10 uses of metals in daily life

Rank the gases Ar, N2, CH4, and C2H6 in order of increasing density at STP.

ans : CH4

CaF₂ ⇒ Ca²⁺ + 2F⁻

1.75       1.75     3.5

Atomic size decreases across a period because but the positive charge of the nucleus gets increases across a period.

The shielding effect is the shielding from the pulling force of the positively-charged nucleus given to. the outermost shell electrons by the inner electrons.

Since the shielding effect remains constant across a group but the positive charge of the nucleus gets bigger, atomic size decreases across a period.

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the quality of being periodic the tangency to record the intervals

the prediotic of the sun sports cycle

Answer:

Amm is this right (if is it the right so mark me the brainliest pls)

Explanation:

Answer : Solutions- Brine, Soda water. Suspensions- Muddy river water, Chalk water mixture, Milk of magnesia, Smoke in air. Colloids- Milk, Ink, Blood, shaving cream.

Answer:

This means that the pH values of strong acids are lower than that of weak acids, which explains why the rate of reaction of strong acids with substances (such as metals, metal carbonates etc) is higher than that of weak acids.

Explanation:

welcome

Answer:

.156   M

Explanation:

diluting 25 to 100 cuts the M to 1/4 of the original

1/4 * .625 = .15625

2.56 L is the volume of air in his tank at a depth of 100 ft (3 atm) and a temperature of 24°C.

The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).

Given data:

[tex]P_1=1 atm[/tex]

[tex]V_1=3.20 L[/tex]

[tex]T_1[/tex]=30°C

[tex]P_2=3 atm[/tex]

[tex]V_2=?[/tex]

[tex]T_2=24°C[/tex]

Using the equation:

[tex]\frac{P_1V_1}{T_1}[/tex] =[tex]\frac{P_2V_2}{T_2}[/tex]

[tex]V_2[/tex] =(1 atm x 3.20 L x 24°C) ÷ 30°C

[tex]V_2[/tex] = 2.56 L

Hence,  2.56 L is the volume of air in his tank at a depth of 100 ft (3 atm) and a temperature of 24°C.

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-1.09'C is the change in freezing point

“Freezing point depression” depends on the solvent and the molar concentration of the solute.

Sulfide is highly basic, consequently

K2S

completely and irreversibly hydrolyzes in water according to the following equation:

K2S+H2O→KOH+KSH

Freezing, also known as solidification, is a phase transition where a liquid turns into a solid when its temperature is lowered below its freezing point.

the temperature at which a liquid solidifies specifically : the temperature at which the liquid and solid states of the substance are in equilibrium at atmospheric pressure : melting point the freezing point of water is 0° Celsius or 32° Fahrenheit.

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Answer:1.0881

Explanation:

The change in the freezing point of the solution is 1.1°C.

The freezing point depression is a colligative property thus we must take note of the number of particles in solution.

Using;

ΔT = k m i

k = 1.86 °C/m

m = 0.195 m

i = 3

ΔT = 1.86 °C/m *  0.195 m * 3

ΔT = 1.1°C

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Answer:

1.0881

Explanation:

Correct answer for Acellus

Answer: 40. mol (to 2 sf)

Explanation:

Since there are 9 oxygen atoms in every molecule of aluminum nitrate, this means that there are 9 moles of oxygen atoms in each mole of aluminum nitrate.

So, in 4.4 moles, there are 9(4.4) = 40. mol (to 2 sf)

0.47 M is the molarity of solution B if 10.00 g of LiCl is dissolved in water to make 1.00 L of "Solution A".

Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution. Molarity is also known as the molar concentration of a solution.

[tex]Molality = \frac{Moles \;solute}{Solvent \;in \;kg}[/tex]

Moles of  LiCl

[tex]Moles = \frac{mass}{molar \;mass}[/tex]

[tex]Moles = \frac{10.00 g}{42.394 g/mol}[/tex]

Moles = 0.2358824362

[tex]Molality = \frac{0.2358824362}{0.5 L}[/tex]

Molarity = 0.4717648724 M =0.47 M

Hence, 0.47 M is the molarity of solution B.

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Copper has the highest thermal conductivity as compared to other metals in the periodic table.

Thermal conductivity refers to the rate at which heat is transferred by conduction through a unit cross-section area of a material. When a temperature increases at one end it moves to the other end through conduction.

So we can conclude that Copper has the highest thermal conductivity as compared to other metals in the periodic table.

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Answer: C

Explanation:

A) There is 1 fewer hydrogen atom.

B) There are 2 fewer carbon atoms.

D) There is 1 extra hydrogen atom.

The balanced equation will be [tex]CH_4 + 2O_2 --- > CO_2 + 2H_2O[/tex]

The balanced equation of the reaction would be as follows:

[tex]CH_4 + 2O_2 --- > CO_2 + 2H_2O[/tex]

The mole ratio of methane to carbon dioxide is 1:1.

10 grams of methane will give 10/16 = 0.625 moles

0.625 moles of carbon dioxide would give 0.625 x 44.01 = 27.506 grams.

Thus, 10 grams of methane will produce approximately 27 grams of carbon dioxide stoichiometrically.

The reaction obeys the law of conservation of mass because the atoms of all the elements before and after the reaction are balanced.

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Answer:

a) The wrong denominator for the equivalent fraction of kilograms to grams

b) The use of the scale factor of length rather than the scale factor of volume for the equivalent fraction of cubic centimeters to cubic meters

c) The arrival at the correct 1000 kg/m³ rather than 0.1 g/m³ based on the expression on the left of the equation

The density of water = 1 g/cm³

The given equation is presented as follows;

1 g/cm³ × 1 kg/(1000 kg) × 100 cm³/(1 m³) = 1000 kg/m³

The error in the conversion method are;

a) The conversion, 1 kg/(1,000 kg) has an error, the correct conversion is (1 kg)/1,000 g)

b) The volume conversion error, 100 cm³/(1 m³), the correct volume conversion is (100 cm)³/(1 m³) = 1,000,000 cm³/(1 m³)

c) The right of the equal to sign error; using the left side expression only, the (wrong) answer is 0.1 g/m³

The correct equation is presented as follows;

1 g/cm³ × 1 kg/(1000 g) × 1,000,000 cm³/(1 m³) = 1000 kg/m³

Explanation: hope this help.

Answer:

c - 1,000 kg should be written as 1,000 g.

Explanation:

got it correct on the test.

Answer:

See below

Explanation:

The way to calculate this

  speed of light =  wavelength * frequency

   3 x 10 ^8 m/s   =   wavelength * 2450000000 Hz

       wavelength = .12245 meters

                    = 1.2245 x 10^-1  Meters  

The wavelength of a microwave with a frequency of 2450 mhz is 1.2245 x 10⁻¹ meters.

The wavelength is the time period or spatial period between the periodic wave and the distance between two waves. A microwave is a form of electromagnetic radiation.

The frequency of a microwave, f = 2450 MHz

We need to find the wavelength and the period of the microwaves

c = f λ

c = speed of light = 3 x 10 m/sec. 8 c = λf where λ = wavelength, f = frequency. Length

The relation between the wavelength and frequency is given by

The speed of light =  wavelength x frequency

3 x 10⁸ m/s   =   wavelength x 24500 Hz

Wavelength = .12245 meters

1.2245 x 10⁻¹  Meters  

Therefore, the wavelength of a microwave with a frequency of 2450 MHz is 1.2245 x 10⁻¹ meters.

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Answer: C

Explanation:

iron sulfide.

Answer:

C. Iron sulfide

Explanation:

Stay safe, stay healthy and blessed

Have a good day

Thank you

Answer:

D - all of the above

Explanation:

225 milliliters of a 0.8 solution of citric acid would be needed to react with 15 g of baking soda.

The volume of a substance can be calculated using the following formula:

molarity = no of moles ÷ volume

no of moles of baking soda (NaHCO3) = mass ÷ molar mass

Molar mass of baking soda = 84.007g/mol

no of moles = 15g ÷ 84.007g/mol = 0.18mol

0.8 = 0.18/volume

volume = 0.23L equivalent to 225mL

Therefore, 225 milliliters of a 0.8 solution of citric acid would be needed to react with 15 g of baking soda.

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225 millilitres of a 0.8 solution of citric acid would be needed to react with 15 g of baking soda.

Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution. Molarity is also known as the molar concentration of a solution.

[tex]Molality = \frac{Moles \;solute}{Volume of solution in litre}[/tex]

[tex]Moles of baking soda (NaHCO_3) =\frac{mass}{molar \;mass}[/tex]

Molar mass of baking soda = 84.007g/mol

[tex]Moles of baking soda (NaHCO_3) =\frac{15g}{84.007g/mol}[/tex]

[tex]Moles of baking soda (NaHCO_3) = 0.18mol[/tex]

Now, calculating volume with the molarity formula:

Molality = [tex]\frac{Moles \;solute}{Volume \;of \;solution \;in \;litre}[/tex]

0.8 = [tex]\frac{0.18 }{Volume \;of \;solution \;in \;litre}[/tex]

Volume = 0.23L equivalent to 225mL

Therefore, 225 milliliters of a 0.8 solution of citric acid would be needed to react with 15 g of baking soda.

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Answer:

a.  V=44.9mL

Explanation:

For a gas undergoing all of these changes, it will be important to combine Boyle's Law and Charles' Law to form the following equation (if it isn't already known):

[tex]\dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}[/tex]

Where the Temperatures must be measured in Kelvin.

Recall that to convert Celsius to Kelvin, one must add 273 or use the equation [tex]T_C+273=T_K[/tex].

Thus, [tex]T_1=(18.1+273)[K]=291.1[K][/tex]  and [tex]T_2=(12.5+273)[K]=285.5[K][/tex]

To solve for the requested quantity, note that all of the other units match between beginning and end, so we substitute and solve:

[tex]\dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}[/tex]

[tex]\dfrac{(2.61[atm])V_1}{(291.1[K])}=\dfrac{(1.92[atm])(59.9[mL])}{(285.5[K])}[/tex]

[tex]\dfrac{(2.61[atm] \!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{-----})\bold{V_1}}{291.1[K] \!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{-----}}*\dfrac{291.1[K] \!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{-----}}{2.61[atm]\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{-----}}=\dfrac{(1.92[atm]\!\!\!\!\!\!\!\!\!\!\!{--})(59.9[mL])}{285.5[K\!\!\!\!\!{-}]}*\dfrac{291.1[K\!\!\!\!\!{-}]}{2.61[atm]\!\!\!\!\!\!\!\!\!\!\!{--}}[/tex]

[tex]V_1=44.928677576[mL][/tex]

Accounting for significant digits, [tex]V_1=44.9[mL][/tex]

Answer:

c. a hypothesis  is the correct answer

Explanation:

Answer:

Any characteristic that can be measured, such as an object's density, color, mass, volume, length, malleability, melting point, hardness, odor, temperature, and more, are considered properties of matter.

Answer: Fe2O3

Explanation: By applying crisscross method, the formula will be Fe2O3.

Answer:

Explanation:

Mark this answer as brainlest answer!!

Answer:

This is not oxidation as it gain electron .

Oxidation reaction means addition of oxygen or removal of hydrogen

or in other words loss of electrons

Mg ----> Mg²+ + 2e

this is oxidation reaction as Mg loss 2e to become +2

Sn³+ -----> Sn4+ + 2e

this is oxidation reaction as it losses electrons

similarly other are also oxidation.