How many moles of gas are contained in 890.0 mL at 21.0 °C and 750.0 mm Hg pressure?

Answer:

Acid

Explanation:

Vinegar is a dilute form of acetic acid, while HCl is hydrochloric acid and H2SO4 is sulfuric acid. All of these are acids. Hope this helps!

Answer:

acids

Explanation:

Answer: 4.5

Explanation:

Answer:The answer is B

Explanation:

There is less water lost due to evaporation and therefore more available to plants. Mulch and minimum tillage results in twice as much available water as does deep tillage. This is an immediate benefit. We are looking for future benefits: less runoff and erosion, more soil stays in place, the soil is more fertile, and farmers use less fossil fuels.

Answer:

both

convex lens

concave lens

both

Explanation:

Answer:

A concave lens is

✔ thinner

in the middle than at the edges, and causes light rays to

✔ diverge

.

A convex lens is

✔ thicker

in the middle than at the edges, and causes light rays to

✔ converge

.

Explanation:

Answer:

Covalent bond

Explanation:

Comets have very elliptical orbits, are usually found in the outer regions of the solar system, have irregular shapes, and exhibit a coma and tail when they approach the Sun.

Comets are celestial objects that have very elliptical orbits. Unlike planets, which have more circular orbits, comets follow a path that is elongated and elongated.

Comets are usually found in the outer regions of our solar system, beyond the orbit of Mars, in a region known as the Kuiper Belt or the Oort Cloud. These regions are located far away from the Sun, where the gravitational pull is weaker, allowing comets to maintain their elliptical orbits.

The irregular shape of comets is another characteristic feature. Unlike planets, which have a more spherical shape due to their strong gravitational force, comets have a more irregular shape. This is because comets are made up of a combination of ice, dust, rock, and other materials, which can cause them to have a lumpy or uneven appearance.

When a comet approaches the inner regions of the solar system, it can be observed as a bright coma or "head" surrounding a nucleus. The nucleus is the solid core of the comet, composed mainly of ice and rock. As the comet gets closer to the Sun, the heat causes the ice to vaporize, creating a glowing coma and often a tail that points away from the Sun.

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Answer:

22Mol

Explanation:

2Mg + O2 --> 2MgO

If 11 mols of O2 reacted with excess Mg with 22 MgO moles will be created

Answer: The answer is C

Explanation:

A bomb calorimeter has a separate chamber to hold substances and can even measure heat gain or loss for reactions that do not occur in water.

The third option is correct.

The following information should be considered:

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Answer:

Please Mark as Brainliest!!!!!!!!!!

Explanation:

Increasing pressure is causing a smaller change in gas volume. The closeness of particles of gas and their low speeds allow intermolecular forces to become important at certain pressured and temperature

Answer:

NH4+

Explanation:

A Lewis base is a substance with the ability to share or give pairs of electrons.

The NH4 + ammonium ion donates a proton, therefore the ammonium ion is a Lewis acid.

The species that cannot act as a Lewis base NH4+.

It refers to a substance like OH- ion where the pair should be donated of non-binding electrons. It should be treated as the electron-pair donor. Also, the one advantage is that it complements the reduction and oxidation of the reaction model. Moreover, it shows the capability for sharing or providing the pair of electrons. Also, NH4+ donated the portion so ammonium ion is a Lewis acid.

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Answer:

D.

Explanation:

Suspension : for example sand and water. You can separate it when it sits still.

The type of mixture is likely to separate if it is allowed to sit still is suspension. Therefore, option D is correct.

A heterogeneous mixture of a finely dispersed substance in a liquid is referred to as a suspension. Similar to how salt and water dissolve in one another, the solid is not dissolved in the liquid.

Examples of mixtures that are most frequently used are chalk and water, dirty water, flour and water, dust and air, fog, magnesium milk, etc.

Suspension parts can be divided into three categories: linkages, springs, and shock absorbers. The bars and brackets that support the wheels, springs, and shock absorbers are known as links. The car is padded by springs, which reduce shock loads caused by potholes and bumps in the road.

A fluid mixture that contains solid particles large enough for sedimentation is called a suspension.

Thus, option D is correct.

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Answer:yes

Explanation:Because yes

Answer:

C.

Explanation:

Answer:is 1.08 kg

Explanation:

Just got it wrong and it gave me the answer

47.5atm is the total pressure. The force delivered perpendicularly to an object's surface per unit area across how that force is dispersed is known as pressure

The force delivered perpendicularly to an object's surface per unit area across how that force is dispersed is known as pressure (symbol: p / P).445 Gauge pressure, sometimes written as gauge pressure, is the pressure in relation to the surrounding air pressure.

Pressure is expressed using a variety of units. Some of these come from dividing a unit of force by a unit of area; for instance, the SI unit of stress, the pascal (Pa), is equal to one newton each square metre (N/m2), and the conventional unit of pressure used by both the imperial while US customary systems is the pound-force according square inch of surface (psi, symbol lbf/in2).

Volume of gas = 47.5ML

P x V=51.3

P x  47.5=51.3

P=47.5atm

Therefore, 47.5atm is the total pressure.

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To find the mass of 4.50 moles of Ba(NO2)2, you calculate its molar mass using atomic masses and multiply by the number of moles. The result is 1176.03 grams for 4.50 moles of Ba(NO2)2.

To calculate the mass of 4.50 moles of Ba(NO2)2, you first need to find its molar mass by adding the atomic masses of barium (Ba), nitrogen (N), and oxygen (O) from the periodic table. The molar mass of Ba(NO2)2 is calculated as follows:

(1 mol Ba)(137.33 g/mol) + (2 mol N)(14.01 g/mol) + (4 mol O)(16.00 g/mol) = 261.34 g/mol

Then, you multiply the molar mass by the number of moles:

(4.50 moles) × (261.34 g/mol) = 1176.03 grams

Therefore, there are 1176.03 grams in 4.50 moles of Ba(NO2)2.

Answer

B. a fruit falling from a tree

Explanation:

Take, for example, an apple tree. ... The tree uses this energy to build leaves and branches and fruit. When an apple falls from the tree to the ground, its energy of position (stored as gravitational potential energy) is converted to kinetic energy, the energy of motion, as it falls.

The net ionic equation is:

[tex]\[ \text{OH}^- + \text{H}^+ \rightarrow \text{H}_2\text{O} \][/tex]

To determine the net ionic equation, we first need to write the balanced chemical equation and then identify the spectator ions.

The given chemical equation is:

[tex]\[ \text{Mg(OH)}_2 + 2 \text{HNO}_3 \rightarrow \text{Mg(NO}_3\text{)}_2 + 2 \text{H}_2\text{O} \][/tex]

To balance the equation:

[tex]\[ \text{Mg(OH)}_2 + 2 \text{HNO}_3 \rightarrow \text{Mg(NO}_3\text{)}_2 + 2 \text{H}_2\text{O} \][/tex]

In the balanced equation, all species are dissolved in water, so we can split them into ions to identify spectator ions.

1. Mg(OH)₂ dissociates into [tex]\( \text{Mg}^{2+} \) and \( 2\text{OH}^- \)[/tex]

2. HNO₃ dissociates into [tex]\( \text{H}^+ \) and \( \text{NO}_3^- \)[/tex]

3. Mg(NO₃)₂ dissociates into [tex]\( \text{Mg}^{2+} \) and \( 2\text{NO}_3^- \)[/tex]

4. H₂O does not dissociate significantly.

So, the net ionic equation is:

[tex]\[ \text{Mg}^{2+} + 2\text{OH}^- + 2\text{H}^+ + 2\text{NO}_3^- \rightarrow \text{Mg}^{2+} + 2\text{NO}_3^- + 2\text{H}_2\text{O} \][/tex]

Cancelling out the spectator ions ([tex]\( \text{Mg}^{2+} \) and \( \text{NO}_3^- \)[/tex]), we get:

[tex]\[ 2\text{OH}^- + 2\text{H}^+ \rightarrow 2\text{H}_2\text{O} \][/tex]

Therefore, the net ionic equation is:

[tex]\[ \text{OH}^- + \text{H}^+ \rightarrow \text{H}_2\text{O} \][/tex]

Answer : The temperature [tex]Cl_2[/tex] gas is, 153 K

Explanation :

Using ideal gas equation:

[tex]PV=nRT[/tex]

where,

P = Pressure of [tex]Cl_2[/tex] gas = 900 torr = 1.18 atm   (1 atm = 760 torr)

V = Volume of [tex]Cl_2[/tex] gas = 0.750 L

n = number of moles [tex]Cl_2[/tex] = 0.0705 mole

R = Gas constant = [tex]0.0821L.atm/mol.K[/tex]

T = Temperature of [tex]Cl_2[/tex] gas = ?

Putting values in above equation, we get:

[tex]1.18atm\times 0.750L=0.0705mole\times (0.0821L.atm/mol.K)\times T[/tex]

[tex]T=152.9K\approx 153K[/tex]

Therefore, the temperature [tex]Cl_2[/tex] gas is, 153 K

Answer:

?

Explanation:

Answer : the sky (teehee)

Answer:

I’m pretty sure its D. Sweating when you are hot

Answer:

Chemical change

Answer: 1) HI to increase

Explanation:

Any change in the equilibrium is studied on the basis of Le-Chatelier's principle.This principle states that if there is any change in the variables of the reaction, the equilibrium will shift in the direction to minimize the effect.

[tex]2HI(g)\rightleftharpoons H_2(g)+I_2(g)+energy[/tex]

As the given reaction is exothermic , on increasing the tempearture, the equilibrium will shift in the direction where decrease in tempearture is taking place.So, the equilibrium will shift in the left direction. i.e. towards reactants. Thus amount of [tex]HI[/tex] will increase.

When the temperature of the system increased so it leads the concentration to option 1. HI to increase.

It defines that if any change in the reaction variables so the equilibrium should be shifted in the direction so the impact should be minimized.

Since the given reaction is considered to be exothermic, so in the case when the temperature is increased so the equilibrium should be shifted in the direction that reduced the temperature.

Therefore, the equilibrium should be shifted in the left direction.

Hence the first option is correct.

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Answer:

False

Explanation:

Answer:

[tex]m_{Al} = 18.019\,g[/tex]

Explanation:

There is a heating process between an aluminium piece and water, which is described by the First Law of Thermodynamics:

[tex]Q_{Al} = - Q_{w}[/tex]

[tex]m_{Al}\cdot c_{Al}\cdot (T_{o,Al}-T) = m_{w}\cdot c_{w}\cdot (T-T_{o,w})[/tex]

The mass of the aluminium piece is therefore cleared and known variables are substituted:

[tex]m_{Al} = \frac{m_{w}\cdot c_{w}\cdot (T-T_{o,w})}{c_{Al}\cdot (T_{o,Al}-T)}[/tex]

[tex]m_{Al} = \frac{(100\,g)\cdot \left(4.184\,\frac{J}{g\cdot^{\circ}C} \right)\cdot (15^{\circ}C-10^{\circ}C)}{\left(0.900\,\frac{J}{g\cdot ^{\circ}C} \right)\cdot (144^{\circ}C-15^{\circ}C)}[/tex]

[tex]m_{Al} = 18.019\,g[/tex]

Answer:

The mass of copper that was heated is 30 g

Explanation:

The formula for the heat supplied, ΔH is;

ΔH = m·c·Δt

Where:

ΔH = Heat supplied = 480 J

m = Mass of the copper sample = Required

c = Specific heat capacity of copper = 0.4 J/(g·°C)

Δt = Change in temperature = T₂ - T₁ = 60° - 20° = 40°C

T₁ = Initial temperature = 20°C

T₂ = Final temperature = 60°C

Therefore, plugging the values, we have;

480 = m×0.4×40

m = 480/(0.4 × 40) = 30 g

The mass of copper that was heated = 30 g.

After volcanic eruption the new land will be populated with a large number of organisms called pioneer species. The process is called Primary succession.

The process in which a new land is created or exposed for the first time after volcanic eruption is defined as the primary succession. During this time the lava cools and produces new rocks.

After this first of all the lichens are found to attach themselves to rocks and the plant species which can grow without much soil can appear. Gradually the decomposition of all these plants helps in soil formation.

As a result more and more plants begin to colonize the area. So this land then becomes a fertile land with lot of nutrients and can lead to the formation of forest. Then after secondary succession occurs.

Thus in primary succession the newly formed land has been populated by many living organisms.

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Answer: The muscularis (muscularis externa)

Explanation: please brainliest

the muscle that helps with digestion is a smooth muscle called the tract

Answer: A. Physical features

Explanation:

A dichotomous key for identifying organisms primarily uses the physical features of the organisms. The user is required to accurately observe and describe these characteristics to correctly proceed in using the key.

When using a dichotomous key to identify organisms, we primarily look at the physical features of the organisms. A dichotomous key is a tool that allows the user to determine the identity of items in the natural world, such as trees, wildflowers, mammals, reptiles, rocks, and fish. The key presents a series of choices about the characteristics of the unknown organisms; these choices are based on the physical features. The user must accurately observe and describe the physical features in order to correctly proceed in using the key.

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Answer:

0.225M

Explanation:

Step 1:

Data obtained from the question. This includes:

Volume of the stock solution (V1) = 125mL

Molarity of the stock solution (M1) = 0.90 M

Volume of the diluted solution (V2) = 125 + 375 = 500mL

Molarity of the diluted solution (M2) =..?

Step 2:

Determination of the molarity of the diluted solution.

This is obtained by using the dilution formula as follow:

M1V1 = M2V2

0.9 x 125 = M2 x 500

Divide both side by 500

M2 = (0.9 x 125) /500

M2 = 0.225M

Therefore, the molarity of the diluted solution is 0.225M

Answer:

The molarity of the diluted solution of NaOH is 0.225 M NaOH

Explanation:

Here, we have, initial concentration of the solution = 0.90 M NaOH

Volume of initial solution = 125 mL

Volume of added water = 375 mL

Total volume of diluted solution = 375 mL + 125 mL = 500 mL

Number of moles in the diluted solution = 0.9 × 0.125 = 0.1125 moles of NaOH

Derived from the following relation;

0.9 M NaOH indicates that 1000 mL contains 0.9 moles of NaOH

Therefore, 1 mL contains 0.9/1000 moles of NaOH and 125 mL contains 0.9/1000×125 or 0.9 × 0.125 moles of NaOH

Therefore, the diluted 500 mL solution contains 0.1125 moles of NaOH. Therefore, 1000 mL of the diluted solution will contain [tex]1000 \times \frac{0.1125}{500} \ moles[/tex] of NaOH or 0.225 moles of NaOH

Hence the molarity of the diluted solution of NaOH, which is the number of moles per 1000 mL is 0.225 M.

Answer:

C is the answer

Explanation:

Heat energy is transformed into electrical energy.

Answer:

B. Electrical energy is transformed into light energy.