Explain with equations and calculations, when necessary, whether an aqueous solution of each of these salts is acidic, basic, or neutral:(a) KBr;

Answer:

friction

Explanation:

Answer:

\(\huge\boxed{94.9\ grams}\)

Explanation:

Relative formula mass of phosphate:

=> \(PO_{4}\)  [Ignoring the charge on it]

Atomic mass of P = 31.0 grams, O = 15.9 grams

=>  30.97 + 4(15.9)

=> 30.97 + 63.9

=> 94.87

≈ 94.9 grams [To nearest tenth]

Answer:

\(\huge \boxed{\mathrm{D. \ 94.9 \ grams}}\)

Explanation:

Phosphate chemical formula is given as,

\(\sf PO_4\)

There is one phosphorus atom and four oxygen atoms.

Atomic mass of Phosphorus \(\sf P\) = 30.974 grams

Atomic mass of Oxygen \(\sf O\) = 15.999 grams

\(\Rightarrow 30.974 + 4(15.999)\)

\(\Rightarrow 30.974+ 63.996\)

\(\Rightarrow 94.97\)

The relative formula mass of phosphate \(\sf PO_4\) is 94.9 grams.

When using a properly stabilized balance, we should ensure that the

most accurate mass reading possible is gotten by doing the following:

A balance is an equipment which is used to measure the mass of objects.

It is best to measure the mass of the sample at room temperature to

prevent loss or reabsorption of water and to ensure air currents don't

affect the reading.

The side of the balance should be closed to prevent any form of

interference from the external environment.

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Answer:

A mid-ocean ridge is an underwater mountain range, formed by plate tectonics.Mid-ocean ridges represent one of the most important geologic processes shaping the Earth

Although the elements' properties are the same for all of them, they are distinct from those of the compound.

A property with several buildings in one location is referred to as a real estate compound. Even while many of them serve as playgrounds for such famous and wealthy, they serve other functions as well.

Chemical characteristics of a compound are distinct from those of the elements its includes. When two or even more atoms get chemically linked, a material called a molecule is created (bonded).

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Answer:

it's either B. or C.. hope this helps!

Explanation:

Answer:

D. A bus moves on a straight road and then  makes a right turn.

Explanation:

Acceleration is a change in direction or speed. All of the other examples involve straight lines or constant speed.

Answer:

34.79 atm.

Explanation:

The following data were obtained from the question:

Initial pressure (P1) = 12 atm

Initial temperature (T1) = 25 °C

Final temperature (T2) = 591 °C

Final pressure (P2) =...?

Note: the volume of the tank is constant.

Next, we shall convert celsius temperature to Kelvin temperature. This can be obtained as follow:

Temperature (K) = Temperature (°C) + 273

T(K) = T (°C) + 273

Initial temperature (T1) = 25 °C

Initial temperature (T1) = 25 °C + 273 = 298 K.

Final temperature (T2) = 591 °C

Final temperature (T2) = 591 °C + 273 = 864 K.

Finally, we shall determine the new pressure as follow:

Initial pressure (P1) = 12 atm

Initial temperature (T1) = 298 K.

Final temperature (T2) = 864 K.

Final pressure (P2) =...?

P1/T1 = P2/T2

12/298 = P2/864

Cross multiply

298 x P2 = 12 x 864

Divide both side by 298

P2 = (12 x 864)/298

P2 = 34.79 atm.

Therefore, the new pressure is 34.79 atm.

Answer:

False

Explanation:

\(\\ \rm\Rrightarrow Sodium\:Hydrogen\:carbonate=NaHCO_3\)

\(\\ \rm\Rrightarrow Calcium\:Hydroxide=Ca(OH)_2\)

\(\\ \rm\Rrightarrow Silver\:Nitrate=Ag(NO_3)_2\)

\(\\ \rm\Rrightarrow Ammonium\:Sulphate=(NH_4)_2SO_4\)

\(\\ \rm\Rrightarrow Ferric\:oxide=Fe_2O_3\)

Answer:

Radio station A broadcasts a signal with a frequency of 98.7 MHz, and radio station B broadcasts a signal with a frequency of 100.3 MHz. What can be said about ...

Explanation:

Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. Therefore, radio station B will have more energy than radio station A.

Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave.

There is a relation between energy of wave, frequency of wave, and

Mathematically,

E=hν

where,

E = energy of electromagnetic wave

ν= frequency of wave

From above formula we can see that energy is directly proportional to frequency of the wave. Since radio station B broadcasts a signal with a frequency of 100.3 MHz.  Radio station B will have more energy than radio station A.

Therefore, radio station B will have more energy than radio station A.

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The correct answer is option D.

The statement that formed the basis of Dalton’s atomic theory is atoms are the smallest particles of matter and cannot be divided farther.

In 1808, Dalton presented a theory named atomic theory which suggests that atoms are the smallest particles of an element and it is impossible to divide them further.

According to his theory every element is composed of these tiny particles.

Furthermore, his theory suggests that atoms neither can be divided nor destroyed.

In a particular matter, for example gold, all atoms have similar properties while their mass varies for every single different element.

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The complete question is:

Which of these statements is one of the conclusions that formed the basis of Dalton’s atomic theory?

a. Atoms can only change into atoms of another element through nuclear reactions.

b. Atoms of gases have less mass than atoms of liquids and solids.

c. Atoms of a particular element all have the same number of protons.

d. Atoms are the smallest particles of matter and cannot be divided farther.

Answer:

In the followings below, the one that doesn't attract to magnets is:

Option 4, Aluminum.

Explanation:

Mainly because of the aluminum's crystal structure.

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Answer:

Aluminum

Explanation:

Ferromagnetic Metals

Ferromagnetic metals and alloys are the only magnetic metals. Out of all of the elements on the periodic table, there are only 3 metals that are attracted to magnets: iron, nickel, cobalt.

Aluminum

Aluminum is a nonferrous metal (meaning not including iron or steel) that does not include any ferromagnetic metals. Additionally, aluminum itself is not magnetic, so there is no attraction between aluminum and a magnet.

Answer:

the phenotype of the offspring will be pink

Manufacturers make vegetable oils solid or semisolid at room temperature through a process called hydrogenation. Hydrogenation involves the addition of hydrogen gas to unsaturated vegetable oils, resulting in the conversion of some of the unsaturated fats into saturated fats.

This process increases the melting point of the oil and transforms it into a solid or semisolid form.

During hydrogenation, vegetable oils are heated and mixed with a catalyst, typically a metal catalyst like nickel, in the presence of hydrogen gas. The unsaturated fats in the oil undergo a chemical reaction called hydrogenation, where the carbon-carbon double bonds in the fatty acid molecules are converted into single bonds. This saturation process reduces the overall degree of unsaturation in the oil and increases its stability and solidification properties.

The hydrogenated vegetable oils, commonly known as trans fats, have a higher melting point and are solid or semisolid at room temperature. This property makes them suitable for various food applications, such as margarine, shortening, and bakery products, where a solid or semisolid texture is desired. However, it is worth noting that the consumption of trans fats has been linked to adverse health effects, and many manufacturers are now moving towards healthier alternatives and reducing the use of hydrogenated oils in their products.

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Manufacturers make vegetable oils solid or semisolid at room temperature through a process called hydrogenation.

Hydrogenation involves adding hydrogen gas to vegetable oils in the presence of a catalyst, typically nickel or palladium. This process causes the unsaturated fats in the oils to undergo a chemical reaction, converting them into saturated fats.

Saturated fats have a higher melting point and are solid or semisolid at room temperature, unlike the liquid form of unsaturated fats. By hydrogenating vegetable oils, manufacturers can increase their stability, improve texture, and extend shelf life. This transformation allows vegetable oils to be used as margarine, shortening, or in the production of solid or semisolid food products like baked goods and spreads.

Therefore, it is important to note that hydrogenation can result in the formation of trans fats, which have been associated with negative health effects. To address this concern, many manufacturers are transitioning to alternative methods or using healthier oils in their products.

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Answer:

Her speed is 6.8m/s.

Explanation:

K.E= 1/2mv²

or, 2543.2= 1/2×110×v²

or, 2543.2 = 55v²

or, 2543.2/55 = v²

or, 46.24 = v²

or, 6.8² = v²

v = 6.8 m/s

answer

6.8

explanation

k.e=1/2v^2

2543.2=55v^2

46.24=v^2

6.8^2=v^2

v=6.8

Answer:

solid goes on the first on and liquid goes on the sceond one

Answer:

It is a noble gas.

Explanation:

The element in question is helium, a noble gas. It has a full shell of eight valence electrons like all the other noble gases, which means that it does not have to react with other elements in order to obtain a full octet of valence electrons. This means that it does not react with other elements.

Answer: 1.76 M

Explanation:

To calculate the number of moles for given molarity, we use the equation:

\(\text{Molarity of the solution}=\frac{\text{Moles of solute}\times 1000}{\text{Volume of solution (in L)}}\)     .....(1)

Molarity of \(NaNO_3\) solution = 0.35 M

Volume of solution = 125 mL

Putting values in equation 1, we get:

a) \(0.35M=\frac{\text{Moles of}NaNO_3\times 1000}{125ml}\\\\\text{Moles of }NaNO_3=\frac{0.35mol/L\times 125}{1000}=0.044mol\)

1 mole of \(NaNO_3\) contains = 1 mol of \(NO_3^-\)

Thus \(0.044mol\) of \(NaNO_3\) contain= \(\frac{1}{1}\times 0.044=0.044\) mol of \(NO_3^-\)

b) \(1.1M=\frac{\text{Moles of}Mg(NO_3)_2\times 1000}{450ml}\\\\\text{Moles of }Mg(NO_3)_2=\frac{1.1mol/L\times 450}{1000}=0.495mol\)

1 mole of \(Mg(NO_3)_2\) contains = 2 mol of \(NO_3^-\)

Thus \(0.495mol\) of \(Mg(NO_3)_2\) contain= \(\frac{2}{1}\times 0.495=0.99\) mol of \(NO_3^-\)

Total \([NO_3^-]=\frac {\text {total moles}}{\text {total volume}}=\frac{0.044+0.99}{0.575L}=1.76M\)

Thus \([NO_3^-\) after mixing is 1.76 M

The term molarity is an important method which is used to determine the concentration of a solution. It is mainly used to calculate the concentration of a binary solution. The molarity is  0.66 M.

Molarity is defined as the number of moles of the solute present per litre of the solution. It is represented as 'M' and it is expressed in the unit mol / L. The concentration of a solution can also be expressed in molality, normality, etc.

Molarity = Number of moles / Volume of solution in L

M = 10 / 15 = 0.66 M

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Answer:

Solid:

shape: definite

volume:definite

closeness...: tightly packed

motion ..: vibrate in their position

liquid:

shape: indefinite

volume: definite

closeness: loosely packed

motion... : slide past each other

gas:

shape: indefinite

volume: indefinite

closeness: far apart

motion..: random movement

Explanation:

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From the balanced redox equation of the reaction, the coefficient of OH⁻ is 8.

A redox equation is the equation of a redox reaction in which oxidation and reduction occurs simultaneously.

The given redox reaction takes place in a basic solution

The balanced redox equation of the reaction is given below:

4 H₂O(l) + 3 S²⁻(aq) + 2 NO₃⁻(aq) ---> 3 S(s) + 2 NO + 8 OH⁻(aq)

In conclusion, a redox equation is balanced when oxidation and reduction occur to the same extent.

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Approximately 108.1 coulombs of charge are required to plate a layer of chromium metal 0.27 mm thick on a piece of metal with a total area of 0.30 \(m^2\) from a solution containing \(CrO_4^{2-\).

To calculate the number of coulombs required to plate a layer of chromium metal, we need to use Faraday's law of electrolysis:

Q = n F

where Q is the total charge in coulombs, n is the number of moles of electrons, and F is Faraday's constant (96485 C/mol).

To find n, we need to use the equation:

n = m / M / z

where m is the mass of the chromium metal to be plated, M is the molar mass of chromium, and z is the number of electrons transferred per chromium ion during plating. For chromium plating, z is 3.

The mass of chromium metal to be plated can be calculated using the density of chromium:

m = V * d * t

where V is the volume of the plated layer, d is the density of chromium, and t is the thickness of the plated layer.

Plugging in the given values, we get:

m = 0.27 cm * 0.03 \(m^2\) * 7.20 \(g/cm^3\) = 0.17496 kg

Next, we can calculate the number of moles of electrons:

n = 0.17496 kg / 52 g/mol / 3 = 0.001121 mol

Finally, we can calculate the total charge required:

Q = n * F = 0.001121 mol * 96485 C/mol = 108.1 C

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Answer:

español

Un elemento del grupo 3 es un elemento situado dentro de la tabla periódica en el grupo 3. Los átomos de estos elementos tienen gran tendencia a oxidarse y son muy reactivos, predominando el estado de oxidación +3. Presentan propiedades muy similares al aluminio. Dan lugar a iones incoloros.

ingles

An element of group 3 is an element located within the periodic table in group 3. The atoms of these elements have a great tendency to oxidize and are very reactive, with the +3 oxidation state predominant. They have properties very similar to aluminum. They give rise to colorless ions.

Explanation:

ingles

Group -> 3

Group -> 3Period

Group -> 3Period4 21

Group -> 3Period4 21Sc

Group -> 3Period4 21Sc5 39

Group -> 3Period4 21Sc5 39Y

Group -> 3Period4 21Sc5 39Y6 57

Group -> 3Period4 21Sc5 39Y6 57The

Group -> 3Period4 21Sc5 39Y6 57The7 89

Group -> 3Period4 21Sc5 39Y6 57The7 89Ac

español

Grupo -> 3

Grupo -> 3Periodo

Grupo -> 3Periodo4 21

Grupo -> 3Periodo4 21Sc

Grupo -> 3Periodo4 21Sc5 39

Grupo -> 3Periodo4 21Sc5 39Y

Grupo -> 3Periodo4 21Sc5 39Y6 57

Grupo -> 3Periodo4 21Sc5 39Y6 57La

Grupo -> 3Periodo4 21Sc5 39Y6 57La7 89

Grupo -> 3Periodo4 21Sc5 39Y6 57La7 89Ac

Scientist are able to see smaller cells due to the large scale of magnification of new microscopes.

The term cell refers to the simplest or the smallest unit of an organism. All organisms are composed of cells and cells come from cells. This implies that cells come from the replication of cells in the body.

Now, there are several kinds of microscopes that are in existence such as;

The scale of microscopes continue to improve as technology improves. Thus we have larger magnification and scientist are able to see smaller cells due to the large scale of magnification of new microscopes.

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Answer:

1.2807 moles

Explanation:

From rearranging the equation for the ideal gas equation, you get the equation n=PV/RT, n= moles, P= pressure, V= volume, R= gas constant, T= temperature. Plugging in the numbers and converting kPa to atm and C to K, you get n=1.19418*28/ .0821*318.

Then, you just do the math and get 1.2807 moles.

The digestive system is made up of the gastrointestinal tract—also called the GI tract or digestive tract—and the liver, pancreas, and gallbladder. The GI tract is a series of hollow organs joined in a long, twisting tube from the mouth to the anus. The hollow organs that make up the GI tract are the mouth, esophagus, stomach, small intestine, large intestine, and anus. The liver, pancreas, and gallbladder are the solid organs of the digestive system.

The small intestine has three parts. The first part is called the duodenum. The jejunum is in the middle and the ileum is at the end. The large intestine includes the appendix, cecum, colon, and rectum. The appendix is a finger-shaped pouch attached to the cecum. The cecum is the first part of the large intestine. The colon is next. The rectum is the end of the large intestine.

Digestion is important because your body needs nutrients from food and drink to work properly and stay healthy. Proteins, fats, carbohydrates, vitamins NIH external link, minerals NIH external link, and water are nutrients. Your digestive system breaks nutrients into parts small enough for your body to absorb and use for energy, growth, and cell repair.

Each part of your digestive system helps to move food and liquid through your GI tract, break food and liquid into smaller parts, or both. Once foods are broken into small enough parts, your body can absorb and move the nutrients to where they are needed. Your large intestine absorbs water, and the waste products of digestion become stool. Nerves and hormones help control the digestive process.

Liam could consider testing a range of cations, such as sodium, potassium, calcium, and magnesium, at various concentrations, and observe their effects on pH.

To decide which salts to test when investigating the effects of cations on pH, Liam should consider the following factors:

The identity of the cations: Liam should choose cations that have different properties, such as size, charge, and reactivity. This will allow him to observe a range of effects on pH and better understand the underlying mechanisms.

The concentration of the salts: Liam should choose concentrations that are within a reasonable range and that allow him to detect changes in pH. If the concentrations are too low, the changes in pH may be too small to observe, and if they are too high, the salts may be too reactive and produce unwanted side effects.

The availability and safety of the salts: Liam should choose salts that are readily available and safe to handle. He should also consider the cost and accessibility of the salts, as well as any potential hazards associated with their use.

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Answer:

31.08 atm.

Explanation:

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

Initial volume (V₁) = 0.60 L

Initial temperature (T₁) = 161 K

Final volume (V₂) = 14.1 L

Final temperature (T₂) = 297 K

Final pressure (P₂) = 2.44 atm

Initial pressure (P₁) =?

The initial pressure of the gas can be obtained as follow:

P₁V₁/T₁ = P₂V₂/T₂

P₁ × 0.6 / 161 = 2.44 × 14.1 / 297

P₁ × 0.6 / 161 = 34.404 / 297

Cross multiply

P₁ × 0.6 × 297 = 161 × 34.404

P₁ × 178.2 = 5539.044

Divide both side by 178.2

P₁ = 5539.044 / 178.2

P₁ = 31.08 atm

Thus, the initial pressure of the gas was 31.08 atm.

Answer:

2NaCl = 2Na + 2Cl

Explanation:

Sodium chloride decomposes to form sodium and chlorine