9. In what use-case would you choose to use a pure
metal over an alloy?
a.
b.
C.
d.
When making intricate jewelry.
When building a skyscraper
When making a baseball bat.
When making a kitchen knife.

To find the volume of an object, you can use water.

You would do this by using a graduated cylinder, filling it with water and record its initial volume. (This is your initial volume).

You would then add the toy dinosaur and measure again the volume of the water after the dinosaur was included. (This is your final volume).

You would then subtract the Final volume - Initial volume = Total volume of dinosaur

This would then give you the volume of the dinosaur.

lithium and all above

all of the elements are nonmetals except for lithium, therefore lithium can have an ionic bond with any of the other elements.

The argument for Harnessing Human Energy  for the School Principal is written below

Dear Principal Tom,

Human power as we have been taught is the effort or energy created by a human being. It is one that can be said to be pace of work per time. The Muscles act as the main source of power, and body heat can also be used for tasks like warming food, shelters, or other people.

There are lot of reasons why we need to make use of these energy and this is coming form the fact that energy from the environment is transformed by humans into forms that are very beneficial for their activities.

An example to buttress this point is from the first person to understand that running a magnet via a copper wire could create an electric current was an English physicist named Michael Faraday. It was a truly remarkable finding. Magnets and copper wire coils are used in enormous power plants to create almost all of the electricity we use today. Therefore, harnessing human energy can do us more good than harm.

From

John Joe.

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The empirical formula of the ethyl acetate is  [tex]C_2O_{3.5}H_1[/tex]. and the molecular formula is  [tex]C_4O_7H_2[/tex].

The ethyl acetate contains carbon, oxygen, and hydrogen as follows:

carbon = 4.232 g

oxygen = 11.277 g

hydrogen = 0.204 g

The equivalent number of moles of each element:

C = 4.232/12 = 0.3527

O = 11.277/16 = 0.7048

H = 0.204/1 = 0.204

Divide through by the lowest number of mole:

C = 0.3527/0.204 = 2

O = 0.7048/0.204 = 3.5

H = 0.204/0.204 = 1

Thus, the empirical formula of the ethyl acetate is [tex]C_2O_{3.5}H_1[/tex].

[ [tex]C_2O_{3.5}H_1[/tex]]n = molecular formula

Empirical formula mass = (12x2) + (16x3.5) + (1x1)

                             = 81

n = molar mass/empirical formula mass

                   = 88/81

                   = 1

Thus, the molecular formula is [tex]C_4O_{7}H_2[/tex].

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Steps for writing net ionic equation:

1) Write the balanced molecular equation.

2) Write the states (s, l, g and aq) for the substances with the help of the solubility table.

3) Split electrolytes into ions (this is called the complete ionic equation)

4) Cross out all the spectator ions on both sides.

5) Write the remaing substances as the net ionic equation.

When  20.0mL of sulfuric acid   titrated with 22.47 mL of a 0.160 M Potassium hydroxide  solution, then the calculated molarity comes out to be 0.18M.

Titration is a technique by which we know the concentration of unknown solution using titration of this solution with solution whose concentration is known. To know the end point we use phenolphthalein as indicator. End point is a point where completion of reaction happen.

Mathematically,

moles or sulfuric acid   =moles of  potassium hydroxide solution

[tex]M_{1} V_{1} =M_{2} V_{2}[/tex]

[tex]M_{1}[/tex]= Molarity of sulfuric acid

[tex]V_{2}[/tex]= Volume of sulfuric acid

[tex]M_{2}[/tex]= Molarity of potassium hydroxide solution

[tex]V_{2}[/tex]= Volume of potassium hydroxide solution

Substituting all values

[tex]M_{1}[/tex]= 0.160 M ×22.47 mL)÷20.0- mL

    =0.18M

Thus the molarity if sulfuric acid  is 0.18M

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Answer:

Explanation:

Here,we want to get the volume of water that contains 250 mg of benzene

From the question,we have it that the percentage by mass of benzene in water is 4.5 * 10^-5%

This corresponds to the 250 mg (this is same as 250/1000 = 0.25 g)

Let us say the mass of the water that contains the benzene is x g

4.5 * 10^-5% = 0.25 g

100% = x g

To get x, we have it that:

We have to get the volume from this

Mathematically, volume will be mass divided by density (given as 1 g/mol)

Thus,we have the volume as:

Answer:

D. Matter

Explanation:

The definition of matter is any substance that has mass and takes up space by having volume

ANSWER

The mass of KI is 435.76 grams

EXPLANATION

Given that;

The volume of the solution is 3.5L

The concentration of the solution is 0.75M

Follow the steps below to find the number of moles of KI

Step 1; Write the molarity formula

Step 2; Find the mass of the solute using the formula below

Recall, that the molar mass of KI is 166.0028 g/mol

Therefore, the mass of KI is 435.76 grams

As the freezing point depression equation states,

ΔTf = kf.m.i ,

where kf depends on the solvent, m depends on the concentration and i depends on the particles, the only parameter that changes between the two scenarios presented is i, since it relates to the amount of particles resulted in the dissolution of the solute. While a covalent compound, such as the acetic acid, remains as one particle when it dissolves (i = 1), ionic compounds such as KF dissolves into more particles. Therefore, the i for KF is greater than 1, resulting in a bigger change in freezing temperature.

According to the information Abrasive mineral of the following is not among the types of mineral.

Minerals can be energetic, metallic, or non-metallic. Ferrous, non-ferrous, and precious minerals are subcategories of metallic minerals. Example of ferrous minerals: manganese and iron ore. iron is present in them.

A mineral is an inorganic element or compound that occurs in nature and has a recognizable chemical composition, crystal structure, and physical characteristics. Quartz, feldspar, mica, amphibole, olivine, and calcite are examples of common minerals.

The earth's crust contains minerals all over the world, although they are often present in such minute quantities that their extraction is usually not worthwhile. Minerals are only concentrated into deposits that are economically viable with the aid of specific geological processes. Only the locations where mineral deposits are present can be mined.

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The complete question is -

Which of the following is not among the types of mineral?

Answer:

F

Explanation:

The answer depends on if dipole induced - dipole forces count as a dipole-dipole force.

Since one of the molecules has a permanent dipole (SF4), all of the atoms will have a dipole-dipole force or at least a dipole-induced dipole force.
The answer should then be F if only one answer choice is allowed.

A and C are examples of molecule which will have dipole-induced dipole force.

Explanation:

The limiting reactant is the reactant that produces the lowest mass for the specific product.

According to the provided picture, the limiting reactant is:

If A van travels 2 kilometers due south, turns left, and then travels 1 kilometer. It takes a left turn again

and travels 2 kilometers. the displacement of the van is 1 kilometers.

Given,

A van travels 2 kilometers due south.

then turn left and travels 1 kilometer.

Then, the van takes left turn again and travels 2 kilometers.

As the displacement is the shortest distance traveled by the body. thus the displacement of the van is 1 kilometers.

The term "displacement" refers to a shift in an object's position. It is a vector quantity with a magnitude and direction. The symbol for it is an arrow pointing from the initial location to the ending place. For instance, if an object shifts from location A to position B, its position changes. Displacement is the term for this alteration in an object's position.

it is the shortest distance travelled by the body.

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Yes, a spider's environment influences how much chemical exposure they receive because urban regions have higher chemical concentrations than rural ones because more people reside there.

Spiders can be found in a variety of settings, including backyards, jungles, and deserts. Spiders that float ON the water include fishing spiders and others.

Therefore, Insects and other aquatic animals regularly interact with these substances. Many insects are hatched and raised in water, where they gradually absorb the medications. The toxins go through the food chain as predators eat the insects and pass them on.

For instance, spiders that live near rivers consume aquatic invertebrates and take in the from their prey, pharmaceuticals.

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The grams of white petrolatum should be mixed with 250g of 5% and 750g of 15% zinc oxide ointment to prepare a 10% ointment is

x = 250 g

This is further explained below.

Generally, the ratio of  mixtures

250g of 0.05 : 5*250 = 1250

Also

750g of 0.15 : 15*750

= 11250

Total= 250g + 750 g

Total= 1250 + 11250

Total= 12500

Remembering that and

x=250g + 750 g

x= 12.5%

A combination of ointments containing 5% and 15% contains 12.5% sulfur per 1000 g.

12.5% : 10 parts of a mixture containing 12.5%

0.10

Hence

0.00 : 2.5 parts of white petrolatum

[tex]\frac{10}{2.5}=\frac{4}{1} \\\\=\frac{1000}{x} \Rightarrow x \\\\\ =\frac{1000}{4}=250[/tex]

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Therefore, we must first determine whether oxalic acid is normal. Oxalic acid has two H atoms that it can lose in order to become acidic, hence its dihydrate has an n-factor of two.

When applied properly, oxalic acid is a dependable and efficient cleanser. In situations like buildings, boats, swimming pools, concrete driveways, sidewalks, iron machinery, wood decks, stairs, or trim, oxidizing acid can be used to remove rust and other tough stains.

If severe damage to the mouth, digestive system, or airway occurs, it may swiftly result in death if untreated. In addition to dangerous infections in the chest and abdomen, perforations in the esophagus and stomach can also result in death.

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The complete question is -

What is the Normality (Coo HCOOH 2H2O) of oxalic and dihydrate is dissolved in water and solution is made up to looms ?

The blank which are numbers that are found on the lower right hand side of the element symbol represents the number of atoms in that particular molecule or atom.

The smallest unit of matter that may be divided without producing electrically charged particles is the atom. It is also the smallest piece of substance with chemical element-like characteristics. As a result, the atom serves as the fundamental unit of chemistry.

Examine different electron arrangements in the electron shells that surround an atom's nucleus.

Examine different electron arrangements in the electron shells that surround an atom's nucleus.

Space makes up the majority of an atom. The rest is made up of a cloud of negatively charged electrons surrounding a positively charged nucleus made up of protons and neutrons. Compared to electrons, which are the lightest charged particles in nature, the nucleus is small and dense.

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Financial goals, current expenses, and income are the creative ways to spend your money.

A budget represents a calculating plan, typically financial but not always, for a specific time frame, typically one year or one month. Predicted sales and revenue amounts, resource quantities (such as time, costs, and expenses), environmental impacts (such as greenhouse gas emissions), other impacts, assets, liabilities, and cash flows are all possible inclusions in a budget.

Budgets are a measurable way for businesses, governments, families, and numerous other organisations to articulate their strategic plans of action.  In a budget, intended expenses are expressed together with suggestions for how to fund them. A budget can show a surplus of resources for later use or a deficit if expenses are greater than income as well as other resources. Financial goals, current expenses, and income are the creative ways to spend your money.

Therefore, financial goals, current expenses, and income are the creative ways to spend your money.

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Regular notation is alredy thereonly need to add two more 00 so you show 4 significant figures:

0.0004500

Scientific notation is:

The energy needed to boil 40 gram of ethanol is 8.01 x 10^3 calories, when heat of vapourisation of ethanol is 200.3 cal/g.

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Answer

A

Explanation

Alpha decay or α-decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle (helium nucleus) and thereby transforms or 'decays' into a different atomic nucleus, with a mass number that is reduced by four and an atomic number that is reduced by two.

Answer

n = 1.29 moles

Explanation

Given:

Pressure (P) = 1.22 atm

Volume (V) = 31.5 L

Temperature =89.5 C = 362.5 K

We know R = 0.082 L.atm/K.mol

Required: moles of the unknown gas

Solution:

Use the ideal gas law:

PV = nRT

n = PV/RT

n = (1.22 atm x 31.5 L)/(0.082 L.atm/K.mol x 362.5 K)

n = 1.29 moles

Iron([tex]II[/tex]) sulfate is required as the name consists of the ions,  a cation and an anion. Iron([tex]III[/tex]) sulfate, not iron([tex]III[/tex]) sulfide, must therefore be the term. E - [tex]Fe_{2} (SO_{4} )_{3} iron(III) sulfide[/tex] is therefore mismatched.

[tex]FeSO_{4}[/tex] is also known as iron([tex]II[/tex]) sulfate.

Due to the presence of the transition metal iron [tex]Fe[/tex] and the polyatomic ion sulfate, [tex]FeSO_{4}[/tex] is an ionic compound. If you are unsure of their names, you should consult a polyatomic ion chart and periodic table. According to naming conventions, we must first name the transition metal for this ionic compound (with the charge enclosed in roman numerals) before naming the polyatomic ion. Currently, we are aware of the names of the metal (iron) and polyatomic ion (sulfate), but we are unsure of the Fe atom's charge, which would complete the name. Let's determine it right away. We employ the criss-cross approach to forecast ionic compound chemical formulae. To obtain the subscripts in the chemical formula, this involves switching the ion charges.

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Answer

B

Explanation

At 0.25atm and 0 degrees celsius, water could exist as a liquid, as a solid, or as both. At this pressure and temperature, water can either melt or freeze.

A)Given:Mass of 1 mole of KOH=56.1 g

Then,number of moles in 14 g of KOH= 14/56.1=0.249 moles

This amount of KOH is present in 100 ml of solution. Since morality is defined as the number of moles of solute in 1000 ml (1 liter) of solution, we use the below direct proportionality to achieve the result: Moles of KOH in 100 ml solution =0.249 moles Moles of KOH in 1 ml solution = (0.249/100) moles

Then, moles of KOH in 1000 ml solution = (0.249/100) x 1000 = 2.49 moles 2.50 moles So, since there are 2.50 moles of KOH per 1000 ml of solution, the molarity of the solution is 2.50 M.

Hence,the concentration of Potassium hydroxide=2.50 M

B)Given:Mass of 1 mole of HCL=3.65 g

Then,number of moles in 14 g of HCL= 3.65/250= 0.0146 moles

This amount of HCL  is present in 100 ml of solution. Since morality is defined as the number of moles of solute in 1000 ml (1 liter) of solution, we use the below direct proportionality to achieve the result: Moles of HCL in 100 ml solution =0.0146 moles Moles of HCL in 1 ml solution = (0.0146/100) moles

Then, moles of HCL in 1000 ml solution = (0.0146/100) x 1000 = 1.46 moles. So, since there are 1.46 moles of HCL per 1000 ml of solution, the molarity of the solution is 1.46 M.

Hence,the concentration of hydrogen chloride=1.46 M

C)Given:Mass of 1 mole of Na2co3.10H2o =5.3 g

Then,number of moles in 14 g of Na2co3.10H2o= 5.3/500= 0.0106 moles

This amount of Na2co3.10H2o is present in 100 ml of solution. Since morality is defined as the number of moles of solute in 1000 ml (1 liter) of solution, we use the below direct proportionality to achieve the result: Moles of Na2co3.10H2o in 100 ml solution =0.0146 moles Moles of HCL in 1 ml solution = (0.0106/100) moles

Then, moles of Na2co3.10H2o in 1000 ml solution = (0.0106/100) x 1000 = 1.06 moles. So, since there are 1.06 moles of Na2co3.10H2o per 1000 ml of solution, the molarity of the solution is 1.06 M.

Hence,the concentration of sodium trioxocarbonate=1.06 M

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The force with which the man apply on the object is  19.96 N

According to Newton's second law of motion

        F = ma

where :

    F = Force ( ? )

   m = mass ( given 11 lbs )

   a = acceleration ( ? )

Using the formula,

       a = ( v - u ) / t  

 where :

   a = acceleration

   u = initial velocity ( is zero as its a stationary object)

   v = final velocity ( given 16 m/s)

   t = time ( 4 sec)

       a = ( 16 - 0 ) / 4

          = 4 m/s²

Converting mass to SI unit ( kg)

       1 lb = 0.454 kg

       11 lb = 11 × 0.454

               = 4.99 kg

 Substituting,

      F = m a

         = 4.99 × 4

         = 19.96 N

Thus we can conclude that the force which man apply on the object is           19.96 N

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The question requires us to write down the chemical equation for the combustion of methane, where 4.32 ng of this compound burns in excess oxygen. The question also requires us to calculate the amount of reactants and products at the end of the reaction and to classify the reaction.

When methane burns in the presence of oxygen, the combustion reaction of methane occurs and its equation can be written as:

This reaction is classified as a combustion reaction (letter g).

Since the amount of methane was provided by the question (4.32 ng) and the question mentions excess of oxygen, we can assume methane as the limiting reactant and use it to calculate the amount of products obtained.

First, we need to convert the mass given into the number of moles of methane using its molar mass. We'll also need the molar mass of CO2 and H2O further to answer the question completely.

The atomic masses that we'll use are:

C = 12.01 u

H = 1.01 u

O = 15.99 u

We calculate the molar masses considering the atomic mass and the number of atoms of each element in the molecules:

molar mass (CH4) = (1 * 12.01) + (4 * 1.01) = 16.05 g/mol

molar mass (CO2) = (1 * 12.01) + (2 * 15.99) = 43.99 g/mol

molar mass (H2O) = (2 * 1.01) + (1 * 15.99) = 18.01 g/mol

Now that we have the molar masses, we can use the molar mass of CH4 to calculate how many moles are there in 4.32 ng of this compound. Note that the mass is given in ng, which corresponds to 10^-9 g:

16.05 g CH4 -------------------- 1 mol

4.32 x 10^-9 g CH4 ---------- x

Solving for x, we have that 4.32 ng of CH4 corresponds to 2.69 x 10^-10 moles of CH4.

Next, we'll use the amount of moles of CH4 we calculated and the stoichiometric relation given by the chemical equation to calculate how many moles of CO2 and H2O would be produced:

1 mol CH4 -------------------------- 1 mol CO2

2.69 x 10^-10 mol CH4 -------- y

Solving for y, we have that 2.69 x 10^-10 moles of CO2 would be obtained from 4.32 ng of CH4.

1 mol CH4 -------------------------- 2 mol H2O

2.69 x 10^-10 mol CH4 -------- z

Solving for z, we have that 5.38 x 10^-10 moles of H2O would be obtained from 4.32 ng of CH4.

At last, we use the molar masses of CO2 and H2O, calculated previously, to convert the number of moles of these substances into their masses:

1 mol CO2 ------------------------------ 43.99 g CO2

2.69 x 10^-10 mol CO2 ------------ a

Solving for a, we have that the mass produced of CO2 is 1.18 x 10^-8 g or 11.8 ng.

1 mol H2O ------------------------------ 18.01 g H2O

5.38 x 10^-10 mol CO2 ------------ b

Solving for b, we have that the mass produced of H2O is 9.69 x 10^-9 g or 9.69 ng.

To summarize the answer, we can write:

- The balanced chemical reaction: CH4 + 2O2 -> CO2 + 2H2O

- The type of reaction: combustion reaction

- At the completion of reaction, we would have:

- Grams of methane: 0 g, since methane is the limiting reactant, it would be completely consumed.

- Grams of oxygen: it is not possible to affirm the amount of oxygen because the initial amount wasn't provided.

- Grams of carbon dioxide: 1.18 x 10^-8 g or 11.8 ng of carbon dioxide are produced.

- Grams of water vapor: 9.69 x 10^-9 g or 9.69 ng of water vapor are produced

According to the electronic configuration of  copper which is [Ar]3d¹⁰ 4s¹ it commonly forms  a cation with+1 charge and  it can exist  in two  charges that is, +1 and +2, however +1 charge of copper is stable .

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

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STEP-BY-STEP EXPLANATION:

Radium sulfide can be prepared by direct combination of the elements (radium and sulfur)

The reaction between radium and sulfur can be represented below as

Therefore, the chemical formula for Radium sulfide is RaS