temperature of your body is higher than the temperature of the air and of the water, heat will flow from your body to the air and pool.</u>
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- <u>2. The pool feels cooler than air because the water can absorb heat energy faster than the air, due to liquids are better conductors than gases.</u>
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Explanation:
Heat always flows from warmer substances to colder ones.
The normal body temperature is 98ºF. Therefore, the heat will flow from your body to the air and pool, which are at a lower temperature of 80ºF. In both cases, you will lose thermal energy and the external parts of your body will cool down.
The difference between both cases is in the heat conduction capacity of both air and water.
Liquids (and solids) are better <em>thermal conductors </em>than gases because the conduction of heat occurs as result of the direct contact between the particles of matter: the atoms or molecules in hot matter vibrate faster than their neighbors and transmit them kinetic energy by direct contact.
Therefore, the liquid water in the swimming pool, at the same temperature than the air, will be able to absorb more heat in the same time from the body.
In conclusion, the body will cool down faster in water than in air which is why the pool feels cooler than air.
The product will not be affected by the addition of twice as much Na₂CO₃.
<h3>What is Limiting reagent in stoichiometry ?</h3>
- The maximum quantity of the end product determined by a balanced chemical equation is known as the Stoichiometry.
- The limiting reactant is the one that is consumed first and sets a limit on the quantity of product(s) that can be produced, and the one which remains unconsumed after the final reaction is in Excess.
- Calculate the moles of each reactant present and contrast it with the mole ratio of the reactants in the balanced equation to determine which reactant is the limiting one.
Here,taking the stoichiometry into consideration, we find that the reaction happens with 1:1 ratio; so, adding twice the amount of Na₂CO₃ will lead to its excess making the other the limiting reactant, hence, it would not affect the yield of the product.
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Answer: Ions in ionic compounds are arranged in a repeating pattern of alternating charges, whereas metals consist of fixed cations surrounded by a sea of mobile, or delocalized, electrons. ... Delocalized electrons can move through the solid to conduct an electric current.
Explanation:
The volume of the liquid in each cylinder are given below
A. 48.9 mL
B. 48.5 mL
C. 11 mL
<h3>Shape of liquid in a cylinder</h3>
A liquid in a cylinder tends to show a curved shape due to adhesion.
Hence, to get an accurate measurement, we must take the reading at the lower meniscus (i.e under the curve shape of the liquid)
<h3>A. How to determine the volume of the cylinder</h3>
From the diagram given, we can see that the lower meniscus (i.e under the curve) is 48.9 mL since 10 lines exist between 48 and 49. Thus, the volume of the liquid is 48.9 mL
<h3>B. How to determine the volume of the cylinder</h3>
From the diagram given, we can see that the lower meniscus (i.e under the curve) is 48.5 mL since 10 lines exist between 48 and 49. Thus, the volume of the liquid is 48.5 mL
<h3>C. How to determine the volume of the cylinder</h3>
From the diagram given, we can see that the lower meniscus (i.e under the curve) is 11 mL since 5 lines exist between 10 and 15. Thus, the volume of the liquid is 11 mL
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Answer:
Hydrogen sulfide reacts with aqueous selenous acid to produce selenium disulfide:
H2SeO3 + 2 H2S → SeS2 + 3 H2O
Selenium disulfide consists of 8-membered rings. It has an approximate composition of SeS2, with individual rings varying in composition, such as Se4S4 and Se2S6. Selenium disulfide has been used in shampoo as an antidandruff agent, an inhibitor in polymer chemistry, a glass dye, and a reducing agent in fireworks.[15]
Selenium trioxide may be synthesized by dehydrating selenic acid, H2SeO4, which is itself produced by the oxidation of selenium dioxide with hydrogen peroxide:[17]
SeO2 + H2O2 → H2SeO4
Hot, concentrated selenic acid can react with gold to form gold(III) selenate.[18]