Which of the following is an example of a longitudinal wave

Answer:

Formaldehyde is highly soluble in water.

Explanation:

Formaldehyde is the simplest of the aldehydes (R−CHO) it is an organic compound which occurs naturally with the formula H−CHO. . The IUPAC name of formaldehyde is methanal.

Formaldehyde  at room temperature is a colorless gas and the liquid is invisible or like white-water. Formaldehyde has an irritating and very pungent like odour. Formaldehyde is very soluble in water.

Now according to Henry's constant law (3 × 10-5 kPa·m3/mol) Formaldehyde will be very unlikely to volatilize from water.and hence, Formaldehyde is considered to be highly soluble in water.

Answer:

c

Explanation:

Answer:

The correct option is B) Decomposition.

Explanation:

In a decomposition reaction, a single substance decomposes, producing two or more different substances. That is, two or more substances are formed in this type of reactions from a compound. The atoms that form a compound are separated to give the products according to the formula:

AB → A + B

There are 3 types of decomposition reactions, depending on the external factor that can promote the decomposition of the molecule into simpler substances:

In this case a decomposition reaction occurs, where C₁₆H₁₇NaO₁₄ decomposes to give carbon dioxide (CO₂) and C₂H₃NaO₃.

Another option may have been chemical synthesis, which involves the combination of two or more substances and results in the formation of a substance.  But in this case you can see that the water does not react (it appears in the reagents and in the products). This means that it helps with the decomposition mentioned previously.

So, the correct option is B) Decomposition.

Answer:True?!

Explanation:

Can someone answer this please I will fix it tomorrow if i remember

Answer:

true

Explanation:

Answer:

Number of moles = 1.97 mol

Explanation:

Given data;

Number of moles of I₂ = ?

Mass = 500.0 g

Solution:

Number of moles = mass/ molar mass

Molar mass of  I₂ = 253.8 g/mol

Number of moles = 500 g / 253.8 g/mol

Number of moles = 1.97 mol

Answer:

999 kJ

Explanation:

Given are two reactions with enthalpies Δ[tex]H_1=-2,439\ kJ[/tex] and Δ[tex]H_2=3,438\ kJ[/tex]

We know enthalpy is an additive property.

Thus the overall chemical equation can be obtained from adding both the two elementary equations.

Therefore the overall enthalpy is the summation of enthalphy change in each equation.

Δ[tex]H_{overall} =[/tex]Δ[tex]H_1+[/tex]Δ[tex]H_2[/tex]

Δ[tex]H_{overall}[/tex] [tex]=-2,439+3,438=999\ kJ[/tex]

Therefore the overall enthalpy is 999 kJ.

Answer: D

Explanation:

just took it

Answer:

Sunita will change the variable water.

Explanation:

Sunita have to change the variable water to perform this experiment of diffusion.This is because she is going to predict that more water she uses longer the time needed for the dye to spread through it.

 As a result she is increasing the amount of water to observe the effect of diffusible substance on diffusion with time.

Answer:

Explanation:

Chemical equation:

HCl + Fe₂O₃  → FeCl₃ + H₂O

Balanced Chemical equation:

6HCl (aq)+ Fe₂O₃(s)  → 2FeCl₃(aq) + 3H₂O(l)

Ionic equation:

6H⁺(aq) + 6Cl⁻(aq) + 2Fe⁺³(aq) + 3O²⁻(aq) → 2Fe⁺³(aq) + 6Cl⁻(aq) + 3H₂O(l)

Net ionic equation:

6H⁺(aq) + 3O²⁻(aq) →  3H₂O(l)

The Cl⁻(aq) and Fe⁺³(aq) are spectator ions that's why these are not written in net ionic equation. The water can not be splitted into ions because it is present in liquid form.

Spectator ions:

These ions are same in both side of chemical reaction. These ions are cancel out. Their presence can not effect the equilibrium of reaction that's why these ions are omitted in net ionic equation.  

Answer:

This is called a "cell wall'.

Explanation:

Answer: cell wall

Explanation:

Answer:Convection powers the motion of the molten outer core. The hot liquid from deep inside rises toward the cooler top of the core. The movement transfers heat upward and causes a convective flow. Cooler liquid from near the core-mantle boundary sinks downward and thus also helps to power the convection.the outer core

Explanation:

Answer:

its b

Explanation:

i took the test :)

Answer:

The solubility of a substance can be increased by increasing the amount of solvent in a solution.

Explanation:

Two ways by which the rate of dissolving for substance can be increased.

1 By increasing the temperature of the solution: Increase in temperature will in turn increase the entropy or disorder or randomness of the solute molecules in a solution thus increasing the rate of dissolving the substance in that solution.

2 By increasing the volume of the solution : increase in the volume of the solution by adding more solvent can also increase the dissolving rate of a specific substance in a solution.

Answer:

1. Robert Bunsen hence being called the bunsen burner. 2. William Kirchhoff

Explanation:

Answer:

The charges repel each other

Explanation:

Elements in the same family have similar properties because they share the same number and distribution of valence electrons, leading to similar chemical behaviors. Group patterns like the alkali metals in Group 1A with one valence electron contribute to these predictable reactivity patterns. Trends, such as increasing metallic character down a group, are also observed.

Elements in the same family or group of the periodic table generally have similar properties because they have the same number and distribution of electrons in their valence shells. This similarity in electron configuration explains their comparable chemical behaviors. For instance, all elements in Group 1A have one valence electron, which leads to common reactivity patterns and they are known as the alkali metals. As we progress along a group, there are also trends, such as an increase in metallic character from nonmetals like oxygen to metals like polonium.

In the 19th century discoveries, similar compounds formed by the reactions of elements such as lithium, sodium, and potassium with other elements underscored the pattern of similar chemical properties within a group. The figure from the provided reference indicates that within a group, elements have the same s and p valence electron configurations, which play a crucial role in their reactions and interactions.

Therefore, the periodic table is deliberately structured to group elements with similar properties, following the patterns of electron configurations, specifically within their valence shells, resulting in the elements' predictable chemical behavior. This order mirrors the sequential filling of electron subshells, ensuring that elements in a family react similarly in chemical reactions.

Answer:

a: 1st paragraph from the left side indicates Newton's first law.

b:, 2nd paragraph from the left side indicates Newton's third law.

c: 1st paragraph from right side indicates Newton's first law.

d: 2nd paragraph from right side indicates Newton's second law.

Explanation:

a. True. Water exists as a liquid between 0 and 100 degrees Celsius.

Freezing Point: Water freezes at 0 degrees Celsius (32 degrees Fahrenheit). This is the temperature at which water starts to change from a liquid to a solid (ice) under normal atmospheric pressure.

Boiling Point: Boiling point of water is 100 degrees Celsius (212 degrees Fahrenheit). This is the temperature at which water changes from a liquid to a gas (steam) under normal atmospheric pressure.

Answer: It would be decomposition :)

Answer:

MnSO₄ → MnO+SO₃ is a decomposition reaction.

Explanation:

In a decomposition reaction, a single substance breaks down or breaks down, producing two or more different substances. In other words, decomposition reactions are those that form two or more substances from a compound. In this reaction the atoms that form a compound are separated to give the products according to the formula:

AB → A + B

This type of reactions can occur spontaneously or caused by certain external factors, such as heat, that promote the breakdown of the molecule into simpler substances.

There are 3 types of decomposition reactions, depending on the external factor that causes the reaction:

Then MnSO₄ → MnO+SO₃ is a decomposition reaction.

Sodium Chloride (NaCl) can be classified as a salt

Explanation:

Sodium chloride is an "ionic compound" is known as salt. The ratio in which the  sodium(Na) and chloride(Cl) present in sodium chloride in  NaCl is  1:1. It is found in seawater and is accountable for the salinity of the seawater. Also, NaCl is the extracellular fluid for various multicellular organisms.  

When refined, it becomes in its 'edible' form and is used in food preservatives. Whereas, the large quantity of sodium chloride is used in various industries.  

Answer:

A.) A substance that oxidizes another substance

Explanation:

An oxidizing agent always oxidize another substance by either accept electron, removing electronegative elements or adding electropositive elements to the substance.

- Describe how you would make the salt from the reactants.

CuO + 2 HCl → CuCl₂ + H₂O

- Describe how you would purify the salt from the reaction mixture.

Filter the solution and let the product crystallize.

Explanation:

The reaction between copper oxide (CuO) and hydrochloric acid (HCl) will produce copper chloride (CuCl₂) and water:

CuO + 2 HCl → CuCl₂ + H₂O

-Describe how you would make the salt from the reactants

In a beaker which contain cooper oxide add the hydrochloric acid. To avoid working with concentrated hydrochloric acid, the acid may be diluted with water but make sure the add the stoechiometric amount (and a little bit of excess) in respect with the copper oxide.

-Describe how you would purify the salt from the reaction mixture.

Let the reaction proceed and then filter the solution to remove the unreacted cooper oxide.

Let the filtered solution, which contain copper chloride, water and unreacted hydrochloric acid, to stand undisturbed for several days. You may see the crystals growing from the solution. To speed up the process you may reduce the temperature.

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purifying compounds

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To produce pure crystals of copper chloride, react copper oxide with hydrochloric acid to form copper chloride and water, then purify by filtration and evaporation to obtain copper chloride crystals.

To produce pure crystals of copper chloride from copper oxide and hydrochloric acid, the reaction involves a simple acid-base reaction, following the general word equation: acid + metal oxide → salt + water. First, copper oxide would react with hydrochloric acid to form copper chloride and water. This reaction can be represented by the equation CuO(s) + 2HCl(aq) → CuCl2(aq) + H2O(l).

To purify the copper chloride, the resulting mixture would need to be filtered to remove any unreacted copper oxide. Then, the copper chloride solution would be evaporated to obtain the crystals. This evaporation could either be done by gently heating the solution to accelerate the process or by allowing the water to evaporate naturally over time.

Answer:

Theoretical yield of Ca₃(PO₄)₂ = 19.67 g

Percent yield of Ca₃(PO₄)₂ = 11.4 %

Explanation:

Data given

Potassium Phosphate  K₃PO₄  = 30.00 g

calcium nitrate Ca(NO₃)₂ of 0.25 M  = 100.0 mL

Reaction given:

        2K₃PO₄(s) + 3Ca(NO₃)₂(aq) --------->  Ca₃(PO₄)₂(s) + 6KNO₃(aq)

Solution :

Part A :

To find the theoretical yield of Calcium phosphate

Look at the reaction :

             2K₃PO₄(s) + 3Ca(NO₃)₂(aq) ---------> Ca₃(PO₄)₂(s) + 6KNO₃(aq)

               2 mol          3 mol                               1 mol                6mol

 So,

2 mol of  2K₃PO₄ give 1 mole of Ca₃(PO₄)₂

if we represent mole in mass then

Molar Mass of K₃PO₄ =  3(39) + 31 + 4(16)

Molar Mass of K₃PO₄ =  212 g/mol

and

Molar mass of Ca₃(PO₄)₂  =  [ 3(40) + 2((31) + 4(16))]

Molar mass of Ca₃(PO₄)₂  =  [ 120 + 62 + 96] = 278 g/mol

Molar mass of Ca₃(PO₄)₂ = 278 g/mol

Now, if we write it in grams

  2K₃PO₄(s)    +      3Ca(NO₃)₂(aq) ---------> Ca₃(PO₄)₂(s)    +     6KNO₃(aq)

   2 mol                    3 mol                               1 mol                      6mol

  2 mol ( 212 g/mol)                                         1 mol (278 g/mol)

   424 g                                                               278 g

So from the above information we come to know that

    424 g of K₃PO₄ gives 278 g of Ca₃(PO₄)₂

then 30 g will give how much Ca₃(PO₄)₂ Calcium phosphate

Apply unity formula

    424 g of K₃PO₄ ≅ 278 g of Ca₃(PO₄)₂

       30 g of K₃PO₄ ≅ x g of Ca₃(PO₄)₂

By doing cross multiplication and rearranging the above values

      x g of Ca₃(PO₄)₂ = 278 g x  30 g / 424 g

      x g of Ca₃(PO₄)₂ = 19.67 g

So,

30 g of K₃PO₄ will give 19.67 g Ca₃(PO₄)₂ theoretically.

Theoretical yield of Ca₃(PO₄)₂ = 19.67 g

Now,

Part B :

To find percent yield of Ca₃(PO₄)₂

Solution

Data given:

       Actual yield of Ca₃(PO₄)₂ = 2.25 g

       Theoretical yield of Ca₃(PO₄)₂ = 19.67 g

Formula to be used:

         Percentage yield = Actual yield/ theoretical yield x 100 %

Put values in Above formula

       Percent yield = 2.25 g / 19.67 g x 100 %

       Percent yield =  0.1144 / 100 %

      Percent yield = 11.4 %

So,

Percent yield of Ca₃(PO₄)₂ = 11.4 %

Answer:

Empirical formula is H₃PO₄

Explanation:

Given data:

Percentage of hydrogen = 3%

Percentage of P = 32%

Percentage of oxygen = 65%

Empirical formula = ?

Solution:

Number of gram atoms of H = 3 / 1= 3

Number of gram atoms of O = 65 / 16 = 4.06

Number of gram atoms of P = 32 / 31 = 1.03

Atomic ratio:

            H                      :      P                 :            O

           3/1.03               :     1.03/1.03      :         4.06/1.03

            3                      :        1               :              4

H : P : O = 3 : 1 : 4

Empirical formula is H₃PO₄.

Answer:

0.87 moles

Explanation:

Given data:

Number of moles of magnesium = ?

Number of atoms of magnesium = 5.23 × 10²³ atoms

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

one mole = 6.022 × 10²³ atoms

5.23 × 10²³ atoms  × 1 mol / 6.022 × 10²³ atoms

0.87 moles

Answer:

m = 0.03  × 10⁴ g

Explanation:

Given data:

Specific heat capacity = 0.749 j/g.°C

Heat absorbed = 5.0 × 10⁴ J

Initial temperature = 26.0 °C

Final temperature = 275.0 °C

Mass = ?

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT  = T2-T1

ΔT  = 275.0 °C - 26.0 °C

ΔT  = 249  °C

Q = m.c. ΔT

m = Q / c. ΔT

m =  5.0 × 10⁴ J / 0.749 j/g.°C  × 249  °C

m =  5.0 × 10⁴ J / 186.5  j/g

m = 0.03  × 10⁴ g

The mass of glass required to absorb 5.00x10⁴ J of heat with a temperature change from 26.0°C to 275.0°C, using a specific heat capacity of 0.749 J/g°C, is approximately 268 grams.

We can use the formula for heat absorption:

[tex]q = m \times C_p \times \Delta T[/tex]

where:

Let's rearrange the formula to solve for m:

[tex]m = q / (C_p \times \Delta T)[/tex]

Substituting in the given values:

[tex]m = 5.00 \times 10^4 J / (0.749 J/g \textdegree C \times 249.0 \textdegree C)[/tex]

Simplifying the calculation:

[tex]m = \frac {5.00 \times 10^4 J}{ 186.501 J/g} = 268 g[/tex]

So, the mass of the glass needed to absorb 5.00x10⁴ J of heat, with the given temperature change, is approximately 268 grams.

Answer: As an object falls its potential energy decreases, while its kinetic energy increases. The decrease in potential energy is exactly equal to the increase in kinetic energy.

Explanation:

To find the Cl- concentration of the dilute solution, calculate the moles of MgCl2 in the original solution, use stoichiometry to determine the moles of Cl-, and divide by the volume to find its concentration.

To determine the concentration of Cl- in the dilute solution, we can use the concept of mole ratios. First, we calculate the number of moles of MgCl2 in the original solution by multiplying the volume of the solution by its concentration. Then, we use the stoichiometry of the equation to determine the number of moles of Cl-. Finally, we divide the number of moles of Cl- by the volume of the dilute solution to find its concentration.

Moles of MgCl2 = volume of solution (L) x concentration of MgCl2 (mol/L)

Moles of Cl- = Moles of MgCl2 x 2 (from the balanced equation)

Concentration of Cl- = Moles of Cl- / volume of dilute solution (L)

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Answer:

Fe → Fe⁺³ + 3e⁻

Explanation:

The oxidation half reaction for iron is:

Fe → Fe⁺³ + 3e⁻

Other options are incorrect because,

A) 3e⁻ + Fe  →   Fe³⁺

This is incorrect because when three electrons are gained by any atom it will gain negative three charge not positive.

C) 6e⁻ + 2Fe →  2Fe³⁺

This is incorrect because when six electrons are gained by any atom it will gain negative six charge not positive.

d) Fe →  2Fe³⁺ + 6e⁻

Its also incorrect because iron atoms are not balanced on both side of equation.

Answer:

space between particles

Explanation:

Properties of gases:

Molecule of gases randomly move everywhere and occupy all available space.

Gases don't have definite volume and shape and take the shape and volume of container in which it present.

Their densities are very low as compared to the liquid and solids.

Gas molecules are at long distance from each other therefore by applying pressure gases can be compressed.

The very weak inter molecular forces are present between gas molecules.

Properties of Liquid:

Liquid have definite volume but don,t have definite shape.

Their densities are high as compared to the gases but low as compared to the solids.

In liquid, molecules are close to each other and have greater inter molecular forces as compared to the gas molecules.

Properties of solids:

Solids have definite volume and shape.

In solids molecules are tightly pack and very close to each other.

Their melting and boiling point are every high.

The densities of solids are also very high as compared to the liquid and gas.

There are very strong inter molecular forces are present between solid molecules.

Answer:

3. The atoms on the left side of the arrow are the same as the atoms on the right, but are arranged differently.

Explanation:

A chemical reaction is represented by a chemical equation which show the reactant and products. Reactants are written on left side of arrow while products are written on right side. The number of atoms are remain same however arrangement of atoms is different on both side.

For example:

6H₂O + 6CO₂ + energy  →   C₆H₁₂O₆ + 6O₂

it is known from balanced chemical equation that 6 moles of carbon dioxide react with the six moles of water and created one mole of glucose and six mole of oxygen. The number of atoms are same on both side however arrangement of atoms is different.

Answer:

1. The resulting mixture was cloudy.

Explanation:

There are 5 observations that can be observed when a chemical change takes place:

1. Color change.

2. Temperature change.

3. Formation of precipitate.

4. Production of gas.

5. Light Emission.

1st option clearly implies that a precipitate has been formed, which according  to the 3rd point as mentioned above is an evidence of a chemical change.

3rd option shows a color change but is not the best evidence because it might also be that dilution has taken place, which isn't a chemical change. Hence, it isn't the best evidence.

Therefore, 1st option is the best choice.

3 The resulting liquid was light blue.

Of the ten characteristics of chemical reactions, the occurrence of color changes is the characteristic that is most easily seen and known quickly, so the third choice is the most appropriate answer.

Chemical changes are changes in a substance or material that causes the formation of new substances. The characteristics of chemical change are: new types of substances are formed, substances that change cannot return to their original form, followed by changes in chemical properties through chemical reactions. During chemical changes, the mass of the substance before the reaction is the same as the mass of the substance after the reaction.

Different chemical reactions are used together in chemical synthesis to produce the desired compound product. In biochemistry, a series of chemical reactions are catalyzed by enzymes to form metabolic pathways, where synthesis and decomposition that are normally not possible in cells are carried out.

Chemical properties are properties for which chemical changes are needed.

The nature of matter tends to carry out chemical reactions, including:

Characteristics of Chemical Reactions

Here are ten characteristics of chemical reactions that are most easily observed.

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Details

Grade: Middle School

Subject: Chemistry

keywords: Chemical changes, characteristics of chemical reactions

Answer:

7

Explanation:

Because cobalt's a transition metal, the 7 'd'-type electrons can count as valence electrons, though they rarely react with anything.