a chemical symbol is to an element as a chemical formula is to a

Answer:

A: It is used for the phase change.

Explanation:

During a phase change, the heat added or realeased, the temperature remains constant and is used to be stored as potential energy.

Side Note: I hope this helps, feel free to let me know if you have any other questions :)

Answer:

What happens to the Energy added during a phase change my anwar would be B

Answer:

There are 3 moles of atoms in one mole of BaCl2 .

Answer:

B. Litmus paper

Explanation:

The test for chlorine can use either type of litmus paper, but blue litmus paper is used most commonly. The litmus paper must be damp - the water dissolves some of the chlorine so that it can react with the indicator on the litmus paper. This test shows that chlorine is a powerful bleach.

The value of h in the right triangle is 7.7 cm.

Trigonometric ratio is used to show the relationship between the sides and angles of a right angled triangle.

In the right triangle, using trigonometric ratio:

a) sin(31) = h/15

⇒ 0.515 = h/15

Making H the subject of the formula we have:

0.515 x 15 = h/15  x 15

h = 7.725

h \(\approx\) 7,7

Hence, is is correct to state that the value of h in the diagram is 7.7 cm approximately. See the attached image.

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Full Question:

Although part of your question is missing, you might be referring to this full question:

the diagram shows a right-angled triangle. what is the value of h? give your answer correct to 1 decimal place.

Answer:

I think it's A and C. Please tell me if I am wrong.

Explanation:

Answer:

Alright so I did this quiz a while ago it's A and C now could i have brainliest?

Explanation:

Answer:

graph a shows acceleration and b does not

Explanation:

the velocity increases in graph a, but stays constant in graph b

Answer:

graph a shows acceleration and b does not

Explanation:

Answer:

approximately 251.55 grams of AuCl3 would contain 5.0 x 10^23 molecules.

Answer:

The other may not be free.

Explanation:

In the polymer-supported reaction with methanol, the reaction will undergo at one hydroxyl group because others may not be free due to bonding with other molecules. The hydroxyl groups could be bonded with the polymer with the help of hydrogen bonding of molecules. The hydroxyl group has to be bonded to only the compatible molecules and free molecules.

We have that this is because of Chemoselective reaction where one functional group reacts before or in the presence of another.

Generally, A hydroxy is a group with there chemical formula represented as -OH,  and are made up of one oxygen atom in a covalent bond with one hydrogen atom.

In polymer supported response of an alcohol with methanol selectively bear response at one hydroxy to the fact the every other hydroxy can also now not be free due to it may additionally linked with the polymer via H-bonding.

Therefore, Chemoselective reaction where one functional group reacts before or in the presence of another.

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Answer:

To solve these problems, we can use the formula:

q = mcΔT

where q is the heat transferred, m is the mass of the substance, c is the specific heat capacity of the substance, and ΔT is the temperature change.

The mass of the sample of tin can be calculated as:

q = mcΔT

36298 J = m × 0.227 J/(g.°C) × (-160.56 °C)

m = 708.2 g

The temperature change of the sample of ammonia can be calculated as:

q = mcΔT

33834 J = 13.66 mol × 80.08 J/(mol.°C) × ΔT

ΔT = 31.7 °C

The mass of the sample of cobalt can be calculated as:

q = mcΔT

455500 J = m × 0.4187 J/(g.°C) × (-1132.52 °C)

m = 27.4 g

The specific heat capacity of indium can be calculated as:

q = mcΔT

12505 J = 372.4 g × c × 140.73 K

c = 0.238 J/(g.°C)

The temperature change of the sample of molybdenum can be calculated as:

q = mcΔT

35961 J = 4.721 mol × 24.06 J/(mol.°C) × ΔT

ΔT = 31.9 °C

The heat transferred by the sample of ethanol can be calculated as:

q = mcΔT

q = 56.2 g × 2.44 J/(g K) × (-110.56 K)

q = -15,585 J

The temperature change of the sample of chromium can be calculated as:

q = mcΔT

38674 J = 5.774 mol × 23.35 J/(mol.°C) × ΔT

ΔT = 27.4 °C

The heat transferred by the sample of magnesium can be calculated as:

q = mcΔT

q = 1.008 mol × 24.9 J/(mol K) × (-683.83 K)

q = -17,134 J

The heat transferred by the sample of tin can be calculated as:

q = mcΔT

q = 0.2687 mol × 27.112 J/(mol K) × 222.48 K

q = 1676.7 J

The specific heat capacity of neon can be calculated as:

q = mcΔT

14738 J = 1.008 mol × c × (-703.43 K)

c = 36.8 J/(mol.°C)

Explanation:

To find the amount of gas in moles, we can use the Ideal Gas Law, which states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

Rearranging the equation to solve for n, we get:

n = PV / RT

Plugging in the given values, we get:

n = (2 atm) * (20 L) / (8.31 J/mol*K * 400 K)

Converting atm to Pa:

n = (2 * 101325 Pa) * (20 L) / (8.31 J/mol*K * 400 K)

Converting liters to cubic meters:

n = (2 * 101325 Pa) * (0.02 m^3) / (8.31 J/mol*K * 400 K)

Solving the equation:

n = 0.077 mol

So there are approximately 0.077 moles of gas in the 20-liter container at a pressure of 2 atm and a temperature of 400 K.

There are 7 unpaired electrons in [Ni(NH\(_3\))\(_6\)]\(_3\)⁺. The elementary electric charge of the electron is a negative one, making it a subatomic particle.

The elementary electric charge of the electron is a negative one, making it a subatomic particle. Due to their lack of components or substructure, electrons, which are part for the lepton particle family's first generation, are typically regarded to be elementary particles.

The mass of an electron is roughly 1/1836 that of a proton. The electron has a half-integer inherent angular momentum (spin) that is described in terms of the shortened Planck constant,, among its quantum mechanical features.  There are 7 unpaired electrons in [Ni(NH\(_3\))\(_6\)]\(_3\)⁺.

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Answer:

You could color it different. Explain in a picture the difference. There are so many different variety's.

Explanation:

Answer: 16 different air molecules

Explanation: jhit smart

Answer:

Answer:

0.38

Explanation:its right bc it is

Answer:

2.342*10^23

Explanation:

# of molecules = Moles * NA

# of molecules = (Mass in grams) / (Molar Mass) * NA

Molar Mass of H2O = 18g/mol

Avogadro's number(NA) = 6.022*10^23

Now,

# of molecules = (7g/18gmol)*(6.022*10^23) = 2.342 * 10^23

Answer:

It cannot be both, because the heat released or absorbed is also equal to the difference in total heat content of the reactants and products. So, it cannot be both.

Answer:

B

Explanation:

Answer:

Ball and stick models give us a view of the three dimensional arrangement of atoms in a molecule. It provides sufficient information regarding the relative positions of the atoms, types of bonds, bond angles and distances. Since we cannot physically see a molecule, this way it is the closest we can get to visualise how a molecule looks like.

The balls represent atoms, their colour code and size represent specific elements, while the sticks give us idea about the length, type and directional disposition of bonds. The models also help us to understand all the nuances of stereochemistry including variations in conformational structures.

Explanation:

Answer:

C. it shows how parts of the molecule are arranged in relation to one another.

B. It represent an object too small to be observed directly.

Explanation:

it is

The extra adrenal effect of the adrenal cortex is the secretion of cortisol and adrenal androgens.

Cortisol is a steroid hormone produced by the adrenal gland, and it is essential for many bodily functions, including the body’s response to stress. The production of cortisol is regulated by the hypothalamic-pituitary-adrenal axis. Adrenal androgens are male hormones, such as testosterone, produced by the adrenal cortex. They are important for the development of male reproductive organs and male secondary sexual characteristics, such as facial hair and a deeper voice. In addition, these hormones play a role in the regulation of metabolism and energy levels.

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Answer:

Explanation:

Here, we want to get the most ionic fluoride

Cs is a group 1 element, same as sodium

However, we know that electropositivity increases down the group while electronegativity decreases down the group

Also, electropositivity decreases across the period. It is expected that a group 1 element will be more electropositive than a group 3 element.

Thus, we are having a bond between a very electropositive metal and a very electronegative non-metal. That is why we have CsF (it is the strongest and most electropositive atom in the options listed) as the molecule with the strongest ionic bond on the list

Answer:

to make it basic from acidic

The electrical charge of the nucleus of an atom is +12 then 12 electrons does the atom have in its neutral state

Basic property of matter carried by some elementary particles that governs how the particles are affected by an electric or magnetic field and when a neutral atom gains or loses electrons, it becomes an ion and heavier atoms tend to have more neutrons than protons, but the number of electrons in an atom is always equal to the number of protons and so an atom as a whole is electrically neutral

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Answer:

\(\Delta T=1.286\°C\)

\(m=2.51mol/kg\)

\(n=0.0503mol\)

\(M=59.8g/mol\)

Explanation:

Hello,

In case, for the boiling point raise we can write:

\(T_2-T_1=imK_b\)

Whereas T2 accounts for the boiling point of the solution which is 101.286 °C, T1 the volume of pure water which is 100.000 °C, i the van't Hoff factor that for this problem is 1 due to the solute's non-volatility, m the molality of the solute and Kb the boiling point constant that is 0.512 °C/m. In such a way, the change in the temperature is:

\(\Delta T=T_2-T_1=101.286\°C-100.000\°C=1.286\°C\)

The molality is computed from the boiling point raise:

\(m=\frac{T_2-T_1}{Kb}=\frac{1.286\°C}{0.512\°C/m}\\ \\m=2.51mol/kg\)

The moles are computed by multiplying the molality by the kilograms of water as the solvent (0.02002g):

\(n=2.51mol/kg*0.02002kg\\\\n=0.0503mol\)

And the molecular mass by dividing the mass of the solute by its moles:

\(M=\frac{3.005g}{0.0503mol}\\ \\M=59.8g/mol\)

Best regards.

Answer:

a liquid

Explanation:

The dependent variable in this case is the length of the cattails while the independent variable is the volume of water received.

An experiment is a carefully controlled study which establishes a cause and effect relationship between variables. There must be a dependent variable and an independent variable.

The dependent variable in this case is the length of the cattails while the dependent variable is the volume of water received. The control group is the group that did not receive any water.

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Answer:

approximately 15.1 grams.

Explanation:

The key to chemistry is to change everything to moles. Then when you have the answer in moles change the answer back to grams, liters, or whatever you want.

change 25 grams of potassium chlorate to moles.

calculate the gram molecular mass of potassium chlorate.

Chlorate is Cl with 3 oxygens. ate = saturated. Chlorine has seven valance electrons when it is saturated six of these electrons are used by oxygen ( 2 electrons per oxygen) leaving only 1 electron.

1 K x 39 grams/mole

+1 Cl x 35.4 grams/ mole

+3 O x 16 grams/ mole

= 122.4 grams / mole Potassium Chlorate

25

122.4

= moles.

2.05 moles of Potassium Chlorate.

There is a 1:1 mole ratio. 1 mole of Potassium Chlorate will produce 1 mole of Potassium Chloride.

2.05 moles of Potassium Chlorate will produce 2.05 moles of Potassium Chloride.

Find the gram molecular mass of Potassium Chloride.

1 K x 39 = 39

+1 Cl x 35.4 = 35.4

= 74.4 grams / mole.

2.05 moles x 74.4 grams/ mole = 15.2 grams

Answer:

idont know nalimotan ko hhhh...