The increase in boiling point from CH4, SiH4, GeH4 to SnH4 is caused by the increase in strength of which type of intermolecular force?

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?

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:

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:

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

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]

Answer:

1 Zn + 2 HCl ⇒ 1 H₂ + 1 ZnCl₂

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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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The concentration of the new solution of the ammonium sulphate, (NH₄)₂SO₄ given the data is 0.4 M

Mole = mass / molar mass

Mole of (NH₄)₂SO₄ = 66.05 / 132.1

Mole of (NH₄)₂SO₄ = 0.5 mole

Molarity = mole / Volume

Molarity of (NH₄)₂SO₄ = 0.5 / 0.25

Molarity of (NH₄)₂SO₄ = 2 M

M₁V₁ = M₂V₂

2 × 10 = M₂ × 50

20 = V₂ × 50

Divide both side by 50

M₂ = 20 / 50

M₂ = 0.4 M

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Answer:

A: 0.400 M

Explanation:

Answer:

To calculate the pH of an aqueous solution you need to know the concentration of the hydronium ion in moles per liter (molarity). The pH is then calculated using the expression: pH = - log [H3O+].

Explanation:

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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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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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:

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

Answer:

inner energy shells are involved in radioactive activity

Answer: I think its NUCLEUS

Explanation: Good luck yall

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: 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:

Answer:

c

Explanation:

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

For the molecule propylamine, structural formula and its Lewis dot structure is attached below in image.

Lewis structures, or electron dot structures, are diagrams that show how electrons are shared and distributed around atoms. Lone pairs are electrons that belong to a single atom and are represented by dots.

In normal structural formula of propylamine only bonds are showing and in Lewis dot structure with bonds number of lone pair of electrons or charge present on any atom is also showed. Each single bond present in the structure is formed by the sharing of 2 electrons and it is shown in the attached image.

Hence structural formula and Lewis dot structure is attached in the image.

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Use Relationship between C and V

Answer:

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

Explanation:

hope this helps if not let me know have a blessed day

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: 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.

Answer: 0.151 M

Explanation:

We first need to convert the amount of KCl into moles. This is 8.45/74.55 = 0.113 moles.

So, the molarity is 0.113/0.750 = 0.151 M

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.

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.

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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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: 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 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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