A heterogeneous mixture is one in which substances are evenly distributed and have a uniform composition

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Answer 1

Answer: If you’re asking if this is true or false, it is false . A HOMOGENEOUS mixture is one the where the substances are evenly distributed and have a uniform composition, while a HETEROGENEOUS mixture is uneven and the substances are part from each like oil and water.

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What was the optimal mix of hydrogen and oxygen to launch the pipette rockets in the Combustion lab?

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Answer:

The best mixture is 2 hydrogens and 1 oxygen.

A certain reaction has an activation energy of 66.41 kJ/mol. At what Kelvin temperature will the reaction proceed 3.00 times faster than it did at 293 K?

Answers

Answer : The temperature will be, 392.462 K

Explanation :

According to the Arrhenius equation,

$K=A* e^{(-Ea)/(RT)}$

or,

$\log ((K_2)/(K_1))=(Ea)/(2.303* R)[(1)/(T_1)-(1)/(T_2)]$

where,

$K_1$ = rate constant at $T_1$ = $K_1$

$K_2$ = rate constant at $T_2$ = $3K_1$

$Ea$ = activation energy for the reaction = 66.41 kJ/mole = 66410 J/mole

R = gas constant = 8.314 J/mole.K

$T_1$ = initial temperature = 293 K

$T_2$ = final temperature = ?

Now put all the given values in this formula, we get:

$\log ((3K_1)/(K_1))=(66410J/mole)/(2.303* 8.314J/mole.K)[(1)/(293K)-(1)/(T_2)]$

$T_2=392.462K$

Therefore, the temperature will be, 392.462 K

Which of the following best describes how chemical changes differ from physical changes?A. Physical changes produce no new substances and chemical changes do.
B. Physical changes always involve the formation of a gas while chemical changes may not.
C. Physical changes can occur inside or outside the substance; chemical changes always occur outside.
D. Physical changes involve a change of state; chemical changes involve a change of shape.

Answers

Answer:

A is the answer.

Explanation:

Physical changes do not change the substance's composition but just the outside qualities. However, chemical changes change the composition of the substance and it's chemical properties.

Answer:

Explanation:

What is the Bond Type and Molecular polarity of PCl3?

Answers

It is covalent bonding. The electrons are shared between the phosphorus and the chlorines.

covalent bonding is when electrons are shared between two elements.

molecular polarity is a little bit complicated, but I will try to explain ;)
PCl3 is an alternation on tetrahedral molecules.
It means that P has one lone pair of electrons. This pair of electrons are only attracted to the P nuclei and thus a greater freedom of motion.
This means that their orbital is bigger and this pushes the 3 Cl atoms closer together.
The angle between each Cl now is 107 and the angle between Cls and P is greater than 107.
Now, due to this shape, and also electronegativity (Cl is more electronegative than P meaning that it tends to hog the electrons they share closer to itself), PCl3 is polar. Electrons that are shared tend to flow closer towards the Cl than the P side.
Therefore, on the Cl side of the molecule it's, more negative. On the P side, it's more positive.

In the given question, bond type for the molecule $\rm PCl_3$ is covalent bond and molecular polarity of $\rm PCl_3$ is polar in nature, respectively.

Polarity is caused if it has an uneven distribution of electrons, causing one end of the molecule to be slightly positive and the other end to be slightly negative.

The bond type of $\rm PCl_3$ is covalent. Covalent bonds form when atoms share electrons to achieve a more stable electron configuration. In $\rm PCl_3$ , the phosphorus atom shares three of its valence electrons with three chlorine atoms to form three covalent bonds.

The molecular polarity of $\rm PCl_3$ is polar. In $\rm PCl_3$ , the three chlorine atoms exert a stronger pull on the shared electrons, causing them to be slightly negative, while the phosphorus atom is slightly positive. This creates a dipole moment, making the molecule polar.

Therefore, $\rm PCl_3$ has covalent bonds and it is a polar molecule.

Learn more about Polarity here:

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What trend does electronegativity follow, going down the periodic table?A. Electronegativity increases because there are more total electrons
in the atom.
B. Electronegativity increases because there are more valence
electrons in the atom.
C. Electronegativity decreases because the valence electrons are
farther from the nucleus.
D. Electronegativity decreases because the size of the nucleus is
bigger.

Answers

Electronegativity decreases because the valence electrons are farther from the nucleus. Hence, option C is correct.

What is electronegativity?

Electronegativity is a chemical property that describes the tendency of an atom or a functional group to attract electrons toward itself.

From top to bottom down a group, electronegativity decreases. This is because atomic number increases down a group, and thus there is an increased distance between the valence electrons and nucleus, or a greater atomic radius.

Important exceptions to the above rules include the noble gases, lanthanides, and actinides.

Electronegativity decreases because the valence electrons are farther from the nucleus. Hence, option C is correct.

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Justify water is compound

Answers

Water is a compound. A compound is made up of two or more elements. In the case of water, or H2O, there are 2 hydrogen atoms present and 1 oxygen atom. I hope this helps you on your assignment. Good luck!

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