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3 years ago

During heat transfer, thermal energy always moves in the same direction: A. COLDHOT B. HOT COLD C. No movement D. HOTHOT

Chemistry

1 answer:

drek231 [11]3 years ago

6 0

Answer: Option (B) is the correct answer.

Explanation:

Thermal energy is defined as the energy present within the molecules of a substance.

Also, when two objects that have different temperature and they are in contact with each other then heat will always flow from hot object to cold object.

For example, if a metal spoon is placed in a hot cup of coffee then heat will flow from hot coffee to the metal spoon.

Therefore, we can conclude that during heat transfer, thermal energy always moves in the same direction: HOT COLD.

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If you have 0.30 moles of gas that has a volume of 7.5 L, how many moles of gas will you need to have a volume of 30.0 L?

Y_Kistochka [10]

Answer:

$187.$

Explanation:

$7.5 \div 0.30 = 25$

$7.5 \times 25 = 187.5$

6 0

3 years ago

When 100 cm3 of a saturated solution of KClO3 at 40°C is evaporated, 14.0g of the salt is recovered. What is the solubility of K

strojnjashka [21]

Explanation:

kclo3- 39+35.5+16*3=122.5

molar mass = 122.5

mass = 14.0g

volume= 100cm3

solubility in mol/dm3 or molarity = ?

but we know that

no of moles = solubility in mol/dm3×vol in cm3

---------------------------------------------

1000

no of moles = mass

---------

molar mass

mass\molar mass= solubility in mol/dm3 *vol in cm3/ 1000

14.0/122.5=x * 100/1000

solubility =0.875 mol/dm3

5 0

4 years ago

How are molecules built?

marin [14]

Answer:

By bonding due to the attractive forces

8 0

3 years ago

What is the mole ratio of D to A in the generic chemical reaction? 4A + B --> C + D

storchak [24]

<h3>Answer:</h3>

Mole ratio of D to A is 1 : 4

<h3>Explanation:</h3>

We are given the generic chemical equation;

4A + B → C + D

We are supposed to determine the mole ratio of D to A

What is mole ratio?

Mole ratio is the ratio of the number of moles of reactants or products in a chemical reaction.
We determine the mole ratio using the coefficients of reactants or products in question.

For example;

In the equation, 4A + B → C + D, the coefficient of A is 4 while the coefficient of D is 1.
This means, 4 moles of A reacts with 1 mole of b to produce 1 mole of C and 1 mole of D
Thus, mole ratio of D to A is 1 : 4

6 0

3 years ago

An essential utensil for various tasks from cleaning vegatables to training pasta ir tin contents

zavuch27 [327]

Correct question: A tool used for vegetable strainer,it is essential for various tasks from cleaning vegetables to straining pasta or tin contents.

Answer: The tool is called COLANDER.

Explanation:

In the kitchen, there are different types of equipments and utensils which makes work easier and faster. Examples of such equipment/ utensils includes:

--> graters,

--> cutleries ( spoon, fork, knife)

--> colanders

--> Pots

--> Blenders

These utensils are made up of rubber, plastics, wood, ceramics and stainless steel.

A Colander is an important kitchen utensil, a type of strainer with perforated holes. The holes allows fluid to drain leaving behind the solid part. It is usually bowl - shaped. It helps in performing the following roles in the kitchen:

--> cleaning vegetables

--> straining of pasta

--> straining of tin contents

Colanders are usually made of stainless steel, plastics and ceramics.

4 0

3 years ago