True or false let me know ASAP

Answer: 2) Electron X absorbs energy when it changes to a higher energy level.

Explanation:

The electrons in an atom exist in various energy levels. When an electron moves from a lower energy level to a higher energy level, energy is absorbed by the atom. When an electron moves from a higher to a lower energy level, energy is released (often as light).

Answer:

You need to convert 27.8 miles to km and gallon to liters, then

(km/L) x #L = ?

27.8×112

=?

?×1gal

=?

?×1mi

=?

=?×?×?

answer

Answer:

33 km in 3 hours

11/1= 11

11*3=33

Explanation:

Answer:

hope it helps you.......

Answer:1.8 moles Fe and 2.7 moles CO2

Explanation:

Answer:

1.8 moles Fe and 2.7 moles CO2

The given question is incomplete. the complete question is:

Write the net ionic equation for the reaction [tex]2AgNO_3(aq)+(NH_4)_2CO_3(aq)->Ag_2CO_3(s)+2NH_4NO_3(aq)[/tex]

Answer:  [tex]2Ag^+(aq)+CO_3^{2-}(aq)\rightarrow Ag_2CO_3(s)[/tex]

Explanation:

Spectator ions are defined as the ions which does not get involved in a chemical equation or they are ions which are found on both the sides of the chemical reaction present in ionic form.

The given chemical equation is:

[tex]2AgNO_3(aq)+(NH_4)_2CO_3(aq)->Ag_2CO_3(s)+2NH_4NO_3(aq)[/tex]

The complete ionic equation is:

[tex]2Ag^+(aq)+2NO_3^-(aq)+2NH_4^+(aq)+CO_3^{2-}(aq)\rightarrow Ag_2CO_3(s)+2NH_4^+(aq)+2NO_3^-(aq)[/tex]

The ions which are present on both the sides of the equation are ammonium and nitrate ions and hence are not involved in net ionic equation.

Hence, the net ionic equation is [tex]2Ag^+(aq)+CO_3^{2-}(aq)\rightarrow Ag_2CO_3(s)[/tex]

Answer:Metallic and covalent bonds are strongly attractive; hydrogen

bonding and Van der Waals forces are weakly attractive.

Answer:

Metallic and covalent bonds are strongly attractive; hydrogen bonding and Van der Waals forces are weakly attractive..

trust me i just did it

Explanation:

Answer:

1/16

Explanation:

We have the half life of ²⁰O = 15 seconds

This half life means that the reactant 8s going to be half at this time

Now we have 60 seconds = 1 minute

Then in 60 seconds we are going to have 4 half life.

Then ²⁰O will be 1/2⁴

1/2⁴ = 1/16

This is the answer to this question.

Thank you!

1/16 fraction of a sample of pure ²⁰O remains after 1.0 minute

Given:

The half life of ²⁰O = 15 seconds

This half life means that the reactant 8s going to be half at this time

Now, we have 60 seconds = 1 minute

Then in 60 seconds we are going to have 4 half life.

Then ²⁰O will be 1/2⁴

1/2⁴ = 1/16

Thus, the fraction of a sample of pure ²⁰O remains after 1.0 minute is 1/16.

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Answer:

When the solar wind gets past the magnetic field and travels towards the Earth, it runs into the atmosphere .As the protons and electrons from the solar wind hit the particles in the Earth's atmosphere, they release energy – and this is what causes the northern lights.

Explanation:

Answer:

Compounds

Explanation:

It is a compound when they are separated by chemical bonds.

Compound are substances composed of two or more kinds of atoms that are joined together in a definite grouping.

The properties of a compound are distinct and different from those of the individual elements that are combined in its make-up.

Within a compound there are chemical bonds.

Answer:

B

Explanation:

No explanation needed for it i got 100% on it

Lifting the remains is the last step in the excavation of the skeletal remains. Therefore, option E is correct.

In archaeology, excavation can be described as the exposure, processing, and recording of archaeological remains. An excavation site or "dig" can be the area being studied. These locations are from one to various areas at a time while a project can be conducted over weeks to several years.

Excavation involves the recovery of various types of data from a site. This data includes ecofacts, artifacts, features, and archaeological context. Before excavating, the presence of remains can often be suggested by remote sensings, such as ground-penetrating radar.

During excavation, stratigraphic excavation removes phases of the site one layer at a time and keeps the timeline of the material remains consistent. This is done through mechanical means and the soil is processed via methods like mechanical sieving or water flotation.

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#SPJ2

Answer:

yes thats right

Explanation:

Answer:

D. -1882J

Explanation:

We can solve the energy released in a chemical reaction in an aqueous medium using the equation:

Q = -m*C*ΔT

Where Q is energy (In J),

m is mass of water (45.00g)

C is specific heat of water (4.184J/g°C)

And ΔT is change in temperature (25.00°C - 15.00°C = 10.00°C)

Replacing:

Q = -45.00*4.184J/g°C*10.00°C

Q = -1882J

Right answer is:

The valence of lead is 4.

Hence the name of the compound is called Lead (IV) oxide.

Given

PbO₂ compound

Required

The valence of Pb

Solution

The oxidation number of element O in the compound = -2, except for OF₂ the oxidation state = + 2 and the peroxides (Na₂O₂, BaO₂) the oxidation state = -1 and superoxide, for example KO₂ = -1/2.

The oxidation state in the uncharged compound = 0,

So The oxidation state of Pb :

Pb + 2.(-2) = 0

Pb - 4 = 0

Pb = +4

Answer:

the metal melts and floats

Explanation:

When potassium is added to water, the metal melts and floats. It moves around very quickly on the surface of the water. The hydrogen ignites instantly. The metal is also set on fire, with sparks and a lilac flame.

Answer:

It reacts rapidly to form a colorless solution of potassium hydroxide.

Explanation:

Potassium metal reacts very rapidly with water to form a colorless basic solution of potassium hydroxide (KOH) and hydrogen gas (H 2). The reaction continues even when the solution becomes basic. The resulting solution is basic because of the dissolved hydroxide. The reaction is exothermic.

Answer

Two different elements have similar chemical properties when they have the same number of valence electrons in their outermost energy level. ... Elements in the same column of the Periodic Table have the same number of valence electrons – that's why they have similar chemical properties.

Statement that can be considered true as regards periodic table is : A: Elements in the same column share similar properties.

Therefore, option A is correct.

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Answer:

per day means - and if means + and of means × lmk if u need help

Answer:

independent varible

Explanation:

Answer: 31.8 g

Explanation:

To calculate the moles :

[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]    

[tex]\text{Moles of} Al_2O_3=\frac{60.0g}{102g/mol}=0.59moles[/tex]

[tex]\text{Moles of} C=\frac{30.0g}{12g/mol}=2.5moles[/tex]

[tex]Al_2O_3+3C\rightarrow 2Al+3CO[/tex]  

According to stoichiometry :

1 mole of [tex]Al_2O_3[/tex] require 3 moles of [tex]C[/tex]

Thus 0.59 moles of [tex]Al_2O_3[/tex] will require=[tex]\frac{3}{1}\times 0.59=1.77moles[/tex]  of [tex]C[/tex]

Thus [tex]Al_2O_3[/tex] is the limiting reagent as it limits the formation of product and [tex]C[/tex] is the excess reagent as it is present in more amount than required.

As 1 mole of [tex]Al_2O_3[/tex] give = 2 moles of [tex]Al[/tex]

Thus 0.59 moles of [tex]Al_2O_3[/tex] give =[tex]\frac{2}{1}\times 0.59=1.18moles[/tex]  of [tex]Al[/tex]

Mass of [tex]Al=moles\times {\text {Molar mass}}=1.18moles\times 27g/mol=31.8g[/tex]

Thus 31.8 g of [tex]Al[/tex] will be produced from the given masses of both reactants.

Answer:

the gravity

Explanation:

i hope you help this answer

Answer:

the ocean

Explanation:

Answer:

264.28 L of CO₂

Explanation:

We'll begin by calculating the number of moles present in 275 g of NO₃¯. This can be obtained as follow:

Mass of NO₃¯ = 275 g

Molar mass of NO₃¯ = 14 + (16×3) = 14 + 48 = 62 g/mol

Mole of NO₃¯ =?

Mole = mass / molar mass

Mole of NO₃¯ = 275 / 62

Mole of NO₃¯ = 4.44 moles

Next, we shall determine the number of mole of CO₂ produced from the reaction. This can be obtained as follow:

2NO₃¯ + 5CO + 2H⁺ —> N₂ + H₂O + 5CO₂

From the balanced equation above,

2 moles of NO₃¯ reacted to produced 5 moles of CO₂.

Therefore, 4.44 moles of NO₃¯ will react to produce = (4.44 × 5) / 2 = 11.1 moles of CO₂.

Thus, 11.1 moles of CO₂ were produced from the reaction.

Finally, we shall determine the volume of CO₂ produced each day. This can be obtained as follow:

Temperature (T) = 17 °C = 17 °C + 273 = 290 K

Pressure (P) = 1 atm

Number of mole (n) of CO₂ = 11.1 moles

Gas constant (R) = 0.0821 atm.L/Kmol

Volume (V) of CO₂ =?

PV = nRT

1 × V = 11.1 × 0.0821 × 290

V = 264.28 L

Thus, 264.28 L of CO₂ would be produced each day.

The volume of [tex]\rm CO_2[/tex] produced has been 264.28 L.

The volume of the carbon dioxide gas produced can be calculated with the ideal gas equation.

The moles of [tex]\rm NO_3^-[/tex] has been:

Moles = [tex]\rm \dfrac{weight}{molecular\;weight}[/tex]

Moles of 275 g  [tex]\rm NO_3^-[/tex] has been:

Moles = [tex]\rm \dfrac{275}{62}[/tex]

Moles of  [tex]\rm NO_3^-[/tex] = 4.44 moles

The balanced equation gives that with the reaction of 2 moles [tex]\rm NO_3^-[/tex] , 5 moles carbon dioxide has been formed.

Moles of carbon dioxide formed with 4.44 mol [tex]\rm NO_3^-[/tex] has been:

2 moles [tex]\rm NO_3^-[/tex] = 5 moles [tex]\rm CO_2[/tex]

4.44 moles [tex]\rm NO_3^-[/tex]  = 11.1 moles [tex]\rm CO_2[/tex].

The volume of the [tex]\rm CO_2[/tex] can be calculated as:

Pressure [tex]\times[/tex] Volume = moles [tex]\times[/tex] Rydberg constant [tex]\times[/tex] temperature

For the [tex]\rm CO_2[/tex] produced:

1 atm [tex]\times[/tex] Volume = 11.1 mol [tex]\times[/tex] 0.0821 atm.L/K.mol [tex]\times[/tex] 290 K

Volume = 264.28 L.

The volume of [tex]\rm CO_2[/tex] produced has been 264.28 L.

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Answer:

False

Explanation:

Water is said to have a higher heat capacity than soil and stones, so the ocean takes much longer to heat and to cool than the land. 2. Coastal areas have more moderate temperatures than landlocked areas because of the heat capacity of the ocean and hence the answer is false.

Answer:

False.

Explanation:

Molar concentration of acetic acid = 1 M

Given

acetic acid in 6% solution (d=1 g/ml)

Required

molar concentration

Solution

mass of acetic acid in solution

mass = density x %mass

mass = 1 g/ml x 6%

mass = 0.06 g/ml ⇒ 60 g/L

MW acetic acid = 60 g/mol

molarity acetic acid = mass : MW

molarity = 60 g/L : 60 g/mol

molarity = 1 mol / L = 1 M

Answer : The mass in grams of calcium sulfate is 0.16 grams.

Explanation :

Molarity : It is defined as the number of moles of solute present in one litre of solution.

Formula used :

[tex]Molarity=\frac{\text{Mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution}}[/tex]

Solute is, [tex]CaSO_4[/tex]

Given:

Molarity of [tex]CaSO_4[/tex] = 0.0025 mol/L

Molar mass of [tex]CaSO_4[/tex] = 136 g/mole

Volume of solution = 485 mL

Now put all the given values in the above formula, we get:

[tex]0.0025=\frac{\text{Mass of }CaSO_4\times 1000}{136\times 485}[/tex]

[tex]\text{Mass of }CaSO_4=0.16g[/tex]

Thus, the mass in grams of calcium sulfate is 0.16 grams.

Answer:

of 7 I guess the and is 2 I don't know anything about 8

Answer:

0.92^n

Explanation:

Given that :

Initial amount of vinegar = 1 Litre

Number of litres removed repeatedly = 0.08 Litre

Since the amount removed each time is constant, then ;

Initial % = 100% = 100/100 = 1

. Using the relation :

Amount of vinegar in mixture :

Initial * (1 - amount removed / initial amount)^n

n = number of times repeated

1 * (1 - 0.08/1)^n

1 * (1 - 0.08)^n

1 * 0.92^n

Hence,

For nth removal,

Concentration will be :

0.92^n ; for n ≥ 1