calculate the energy needed to change 12g of ice at -20°C to liquid water at 0°C.

Answer:

The molar volume increases

Explanation:

By the Law of Charles-Gay Lussac (for ideal gases) which can be applied to a real gas, we can say that when a fixed mass of gas is heated, at constant pressure, its volume increases.

Law of Charles-Gay Lussac says:

V(Volume)= K(proporcionality constant)* T(Temperature)

or

Initial Volume/Inicial Temperature=Final Volume/Final Temperature

You can calculate the Final Volume.

This is because the temperature increases the energy of the molecules and also their speed, therefore the volume increases.

For example, if two moles of a gas have a constant pressure, as their temperature increases, their volume will also do so.

Something that is invisible that you can not see.

What are the magic numbers?

The magic numbers are 3, 6, and 9.

Answer:

C. Runoff from heavy rainfall forms narrow, shallow channels.

Explanation:

Erosion is the gradual washing away of the top layer of the soil or earth on which plant grows. There are three main types of erosion which are:

1. Sheet erosion

2. Gully erosion

3. Rill erosion

Rill erosion occurs when a soil layer is gradually being washed away by narrow stream channels called streamlets on the surface. After a heavy downpour, the streamlets facilitates the movement of water on the ground surface and in turn, earth materials are worn away.

When these streamlets becomes deeper, they form gullies. Gullies results into gully erosion.

When runoff removes soil and loose sediment in thin layers it is called sheet erosion.

Answer:D. It impacts a much larger area and obtains less oil than drilling.

Explanation:

Oil extraction from tar sands is environmentally detrimental as it removes biological communities, creates large open pits, and yields less oil for a greater impacted area compared to traditional drilling.

The drawback of oil extraction from tar sands is that it has significant environmental impacts. Unlike traditional oil drilling, which typically occurs in more discrete locations, tar sands require surface mining, which involves removing large areas of land, including any biological communities that reside in that area. This process creates a deep, open pit. Additionally, the process impacts a much larger area while yielding a relatively smaller amount of oil compared to conventional drilling methods. One of the environmental impacts includes the release of carbon dioxide, methane, and other air pollutants that contribute to atmospheric deterioration and climate change.

Answer:

Concentration of the acid = 1.05M

Explanation:

Given parameters:

Volume of acid = 14.0mL = 0.014L

Volume of base = 28.23mL = 0.02823L

Concentration of the base = 0.521M

Unkown:

Concentration of acid = ?

The reaction equation is given below:

          CH₃COOH + NaOH → CH₃COONa + H₂O

To obtain the unknown concentration of the acid used in the reaction, we simply work from the known parameters of the given base.

Procedure:

       Number of moles of base = concentration of base x volume

      Number of moles of base = 0.521 x 0.02823 = 0.0147mol

      1mole of the base neutralize on mole of acid,

    Therefore, 0.0147mol of the acid would be neutralized by the base.

To find the concentration of the acetic acid,

Concentration of acid = [tex]\frac{Number of moles of acid}{Volume of acid}[/tex]

Concentration of acid = [tex]\frac{0.0147}{0.014}[/tex]

Concentration of the acid = 1.05M

Answer:  1.05M

Explanation: took usatestprep test

Answer:

wind i think

Explanation:

Answer:

Hello! Your answer is Plants.

Answer:

change in volume

Explanation:

Chemical change is a type of change in which new substances are formed. There are various signs that indicate the occurence of a chemical change.

They include;

Therefore, in this case, change in volume is not an indicator that a chemical change has occurred.

Answer:

Change in Volume

Explanation:

Got it right on Odessyware ;) Have a Nice Day!!!!!

Answer:

Two half lives.

Explanation:

It is known that the decay of isotopes and radioactive material obeys first order kinetics.

Also, it is clear that in first order decay the half-life time is independent of the initial concentration.

That means for a sample 100% to decay to 50 % it will take one half-life, and to decay the remaining 50% to 25% it will take another half-life.

So, for a sample has 25% parent and 75% daughter it will have two half-lives.

If you are trying to observe a cell wall, you should look at a plant cell. There are only two different types of cells, which are plant and animal cells. The plant cell is the only one which contains a cell wall. Animal cells actually only have a cell membrane.

Cell walls, commonly found in plant or bacterial cells, have distinct structures based on the type of organism. Plant cell walls consist of cellulose, providing rigidity and structure, while bacterial cell walls contain peptidoglycan for protection and shape. Unlike these, animal cells do not have a cell wall.

If you wanted to look at a cell wall, the most common types you would observe would be those of plants or bacteria, as they are widely studied in biology. Plant cell walls are primarily made up of cellulose, giving them rigid structure for support, whereas bacterial cell walls are mainly composed of peptidoglycan, which provides protection against environmental stressors.

When observing a plant cell wall under a microscope, what you are seeing is a rigid layer outside the cell membrane that provides structure and support. For bacteria, the cell wall is a protective layer outside the cell membrane, which protects the bacterium and gives it shape.

In contrast, animal cells do not have a cell wall, but a cell membrane instead, which provides a flexible structure. It's essential to remember that cell walls vary significantly in composition and structure among different groups of organisms.

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answer is B

because both sides have equal numbers of atomos

Answer:

2400 mL

Explanation:

[tex]Ca + 2HCl \implies CaCl_2 + H_2[/tex]

According to this equation, the stoichiometric ratio between [tex]Ca[/tex] and [tex]HCl[/tex] for the complete reaction is 1:2.

We know that the number of moles of [tex]Ca[/tex] can be calculated using the mole formula. (number of moles = mass / molar mass)

Moles of Calcium = [tex]\frac{60}{40}[/tex] = 1.5 mol

So the moles of [tex]HCl[/tex] = [tex]1.5 \times 2[/tex] = 3.0 mol

Volume of HCl solution = Moles of HCl/ concentration of HCl

Volume of HCl solution = [tex]\frac{3}{1.25}[/tex] = 2400 mL

Answer:

Explanation:

Parameter given:

Volume of gas in the container = 22.4L

Pressure on the gas = 1.0atm

Temperature of the gas = 0.0°C

Problem 1

Coverting 0.0°C to Kelvin:

In order to convert 0.0°C to Kelvin, we apply the formula:

              K = T(°C) + 273

Where T is the temperature in °C and K is the unknown temperature in Kelvin:

               K = 0.0 + 273 = 273K

Problem 2

The combined gas law is also known as the general gas law. It is expressed as:

                   [tex]\frac{P_{1}V_{1}  }{T_{1} }  = \frac{P_{2}V_{2}  }{T_{2} }[/tex]

The expression combines both Boyle's law and Charle's Law.

Problem 3

Parameters given:

Volume of gas in the container V₁ = 22.4L

Pressure on the gas P₁ = 1.0atm

Temperature = 273K

P₂ = 1.50atm

Unknown: The final volume, V₂ = ?

Solution

From the given problem, we know that the temperature is constant. We apply Boyle's law. Boyle's law states that "The volume of a fixed mass of gas varies inversely a the pressure changes if the temperature is constant".

It is expressed as P₁V₁ = P₂V₂

The unknown parameter is V₂, we make it the subject of the expression:

                    V₂ =[tex]\frac{P_{1}V_{1}  }{P_{2} }[/tex]

                     V₂ = [tex]\frac{1  x 22.4}{1.5}[/tex]

                     V₂ = 15L

Problem 4

The unknown here is the new volume V₂ at constant pressure.

Given parameters:

Volume of gas in the container V₁ = 22.4L

Pressure on the gas P is constant

Intial Temperature T₁ = 273K

Final Temperature T₂ = 100°C , converting to K gives, K = 100 + 273 = 373K

From the given parameters, the unknown and the conditions guiding the equation, we apply Charle's law. Charle's law states that "The volume of a fixed mass of gas is directly proportional to its absolute temperature provided pressure is constant".

                 it is expressed as: [tex]\frac{V_{1} }{T_{1} }  = \frac{V_{2} }{T_{2} }[/tex]

We then express the unknown V₂ as the subject of the formula:

                       V₂ = [tex]\frac{V_{1} T_{2} }{T_{1} }[/tex]

                       V₂ = [tex]\frac{22.4 x 373}{273}[/tex]

                        V₂ = 30.6L

Answer:add the picture and i can tell you

Raising the temperature and change the pressure.

Answer:

24 atoms

Explanation:

The formula of the compound is C₇H₁₆O

The number of atoms that makes up one molecule of this compound are:

7 carbon atoms

16 hydrogen atoms

1 oxygen atom

The total number of atoms = 7+16+1 = 24 atoms

Answer:

The second step would be for formation of solute-solvent intermolecular bonds. Forming bonds always releases energy this would be an exothermic process

Explanation:

Answer:

There are three steps in solvation: the breaking of bonds between solute molecules, the breaking of intermolecular attractions between solvent molecules, and the formation of new solute-solvent attractive bonds. Energy is absorbed during the first two steps, and it is released during the last step.

Hope that Helps!!!

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Answer:

= 24 square units

Explanation:

The area of a rhombus is given by the formula;

Area = pq/2

Where p and q are the diagonals of the rhombus.

In this case; p = 6 and q = 8

Therefore;

Area = (6×8)/2

        = 24 square units

Answer:

B

Explanation:

1. Metamorphic rocks form from heat and pressure changing the original or parent rock into a completely new rock.

2.There are two basic types.

Intrusive igneous rocks crystallize below Earth's surface, and the slow cooling that occurs there allows large crystals to form.

Extrusive igneous rocks erupt onto the surface, where they cool quickly to form small crystals. Some cool so quickly that they form an amorphous glass.

3. Erosion is the wearing away of the land by forces such as water, wind, and ice. Erosion has helped to form many interesting features of the Earth's surface including mountain peaks, valleys, and coastlines. There are many different forces in nature that cause erosion.

4. • Frost and Salt Wedging. One of the more common forms of mechanical weathering is frost wedging. ...

• Unloading and Exfoliation. ...

• Water and Wind Abrasion. ...

5. Plucking, also referred to as quarrying, is a glacial phenomenon that is responsible for the erosion and transportation of individual pieces of bedrock, especially large "joint blocks". This occurs in a type of glacier called a "valley glacier".

6. Rusting, a well known example of corrosion, is the breakdown of the metal iron. The reactants of this chemical reaction are iron, water, and oxygen, and the product is hydrated iron oxide, better known as rust. Rust, unlike iron, is crumbly, orange, and pretty much useless for building things.

7. rainfall made sufficiently acidic by atmospheric pollution that it causes environmental harm, typically to forests and lakes. The main cause is the industrial burning of coal and other fossil fuels, the waste gases from which contain sulfur and nitrogen oxides, which combine with atmospheric water to form acids.

8. Magma that cools quickly forms one kind of igneous rock, and magma that cools slowly ...

9. When magma rises from deep within the earth and explodes out of a volcano, it is called lava, and it cools quickly on the surface. Rock formed in this way is called extrusive igneous rock.

10. When water becomes saturated with dissolved minerals, particles can crystallize out of the water and form minerals. Chemical rocks form when minerals crystallize directly from water.

11. Sugar dissolves faster in hot water than it does in cold water because hot water has more energy than cold water. When water is heated, the molecules gain energy and, thus, move faster.

12. Gypsum and halite

13. the repeating pattern of a mineral's particles forms a solid called a crystal. A crystal has flat sides, called faces, that meet at sharp edges and corners. a mineral has a definite chemical composition or range of compositions.

I hope this is what you’re looking for if not I’m very sorry :/

The formation of rocks, types of weathering, and characteristics of minerals are explained in detail. For instance, metamorphic rocks are formed by heat and pressure, igneous rocks are divided into intrusive and extrusive, and mechanical weathering includes processes such as frost wedging and thermal expansion.

1. Metamorphic rock needs heat and pressure to form.

2. The two types of igneous rock are intrusive (plutonic) and extrusive (volcanic).

3. Water, wind, and ice are three things that erode rocks.

4. Three examples of mechanical weathering include frost wedging, thermal expansion, and abrasion.

5. Plucking is when a glacier picks up rocks in the lower side.

6. Rust is an iron oxide (a type of corrosion) that forms in the presence of oxygen and moisture.

7. Acid rain is precipitation that contains higher than normal amounts of sulfuric or nitric acids. It's typically from pollutant gases in the atmosphere.

8. Magma cools slowly below the Earth’s surface.

9. Lava cools quickly on the Earth’s surface.

10. When minerals crystallize from water solutions, the narrow channels form veins.

11. When the hot water cools crystals form.

12. Halite, a mineral form of salt, is often left behind by evaporation.

13. The repeating pattern in a mineral is called its crystal lattice.

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The answer is true

Sorry if I'm wrong; please answer my last question I don't have much time; thank you

The statement is true. Stoichiometry is indeed the study of the quantitative relationship between the amounts of reactants used and products formed in a chemical reaction. It utilizes the coefficients from the balanced chemical equation to understand these relationships.

The statement is true. The study of the quantitative relationship between the amount of reactants used and the amounts of products formed by a chemical reaction is indeed called stoichiometry. This concept underlies the understanding of the classification of the reaction.

Chemical stoichiometry describes the quantitative relationships between reactants and products in chemical reactions. Coefficients from the balanced chemical equation provide the relative numbers of these chemical species, thus allowing a quantitative assessment of the relationships between the amounts of substances consumed and produced by the reaction.

For example, when calculating the amount of product generated from a given amount of reactant, any other reactants required are assumed to be available in stoichiometric amounts (or greater). These coefficients are used to derive stoichiometric factors that subsequently may be used for computations relating reactant and product masses, molar amounts, and other quantitative properties.

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Answer:

3.676 L.

Explanation:

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R  is the general gas constant,

T is the temperature of the gas in K.

(V₁T₂) = (V₂T₁)

V₁ = 3.5 L, T₁ = 25°C + 273 = 298 K,

V₂ = ??? L, T₂ = 40°C + 273 = 313 K,

(V₁T₂) = (V₂T₁)

∴ V₂ = (V₁T₂)/(T₁) = (3.5 L)(313 K)/(298 K) = 3.676 L.

Answer:

3.68 on edge

Explanation:

Answer:

pulmonary vein

Explanation:

The pulmonary vein is the only vein in the body that carries oxygen rich blood.

Answer:

Q6. scientists can monitor volcanoes to estimate when they are likely to erupt. Scientists can use a variety of techniques to do this, such as: seismometers - used to measure earthquakes occurring near an eruption. tiltmeters and GPS satellites – these devices monitor any changes in landscape. These signs may include very small earthquakes beneath the volcano, slight inflation, or swelling, of the volcano and increased emission of heat and gas from vents on the volcano,

Q7 They may need to move or they may need to evacute because when a volcano erupts it kills people and animals and burns every thing in its way. one way a volcano can kill someone is the thick ash clouds which make it hard to see and survive through.

Explanation:

Answer:

-142 joules ( or -100 joules when accounting for significant figures)

Explanation:

q = m c delta T

q = (.71)(2)(20 - 120)

q = (.71)(2)(-100)

q = -142 joules

The specific heat of carbon is 0.71 J/g.°C then the amount of energy which is given off as a 2 gram piece of graphite cools from 120°C to 20°C is -142 Joules.

Amount of absorbed heat by any substance will be calculated by using the below equation:

Q = mcΔT, where

On putting all these values, we get

Q = (2)(0.71)(-100) = -142 J

Hence, -142 Joules is the value of given off energy.

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A chemical change means that a new substance was formed. Different from what it was before the change took place.

Flammability and decomposition are examples of chemical changes.  <<<This is chemical change. An example can be seen in fruit. When a cut apple stays to long in the open it turns brown. This is because it is oxidized. Even if the apple tastes the same on the molecular level it has changed

Chemical changes involve a rearrangement of atoms to form new substances.  <<< It states even in the definition of chemical change that a new substance has to be formed

Chemical changes can often be identified by the formation of a gas or a solid or the release of heat.  <<< In a chemical change something extra may be created. This is different from an ice cub melting (which would be physical change). Although it goes from solid to liquid it is still water, and there is no extra product

Nothing is altered at the molecular level during a chemical change. <<<This is false

Hope this helped!

Answer:

Tissues form organs, and organs form systems. Hope this helped!

Explanation:

The answer is A. 10.

Answer:

10

Explanation:

Answer: 18

Explanation:

Since there are 19 protons and 19 electrons, by losing one electron, potassium would then have 18 electrons. Hope this helps!

Answer:

The answer is B. to explore the Kupier Belt

Answer:

The correct answer is option B, that is, to explore the Kupier belt.

Explanation:

The MIRI or the Mid-Infrared Instrument possesses both a spectrograph and a camera, which observes light in the mid-infrared region of the electromagnetic spectrum, exhibiting the longer wavelengths that are generally not seen with the naked eyes.  

The MIRI encompasses the range of wavelength in between 5 to 28 microns. The sensitive detectors present in them permits to observe the newly developing stars, the redshifted light of far-off galaxies, and faintly visible comets and the objects present in the Kupier belt.  

Answer:

Ionic bonds are made by a transfer of electrons. Covalent bonds are made by sharing electrons.

Explanation:

For ionic bonds, use the group number to help you determine how many electrons an element can give or receive (Group 1 gives 1 electrons, group 2 gives 2 electrons, group 3A gives 3, group 5A receives 3, group 6A receives 2, and group 7A receives 1).

Covalent bonds have to be worked out using the total number of valence electrons and the octet rule.

The answer is in the photo.