admin

Chemistry High School

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.
___________________

📚 Related Questions

Question

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)
With the values put in: 0.35 x 45 = 0.35 x V(NaOH)
= 45 ml.
There is 45 ml of V(NaOH)

Let me know if you need anything else. :)

- 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.

Let me know if you need anything else.

- 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

Answer:

0.0135 moles of iodine will be formed.

Explanation:

$2NI_3\rightarrow N_2+3I_2$

Moles of nitrogen triiodide = $\frac{3.58 g}{394.71 g/mol}=0.0090 mol$

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

Then 0.0090 mol of nitrogen triiodide will give:

$\frac{3}{2}\times 0.0090 mol=0.0135 mol$

0.0135 moles of iodine will be formed.

Solution 2

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?

0.0136

Question

What is the specific heat of a substance if 1560 cal are required to raise the temperature of a 312-g sample by 15°C? A) 0.033 cal/g°c B) 0.33 cal/g°c C) 0.99 cal/g°c D) 1.33 cal/g°c

Solution 1

The specific heat capacity the substance is calculated using the below formula

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

by making c the subject of the formula
c=Q/m delta T
= 1560 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

Answer:

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:

$C_2H_6O$

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

$CH_3-O-CH_3\\CH_3-CH_2-OH$

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 $sp_3$

Explanation: Formula used

$:{\text{Number of electrons}} =\frac{1}{2}[V+N-C+A]$

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 $sp^3$ .

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 $sp^3$ hybrid orbitals forming bond angles of $109.5^0$

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, play many important roles in your body, from providing energy to producing hormones. You wouldn't be able to digest and absorb food properly without 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 50° 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

Answer:

equal to 50 degress

Explanation:

📂 Subjects

Mathematics 2647929

History 842281

English 748681

Biology 586256

Social Studies 406852

Chemistry 368373

Business 348603

Physics 324927

Health 199835

Spanish 130075

Geography 112100

Computers and Technology 106146

Arts 77164

Advanced Placement (AP) 23675

World Languages 23213

French 22589

Engineering 19607

Law 17108

Medicine 13966

SAT 10987

German 3389

🔢 Grades

High School 3423409

Middle School 2092250

College 1518097