100POINTS!!!!

Label each reaction to either homogeneous OR heterogeneous

Answer:

Clay

Explanation:

Since Clay has a very small particle size it compacts or has a high surface area which slows the path of water, holding it for longer periods compared to other soil components.

[tex]S_8 +120_2[/tex] → [tex]8SO_3[/tex] has been balanced correctly.

A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products.

[tex]S_8 +120_2[/tex] → [tex]8SO_3[/tex] has been balanced correctly and the rest are not balanced.

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Answer:

15 L water at 25℃

Explanation:

Answer:

15 L water at 25°C

Question: As the temperature of a substance increases, the average kinetic energy of the particles in the substance

Answer: increases

Explanation:

The sentence best describes the shapes of the moon over the course of about a month is over the course of about a month, the shape of the moon changes from a full circle, to a crescent, and back to a full circle.

The moon when looks like a full circle and having the highest brightness over its life cycle is called the full moon.

The full moon, crescent, half moon or no moon are all the stages of a Moon's lifecycle.

Over a period of 14 days, moon changes from a full moon to no moon. In the another 14 days, no moon changes to full moon. This cycle keeps on going for years and years.

Thus, the sentence best describes the shapes of the moon over the course of about a month is over the course of about a month, the shape of the moon changes from a full circle, to a crescent, and back to a full circle.

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Answer:

Over the course of about a month, the shape of the moon changes from a full circle, to a crescent, and back to a full circle.

Explanation:

Answer:

In 1913, Niels Bohr proposed a theory for the hydrogen atom, based on quantum theory that some physical quantities only take discrete values. Electrons move around a nucleus, but only in prescribed orbits, and if electrons jump to a lower-energy orbit, the difference is sent out as radiation.

During photosynthesis green plants use solar energy to produce fuel hence 'Energy in the form of sunlight must be added' that is option D is the correct option.

Photosynthesis is an endothermic reaction because green plants use solar energy in the form of sunlight, along with water and carbon dioxide in the air, to produce their food in the form of glucose.

Endothermic reactions are chemical reactions where the reactants utilize heat energy from the surroundings to form products.

Since energy as sunlight is used in the photosynthesis reaction, 'Energy in the form of sunlight must be added' that is option D is the correct option.

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The final temperature of the copper and water in the calorimeter given the data is 30.3 °C

Heat loss = Heat gain

MᵥᵥC(Tᵥᵥ – Tₑ) = M꜀C(Tₑ – M꜀)

95 × 0.385 (77.9 – Tₑ) = 42 × 4.184(Tₑ – 20.4)

36.575(77.9 – Tₑ) = 175.728(Tₑ – 20.4)

Clear bracket

2849.1925 – 36.575Tₑ = 175.728Tₑ – 3584.8512

Collect like terms

2849.1925 + 3584.8512 = 175.728Tₑ + 36.575Tₑ

6434.0437 = 212.303Tₑ

Divide both side by 212.303

Tₑ = 6434.0437 / 212.303

Tₑ = 30.3 °C

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The correct match of the compounds to their characters are:

Ionic compound: made of positive-negative ion and break into pieces easily.

Metallic compound: can be hammered into different shapes and conduct electricity.

Both: are held together with opposite ions, the high boiling point.

Compounds are made up by mixing two or more metals or non-metals.

Different compounds have different chemical properties.

Thus, the Ionic compound: is made of positive-negative ion and break into pieces easily.

Metallic compound: can be hammered into different shapes and conduct electricity.

Both: are held together with opposite ions, the high boiling point.

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On increasing temperature , On decreasing pressure , on increasing the number of air molecules in the balloon volume will increase

The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases.

An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).

Considering the gas inside the balloon to be ideal

We can understand from the ideal gas equation that

V∝ Temperature

V∝ Number of air molecules

V ∝ (1/P)

Therefore on increasing temperature volume will increase ,

On decreasing pressure volume will increase

and on increasing the number of air molecules in the balloon volume will increase.

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Answer:

3 Ca(OH)2 + 2 K3PO4 ---> Ca3(PO4)2 + 6 KOH

Explanation:

Just balance each atom on both sides.

Darmstadtium based on its position in the periodic table, proposes three different reasonable valence electron configurations for this element is 2.

​

Darmstadtium was first synthesized by research scientists at the Heavy Ion Research Laboratory in Darmstadt, Germany in 1994. The element was made by bombarding lead-208 atoms with nickel-62 atoms in a heavy-ion accelerator. Four atoms of darmstadtium were produced in the first experiment.

Darmstadtium is a chemical element with the symbol Ds and atomic number 110.

It is an extremely radioactive synthetic element.

Darmstadtium based on its position in the periodic table, proposes three different reasonable valence electron configurations for this element is 2.

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Answer: 0.052moles

Explanation:

number of moles = given mass (g) / molar mass(g/mol)

n=m/M

n= 5.2g/ (40 + 12 + 48)g/mole

n=5.2g/100g/mol

n=0.052 moles

Answer:

a. 480 kilojoules

Explanation:

good luck have a nice day

[tex]\tt Kp=Kc(RT)^{\Delta n}[/tex]

NH₄Cl (s) ⇔ NH₃ (g) + HCl (g)

Δn = 2 (gas only)

R = 0.082

T = 427 + 273 = 700 K

4.8 = Kc (0.082 x 700)²

Kc = 1.45 x 10⁻³

Answer: an exothermic reaction in which entropy increases

Explanation:

Spontaneous reactions normally cause an increase in entropy and are also exothermic.

Answer:

0.409 mol

Explanation:

The formula to find he number of moles is:

No. of moles = [tex]\frac{mass}{Mr}[/tex]

Mr of MgBr₂ = 24.3 + (79.9 × 2) = 184.1

Mass = 75.25g

So, no. of moles = [tex]\frac{75.24}{184.1}[/tex]

No. of moles = 0.409 mol [to 3 significant figures]

The number of molecules of sugar, C₁₂H₂₂O₁₁ you ingest given the data is 6.86×10²² molecules

1 mole of C₁₂H₂₂O₁₁ = 6.02×10²³ molecules

But

1 mole of C₁₂H₂₂O₁₁ = 342 g

Thus,

342 g of C₁₂H₂₂O₁₁ = 6.02×10²³ molecules

342 g of C₁₂H₂₂O₁₁ = 6.02×10²³ molecules

Therefore,

39 g of C₁₂H₂₂O₁₁ = (39 × 6.02×10²³) / 342

39 g of C₁₂H₂₂O₁₁ = 6.86×10²² molecules

Thus, 6.86×10²² molecules are present in 39 g of sugar, C₁₂H₂₂O₁₁

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Answer:

P value is commonly used. The prevalent use of P values to summarize the results of research articles could result from the increased quantity and complexity of data in recent scientific research.

Explanation:

Answer:

27) Double replacement

28) 2NaOH + H2SO4 --> Na2SO4 + 2H2O

Explanation:

Oxidation state of Nitrogen in N2O5 is +5

This is a good answer:

Because this is a double replacement reaction, the iron and potassium will swap places, giving [tex]\text{K}_{2}\text{Cl}_{2}[/tex] and [tex]\text{FeS}[/tex].

The names of these compounds are potassium chloride and Iron(II) sulfide

Answer:

8,400

Explanation:

multiply 8.4kg by 1000

Answer:

8400g

Explanation:

1kg=1000g

8.4*1000g=8400kg

I showed maturity when I turn 13 year old

The amount of water that must be added to 6.0 M silver nitrate to make 500mL of 1.2 M solution is : 2000 mL

Given data :

Concentration of siilver nitrate ( M₁ ) = 6.0 M

volume of solution ( V₁ ) = 500 mL

Conc of solution ( M₂ )= 1.2 M

we will apply the equation below

M₁V₁ = M₂V₂ ---- ( 1 )

where : V₂ = V₁ + water added  ---- ( 2 )

V₂ ( Final volume ) = ( M₁V₁ ) / M₂

                              = ( 6 * 500 ) / 1.2

                              = 2500 mL

Back to eqaution ( 2 )

2500 mL = 500 mL + added water

therefore ; added water = 2500 - 500

                                        = 2000 mL

Hence we can conclude that The amount of water that must be added to 6.0 M silver nitrate to make 500mL of 1.2 M solution is : 2000 mL.

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the molarity of a solution made by dissolving 5.67 g of potassium chloride in enough water to make 100.0 mL of solution.

20.91200832 g of [tex]Ca(OH)_{2}[/tex] must be dissolved in 0.504 L of a solution to make a 0.56 M solution.

What is the molarity of a solution?

Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution. Molarity is also known as the molar concentration of a solution.

[tex]Molarity = \frac{Mole \;of \;solute}{Volume \;of \;solution \;in \;litre}[/tex]

Given data:

The volume of solution=  0.504 L

Molarity of [tex]Ca(OH)_{2}[/tex] = 0.56 M

Step 1: Calculating the mass of [tex]Ca(OH)_{2}[/tex]

Putting the given values in the equation.

[tex]Molarity = \frac{Mole \;of \;solute}{Volume \;of \;solution \;in \;litre}[/tex]

[tex]0.56 M = \frac{Mole \;of \;solute}{0.504 L }[/tex]

Moles of solute = 0.28224  

[tex]Moles \;of \;solute= \frac{Given \;mass}{Molar \;mass}[/tex]

Molar mass of [tex]Ca(OH)_{2}[/tex] = 74.093 g/mol

Now, put the values in the formula.

[tex]Moles \;of \;solute= \frac{Given \;mass}{Molar \;mass}[/tex]

[tex]0.28224 mol= \frac{Given \;mass}{74.093 g/mol}[/tex]

Mass of [tex]Ca(OH)_{2}[/tex] =20.91200832 g

Hence, 20.91200832 g of [tex]Ca(OH)_{2}[/tex] must be dissolved in 0.504 L of a solution to make a 0.56 M solution.

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Answer:

True

Explanation:

Vocal folds vibrate when excited by aerodynamic phenomena; they are not plucked like a guitar string. Air pressure from the lungs controls the open phase. The passing air column creates a trailing “Bernoulli effect,” which controls the close phase.

Answer:

yes

Explanation:

well for some people because some times u can control your voice and sometimes u just get voice cracks