Which of the following is an example of a chemical change?

a rock being crushed into pieces by a hammer


a rock becoming smaller over time due to wind


a rock's appearance changing over time due to exposure to acid rain


all of the above

Ionization energy refers to the amount of energy needed to remove an electron from an atom. Ionization energy decreases as we go down a group. Ionization energy increases from left to right across the periodic table.

Ionization is the process by which ions are formed by the gain or loss of an electron from an atom or molecule.

Ionization energy is defined as the energy required to remove the most loosely bound electron from a neutral gaseous atom.

When we move across a period from left to right then there occurs a decrease in atomic size of the atoms. Therefore, ionization energy increases along a period but decreases along a group.

Smaller is the size of an atom more will be the force of attraction between its protons and electrons. Hence, more amount of energy is required to remove an electron.

Thus, we can conclude that the energy required to remove an electron from a gaseous atom is called ionization energy.

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Answer: You should learn the symbols for the eight most abundant elements in the Earth's crust (Oxygen (O), Silicon (Si), Aluminum (Al), Calcium (Ca), Iron (Fe), Magnesium (Mg), Sodium (Na), and Potassium (K) .

Explanation:

Answer:

C 20 L

Explanation:

Apply the formula C1 × V1 = C2 × V2 where, C1 = initial concentration , 12M V1 = initial Volume , ? C2 = Final concentration,0.25M V2 = Final Volume , 1.0L V1 = C2 x V2

Ionic compounds are substances that are made up of ions. There is no ionic formula as carbon and oxygen do not form an ionic compound.

Ionic compounds are compounds that have two differently charged species that bind together. The positive metal species binds to the negative nonmetal species.

Carbon and oxygen both are nonmetals and cannot form a bond as nonmetals gain electrons and metals donates electrons for the bond formation.

Therefore, no ionic compound is present for carbon and oxygen.

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Answer:

"They drink water when it is aivailable but can go weeks without it, they rely on morning dew and the water content of their food". they can use plants as resources to live.

For the neutralization reaction involving HNO₃ and Ca(OH)₂, liters of 1.55 M HNO₃ are needed to react with 45.8 ml of a 4.66 m Ca(OH)₂ solution is 0.270 L.

Those reactions in which acids and bases will combine with each other for the formation of water molecule and salt, is known as neutralization reaction.

Given chemical reaction is:

2HNO₃ + Ca(OH)₂ → 2H₂O + Ca(NO₃)₂

Moles (n) of Ca(OH)₂ will be calculated by using the below formula:
M = n/V, where

M = molarity = 4.66M

V = volume = 45.8 mL = 0.045 L

n = (4.66)(0.045) = 0.2097 mol

From the stoichiometry of the reaction,

1 mole of Ca(OH)₂ = reacts with 2 moles of HNO₃

0.2097 mole of Ca(OH)₂ = reacts with 2×0.2097=0.419 moles of HNO₃

Again by using the molarity equation volume will be calculated for HNO₃ as:

V = (0.419) / (1.55) = 0.270 L

Hence required volume of HNO₃ is 0.270 L.

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According to the diagram, cellular respiration and photosynthesis are the phrases that best summarize the events taking place in Step 2.

It is the way carbon circulates through the atmosphere, the oceans, and the Earth's surface and interior.

Cellular respiration and photosynthesis respectively release and capture carbon dioxide from the atmosphere, as a by-product or input of their biochemical pathways, carbon from CO2 is absorbed by plants and released along with water vapor during animal respiration.

Therefore, we can conclude that according to the diagram, cellular respiration and photosynthesis are the phrases that best summarize the events taking place in Step 2.

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I'd say Photosynthesis and Storing carbon dioxide in living organisms.

But the person above me shows alot more detail than I have.

2.05 × 10²³ formula units

Given data:Mass of AgF =  43.15 gNumber of formula units = ?Solution:Number of moles of AgF:Number of moles = mass/ molar massNumber of moles = 43.15 g/ 126.87 g/molNumber of moles = 0.34 molNow Number of formula units will be determine 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 number1 mole = 6.022 × 10²³ formula units0.34 mol × 6.022 × 10²³ formula units2.05 × 10²³ formula units

Answer:

Burning, cooking, rusting, and rotting

Answer:

Energy can exist in many forms within a system and may be converted from one form to another within the constraint of the conservation law. These different forms include gravitational, kinetic, thermal, elastic, electrical, chemical, radiant, nuclear, and mass energy.

Explanation:

Answer:

Explanation:

When an atom gains/loses an electron, the atom becomes charged, and is called an ion. Gaining an electron results in a negative charge, so the atom is an anion. Losing an electron results in a positive charge, so atom ion is a cation.

It means that the 'Atom A' is giving that is, losing the electrons

PV=nRT

n = mole = 2.1 g : 32 g/mole = 0.065

T = 13 + 273 = 286 K

V = nRT/P

V = (0.065 x 0.08205 x  286)/0.1

V = 15.253 L

A laboratory report is an important part of the scientific process that communicate the important work that has been done.

Your information is incomplete. Therefore, an overview of a laboratory report will be given. The laboratory report is important for future studies a d experiments.

A laboratory report is broken down intosections such as title, abstract, introduction, methods, materials, results, discussion conclusion, and references.

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Answer:

A rise in global temperatures increases the severity and likelihood of storms, floods,wildfires, droughts, and heat waves

Explanation:

no explanation please tag me as brainleast thankyou

i guess this is the answer .

1. double replacement[two of the chemical species(B and D)exchanged positions]

2. Combustion(the reaction with oxygen produced CO2 and water; products of Combustion)

3. Single replacement(only one chemical specie[B] exchanged position)

4. Combination(the two reactants formed a single product)

5. Decomposition(a compound released two constituent products)

6. 1PbCl2 + 2AgNO3 = 1Pb(NO3)2 + 2AgCl. it is a double replacement reaction since two chemical species(Chlorine(Cl) and Nitrogen(iii)oxide[NO3]) exchanged positions.

7. 1NH3 + HCL = NH4Cl. it is a combination reaction since two reactants formed a single product.

8. 2AlCl3 + 3Na2SO4 = 1Al(SO4)3 + 6NaCl. it is a double replacement reaction since two chemical species(chlorine[Cl] and sulphate[SO4]) exchanged positions.

9. 1Zn + 1S = 1ZnS. it is a combination reaction since two reactants formed a single product.

10. 1Al2(SO4)3 + 3BACl2 = 3BASO4 + 2ALCL3. it is a double replacement reaction since two chemical species(chlorine[Cl] and sulphate[SO4]) exchanged positions.

11. 1Al2S3 = 2Al + 3S. it is a decomposition reaction since a reactant released two constituent products.

12. 1H2SO4 + 1Fe = 1H2 + 1FeSO4. it is a single replacement reaction since one chemical specie(sulphate[SO4]) exchanged position.

13. C12H22O11 + 12O2 = 12CO2 + 11H2O. it is a combustion reaction since a reactant combined with oxygen to release carbon dioxide(CO2) and water(H2O).

14. 1Mg(OH)2 + 1H2SO4 = 1MgSO4 + 2H2O. it is a double replacement reaction since two chemical species(hydroxide[OH] and sulphate[SO4]) exchanged positions.

15. 2NaOH + 1CuSO4 = Na2SO4 + Cu(OH)2. it is a double replacement reaction since two chemical species(hydroxide[OH] and sulphate[SO4]) exchanged positions.

16. 1C4H12 + 7O2 = 6H2O + 4CO2. it is a combustion reaction since a reactant combined with oxygen to release carbon dioxide(CO2) and water(H2O).

17. 4Fe + 3O2 = 2Fe2O3. it is a combination reaction since two reactants formed a single product.

18. 1Mg3(PO4)2 + 3H2 = 3Mg + 2H3PO4. it is a single replacement reaction since one chemical specie(phosphate[PO4]) exchanged position.

19. 2NH4NO3 = 2N2O + 4H2O. it is a decomposition reaction since a reactant released two constituent products.

20. 1Cl2 + 2KBr = 2KCl + 1Br2. it is a single replacement reaction since one chemical specie(potassium[K]) exchanged position.

Answer:

Yes,

Chemical Reactivity of metals decrease as you go left to right of the periodic table Chemical Reactivity increases as you go down the group....

Explanation:

Hope it Helps!!!

:)

One of the flaws of this solution is that because it is programmed at night data loss is possible if a failure occurs at this time.

This is used to save important information or date from a device such as a computer periodically.

Tape cardridge backup is the best option if a lot of data has to be saved because they are efficient and low cost.

The only problem is that because the back up is automatically programmed at night, a failure such as a problem in electricity implies valuable data might be lost.

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The molarity of an HCl solution if 41.73 mL of HCl reacts with 7.8111 grams of sodium carbonate is 1.77M. Details about molarity can be found below.

The molarity of a solution can be calculated by dividing the number of moles of the substance by its volume.

According to this question, 7.8111 grams of sodium carbonate (106 g/mol) is given. The number of moles of sodium carbonate is calculated as follows:

no of moles = 7.811g ÷ 106g/mol = 0.074mol

Molarity of HCl = 0.074mol ÷ 0.04173L

Molarity of HCl = 1.77M

Therefore, the molarity of an HCl solution if 41.73 mL of HCl reacts with 7.8111 grams of sodium carbonate is 1.77M.

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Taking into account the definition of molarity, 4.08 grams of ammonium sulfide are present in 3.00 L of a 0.0200 M solution.

Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

[tex]Molarity=\frac{number of moles}{volume}[/tex]

Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].

In this case, you know:

Replacing in the definition of molarity:

[tex]0.0200 \frac{moles}{liter}=\frac{number of moles}{3 L}[/tex]

Solving:

0.0200  [tex]\frac{moles}{liter}[/tex]× 3 L= number of moles

0.06 moles= number of moles

On the other side, the molar mass is the amount of mass that a substance contains in one mole. In this case, the molar mass of ammonium sulfide is 68 g/mole.

Then, the amount of mass contained in 0.06 moles is calculated as:

0.06 moles×[tex]\frac{68 grams}{1 mole}[/tex]= 4.08 grams

Finally, 4.08 grams of ammonium sulfide are present in 3.00 L of a 0.0200 M solution.

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Answer:

4.09 is the correct answer.

There are several things that would happens,if all of the fossil fuels were used.The most important is in bold,but I made a quick list below to note.<3

-War Would Break Out

-The Earth's Climate Would Be Far From Safe & Would Cause A Huge Decrease In Population

-A Huge Portion Of The World Would Be Living In Poverty

-Failing Economies

-A Worthless Planet

-Also want to not that it is almost impossible to run out of fossil fuels, but if we do,it won't be thousands of years in the future.

I HOPE THIS HELPS! & and good luck on your assignment.

Answer:

Below:

Explanation:

a)2 Na + F2 = 2 NaF

It's already balanced.

Type is synthesis.

b)H2 + I2 = 2 HI

It's balanced now.

Type's synthesis.

Option A

On products side

On reactants side

Hence balanced

If the self ionization reaction is endothermic then it will shift on right side from equilibrium if we increase the temperature.

Endothermic reactions are those reactions in which heat or energy is absorbed by the reactants for the formation of product.

If the self ionization reaction is endothermic in nature then in this condition at the equilibrium if we increases the temperature then the formation of ions increases as a result of the shift of the reaction towards the right side.

Hence, by increasing the temperature we can predict whether the reaction is endothermic or not.

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The required amount of silver nitrate to produce 16.2g of silver is 25.48 grams.

Relation between the mass and moles of any substance will be represented as:

n = W/M, where

Moles of silver = 16.2g / 107.8g/mol = 0.15mol

From the stoichiometry of the given reaction it is clear that, same moles of silver nitrate is required to produce same moles of silver. So 0.15 moles of silver nitrate is required.

Mass of silver nitrate = (0.15mol)(169.87g/mol) = 25.48g

Hence required mass of silver nitrate is 25.48g.

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Mole fraction is the ratio of the constituent moles to the total constituents. The mole fraction of sodium chloride is 0.0443.

A mole fraction is the proportion of the moles of the component in a total component present.

In 100 gm of solution 13.0 5 means, there is 13.0 gm of sodium chloride present. The mass of water is calculated as,

100 - 13.0 = 87.0 gm

Moles of sodium chloride is calculated as:

[tex]\begin{aligned} \rm moles &= \rm \dfrac{mass}{molar\; mass} \\\\&= \dfrac{13}{58}\\\\&= 0.224 \;\rm moles\end{aligned}[/tex]

Moles of water are calculated as:

[tex]\begin{aligned} \rm moles &= \rm \dfrac{mass}{molar\; mass} \\\\&= \dfrac{87}{18}\\\\&= 4.83\;\rm moles\end{aligned}[/tex]

Now, moles fraction is calculated by dividing moles of sodium chloride by total moles as,

[tex]\begin{aligned} \text{Mole fraction of NaCl} &= \dfrac{0.224}{0.224 + 4.83}\\\\&= 0.0443\end{aligned}[/tex]

Therefore, the mole fraction of sodium chloride is 0.0443.

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Answer:

41.25

Explanation:

I am not sure if your teacher expects you to just find specific heat yourself, but if they do answer it using as below:

Quick search shows aluminium specific heat is 0.90 J/gC.

use formula: q = mcΔT (q = heat, m= mass, c= specific heat, ΔT is temperature change)

q = mcΔT

q/(mc) = ΔT

32.3/(0.87 x 0.90) = ΔT

ΔT = 41.25 C

When more products or reactants are added to a reaction that is in equilibrium, the equilibrium will shift so as to annul the effects of adding the products/reactants.

It states that when a reaction is in equilibrium and one of the constraints that affect the rates of chemical reactions is applied, the equilibrium will shift accordingly so as to annul the effects of the added constraint.

Thus, if more products are added, the equilibrium will shift to produce more reactants. If more reactants are added, the equilibrium will shift to produce more products.

Hence, what will happen to the equilibrium position depends on whether CHO2– is a reactant or product.

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