CHEMISTRY HIGH SCHOOL

Sodium chloride, NaCl forms in this reaction between sodium and chlorine. 2Na(s) + Cl2(g) → 2NaCl(s) How many moles of NaCl result from the complete reaction of 3.9 mol of Cl2? Assume that there is more than enough Na.

Answers

Answer 1

Answer:

Answer: 7.8 moles of NaCl result from the complete reaction of 3.9 mol of $Cl_2$

Explanation:

To calculate the moles :

$\text{Moles of solute}=\frac{\text{given mass}}*{\text{Molar Mass}}$

$\text{Moles of} Cl_2=3.9mol$

$2Na(s)+Cl_2(g)\rightarrow 2NaCl(s)$

As $Na$ is the excess reagent, $Cl_2$ is the limiting reagent as it limits the formation of product.

According to stoichiometry :

1 mole of $Cl_2$ gives = 2 moles of $NaCl$

Thus 3.9 moles of $Cl_2$ will give= $\frac{2}1}* 3.9=7.8moles$ of $NaCl$

7.8 moles of NaCl result from the complete reaction of 3.9 mol of $Cl_2$

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Why is tin foil a good insulator

Answers

Tin foil is a heat insulator because it can reflect radiation. When tin foil, for instance, is wrapped around an object, air can be trapped. Trapped air is a good insulator against convection.

Energy transfer by convection is primarily restricted toA. gases.
B. liquids.
C. solids.
D. fluids.
E. none of the above

Answers

The answer is fluids.

Final answer:

Convection is the transfer of heat in a fluid (which can be a liquid or gas) through the movement of its particles. A fluid near a heat source will get heated, causing it to rise and exchange place with the cooler, denser fluid.

Explanation:

Energy transfer by convection is primarily restricted to both liquids and gases, which are both classified as fluids. Hence, the correct answer is D. Fluids.

Convection refers to heat transfer in a gas or liquid by the circulation of currents from one region to another. This happens when a fluid near a heat source gets heated, its particles move faster and spread apart, causing the fluid to become less dense. As a result, the warmer, less dense fluid rises, and the cooler, denser fluid sinks. The continuous movement of fluid in this way creates what we call a convection current, which results in the transfer of energy.

Learn more about Energy Transfer by Convection here:

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Explain how interactions can be both beneficial and harmful to the organism in a community

Answers

Interactions to an organism can be both harmful and beneficial due to the organism's circumstances. For example by adding tadpoles to an eco system it results in the tadpoles eating all the food thus killing the other organisms. Whereas by adding plants to an ecosystem it provides shelter for the organisms and possibly food being beneficial.

Answer:

An ecological community consists of all the populations of all the different species that live together in a particular area.

Interactions between different species in a community are called interspecific interactions.

The main types of interspecific interactions include competition, predation, mutualism, commensalism, and parasitism.

Symbiosis

Symbiosis occur when two species live together in a long-term, intimate association. In everyday life, we sometimes use the term symbiosis to mean a relationship that benefits both parties

Parasitism

It involves two species have a close, lasting interaction that is beneficial to one, the parasite, and harmful to the other, the host.

Commensalism

In a commensalism, two species have a long-term interaction that is beneficial to one and has no positive or negative effect on the other. For instance, many of the bacteria that inhabit our bodies seem to have a commensal relationship with us. They benefit by getting shelter and nutrients and have no obvious helpful or harmful effect on us.

Mutualism

In a mutualism, two species have a long-term interaction that is beneficial to both of them. For example, some types of fungi form mutualistic associations with plant roots. The plant can photosynthesize, and it provides the fungus with fixed carbon in the form of sugars and other organic molecules

Predation

In predation, a member of one species—the predator—eats part or all of the living, or recently living, body of another organism—the prey. This interaction is beneficial for the predator, but harmful for the prey. Predation may involve two animal species, but it can also involve an animal or insect consuming part of a plant, a special case of predation known as herbivory

A certain substance melts at a temperature of . But if a sample of is prepared with of urea dissolved in it, the sample is found to have a melting point of instead. Calculate the molal freezing point depression constant of . Round your answer to significant digits.

Answers

Answer:

2.2 °C/m

Explanation:

It seems the question is incomplete. However, this problem has been found in a web search, with values as follow:

" A certain substance X melts at a temperature of -9.9 °C. But if a 350 g sample of X is prepared with 31.8 g of urea (CH₄N₂O) dissolved in it, the sample is found to have a melting point of -13.2°C instead. Calculate the molal freezing point depression constant of X. Round your answer to 2 significant digits. "

So we use the formula for freezing point depression:

ΔTf = Kf * m

In this case, ΔTf = 13.2 - 9.9 = 3.3°C

m is the molality (moles solute/kg solvent)

350 g X ⇒ 350/1000 = 0.35 kg X

31.8 g Urea ÷ 60 g/mol = 0.53 mol Urea

Molality = 0.53 / 0.35 = 1.51 m

So now we have all the required data to solve for Kf:

ΔTf = Kf * m

3.3 °C = Kf * 1.51 m

Kf = 2.2 °C/m

a sample of aluminum is placed in a 25.0 ml graduated cylinder containing 10.0 ml of water the level of the water rises to 18.0 ml aluminum has a density of 2.70 g/mL what is the mass?