Bohr's model of the atom attempts to explain the idea that:

A) protons and neutrons are found in the nucleus
B) all atoms of one type of element are identical
C) energy is quantized
D) the atom is mostly empty space

Answer:

C

Explanation:

The stem and leaves need sunlight to undergo photosynthesis, they will grow in such a way until they receive some sunlight.

Low pressure is one of the defining features of a hurricane. Therefore, the correct option is option C.

Hurricanes are intense tropical storms with spiralling winds, copious amounts of rain, and storm surges. These storms can pose a variety of issues when they hit land because they often occur over warm ocean waters close to the equator. Hurricanes leave a path of destruction in their wake, wrecking everything in their path from homes and infrastructure to creating severe flooding and landslides. The unpredictable nature of hurricanes is among their most worrisome features. Although modern technology and meteorological techniques have given us improved storm tracking and prediction systems, it is still challenging to correctly anticipate a hurricane's exact route and intensity.

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Answer: Are there options? I think the answer is continents, but I don't really understand the question. Is continents an option?

Explanation:

Answer:

1 mole of O₂ has more mass compared to 1 mole of Na

Explanation:

1 mole oxygen atom and 1 mole of Na atom has the same number of particles.

A mole of any substance has the Avogadro number of particles which is

6.02 x 10²³

Mass of a substance  = number of moles x molar mass

   Molar mass of O₂  = 2(16)  = 32g/mol

   Molar mass of Na = 23g/mol

Mass of O₂ = 1 x 32  = 32g

Mass of Na = 1 x 23 = 23g

So, 1 mole of O₂ has more mass compared to 1 mole of Na

Answer:B & C

tell me if im wrong

Answer:

Q 3 c it will reduce rate of photosynthesis in plants that live in the bottom of the lake

Q4 d the atom are in same group

This is right answer because these two elements are Lithium and neon Lithium is present in first group and Neon in last or group 18

Explanation:

Answer:

470.4N

Explanation:

Given parameters:

Mass of Stephanie  = 48kg

Unknown:

Force she exerts while falling to the ground  = ?

Solution:

The force she exerts is her weight;

  Weight  = mass x acceleration due to gravity

  Now insert the parameters ands solve ;

  Weight  = 48 x 9.8 = 470.4N

Answer:

B D

Explanation:

hope this is right but not entirely sure

Answer:

The unit for mass is the kilogram (Kg).

Explanation:

Hope this helped!! <3 good luckk!!

Answer:

Explanation:

1st convert given data into % per 100wt...

Total system mass = 63.0g + 5.90g = 68.9g

%Rb = 63.0g/68.9g x 100% = 91.4% per 100wt

%O  =  5.9g / 68.9g x 100% = 8.6%

Then follow the following sequence of calculations...

% => grams => moles => mole ratio => reduce to smallest whole no ratio => empirical ratio => empirical formula

%Rb = 91.4% => 91.4g/ 85.5g·mol⁻¹ =>1.069mole

%O  =   8.6% =>  8.6g/16g·mol⁻¹ => 0.5375mole

Rb:O => 1.069 : 0.5375

Reduce by dividing by the smaller mole value

1.069/0.5375 : 0.5375/0.5375 => 2 : 1 <=> empirical ratio

∴ Empirical Formula => Rb₂O

Answer:

SO4²

Explanation:

Formula and structure: The sulfate ion formula is SO42- and the molar mass is 96.06 g mol-1. This salt is formed by one sulfate center to which 4 atoms of oxygen are attached, 2 of these atoms are forming S=O.

Answer:

[tex]so _{4} ^{2 - } [/tex]

Explanation:

sulfate is consisting of sulfur element with 4 oxygen as the structure in the pic given and this group is 2- charged

THe correct answer is heat

Answer:

hi

Explanation:

heat

The molar mass of carbon (C) is 12.0107 u.

Answer:

Explanation:

The answer is 12.0107 u

Hope it helped you.

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Answer:

D. An ion with a +1 charge

Explanation:

The location of the lithium on the periodic table is in the first row, it is the third element. The type of ion that lithium form is  An ion with a +1 charge. The correct option is D.

Lithium is the third element of the periodic table. Its atomic number is three. It is white with a silvery touch. It is a metal that is highly reactive and flammable. The element, lithium, has the highest binding tendency with other elements.

Lithium contains 3 protons and 3 electrons. When it loses a proton, it contains two ions. It is a metal, so it will donate electrons, therefore it will contain 1 + charge.

Thus, the correct option is D. An ion with a +1 charge. Lithium is the third element and is located in the first row of the periodic table.

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Answer:

See explanation

Explanation:

You see, we must cast our minds back to Charles' law. Charles' law gives the relationship between the volume of a gas and temperature of the gas.

Now, Micheal left the balloon outside at a particular temperature and volume the previous night. Overnight, the temperature dropped significantly and so must the volume of the gas in the balloon!

Remember that Charles' law states that, the volume of a given mass of gas is directly proportional to its absolute temperature at constant pressure. Since the pressure was held constant, the drop in the volume of gas in the balloon can be accounted for by the drop in temperature overnight.

Answer: It means that the energy is being stored or preserved to be used at a later time.

Your question was a little vague, so if this isn't the answer you were looking for, just let me know and I'll fix it.

Hope this helps! Good luck! :D

The molecular formula of a compound gives the actual number of atoms of various elements present in one molecule of the compound. The molecular mass is 92 g/mol. The correct option is C.

The empirical formula of a compound can be defined as the formula which gives the simplest whole number ratio of atoms of various elements present in one molecule of the compound.

The molecular formula of a compound is a whole number multiple of its empirical formula.

Molecular formula = n × Empirical formula

The value of 'n' can be obtained from the relation:

n = Molecular mass / Empirical formula mass

Here the value of n = 2. Then,

Molecular mass = n × Empirical formula mass

Empirical formula mass of NO₂ = 45.8 g

2 × 45.8 = 91.6 ≈ 92 g/mol

Thus the correct option is C.

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Answer:

because the particles in solids are more close together and strong so they would support it better than fluid because fluid particles are spread out

Explanation:

Have A Wonderful Day !!

Due to properties of solid substances, they support objects easier than liquid.

Solids can support objects easier than fluids because in solid, particles are present on fix place as compared to liquid which is not fix and can move from one place to another. In Solid substances, particles are fix so they provides better support to the objects which are placed on them.

While on the other hand, in liquid substances particles are mobile so they are not considered better supporter for objects so we can conclude that due to properties of solid substances, they support objects easier than liquid.

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Answer:

hey :)

your answer is D.

Explanation:

To find density, you must divide mass and volume.

8 divided by 4 is 2

6 divided by 6 is 0

4 divided by 2 is 2

hope i helped any :))

The concentration of a solution : 13.3 g/dm³

Given

mass of solution = 2 g

volume = 150 cm³

Required

The concentration

Solution

The concentration of a substance can be expressed in several quantities such as moles, percent (%) weight/volume,), molarity, molality, parts per million (ppm) or mole fraction. The concentration shows the amount of solute in a unit of the amount of solvent.

Volume conversion : 150 cm³ = 0.15 dm³

the concentration : mass : volume = 2 g : 0.15 dm³ = 13.3 g/dm³

One mole of zinc contains 6.02 × 10²³ Zn atoms or formula units. Hence,6.53 moles of Zn contains 3.9  × 10²⁴ Zn atoms.

One mole of a substance is its amount containing 6.02 × 10²³  atoms or molecules. This number is called Avogadro number. One mole of every elements contains Avogadro number of atoms.

Similarly one mole of every compound contains 6.02 × 10²³  molecules. The mass of one mole of compound is called its molar mass.

Zn is 30th element in periodic table. Zn is a transition metal.  One mole of Zn  contains 6.02 × 10²³ Zn atoms . Hence number of atoms of 6.53 moles is:

6.53  × 6.02 × 10²³  = 3.9 × 10²³ .

Hence, there will be 3.9 × 10²⁴  Zn atoms in 6.53  moles.

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Answer:

 156.8kPa

Explanation:

The problem here is to convert mmHg to kPa;

We have been given:

            1176mmHg and the problem is to convert to kPa;

  1000Pa = 1kPa

               1 mmHg  =  133.322Pa

               1176mmHg will give  1176 x 133.322  = 156787.1Pa

To kPa;

             156.8kPa

Answer:

0.1139952 is the answer

Explanation:

Answer:

1.  

First of all, let's convert the energy of the absorbed photon into Joules:

The energy of the photon can be rewritten as:

where

h is the Planck constant

c is the speed of light

is the wavelength of the photon

Re-arranging the formula, we can solve to find the wavelength of the absorbed photon:

2. 1.24 eV

In this case, when the electron jumps from the n=4 level to the n=3 level, emits a photon with wavelength

So the energy of the emitted photon is given by the formula used previously:

and using

we find

converting into electronvolts,

Explanation:

Answer:

b.) burning paper

Explanation:

Answer:

sodium chloride + silver nitrate = silver chloride

Explanation:

i believe this is correct, hope it helps :)

Answer:

Krypton gain

strontium lose

xenon neither gain or lose