Lightning is caused by
a. water droplets losing electrons when they collide in a cloud
b. the high temperatures in the atmosphere during summer
c. charged particles colliding with earth’s magnetic field
d. a shockwave caused by thunder

The empirical formula of the compound containing 90 g carbon, 11 g hydrogen and 35 g nitrogen is C₆H₉N₂

Divide by their molar mass

C = 90 / 12 = 7.5

H = 11 / 1 = 11

N = 35 / 14 = 2.5

Divide by the smallest

C = 7.5 / 2.5 = 3

H = 11 / 2.5 = 4.4

N = 2.5 / 2.5 = 1

Multiply by 2

C = 3 × 2 = 6

H = 4.4 × 2 ≈ 9

N = 1 × 2 = 2

Thus, the empirical formula of the compound is C₆H₉N₂

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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:

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: 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.

Taking into account the definition of pH and pOH, the solution has a pOH of 6.92 and a pH of 7.08.

pH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.

The pH is defined as the negative base 10 logarithm of the activity of hydrogen ions, that is, the concentration of hydrogen ions or H₃O⁺:

pH= - log [H⁺]= - log [H₃O⁺]

Similarly, pOH is a measure of hydroxyl ions in a solution and is expressed as the logarithm of the concentration of OH⁻ ions, with the sign changed:

pOH= - log [OH⁻]

The following relationship can be established between pH and pOH:

pOH + pH= 14

A solution has an [OH⁻] concentration of 1.20×10⁻⁷ M. Replacing in the definition of pOH:

pOH= - log (1.20×10⁻⁷ M)

Solving

pOH= 6.92

Then, pH is calculated as:

pH + 6.92= 14

pH= 14 - 6.92

pH= 7.08

Finally, the solution has a pOH of 6.92 and a pH of 7.08.

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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:

An exothermic exchange by conduction

Explanation:

Because the heating system (the bonfire) is what is conducting the energy, and is transferring said energy to it’s surroundings, this is an exothermic exchange.

Answer:

c

Explanation:

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

Answer:

inner energy shells are involved in radioactive activity

Answer: I think its NUCLEUS

Explanation: Good luck yall

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

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:

C.) Middle

Explanation:

A.) is incorrect because elements on the bottom of the periodic table can be metals, nonmetals, or metalloids. However, the majority of these elements would be metals.

B.) is incorrect because elements on the right side (aka. the p-block) of the periodic table are mostly nonmetals. This excluding the stair case elements which are metalloids and elements to the left of the stair case which are metals.

C.) is correct because elements located in the middle of the periodic table (aka. the d-block) are always metals. The elements in this section are usually nicknamed the "transition metals". It should be noted that elements on the left side (aka. the s-block) of the periodic table are also metals (excluding hydrogen).

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.

Hope it help you

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: 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.

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:

1 Zn + 2 HCl ⇒ 1 H₂ + 1 ZnCl₂

Hope this helps!!!

Answer:

21.4 M

Explanation:

7.5 mole / ( 350/1000) = 21.4 M

1M HCl solution is weaker

Answer:

false

Explanation:

Elements are pure substance. A ball of sodium will only have sodium atoms.

The pressure exerted when both gases are put together in a single 1 liter container is 5 atm.

Pressure is the force exerted by any object on another object.

Given that, a and b separate 1 liter containers and exert pressure of 2 atm and 3 atm respectively.

When both gases a and b exert together, the pressure then

2 atm + 3 atm = 5 atm.

Thus, the pressure exerted when both gases are put together in a single 1 liter container is 5 atm.

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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:

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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The amount of chalcopyrite must be mined to obtain 500g of pure Cu is 1.4 kilograms.

Relation between the mass and moles of any substance will be represented as:

n = W/M, where

Moles of Cu = 500g / 63.5g/mol = 7.87 mole

Given chemical reaction is:

CuFeS₂ → Cu²⁺ + Fe²⁺ + 2S²⁻

From the stoichiometry of the reaction, it is clear that

1 mole of Cu = produced by 1 mole of CuFeS₂

7.87 mole of Cu = produced by 7.87 mole of CuFeS₂

Mass of given moles of CuFeS₂ = (7.87mol)(183.5g/mol) = 1,444.14g = 1.4kg

Hence required mass of CuFeS₂ is 1.4 kg.

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Answer:

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

Use Relationship between C and V

Answer:

a. insoluble.

Explanation:

This is the opposite of soluble, which means things can dissolve in a liquid, so insoluble means a solid cannot dissolve in a liquid.

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Answer:

(c) Fe2O3 + 3CO → 2Fe + 3CO2

Explanation:(c) Fe2O3 + 3CO → 2Fe + 3CO2

Carbon monoxide (CO) is the reducing agent, it has reduced ferric oxide (Fe2O3) which acts as an oxidising agent.

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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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