The enthalpy of vaporization at 25.0oC for a particular substance is 351 J/g. Calculate the amount of heat required to completely vaporize 1.0 x 10^3 mL of the substance into the gas state at 25.0°C. The density of the substance is 714 g/L.

Answer:

1d and 2d is the answer. Hope it helps

Answer:

D. The electrons are trapped in the crystal lattice structure and cannot move.

Explanation:

Ionic compounds are compounds that consist of positive and negative ions that are held together by the electrostatic forces of attraction. In the solid phase, these ions are arranged in a regular, repeating pattern known as a crystal lattice. The ions are held in place by the electrostatic forces of attraction, and the electrons are trapped within the crystal lattice structure. Because the ions and electrons are unable to move freely, ionic compounds do not conduct electricity in the solid phase.

Answer:

hey mate your answer is

D ALL OF THESE

HOPE IT HELPS YOU

To make sedimentary rock, broken bits of sedimentary, igneous, and metamorphic rocks get deposited in layers and bonded together.

So, option d. is correct.

Sedimentary rocks are created by the accumulation and deposition of mineral and organic particles just at earth's surface, followed by cementation. The processes that enable these particles that settle in place are referred to as sedimentation.

To make sedimentary rock, broken bits of sedimentary, igneous, and metamorphic rocks get deposited in layers and bonded together.

So, option d. is correct.

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Answer:

A theory doesn’t change into a scientific law because of new or better evidence.

Explanation:

A theory will always remain a theory, and i law will remain a law. The reason being that theories and laws may differ on account of newfound countervailing evidence. Remember, theories and laws are very different from hypotheses.

Answer:

A good society has a transparent talk, they share all matters related to the society, hence everyone knows what's going on. This is why collectiveness leads to a good society.

If my answer helped, kindly mark me as the brainliest!!

Thank You!!

CH4 + 2 O2 = CO2 + 2 H2O

i believe it's this :p

Answer:

15.28 mL

Explanation:

From the question given above, the following data were obtained:

Molarity of stock solution (M₁) = 4.5x10¯⁴ M

Volume of diluted solution (V₂) = 275 mL

Molarity of diluted solution (M₂) = 2.5×10¯⁵ M

Volume of stock solution (V₁) needed =.?

The volume of the stock solution needed can be obtained by using the dilution formula as illustrated below:

M₁V₁ = M₂V₂

4.5x10¯⁴ × V₁ = 2.5×10¯⁵ × 275

4.5x10¯⁴ × V₁ = 0.006875

Divide both side by 4.5x10¯⁴

V₁ = 0.006875 / 4.5x10¯⁴

V₁ = 15.28 mL

Therefore, the volume of the stock solution needed is 15.28 mL

Answer:

In the modern periodic table, the elements are listed in order of increasing atomic number. The atomic number is the number of protons in the nucleus of an atom In a periodic table arranged in order of increasing

Answer:

It's B And if it is not, I help you to do more things that you need.

1. A neutron outside a nucleus decays into a proton, electron, and antineutrino: This process is known as beta decay, and it is governed by the weak nuclear force. The weak nuclear force is responsible for interactions involving particles that undergo radioactive decay, such as the transformation of a neutron into a proton.

2. Protons and neutrons attract each other in a nucleus: This is the result of the strong nuclear force, also known as the strong interaction. The strong force is responsible for binding protons and neutrons together within the atomic nucleus. It overcomes the electromagnetic repulsion between positively charged protons and holds the nucleus together.

3. The Earth pulls on the Moon: This is an example of gravitational interaction. Gravity is responsible for the attractive force between objects with mass. In this case, the Earth's gravitational pull is responsible for the Moon orbiting around it.

4. Protons in a nucleus repel each other: This is due to the electromagnetic force, which is responsible for interactions between charged particles. Protons, being positively charged, repel each other due to the electromagnetic repulsion. It is the electromagnetic force that prevents the nucleus from collapsing under the repulsive forces between protons.

Understanding the fundamental interactions helps us explain the behavior and interactions of particles at the atomic and subatomic level, providing insights into various natural phenomena and the structure of matter.

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Match the process with the fundamental interaction responsible for this process. - Protons in a nucleus repel each other. -The Earth pulls on the Moon. -Protons and neutrons attract each other in a nucleus. -A neutron outside a nucleus decays into a proton, electron, and antineutrino. with these : 1- The electromagnetic interaction 2- the gravitational interaction 3- The weak interaction 4- The strong interaction

The density of the sand sample is 1.59 g/cm3.a sample of sand has a mass of 50.3 g and a volume of 31.7 cm3

To calculate the density, divide the mass of the sample by its volume:

50.3 g / 31.7 cm3 = 1.59 g/cm3.

This result indicates that the sand sample has a density of 1.59 grams per cubic centimeter.

Density is an important physical property that can be used to identify a substance, as each substance has a unique density.

The density of a material can also be used to calculate the mass of a sample given its volume, or to determine the volume of a sample given its mass.The equilibrium constant of a reaction determined by "The molarity of products is divided by the molarity of reactants".

The proportion between the product concentration and the reactant concentration would be known as the equilibrium constant.

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The sand sample has a density of 1.59 g/cm3. A sample of sand weighs 50.3 g and measures 31.7 cm3 in volume.

Divide the sample's mass by its volume to determine its density: 50.3 g / 31.7 cm3 = 1.59 g/cm3.

This finding suggests that the density of the sand sample is 1.59 grammes per cubic centimetre.

Due to the fact that each material has a distinct density, density is a crucial physical characteristic that can be used to identify a substance.

The mass of a sample given its volume can also be calculated using the density of a substance, as can the volume of a sample given its mass.

The formula "The molarity of products is divided by the molarity of reactants" is used to calculate the equilibrium constant of a process.

The equilibrium constant would be the ratio of the product concentration to the reactant concentration.

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Answer:

Neutral

Explanation:

Neutralization reaction gets its name from the fact that the products of the reaction are _____.

neutral

Hydrofluoric acid/Formula

______________________

HF

______________________

o0o0o0o0o0o0o0o0o0o0o0

Answer:

C

Explanation:

Answer: c

Explanation:

An unexpected color change is not a sign that a chemical change has occur. Thus option c is correct.

A chemical change is defined as the transformation of one material into another, the formation of new materials with different properties, and the formation of one or more new substances.

There are basically five types of chemical reaction.

Thus, an unexpected color change is not a sign that a chemical change has occur. Thus option c is correct.

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The given equation is not a balanced chemical equation as the mass of atoms on the both reactant and product side is not equal. Therefore, this equation does not demonstrate the law of conservation of matter.

A chemical equation can be defined as the representation of a reaction with help of symbols of the substances. A chemical equation includes of reactants participating and formed products separated by an arrow in the equation.

The chemical equation in which the mass of reactants is equal to the mass of the products is called a balanced chemical equation. For that, the law of conservation of mass should be followed by a balancing of a chemical equation which says that the mass can neither be created nor destroyed.

The given chemical equation of silver oxide is:

\(Ag_2O\longrightarrow Ag+O_2\)

The number of atoms of silver and oxygen is not equal on both sides.

The balanced chemical equation will be for the above reaction:

\(2Ag_2O\longrightarrow 4Ag +O_2\)

and this equation demonstrates the law of conservation of matter.

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Answer:

3rd answer - It is equal to the protons in a neutral atom.

Explanation:

Always,

No. of protons = No. of electrons

Therefore, we can conclude that the answer is the 3rd answer.

A chemical compound is created when metals and nonmetals mix in a specific ratio. AlCl3 is the compound that will be created from elements in groups 13 and 17.

A chemical compound is made up of several related molecules (or molecular entities), each of which has atoms from various chemical elements and is joined by chemical bonds. A molecule is not a compound because it is made up of only one element's atoms. A chemical reaction can convert one element into another and may involve interactions with other molecules. In the course of this process, atom-to-atom bonds may form or break.

Using the common chemical symbols with numerical subscripts, a chemical formula defines the number of atoms of each element in a compound molecule. The Chemical Abstracts Service has given a lot of chemical compounds a special CAS number that serves as an identification. More than 350,000 chemical compounds (including chemical combinations) have been registered for manufacturing and use globally.

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The end point in a titration of a 25.00 mL aq H₂SO₄ was reached by addition of 33. 87 ml of 0.4500 m NaOH. The molarity of H₂SO₄ is 0.3048 M.

The balanced chemical reaction is given as,

2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O

For exact neutralization of Va(mL) of an acid having Molarity Mₐ and basicity Nₐ by V(b) ml of a base having molarity M(b) and acidity N(b).

N(a) M(a) V(a) = N(b) M(b) V(b)

For H₂SOy basicity ,n(a) = 2

For NaOH acidity n(b) = 1

Va (H₂SO₄) = 25.00 mL

Vb (NaOH) = 37.87 mL

Mb (NaOH) = 0.4500M 

Ma (H2S04) = ?

Substitute the values to get the value of Ma,

2 × Ma × 25 mL = 1 × 0.4500 M × 33.87 mL

⇒ Ma = (1 × 0.4500 M × 33.87 mL) ÷ 50

⇒ Ma = 0.3048 M

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Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\(n = \frac{N}{L} \\ \)

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

\(n = \frac{4.23 \times {10}^{25} }{6.02 \times {10}^{23} } \\ = 70.265780...\)

We have the final answer as

Hope this helps you

Answer:

copper cathodes are normally referred to when talking about copper. Cathode is the purest form of copper and is the feedstock used to produce copper wire, cable, sheet, strip, tube, etc.

Explanation:

Answer:

0.0125mol/dm³

Explanation:

Given parameters:

Mass of carbon dioxide  = 0.22g

Volume of water  = 400cm³

Unknown:

Concentration in mol/dm³ =  ?

Solution:

Concentration is the amount of solute dissolved in a solvent.

The formula is expressed as;

    Concentration  = \(\frac{number of moles}{volume}\)  

Number of moles  = \(\frac{mass}{molar mass}\)

       Molar mass of CO₂   = 12 + 3(16) = 44g/mol

Number of moles  = \(\frac{0.22}{44}\)   = 0.0005mol

Now,

             1000cm³  = 1dm³

             400cm³ = \(\frac{400}{1000}\)  = 0.4dm³

Insert the parameters and solve;

     Concentration  = \(\frac{0.005}{0.4}\)  = 0.0125mol/dm³

Answer:

The two factors that determine whether a reaction is spontaneous are:

Enthalpy: When the reaction gives off energy, then the reaction is said to be spontaneous.

Entropy: It is the measure of randomness in a system. As the randomness of the reaction increases, the spontaneous is the reaction.

That's it

Hope's It's Help

Answer:

STP is 101.325 kPa pressure and 273K temperature

Also, at STP, 1 mol of an ideal gas = 22.4 L

Since the question states that 22.4 L are needed at STP, we know that ONE MOLE is needed.  Now, the question is, how many moles are actually present?

V = 25.0 L

P = 101.5 kPa

T = 373K

n = ?

R = 8.31 L-kPa/Kmol

Solving the ideal gas law for n (moles) and comparing that to 1 mole, we have...

n = PV/RT = (101.5)(25.0)/(8.31)(373)

n = 0.82 moles of gas.  THIS IS NOT ENOUGH as it is less than the ONE mole required.

Explanation:

In order to convert to Kelvin we add 273 to the Celsius measurement as we know that 0 degree Celsius is equal to 273Kelvin.

Celsius (°C) and Kelvin (K) are both units of temperature measurement. The difference between the two is that Kelvin is an absolute scale, and Celsius is a relative scale. Kelvin scale is an absolute temperature scale, which means that it starts at absolute zero. Absolute zero is defined as 0 Kelvin, or -273.15 Celsius. Therefore, to convert from Celsius to Kelvin, you add 273.15 to the Celsius measurement.

For example, if the temperature is 100 degree Celsius, then to convert it to Kelvin, you would add 273.15 to 100, which would give a result of 373.15 Kelvin.

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Answer:

The density of helgas sample is 17.8 g/cm³.

Explanation:

Given that,

Mass of sample of Rowena = 5 gram

Density = 8.9 g/cm³

Mass of sample of helga = 10 gram

We need to calculate the volume of sample

Using formula of volume

\(V=\dfrac{m}{\rho}\)

Where, m = mass

\(\rho\) = density

Put the value into the formula

\(V=\dfrac{5}{8.9}\)

\(V=0.56\ cm^3\)

We need to calculate the density of helgas sample

Using formula of density

\(\rho=\dfrac{m}{V}\)

Where, m = mass

V = volume

Put the value into the formula

\(\rho=\dfrac{10}{0.56}\)

\(\rho=17.8\ g/cm^3\)

Hence, The density of helgas sample is 17.8 g/cm³.

Answer:

It is noticed that after five days, there is elongation of the root cells in the roots of onion in the jam bottle

Explanation:

It is noticed that after five days, there is elongation of the root cells in the roots of onion in the jam bottle. The growth of a plant is due to the availability of the growing and  dividing cells in the meristematic regions of the apical meristems. (stem cells). This site are active site for elongation and differentiation  of the stem tissues. In the apical meristem of the root cells, the cells have the potential to carry out mitosis and cell division repeatedly in order to generate newer cells for extension and development of stems and leaves. With each cell division, one cell remains in the meristem which the other increases in size and differentiate due to different genomic expression to form the meristem regions which eventually becomes the stem structure.

Answer: a substance whis lose hydrogen

Explanation:

Answer:

have a full outer electron shell

Explanation:

Answer:

d

Explanation:

A: mass never increases or decreases. It is a value that is the same everywhere in the universe. A is not correct.

B: it can be but that is not the only unit that can be used

C: A spring scale measures force not mass.

D: The answer to this question is D if the word at the end is balance.