how does the earth give us what we call and night

Answer:

The pair of arrows which represents the relationship of speeds of the two cars is;

The second option as shown in the attached drawing

Explanation:

The given parameters are;

The reading on the speedometer of one car = 20 m/s

The reading on the speedometer of the other car = 72 km/h = 20 m/s

The blue arrow = 20 m/s

Therefore, given that the speeds of both cars are equal (20 m/s = 72 km/h = 20 m/s),  the pair of arrows that represent the relationship of speeds of the two cars is two equal length blue arrows which is the second option

The attached diagram showing the pair of arrows that represents the relationship of speeds of the two cars is drawn using Microsoft Visio.

Answer:

Van der Waals forces is defined as the force that include attraction and repulsions between atoms or molecules, and also involve intermolecular forces

Vander Waals force formed between the similar molecules and not different molecules, that means Van der Waals force  exist between two water molecules and not between hydrogen and oxygen of one molecule. Hydrogen and oxygen are connected with covalent bonds.

Answer:hope this help

Explanation:

Answer:

2

Explanation:

All living organisms falls to either of the prokaryote or eukaryote categories. Thus, the correct option is true.

Living organisms are classified into 2 based on the type of cells they are made of. These are:

Hence, it is safe to say that prokaryotes and eukaryotes both fall in the category of living things. You have to be living in order to be classified as either.

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The correct option which shows the relation between particles of the three substances is 1 mole of aluminum = 1 mole of helium = 1 mole of water.

A particle is a small part of matter.

The term refers to particles of all sizes, ranging from subatomic particles like electrons to visible particles like dust particles floating in sunlight.

The relationship of a number of particles of the substance can be calculated by Avogadro's law

Thus, the correct option is B. 1 mole of aluminum = 1 mole of helium = 1 mole of water

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Answer:

4.43 g

Explanation:

The reaction between sodium chloride and flourine gas is given as;

NaCl + F2 --> NaF + Cl2

From the stochiometry of the equation;

1 mol of NaCl reacts eith 1 mol of F2 to form 1 mol of NaF and Cl2

Mass of 1 mol of F2 = 38g

Mass of 1 mol of sodium flouride, NaF = 42g

This means 38g of flourine reacted with NaCl to form 42g of NaF

xg of F2 would form 4.9g of NaF

38 = 42

x = 4.9

x = 4.9 * 38 / 42

x = 4.43 g

Answer: The pressure of the gas is 0.34 atm

Explanation:

According to ideal gas equation:

[tex]PV=nRT[/tex]

P = pressure of gas = ?

V = Volume of gas = 605 ml = 0.605 L      (1L=1000ml)

n = number of moles  = 0.00803

R = gas constant =[tex]0.0821Latm/Kmol[/tex]

T =temperature =[tex]39^0C=(39+273)K=312K[/tex]

[tex]P=\frac{nRT}{V}[/tex]

[tex]P=\frac{0.00803\times 0.0821 L atm/K mol\times 312K}{0.605L}=0.34atm[/tex]

The pressure of the gas is 0.34 atm

Answer:

1.5 moles of sodium chloride are present.

Explanation:

Given data:

Number of moles of sodium chloride = ?

Number of atoms of sodium chloride = 9.07×10²³

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

9.07×10²³ atoms  × 1 mol / 6.022 × 10²³ atoms

1.5 moles of sodium chloride are present.

Answer:

B  29 protons, 27 electrons

Explanation:

The given specie is copper ion:

         Cu²⁺  

We are to find the number of protons and electrons it contains.

 The number of protons is the positively charged particles in the atom.

 Electrons are the negatively charged particles in the atom.

The number of protons is the same as the atomic number

Atomic number of copper  = 29

 Number of protons  = 29

 Now;

    Charge  = Number of protons  - Number of electrons

     2  = 29  - number of electrons

     -27  = - number of electrons

 Number of electrons  = 27

a. double replacement

b. AB + CD ⇒ AD +CB

c and d

H₃PO₄ : Phosphoric acid

KOH : Potassium hydroxide

K₃PO₄ : Tripotassium phosphate

H₂O : water

Given

Reaction

H₃PO₄ + 3 KOH → K₃PO₄ + 3 H₂O

Required

Type of reaction

General equation

Name of reactants and product

Solution

Double replacement reaction : Cations and anions of different compounds switch places

It can also be said as a neutralization reaction because it produces water(reaction between an acid and a base)

AB + CD ⇒ AD +CB

H₃PO₄ : Phosphoric acid

KOH : Potassium hydroxide

K₃PO₄ : Tripotassium phosphate

H₂O : water

Explanation:

Different heating process affect the microstructure of the steel in different ways. Thus, imparting different properties to the steel. For example, annealing is done is done to impart softness to steel, hardening is done to hardened the steel( eg: carburizing, nitriding, cyaniding) whereas tempering is done to improve the ductility of the steel.

Steel mainly contains iron and carbon. This percentage of carbon and iron decides the property of the steel. It is the % of carbon which is altered in different heating process that to obtained the desire microstructure in steel.

Answer:

10Rb° + 2RbNO₃  =>  6Rb₂O + N₂

Explanation:

Given:   Rb° + RbNO₃ => Rb₂O + N₂

=> 1st balance rubidium in RbNO₃ against Rb₂O  by inserting a '2' coefficient before RbNO₃ and a '6' coefficient  before Rb₂O

=> Rb° + 2RbNO₃  =>  6Rb₂O + N₂   => Oxygen and Nitrogen are balanced. All that remains is balancing Rb by inserting a '10' coefficient.

=>  10Rb° + 2RbNO₃  =>  6Rb₂O + N₂

Note: In balancing chemical equations, saving an element that is not part of a compound until last frequently gives balance by inspecting the number of elements of the specific kind and boosting its coefficient to balance the equation.  

Balanced equation =>  10Rb° + 2RbNO₃  =>  6Rb₂O + N₂

The balanced chemical reaction can be of the equation given is [tex]2Rb + RbNO_3 - > Rb_2O + N_2[/tex].

We need to make sure that the amount of atoms of each element is the same on both sides of the equation in order to balance the chemical equation [tex]Rb + RbNO_3- > Rb_2O + N_2[/tex].

By counting the atoms in each element, we may begin to balance the equation. We have one Rb, one Rb, one N, and three O atoms on the left side. We have two Rb, one N, and two O atoms on the right side.

We can add a coefficient of 2 in front of [tex]RbNO_3[/tex] to balance the Rb atoms, which gives us:

[tex]2Rb + RbNO_3 - > Rb_2O + N_2[/tex]

Thus, now, the equation is balanced with two Rb atoms on both sides.

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Answer:

58.3%

Explanation:

The formula of the compound is given as:

     CsPO₄  

Now, the percentage composition of Cs in the compound is = ?

So;

To find this parameter, find the molar mass of the compound:

  Molar mass of  CsPO₄   = 132.9 + 31 + 4(16)  = 227.9g/mol

Percentage composition of Cs= [tex]\frac{132.9}{227.9} x 100[/tex]   = 58.3%

Answer:

Di Sulphur tetraiodide is the chemical compound with the formula S2I4

Explanation:

Answer:

A. Rutherford's discovery that atoms contain a nucleus

Explanation:

Answer:

A is the answer

Explanation:

Answer:

0.55g/L

Explanation:

Given parameters;

Mass of salt  = 55g

Volume of water  = 100L

Unknown:

g/L concentration  = ?

Solution:

To solve this problem, we must understand that concentration is the amount of solute per solution

 g/L concentration  = [tex]\frac{55}{100}[/tex]   = 0.55g/L

Answer:

1.08 x 10²⁵molecules

Explanation:

From the mole concept we know that ;

      1 mole of any substance contains 6.02 x 10²³ molecules

This number is the Avogadro's number.

 So;

  18 mole of CH will contain:

       Number of molecules of CH  = 18 x 6.02 x 10²³ = 1.08 x 10²⁵molecules

The number of molecules is therefore 1.08 x 10²⁵molecules

Answer: The atom count for each element on the reactant side of a balanced chemical equation is equal to the atom count for each element on the product side of the same equation

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products formed must be equal to the mass of reactants taken.

In order to get the same mass on both sides, the atoms of each element must be balanced on both sides of the chemical equation.

[tex]2H_2+O_2\rightarrow 2H_2O[/tex]

Thus there are 4 atoms of hydrogen on reactant as well as product side.

Also there are 2 atoms of oxygen on reactant as well as product side.

Answer:

gas

Explanation:

its either gas or plasma but gas should be it bc liquid and solid are cold

Answer:

Examples of EM waves are radio waves, microwaves, infrared waves, X-rays, gamma rays, etc.

Answer:

Electromagnetic waves can be split into a range of frequencies. This is known as the electromagnetic spectrum. Examples of EM waves are radio waves, microwaves, infrared waves, X-rays, gamma rays, etc.

Explanation:

Answer:

B its most likely sorry if im wrong :D :(

Explanation:

Answer:

B

Explanation:

thermal energy is the energy between one object to another

Answer:

Gravitational potential energy: [tex]GPE_{B}>GPE_{A}>GPE_{C}[/tex]

Kinetic energy: [tex]KE_{B}<KE_{A}<KE_{C}[/tex]

Total mechanical energy: [tex]ME_{A}=ME_{B}=ME_{C}[/tex]

Explanation:

The gravitational potential energy is directly proportional to height ([tex]GPE_{B}>GPE_{A}>GPE_{C}[/tex]). Since there are no non-conservative forces, the total mechanical energy is conserved ([tex]ME_{A}=ME_{B}=ME_{C}[/tex]) and the total mechanical energy is the sum of gravitational potential and kinetic energies. Then:

[tex]GPE_{A} + KE_{A} = GPE_{B} + KE_{B} = GPE_{C} + KE_{C}[/tex] (1)

If we know that [tex]GPE_{B}>GPE_{A}>GPE_{C}[/tex], then we conclude the following inequation for the kinetic energy:

[tex]KE_{B}<KE_{A}<KE_{C}[/tex] (2)

Answer:

Explanation:

Sodium bicarbonate,

NaHCO

3

, will decompose to form sodium carbonate,

Na

2

CO

3

, water, and carbon dioxide,

CO

2

2

NaHCO

3(s]

→

Na

2

CO

3(s]

+

CO

2(g]

+

H

2

O

(g]

Notice that you have a

2

:

1

mole ratio between sodium bicarbonate and sodium carbonate. This means that the reaction will produce half as many moles of the latter than whatever number of moles of the former underwent decomposition.

Use sodium carbonate's molar amss to determine how many moles you'd get in that sample

0.685

g

⋅

1 mole NaHCO

3

84.007

g

=

0.008154 moles NaHCO

3

Now, if the reaction were to have a

100

%

yield, it would produce

0.008154

moles NaHCO

3

⋅

1 mole Na

2

CO

3

2

moles NaHCO

3

=

0.004077 moles Na

2

CO

3

Use the molar mass of sodium carbonate to determine how many grams would contain this many moles

0.004077

moles

⋅

105.99 g

1

mole

=

0.4321 g Na

2

CO

3Sodium bicarbonate,

NaHCO

3

, will decompose to form sodium carbonate,

Na

2

CO

3

, water, and carbon dioxide,

CO

2

2

NaHCO

3(s]

→

Na

2

CO

3(s]

+

CO

2(g]

+

H

2

O

(g]

Notice that you have a

2

:

1

mole ratio between sodium bicarbonate and sodium carbonate. This means that the reaction will produce half as many moles of the latter than whatever number of moles of the former underwent decomposition.

Use sodium carbonate's molar amss to determine how many moles you'd get in that sample

0.685

g

⋅

1 mole NaHCO

3

84.007

g

=

0.008154 moles NaHCO

3

Now, if the reaction were to have a

100

%

yield, it would produce

0.008154

moles NaHCO

3

⋅

1 mole Na

2

CO

3

2

moles NaHCO

3

=

0.004077 moles Na

2

CO

3

Use the molar mass of sodium carbonate to determine how many grams would contain this many moles

0.004077

moles

⋅

105.99 g

1

mole

=

0.4321 g Na

2

CO

3

By using the given data, the percent yield for sodium carbonate (Na₂CO₃) is equal to 127.

Percent yield of any data can be calculated as:

% yield = (Actual value / Theoretical value) × 100

In the question actual yield of sodium carbonate is given, which is equal to 2.04 grams. And in the table theoretical yield of sodium carbonate also given, which is equal to 1.60 grams.

Now putting these value in the above equation, we get:

% yield = (2.04 / 1.60) × 100 = 127

Hence, percent yield of sodium carbonate (Na₂CO₃) is 127.

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Answer: Different parts of the sun rotate at different rates.

Explanation:

The statement that best describes the motion of the sun is that different parts of the sun rotate at different rates.

First and foremost, we should note that the rotation of the sun is on its axis and also the sun isn't a solid. Due to this, its motion will be that there'll be rotation of different part of it at different rates. Assuming the sun was solid, then all of its parts will move together.

Answer:

Different parts of the sun rotate at different rates.

Explanation: pic proof

Answer:

How to Draw a Lewis Structure.

Step 1: Find the Total Number of Valence Electrons.

Step 2: Find the Number of Electrons Needed to Make the Atoms "Happy".

Step 3: Determine the Number of Bonds in the Molecule.

Step 4: Choose a Central Atom.

Step 5: Draw a Skeletal Structure.

Step 6: Place Electrons Around Outside Atoms.

Explanation:

Hope this helped! :)