TIMED TEST HELP
As the sun heats the earth unevenly, the air rises and falls.

Which factor in the atmosphere does this result from?


arctic chill

Hanley cells

thunderstorms

increase in oxygen gas

The Earth weighs, 5.972 × [tex]10^{24}[/tex] kg. For far away the sun is from the Earth is, 92.96 million mi.

There are 4 N and 12 H so I think 16

There are 16 atoms in 4NH3

The smallest part of the matter is called atom .

An atom contains neutron, proton and electrons.

In the given question there is one molecule of NH3 , there is one Nitrogen atom and three hydrogen atom . So, for four molecule of NH3 there are four nitrogen atom and 4*3 hydrogen atom means twelve hydrogen atom.

So, total number of atoms in 4NH3 is 4+12 = 16

To learn about an atom here

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The same number of atoms of each element must appear on both sides of a chemical equation. However, simply writing down the chemical formulas of reactants and products does not always result in equal numbers of atoms. You have to balance the equation to make the number of atoms equal on each side of an equation.

Balancing a chemical equation is crucial as it adheres to the law of conservation of mass, indicating the same number and types of atoms on both sides. This reflects the physical reality of chemical reactions, where mass and atom types are conserved, allowing for accurate predictions and understanding of reactions.

The requirement that the numbers and types of atoms be the same on both sides of a chemical equation is fundamental to the law of conservation of mass. This law states that mass cannot be created or destroyed in a chemical reaction. Therefore, a balanced chemical equation ensures that the same amount of each element is present on both sides of the equation, aligning with this universal law. To balance a chemical equation, coefficients are placed in front of the reactants or products to ensure that the number of atoms for each element is equal on both sides. This process does not involve changing the substances themselves but rather adjusting the quantities to reflect the conservation of atoms. For instance, if an equation starts with two hydrogen molecules reacting with one oxygen molecule to produce water, the balanced form would show that two water molecules are produced, maintaining the count of hydrogen and oxygen atoms. In practice, balancing a chemical equation not only obeys the law of conservation of mass but also ensures the equation accurately represents the physical reality of how substances interact and transform. This precision is crucial for predicting the outcomes of reactions, calculating reactant and product quantities, and understanding the molecular rearrangement during the reaction. Unbalanced equations, by contrast, imply that atoms are lost or gained, misrepresenting the reaction's nature.

Answer:

50mL NaOH

This is the answer for edge

part 1: .0025

part 2: 50

part 3: .033

Answer: it's 50. also the answers that the other dude posted are correct for edg.

Explanation:

Answer:

2.41 M

Explanation:

The molarity is the moles of FeCl3 over the liters of solution. Since you're given mL you need to change it to L which is 0.12 L. 0.289 divided by 0.12 is your answer

Final answer:

The molarity of 0.289 moles of [tex]FeCl_3[/tex] dissolved in 120 mL of solution is 2.408 M.

Explanation:

To calculate the molarity (M) of a [tex]FeCl_3[/tex] solution, you use the formula:

[tex]M = \frac{moles of solute}{ liters of solution}[/tex]

In this case, we have 0.289 moles of [tex]FeCl_3[/tex] dissolved in 120 mL of solution. First, we must convert 120 mL to liters by dividing by 1000 (since there are 1000 mL in a liter), giving us 0.120 liters.

Now plugging the values into the molarity equation:

[tex]M = \frac{0.289 moles}{0.120 L} = 2.408 M[/tex]

Therefore, the molarity of the [tex]FeCl_3[/tex] solution is 2.408 M.

Answer:

n of krypton = 1.23 mol.

The no. of moles will not be changed, if the gas is either argon or krypton.

Explanation:

Where, P is the pressure of the gas in atm (P = 6.0 atm).

V is the volume of the gas container in L (V = 5.0 L).

n is the no. of moles of the gas.

R is the general gas constant (R = 0.082 L.atm/mol.K).

T is the temperature of the gas in K (T = 25.0°C + 273 = 298.0 K).

∴ n = PV/RT = (6.0 atm)(5.0 L)/(0.082 L.atm/mol.K)(298.0 K) = 1.228 mol = 1.23 mol.

The no. of moles will not be changed, if the gas is either argon or krypton because it does not depend on the type of the gas.

magnesium oxide is: MgO (right side)

so the left side is: Mg + O2

for the equation to be balanced there must be two oxygens on both sides

Mg + O2 = 2MgO

but now the magnesium is uneven, so there must be two magnesiums on each side

the answer is: B) 2Mg + O2 = 2MgO

Answer : The correct balanced chemical reaction will be,

(B) [tex]2Mg(s)+O_2(g)\rightarrow 2MgO(s)[/tex]

Explanation :

Balanced chemical reaction : It is defined as the reaction in which the number of atoms of individual elements present on reactant side must be equal to the product side.

If the amount of atoms of each type on the left and right sides of a reaction differs then to balance the equation by adding coefficient in the front of the elements or molecule or compound in the chemical equation.

Synthesis reaction : A chemical reaction where multiple substances or reactants combine to form a single product.

It is represented as,

[tex]X+Y\rightarrow XY[/tex]

The balanced chemical reaction will be,

[tex]2Mg(s)+O_2(g)\rightarrow 2MgO(s)[/tex]

1st figure

answer

c)12

2nd

answer

c)28

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7.65 × 10⁻³ L.

3 sig. fig. as in the mass of formic acid.

How many moles of formic acid?

Relative atomic mass from a modern periodic table:

Molar mass of formic acid [tex]\text{HCOOH}[/tex]:

[tex]1.008 + 12.011 + 2\times 15.999 + 1.008 = 46.025\;\text{g}\cdot \text{mol}^{-1}[/tex].

Number of moles of formic acid molecules in the 0.0634 gram sample:

[tex]\displaystyle n = \frac{m}{M} = \frac{0.0634}{46.025} = 1.37751\times 10^{-3}\;\text{mol}[/tex].

Keep at least one extra sig. fig. to avoid rounding errors.

How many moles of NaOH?

It takes one [tex]\text{OH}^{-}[/tex] ion to neutralize each carbonyl group [tex]-\text{COOH}[/tex].

There's one carbonyl group in each formic acid [tex]\text{H-}\text{COOH}[/tex] molecule. Each formula unit of NaOH supplies one [tex]\text{OH}^{-}[/tex] ion. As a result, it takes one mole formula units of NaOH to neutralize one mole formic acid molecules.

There are [tex]1.37751\times 10^{-3}\;\text{mol}[/tex] of formic acid in the volumetric flask. It will take the same number of NaOH formula units to reach the equivalence point.

How many liters of NaOH?

[tex]\displaystyle V = \frac{n}{c} = \frac{1.37751\times 10^{-3}\;\text{mol}}{0.1800\;\text{M}}= \frac{1.37751\times 10^{-3}\;\text{mol}}{0.1800\;\text{mol}\cdot\text{L}^{-1}} = 7.65\times 10^{-3}\;\text{L}[/tex].

How many significant figures?

Number of sig. fig. in data involved in the calculation:

Take the least number of sig. fig. as the number of sig. fig. in the answer. As a result, the volume of NaOH should be rounded to three sig. fig.

To solve the given titration calculation, first convert the given weight of formic acid into moles. Since formic acid and NaOH react in a 1:1 ratio, the same amount of moles of NaOH is needed. Then, use the molarity of NaOH to find the volume in liters (or milliliters), which comes out to be 7.67 mL.

The question involves a titration calculation, which requires knowledge of stoichiometry. Given the weight of formic acid, we first need to calculate the number of moles of it and then use stoichiometry to calculate the equivalent volume of 0.1800M NaOH needed to neutralize the acid.

First, convert the weight of the formic acid (HCHO2) into moles using its molar mass (46.03 g/mol). So, moles of formic acid = 0.0634g / 46.03 g/mol = 0.00138 mol.

Formic acid and NaOH react in a 1:1 ratio, so moles of NaOH needed = moles of formic acid = 0.00138 mol.

Now, use the molarity of NaOH to find the volume. Volume = moles / molarity = 0.00138 mol / 0.1800 mol/L = 0.00767L or 7.67 mL. This is the volume of NaOH solution needed to reach the equivalence point.

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Average kinetic energy

hope this helps :)

The next vice I think it's c

= 0.6224 M

Molarity is given by the formula;

Molarity = Number of moles/Volume

But moles = mass/Molar mass

Thus;

Moles = 12.47 g/80.043 g/mol

          = 0.1556 Moles

Therefore;

Molarity = 0.1556 moles/0.25

Because the Earth has biological ecosystems that ensure a supply of liquid water, inlcuding an atmosphere, living plant life and gaseous exchange systems that enable liquid water to be produced. None of this applies to the Moon.

Answer:

Because the gravity of the earth, unlike the gravity of the moon, is sufficient so that the earth's water does not evaporate or drain into space.

Explanation:

The most widely accepted explanation of how water on earth came about says that comets and asteroids - which have water in their constitution - bombarded our planet and left that element on its surface. Since the earth and the moon are so close together and occupy almost the same place in space, it is to be imagined that these comets and asteroids also hit the moon and leave water reserves there. However, the moon's gravity is much lower than the earth's gravity. This low moon gravity caused most of its water reservoir to evaporate or drain into space.

Answer: D. Water particles are not fixed in place.

Answer:

D

Explanation:

because it is right

The earth’s atmosphere is heated through radiation by the sun. This means the wavelengths of the sunlight are absorbed by the molecules hence exciting them. When a mass of air is heated by radiation,  it becomes less dense creating an area of low pressure. The air rises and cooler air mass moves in to replace the rising air. This is how winds are created.

maybe centuries classified according to their chemical and mineral composition as felsic, intermediate, mafic, and ultramafic, and by texture or grain size

Explanation:

Igneous rocks -

These type of rocks are formed via the crystallization of the liquid , which is the molten rocks .

The categories of distribution of the igneous rock is -

1. Intrusive or the plutonic rocks .

2.  Extrusive or volcanic rocks .

And the classification of Igneous rock is as follows -

1. felsic

2. mafic

Ionic bonds form when a nonmetal and a metal exchange electrons, while covalent bonds form when electrons are shared between two nonmetals. An ionic bond is a type of chemical bond formed through an electrostatic attraction between two oppositely charged ions.

Answer:

B. Magnesium and Bromine

Explanation:

Magnesium is you solid based element in the compound or bond. With ability to conduct electricity when applied to bromine your non-metal. Bromine is one of the two liquids on the periodic table along with mercury so it can be tricky to test in water.   Lastly the test in Edgenuity( or wherever you took this test) the first answer krypton and lithium could be a possible answer, but on the test your correct answer is B. Magnesium and Bromine.

                     Thank You...

It will decrease the volume of gas.

The volume of the gas has decreased by 1/2.

Answer:

d-  334 kJ/g.

Explanation:

You can detect it from the units of the different choices.

a- has the unit J/g.°C that is the unit of the specific heat capacity (c).

b- has the unit Kelvin that is the unit of temperature.

c- has the unit g/mol which is the unit of the molar mass.

d- has the unit kJ/g which is the unit of the enthalpy divided by the no. of rams that is the specific entha;py of fusion.

So, the right choice is: d-  334 kJ/g.

Esterification is an B. Equilibrium reaction.

Answer: option B, Equilibrium

Explanation: Formation of ester by the reaction of Carboxylic acid and alcohol in the presence of mineral acids is called Esterification.

And entire reaction is a reversible and in equilibrium

A reverse reaction occurs on hydrolysis of Ester.

Hence Reactants and products are in equilibrium.

Example

CH3COOH+C2H5OH <------> CH3COOC2H5 +H2O

wavelength i think should be correct

The correct answer is E. 50 grams

The solubility of Ammonium Chloride has an increasing trend as the temperature increases. Experiments show that the solubility at 323K is approximately 50.4 grams per 100 grams o water thus this value is close to choice D, 50 grams

Answer: The correct answer is Option E.

Explanation:

Solubility is defined as the amount of substance (known as solute) which is dissolved in a unit volume of liquid substance (known as solvent) to produce a saturated solution at specific temperature and pressure. It is expressed in number of moles of solute present per 100 grams of solvent.

This property is directly dependent on temperature. As, the temperature increases, the solubility of the solute increases and vice-versa.

[tex]\text{Solubility}\propto \text{Temperature}[/tex]

[tex]NH_4Cl[/tex] is an ionic salt whose solubility increases as we increase the temperature.

The solubility of ammonium chloride at 50°C is 50 grams.

Hence, the correct answer is Option E.

[tex]4.4\; {\rm g}[/tex].

Refer to a modern periodic table for relative atomic mass:

Formula of copper (II) chloride: CuCl₂.

Formula mass of copper (II) chloride:

63.546 + 2 × 35.45 = [tex]134.446\; {\rm g \cdot mol^{-1}}[/tex].

How many [tex]{\rm mol}[/tex] of formula units in 8.3 grams of CuCl₂?

[tex](8.3\; {\rm g}) / (134.446\; {\rm g \cdot mol^{-1}}) \approx 0.0617\; {\rm mol}[/tex]

Note the subscript "2" in the formula CuCl₂. There are [tex]2\; {\rm mol}[/tex] of chloride ions in every [tex]1\; {\rm mol}[/tex] formula unit of CuCl₂.

There would be [tex]2 \times 0.0617\; {\rm mol} \approx 0.123\; {\rm mol}[/tex] of [tex]{\rm Cl^{-}}[/tex] ions in [tex]0.0617\; {\rm mol}[/tex] formula units of CuCl₂.

The mass of [tex]1\; {\rm mol}[/tex] of chloride ion is 35.45 grams.

The mass of [tex]0.123\; {\rm mol}[/tex] of [tex]{\rm Cl^{-}}[/tex] ions will be [tex]35.45 \times 0.123 \approx 4.4\; {\rm g}[/tex].

Round the final value to two sig. fig. since the mass in the question is also 2 sig. fig.

Your answer would be sodium hydroxide.

Your compound is an ionic molecule, because of the positivity of sodium and the negativity of the OH.

In naming these, the name starts with the metal. In this case, it's sodium.

So we know it's sodium _____.

You're left with the OH. To combine them, it becomes hydroxide.

Therefore, you're left with sodium hydroxide.

Good luck!

{System:Hello beautiful user! The answer for this question is B-Chemical reaction. It’s chemical reaction because melting ice is being used my a natural chemical and it’s also a reaction from the natural chemical. I hope this helps you! •.•}

The correct option is D.

Nowadays, scientists classified substances into four states of matter, which are: solid, liquid, gases and plasma. Plasma are hot ionized gas that is made up of equal number of positively and negatively charged ions. The ions in the plasma have very high kinetic energy which allow them to move around at high speed. Plasma is typically produce by heating gases to very high temperature.  

At night, low temperatures can cause rocks to CONTRACT.

Answer:

They can cause rocks to contract

Explanation:

if the rocks melt it would have to either be really hot or a chemical reaction and when rocks expand that would need heat so the last answer that is left is contract.

HOPE THIS HELPS

black would be BB .

dominant gene is B.

phenotyope is where it says white fur.

recessive gene is b.

white is bb

C. 2.1 x 10–10 M

pKw=pH + pOH = 14  

pOH = 14-4.32

        =9.68  

But; pOH = -log[OH]

[OH-]=10^(-9.68)

         =2.089x10^-10M

Answer: The concentration of hydroxide ion concentration is [tex]2.08\times 10^{-10}[/tex]

Explanation:

pH is defined as negative logarithm of hydrogen ion concentration. It is basically defined as the power of hydrogen ions in a solution.

To calculate the hydroxide ion concentration of the solution, we need to determine the pOH of the solution first and to do so, we calculate the pOH by the following equation:

[tex]pH+pOH=14\\pOH=14-4.32=9.68[/tex]

pOH is defined as negative logarithm of hydroxide ion concentration. It is basically defined as the power of hydroxide ions in a solution.

The equation used to calculate pOH of the solution is given as:

[tex]pOH=-\log[OH^-][/tex]

pOH of the solution = 9.68

Putting values in above equation, we get:

[tex]9.4=-\log[OH^-][/tex]

[tex][OH^-]=antilog(-9.68)[/tex]

[tex][OH^-]=2.08\times 10^{-10}[/tex]

Hence, the concentration of hydroxide ion concentration is [tex]2.08\times 10^{-10}[/tex]

Answer:

New concentration = 1.512 M

Explanation:

Using the equation for dilution;

M1V1 = M2V2

M1 = 12.4 M , V1 = 100 mL or 0.1 L

M2 = ? , V2 = 0.820 L

Therefore;

M2 = M1V1/V2

     = (12.4 × 0.1 )/(0.820L)

     = 1.512 M