CHEMISTRY HIGH SCHOOL

Which best characterizes a crystal

Answers

Answer 1
Answer: A dense substance that is hard and imcompressible.
Answer 2
Answer:

Answer;

A dense substance that is hard and incompressible

Explanation;

  • Crystals are solids that are made up of particles such as molecules, atoms or ions, which are arrange in a highly ordered microscopic structure, forming a crystal lattice which extends in all directions.
  • Examples of crystals include quartz, that is made up of silicon (iV) oxide molecules that are arranged in a lattice,table salt is another example that is made up of sodium and chloride ions that are arranged in a lattice
  • Crystals are very ordered, they may be made up of atoms of the same elements or atoms of different elements such as in the case of table salt.

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The element with 8 electrons in its 3d sublevel isa. O.
b. Ne.
c. Ar.
d. Ni.

Answers

According to the electronic configuration, the element with 8 electrons in its 3 d sublevel is nickel.

What is electronic configuration?

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

Learn more about electronic configuration,here:

brainly.com/question/13497372

#SPJ2

The element with 8 electrons in its 3d sublevel is Ni, Nickel. The answer is letter D. The rest of the choices do not answer the question above. 

Which of the following is not true of "concentration"?a. It increases when you add more solute to the solvent.
b. It decreases when you add more solute to the solvent.
c. It decreases when you add more solvent to the solution.

Answers

The correct answer is B. The concentration of a solution does not decreases when you add more solute to the solvent. Instead, the concentration increases. Concentration is expressed as the amount of solute per unit of solvent. Therefore, increasing the solute, increases this value and increasing the solvent, decreases this value.

What happens if you overmix muffins?

Answers

Answer: When you overmix the muffin batter, it crushes the air bubbles and ruins the fluffy texture.

Explanation: → Follow this tip: To ensure a batch of light, fluffy muffins, mix the dry ingredients with the wet ingredients until just barely combined, and no more dry flour is visible.
The batter is going to be tasting bad and gross

Imagine placing an ice cube in a bowl of hot soup. Would the heat energy transfer from the ince cube to the soup or from the soup to the ice cube? Explain your answer

Answers

Answer: from the soup to the ice

Explanation: The heat energy from the soup truly transfers to the ice cube when you put it in a bowl of hot soup. An object with a greater temperature will always transfer heat to an object with a lower temperature. In this instance, the hot soup has a higher temperature than the ice cube due to its higher thermal energy content. The ice cube melts as a result of the heat energy moving from the soup to it, and the soup cools as a result.

Determine the pressure exerted by 0.352 mol of oxygen gas in a 1.75 L container at room temperature (25 degrees Celsius). Show all your work!​

Answers

Answer:

P = 4.92 atm

Explanation:

Given data:

Number of mole of oxygen = 0.352 mol

Volume of gas = 1.75 L

Temperature = 25°C

Pressure exerted by gas = ?

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

Now we will convert the temperature.

25+273 = 298 K

P × 1.75 L = 0.352 mol  × 0.0821 atm.L/ mol.K   ×298 K

P = 8.61 atm.L /  1.75 L

P = 4.92 atm

An aqueous solution of methyl alcohol (molar mass = 32.05 g/mol) is prepared by dissolving 15.0 mL of the alcohol (d = 0.792 g/mL) in 75.0 mL of water (1.00 g/mL).a. Calculate the mass % of the aqueous alcohol solution.
b. Calculate the molarity of the aqueous alcohol solution.
c. If 5.0 mL of the solution (above) is diluted to a volume of 50.0 mL, what is the molarity (M) of the resulting dilute solution?

Answers

A. The mass% of the aqueous alcohol solution is 13.69%(wt/wt). The solution to this is:

mass alcohol = 15.0mL (0.792 g/mL) = 11.9 grams alcohol
mass water = 75.0mL (1.00 g/mL) = 75.0 grams water
total mass = 11.9 + 75.0 = 86.9 grams solution
mass% of methanol = (11.9/86.9)*100% = 13.69%

B. Molarity = 4.125 M

Solution:

Molarity = mole solute/L solution
mole solute = 11.9/32.05 = 0.3713 moles
L solution = 15 + 75 = 90 mL/1000 = 0.09 L

M = 0.3713/0.09 = 4.125

C. Answer is 0.4125 M

Solution:

C1V1 = C2V2
4.125(5mL) = C2(50mL)
C2 = 0.4125 M
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