# Why do cars need a cooling system in conjunction with the engine? A) the transformation of energy in the engine produces a lot of waste heat B) sunlight makes the engine heat up quickly C) friction from the road makes the engine hotter than is safe

2 months ago

## Solution 1

Guest #1850
2 months ago
A.
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## ðŸ“š Related Questions

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According to the law of conservation of energy, energy can only be _______, not created or destroyed. A) destroyed B) transformed C) reduced
Solution 1
B. Energy can only be transformed
Question
In a titration of 0.35 M HCl and 0.35 M NaOH, how much NaOH should be added to 45.0 ml of HCl to completely neutralize the acid?
Solution 1
It would be the same amount. So, 45 ml of NaOH is required to be added to the 45 ml of HCI to neutralize the acid fully. Here is a brief calculation:

Firstly, here is your formula: M(HCI) x V(HCI) = M(NaOh) x V(NaOH)Â
With the values put in: 0.35 x 45 = 0.35 x V(NaOH)Â
= 45 ml.Â
There is 45 ml of V(NaOH)

Let me know if you need anything else. :)

Â  Â  Â  Â  Â  Â - Dotz
Question
What is the relationship between the size of an object and the amount of friction that is present
Solution 1
If an object is heavier with a greater mass, then its friction levels will also increase. This is due to the force of gravity. Speaking of its size, it depends on its weight. So basically, if the object is only physically big but has a low mass, then it barely has a relationship with friction. However, if it is big or small with a heavy weight, then the amount of friction will be more.Â

Let me know if you need anything else.Â
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Â  Â  Â  Â  Â  Â  Â  Â  Â  Â - Dotz :)
Question
The chemical equation below shows the decomposition of nitrogen triiodide (NI3) into nitrogen (N2) and iodine (I2). 2NI3 mc030-1.jpg N2 + 3I2 The molar mass of I2 is 253.80 g/mol, and the molar mass of NI3 is 394.71 g/mol. How many moles of I2 will form 3.58 g of NI3?
Solution 1

0.0135 moles of iodine will be formed.

Explanation:

Moles of nitrogen triiodide =

According to reaction 2 moles of nitrogen triiodide gives 3 moles of iodione gas.

Then 0.0090 mol of nitrogen triiodide will give:

0.0135 moles of iodine will be formed.

Solution 2
The molar mass of I2Â is 253.80 g/mol, and the molar mass of NI3Â is 394.71 g/mol. How many moles of I2Â will form 3.58 g of NI3?

0.0136Â
Question
What is the specific heat of a substance if 1560 cal are required to raise the temperature of a 312-g sample by 15Â°C? A) 0.033 cal/gÂ°c B) 0.33 cal/gÂ°c C) 0.99 cal/gÂ°c D) 1.33 cal/gÂ°c
Solution 1
The specific heat capacityÂ  the substance is calculatedÂ  usingÂ  the below formula

Q(heat) = Mc delta T
Q =1560Â  cal
m(mass) 312 g
delta T (change in temperature ) = 15 c
C= specific heat capacity=?

by making c the subject of the formulaÂ
c=Q/m delta T
= 1560Â  cal/ 312g x 15 c = 0.33 cal/g/c (answer B)

Question
Isomers have identical _________formulas; however, they have different ___________formulas. Empirical Molecular Structural
Solution 1

Isomers have identical Molecular formulas; however, they have different Structural formulas.

Explanation:

Hello,

In this case, it is widely known that isomers have identical molecular formulas and different structural formulas as shown for the compound having the following molecular formula:

In such a way, two feasible compounds could have the aforesaid molecular formula, which are dimethyl ether and ethanol respectively as shown below:

Best regards.

Solution 2
Molecular, structural.
Question
Define the term bond angle
Solution 1
Is the angle formed between three atoms across at least two bonds
Question
Identify the type of hybrid orbitals present and bond angles for a molecule with a tetrahedral shape
Solution 1

Answer: If molecular geometry is tetrahedral, there are four bond pairs of electrons and thus hybridization is

Explanation: Formula used

where, V = number of valence electrons present in central atom

N = number of monovalent atoms bonded to central atom

C = charge of cation

A = charge of anion

The number of electrons is 4 for tetrahedral shape that means the hybridization will be .

The electron pairs will try to minimize the repulsions and will occupy a position of maximum stability. This molecule is made up of 4 equally spaced hybrid orbitals forming bond angles of

Question
What is one role that lipids play in the body? AThey provide a quick source of energy for cells. B-They make up the contracting structures of muscles. C-They store coded information about heredity. D-They make up structural parts of cell membranes.
Solution 1
Lipids, also known as fats,Â playÂ many importantÂ rolesÂ in yourÂ body, from providing energy to producing hormones. You wouldn't be able to digest and absorb food properly withoutÂ lipids. I believe your answer is D.

Hope this helps!
Solution 2
D-They make up structural parts of cell membranes.
Question
Light striking a mirror at a 50Â° angle will be reflected at an angle _____.
Solution 1

Equal TO 50 degree because angle of incidence is equal to angle of reflection.

Solution 2

equal to 50 degress

Explanation:

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