Predict whether each of the following ionic compounds is soluble in water. Answer either Soluble or insoluble
LiCl
AgCl
BaCO3
K2O
Fe(NO3)3
PbS
CaCO3
K2S
Ag2O
Mg3(PO4)2

Answer:

The highest energy level number (1 through 7) for the electrons in an atom corresponds to the period (or row) in the periodic table to which that atom belongs. Because there are 7 periods in the table, there are 7 energy levels. For example, hydrogen (H) is in the first period, so it has only one energy level.

Answer:

1.31M

Explanation:

Based on the reaction, 1 mole of Zn produce 1 mole of ZnCl₂. As the reaction occurs completely, the moles of Zn added = Moles of ZnCl₂ produced. To find molarity we need the moles of ZnCl₂ and the volume of the solution in liters:

Moles Zn = Moles ZnCl₂ -Molar mass Zn: 65.38g/mol-:

15g * (1mol / 65.38g) = 0.23 moles of ZnCl₂

Volume in Liters:

175mL * (1L / 1000mL) = 0.175L

The molarity is:

0.23moles / 0.175L

  The density of cork is around 0.24 to 0.32 g/cm³.

Cork is a lightweight and porous material, and its density varies depending on factors such as the type of cork and its production process. The density of natural cork ranges from 0.24 to 0.32 g/cm³, while the density of agglomerated cork (made by compressing cork granules) can be higher, ranging from 0.40 to 0.70 g/cm³. The low density of cork makes it a popular choice for a variety of applications, including wine bottle stoppers, insulation, and flooring.  

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Answer:

steel solder brass Peter duralumin bronze and amalgams

Answer:

I hope it help you,

The number of moles of gas in the expanded container would be 0.5 moles.

According to Avogadro's law, an equal volume of gases at the same temperature and pressure will contain the same number of molecules.

Avogadro's law can be mathematically expressed as:

\(v_1/n_1 = v_2/n_2\)

Where \(v_1\) = initial volume, \(v_2\) = final volume, \(n_1\) = the initial number of moles, and \(n_2\) = the final number of moles.

In this case, \(n_1\) = 1.25 moles, \(v_1\) = 25.0 L, \(v_2\) = 10.0 L

Thus, we are to make \(n_2\) the subject of the formula:

\(n_2 = v_2n_1/v_1\)

     = 10 x 1.25/25

     = 0.5 moles

In other words, the number of moles of gas in the expanded container is 0.5 moles.

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Answer: 13.00

Explanation: got it right

Answer: An indicator is itself a weak acid or weak base but a special one. The colour of the acid form is different from the colour of the base form. So you can tell when the pH of your solution has changed from being one to the other by seeing the colour change from one to the other. The particular pH where that colour change occurs depends on the particular indicator you use. The most common indicator in UG Chem Labs is probably the one called Phenolphthalein when it has its proton attached, it is colourless like water but when the proton comes off it is pink. This change happens around pH=8–9. any solution with pH below that (acidic) will make the phenolphthalein hold onto its proton and be colourless. Any pH above that will cause it to lose its proton and become pink.

Explanation:

Answer:

Explanation:  Answer and Explanation: In a battery operated flash light, the energy conversions which take place are: chemical energy is converted to electrical energy and then the chemical energy is converted to light energy.

Answer:

The correct answer is - 75 grams.

Explanation:

Half-life is the amount of time that is used by the given amount of substance or element to make it half of the initial amount of a particular radioactive substance.

Equation for alpha decay for radon

\(^222_{86}Rn\Rightarrow^{218}_{84}Po  \)

we need to calculate the left amount of radon after given time

using formula half life

\(N(t)=N_{0}e^{-\lambda t}\)

\(\lambda =\dfrac{0.693}{3.82}\)

\(\lambda=0.1814\)

\(N(3.82)=150\times e^{-0.1814\times3.82}\)

\(N(3.82)=75.0\ g\)

Thus, the left amount of radon is - 75 grams.

The grams of magnesium will be needed to react if the conditions are 0.985 atm and 22 °C is 0.49 g.

The reaction is as follows :

3Mg + 2H₃PO₄ → Mg₃(PO₄)₂ + 3H₂

Volume = 500 mL = 0.500 L

Pressure = 0.985 atm

Temperature =  22 °C = 295 K

The ideal gas equation is as follows :

P V = n R T

n = P V / R T

n = ( 0.985 × 0.500 ) / ( 0.082 × 295 )

n = 0.492 / 24.18

n = 0.020 mol

The number of moles = 0.020 mol

3 moles of H₂ = 3 moles of Mg

The moles of Mg = 0.020 mol

The molar mass of the magnesium = 24.30 g/mol

The mass of the magnesium = moles × molar mass

                                             = 0.020 × 24.30

                                             = 0.49 g

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Answer: c

Explanation: built different

The ground state electron configuration of Br is E. [Ar]4s24d104p6. The  Br has 35 electrons, and the electron configuration is determined by filling up the orbitals in order of increasing energy. The first 18 electrons fill up the first three energy levels, which are represented by the noble gas configuration of Argon ([Ar]).

The remaining 17 electrons fill up the 4th and 5th energy levels, with the 4s and 4p orbitals filling up before the 5s and 5p orbitals. Therefore, the correct configuration is [Ar]4s24d104p6.
To determine the ground state electron configuration for Br, we can follow the periodic table order. Bromine has an atomic number of 35, which means it has 35 electrons. Starting from hydrogen, we fill the orbitals in the order: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p.

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Therefore, the osmotic pressure of seawater, which contains approximately 35.0 grams of NaCl per liter, at 25°C is approximately 1498.59 Pa.

how to calculate the osmotic pressure ?

The osmotic pressure of seawater can be calculated using the Van't Hoff equation, which relates the osmotic pressure of a solution to its concentration and the temperature. The equation is given by:

Π = MRT

where M is the molarity of the solute, R is the ideal gas constant, and T is the temperature in kelvins. The molar mass of NaCl is 58.44 g/mol, so 35 g of NaCl in a liter of water corresponds to a molarity of:

M = 35 g / 58.44 g/mol = 0.599 mol/L

Converting the temperature from degrees Celsius to kelvins gives:

T = 25°C + 273.15 = 298.15 K

Substituting the values into the Van't Hoff equation gives:

Π = 0.599 mol/L * 8.31 J/(mol*K) * 298.15 K

Π = 1498.59 Pa

Therefore, the osmotic pressure of seawater, which contains approximately 35.0 grams of NaCl per liter, at 25°C is approximately 1498.59 Pa.

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To calculate the energy required to heat a substance, we can use the formula:

Q = mcΔT

where Q is the heat energy, m is the mass of the substance, c is the specific heat capacity, and ΔT is the change in temperature.

Given that we have 712.0 g of graphite, a specific heat capacity of 0.710 J/g-K, and a temperature change of 18.7 °C (20.7 °C - 2.0 °C)

Q = (712.0 g) x (0.710 J/g-K) x (18.7 °C)

Q = 10,965.64 J.

The energy required to heat 712.0 g of graphite from 2.0 °C to 20.7 °C is 10.965 kJ.

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Answer:

Does the nature of intermolecular forces present in different substance affect their boiling points?

Explanation:

In every scientific research there must be a dependent and an independent variable. These variables are easily deduced from the scientific question that is being investigated.

If a student is comparing the boiling points of different substances having different intermolecular forces, then his or her aim is to establish a relationship between the nature of intermolecular forces present (independent variable) and the observed boiling point of the substance (dependent variable).

This is aptly shown by the research question ' Does the nature of intermolecular forces present in different substance affect their boiling points?'

Options:

Is boiling point affected by the strength of particle attraction?

Is boiling point affected by the mass of the sample?

Is boiling point correlated to melting point?

Is boiling point the temperature at which a substance changes its state?

Explanation:

ADD THE OPTIONS PEOPLE OR YOU GET NON RELATED AWNSERS LIKE THE ONE ABOVE

Answer:

it would be ionic

copper forms a cation and oxygen forms an anion

those charges represent the e-s that are transferred during bonding

oxygen is -2 so will accept 2 e-s to achieve noble gas configuration

Explanation:

Answer:

EIA projects less than a quarter of the world's electricity generated from coal by 2050. net electricity generation by fuel.

Explanation:

Answer:

Balanced Chemical Equation:

H3PO4 + 5HCl → PCl5 + 4H2O

Flowing water from the Rocky Mountains formed the mighty Colorado River. As the plateau rose, rivers cut through it, carving canyons over time.

When water freezes it expands into ice. Ice widens cracks and erodes rock in the process. During short periods of heavy rain, water rolls down cracks and erodes more rocks and stones. The canyon becomes wider at the top than at the bottom as more rock is eroded away.

The Grand Canyon is perhaps the best example of a water-sculpted canyon. Water exerts tremendous erosive power, especially when carrying large amounts of sediment and rocks, as the Colorado River does during floods. The Grand Canyon is a large deep river canyon in northwest Arizona. Water was the main cause of the erosion that formed the Grand Canyon.

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Answer:

Explanation:

Atoms are the thing that make up molecules and compounds. Molecules contain two or more atoms and are held together by covalent bonds

Answer: The total mass of the reactants must equal the total mass of the products.

Explanation: This is because the mass of all reactants is the mass of all products. Remember that escaping gases from products can lessen the mass. But in all, all products have the same mass as the reactants. I hope this helps!

Answer:

chalk bubbles with vinegar

Answer:

1) The frequency of each photon is 3.0 × 10⁹ Hz

2) The energy of each photon is 1.98786 × 10⁻²⁴ J

Explanation:

The energy, 'E', in a photon of light is given by Planck's equation as follows;

E = h·f = h·c/λ

Where;

E = The energy of a photon

h = Planck constant = 6.6262 × 10⁻³⁴ J·s

f = The frequency of the photon/radiation

c = The speed of light = 3.0 × 10⁸ m/s

λ = The wavelength of the photon/radiation

The given parameters of the microwave are;

The wavelength, λ = 10 cm = 0.1 m

The type of wave = Microwave

1) From E = h·f = h·c/λ, we find that the frequency, 'f' equals c/λ

∴ f = 3.0 × 10⁸ m/s/(0.1 m) = 3.0 × 10⁹ 1/s = 3.0 × 10⁹ Hz

The frequency of each photon, f = 3.0 × 10⁹ Hz

2) From E = h·f = h·c/λ, the energy, 'E', of each photon is given as follows;

E = h·c/λ = 6.6262 × 10⁻³⁴ J·s × 3.0 × 10⁸ m/s/(0.1 m) = 1.98786 × 10⁻²⁴ J

The energy of each photon, E = 1.98786 × 10⁻²⁴ J

Answer:

is there a way of reducing light pollution at the edges of a forest work?

Answer:

270g

Explanation:

Given parameters:

Concentration of NaOH  = 1.5M

Volume  = 4.5L

Unknown

Mass of NaOH added  = ?

Solution:

To solve the problem, we need to find the number of moles of the NaOH first;

 Number of moles  = concentration x volume

 Number of moles  = 1.5 x 4.5  = 6.75mol  

Now;

  Mass  = Number of moles x molar mass

 Molar mass of NaOH  = 23 + 16 + 1  = 40g/mol

  Mass  = 6.75 x 40  = 270g

Answer:

A: 92.02 g

Explanation:

Equation of the reaction;

N2 (g)+ 2O2(g)------> 2NO2(g)

Note that the balanced reaction equation is the first step in solving any problem on stoichiometry. Once the reaction equation is correct, the question can be easily solved...

Potassium can be a component of the cream.

An element's presence can be determined using a flame test. The potassium in cream of tartar is what gives it its white-purple color.

Low ionization enthalpy elements allow the flame to display color. Due to low ionization enthalpy, when an element is heated, its valence electrons are quickly excited to higher orbits and emit light as they return to their original orbit. Salts of potassium emit a white-purple color when ignited. The cream of tartar's chemical formula is KC₄H₅O₆.

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There is 1.0 mole of KNO₃ in 500.0 mL of a 2.0 M KNO₃ solution.

To determine the number of moles of KNO₃ in 500.0 mL of a 2.0 M KNO₃ solution, we need to use the equation:

moles = concentration (M) × volume (L)

Since 1 liter is equal to 1000 milliliters, we divide 500.0 mL by 1000 to get 0.5 L.

Next, we substitute the values into the equation:

moles = 2.0 M × 0.5 L

The concentration of 2.0 M indicates that there are 2.0 moles of KNO₃ in 1 liter of the solution. Therefore, multiplying the concentration (2.0 M) by the volume (0.5 L) gives us the number of moles of KNO₃:

moles = 2.0 M × 0.5 L = 1.0 mol

Hence, there is 1.0 mole of KNO3 in 500.0 mL of a 2.0 M KNO₃ solution.

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