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4 years ago

How many significant figures does the following number contain: 385.01

Chemistry

1 answer:

dusya [7]4 years ago

3 0

Answer:

5 significant figures

Explanation:

Zeros that come before any non-zero digits are never significant.

Zeros that are in between any non-zero digits are always significant.

Zeros that come after any non-zero digit are ONLY significant if a decimal point in present somewhere in the number. (In this case there is a decimal point, but there aren't any zeros at the end of this number.)

I have underlined the significant figures in this number:

3 8 5 . 0 1

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Solid cesium iodide has the same kind of crystal structure as CsCl which is pictured below: If the edge length of the unit cell

Assoli18 [71]

The question is incomplete, here is the complete question:

Solid cesium iodide has the same kind of crystal structure as CsCl which is pictured below: If the edge length of the unit cell is 456.2 pm, what is the density of CsI in $g/cm^3$

The image is attached below.

Answer: The density of CsI is $9.09g/cm^3$

Explanation:

To calculate the density of metal, we use the equation:

$\rho=\frac{Z\times M}{N_{A}\times a^{3}}$

where,

$\rho$ = density

Z = number of atom in unit cell = 2 (BCC)

M = atomic mass of CsI = 259.8 g/mol

$N_{A}$ = Avogadro's number = $6.022\times 10^{23}$

a = edge length of unit cell = $456.2pm=456.2\times 10^{-10}cm$ (Conversion factor: $1cm=10^{10}pm$ )

Putting values in above equation, we get:

$\rho=\frac{1\times 259.8}{6.022\times 10^{23}\times (456.2\times 10^{-10})^3}\\\\\rho=9.09g/cm^3$

Hence, the density of CsI is $9.09g/cm^3$

3 0

3 years ago

If 180 grams of potassium iodide is dissolved in 100 cm3 of water at 30oC, a(n) _______________ solution is formed.

olga nikolaevna [1]

Super saturated solution is formed.

Explanation:

Solubility is the property of any substance's capacity, that is the solute of the substance is dissolved in the given solvent to form the solution. We have three different types of solution, unsaturated, saturated and supersaturated solution.

Unsaturated solution is a solution with lesser amount of solute than its solubility at equilibrium.

Saturated solution is a solution with the maximum solute dissolved in the solvent.

Super saturated solution is a solution with more solute than it is required.

The solubility of KI at 30°C is 153 g / 100 ml. Here 180 g of KI in 100 ml of water at 30°C is given, which has more solute than required, so it is super saturated solution.

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3 years ago

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Making a pancake from batter is an example of blank change

lesantik [10]

Answer is: chemical.

Making a pancake from batter is chemical change (chemical reaction), because new substances are formed, the atoms are rearranged and the reaction is followed by an energy change.

Batter is thin dough that is poured into a pan to make pancakes.

In physical change, the same substance is present before and after the psysical change, just with different form or state of matter.

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3 years ago

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In-Lab Question 5a. Comparing your actual mass to the calculated target mass, would you predict the absorbance of your solution

Aleonysh [2.5K]

Answer:

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Explanation:

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3 years ago

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suter [353]

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4 years ago