how to do 4 please it is a quick question

Answer:

D. Matter

Explanation:

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

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.

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.

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

The heat of combustion of the substance is obtained as -6154 kJ/mol.

The heat of combustion is the heat that is evolved when one mole of sucrose is burnt in oxygen. Let us now try to find the heat of combustion of the substance.

Number of moles of sucrose = 1.151 grams /342.3 g/mol = 0.00336 moles

Heat capacity of the calorimeter = 4.900 kJ/°C

Temperature change = 26.63°C -  22.41°C = 4.22 °C

Now we can find the heat of combustion of the sucrose knowing that heat is evolved.

H = -(4.900 kJ/°C) * 4.22 °C/ 0.00336 moles

H = -6154 kJ/mol

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Answer:

Explanation:

Here, we want to get the number of moles needed to react

From the equation of reaction:

4 moles produced 6 moles of H2O

x moles will react to form 2 moles of H2O

To get the value of x, we have it that:

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.

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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1 quart = 946 mL is an example of unit conversion in volume.

The unit conversion of a substance is the process through which the unit of the substance is converted from one form to another.

The expression 100 cm/1 m is called a conversion factor, and it is used to formally change the unit of a quantity into another unit.

For example, converting the volume of a substance from one unit to another, we make use of conversion factor such as 1 L/1000 mL, 1 m³/1,000,000 cm³, etc.

There different units in the volume of a substance or liquid is measured and they include the following;

The unit of volume can be converted from one unit to another as shown in the given example.

1 quart = 946 mL

Thus, we can conclude that 1 quart = 946 mL is an example of unit conversion in volume, from quart to milliliters.

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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:

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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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 ?

Explanation:

The excess reactant is the reactant that is left over once the limiting reactant or reagent is consumed. We can also say that it is a reactant present in an amount in excess of that require to combine with all of the limiting reactant.

Answer: The reactant that is left over in a chemical reaction.

logarithm and power 10 are inverse operations

The answer is [OH-] = 10^-(pOH)

and, if pOH = 2.77

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

Mushroom use thermal energy to reproduce .

What is thermal energy?

thermal energy is a type of energy tha contained within a system that is responsible for its own tempreture . As we know heat is the flow of thermal energy thermal energy refers to the movement of molecules within an object or substance . Every object or substance has thermal energy .

Mushrooms are able to use thermal energy to reproduce by creating it convention currents, which are the  considered pockets. After the pockets are formed the currents disperse are  microscopic spores in the surrounding air. Due to the  spread, a large spore clouds are  created and becomes visible during the night.

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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.

We are required to calculate the molarity, given:

Volume = 150 mL = 0.150 L

mass of KOH = 25.0 g

Formular for molarity:

C = n/V

Before we can get C, we need to calculate n, the number of moles of KOH.

n = m/M where m is the mass and M is the molar mass

n = 25.0 g/56,1056 g/mol

n = 0.446 mol

Now we can calculate C, the molarity

C = 0.446 mol/0.150L

C = 2.97 mol/L or 2.97 M

The grains are heated by microwave radiation which heats the grains and gives off more heat to the surrounding grains.

Popcorn pops using conduction convection and radiation. Students will use the particle states of matter to model three types of heat transfer. Radiant energy is converted to heat energy when the popcorn kernels absorb microwaves. As a result, the grains heat up and burst. You can also make loose corn kernels in the microwave if you have the right popcorn supply.

Convection heating is a great way to make popcorn. The reason popcorn pops is that the wick is filled with water. When the core is heated hot enough, this water turns into steam. Due to the hard, almost non-porous shell steam has nowhere to escape and pressure builds up within the core.

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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

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:

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:

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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An adult human lungs can only hold a volume of up to 6.0 L of air when fully expanded. Suppose that at sea level where the pressure is 1.00 atm, a sky diver traps 3.0 L of air in her lungs and holds her breath before rapidly ascending to an altitude where the pressure drops to 0.46 atm. If she doesn't exhale, determine if her lungs will rupture at this high altitude, then complete the sentence:

At the higher altitudes, the gas volume will be increases, on higher altitudes pressure will decreases.

Thus ,  If she doesn't exhale, determine if her lungs will rupture at this high altitude, then complete the sentence: At the higher altitudes, the gas volume will be increases, on higher altitudes pressure will decreases.

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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?

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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Mass of potassium nitrate is needed to generate 215.0 L of gas, composed of 111.0 L of N₂ and 104.0 L of O₂ at 0.920 atm and 291 K, using these two reactions is 1186.75 g.

The reactions are :

2KNO₃ --->  2KNO₂  +  O₂

4KNO₂  ---->  2K₂O  + 3O₂  +  2N₂

Therefore,

4KNO₃  ---->  2K₂O  +   5O₂  +  2N₂

using the formula:

PV = nRT

moles of N₂ = PV / RT

P = 0.920 atm

T =291 K

R = 0.082 Latm/mol/k

moles of N₂ = 4.279 mol

moles of O₂ = (0.92 × 104) / 0.082 × 291

                   = 4.00 mol

from the equation .

moles of potassium nitrate to produce nitrogen = 2 × 4.279

                                                                                 = 8.55 mol

moles of nitrate tp produce oxygen = (4 / 5) × 4

                                                            = 3.2 mol

total moles of nitrate = 8.55 mol + 3.2 mol

                                   = 11.75 mol

mass of potassium nitrate = number of moles × molar mass

                                           = 11.75 × 101

                                           = 1186.75 g

Thus, Mass of potassium nitrate is needed to generate 215.0 L of gas, composed of 111.0 L of N₂ and 104.0 L of O₂ at 0.920 atm and 291 K, using these two reactions is 1186.75 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.

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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An ioc occurs when KRI (key risk indicator) metric exceeds its normal bounds.

Key Risk Indicators (KRIs) are vital for predicting unfavourable events that may have a negative effect on companies. They keep an eye on changes in risk exposure levels and help provide the early warning signals that let businesses disclose concerns, avert catastrophes, and properly mitigate them. a metric that measures the maximum and lower limits of particular indications of typical network activity.

A few indicators are the total number of network logs per second, the number of unsuccessful remote login attempts, network bandwidth, and outgoing email traffic. One of these that deviates from its expected range may be a sign of compromise (IOC). For a major risk indicator to be measured and be effective over time, it must be repeatable. They give a mechanism to measure and keep track of each danger.

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