6.50x10^4+8.70x10^5 express the following in scientific notation.

Answer:

Burning, cooking, rusting, and rotting

Answer:

neutral   acidic   basic      basic

Explanation:

>7 = acid    7  neutral      >7  basic

Answer:

True

Explanation:

When determining rate law, the coefficients in the balanced equation are used to determine how different concentrations affect the rate.

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

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:

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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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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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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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: lodine solution and vinegar are both soluble

Solution is the mixture of solute and solvent. Iodine solution and vinegar solution both are soluble. Iodine and vinegar are the homogenous mixture.

A solution is a homogeneous mixture of o solutes  and solvent. Solvent is the material in which a solute dissolves to produce a homogeneous mixture. Solute is the material that dissolves in a solvent to produce a homogeneous mixture in phase

Common examples of solution are sugar in water and salt in water solutions, soda water etc. In a solution, all the components that are present as a single phase. Iodine and vinegar both molecule shows homogenous mixture.

Hence, the iodine solution and vinegar solutions are soluble, both compounds are homogenous mixture. Both are totally soluble.

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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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Answer:

1 sigma bond and 2 pi bonds

Explanation:

A triple bond is made up of 1 sigma bond and 2 pi bonds.

Given example is that of ethyne

Answer:

1 [tex]\sigma[/tex] and 2π bonds

Explanation:

Always remember that

The general example is

N=N bond

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.

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

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!!!

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What causes deep, cold currents to form in the oceans near the poles? The sinking of dense, cold water paired with high salinity.

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.

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

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:

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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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:

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

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

In a neutral atom, the number of electrons equal to the number of protons

Hydrogen is the element with atomic number one. The representation of the hydrogen molecule with a double bond is incorrect.

A double bond is a type of chemical bond that involves two pairs or four bonding electrons of the atom in a molecule. They are stronger and shorter bonds compared to single bonds.

A hydrogen molecule can never have a double bond in its molecule as it has only a single electron in its shell and cannot form a double bond due to the lack of four electrons.

Therefore, hydrogen molecules cannot form a double bond.

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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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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