Germanium has a face-centered cubic unit cell. The density of germanium is 5.32 g/cm3. Calculate a value for the atomic radius of germanium.

Answer:

d. Two moles of carbon dioxide were produced from this reaction

Explanation:

The given chemical reaction can be written as follows;

2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O

From the above chemical reaction, we have;

Two moles of C₂H₂ reacts with five moles of O₂ to produce four moles of CO₂ and two moles of H₂O

We have;

One mole of C₂H₂ will react with two and half moles of O₂ to produce two moles of CO₂ and one mole of H₂O

Therefore, in the above reaction, when one mole of C₂H₂ is used, two moles of CO₂ will be produced.

Answer:

600.7 moles

Explanation:

Applying,

PV = nRT................... Equation 1

Where P = Pressure of oxygen, V = Volume of oxygen, n = number of moles, R = molar gas constant, T = Temperature.

make n the subject of the equation

n = PV/RT............... Equation 2

From the question,

Given: P = 190 atm, V = 35 L, T = 135 K

Constant: R = 0.082 atm.dm³/K.mol

Substitute these values into equation 2

n = (190×35)/(135×0.082)

n = 600.7 moles of xygen

Answer:

halving, the mass of planet X and halving the distance between the planets

The gravitational force of attraction is the fundamental force of the universe. Doubling the mass of planet X and halving the distance between the planets increases the gravitational attraction. The correct option is C.

The force of attraction between any two bodies is directly proportional to the product of their masses and is inversely proportional to the square of the distance between them. The formula of gravitational force is given as:

F = G m₁m₂ / r²

From the equation it is clear that the gravitational force increases with the increase in the mass and decreases with the increase in the distance between the objects. This law is true for each particle of matter, each particle of matter attracts every other particles.

Here doubling the mass of planet X and halving the distance between the planets increases the gravitational attractive force.

Thus the correct option is C.

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Answer:

c. Ca(OH)2

Explanation:

I took the test ;)

In chemistry, bases are substances that react with an acid to yield salt. Calcium hydroxide (Ca(OH)₂) is a base as it is a hydroxide of metal. Thus, option c is correct.

Bases are solutes that react with acidic substances to produce water and salt. It comprises substances with hydroxide ion that reacts with hydrogen ion of acid to complete the neutralization reaction.

The carbonates, oxides, and hydroxides of metals make the base that has a pH range of below 7 up to 14. The alkalinity of the substance depends on the ability to release the hydroxide ions in the solution.

Calcium hydroxide (Ca(OH)₂) is a base as it contains OH⁻ ions that are characteristic of bases. On the other hand, NaCl is salt and HF is an acid.

Therefore, Ca(OH)₂ is a base.

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Answer:

329.7%

Explanation:

Percent Yield = Actual Yield/ Theoretical Yield x 100%

Percent Yield = 105.5g/32 x 100% = 329.69 ≈ 329.7 %

Answer:

:D

Explanation:

8. D. All of the above

9. C. Mechanical weathering

10. D. All of the above

Answer:

8. D

9. A

10. D

The presence of rust in the water of Westfield is the reason for the change in colour.

The water of Westfield has reddish-brown substance. This reddish brown substance in the water is the rust which formed due to the chemical reaction between the iron pipes and the fertilizer substance present in the water.

Due to this reaction, the colour of Westfield's water is different from normal type of water so we can conclude that the presence of rust in the water of Westfield is the reason for the change in colour.

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Answer:

answer is d

i hope this helps you

The reaction that represents natural nuclear decay is 335 U → He + 331 Th, i.e., option C.

Nuclear reactors continue to operate by enclosing the nuclear fission process.

Even after fission has stopped, radioactive decay of fission products and transuranic elements formed in a reactor produces heat.

Fission reactions can be moderated in order to increase fission or unmoderated in order to breed more fuel.

The reaction that represents natural nuclear decay is

Thus, the correct option is C.

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Answer:

0.075 moles of iron oxide would be produced by complete reaction of 0.15  moles of iron.

Explanation:

The balanced reaction is:

4 Fe + 3 O₂ → 2 Fe₂O₃

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

You can apply the following rule of three: if by stoichiometry 4 moles of Fe produce 2 moles of Fe₂O₃, 0.15 moles of Fe produce how many moles of Fe₂O₃?

[tex]moles of Fe_{2} O_{3} =\frac{0.15 moles of Fe*2 moles of Fe_{2} O_{3} }{4 moles of Fe}[/tex]

moles of Fe₂O₃= 0.075

0.075 moles of iron oxide would be produced by complete reaction of 0.15  moles of iron.

Answer: the answer is a

Explanation:

always eat fresh fruits and veggiies.

Answer: An example is NaCl which exist as a ionic compound which has  an ionic bond  

Explanation: First of all , ionic bonds is the bond formed when a metal and a non metal reacts together.

in sodium chloride it contain sodium and chlorine IONS which are charged particles. the charged particles which are the ions are held together with these force of attraction hence creating such ionic bonds between them

so Na ions and the Cl ions are held together by their ions

Na± and the Cl±

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Answer:

This natural gas deposit contains 1,300,813.008 moles.

Explanation:

An ideal gas is a theoretical gas that is considered to be composed of point particles that move randomly and do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.

An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of the gases:

P * V = n * R * T

In this case:

Replacing:

15 atm* 2.24*10⁶ L= n*0.082 [tex]\frac{atm*L}{mol*K}[/tex]* 315 K

Solving:

[tex]n=\frac{15 atm* 2.24*10^{6}L }{0.082\frac{atm*L}{mol*K}*315 K}[/tex]

n=1,300,813.008 moles

This natural gas deposit contains 1,300,813.008 moles.

Answer:

0.021

Explanation:

that's the answer because I just did an exam that included this question and then the miss explained to me why this was the answer, but don't worry am 100% sure the answer is 0.021 .

The mole fraction of ethanol in a solution of 47.5 g of ethanol in 850 g of water is 0.021.

Mole fraction of any substance present in solution will be calculted by dividing the moles of sample to the total moles of solution.

Moles will be calculated as:

n = W/M , where

W = given mass

M = molar mass

Moles of ethanol will be calculated as:

n = 47.5g / 46.07g/mol = 1.03 moles

Moles of water will be calculated as:
850g / 18g/mol = 47.18 moles

Total moles of solution = 1.03 + 47.18 = 48.21 moles

Mole fraction of ethanol in water will be calculated as:

mole fraction = 1.03 / 48.21 = 0.021

Hence, mole fraction is 0.021.

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Answer:

Potassium Bromide

Explanation:

not sure but i think thats it

Answer:

0.027 M HCl

Explanation:

The chemical equation of the neutralization is:

1 NaOH + 1 HCl -> 1 H2O + 1 NaCl

Because the ratio of NaOH and HCl is 1:1 you can use the M1V1=M2V2 formula.

(75 mL)(0.5 M NaOH) = (165 mL)(M HCl)

It requires 0.027 M HCl.

Answer: [tex]49.7\ cm^3[/tex]

Explanation:

Given

At temperature [tex]T_1=289\ K[/tex]

Volume is [tex]V_1=42\ cm^3[/tex]

and the temperature changes to [tex]T_2=342\ K[/tex]

At this temperature volume is [tex]V_2[/tex]

Consider Pressure remains the constant

[tex]\therefore \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}\\\\\Rightarrow V_2=V_1\times \dfrac{T_2}{T_1}\\\\\text{Insert values}\\\\\Rightarrow V_2=42\times \dfrac{342}{289}\\\\\Rightarrow V_2=49.7\ cm^3[/tex]

The volume at this temperature is [tex]49.7\ cm^3[/tex]

Answer:

Explanation:

The answer is 9.03 × 10²⁴ molecules.

Avogadro's number is the number of units (atoms, molecules) in 1 mole of substance.

Make the proportion.

6.02 × 10²³ molecules per 1 mol

x per 15 mol

6.02 × 10²³ molecules : 1 mol = x : 15 mol

x = 6.02 × 10²³ molecules * 15 mol * 1 mol

x = 90.3 × 10²³ molecules

x = 9.03 × 10 × 10²³ molecules

x = 9.03 × 10²³⁺¹ molecules

x = 9.03 × 10²⁴ molecules

The pressure inside the television tube containing 2×10¯⁵ g of N₂ at 22 °C is 4.94×10¯⁶ atm

Mole = mass / molar mass

Mole of N₂ =  2×10¯⁵ / 28

Mole of N₂ = 7.14×10¯⁷ mole

The pressure inside the television tube can be obtained by using the ideal gas equation as follow:

PV = nRT

Divide both side by V

P = nRT / V

P = (7.14×10¯⁷ × 0.0821 × 295) / 3.5

P = 4.94×10¯⁶ atm

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React with metal : property of acidic solutions.

PH > 7 : property of basic solutions.

Feels slippery: property of basic solutions

PH = 7: property of neutral solutions.

Tastes sour : property of acidic solutions.

more H+ ions than : property of acidic

OH- ions solutions.

OH- ions & H+ ions : property of neutral

present in equal solutions

amount

PH< 7 : property of acidic solutions.

conducts : property of acid solutions,

electricity property of basic solutions,

in Water property of acid & base

solutions

Tastes bitter : property of basic

solutions.

Answer:

54.93 g/mol

Explanation:

a) the element with symbol Mn is known as Manganese and I figured it out by looking at the periodic table.

b) I took a look at the periodic table again, and seen how much the atomic mass is and from there I observed:

Mn= 54.938 g/mol

rounded is 54.94 g/mol

Answer:

See Explanation

Explanation:

Volume of base used  = (31.79 - 1.6) + (32.12 - 0.98) + (42.87 -13.21)/3 = 30.34 cm3

Volume of acid used = (24.86 - 0.42) + (24.11 - 0.11) + (27.67 -3.42)/3 = 24.23 cm3

For trial 1= number of moles of HBr = 24.44/1000 * 0.3 = 0.0073 moles

For trial 2= number of moles of HBr = 24/1000 * 0.3 = 0.0072 moles

For trial 3= number of moles of HBr = 0.0089 moles

HBr(aq) + KOH(aq) -----> KBr(aq) + H2O(l)

One mole of base is required to neutralize one mole of acid.

From CAVA/CBVB =nA/nB

CAVAnB = CBVBnA

CB = CAVAnB/VBnA

CB = 0.3 * 24.23 * 1/30.34  * 1

CB = 0.24 moldm-3

number of moles of KOH = concentration * volume

number of moles = mass/molar mass

molar mass of KOH = 56 g/mol

mass/56 =  0.24 * 30.34/1000

mass = 0.24 * 30.34/1000 * 56

mass =0.408 g of KOH

Answer:

For example, the sugar found in milk is called lactose. With the aid of the enzyme, lactase, the substrate, lactose, is broken down into two products, glucose and galactose. People who don't make enough lactase have trouble digesting milk products and are lactose intolerant.

Answer:

is it the one where the objective was : To observe the changes in equilibrium when different components are added or taken away.

Answer:

It partially ionizes

Explanation:

Higher tier) Weak acids only partially ionise in water. Only a small fraction of their molecules break into hydrogen ions when added to water.

Answer:

4 oxygen atoms

Explanation:

Answer: One sulphuric acid ( H2SO4 ) molecule has 2 hydrogen atoms, 1 sulfur atom, and 4 oxygen atoms.

Answer:

2. 16.4 L

3. 243.6K

4. 0.25mol

Explanation:

Using the ideal gas formula for the series of questions in this case, we have;

PV = nRT

Where;

P = pressure (atm)

V = volume (L)

n = number of moles (mol)

R = gas law constant (0.0821 Latm/molK)

T = temperature (K)

QUESTION 2:

V = ?

P = 5 atm

n = 3 mol

T = 60°C = 60 + 273 = 333K

PV = nRT

5 × V = 3 × 0.0821 × 333

5V = 82.02

V = 82.02/5

V = 16.4 L

QUESTION 3:

P = 4 atm

V = 7.5L

n = 1.5mol

T = ?

PV = nRT

4 × 7.5 = 1.5 × 0.0821 × T

30 = 0.123T

T = 30/0.123

T = 243.6K

QUESTION 4:

P = 2.00 atm

V = 3L

n = ?

T = 25°C = 25 + 273 = 298K

PV = nRT

2 × 3 = n × 0.0821 × 298

6 = 24.47n

n = 6/24.47

n = 0.25mol