If the atomic radius of a calcium crystal is 180 pm, what is the length of the edge of the unit cell? (the calcium crystal forms
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The edge length of a a unit cell of calcium crystal is 509.12 pm.
Structure of the Calcium crystals
Calcium crystal has a face center cubic (FCC) structure.
Edge length of the unit cell
The edge length of the unit cell for face center cubic (FCC) structure is given in the following formula;
a = 2r√2
where;
- a is edge length
- r is the radius
a = 2 x 180 x √2
a = 509.12 pm
Thus, the edge length of a a unit cell of calcium crystal is 509.12 pm.
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relation between edge length (a) and radius (r) is
a = 2√2 r
Given: r = 180 pm
Therefore, a = 2√2 180
= 2 x 1.141 x 180
= 410.76 pm
The length of the edge of the Ca unit cell is 410.76 pm.
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The elements in the middle of the periodic table are known as:a. Noble elementsc. Transition elementsb. Heavy metalsd. Covalent elements
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Answers
b. follow the instructions on the label
c. keep materials in unlabeled containers
d. use chemicals in well ventilated areas
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Justification:
Indeed, keeping materials in unlabeled containers is a risky, dangerous, bad practice.
Labels should be according to international standards. That is, further to the name of the product, labels must signal the danger associated with the product: whether it is poison, toxic, flammable, acid, caustic, explosive, or harmful to the body or the enviroment.
On the other hand, the other options, a. mix chemicals in well ventilated areas, b. follow the instructions on the label, and d. use chemicals in well ventilated areas, are good safety practices, among many others.
Answer: C
Explanation:
Keep materials in unlabeled containers
Answers
6.3 moles ---- ??
atoms = 6.3 * 6.02x10²³
= 3.7926x10²⁴ atoms
hope this helps!
Final answer:
In 6.3 moles of calcium, there are approximately 3.79 x 10²⁴ atoms. This is calculated using Avogadro's number (6.022 x 10²³), which provides the number of atoms in a mole.
Explanation:
To find the number of atoms in 6.3 moles of calcium, you need to use Avogadro's number, which is 6.022 x 10²³. This number, known as Avogadro's constant, is the number of atoms or molecules in one mole of any substance. Therefore, you would calculate the number of atoms as follows:
6.3 moles of calcium × (6.022 x 10²³ atoms/mole) = 3.79 x 10²⁴ calcium atoms.
So, 6.3 moles of calcium have approximately 3.79 x 10²⁴ calcium atoms.
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true or false
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it has so many consequences
False hope this helps
Answers
Answer:
Melting Point.
Explanation:
In testing of a sample has impurities, we have to check the samples’s melting or boiling points or we a separation technique called chromatography.
Now, CaBr_2 which is calcium bromide is a White Hygroscopic Powder. Therefore it is a solid.
Now, a pure solid will always have a fixed melting point which means that it will melt completely at only one temperature.
However, if there are impurities, the melting point of a substance is affected in two ways:
-It's lower than than the fixed melting point
- It would melt at a range of different temperatures as opposed to a fixed temperature for the pure form.
Therefore, a quantity that can be used to determine whether the sample was pure will be melting point.
Final answer:
The student could analyze the melting or boiling point of the sample to determine its purity.
Explanation:
In order to determine whether the sample of is pure, the student can analyze the melting point or boiling point of the compound. The pure compound will have a specific melting and boiling point, while the presence of impurities can cause a change in these values. By comparing the experimental values of the sample with the known values of pure
the student can determine whether the sample is pure or contaminated.
A pure solid, on the other hand, will always have a set melting point, meaning that it will only melt fully at that one temperature. The melting point of a substance, however, is impacted by impurities when it is lower than the fixed melting point. Additionally, in contrast to the pure form's constant temperature, it would melt at a variety of various temperatures.
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