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3 years ago

Which compound forms a saturated solution at 40 degrees C that contains 46 grams per 100 grams of water?

1 answer:

6 0

The correct answer for the question that is being presented above is this one: "NH4Cl." The compound that forms a saturated solution at 40 degrees C that contains 46 grams per 100 grams of water is the NH4Cl. <span>Ammonium chloride is an inorganic compound with a white crystalline salt that is highly soluble in water.</span>

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What two factors affect the force of friction?

Sav [38]

Roughness of the surface and weight of the object.

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3 years ago

Read 2 more answers

Corn plants may be tall (TT or Tt) or short (tt). The breeding of two parent corn plants results in offspring that are all tall.

zubka84 [21]

Answer:

Explanation:

The probability that both of the parents are homozygous recessive is zero.
In our case, The gene for tallness is dominant over the gene for dwarfism
Therefore; TT is homozygous dominant while tt is homozygous recessive and Tt is heterozygous.
Heterozygous genotype (Tt) will exhibit a tall phenotype.
When two parents are crossed and all the offsprings are tall then the possible genotype of the parents is either;

Homozygous dominant for both parents or

TT x TT

2. One parent is homozygous dominant and the other is homozygous recessive.

TT x Tt

Therefore, the probability of having both parents as homozygous recessive when all the offspring are tall is Zero.

8 0

3 years ago

Is the temperature of absolute zero measured in celsius A.-373 B.-73 C.-173 D.-273

Andrew [12]

Answer:

Option D is correct = -273 °C

Explanation:

Data given:

Temperature of absolute zero

Absolute Zero in Celsius = ?

Solution:

As we know

internationally the temperature of Absolute zero on kelvin scale = 0 K

So to convert Kelvin temperature to degree Celsius formula will used

T(K) = T(°C) + 273

Rearrange the above equation for °C

T(°C) = T(K) - 273 . . . . (1)

Put value in above eq.1

T(°C) = 0 - 273

T(°C) = -273

So,

The absolute zero in °C = -273

so option D is correct

3 0

3 years ago

In hydrogen peroxide (H2O2), which option best shows how the atoms are ordered?

Snowcat [4.5K]

Answer:

H-O-O-H

Explanation:

8 0

3 years ago

How concentrated can lye solution be before its ph rises above calcium hydroxide saturated water?

mel-nik [20]

The solubility of calcium hydroxide (Ca(OH)2) in water at $20^{o}C$ is 0.02335 <span>mol/L. When a Ca(OH)2 solution has a concentration of 0.02335 mol/L at the said temperature, a saturated solution is formed.

Upon dissolution and dissociation of 1 mole Ca(OH)2, 1 mole of calcium ion (</span> $Ca^{+2}$ ) and 2 moles of hydroxide ions ( $OH^{-1}$ ) are formed. The concentration of the hydroxide ions determine the pH of the solution. This same concentration would be needed in calculating the concentration of lye solution needed.

1. To calculate the pH of the solution, a few approaches are possible. Here, the pOH of the solution is calculated first using the molar concentration of $OH^{-1}$ ions. Because pH + pOH = 14, the pH of the solution can then be calculated by subtracting pOH from 14.

Because 2 moles of $OH^{-1}$ ions are formed per mole of Ca(OH)2 dissolved, the pOH of a saturated Ca(OH)2 solution at $20^{o}C$ is,

*Concentration ( $C_{OH_{1}}$ ) of $OH^{-1}$ ions,
$C_{OH_{1}}$ = 0.02335 mol Ca(OH)2/L * 2 mol $OH^{-1}$ / 1 mol Ca(OH)2
$C_{OH_{1}}$ = 0.0467 mol $OH^{-1}$ /L

*pOH of saturated Ca(OH)2 solution,
    pOH = -log [ $C_{OH_{1}}$ ]
  pOH = -log [0.0467 mol $OH^{-1}$ /L ]
  pOH = 1.33

*pH of saturated Ca(OH)2 solution,
      pH = 14 - 1.33
  pH = 12.67

2. To find the concentration of lye (NaOH) solution that would give the same pH as a saturated Ca(OH)2 solution at the same temperature, the pOH of the saturated Ca(OH)2 solution will be used.

For every mole of NaOH that dissolves and dissociates, 1 mole of $OH^{-1}$ ions is formed. Thus,

*Concentration ( $C_{OH_{2}}$ ) of $OH^{-1}$ ions,
pOH = -log [ $C_{OH_{2}}$ ]
   1.33 = -log [ $C_{OH_{2}}$ ]
   $C_{OH_{2}}$ = 10^-1.33
   $C_{OH_{2}}$ = 0.0467 mol $OH^{-1}$ / L

Because 1 mole of NaOH produces only 1 mole of $OH^{-1}$ ions, the concentration of the $OH^{-1}$ ions should then be equal to the concentration of the lye (NaOH) solution. Thus, 0.0467 mol/L of lye would give the same pH as that of 0.0233 mol/L (saturated) Ca(OH)2 solution at $20^{o}C$ . The pH of both solutions is 12.67.

7 0

3 years ago