Takisha conducted an experiment to determine the effect of salt on the boiling point of water. She measured the boiling points of 100 ml of water with salt added in 5 g increments. As a control, she also recorded the temperature of water with no salt added. What is the purpose of this control?.

Energies of given waves exists:

6. 17.27 × [tex]10^{-20}[/tex]  J

7. 63.61 × [tex]10^{-23[/tex] J

8. 9.99 × [tex]10^{-24}[/tex] J

9. 41.5 × [tex]10^{-21}[/tex] J

10. 16.89 ×  [tex]10^{-19}[/tex] J

The energies of given waves exists:

6. 17.27 × [tex]10^{-20}[/tex]  J

7. 63.61 × [tex]10^{-23[/tex] J

8. 9.99 × [tex]10^{-24}[/tex] J

9. 41.5 × [tex]10^{-21}[/tex] J

10. 16.89 ×  [tex]10^{-19}[/tex] J

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            Precipitate definition (Entry 2 of 3) 1: a substance that has been physically or chemically isolated from a solution or suspension, typically in the form of an insoluble crystalline or amorphous solid. 2: a byproduct, outcome, or result of a procedure or action. adjective. precipitate.

Precipitation Illustration

        Silver chloride will solidify out of solution when silver nitrate and sodium chloride are combined in water. Silver chloride is the precipitate in this instance.

       Solids are created by the process of precipitation after two chemicals react. The downword () arrow symbol is used to represent the production of precipitate in this type of reaction.

      It happens between the reactant ions in the aqueous solutions that give rise to the material. Complete response: Precipitation includes the following: snow, sleet, hail, and rain.

       An excess of the light blue precipitate dissolves to create an inky transparent solution. A little amount of sodium hydroxide solution and subsequently an excessive amount are added to solution W. There develops an insoluble white precipitate.

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Answer:

Explanation:

Zn + S ---> ZnS

Mass of Zinc + Mass of Sulphur = Mass of Zinc sulfide ( Law of conservation)

Mass of zinc= 65.4g

Mass of Sulfur =  32.1g

Mass of Zinc Sulfide= (65.4 + 32.1)g

Mass of Zinc Sulfide = 97.5g

The equilibrium concentration [tex]k_{c}[/tex] = 0.57.

Equilibrium is when the rate of the forward reaction equals the rate of the reverse reaction. All reactant and product concentrations are constant at equilibrium.

Given reaction:

co(g) + [tex]H_{2}o[/tex] <--> [tex]co_{2}[/tex](g) + [tex]H_{2}[/tex](g)

co = 1 mole

[tex]H_{2}o[/tex] = 1 mole

[tex]H_{2}[/tex] = 0.43 mole

Each reactant is mixed in a 1 liter flask.

equilibrium concentration = ?

Equilibrium amount:

co = 1 - 0.43 = 0.57 mole

[tex]H_{2}o[/tex] = 1 - 0.43 = 0.57 mole

[tex]co_{2}[/tex] = 0 + 0.43 = 0.43 mole

[tex]H_{2}[/tex] = 0 + 0.43 = 0.43 mole

Then, equilibrium concentration

co = 0.57/1 liter = 0.57 mole

[tex]H_{2}o[/tex]  = 0.57/1 lite r= 0.57 mole

[tex]co_{2}[/tex] = 0.43/1 liter= 0.43 mole

[tex]H_{2}[/tex] = 0.57/1 liter = 0.57 mole

[tex]k_{c} = \frac{[H_{2} ][co_{2} ]}{[H_{2}0 ][co]}[/tex]

[tex]K_{c} = \frac{0.43.0.43}{0.57.0.57}[/tex]

[tex]k_{c}[/tex] = 0.57

Hence, The equilibrium concentration [tex]k_{c}[/tex] = 0.57.

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The amount of copper that would be deposited on the cathode during the process is 47.75 g.

The amount of copper (II) deposited is calculated as follows;

CuSO² ⇄ Cu²⁺  +  SO₄²⁻

Cu²⁺  +  2e⁻  → Cu

.

From the oxidation reaction above, we can infer that,

2F -----------> 64 g of copper (Cu)

where;

The quantity of charge passed through the solution of  copper (II) sulfate for four hours is calculated as follows;

Q = It

where;

Q = (5 A) x (4 hrs x 3600 s/hr)

Q = (5 A) x (14,400 s)

Q = 72,000 C

The amount of copper that will be deposited by this quantity of charge is calculated as follows;

96500 C --------> 64 g

72,000 C ---------> ?

= (72,000 X 64) / 96500

= 47.75 g

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The important discovery from Rutherford’s gold foil experiment was that the volume occupied by an atom is largely empty space.

An experiment can be described as a procedure carried out to support or refute a hypothesis, or determine the efficacy or likelihood of something previously untried.

Rutherford's model was the first to introduce the concept of an atomic nucleus. This novel idea accounted for the sparse distribution of electric charges that was revealed in Rutherford's famous gold foil experiment.

Rutherford in his experiment shot a beam of alpha particles at a sheet of gold foil, where some of these particles were deflected.

That accounted for the theory that the volume occupied by an atom is largely empty space.

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The molecular formula of the given is 0.519.

To calculate the molecular formula we need a simple formula,

molecular formula = divide the molecular mass / empirical formula

So, the known are

molecular mass = 62 g/mol

empirical formula = CH₃O

C = 38. 7%

H = 9. 7%

O =  51. 6%

empirical formula = 38. 7% + (9. 7% x 3) + 51. 6%

empirical formula = 119.4

Now, putting the values in formula

molecular formula = molecular mass / empirical formula

molecular formula = 62 g/mol / 119.4

molecular formula = 0.519

Hence, the molecular formula is 0.519.

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The change in the potential energy of the cars would be the same since they started moving from the same position.

The potential energy is the energy that is possessed by a body by virtue of its position. We know that when we move the object from one point to the other, the potential energy of the object would vary.

Now we have Lucia has two identical toy vehicles (purple and pink) that start on opposite sides of a center magnet that cannot move. She moves both vehicles one space closer to the center magnet. Let us note that the potential energy would begin to change as the cars begin to move from one point to another.

We have to note that the positions of the vehicles are the same and this would imply that the changes in the potential energy of the vehicles would be the same.

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Lithium Atom, Fluorine common ion, Magnesium Common ion, Oxide common ion are the ones that are larger in each of the choices as given.

Positively charged ions are known as cations. Negatively charged ions are further referred to as anions. A charged atom or molecule can be referred to as an ion.

A balanced atom will change into a positively charged cation if one or more of its electrons are lost. A balanced atom will change into a negatively charged anion if it gains one or more electrons.

In the formula for an ionic compound, the positive ion, known as a cation, is listed first, followed by the negative ion, known as an anion. The net charge or neutral electrical charge in a balanced formula is zero. A cation can be either positive or negative.

An anion contains more protons than electrons, while a cation has a net positive electrical charge. An anion has a greater number of electrons than protons and a net negative electrical charge.

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Almost all of an atom's mass is found in its nucleus, located in the center of the atom an atom's nucleus can contain two types of particles: protons and neutrons the nucleus of every atom contains one or more protons each proton has a positive electrical charge. In many atoms, the nucleus also contains neutrons a neutron has no electrical charge all the statements are true

Protons are positively charged, neutrons are uncharged and electrons are negatively charged the negative charge of one electron balances the positive charge of one proton and both protons and neutrons have a mass of 1, while electrons have almost no mass

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I just did it in IXL

When a screen is used to easily separate substances, what physical properties are being used then the size are used

A physical property is a characteristic of matter that is not associated with a change in its chemical composition and similar examples of physical properties include density, color, hardness, melting and boiling points, and electrical conductivity and the physical property that is in use when substances are separated using a screen is differences in particle size of the substances and this is the separation method

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Answer:

d

Explanation:

The correct Greek letter used for the carbon adjacent to carboxyl group is alpha (α).

What is carboxylic acid?

Any of a group of organic compounds known as carboxylic acids in which a carbon (C) atom forms a double bond with an oxygen (O) atom and a single bond with a hydroxyl group (OH). The carbon atom is connected to a hydrogen (H) atom or another univalent combining group by a fourth bond. The carbonyl group (C=O) and hydroxyl group are what give the carboxyl (COOH) group its name. The acidity of the carboxylic acids is one‘s primary chemical characteristic. They are typically weaker than the well-known mineral acids but generally more acidic than other organic compounds with hydroxyl groups (e.g., hydrochloric acid, HCl, sulfuric acid, H2SO4, etc.).

Greek letter used for the carbon adjacent to the carboxyl group is Alpha.

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Fe(CO)₅ is the limiting reactant given the provided statement since it has the lowest ratio.

The quantity of product that can be created is constrained by the reagent that is used first in a chemical reaction, also referred to as the limiting reactant (or limiting reagent).

Calculating the moles supplied/moles stoich ratio will reveal the limiting reactant, which is the one with the lowest value.

Fe(CO)₅ ratio = [5 g / 195.9 g/mol] / 1

Fe(CO)⁵ ratio = 0.025

PF3 ratio = [8 g / 87.97 g/mol] / 2

PF3 ratio = 0.045

H2 ratio = [6 g / 2 g/mol] / 1

H2 ratio = 3

We can see that Fe(CO)5 has the lowest ratio, so it is the limiting reactant.

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This tells you that the reaction will always consume 2 times more moles of lithium hydroxide than moles of sulfuric acid.

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Based on the graph of mass against volume;

1. the mass of a sample of galena would be 22.5 g if it has a volume of 3.0 cm³

2. the volume of a sample of galena would be 4.00 cm³ if it has a mass of 30.0 g

3. the relationship between the mass and volume as shown by the graph is that the mass of the galena sample is directly proportional to the volume of the sample.

4. the density of Sample 2 compared to that of Sample 4 is the same.

5. the density of the largest sample (5) compare to the smallest sample (1) is the same.

6. the effect of sample size on the density of a material is that the density of a sample is independent of the mass.

The mass and the volume of a sample of known density are directly proportional.

This means that the mass increases with the volume and vice versa.

Considering the given graph, the density of the galena sample is constant ad the volume increases as the mass increases.

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Answer:

mass

Explanation:

Protons and neutrons contribute mass to the atom.

Petroleum is a fossil fuel that was formed from sediments of plants and animals left over millions of years through the transformation of dead organisms that are buried under the sea and seafloors such as algae, plants, and bacteria, that experienced high temperature and pressure when trapped inside rock formations such as the sedimentary rocks.

Petroleum, also referred to as crude oil, is a naturally occurring liquid found beneath the earth’s surface which can be refined into fuel.  

Petroleum is a  fossil fuel that is created by the decomposition of organic matter over time and used as fuel to power vehicles, heating units, and machines, and can be converted into plastics.

Petroleum is mostly recovered through oil drilling and then refined and separated into different types of fuels. Petroleum contains hydrocarbons of different molecular weights. The petroleum has a property of the denser the petroleum the more difficult it is to process and the less valuable it is.

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The object's potential energy is highest at the height from which it is dropped. Its potential energy diminishes while its kinetic energy grows as it descends.

PE = 1 kg

g = 9.8 m/s2

h = 100 m PE =? J m

PE = 1 kg 9.8 m/s2 = 980 kg•m2/s2 = 980 J

In contrast to potential energy, an object's kinetic energy is related to other fixed and moving objects in its immediate environment. For example, if the object is positioned at a larger height, its kinetic energy will be greater.

According to its mass and beginning height, an item carried at a specific height above the ground has an initial potential energy (PE). When the thing is released, the velocity of the object rises as it falls. This increase in velocity increases the object's kinetic energy (KE).

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The sun provides energy to the leaves through photosynthesis. It converts the sun's rays into sugar and provides energy to the leaves.

When sunlight hits the leaves packets of light called photons bounce off the chlorophyll molecules. In doing so it knocks electrons out of orbits around the magnesium atom. Electrons have a negative charge, so the loss of an electron produces a positively charged magnesium ion. Plants absorb energy from the sun through a process called photosynthesis to power processes necessary for survival.

Harvest the sun's energy with the help of chlorophyll in the cells of the leaves. Chlorophyll captures and packs energy from the sun's light in a process called photosynthesis. Leaves usually have a large surface area to maximize sunlight. Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to produce oxygen and energy in the form of sugars. The more light a plant is exposed to, the less chlorophyll it synthesizes.

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Molar mass of the unknown gas= 39.09 g / mol

T= TIME

MW= MOLAR MASS

MW H₂ = 2

now, Apply graham law--

graham law states that rate of effusion of a gas is inversely proportional to square root of the molar mass of its particle.

Rate1/rate2 = √(MW2/MW1)

T2/T1 =√(MW2/MW1)           (BECAUSE, VOLUME EQUAL)

(10.7/2.42)²= MW2/2

MW2=molar mass of the unknown gas = 2α×(10.7/2.42)²

=39.09 g / mol

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Answer:

everything in OUR solar system revolves around the sun

Explanation:

the sun is the only star in our solar systen

Answer: Everything in our solar system revolves around the sun

Explanation: everything in our milky way revolves around the sun but in other solar systems it does not because that is a completely different solar system with most likely a different sun so yes in OUR solar system

The correct number of significant digits, the product of 0.01200 and 45.9 is the right answer 0.5508.

The above number has only one significant digit because if there is a zero before the decimal point only the non-zero digits after the decimal point are significant digits. Three rules are used to determine the number of significant digits Non-zero numbers are always valid. All zeros between two significant digits are valid. Only trailing zeros or trailing zeros in the fractional part are significant.

Rounds a number to three significant digits the same way it rounds to 3 decimal places. Count up to 3 digits from the first non-zero digit. Then round off the last digit. Pad the remaining digits to the right of the decimal point with zeros. All zeros between two non-zero digits are valid. For example, 10,007 has 5 significant digits. If the zeros are both to the right of the decimal point and to the left of the non-zero digits, they don't matter.

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As the values of these constants become closer to zero, the ideal gas law PV=nRT and the van der Waals equation of state get closer. For the intermolecular forces, the constant a serves as a correction. The value of constant b, which corrects for finite molecular size, is the volume of one mole of atoms or molecules.

The perfect gas equation, P = RT, is the most often used thermal equation of state. The fact that all gases can be liquefied serves as the finest illustration of its limitation for genuine fluids. The fluid's critical point is determined by the greatest temperature at which liquid and vapour may coexist.

The state equation for a van der Waal's gas is (P+n2aV2)(Vnb)=nRT. U=CTn2aV describes the internal energy's variation.

Since the pressure is predicted to be a linear function of temperature by the van der Waals equation, (CV / V)T = 0 and CV is independent of gas volume. Because the van der Waals gas acts like an ideal gas at very high volumes, its heat capacity is equivalent to that of an ideal gas.

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Potassium is an element in group 1 of the periodic table and so it forms  positive ions

A Potassium atom acquires a charge of +1 to enter its noble gas electron configuration that's why it is found in group 1 of the periodic table of the elements and it is called as K⁺ ion and  K⁺ ions have 1 less electron than K atoms

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Ответ:ответ

.Объяснение:т.к вода это одно вещество и лёд тоже делают из

The balanced reaction equations for the described reactions are given below. The first reaction is a combination of a double displacement and a decomposition reaction, the second one represents single displacement reactions, and the third one is multiple double displacements.

The balanced reaction equation (including a double displacement and a decomposition) between aqueous sodium hydrogen carbonate and aqueous acetic acid (resulting in the formation of liquid water, gaseous carbon dioxide, and aqueous sodium acetate) looks like this:

NaHCO₃(aq) + AcOH(aq) → CO₂(g) + H₂O(l) + NaOAc(aq)

The balanced reaction equation between aluminum metal and iron(III) oxide (resulting in the formation of iron metal and aluminum oxide) looks like this:

2Al(s) + Fe₂O₃(s) → 2Fe(s) + Al₂O₃(s)

The balanced reaction equation between solid potassium oxide with aqueous magnesium chloride (resulting in the formation of solid magnesium hydroxide and aqueous potassium chloride) looks like this:

K₂O(s) + H₂O(l) + MgCl₂(aq) → Mg(OH)₂(s) + 2KCl(aq)

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The interatomic bond or interaction defines the real attraction or repulsion between the molecules in whatever state may the solid, liquid, or gas.

What is temperature and molecular interaction?

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