CHEMISTRY HIGH SCHOOL

The smallest group of particles in a crystal that retains the shape of the crystal is called theA.cube
B.unit cell
C.cage
D.crystal lattice

Answers

Answer 1
Answer:

Answer:

The correct answer is B.unit cell

Explanation:

An unit cell is an arrangement of particles (atoms, ions or molecules) in a crystal structure. The repetition of the unit cell reproduces the complete crystalline structure of the solid. Depending on how are located the particles, there are different unit cells, for exaple: simple cubic, body-centered cubic, face-centered cubic.

Answer 2
Answer: The answer is B. Unit cell.
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Molecules in food contain chemical energy that cells use to produce ____________________. (1 point

Answers

Molecules in food contain chemical energy that cells use to produce ATP = adenosine triphosphate. 

Answer:

Molecules in food contain chemical energy that cells use to produce Adenosine triphosphate ATP. Respiration is that the method by that cell get energy within the sort of ATP. Adenosine triphosphate captures energy obtained from the breakdown of food molecules and releases it to fuel alternative cellular processes. ATP, is that the primary carrier of energy in cells. Once energy is required by the cell, it's born-again from storage molecules into ATP.

Mass measures the amount of matter in an object

the weight of an object

gravity's effects on an object

the size of an object

Answers

Mass measures the amount of matter in an object... It would be weight that records the gravitational effect on an object.

A sample containing 4.80 g of O2 gas has an initial volume of 15.0 L. What is the final volume, in liters, when each of the following changes occurs in the quantity of the gas at a constant pressure and temperature?A. A sample of 0.500 mole of O2 is added to the 4.80 g of O2 in the container.
B. A sample of 2.00 g of O2 is removed.
C. A sample of 4.00 g of O2 is added to the 4.80 g of O2 gas in the container.

Answers

The correct answer for the question that is being presented above is this one: "A. A sample of 0.500 mole of O2 is added to the 4.80 g of O2 in the container." A sample containing 4.80 g of O2 gas has an initial volume of 15.0 L. The final volume, in liters, when each of the following changes occurs in the quantity of the gas at a constant pressure and temperature is that A sample of 0.500 mole of O2 is added to the 4.80 g of O2 in the container.

Final answer:

By using the ideal gas law and molar mass calculations, the final volumes are found to be A. 65.0 L, B. 8.75 L, and C. 27.5 L.

Explanation:

To calculate the final volume when additional O2 is added or when some O2 is removed, we can use the concept of the molar mass and the ideal gas law that states that volume is directly proportional to the amount of gas, assuming pressure and temperature is constant.

The molar mass of O2 is approximately 32.00 g/mol.

A. 0.500 moles of O2 is added. This equals 0.500 * 32 g = 16 g. The total mass in the system is now 20.8 g. If the original 15.0 L represented 4.80 g, now 20.8 g would represent 15.0 L * 20.8/4.80 = 65.0 L.

B. 2.00 g of O2 is removed. So, the total mass in the system is now 2.80 g. If the original 15.0 L represented 4.80 g, now 2.80 g would represent 15.0 L * 2.80/4.80 = 8.75 L.

C. 4.00 g of O2 is added. So, the total mass in the system is now 8.80 g. If the original 15.0 L represented 4.80 g, now 8.80 g would represent 15.0 L * 8.80/4.80 = 27.5 L.

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The figure shows a nutrition label. How much energy does this food contain?

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Answer:

i need help with that too.

Explanation:

An atom of lithium 7 has an equal number of

Answers

Electrons and protons
Lithium 7 has an equal number of protons and neutrons. 

The chemical formula for emerald is Be3Al2(SiO3)6. An emerald can be described asa pure substance because it is a compound.
a pure substance because it is an element.
an impure substance because it is chemically combined.
an impure substance because it is a mixture.

Answers

Answer is: a pure substance because it is a compound.

Pure substance is made of only one type of atom or only one type of molecule, it has definite and constant composition with distinct chemical properties.

Emerald (beryl) is chemical compound (beryllium aluminium cyclosilicate) with the chemical formula Be₃Al₂(SiO₃)₆.  Pure beryl is colorless.

An emerald can be described as an impure substance because it is a mixture. Therefore, option D is correct.

The chemical formula for emerald is Be₃Al₂(SiO₃)₆, indicating that it is a compound composed of beryllium (Be), aluminum (Al), and silicon (Si) atoms bonded to oxygen (O) atoms.

However, emeralds can also contain impurities or trace elements such as chromium (Cr) or vanadium (V), which give them their characteristic green color.

These impurities or trace elements are present in small amounts and are incorporated into the crystal structure of the emerald.

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