HELP ME PLEASE. I DONT HAVE MUCH TIME LEFT!


Select the correct answer. Which molecule has polar bonding and is nonpolar? OA H₂O OB. BF3 OC. NH3 OD. NC13 O E. CH₂Cl2​

Answer:

I think it will 25 this is the answer of this qn

neutrons : atomic mass - atomic number so

53-25

28 is the answer

Explanation:

The main functions of the cell wall are to provide structure, support, and protection for the cell. The cell wall in plants is composed mainly of cellulose and contains three layers in many plants. The three layers are the middle lamella, primary cell wall, and secondary cell wall

Answer:

The cell wall is an outer protective membrane in many cells including plants, fungi, algae, and bacteria. ... The main functions of the cell wall are to provide structure, support, and protection for the cell. The cell wall in plants is composed mainly of cellulose and contains three layers in many plants.

Explanation:

The new pressure would be = 4.46 atm

Given

V₁=6.7 L(at STP, 1 atm 273 K)

V₂=1.5 L

Required

The new pressure

Solution

Boyle's Law  

At a constant temperature, the gas volume is inversely proportional to the pressure applied  

[tex]\rm p_1V_1=p_2.V_2\\\\\dfrac{p_1}{p_2}=\dfrac{V_2}{V_1}[/tex]

P₂ = (P₁V₁)/V₂

P₂ = (1 atm x 6.7 L)/1.5 L

P₂ = 4.46 atm

Answer:

when a substance is heated it gains thermal energy. Therefore its particles move faster and its temperature rises. when a substance is cool it loses thermal energy which causes its particles to move more slowly and its temperature to drop

A substance gains thermal energy when it is heated. As a result, its temperature increases, and its particle motion accelerates.

Thermal energy is the heat energy that is given to a substance when its temperature is increased.

As we know, all matter are made up of atoms, and atoms are made up of charged particles. These particles become random or come in motion when they get thermal energy or heat.

When substances get thermal energy or heat energy. They become active, and the particles move apart from each other.

So, due to thermal energy, the atoms become loose, and the substance loses its shape, the temperature decrease the atoms come closer to each other.

Thus, when a substance cools, thermal energy is lost, which slows down the movement of its particles and lowers the substance's temperature and vice versa.

To learn more about thermal energy, refer to the link:

https://brainly.com/question/11278589

#SPJ2

Answer:

453.6/58/2=453.6/2.9=156.314 grains

The number of grains in a 453.6 g (1lb.) bag of rice is equal to 157 grains of rice.

The weight can be described as the force acting due to gravity. Weight can be considered as a vector quantity if the gravitational pull is acting on the body.

Therefore, in free fall, the weight of the object would be zero. Therefore, terrestrial objects can be weightless while ignoring air resistance.

The unit for measurement of weight is the same as of force, which is the newton. A body with a mass of 1 kilogram will exhibit a weight of about 9.8 Newton on the surface of the Earth, and about 1/6th as much weight on the Moon.

Given the weight of the 20 grains = 58 g

The weight of one grain = 58/20 = 2.9 g

The number of grains (n) of rice in weight 453.6 g of the bag of rice  can be calculated as:

n = 453.6/2.9

n = 156.4 ≈ 157

Therefore, the number of grains can be considered equal to 157 grains of rice.

Learn more about weight, here:

brainly.com/question/13040516

#SPJ2

Answer:

During the process of photosynthesis, cells use carbon dioxide and energy from the Sun to make sugar molecules and oxygen. Then, via respiration processes, cells use oxygen and glucose to synthesize energy-rich carrier molecules, such as ATP, and carbon dioxide is produced as a waste product

Answer:

the metallic objects not sticking to a magnet

Answer:

Mass = 63.19 g

Explanation:

Given data:

Number of moles of Cl₂ = 0.89 mol

Mass in gram = ?

Solution:

Formula:

Mass = number of moles × molar mass

Molar mass of Cl₂ = 71 g/mol

by putting values,

Mass = 0.89 mol × 71 g/mol

Mass = 63.19 g

Answer:

This informative text, written in easily understood language, will allow those without a mechanical engineering background to understand air calculation and ventilation problems.

The average speed of the family : 70 km/h

Given

time = 2 hour

distance = 140 km

Required

The average speed

Solution

Distance is the length traveled by an object within a certain time  

Average speed = total distance/total amount of time

Can be formulated :

 Avg speed = d : t

Total distance traveled : 140 km

Total time : 2 hr

Avg speed = 140 : 2 = 70 km/h

Answer:

d

Explanation:

Answer: B. Mass number minus atomic number

Explanation: The atomic # is equal to the # of protons. The mass number is the total mass of neutrons & protons. You subtract the protons (atomic number) from the mass of the atom, the formula would be as shown:

Mass - Protons = Neutrons

An example is shown below

Element: Tin

Name shown on periodic table: Sn

Atomic #: 50

Mass # 118.711

118.711 - 50 = 68.711    <--- answer

Mass^     ^Protons/ Atomic #

I hope this helps :)

Answer:

g) 400 (h) 1331 (i) 11 (j) 20 (k) 13 (l) 15 ... (e) 1 , 2, 3, 6, 9, 18 (f) 1, 5, 25 (g) 1, 2, 4, 5, 8, 10, 20, 40. (h) 1, 2 ... 19. 70 x. (h) x. 6. (i). 9. 8 x. (j). 27. 24 x. (k). 5. 4. 20 a b. +. (l). 8. 3. 24 x y. +. (m).

Answer:

Mg: 52.9%

Br: 47.1%

Explanation:

Answer:

Likely the reason behind carrying them in liquid for is to condense them. liquid takes up far less space than gases do and will last far longer. they can be transformed back into gases through heating them back up. To keep them solid would require frigid temperatures but liquid will transfer more easily through space.

Answer:

(H2O) and (O2) ??

Explanation:

I hope it helps...

Answer: iceberg

Explanation: im pretty sure

Answer:

In space (Trust me)

Answer:

Explanation:

Joule is the unit of energy and work done.

It is a derived quantity because it is not a fundamental or basic unit.

A derived unit is formed by the combination of two or more fundamental quantities.

Since work done  = Force x distance

                           Force  = mass x acceleration

                          = mass x acceleration x distance

The unit then becomes kgm²/s²

So, 1joule  = 1kgm²/s²

Answer:

the answer is C

Explanation:

Explanation is C

Answer: the answer above is wrong, the correct answer is: Did continental drift cause the extinction of the megalodon

Explanation:

Answer:

To make proteins....

It is used to make amino acids in our body which in turn make proteins.

Explanation:

hope it was helpful.....

Answer:

the answer is C

Explanation:

Answer:C B

Explanation:

Answer:

Thermal heating and cooling

Explanation:

This process described results from thermal heating and cooling as a mechanism of mechanical weathering of rock bodies.

Answer: 9.656332386078939e-21

Explanation:

The SI base unit for amount of substance is the mole. 1 grams H2O is equal to 0.055508435061792 mole. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between grams H2O and mole. Type in your own numbers in the form to convert the units

7.4797 g AlF₃

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Stoichiometry

Step 1: Define

[RxN] 2AlF₃ + 3K₂O → 6KF + Al₂O₃

[Given] 15.524 g KF

Step 2: Identify Conversions

[RxN] 6 mol KF = 2 mol AlF₃

Molar Mass of K - 39.10 g/mol

Molar Mass of F - 19.00 g/mol

Molar Mass of Al - 26.98 g/mol

Molar Mass of KF - 39.10 + 19.00 = 58.1 g/mol

Molar Mass of AlF₃ - 26.98 + 3(19.00) = 83.98 g/mol

Step 3: Stoichiometry

Step 4: Check

Follow sig fig rules and round. We are given 5 sig figs.

7.47966 g AlF₃ ≈ 7.4797 g AlF₃