2.26 g of liquid water at 23.5 ◦C was com- pletely converted to ice at 0 ◦C. How much heat was (absorbed/released) by the system during this process?

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.

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Answer:

800 mL

Explanation:

This is a dilution question so we have to use the dilution formula

c1v1 = c2v2

Where c1 is the concentration and v1 is the volume of the concentrated solution

And c2 is concentration and v2 is volume of the diluted solution to be prepared

Substituting the values in the equation

3.50 M x 480.0 mL = 2.10 M x v2

v2 = 800 mL

A volume of 480.0 mL of 3.50 M solution should be diluted upto a volume of 800 mL to make a diluted copper nitrate solution of concentration 2.10 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.

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

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.

Which unit is not a measurement of volume?

cm

L

ml

cm³

Cm is a measurement for length

Since cm is the unit for the measurement of length, it has not been used to measure volume.  L, ml, and cm3 are the units for the measurement of volume.

Volume can be described as the space occupied by the liquid. The liquid has no specific shape however they can attain the shape of the container in which they are kept.

The unit has been used to describe or measure a specific parameter. Units can be interconverted from one to another and help in the equivalent value in another unit.

The unit for the length, volume, weight are all assigned by the standard methods.

The centimeter is the unit of length and has been used for the measurement of matter in terms of length. It can give the length of a piece of land, cloth, etc.

liter, milliliter, and centimeter cube have been the value that has been used for the measurement of the volume.

Since cm is the unit for the measurement of length, it has not been used to measure volume.  L, ml, and cm3 are the units for the measurement of volume.

For more information about the measurement unit, refer to the link:

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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

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...

[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.

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.  

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.

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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= 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

In the vapour pressure of solution when the solute is mixed in water it will less than the actual solvent so the correct answer is pure water as it is universal solvent therefore water can disolve so many sustances in it 

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Answer : The correct options is, (D) Pure water.

Explanation :

According to the relative lowering of vapor pressure, the vapor pressure of a component at a given temperature is equal to the mole fraction of that component of the solution multiplied by the vapor pressure of that component in the pure state.

Formula used :

[tex]\frac{\Delta p}{p^o}=i\times X_B[/tex]

where,

[tex]p^o[/tex] = vapor pressure of the pure component (water)

[tex]p_s[/tex] = vapor pressure of the solution  

[tex]X_B[/tex] = mole fraction of solute

i = Van't Hoff factor

(A) The dissociation of 0.1 M [tex]NaCl[/tex] will be,

[tex]NaCl\rightarrow Na^++Cl^-[/tex]

So, Van't Hoff factor = Number of solute particles = [tex]Na^++Cl^-[/tex] = 1 + 1 = 2

(B) The dissociation of 0.1 M [tex]KCl[/tex] will be,

[tex]KCl\rightarrow K^++Cl^-[/tex]

So, Van't Hoff factor = Number of solute particles = [tex]K^++Cl^-[/tex] = 1 + 1 = 2

(C) [tex]C_{12}H_{22}O_{11}[/tex], sucrose is a non-electrolyte solute that means they retain their molecularity, and not undergo association or dissociation.

So, Van't Hoff factor = 1

(D) Pure water : As we know that the vapor pressure of a pure solvent is always greater than the vapor pressure of a solution that containing a non-volatile liquid.

As we know that the vapor pressure is depend on the Van't Hoff factor but the vapor pressure of a pure solvent is always greater.

Hence, from this we conclude that, the pure water have the highest vapor pressure.

the element chlorine is represented by the symbol Cl

All first letters on the Periodic Table are Capitalized. The answer is Cl.

black would be BB .

dominant gene is B.

phenotyope is where it says white fur.

recessive gene is b.

white is bb

Elements on the Periodic Table are organized according to an increasing atomic number. Each element's box contains its atomic number, symbol, and average atomic mass. They're arranged in rows and columns to reflect shared properties.

On the current Periodic Table of elements, elements are aligned according to an increasing attribute known as the atomic number. The atomic number signifies the number of protons in the nucleus of an atom. Each box in the table represents an element and consists of the atomic number, symbol, average atomic mass, and sometimes the name of the element. The elements on the table are arranged in seven horizontal rows, referred to as periods or series, and 18 vertical columns, often labeled as groups. Groups from 1 to 18 are assembled based on shared properties, which allows scientists to anticipate behaviors of elements.

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The Periodic table of the elements is arranged according to increasing atomic number. This system organizes the elements into groups of similar properties, making the table a vital tool for predicting the characteristics of individual elements.

The Periodic table of the elements is a tool where the elements are arranged according to an increasing order of their atomic numbers which corresponds with the number of protons in each nucleus. Atomic number plays a major role in the table's structure, organizing the elements into seven horizontal rows or periods, and 18 vertical columns or groups. Atoms with similar properties are grouped together in the same vertical column. This arrangement allows for the prediction of an element's properties based on its location within the table.

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Well, in an atom, there are an equal number of protons and electrons so they cancel each other out.

okayy so in atom there is an equivalent amount of protons AND electrons , meaning they would cancel each other out.

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

Answer:

D

Explanation:

because it is right

B: CaCO₃ is a compound in and of itself thus it is not a polyatomic ion.

Atomic mass is never an integer number for several reasons: The atomic mass reported on a periodic table is the weighted average of all the naturally occuring isotopes. Being an average it would be most unlikely to be a whole number. The mass of an individual atom in atomic mass units is the mass relative to carbon-12.

Answer:

This is because the atomic mass ir usually calculated as the weighted average of the masses of the different isotopes of each element taking into account the relative abundance of each of them.

Explanation:

The isotopes of an element are those in which its atomic numbers (that is, the number of protons) are equal, but the number of neutrons is different. Record that protons and neutrons are found in the nucleus of the element. The same chemical element may consist of different atoms, that is, different isotopes. Then the atomic mass of an element is the weighted average mass of its natural isotopes. Therefore, the atomic mass of an element is not an integer. The weighted average means that not all isotopes have the same percentage. In other words, the atomic masses of the chemical elements are usually calculated as the weighted average of the masses of the different isotopes of each element taking into account the relative abundance of each of them.

This produces that the atomic mass  don't always be a whole number

Answer:

1.25 moles of HF

Explanation:

1 mole = 20.0 grams of HF

So, to calculate mass of 25.0 grams

                                       =25.0*1/20.0

                                       =1.25 moles

In the year 1909, Robert A. Millikan and Harvey Fletcher performed the oil drop experiment.

Answer:

Robert Millikan

Explanation:

(APEX)

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]

{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! •.•}

Higher velocity of particles

The diffusion rate is determined by a variety of factors which includes;

The correct answer is c. Higher velocity of particles leads to a higher rate of diffusion.

Diffusion is the process by which particles spread out from an area of high concentration to an area of lower concentration. The rate of diffusion is influenced by several factors, including the temperature, the molar mass of the particles, and the velocity of the particles.

 1. Temperature: Increased temperature results in higher kinetic energy of the particles, which increases their velocity. Therefore, higher temperatures lead to a higher rate of diffusion. Conversely, cooled gas (reduced temperature) would have a lower rate of diffusion.

2. Molar Mass: Heavier particles (higher molar mass) move more slowly than lighter particles because they have more mass to move. Therefore, gases with a lower molar mass diffuse more quickly than those with a higher molar mass.

3. Velocity of Particles: The rate of diffusion is directly proportional to the average velocity of the particles. Faster-moving particles will spread out more quickly, leading to a higher rate of diffusion

In summary, higher velocity of particles is the factor that leads to a higher rate of diffusion. This is because faster-moving particles cover more distance in a given time, leading to a quicker spread of particles from high to low concentration areas.

Average kinetic energy

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The next vice I think it's c

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]

D) Constructive; process

Answer:

D) Destructive; process

Explanation:

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