Bohr's model of the atom attempts to explain the idea that
the atom is mostly empty space
O all atoms of one type of element are identical
O energy is quantized
O protons and neutrons are found in the nucleus

Answer:

Mass = 917.4 g

Explanation:

Given data:

Number of molecules = 3.00 ×10²⁴ molecules

Mass in gram = ?

Solution:

1 mole contain 6.022 × 10²³ molecules

3.00 ×10²⁴ molecules × 1 mol /  6.022 × 10²³ molecules

0.5×10¹ mol

5 mol

Mass in gram:

Mass = number of moles  × molar mass

Mass = 5 mol  × 183.48 g/mol

Mass = 917.4 g

Answer:

B. Divergent

Explanation:

Rift valleys are usually formed at divergent margins where fractures in the earth's crust widens.

The fracture widens due the pulling apart of the plates that are involved.

Properly converted : 6 km = 6000000 mm

Given

Conversion of units

Required

Proper conversion

Solution

In converting units we must pay attention to the conversion factor between units

Let kg to g, then the conversion factor is 10³

1. L to mL = 10³

2000 L to ml = 2.10⁶ ml

wrong conversion

2. cm to mm = 10

5.25 cm = 52.5 mm

wrong conversion

3. mg to g = 10⁻³

35 mg = 35 x 10⁻³ g = 3.5 x 10⁻⁴ g

wrong conversion

4. km to mm = 10⁶

6 km = 6 x 10⁶ mm

proper conversion

Answer:

493.9°C

Explanation:

Given parameters:

Initial pressure  =0.815atm

Initial temperature  = 265C  = 265 + 273  = 538k

Initial volume  = 416mL  = 0.416L

New volume    = 593mL  = 0.593L

Unknown:

New temperature =?

Solution:

Since we are dealing with constant pressure condition, we apply charles's law.

It states that the volume of a fixed mass of gas varies directly as its absolute temperature if the pressure is constant.

    Mathematically ;

         [tex]\frac{V1}{T1}[/tex]    = [tex]\frac{V2}{T2}[/tex]  

V1 is the initial volume                     V2 is the new volume

T1 is the initial temperature             T2 is the new temperature

   [tex]\frac{0.416}{538}[/tex]   = [tex]\frac{0.593}{T2}[/tex]    

           T2 = 766.9K;

  In °C  = 766.9 - 273 = 493.9°C

Answer:

she should add salt to the mixture

Explanation:

salt is easily able to dissolve

The velocity after 5 second =19 m/s

Given

Initial velocity =vi = 12 km/h=3.3 m/s

Time=t = 5 s

Acceleration=a = 2 m/s²

Required

Final velocity, vf

Solution

Motion with constant acceleration

Can be formulated :

vf=vi+at

Input the value :

vf=3.3+2.5

vf=9+10

vf=19 m/s

Answer:

A. Chromosome

Explanation:

Chromosomes carry the genetic info, and the nucleus stores it.

Hope this helps :D

Answer: a

Explanation:

In a couplet one statement is agreeing and one is rejecting. Therefore, option A is correct.

A couplet is two lines of poetry that follow each other, particularly two lines that rhyme and are the same length.

Heroic couplets are similar to elegiac couplets. Heroic couplets are also usually closed and have their own meaning. They are frequently used in English epics and narrative poems.

A couplet is a unit of two lines of poetry that use the same or similar meter, rhyme, or are separated from other lines by a double line break. Here are some more important facts about Couplets are not required to be separate stanzas.

Thus, option A is correct.

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2.0 mol O₂

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

[RxN - Balanced]   CH₄ + 2O₂ → CO₂ + 2H₂O

[Given]   36 g H₂O

Step 2: Identify Conversions

[RxN] 2 mol H₂O → 2 mol O₂

Molar Mass of H - 1.01 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of H₂O - 18.02 g/mol

Step 3: Stoichiometry

Step 4: Check

Follow sig fig rules and round. We are given 2 sig figs.

1.99778 mol O₂ ≈ 2.0 mol O₂

Answer:

p4

Explanation:

Answer:

20%

Explanation:

10.0 = 100%

8.00 = 80%

100-80= 20

Answer:

b

Explanation:

The empirical formula :

MgCl₂

Li₂O

Given

a 3.60 g of magnesium and 10.65 g of chlorine

b 9.1 g of lithium and 10.4 g of oxygen

Required

The empirical formula

Solution

The empirical formula is the smallest comparison of atoms of compound forming elements.

A molecular formula is a formula that shows the number of atomic elements that make up a compound.

(empirical formula) n = molecular formula

a. mol ratio of Mg (Ar=24 g/mol) and Cl(Ar=35.5 g/mol)

Mg : Cl

=3.6/24 : 10.65/35.5

=0.15 : 0.3 = divide by 0.15

=1 : 2

The empirical formula : MgCl₂

b. a. mol ratio of Li (Ar=7 g/mol) and O(Ar=16 g/mol)

Li : O

=9.1/7 : 10.4/16

=1.3 : 0.65 = divide by 0.65

= 2 : 1

The empirical formula : Li₂O

The percent composition of Uranium in U308 = C. 81.03%

Given

X g of U

3.795 g of O

20.00 g of  U308

Required

The percent composition of Uranium

Solution

mass of Uranium in U308 :

= mass of U308 - mass of O

= 20 g - 3.795 g

= 16.205 g

The percent composition :

[tex]\tt \%U=\dfrac{mass~U}{mass~U308}\times 100\%[/tex]

%U = (mass U/mass U308) x 100%

%U= (16.205/20) x 100%

%U = 81.025≈81.03

Answer:mass

Explanation:

Answer:

weight is the measure of the force of gravity pulling on the object. mass is the measure of the object's matter.

Answer:

Tyra can make 53 batches

Explanation:

Given

[tex]Batches = \frac{1223}{r}[/tex]

Required

Find the number of batches when r = 23

To do this, we simply substitute 23 for r in [tex]Batches = \frac{1223}{r}[/tex]

So, we have:

[tex]Batches = \frac{1223}{23}[/tex]

[tex]Batches = 53.17[/tex]

Approximate:

[tex]Batches = 53[/tex]

Answer:

False, the empirical formula denotes the smallest whole-number ratio of atoms in a compound

Explanation:

a molecular formula is the total number of atoms in the compound

Answer:

i think its a

Explanation:

Answer:

Ununennium.

Explanation:

Ununennium, also known as eka-francium or element 119, is the hypothetical chemical element with symbol Uue and atomic number 119. It's Mass number is [315] (predicted), as we as it is existing on the periodic table hence its symbol: Uue

Answer B

Explanation:

hereI wpould put it on t

Answer:

In both natural and built systems, stability and change are an important focus of study for both scientists and engineers. Stability refers to a system that is unchanging. ... A dynamic equilibrium exists when chemical reactions or physical movements occur at rates that balance out, creating no net change in a system.

Answer:

In both natural and built systems, stability and change are an important focus of study for both scientists and engineers. Stability refers to a system that is unchanging. ... A dynamic equilibrium exists when chemical reactions or physical movements occur at rates that balance out, creating no net change in a system.

Explanation:

Answer:

A: A substance that can be separated into two or more substances only by chemical means.

Explanation:

The best answer for this would be A. A compound in general is when two or more elements are bonded chemically. That is, the elements are joined in a chemical reaction. An example of a compound is table salt; (sodium chloride) NaCl. It, like all chemicals, can be separated into both of its components, so B is out. The other two answers basically say is it either only chemical or physical means that can separate it, when the answer is that it is only chemical changes that can separate a compound. There can be a reaction when a compound is broken up. You might think that you can separate salt crystals with a hammer or some physical force, but that's only the salt lattice, not the Na and Cl coming apart. Also, for the compound water, H2O, the Hydrogen and Oxygen can be separated by running an electric current through the water sample. This chemically alters the water molecule and splits it up, which is a chemical change. So, to sum up here, you can only use chemical means to separate a compound. Take care!

A compound is a substance that can be separated into two or more of its constituents by chemical methods. So the correct option is A.

Any material made up of similar molecules with atoms from two or more different chemical elements is referred to as a chemical compound.

Atoms from more than 100 distinct chemical elements, both in their pure forms and when mixed to create chemical compounds, make up all matter in the universe. A sample of a pure element has just the atoms that are distinctive of that element, and each element's atoms are distinct.

For instance, the atoms that make up carbon differ from those that make up iron, which differs from those that makeup gold. Every element has a distinct symbol that is made up of one, two, or three letters that come from either the element's current name or its original name.

Therefore the correct option is A.

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Boyle's law states that the pressure of the given quantity inversely varies with its volume at a constant temperature.

Answer:

Principia

Explanation:

Answer:

pH is a measure of how acidic/basic water is. The range goes from 0 to 14, with 7 being neutral.

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] 2 mol AlF₃ = 6 mol KF

Molar Mass of Al - 26.98 g/mol

Molar Mass of F - 19.00 g/mol

Molar Mass of K - 39.10 g/mol

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

Molar Mass of KF - 39.10 + 19.00 = 58.10 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

Answer:

7.4798

Explanation:

i just did the quiz, the guy above me is wrong.

Answer: Selective breeding?

Explanation:

A farmer has bred his pineapple plants from the sweetest pineapples from his last harvest to get even sweeter pineapple plants. This is an example of selective breeding.

By determining which male and female animals or plants will normally reproduce sexually and generate offspring together, people can employ animal and plant breeding to selectively acquire specific phenotypic features.

But excessive selective breeding can result in the emergence of hereditary diseases. And in fact, many dog breeds today experience major health problems as a result of their excessive physical characteristics. Health issues known as genetic illnesses are brought on by "flaws" in a person's genome.

Through artificial selection, several fruits and vegetables have been enhanced or even created. Selective breeding was very useful in creating broccoli, cauliflower, and cabbage from the wild mustard plant.

Thus, This is an example of selective breeding.

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Answer:

The girl is 300N as she is staying still, and not buried in the ground or flying, hence, it has to be the same as the force pushing down. Sorry, can't answer about the rocket one.

Explanation:

Answer:

[tex]1)kidneys \\ 2)excretory \\ \: \: 3)valve \\ \: 4)reproductive \\ \: 5)circulatory \\ \: 6)circulatory \\\ \: 7)trachea \\ \\ \\ plzz \: mark \: as \: brainliest[/tex]

Answer:

it runs the risk of triggering earthquakes. releases harmful gases