when the pH of a solution changes from a ph of 5 to a ph of 3, the hydronium ion concentration is

Answer:

Because of its malleability.

Explanation:

Magnesium is alkaline earth metal.

It is present in second group.

It is shiny gray color metal.

It is lighter but strong.

Its density is 1.738 g/mL.

It is soft and can be malleable. Magnesium ribbons are also formed by stretching the magnesium metal and this is due to the malleability of magnesium.

Magnesium ribbon burns and produces heat.

It is used to make the many light weight products such as many parts of car,  phone, laptop, luggage etc.

It is also used to remove the sulfur such as from iron and steel.

It is also used in fireworks.

It is also used in medicine such as for constipation.

It is used as antiacid for heart burn.

Explanation:

given

mass =85*1000=85000kg

volume=850/100*100*100m3

now,

density=mass / volume

=85000kg/850000000m3

=1/10000kg/m3

=0.0001kg/m3

the density of the rock is 0.0001kg/m3.

Answer :the electrolytes conduct electricity due to movement of ions (cations and anions), while the conductors conduct electricity due to movement of electrons only.

Explanation:

Answer:

0.1 mol

Explanation:

Number of mole= mass/molar mass

lithium have a mass number of 7 and oxygen have a mass number of 16.

so, (7x2) + 16

= 30

therefore, number of moles = 2.93/30

= 0.10

Answer:

Mass of Li2O = 2.93g

Molecular mass of Li2O = 29.88g/mol

No of mole of Li2O = Mass/Molar mass

No of mole of Li2O = 2.93/29.88

No of mole of Li2O = 0.0981mol

Explanation:

mass of an object affect the density and object if the the volume is keep constant.

here we can explain by using the example.

if the mass of an object is 30kg. and volume is 2m3

then density pf given substance is become 15kg/m3

again,

if the mass of the is 40kg/m3 and volume is same

then density is become 20kg/m3 (formula=kg/m3)

here above density and below density is becime different by changing the mass of an object and affect the density and objecy although volume is kept constant or same

Answer: An increase in mass will increase the density

A decrease in mass will decrease the density

Explanation: So any changes in the mass of the object will affect its density even with constant volume. Mass is directly proportional to density. So when mass is increased density will increase as well and vice versa.

Answer:

Synthesis

Explanation:

Reaction Given:

        NH₃+ HCI ------> NH₄Cl

Type of reaction = ?

Solution:

Look at the reactants and products of the reaction to know the type of reaction

          NH₃+ HCI ------> NH₄Cl

In this reaction two reactant combine and give 1 products.

Reactant of the reaction

NH₃ = Ammonia

HCl = Hydrochloric acid

Product of the reaction

NH₄Cl = Ammonium chloride

So,

That ammonia (NH₃) react with Hydrochloric acid (HCl) and produces salt.

in this reaction NH₃ is a week base and take a proton from HCl and form ammonium ion and Cl ion. these two ions in combine form gives a salt called ammonium chloride.  

Type of Reaction:

This is type of synthesis reaction, in which NH₃ and HCl combine and form a new compound that is ammonium chloride salt (NH₄Cl). As the synthesis reaction is that reaction in which two are more compounds or molecules combine and form a new compound.

Answer:

B. To ask and answer scientific questions

To ask and answer scientific questions is the job of a scientist. Therefore, the correct option is option B.

The systematic examination of natural events through theoretical analysis and experimental is referred to as scientific research. Its main goal is to increase our knowledge of and comprehension of numerous scientific disciplines as well as our understanding of the world around us. A hypothesis is a put forth explanation for a phenomenon based on prior information or observation that serves as the starting point for scientific inquiry. Then, using a series of carefully planned tests or observations, this hypothesis is verified.

To know more about scientific, here:

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Answer:

                    0.412 Kg of Solution

Explanation:

                    To solve this problem we will first find the number of grams of solute contained by the given amount of solution as,

                      w/w%  =  weight of solute / weight of solution × 100

Solving for weight of solute,

                      Weight of solute = w/w% × weight of solution / 100

Putting values,

                      Weight of solute = 10.9 × 500 g / 100

                       Weight of solute = 54.5 g

Hence,

                  54.5 g of solute was contained by  =  500 g of solution

So,

               45.0 g of solute will be contained by  =  X g of solution

Solving for X,

                     X =  45.0 g × 500 g / 54.5 g

                      X =  412.84 g

Or,

                     X  =  0.412 Kg of Solution

Final answer:

To obtain 45.00g of 4-methyl-2-pentanone from a 10.9% w/w solution, the student should measure out 412.84g of the solution.

Explanation:

To calculate the mass of the solution the student should use to get 45.00g of 4-methyl-2-pentanone from a 10.9% w/w solution, we first need to understand what a w/w solution means. It indicates that for every 100g of solution, there is 10.9g of the solute (4-methyl-2-pentanone). To find the mass of the solution needed for 45.00g of the solute, the following calculation should be performed:

Mass of solute (desired) = % w/w × mass of solution
Therefore, mass of solution = Mass of solute (desired) / % w/w

So:

Mass of solution = 45.00g / 0.109 = 412.84g

The student should therefore measure out 412.84g of the 10.9% solution to obtain 45.00g of 4-methyl-2-pentanone.

Answer:

the temperature difference between the water and the ice cubes causes heat to be transferred from the water to the ice cubes,.

Explanation:

Heat always travels to where it is colder. Think about how ice cubes melt. They are very cold so the heat is transferred to them from he warmer water and they melt.

hope this helps! i would really appreciate brainliest :)

Answer:

temperature hear

Explanation:

Answer:

Net ionic equation:

Ba²⁺(aq) + SO₄²⁻(aq)  →   BaSO₄(s)

Explanation:

Chemical equation:

BaCl₂ +  Na₂SO₄   →   BaSO₄ + NaCl

Balanced Chemical equation:

BaCl₂(aq) +  Na₂SO₄(aq)   →   BaSO₄(s) + 2NaCl(aq)

Ionic equation:

Ba²⁺(aq) + 2Cl⁻(aq) + 2Na⁺(aq) + SO₄²⁻(aq)  →  BaSO₄(s)+ 2Na⁺(aq) + 2Cl⁻ (aq)

Net ionic equation:

Ba²⁺(aq) + SO₄²⁻(aq)  →   BaSO₄(s)

The Cl⁻(aq) and Na⁺ (aq) are spectator ions that's why these are not written in net ionic equation. The BaSO₄ can not be splitted into ions because it is present in solid form.

Spectator ions:

These ions are same in both side of chemical reaction. These ions are cancel out. Their presence can not effect the equilibrium of reaction that's why these ions are omitted in net ionic equation.  

A clear prediction of the anticipated results in an experimental design is known as "Hypothesis".

Explanation:

A theory or hypothesis are often used clearly as a suggested event descriptive one. The scientific methods need that one can be able to examine for a hypothesis termed as scientific hypothesis.

A working in hypothesis is a proposed provisionally accepted hypothesis for on-going research that starts with an appropriate amount of conclusion and thoughts, also known as "Educated Guess".

According to researchers like Schick and Vaughn the weighing up an alternative hypotheses might be taken into understanding like Parsimony, testability, Fruitfulness, Scope and Conservatism.

Explanation:

Answer:

A proton has positive charge of 1, that is, equal but opposite to the charge of an electron. A neutron, like the name implies, is neutral with no net charge. The charge is believed to be from the charge of the quarks that make up the nucleons (protons and neutrons). need a pictur of the question

Explanation:

Answer:

24 hours

Explanation:

Frozen foods are foods that were put in a refrigerator. The essence of putting food in a refrigerator is to lower the rate at which microbes cause the spoilage of the food by lowering its temperature considerably.

After 24 hours, microbes must have commenced action on non-frozen ready to eat foods causing them to spoil in not more than 24hours.

Non-frozen ready-to-eat foods should be consumed within : 24 hours

Non-frozen foods are to be consumed within 24 hours, because microbes that causes the spoilage of foods starts acting on ready-to-eat foods, after 24 hours. ready-to-eat foods are foods are processed foods that can be consumed immediately. example : smoked fish and salads

Frozen foods are refrigerated in order to keep the temperatures of the foods below the allowable temperature in which microbes tend to act on ready-to-eat foods.

Hence we can conclude that Non-frozen ready-to-eat foods should be consumed within 24 hours.

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Answer:

10 electrons

Explanation:

Answer:

The answer is: 10 electrons

Explanation:

Answer:

ivy growing around the pole of a fence

Explanation:

Answer:

the answer is, colliding hydrogen atoms to produce heavier helium atoms.

Answer: 0.0000332mol

Explanation: 1mole of CCl4 contains 6.02x10^23 molecules.

Therefore, X mol of CCl4 will contain 2 x 10^19 molecules i.e

Xmol of CCl4 = 2 x 10^19/ 6.02x10^23 = 0.0000332mol

Answer:

7

Explanation:

Answer:

in ibs it is 1.918e-5 ibs

Explanation:

Answer:

2.95 [tex]\times 10^{-9}[/tex] is the fraction of the nucleus is present in atom.

Explanation:

Given:

The diameter of the nucleus - 10A

The diameter of atom - 1.5 A

From this, we can find the radius of nucleus and atom i.e.

For nucleus [tex]=\frac{10}{2}[/tex]

For atom [tex]= \frac{1.5}{2}[/tex]

Now, the fraction of nucleus [tex]= \frac{volume of nucleus}{volume of atom}[/tex]

                                               = [tex]\frac{4}{3}\pi (\frac{10}{2})\frac{3.14}{2}\pi (\frac{10}{2})^3[/tex]

  or,                                         = [tex](\frac{10}{1.5})^3[/tex]

                                               = 2.95 [tex]\times 10^{-9}[/tex]

Therefore, 2.95 [tex]\times 10^{-9}[/tex] is the fraction of nucleus in the atom.

The volume of a nucleus is found by the formula for the volume of a sphere. Given the diameters specified, the nucleus occupies a very small fraction, specifically one trillionth, of the total atomic volume. Hence, atoms are mostly comprised of empty space.

Both an atom and its nucleus are approximately spherical in shape. To calculate the volume of each, we can use the formula for the volume of a sphere, which is 4/3π*r3.

Hence, the volume fraction of the atom taken up by the nucleus would be the ratio of the volume of the nucleus to the volume of the atom.

The volume of the nucleus (Vn) is 4/3π*(101 A)3 = 4,188.79 cubic A.

The volume of the atom (Va) is 4/3π*(105 A)3 = 4.18*1015 cubic A.

Finally, the volume fraction of the atom taken up by the nucleus is

Vn/ Va = 4,188.79 / 4.18*1015 = 1*10-12 or one trillionth.

So, the nucleus occupies a very small proportion of the total atomic volume. This explains why atoms are mostly empty space.

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Answer:

Both are endothermic reactions.

Explanation:

Chemical equation:

1/2H₂(g) + 1/2I₂(g)  →  HI(g)  + 6.2 kcal/mol

Chemical equation:

21.0 kcal/mol + C(s) + 2S(s)  → CS₂

Both reaction are endothermic because heat is added in both of reactions.

Endothermic reactions:

The type of reactions in which energy is absorbed are called endothermic reactions.

In this type of reaction energy needed to break the bond are higher than the energy released during bond formation.

For example:

C + H₂O   →  CO  + H₂

ΔH = +131 kj/mol

it can be written as,

C +  H₂O  + 131 kj/mol  →  CO  + H₂

Exothermic reaction:

The type of reactions in which energy is released are called exothermic reactions.

In this type of reaction energy needed to break the bonds are less than the energy released during the bond formation.

For example:

Chemical equation:

C + O₂   →  CO₂

ΔH = -393 Kj/mol

it can be written as,

C + O₂   →  CO₂ + 393 Kj/mol

Answer:

The sodium atom becomes a positive ion and the chlorine atom becomes neg.

Explanation:

Think about this answer

Answer

The mole ratio is 1:1

The molar mass of potassium hydrogen phthalate (C8H5KO4) is 204.22g/mol

The mass of C8H5KO4 is 0.43g

The no of moles of C8H5KO4 = mass/molar mass

No of Moles of C8H5KO4 = 0.000210557242mol

From Mole ratio the no of mole of NaOH that reacted with C8H5KO4 0.000210557242

Therefore, molaroty of NaOH is mole of NaOH/the Volume in L

Molaroty if NaOH = 0.000210557242/0.02411 = 0.08733M

Answer:  

I had to do some research, because I not familiar with Hess's Law.

Hope this helps :)

Stating Hess's Law

Hess's Law is the most important law in this part of chemistry. Most calculations follow from it. It says "The enthalpy change accompanying a chemical change is independent of the route by which the chemical change occurs."

Explaining Hess's Law

Hess's Law is saying that if you convert reactants A into products B, the overall enthalpy change will be exactly the same whether you do it in one step or two steps or however many steps.

Answer:

Hess's Law of Constant Heat Summation (Hess's Law) states that regardless of the multiple stages or steps of a reaction, the total enthalpy change for the reaction is the sum of all changes

Explanation:This law is a manifestation that enthalpy is a state function.

Answer:

It increased the avaiability of food for humans

Explanation:

Answer:

Sodium hydroxide has the formula NaOH and it contains three atoms, one each of Sodium, Hydrogen and Oxygen.

Explanation:

Answer: 1.806 x 10^24 atoms

Explanation:Please see attachment for explanation

Answer:

Na+ e- - Na

Explanation:

Answer:

Option A is correct: You have three times the number of particles that are in 12 grams of carbon-12

Explanation:

Data given:

3 moles of substance equal to how many particles of 12 g of carbon-12.

Solution:

First we find the number of particles in 3 moles of substance

Formula used

          no. of moles = no. of particles / Avogadro's number

Rearrange the above formula

         no. of particles = no. of moles x Avogadro's number . . . . . . . . (1)

Where

Avogadro's number = 6.022 x 10²³

Put values in above equation

      no. of particles = 3 x 6.022 x 10²³ (particles/mol)

      no. of particles = 1.8066 x 10²⁴ Particles

So,

3 mole of substance have 1.8066 x 10²⁴ Particles

Now

we have to find number of particles in 12 g of carbon-12

for this first find no. of moles

formula used

       no. of moles = mass in grams/ molar mass . . . . . (2)

molar mass of carbon = 12 g/mol

Put values in equation 2

       no. of moles = 12 g / 12 (g/mol)

       no. of moles = 1 mole

So,

12 g of carbon 12 equal to 1 mole.

According to Avogadro's law 1 mole of any substance consists of 6.022 x 10²³ number of particles.

So

1 mole carbon = 6.022 x 10²³ particles

and 3 mole of substance = 1.8066 x 10²⁴ Particles

It means that we have three times number of particles that are in 12 g of carbon-2

So, Option A is correct.

A. You have three times the number of particles that are in 12 grams of carbon-12.

Answer:

Two physical systems are in thermal equilibrium if there is no net flow of heat between them.

Explanation:

Two Physical systems are said to be in thermal equilibrium if there is no net flow of heat energy between them when they are connected and both of the system is at the same temperature.

Thermal equilibrium is of two varieties i.e Two thermally connected bodies and Internal thermal equilibrium.

If two bodies are thermally connected to each other then there will only transfer of the heat to maintain equilibrium but no transfer of the matter and mass.

Also, a internal thermal equilibrium is maintained in a isolated body where there is no transfer of the heat from the body outside or inside of it.

Thermal equilibrium follows zeroth law of thermodynamics which says that Two bodies are in thermal equilibrium with each other if they individually are in thermal equilibrium with a third body.