Can I get help in #6 ?

Answer:

A. The cost of producing a kilowatt of power with fuel cell will be less than $30 in 2015

Answer:

1 Zn + 2 HCl ⇒ 1 H₂ + 1 ZnCl₂

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The lack of an outlet will affect the composition of these lakes by causing an accumulation of organic and inorganic nutrients due to decomposition of living materials.

Lake is a small stream of running water or a channel for water.

Lakes are usually a standing body of water or slow moving. This means that some lakes, including the Great Salt Lake and the Dead Sea, have no outlet.

The lack of an outlet will affect the composition of these lakes by causing an accumulation of organic and inorganic nutrients due to decomposition of living materials.

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Answer:

inner energy shells are involved in radioactive activity

Answer: I think its NUCLEUS

Explanation: Good luck yall

Answer: 800 mL of methyl alcohol should be added to 200 ml of water to make this solution.

Explanation:

Volume of the methyl alcohol = x

Volume of water = y = 200 mL

Volume of the solution ,V = x + y

Volume percentage of solution = 80%

x = 800 mL

800 mL of methyl alcohol should be added to 200 ml of water to make this solution.

The number of formula units of CaCO₃ in Tums is 1.25 times the formula units in Maalox

1 mole of CaCO₃ = 6.02×10²³ formula units

But

1 mole of CaCO₃ = 100 g

Thus,

100 g of CaCO₃ = 6.02×10²³ formula units

For Tums

100 g of CaCO₃ = 6.02×10²³ formula units

Therefore,

0.747 g of CaCO₃ = (0.747 × 6.02×10²³) / 100

0.747 g of CaCO₃ = 4.50×10²¹ formula units

For Maalox

100 g of CaCO₃ = 6.02×10²³ formula units

Therefore,

0.6 g of CaCO₃ = (0.6 × 6.02×10²³) / 100

0.6 g of CaCO₃ = 3.61×10²¹ formula units

Comparison = Tums / Maalox

Tums / Maalox = 4.50×10²¹ / 3.61×10²¹

Tums / Maalox = 1.25

Cross multiply

Tums = 1.25 × Maalox

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Answer: We may only emit about 4% of total emissions, while the natural environment emits the other 96%. But the thing is the natural environment adds and takes out CO2 from the system in roughly equal amounts (at least in the short and medium term). We only add it. We are adding so much of it that the environment can only absorb about half of it, thus the rapid increase in CO2 levels, thus the rapid increase in temperatures.

Explanation:

the electronegativity difference (AEN):

<0.5: covalent (non polar)

0.5- 1.7: covalent (polar)

> 1.7 : ionic

BaCl₂

Ba = 0.9

Cl = 3

Cl - B = 3 - 0.9 = 2.1 (ionic)

Answer: 3.5 moles

Explanation:

For every 2 moles of sulfur consumed, there are 3 moles of oxygen consumed.

This means that sulfur is the limiting reactant, meaning that 2(3)=6 moles of oxygen will be consumed.

Thus, 9.5-6=3.5 moles of oxygen will remain.

Absolute Zero happens when no particles or atoms can move anymore due to the lack of heat. Option A.

Generally, Absolute zero is simply the moment at which all of the atoms have totally halted relatively to each other.

In conclusion, Absolute Zero occurs when no particles or atoms can move owing to a lack of heat.

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Answer:

Explanation:An age-structure diagram provides a snapshot of the current population and can represent information about the past and give potential clues about future problems. When you are interpreting age-structure diagrams, it is important to compare the width of the base to the rest of the population

Stars

All the elements on earth have been cooked from billions of years in stars and the released in the universe through super-nova explosions

Answer:

Seed is the actual medium of reproduction in plants. It could be considered as the result of gametic stage of reproduction producing the basic and fundamental prototype of the parent plant called embryo covered inside a hard protective coat I.e. testa

I read this in 6th std

Answer:

D. 108g of water

Explanation:

16g CH4 produces 2(18)g of H20

1g CH4 produces [tex]\frac{36}{16}[/tex]g of H2O

48g CH4 produces [tex]\frac{36}{16}[/tex]×48

                                108g of H20

Answer:

D. 108g of water

Explanation:

Answer:

1) k2O = 2K(1+) + O(2-)This is, every molecule of K2O

Explanation:

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The heat of vaporization is the heat required to turn 1 gm solid into a liquid. The vapor pressure of diethyl ether at 76 degrees celsius is 1.95 atm.

Vapour pressure is the pressure exerted by the vapors of the equilibrium system. Clausius-Clapeyron equation is used to find the vapor pressure.

[tex]\rm ln \dfrac{P_{2}}{P_{1}} = \rm \dfrac{\delta H}{R} (\dfrac{1}{T_{1}} - \dfrac{1}{T_{2}})[/tex]

Given,

Initial pressure = 0. 703 atm

Initial temperature = 298K

Final temperature = 349 K

Change in enthalpy of vaporization = 29100J/mol

Boltzman constant = 8.314 J/K mol

Substituting values above:

[tex]\begin{aligned} \rm ln \dfrac{P_{2}}{P_{1}} & = \rm \dfrac{\delta H}{R} (\dfrac{1}{T_{1}} - \dfrac{1}{T_{2}})\\\\&= \dfrac{9100}{8.314}(0.0004903)\\\\&= 0.5363\end{aligned}[/tex]

Solving further,

[tex]\begin{aligned} \rm ln \dfrac{P_{2}}{0.703} &= 0.5363\\\\& = \rm e^{0.5363}\\\\&= 1.70\end{aligned}[/tex]

The final pressure is calculated as:

[tex]\rm P_{2} = (0.703 atm)(1.70) = 1.95\;\rm atm[/tex]

Therefore, the vapor pressure at 76 degrees celsius is 1.95 atm.

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Answer:

It was retaliation for the nationalization of U.S. corporations property by Cuba.

Explanation:

Answer:

Cuba created a communist government and a dictatorship made by Fidel Castro. USA obviously did not approve of this so they responded by severing trade and diplomatic relations with Cuba.

Answer:

Braconid wasps lay eggs on the tomato hornworm caterpillar's body. The larvae that hatch from the eggs start feeding on the tissue of the caterpillar. What type of ecological relationship do both the organisms share?

The substance which is mixture of two or more than two metals is called as alloy. Alloy is metallic mixture of any elements.

Alloy is the mixture of two or more than two metal . This mixture may be homogenous or heterogenous ,in both of the phase alloy mixture occur. It may be solid or mixture of many phases.

Alloy are classified into two parts i.e. substitutional alloy and interstitial alloy. An example of alloy is red gold which is the mixture of copper and gold. and there is mixture of silver and gold to make an alloy.

There are different types of alloy present in environment like nickel alloy, zinc alloy, bronze alloy , stainless steel alloy. I an alloy contain ferrous metal it will be rust.

Thus, Alloy is the mixture of two or more than two elements.

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Answer:

The embryo, endosperm, and seed coat are the three major parts of a seed. An embryo is the young multicellular organism formed before it emerges from the seed. A seed is an embryonic plant, which stores food and is enclosed in a protective outer covering, which give rise to a new plant.

Answer:

a,c and d are exothermic

b is the endothermic

Explanation:

exothermic because energy required to form products is less than the energy required to break bonds in reactants.

endothermic because energy required to form products is larger than the energy required to break bonds in reactants.

Answer: 70.9 grams

Explanation:

22.4 L is about 1 mole, meaning that we need to find the mass of 1 mole of chlorine gas, which is about 70.9 grams.

1M HCl solution is weaker

D∅ping is usually used in sports to refer to the act of taking substances that enhance performances.

D∅ping refers to the act of taking substances that are banned in sports.

The word is usually used with respect to sporting events. Certain substances have been found to give athletes a performance advantage over their competitors. These are referred to as d∅pes and are usually banned in most sports.

When a sportsperson takes any of these banned substances, they are said to have d∅ped.

For example, an athlete anabolic steroids before taking part in a sporting event.

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Doping = use of drugs to improve athletic performance.

Doping means taking of some drugs that enhance athletic performance. Many players use doping to enhance their performance. It is illegal, and it is banned. If any player caught doing this, he/she might be suspended for years.

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The IUPAC names of the compound 8 is propional and compound 9 is propanone or ethyl methyl ketone.

International Union of Pure and Applied Chemistry, IUPAC, is naming of the organic compound by the rules of chemistry.

There are some rules, like identifying the functional group, to find the longest carbon chain.

Thus, the  IUPAC names of the compound 8 is propional and compound 9 is propanone or ethyl methyl ketone.

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Answer:

c

Explanation:

chemical decomposition produced by passing an electric current through a liquid or solution containing ions.

Sulfate ions will move from left to right through the salt bridge. The salt bridge allows the passage of ions between solutions.

An electrochemical cell is a cell where electrical energy is produced as a result of chemical reactions.

We have to note that the anions tend to move from the cathode to the anode hence, sulfate ions will move from left to right through the salt bridge.

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Use Relationship between C and V

As per the question ,

[tex]2SO_2(g)+O_2\rightleftharpoons2SO_3(g) [/tex] (given)

[tex]\: \: \: \: \: \: \: \: \: \: \: \: \: \: [/tex]

[tex]K_c = \frac{[SO_3]^2}{[SO_2]^2[O_2]}[/tex]

[tex]\: \: \: \: \: \: \: \: \: \: \: \: \: \: [/tex]

[tex] \: \: \: \: \: = \frac{ ( 1.9)^2M^2}{(0.6)^2(0.82)M^3} [/tex]

[tex]\: \: \: \: \: \: \: \: \: \: \: \: \: \: [/tex]

[tex] \: \: \: \: = 12.229 M^{ - 1}[/tex] (approximately)

[tex]\: \: \: \: \: \: \: \: \: \: \: \: \: \: [/tex]

Hence , K for the equilibrium is [tex]12.229M^{-1}[/tex]