please help asap !! i don’t know if that’s the right answer

Answer:

Electron dot diagram is attached below

Explanation:

Sodium is alkali metal and present in group one. It has one valence electron. All alkali metal form salt when react with halogens.

Sodium loses its one electron to get stable.  While all halogens have seven valence electrons they need only one electron to get stable electronic configuration.

When alkali metals such as sodium react with halogen fluorine it loses its one valence electron which is accepted by fluorine and ionic bond is formed. The compound formed is called sodium fluoride.

Na + F   →   NaF

In cross and dot diagram electrons of one atom are shown as dots while other atom shown as cross to distinguish.

Electron dot diagram is attached below.

Answer:

Explanation:

energy for photon is calculated in same wasy as for electromagnetic radiation

energy for electromagnetic radiation = hf

where f is the frequency of photon

h is Planck's constant = h = 4.14 × 10−15 eV · s.

thus

energy of photon = 4.14 × 10−15 eV · s *  2.36 x 10-19 Hz

energy of photon = 9.77 * 10−(-15+ -19) eV

energy of photon = 9.77 * 10−34eV        answer

Answer:

some zoom in farther

Explanation:

some microscopes zoom in farther than others so we can see even smaller things

Answer:

I think solids

Explanation:

sorry if its not right

a) lithium

Execution:

First, a magnesia stick is dipped in hydrochloric acid and then in lithium chloride. The stick is then held in the burner flame.

Observation:

The flame turns carmine.

b) ammonium ion

Execution:

Some ammonium sulfate is placed in a small vessel. A strip of indicator paper is moistened and stuck to the inside of a watch glass case. Then a few drops of hydrochloric acid are added to the ammonium sulfate and the watch glass bowl is held over the vapors that develop.

Observation:

The indicator paper turns blue because gaseous ammonia is produced, which reacts with the water in the indicator paper to form a base.

c) sulfate ions

Execution:

The ammonium sulfate is dissolved in water and treated with barium chloride solution.

Observation:

A white, poorly soluble precipitate of barium sulfate is formed.

d) presence of water

Execution:

Anhydrous copper sulfate, which is white, is added to the substance to be tested.

Observation:

In the presence of water, the salt turns light blue.

e) carbonate ions

Execution:

A few drops of hydrochloric acid are placed on the solid calcium carbonate.

Observation:

A gas evolution can be observed, during which carbon dioxide is produced.

f) iodide ions

Execution:

A potassium iodide solution is mixed with silver nitrate solution.

Observation:

A yellow precipitate of silver iodide is formed.

Answer:

I think it is synthesis

Answer:

The answer is Synthesis

Explanation:

The two objects combine to make a bigger object

Answer:

V = 34.55 L

Explanation:

Given that,

No of moles, n = 1.4

Temperature, T = 20°C = 20 + 273 = 293 K

Pressure, P = 0.974 atm

We need to find the volume of the gas. It can be calculated using Ideal gas equation which is :

PV=nRT

R is gas constant, [tex]R=0.08206\ L-atm/mol-K[/tex]

Finding for V,

[tex]V=\dfrac{nRT}{P}\\\\V=\dfrac{1.4\times 0.08206\times 293}{0.974 }\\\\V=34.55\ L[/tex]

So, the volume of the gas is 34.55 L.

Answer: the oxidation of the copper (it turning green)

Explanation:

Answer:

A compound of nickel and chloride in which the ratio of nickel (in the +2 oxidation state) to chloride is 1:2. Stars

Explanation:

Answer:

The heat required to raise the temperature of 12g of water from 16 C to 21 C is 60 cal.

Explanation:

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

There is a direct proportional relationship between heat and temperature. The constant of proportionality depends on the substance that constitutes the body as on its mass, and is the product of the specific heat by the mass of the body. So, the equation that allows calculating heat exchanges is:

Q = c * m * ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case, you know:

Replacing:

Q= 4.186 [tex]\frac{J}{g*C}[/tex] *12 g *5 °C

Solving:

Q=251.16 J

Since 1 J is equal to 0.2388 cal, then the following rule of three can be applied: if 1 J is equal to 0.2388 cal, then 251.16 J to how many cal are?

[tex]cal=\frac{251.16 J * 0.2388 cal}{1 J}[/tex]

cal= 59.98 ≅ 60

The heat required to raise the temperature of 12g of water from 16 C to 21 C is 60 cal.

The calorimeter measures the transferred heat of the system. 60 cal is heat is required to raise the temperature of water from 16 to 21 degrees celsius.

Heat is the product of the mass, specific heat, and the change in the temperature of the system.

Heat exchanged by the system is calculated as:

[tex]\rm Q = \rm m c \Delta T[/tex]

Where,

Mass (m) = 12 g

Specific heat (c) = 4.186

Change in temperature = 5 degrees celsius

Substituting values in the equation:

[tex]\begin{aligned} \rm Q &= 12 \times 4.186 \times 5\\\\&= 251.16 \;\rm J\end{aligned}[/tex]

Converting joules into cal:

[tex]251.16 \times 0.2388 \;\rm cal = 60 \;\rm cal[/tex]

Therefore, the heat required is option b) 60 cal.

Learn more about the heat here:

https://brainly.com/question/13507243

Answer:

because our planet is spinning

which means the objects near the equator are moving at much faster velocities than objects at higher latitudes

I hope this helps✌

Answer:

energy disturbance easy

Answer:

Physical Change

Explanation:

Because the filter is removeing the dust by having the air go though a thin material.

Hope it helps!

Answer:

The charge on a neutron=1+-/neutral

It has a mass 1

The charge on electron is 1-/negative

It's mass is 1/1840

The charge on a proton is 1+

It has a mass 1 too.

Explanation:

The balanced combustion reaction is C₅H₈ + 7O₂ → 5CO₂ + 4H₂O

Hence, Option (B) is correct answer.

Combustion reaction is a type of chemical reaction between the hydrocarbon and oxygen.

CₓHₙ + O₂ → H₂O + CO₂

The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.

The given reaction is C₅H₈ + O₂ → CO₂ + H₂O

Now we have to balanced this reaction

Reactant side                           Product side

C = 5                                            C = 1

H = 8                                            H = 2

O = 2                                            O = 3

In the reactant side there are 5 C atoms and in product side there are 1 C atom. Multiply by 5 in the product side.

C₅H₈ + O₂ → 5CO₂ + H₂O

Reactant side                            Product side

C = 5                                            C = 5

H = 8                                            H = 2

O = 2                                            O = 11

In the reactant side there are 8 H atoms and in product side there are 2 H atoms. Multiply by 4 in the product side.

C₅H₈ + O₂ → 5CO₂ + 4H₂O

Reactant side                             Product side

C = 5                                            C = 5

H = 8                                            H = 8

O = 2                                            O = 14

In the reactant side there are 2 O atoms and in product side there are 14 O atoms. Multiply by 7 in the product side.

C₅H₈ + 7O₂ → 5CO₂ + 4H₂O

Reactant side                             Product side

C = 5                                            C = 5

H = 8                                            H = 8

O = 14                                           O = 14

Now the equation is balanced all the atoms of reactant side and product side are same.

Thus from above conclusion we can say that The balanced combustion reaction is C₅H₈ + 7O₂ → 5CO₂ + 4H₂O

Hence, Option (B) is correct answer.

Learn more about the Balanced equation here: brainly.com/question/26694427

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Answer:

There are 198 grams of iron in a 450-gram sample of the ore.

Explanation:

From the given information:

Given that:

100-gram sample of iron ore is found in 44g of iron.

Thus. the grams of iron that can be found in a 450-gram sample of the iron ore can be computed as follows:

100g of iron ore = 44g of iron

450 gram of iron ore = x g of iron

x(g) of iron = ( 44g of iron × 450 gram of iron ore) / 100g of iron ore

x(g) of iron =  198 grams of iron

Thus, there are 198 grams of iron in a 450-gram sample of the ore.

Answer:

hello your question is incomplete attached below is the complete question and answer

answer: attached below

Explanation:

A) attached below

B) attached below

Answer:

Properties of elements repeat in predictable patterns.

Answer:

Proton, stable subatomic particle that has a positive charge equal in magnitude to a unit of electron charge and a rest mass of 1.67262 × 10−27 kg, which is 1,836 times the mass of an electron.

Explanation:

Answer:

1.46 moles

Explanation:

You need to multiply 35.4g by Magnesium's molar mass.

Molar mass =1 mole/24.305g

(35.4g)(1 mole Mg/24.305g)= 1.46 moles <- rounded to 3 significant figures

As you can see, grams cancel out and you're left with moles.

Answer:

Gives us oxygen to live, and if produces products such as, rubber, timber, herbs, and medicines.

Answer:

no

hope this helps

:)

Explanation:

Answer:

the positively protons cancel oit the negatively charged neutrons

Considering the definition of atom, the correct answer is option D. The positively charged protons cancel out the  negatively charged electrons.

The atoms that are present in all bodies are made up of electrons, protons, and neutrons. All three have mass, but only the electron and the proton have charge. The electron has a negative charge, and the proton has a positive charge.

Protons and neutrons reside together in the nucleus of the atom. The electrons are attracted to the protons of the  nucleus by the force that exists between particles with opposite electrical charge.

A neutral atom is one that lacks an electric charge due to a compensation between the number of its protons and electrons, that is, they have the same number of protons and electrons, since the total of positive charges of the protons cancels the total of charges. negative electrons.

Finally, the correct answer is option D. The positively charged protons cancel out the  negatively charged electrons.

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