Which actions would increase the rate at which salt dissolves in water? Stir the water. Crush the salt. Use less water. Heat the water. Cool the salt.

Answers

Answer 1

Answer:

Answer:

Crushing or grinding increases the surface area of the salt that is exposed to the molecules of water. Stirring increases the speed at which the particles of salt come in contact with the water molecules.

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Which of the following are criteria for classifying chemical reactions? Multiple select question. 1. reversibility or irreversibility 2. changes in chemical name 3. changes in chemical structure 4. changes in chemical energy

Answers

The criteria for classifying chemical reactions include reversibility or irreversibility, changes in chemical name, changes in chemical structure, and changes in chemical energy.

Final answer:

Chemical reactions can be classified based on patterns such as reversibility or irreversibility, changes in chemical structure, and changes in chemical energy. These changes can refer to the reaction direction, molecular rearrangements, and energy transformations.

Explanation:

The criteria for classifying chemical reactions are notable patterns of behavior and include factors such as reversibility or irreversibility, changes in chemical structure, and changes in chemical energy. For instance, reversibility or irreversibility refers to the direction in which the reaction takes place. A reaction may synthesize into a product and then decompose back into the reactants, an instance of reversible reaction.

Changes in chemical structure involve a transformation in the arrangements of atoms in the reactants and the products. For instance, in a chemical reaction involving the transfer of hydrogen ions between reactants, the structure of the molecules changes.

Changes in chemical energy denote transformations involving energy, either by absorption or release, accompanying the reaction process. This is a characteristic feature of exergonic and endergonic reactions. For instance, in an exergonic reaction, energy is released due to the reaction.

Learn more about Classifying Chemical Reactions here:

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Find the product.
(n + 8)(n - 2)
n2- 6n - 16
n2+ 6n - 16
n2- 6n + 16

Answers

Answer:The product of the given expression is : $n^2+6n-16$

Explanation:

Given expression:(n + 8)(n - 2)

Using identity: $(a+b)(a+c)=a^2+(b+c)a+bc$

a = n, b=8, c= (-2)

$n^2+(8+(-2))n+(8)(-2)$

$n^2+6n-16$

The product of the given expression is : $n^2+6n-16$

Answer : The product of the given expression is:

$n^2+6n-16$

Explanation :

The given expression is:

$(n+8)(n-2)$

First we have to open the bracket by multiplying the terms.

$n^2-2n+8n-16$

Now we are adding like terms.

$n^2+6n-16$

Hence, the product of the given expression is, $n^2+6n-16$

Which pair below describes isotopes of the same element? A) an atom with 6 protons and 8 neutrons - an atom with 8 protons and 6 neutrons
B) an atom with 6 protons and 6 neutrons - an atom with 6 protons and 7 neutrons
C) an atom with 8 protons and 8 neutrons - an atom with 7 protons and 8 neutrons
D) an atom with 7 protons and 6 neutrons - an atom with 6 protons and 6 neutrons

Answers

Answer: The correct answer is Option B.

Explanation:

Isotope is defined as the chemical specie which belong to the same element but differ in their molecular mass.

The isotopes have same atomic mass but differ in their mass numbers

Atomic number is defined as the number of protons or electrons that are present in a neutral atom.

Atomic number = number of protons = number of electrons

Mass number is defined as the sum of number of protons and neutrons that are present in an atom.

Mass number = Number of protons + Number of neutrons

Thus, isotopes of an element has same number of protons but they differ in the number of neutrons.

For Example: Chlorine has 2 isotopes, $_(17)^(35)\textrm{Cl}\text{ and }_(17)^(37)\textrm{Cl}$

In $_(17)^(35)\textrm{Cl}$ isotope:

Number of protons = 17

Number of neutrons = 35 - 17 = 18

In $_(17)^(37)\textrm{Cl}$ isotope:

Number of protons = 17

Number of neutrons = 37 - 17 = 20

Hence, the correct answer is Option B.

B because isotopes have the same number of protons but a different number of neutrons

The valence electrons occur in what part of the atom?a. the nucleus
b. in each electron shell
c. the outer electron shell
d. the innermost electron shell

Answers

The correct answer to the question that is stated above is letter c, the outer electron shell.

Valence electrons occur in the outermost shells of an atom.

>> Valence electrons are electrons that are associated with an atom, and that can participate in the formation of a chemical bond.

Describe the conditions under which a real gas is most likely to behave ideally

Answers

Answer:

The conditions under which a real gas is most likely to behave ideally is at low pressure and hight temperatures.

Explanation:

According to molecular kinetic theory, 1) gas particles (molecules or atoms) occupy a negligible fraction of the total volume of the gas, and 2) the force of attraction between gas molecules is zero.

Those two assumptions constitute the basis for the behavior of a gas and an ideal gas.

The lower the pressure and the higher the temperature the closer those assumptions are valid for real gases.

At low pressure, the particles of the gas will be more separated from each other and so the tiny volume they occupy will be a smaller fraction of the total volume.

At higher temperatures, the particles will have more kinetic energy, which means that they will have larger average speed, and so the forces between the molecules will count less.

So, you conclude that under low pressure and high temperatures a real gas is most likely to behave ideally.

In the late 1800s, the British scientist J. J. Thomson discovered that atoms were composed of positively-charged and negatively-charged particles. He proposed that these two types of particles were evenly mixed throughout the structure of the atom. How does this atomic model differ from current atomic models?A. Current atomic models show that atoms do not have positively-charged particles.

B. Current atomic models show an atom's positively-charged particles concentrated in the center of the atom.

C. Current atomic models show that atoms do not have negatively-charged particles.

Answers

Option B.

Current atomic models show the positive charged particles (protons) concentrated in the center (nucleus) of the atom, along with the neutrons, and the negative charged particles (electrons) distributed around (far from) the nucleus.

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EnergyThe energy needed to remove an electron from an atom is calledelectronegativevalenceejectionionization

Which type of bond is found between atoms of solid cobalt?(1) nonpolar covalent (2) polar covalent (3) metallic (4) Ionic

Which formula represents a molecule with the most polar bond