In a chemical equation, which symbol should be used to indicate that a substance is in solution?
(s)
(g)
оооо
(ag)

The (m/m%) concentration of ethanol is the solution is 5.55%.

The density of the solution is given to be 1.20 g/ml. The volume of the solution is 750 ml.

We know,

Density = mass/volume

Mass of solution = Density of solution x Volume of solution

Mass of solution = 1.2 x 750

Mass of solution = 900 grams.

The mass of solute, ethanol is 50 grams.

So, (m/m%) of ethanol is,

(m/m%) of ethanol = Mass of ethanol/mass of solution x 100

(m/m%) of ethanol = 50/900 x 100

(m/m%) of ethanol = 5.55%.

So, the (m/m%) of ethanol is 5.55%.

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Answer:

32 gm O

Explanation:

there are 16 gm of O in each 18 gm of water ....the other two grams are H

so there would be 32 gm of oxygen in 36 gm water

Answer:

Two ions that produced similar colors in the flame test were Ca+2 and Sr+2. 3.

Explanation:

The colors are produced when an electron jumps to a higher level and then jump back down.

Ba2+ and Cu2+ and Sr2+ and Li+ were the pair with the similar color. Sr and Li displayed red colors, while Ba and Cu had mild greenish yellowish hues.

Why do some ions in the flame test generate colors that are similar?

The precise sizes of the potential energy jumps differ from metal to metal. As a result, the flame color of each metal will differ due to its unique spectral line pattern. The movement of the electrons in the metal ions contained in the compounds results in the hues of the flame.

The energy released by each electron when it returns to its initial condition determines the hue of the light that is produced.

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Answer:

A process during which chemical bonds between atoms are broken and new ones are formed, producing one or more substances.

Moles are the amount of substance that contains as many particles.

Explanation:

A chemical reaction is when a chemical change occurs for example when a nail comes into contact with air and is then exposed to air it begins to rust. It forms a red-brown substance which changes the chemical composition of the original compound.

Examples of chemical reactions:

Combustion

Oxidation (rusting)

Cooking an egg

Photosynthesis

Digestion

Fireworks

Paper Burnin

The mole is the amount of substance that contains as many particles (molecules, ions or atoms) as there are in 12g of carbon.

1 mol is the amount of substance that contains the same number of particles as there are atoms in 12.0 g of carbon-12 and that number is referred to as Avogardo's constant (6.022 x \(10^{23}\)).

Answer:

Yellow

Explanation:

The color of the equilibrium mixture of Iodine Monochloride and Chlorine is yellow. When the mixture is heated, it becomes darker brown in color.

Answer:

¿Cuál será el pH de una disolución saturada de hidróxido de cinc?.

Explanation:

Dato: Kps (Zn(OH)2) = 1,8 x 10-14. Solución: 9,52.

The molar solubility in water of Ag₂CrO₄ is 2.52 * 10⁻⁴ M .

The measure of the degree to which a substance gets dissolved in a solvent to become a solution.

The formula for determination of molar solubity is

\(\rm K_{sp} = [A^+]^a [B^-]^b\)

\(\rm K_{sp}\)          = solubility product constant

\(\rm [A^+]^a\)  =     cation in an aqueous solution

\(\rm [B^-]^b\)  = anion in an aqueous solution

a, b          = relative concentrations of a and b

We have the data given as

\(\rm K_{sp}\) for Ag₂CrO₄ is 8 x 10⁻¹²

For Silver chromate , the solubility would be only one-half of the Ag⁺ concentration.

We denote the solubility of Ag₂CrO₄ as S mol L⁻¹.

Then for a saturated solution, we have

[Ag⁺]=2S

[CrO₂⁴⁻]=S

the relation between the solubility and the solubility product constant depends on the stoichiometry of the dissolution reaction

(2S)²(S)=4S³ = 8 * 10⁻¹²

S=∛ (2*10⁻¹²)

S= 1.26 * 10⁻⁴ M

2S = 2.52 * 10⁻⁴ M

Therefore the molar solubility in water of Ag₂CrO₄ is 2.52 * 10⁻⁴ M .

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The chloride ion's ground state electron configuration is [Ne] 3s2 3p6.

An atom of chlorine that has lost one electron and now has a net charge of -1 is known as a chloride ion.

The chloride ion contains 16 electrons overall due to the loss of one electron from the chlorine atom, which has 17 protons in its nucleus.

The chloride ion's atomic structure resembles that of a chlorine atom, but one electron from the 3s orbital is missing.

The chloride ion now has an electron configuration of [Ne] 3s2 3p6, with the 3s orbital having two electrons and the 3p orbital having six.

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Answer:

7.5g/mL

Explanation:

Density = Mass/Volume

             = 150.0g/20.0mL

             = 7.5g/mL

Temperature stays the same during state of matter change. After plotting the graph of temperature vs time and the curve is outlined, the moment the graph plateaus read the temperature that is constant(repeatedly occurs).

From the points given in the table of value, am sure the melting point is 78°C.

All the best!

Answer:

5.40 moles ( to 3 signif digits )

Explanation:

ONE mole is Avagadro's Number   6.022 x 10^23  atoms/mole

3.25 x 10^24 atoms / (6.022 x10^23 atoms/mole ) = 5.396 moles ~ 5.40 moles

Answer:

Sodium chloride will conduct electricity only when it is in a liquid state or in solution, this is because the ions are free to move in this state, allowing them to carry charge and conduct electricity.

Explanation:

hopely it helps

The factor that make the climates different at Missoula, MT and Cape Elizabeth, ME is C. altitude and proximity to large bodies of water.

Missoula, MT is located in a high-altitude region and is far from large bodies of water, which results in a continental climate with cold winters and hot summers.

Cape Elizabeth, ME is located at a lower altitude and is near the Atlantic Ocean, which results in a maritime climate with mild winters and cool summers.

In conclusion, one of the factors that endures that the climates in Missoula and Cape Elizabeth, is the altitude as well as how close they are to oceans.

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Making balloon animals by twisting and tying balloons is an example of how gases have the potential to take on the shape of their container.




"Conformability" or "fluidity" are terms used to describe this characteristic of gasesThe tiny particles that make up gases are always moving randomly and filling the full volume of the container in which they are contained. This characteristic allows balloons to be filled with gas that takes on the shape of the balloon, which allows them to be inflated and moulded into a variety of shapes.In contrast, the shape and volume of solids and liquids are fixed, and their particle arrangement is more symmetrical and tightly packed than that of gases. Gases' capability toThe tiny particles that make up gases are always moving randomly and filling the full volume of the container in which they are contained. This characteristic allows balloons to be filled with gas that takes on the shape of the balloon, which allows them to be inflated and moulded into a variety of shapes.In contrast, the shape and volume of solids and liquids are fixed, and their particle arrangement is more symmetrical and tightly packed than that of gases. Gases are useful in a variety of applications, including inflating balloons, powering motors, and storing and carrying items, due to their capacity to adapt to the shape of their container.

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Answer: I am thankful for daytime since it can help us see, go outside for a walk, meet people clearly, do outdoor activities, and all the other things we do during day time.

NIGHT: I am thankful that there is night because we can have a proper sleep, and a slight cooling breeze. It can help us sleep more which is important because sleep can help us learn and focus. It gives us energy to start the day for tomorrow.

Explanation:

The number of atoms corresponding to the molecule is in the lower part of the atoms, when there is no number it will mean that the atom is present only once.

So, we have that in one molecule of NH4 there will be:

Outside the parentheses we see that there is a number two (NH4)2, this means that there are two molecules of NH4.

So we have:

And we have outside the molecule an atom of S

So, we have in total:

The answer will be the last one, 2-N, 8-H, 1-S

Answer:

melting point

Explanation:

An electron accelerates when it decelerates from a higher to a lower energy level. We are aware that charged particles in acceleration emit energy as electromagnetic radiation.

An atom is a discrete piece of matter that uniquely describes a chemical element. An atom's core nucleus is surrounded by one or more negatively charged electrons, it is made up of all of them. The positively charged nucleus contains one or more protons and neutrons, which are relatively heavy particles.

An electron moves from one energy level to another, absorbing energy in the process. When an electron changes from one energy level to another, energy is released (often as light).

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Answer:

electrical energy

When the flashlight is turned on, the chemical energy is first transformed into electrical energy and then into light energy. CHEMICAL bonds. It is released during a chemical reaction (change). by flowing electrons (negatively charged particles).

Answer:

Electrical Energy

Explanation:

When the flashlight is turned on, the chemical energy is first transformed into electrical energy and then into light energy. CHEMICAL bonds. It is released during a chemical reaction (change). by flowing electrons (negatively charged particles).

The balanced nuclear equation for the formation of 241Am-95 through β− decay can be represented as follows: 94Pu-241 → 95Am-241 + -1e0

In this β− decay process, a neutron in the nucleus of 241Pu-94 is transformed into a proton, while simultaneously emitting an electron (β− particle) and an antineutrino. This leads to the formation of 241Am-95. The atomic number (Z) of the parent nucleus increases by one, resulting in the formation of a new element, americium (Am), with atomic number 95. The mass number (A) remains the same, indicating that the total number of nucleons (protons and neutrons) in the nucleus is conserved. The -1e0 in the equation represents the β− particle emitted during the process.

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Answer:

16

Explanation:

2 per molecule X 8 molecules in total

Best describe table sugar is considered a pure substance is Sugar has the same chemical composition throughout

Table sugar is pure sucrose derived from sugar beet or sugar cane and sucrose is the disaccharide consisting of glucose and fructose and it is produced by green plant in the process of photosynthesis and since the chemical composition of sugar is definite and does not vary hence it is pure substance and table sugar refer to standard while white sugar that you see in your cooking baking or cup of tea at home and the scientific name foe table sugar is sucrose

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Answer:

The answers are B and D.

Explanation:

This is because neutralisation process that contain sodium, potassium and ammonium will produce salt and water.

The volume of the 1.45 kg of green liquid that has the same density as the yellow solution, whose mass and volume are 357g and 211 cm³, respectively, is 858.0 cm³.  

The volume of the green liquid can be found with the equation of density:

\( d = \frac{m_{g}}{V_{g}} \)

Where:

d: is the density of the green liquid

\(m_{g}\): is the mass of the green liquid = 1.45 kg = 1450 g

\(V_{g}\): is the volume of the green liquid =?

Since the density of the green liquid is the same that the density of the yellow solution, we have:

\( d = \frac{m_{y}}{V_{y}} = \frac{357 g}{211 cm^{3}} = 1.69 g/cm^{3} \)

Now, the volume of the green liquid is:

\( V_{g} = \frac{m_{g}}{d} = \frac{1450 g}{1.69 g/cm^{3}} = 858.0 cm^{3} \)

Therefore, the volume of the green liquid is 858.0 cm³.

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Answer:

Warm equatorial air rises higher into the atmosphere and migrates toward the poles. This is a low-pressure system. At the same time, cooler, denser air moves over Earth's surface toward the Equator to replace the heated air. ... This happens because Earth's rotation generates what is known as the Coriolis effect

The pressure produced when the temperature is raised to 327 °C assuming that the volume is held constant is 180 KPa.

The force that the gas applies to the container boundaries is known as the gas's pressure. Along the designated volume, the gas molecules move at random. They bump into the ground and each other throughout this movement. The impact of every individual gas molecule is too little and difficult to visualise.

Initial pressure (P₁) = 120 KPa

Initial temperature (T₁) = 127 °C = 127 + 273 = 400 K

New temperature (T₂) = 327 °C = 327 + 273 = 600 K

Volume = Constant

New pressure (P₂) = ?

P₁V₁ / T₁ = P₂V₂ / T₂

Volume = contant

P₁ / T₁ = P₂ / T₂

120 / 400 = P₂ / 600

Cross multiply

P₂ × 400 = 120 × 600

P₂ × 400 = 72000

Divide both sides by 288

P₂ = 72000 / 400

P₂ = 180 KPa

The pressure is 180 KPa.

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Answer:

All of the elements in a period have the same number of atomic orbitals. For example, every element in the top row (the first period) has one orbital for its electrons. All of the elements in the second row (the second period) have two orbitals for their electrons.

hope this helps

Explanation:

Elements in the same period are those that are in a single horizontal line from left to right. They do not share the same type of chemical reactivity as seen in groups. They only real thing that these elements share in common is the same principal quantum number, or main energy shell.

Answer T

Explanation:

Answer:

the VSEPR model utilizes electron-pair geometry (regions around the central atom) and molecular geometry (amount of lone pairs around the central atom–so whatever the electron-pair geometry is, you just count the amount of lone pairs in those regions).

Explanation:

No lone pairs around the central atom, the electron pair and molecular geometry would be the same. Bond angle differs depending on the electron pair geometry and molecular geometry you have for a molecule.

The VSEPR model is used to predict the shape of, and the bond angles in a molecule by counting the number of electron pairs on the valence shell of the central atom in the molecule.

The VSEPR model was introduced by Gillespie and Nyholm in 1957 to explain the shape of and bond angles of molecules.

The main point of the theory is that electron pairs on the valence shell of the central atoms of molecules position themselves as far apart in space as possible to minimize electron pair repulsion.

The number of electron pairs on the valence shell of the central atoms of molecules determine the shape and bond angle of the molecule.

If for instance, there are four electron pairs on the valence shell of the central atom of a molecule, the molecule is expected to be tetrahedral in shape with a bond angle of 109°.

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