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3 years ago

A hiker with hypothermia has a body temperature of 82 °F. What is his body temperature in °C?

Chemistry

1 answer:

Setler [38]3 years ago

7 0

Answer:

28ºC

Explanation:

Formula for converting Fahrenheit to Celsius is (°F − 32) × 5/9 = °C

(82 − 32) × 5/9 = x

(50) × 5/9 = x

27.777...ºC = x

x ≈ 28ºC

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Select the supplements that are minerals.

Jet001 [13]

<h3> The supplements that are minerals are</h3>

calcium
sodium
iron
zinc

Explanation

calcium and sodium are major minerals which are required by the body for

calcium- needed for muscle,hearing bone and for the support of synthesis and function of cells

sodium- is needed to control blood pressure and also for proper muscle and nerve function

Zinc and iron are required in trace and both are needed for good health

3 0

3 years ago

Given that the freezing point depression constant for water is 1.86°c kg/mol, calculate the change in freezing point for a 0.907

melamori03 [73]

Answer : The correct answer for change in freezing point = 1.69 ° C

Freezing point depression :

It is defined as depression in freezing point of solvent when volatile or non volatile solute is added .

SO when any solute is added freezing point of solution is less than freezing point of pure solvent . This depression in freezing point is directly proportional to molal concentration of solute .

It can be expressed as :

ΔTf = Freezing point of pure solvent - freezing point of solution = i* kf * m

Where : ΔTf = change in freezing point (°C)

i = Von't Hoff factor

kf =molal freezing point depression constant of solvent. $\frac{^0 C}{m}$

m = molality of solute (m or $\frac{mol}{Kg}$ )

Given : kf = 1.86 $\frac{^0 C*Kg}{mol}$

m = 0.907 $\frac{mol}{Kg}$ )

Von't Hoff factor for non volatile solute is always = 1 .Since the sugar is non volatile solute , so i = 1

Plugging value in expression :

ΔTf = 1* 1.86 $\frac{^0 C*Kg}{mol}$ * 0.907 $\frac{mol}{Kg}$ )

ΔTf = 1.69 ° C

Hence change in freezing point = 1.69 °C

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3 years ago

How many ions are in Li + Cl

Amanda [17]

It contains 5 ions.

Hope that helped!!

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3 years ago

What distinguishes a mixture from an impure substance?

Leno4ka [110]

Answer: Mixture can be separated into its components but impure substance cannot be separated into components.

Explanation:

A mixture is defined as a combination of two or more different substances in which the component substances are individually distinct. The substances can be separated by physical processes. The separation dos not involve any chemical process because no new substance is being formed.

Impure substance is defined as a substance which can be mixture of elements, compounds or elements and compounds. The substances cannot be separated by physical means but can only be separated by chemical means.

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3 years ago

What does the octet rule have to deal with covalent bonds

irga5000 [103]

Rule of the octet is used in chemistry to indicate the tendencies of the atoms when they complete the energy level to obtain stability. Covalent bonds are what occurs when two atoms join and reach the stable octet. They are related because through this union electrons are shared and the covalent bond is produced and the rule of the octet is given to show the tendency of this union.

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3 years ago