Write the electronic configuration of calcium and potassium.​

Answer:

E-shared

A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms.

Answer:

2.95 * 10^23 atoms

Explanation:

The number of atoms in a mole is always equal to Avogadro's constant, which is 6.02214076×10²³ mol⁻¹.

To find the number of atoms in 0.490 moles of barium, multiply it with Avogadro's constant:

0.490 mol * 6.02214076×10²³ mol⁻¹ ≈ 2.9508 * 10^23

Convert to SigFigs (if necessary):

2.95 * 10^23

Answer:

Number 1 is wrong it doesn't change the mass

Chemical bonding may involve any of the following except the " change in mass in a chemical reaction".

A chemical reaction is referred to as a process which it involves the chemical change of one set of chemical compounds into yet another set of chemical substances.

A molecule and compound's atoms, ions, and groups of atoms are held together by an attractive force, referred as chemical bond.

Chemical bonding may involve any of the following except the " change in mass in a chemical reaction".

Therefore, the correct answer will be option 1.

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the answer is Te because O is oxygen.

Answer:

O

Explanation:

this is because it is oxygen

Answer:

Terylene

Explanation:

Answer: she or his is right the Terylene is a popular polyester which is used in dress materials. PET (Poly Ethylene Terephthalate) is another example of polyester.M

Explanation:

Hope it helps

Answer:

The ammonia has 10 times as many H+ ions as the bleach.

Explanation:

pH is defined as -log[H+]

[H+] of ammonia is = 10^-12 = 1x10-12M

Bleach = 1x10-13M

pOH = 14-pH = 2 for ammonia and 1 for bleach

[OH-] = 10^-pOH = 0.01M for ammonia and 0.1M for bleach

Thus:

The ammonia has 10 times as many OH- ions as the bleach. FALSE.

The ammonia has 10 times as many H+ ions as the bleach. TRUE.

A solution that could buffer the bleach and ammonia would remove excess OH- ions. FALSE. A buffer maintains OH- ion concentration

Both of these substances are strong acids. FALSE. Strong acids have pHs < 7

Answer:

A scientific question to be asked is; What is the average speed of the toy car?

Explanation:

A scientific question is a question which is well defined, the values in the question can be measured, and the inputs and outputs related to the question are controllable

The parameters measured in the experiment are;

The time elapsed during the movement of the car, Δt

The distance the car moves, d

From the obtained measurements, the value can be calculated is the average speed of the toy car as follows;

[tex]The \ average \ speed \ of \ the \ toy \ car, \ v_{avg} = \dfrac{d}{\Delta t}[/tex]

Therefore, a scientific question to be asked that will be answered by doing the experiment is; What is the average speed of the toy car?

Answer:

Sample Response: How can we change the speed of a toy car on a racetrack to describe the car’s motion?

What did you include in your question? Check all that apply.

a focus on describing the toy car’s motion

a suggestion for a way to change the car’s motion

room for observations and an opportunity to look at motion objective

Explanation:

Answer: The mass of water produced is 44.28 g

Explanation:

We are given:

Volume of oxygen gas = 27.50 L

At STP conditions:

22.4 L of volume is occupied by 1 mole of a substance

27.50 L of oxygen gas will be occupied by = [tex]\frac{1mol}{22.4L}\times 27.50L=1.23mol[/tex]

The chemical equation for the formation of water follows:

[tex]2H_2+O_2\rightarrow 2H_2O[/tex]

By the stoichiometry of the reaction:

If 1 mole of oxygen gas produces 2 moles of water

So, 1.23 moles of oxygen gas will produce = [tex]\frac{2}{1}\times 1.23=2.46mol[/tex] of water

The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] ......(1)

Molar mass of water = 18 g/mol

Plugging values in equation 1:

[tex]\text{Mass of water}=(2.46mol\times 18g/mol)=44.28g[/tex]

Hence, the mass of water produced is 44.28 g

Answer:

A

Explanation:

because B is wrong as it doesn't have the same mass number. C is wrong as it has different number of neutrons. D is wrong as it has more neutrons than protons.

Answer: C4H10

Explanation: [tex]\left \{ {{12x+y=58} \atop {\frac{12x}{58} =82,8%}} \right. \\[/tex]%

==> x=4, y=10    C4H10

Answer:

–87.3 KJ.

Explanation:

The equation for the reaction is given below:

H₂(g) + ½O₂(g) —> H₂O(l) ∆H = -285.8 kJ

Next, we shall determine the mass of H₂O produced from the balanced equation. This can be obtained as follow:

Molar mass of H₂O = 18 g/mol

Mass of H₂O from the balanced equation = 1 × 18 = 18 g

SUMMARY:

From the balanced equation above,

When 18 g of H₂O was produced, ∆H was –285.8 KJ.

Finally, we shall determine ∆H when 5.5 g of H₂O is produced. This can be obtained as illustrated below:

From the balanced equation above,

When 18 g of H₂O was produced, ∆H was –285.8 KJ.

Therefore, 5.5 g of H₂O will produce ∆H of = (5.5 × –285.8) / 18 = –87.3 KJ

Thus, the ∆H when 5.5 g of H₂O was produced is –87.3 KJ.

The amount of sulfur emitted by a smokestack before and after the scrubber is attached.

Hope it helps you I'm from ph❤️

Answer:

Ozon prevents us from UV rays of the sun. Ozone hole means that UV rays are entering the Earth. This results in cancer.

Explanation:

Chlorofluorocarbons are causing this

Answer:

The term ‘ozone hole’ refers to the depletion of the protective ozone layer in the upper atmosphere (stratosphere) over Earth's polar regions. People, plants, and animals living under the ozone hole are harmed by the solar radiation now reaching the Earth's surface—where it causes health problems, from eye damage to skin cancer.

Ozone depletion occurs when chlorofluorocarbons (CFCs) and halons—gases formerly found in aerosol spray cans and refrigerants—are released into the atmosphere.

Answer: B) You are to continue heating the round-bottom flask until all liquid has been distilled.

Explanation:

Fractional distillation refers to a method that's useful for the separation of mixtures of solvents whereby there is less than 40°C in the boiling point difference.

With regards to the options given, the incorrect statement about the procedure for distillation is that you are to continue heating the round-bottom flask until all liquid has been distilled. This isn't correct.

Amino acids are the monomers that make up proteins. Each amino acid has the same fundamental structure , which consists of a central carbon atom, also known as the alpha (α) carbon, bonded to an amino group (NH2), a carboxyl group (COOH), and to a hydrogen atom.

Amino group, R group, and the carboxylic acid group. Hence, option B is correct.

Amino acids are the monomers that makeup proteins.

Each amino acid has the same fundamental structure, which consists of a central carbon atom, also known as the alpha (α) carbon, bonded to an amino group (NH2), a carboxyl group (COOH), and to a hydrogen atom.

Hence, option B is correct.

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Answer:

false

Explanation:

edge 2022

Answer:

MgCO3 + 2 NaNO3

Explanation:

Answer:

alkenes

Explanation:

The general formula for alkenes is CnH2n

A. build proteins

Explanation:

The endoplasmic reticulum can either be smooth or rough, and in general its function is to produce proteins for the rest of the cell to function. The rough endoplasmic reticulum has on it ribosomes, which are small, round organelles whose function it is to make those proteins

Answer:

Find the area of each face that you see and then multiply each area by two to account for the face on the opposite side.

Answer:

1.

(NH4)2Cr2O7——>Cr2O7+N2+4H2O

2.

6CO2+6H2O——>C6H12O6+6O2

Answer:

you will produce a saturated solution, At 0 degrees Celsius, sugar is claimed to dissolve 180 grams in 100 grams of water. This means that if you dissolve that much sugar in 100 g of water, you'll get a saturated solution.

Explanation:

The correct answer for the given question about Saturated solution is only 72.5 gram will get dissolved and rest which is 27.5 gram will remain undissolved.

In question it is given that at 60° C 290 gram of sugar in 100 gram of water produce saturated solution.

So at 60° C  290/100 gram of sugar in 1 gram of water will produce saturated solution.

Hence we can say that  at 60° C  (290/100)×25 gram of sugar in 25 gram of water will produce saturated solution.

means at 60° C 72.5 gram of sugar in 25 gram of water will produce saturated solution.

Now, adding 100 gram of sugar in 25 gram of water.

Since you can only hope to dissolve 72.5 gram at 60°,

Hence the resulting solution will contain undissolved sugar.

So only 72.5 gram will get dissolved and rest which is 27.5 gram will remain undissolved.

Thus, We can conclude that Only 72.5 grams of sugar will dissolve, leaving the remaining  sugar of 27.5 grams undissolved.

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Answer:

B. Carbon and Hydrogen

Explanation:

An alkyne can be regarded as unsaturated hydrocarbon which have at least one carbon—carbon triple bond. They are acyclic aliphatic hydrocarbons, they can be (branched or unbranched) , They have general chemical formula of [ CₙH₂ₙ−2]. One of the compound belonging to this family is Propyne( C3H4) Hence, they contain Hydrogen and Carbon.

Alkenes can be regarded as class of hydrocarbons which posses only carbon and hydrogen, they are unsaturated compounds having least one carbon-to-carbon double bond.

alkenes can also be regarded as "olefins". one of the members of this family is Ethene (C2H4). general formula of alkenes can be written as [C nH 2n],

n=number of carbon atoms present in the molecule

Answer:

Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change.

Answer:

Change in Color

Heat is released (bubbles in solution)

Sometimes even a change in texture

A new smell

Formation of a precipitate