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Rom4ik [11]
3 years ago
12

The metal zirconium becomes superconducting at temperatures below 546 mk. Calculate the temperature at which zirconium becomes s

uperconducting in degrees Celsius. Round your answer to 3 decimal places.
Chemistry
1 answer:
4vir4ik [10]3 years ago
4 0

Answer:

-272.604 °C

Explanation:

The metals can conduct electricity, but this conduction has some resistance, and there're dissipations in the energy during the conduction. Some material has the ability, at very low temperatures, to conduce electricity without the resistance. This ability is called superconducting.

The mK corresponds to the miliKevin, and 1 K = 1000 mK, thus, the temperature in Kevin is 0.546 K.

T(K) = T(°C) + 273.15

T(°C) = T(K) - 273.15

T(°C) = 0.546 - 273.15

T(°C) = -272.604 °C

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If there are 10 navy beans,3 pinto beans,and 17 lentils in a container,what is the percent composition of the container by bean?
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The percent abundance in the container by bean will be 43.33 %  if there are 10 navy beans, 3 pinto beans, and 17 lentils in a container

<h3>What is Percentage composition ?</h3>

The percentage composition of a given compound is defined as the ratio of the amount of each element to the total amount of individual elements present in the compound multiplied by 100.

% composition by bean = number of beans / total number of objects in container x 100

  • Total object = 10 ( navy beans) + 3 (pinto beans) + 17 ( lentils) = 30 objects
  • Total beans = 10 ( navy beans) + 3 (pinto beans) = 13 beans

hence ;

  • % composition by beans = 13/30 x 100 = 43.33 %

Therefore, the percent composition of the container by bean is 43.33 %

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2 years ago
Answers for Chemistry A/Honors Chem A Unit 2 Test
Ivanshal [37]

Intensive properties are useful for identifying a substance simply because these properties do not depend on the amount of sample, nor do they change according to conditions.

The correct answer choice which is a physical property of matter is boiling point.

Polymers are long chains of <u>molecules</u>

The method which I would use to separate two liquids with different boiling points is <u>distillation</u>

The particles are located in the nucleus of an atom are protons and neutrons

The type of molecular model which is used to represent very large molecules like proteins is ribbon diagram

The methods which is used to separate a mixture according to the size of the particles are filtration and chromatography

<h3>What is a mixture?</h3>

A mixture is a substance which contains two or more constituents which can easily be separated by physical means

So therefore, the methods which is used to separate a mixture according to the size of the particles are filtration and chromatography

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1. Calculate the quantity of glucose needed to prepare (a) 250 mL of a 100 mM of
weeeeeb [17]

Answer:

a. mass of glucose required = 4.50 g

b. mass of glucose required = 0.05 g

c. mass of glucose required = 25g

Explanation:

1a. molar mass of glucose = 180.156 g/mol

volume of solution = 250 mL or 250 mL * 1 L/1000 mL = 0.25 L

concentration of solution = 100 mM or 100mM * 1 M/1000 mM = 0.10 M

amount in moles = mass/ molar mass = concentration * volume

mass in grams = concentration * volume * molar mass

mass = 0.10 * 0.25 * 180.156

mass of glucose required = 4.50 g

b. mass concentration of 0.05 % solution = 0.05 g/100 ml = 0.5 g/L

volume of solution = 100 mL = 0.1 L

mass in grams = mass concentration * volume

mass in grams =  0.5 g/L * 0.1 L

mass of glucose required = 0.05 g

c. mass concentration of solution = 50 mg/ mL = 0.05 g/ 0.001 L = 50 g/L

volume of solution = 500 mL = 0.5 L

mass of solute required = concentration * volume

mass required = 50 g/L * 0.5 L

mass of glucose required = 25g

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