I have to do this for homework please help :)

Answer:

8.8g of Al are necessaries

Explanation:

Based on the reaction, 2 moles of Al are required to produce 3 moles of hydrogen gas.

To solve this question we must find the moles of H2 in 11L at STP using PV = nRT. With these moles we can find the moles of Al required and its mass as follows:

Moles H2:

PV = nRT; PV/RT = n

Where P is pressure = 1atm at STP; V is volume = 11L; R is gas constant = 0.082atmL/molK and T is absolute temperature = 273.15K at STP

Replacing:

1atm*11L/0.082atmL/molK*273.15K = n

n = 0.491 moles of H2 must be produced

Moles Al:

0.491 moles of H2 * (2mol Al / 3mol H2) = 0.327moles of Al are required

Mass Al -Molar mass: 26.98g/mol-:

0.327moles of Al * (26.98g / mol) = 8.8g of Al are necessaries

Answer:

A: Hydrogen bonding causes water to be strongly cohesive.

Explanation:

Water has a high surafce tension. Hence droplets of water

Water cannot dissolve non polar substances like oil; only polar

Water is actually less dense in solid form :)

Hydrogen bonding causes water to be strongly cohesive.

This sticking together of like substances is called cohesion. Depending on how attracted molecules of the same substance are to one another, the substance will be more or less cohesive. Hydrogen bonds cause water to be exceptionally attracted to each other. Therefore, water is very cohesive.

Cohesion, also called cohesive attraction or cohesive force, is the action or property of like molecules sticking together, being mutually attractive. It is an intrinsic property of a substance that is caused by the shape and structure of its molecules, which makes the distribution of surrounding electrons irregular when molecules get close to one another, creating an electrical attraction that can maintain a microscopic structure such as a water drop. In other words, cohesion allows for surface tension, creating a "solid-like" state upon which light-weight or low-density materials can be placed.

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Answer:

Deep ocean trenches, volcanoes, island arcs, submarine mountain ranges, and fault lines are examples of features that can form along plate tectonic boundaries. Volcanoes are one kind of feature that forms along convergent plate boundaries, where two tectonic plates collide and one moves beneath the other.

Explanation:

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Please brainiest

Answer:

they are all true

Explanation:

Answer:

D

Explanation:

Mars is nearest to Earth

Among the given planets, Mercury would make the closest approach to Earth as it orbits the Sun. This is because Mercury has the smallest average distance from the Sun, with a value of 0.387 astronomical units (AU).

The distances of the planets from the Sun are measured in astronomical units, where 1 AU is the average distance between the Earth and the Sun. With a distance of 0.387 AU, Mercury's orbit is closer to the Sun compared to the other planets listed.

As Mercury orbits the Sun, its path occasionally brings it closer to Earth when both planets align in their respective orbits. This phenomenon is known as a close approach or inferior conjunction. During this alignment, Mercury appears closer to Earth in the night sky, making it the planet that would make the closest approach to Earth among the given options.

Hence, the correct option is option A.

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Answer:

14.53ML

Explanation:

V1=218

V2=?

P2=15p1

USING BOYLE'S LAW

P1V1=P2V2

V2=P1V1/P2=P1(218ML)/15P1

=14.53ML

Answer:

17 electrons. On the right, the chloride ion has 18 electrons and has a 1− charge.

Explanation:

Inside the balloon, the gas particles collide with the balloon's inner walls. ... As the molecules heat up, they move faster and strike the inside wall of the balloon harder. This increased motion of the gas particles increases the force on an area of the balloon, producing a rise in the pressure.

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Answer:

High temperature increases the number of high energy collisions

Explanation:

Increasing the temperature a reaction takes place at increases the rate of reaction. At higher temperatures, particles can collide more often and with more energy, which makes the reaction take place more quickly.

Answer:

The correct answer is :

         a silver nitrate solution (AgNO3) is mixed with a solution of magnesium bromide (MgBr2). The balanced reaction would be: 2 AgNO3(aq) + MgBr2 --> 2 AgBr + Mg(NO3)2

the last one

Answer:

Activator effects a mixture if you put to much of the activator your using into a product or thing you are using.

Explanation:

For ex.

If you poor to much activator into slime it will make the slime hard and very wet it will ruin your slime completely so you will have to do it just right but start off pouring it slowly and mix and then more if it needs more.

Answer:

bismuth

Explanation:

i think if not i am so sorry

Answer:30.573 Billion atoms are in one gram

Explanation:

Answer:

506.0 g sodium and 778.8 g chlorine gas

Explanation:

The elements from which sodium chloride (NaCl) is composed are sodium (Na) and chlorine (Cl). Thus, the chemical equation for the production of sodium chloride (NaCl) from sodium (Na) and chlorine gas (Cl₂) is the following:

2Na(s) + Cl₂(g) → 2NaCl(s)

According to the balanced equation, 2 moles of NaCl are produced from 2 moles of Na(s) and 1 mol of Cl₂. To produce 22.0 mol of NaCl, we need:

22.0 mol NaCl x 2 mol Na(s)/2 mol NaCl = 22.0 mol Na(s)

22.0 mol NaCl x 1 mol Cl₂/2 mol NaCl = 11.0 mol Cl₂

Now, we convert the moles of each reactant to grams with the molar mass (MM) of the compound:

MM(Na) = 23 g/mol

22.0 mol Na x 23 g/mol = 506.0 g Na(s)

MM(Cl₂) = 35.4 g/mol x 2 = 70.8 g/mol

11.0 mol Cl₂ x 70.8 g/mol = 778.8 g Cl₂

Therefore, it is required a mass of 506.0 grams of Na(s) and a mass of 778.8 grams of Cl₂ to produce 22.0 mol of NaCl.

Explanation:

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Answer:

160 g

Explanation:

1 mole of oxygen atom = 16 g

Number of moles of oxygen given = 5 mole

Molecular weight of oxygen molecule = 32 g/ mole

Weight of oxygen in gram = 5 mol x 32 g/mol= 160 g

Therefore, 160 g of oxygen is present in 5 moles.

Answer:

The pH of the pure water is not always neutral but actually sometimes it can be slightly acidic but not of the same extent or value as HCl obviously. However ,it is enough to result to a color change in the presence of phenolphthalein.

Explanation:

I will try to be brief and spare the boring details .Basically ,this is caused by the reaction of water and CO2 that is naturally present in the atmosphere to produce a weak acid known as carbonic acid.

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ig The right answer is -Give the reaction more time.

Answer:

Death Valley in California U.S. is the hottest place in the world

The equation that correctly represents the dissociation of a strong acid in water is as follows: HCl → H+ + Cl−

Acid dissociation is the process by which an acid breaks up into it's constituent ions in an aqueous solution.

Acids are known to contain hydrogen ions (H+), hence, dissociate into H+ and an anion.

A strong acid like HCl dissociates completely in an aqueous solution while a weak acid does not dissociate completely.

According to this question, hydrogen chloride (HCl) is said to dissociate into hydrogen ion (H+) and chloride (Cl-) according to the following expression:

HCl → H+ + Cl−

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Answer:

In a chemical reaction, reactants that are not used up when the reaction is finished are called excess reagents. The reagent that is completely used up or reacted is called the limiting reagent, because its quantity limits the amount of products formed.

Explanation:

Answer:

24.6 years

Explanation:

Applying,

A = (A')[tex]2^{a/n}[/tex]..................... Equation 1

Where A = Original Tritium content in the wine, A' = Tritium content in the wine after decay, a = age of the old bottle, n = half life of Tritium

From the question,

Let A = X, therefore, A' = 0.25X

Given: n = 12.3 years

Substitute these values into equation 1

X = 0.25X([tex]2^{a/n}[/tex])

1 = 0.25×([tex]2^{a/12.3}[/tex])

1/0.25 =

4 = [tex]2^{a/12.3}[/tex]

[tex]2^{a/12.3}[/tex] = 2²

Equation the base,

a/12.3 = 2

a = 12.3×2

a = 24.6 years

Answer:

Sodium bicarbonate.

Explanation:

The gas produced during the mixing of bath bombs in water is Sodium bicarbonate. If the reaction is with citric acid then Sodium citrate can be produced. They are weak acid with bicarbonate base. These bath bombs can be a mixture of wet and dry substances and any shape can be mold.

Explanation: A river drainage basin is an area drained by a river and all of its tributaries. A river basin is made up of many different watersheds. A watershed is a small version of a river basin. Every stream and tributary has its own watershed, which drains to a larger stream or wetland.

The component of a river system is made of stream and small rivers that feed into a large river is tributaries. The component of a river system also called a drainage system is watersheds. The component of a river system is a ridge between water flowing in two directions is divided.

Tributaries are the small rivers or streams that are made from the big or main river.

Watershed is the place where the rainwater from all river lines come to a point.

Thus, the correct options are tributaries, watersheds, and divided.

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Answer:

A. transport

Explanation:

yan po sana makatulong

Answer:

A

Explanation:

Definitely not in the cell theory