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3 years ago

How can heat energy transform from mechanical energy?

2 answers:

5 0

I think it might be B because the mechanical energy can convert into heat and the heat converts to some mechanical energy. Mechanical is similar to heat. This means that’ one is able to change the internal energy of a system by either physically putting work to the system or adding heat to the system. It seems to me that motion is similar to friction because friction is caused by motion. honestly i’m not sure if this is right but i tried my best. i’m so sorry if i get this wrong

kirill [66]3 years ago

3 0

Answer:

Explanation:

brainliest pls

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Can someone please help me with this Chem lab?

Jlenok [28]

Answer:

sooo dificult

Explanation:

4 0

3 years ago

A student prepared several aqueous sodium chloride (NaCl) solutions to observe boiling point elevation at various molal concentr

NNADVOKAT [17]

The question is incomplete, the complete question is;

A student prepared several aqueous sodium chloride (NaCl) solutions to observe boiling point elevation at various molal concentrations, however, several errors were made throughout the procedure. Determine whether these errors would cause the observed boiling point to be increased or decreased relative to the expected boiling point, based on the procedure, or have no effect on the experimental results.

* The flask is washed with water but not thoroughly dried before preparing the solution

* The mass of NaCl used to prepare the solution is 5.400 grams instead of 4.400 grams

* Some of the prepared solution splashes out of the flask prior to observation of the boiling point

* When making the salt solution, 55.0 milliliters of water is added instead of 50.0 milliliters

Answer:

The flask is washed with water but not thoroughly dried before preparing the solution - decrease

The mass of NaCl used to prepare the solution is 5.400 grams instead of 4.400 grams

-increase

Some of the prepared solution splashes out of the flask prior to observation of the boiling point- have no effect

When making the salt solution, 55.0 milliliters of water is added instead of 50.0 milliliters- decrease

Explanation:

If the flask is washed but not dried, then the solution will be further diluted than expected. As a result of this further dilution, the observed boiling point will be less than the expected boiling point because the boiling point depends on the solution's concentration.

If more solute is added than expected, the concentration of the solution is increased and the boiling point also increases above the expected boiling point due to the increase in amount of solute present.

If some of the solution splashes out of the flask prior to boiling, the boiling point is not affected because the concentration of the solution was not altered. The boiling point only changes when the concentration of the solution is changed.

If 55 ml of water is added instead of 50 ml, the solution is now more dilute than expected thereby reducing the concentration of the solution and the boiling point. Remember that, as the concentration of the solution decreases, the boiling point decreases accordingly.

8 0

3 years ago

Dacă intr-o scoica se introduc câteva picături de acid se observa apariția efervescenței. Scoica conține carbonat de calciu.Daca

Step2247 [10]

Answer:

Explanation:

In English;

If a few drops of acid are introduced into a shell, the effervescence may be observed. The shell contains calcium carbonate.If 1.46g of hydrochloric acid have been introduced, what quantities of reaction products are obtained?

Given parameters:

Mass of HCl = 1.46g

Unknown:

Mass of CO₂ produced = ?

Mass of H₂O produced =?

Mass of CaCl₂ produced = ?

Solution

The balanced reaction equation is given below:

CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O

The effervescence observed is due to the production of carbon dioxide gas.

In order to find the mass of each of the products obtain, we must first express the known mass of the acid in terms of moles:

number of moles of HCl = $\frac{mass of HCl}{molar mass of HCl}$

Molar mass of HCl = 1 + 35.5 = 36.5g/mol

number of moles of HCl = $\frac{1.46}{36.5}$ = 0.04mole

Now, we must find the number of moles of each of the products obtained

number of moles of CaCl₂:

2 moles of HCl produced 1 mole of CaCl₂

0.04 moles of HCl will produce $\frac{0.04}{2}$ moles = 0.02moles of CaCl₂

Also, number of mole of H₂O is 0.02moles

number of mole of CO₂ is 0.02moles

Mass of the products:

Mass of CaCl₂ = number of moles of CaCl₂ x molar mass of CaCl₂

molar mass of CaCl₂ = 40 + 2(35.5) = 111g/mol

mass of CaCl₂ = 0.02 x 111 = 2.22g

Mass of H₂O = number of moles of H₂O x molar mass of H₂O

molar mass of H₂O = 2(1) + 16= 18g/mol

mass of H₂O = 0.02 x 18 = 0.36g

Mass of CO₂ = number of moles of CO₂ x molar mass of CO₂

molar mass of CO₂ = 12 + 2(16) = 44g/mol

mass of CO₂ = 0.02 x 44 = 0.88g

5 0

4 years ago

Help me please I need to pass.

nlexa [21]

Answer:

2 C Atoms

Explanation:

When you have coefficient of 2 next to a compound element, it indicates there are 2 of each compound element. In the compound element, there is one C Atom, and 2×1 is 2.

4 0

3 years ago

An astronomer has proposed a new theory about the evolution of the universe. What is the next step that the astronomer should ta

tatiyna

Test his theory like a model theory or research more common ideas

4 0

3 years ago

Read 2 more answers