what is the final temperature of an 18.0 g aluminum sample if it is initially at 22.0 C and it absorbs 48.0 calories of heat energy? Note: The specific heat value for aluminum is 0.210 cal/g C.

Answer:

Synthesis reaction

Explanation:

In synthesis reactions, two or more atoms/molecules combine to form a larger molecule.

These reactions follow the general structure: A + B <-----> AB.

To have only two significant figures we must have  to add a decimal point and two zeros.

The term significant figures refers to the figures that we could assign a place value. These are the figures that could be assigned a place in a string of digits. The nonzero values to which it is possible that we could give a place can be called a significant figure.

Having established that, we can see that the number 52 has two significant figures. The number 5.209 has three significant figures. If we want the value 52 to retain having only two significant figures then we have to add a decimal point and two zeros.

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Li lose one electron to acquire an electronic configuration. I must accept one electron, N accept three electron and Al lose three electron to acquire noble gas electronic configuration.

For Li,

Li belongs to first group of the periodic table and have 3 as atomic number. So, it lose one electron to acquire stable electronic configuration like as Helium.

For I,

I belongs to 17th group of the periodic table and have 53 as atomic number. So, it accept one electron to acquire stable electronic configuration like as Xenon.

For N,

N belongs to 15th group of the periodic table and have 7 as atomic number. So, it gain three electron to acquire stable electronic configuration like as Neon.

For Al,

Al belongs to 3rd group of the periodic table and have 13 as atomic number. So, it lose three electron to acquire stable electronic configuration like as Neon.

Thus, we concluded that Li lose one electron to acquire an electronic configuration. I must accept one electron, N accept three electron and Al lose three electron to acquire noble gas electronic configuration.

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The body's muscles become increasingly paralyzed as a result of tetrodotoxin's interference with the signaling process from nerves to muscles. Toxic exposure to tetrodotoxin may be lethal.

Scrub all right, had to drink a poisonous substances that paralyzes body resulting in death.

Tetrodotoxin (TTX), a neurotoxin, is extremely poisonous.

Tetrodotoxin is a sodium channel blocker. It stops neurons from firing action potentials by clinging to the voltage-gated sodium channels in nerve cell membranes and obstructing sodium ions from entering the neuron, which are crucial for an action potential's rising phase.

Due to the neurological system's inability to communicate, muscles are unable to contract in response to nerve inputs. It works by selectively blocking sodium channels.

The majority of its occurrences are in the livers and sex organs of several fish species, such as puffer fish, globefish, and toadfish (order Tetraodontiformes) (gonads).

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The equilibrium constant is 0.026.

Let us recall that the equilibrium constant is a number that shows us the extent to which reactants are converted into products. In other words, a large positive value of the equilibrium constant indicates that most of the reactants have been converted into products.

Initial concentration of A =  0.880 mol /3.00 L = 0.29 M

Equilibrium concentration of C = 0.150 mol /3.00 L = 0.05 M

We can set up the ICE table thus;

        2A(aq)   ⇄   2B(aq)  +   C(aq)

I      0.29 M         0                  0

C       -2x               +2x            +x

E   0.29 - 2x         2x                0.05 M

Where

x = 0.05

At equilibrium;

[A] =    0.29 - 2(0.05 ) = 0.19 M

[B] = 2(0.05) = 0.1 M

[C] = 0.05 M

K = [B] [C] /[A]

K = 0.1 * 0.05/ 0.19

K = 0.026

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Answer:

28.6 grams BaF₂

Explanation:

To find the amount of BaF₂ in grams, you need to multiply the given value (moles) by the molar mass. The molar mass is a ratio which describes the mass (g) of BaF₂ per every 1 mole. It is important to arrange the ratio in a way that allows for the cancellation of units (moles should be in the denominator).

Molar Mass (BaF₂): 175.34 g/mol

0.163 moles BaF₂          175.34 grams
----------------------------  x  -----------------------  =  28.58042 = 28.6 grams BaF₂
                                            1 mole

Sea level may rise as a result of the expansion of seawater and the melting of land-based ice due to a warming environment.

The sea level is the fundamental level for calculating height and depth on Earth. Since the ocean is one continuous body of water, its surface tends to seek a constant level. The sea surface is not actually level due to winds, currents, river discharges, fluctuations in gravity, and temperature.

People are impacted by sea level changes through flooding, the inability of rivers to empty into the ocean due to the sea being too high, and the surge of seawater onto the land during storms. Our drinking water and the ability to cultivate crops could be harmed if sea water gets into farms and reservoirs.

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E. The  oxidation number of chlorine with 14 electron is written as 17, 37 CL⁺³.

Oxidation number of an atom/ion is the number of electrons an atom/ion that the molecule has either gained or lost compared to the neutral atom.

Chlorine is a non metal with atomic number of 17 (17 electron, and 17 proton).

Chlorine also has an oxidation number of -1.

When the number of electron of the chlorine has been reduced to 14, it implies that the chlorine ion has been reduced by losing 3 electrons.

The oxidation number of chlorine with 14 electron is written as follows;

= CL (14) = 17 CL⁺³

mass number = 17 + 20 = 37

= 17, 37 CL⁺³

Thus, the  oxidation number of chlorine with 14 electron is written as 17, 37 CL⁺³.

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The theoretical yields in each case are;

1) 13.64 g

2)  5.82 g

3) 0.92 g

We know that the stoichiometry of the reaction is the tool that we could use to obtain the parameters that has to do with a given reaction. We have the reaction; [tex]Ti(s)+2F_{2}(g)------- > TiF_{4} (s)[/tex]

1) Number of moles of Ti = 4.0 g/48 g/mol = 0.08 moles

Number of moles of [tex]F_{2}[/tex] =  4.0 g/38 g/mol = 0.11 moles

If 1 mole of Ti reacts with 2 moles of [tex]F_{2}[/tex]

0.08 moles reacts with 0.08 moles *  2 moles/1 mole

= 0.16 moles

[tex]F_{2}[/tex] is the limiting reactant

Mass of [tex]TiF_{4}[/tex]= 0.11 moles * 124 g/mol = 13.64 g

2)  Number of moles of Ti = 2.2 g /48 g/mol = 0.045 moles

Number of moles of [tex]F_{2}[/tex]=  1.8 g/38 g/mol = 0.047 moles

If 1 mole of Ti reacts with 2 moles of [tex]F_{2}[/tex]

0.045 moles of Ti reacts with 0.045 moles *  2 moles/1 mole

= 0.09 moles

[tex]F_{2}[/tex] is the limiting reactant

Mass of TiF4 = 0.047 moles * 124 g/mol = 5.82 g

3) Number of moles of Ti = 0.225 g/48 g/mol = 0.0047 moles

Number of moles of [tex]F_{2}[/tex] = 0.283 g/38 g/mol =  0.0074  moles

If 1 mole of Ti reacts with 2 moles of [tex]F_{2}[/tex]

0.0047 moles of Ti reacts with  0.0047 moles *  2 moles/1 mole

=0.0094 moles

[tex]F_{2}[/tex] is the limiting reactant

Mass of [tex]TiF_{4}[/tex]= 0.0074  moles * 124 g/mol = 0.92 g

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The mass of ZrCl₂ needed to prepare the solution, given the data is 30.98 g

We'll begin by obtaining the mole of ZrCl₂. This can be obatined as follow:

Mole = Molarity x Volume

Mole of ZrCl₂ = 1.25 × 0.153

Mole of ZrCl₂ = 0.191 mole

We can obtain the mass of ZrCl₂ needed to prepare the solution as follo:

Mass = mole × molar mass

Mass of ZrCl₂ = 0.191 × 162.22

Mass of ZrCl₂ = 30.98 g

Thus, the mass of ZrCl₂ needed to prepare the solution is 30.98 g

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The number of atoms of nitrogen in an 80.0 g sample of dinitrogen tetroxide (N₂O4) is 1.047 * 10²⁴ atoms.

The number of nitrogen atoms in an 80.0 g sample of dinitrogen tetroxide (N₂O4) is calculated as follows:

Molar mass of N₂O4 = 92 g/mol

Moles of N₂O4 in 80.0 g sample = 80/92

Moles of N₂O4 in 80.0 g sample =0.87 moles

Moles of nitrogen in the sample = 0.87 * 2

Moles of nitrogen in the sample = 1.74 moles

1 mole of nitrogen contains 6.0 * 10²³ atoms

Number of atoms of nitrogen = 1.74 * 6.0 * 10²³ atoms

Number of atoms of nitrogen = 1.047 * 10²⁴ atoms

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Molar mass is an intensive property of a sample of water.

The molar mass of a certain chemical entity is its mass per unit quantity (symbol M, SI unit kgmol1). Always identify the chemical in question in accordance with the definition of the mole. A substance's molar mass is the volume of the material that contains one mole of the substance. Its basic definition is the weight of a single mole of a substance. The atomic mass of each substance is multiplied by the subscript of that element in the chemical formula to determine the molar mass.

One mole of a specific compound or material has a mass of 1 molar. We are aware that the number of moles in a compound (n) can be expressed as the ratio of the compound's  given mass to its molar mass. This is measured in g mol1, the standard unit. However, the SI unit, kg mol 1, is quite uncommon. The amount of particles in 1 mole of the substance is equal to the number of atoms present in 12g of the 12C isotope.

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5.845 mg of table salt provides the upper safe limit  in the recommended daily requirement of sodium.

Molar mass of common table salt that is sodium chloride is         23.0+35.5=58.5 g/mole which is the addition of molar masses of sodium and chlorine,the constituents of sodium chloride.

As the common table salt is 39.3% sodium by mass therefore it has 23.01975 g or 23019.75 mg of sodium.

                      39.3/100×58.5=23019.75

As 58.5 g of sodium chloride has 23.019 g of sodium therefore 2.3 g of sodium is present in 5.845 g, which is 5.845×10[tex]^-3[/tex]mg.

                 2.3×58.5/23.019=5.845 mg.

Mass percent of any compound is usually calculated as mass of the compound divided by it's total mass and then multiplied by hundred.It is a way of expressing concentration of a component.It describes how much solute is present in 100 grams of solution.

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The volume of the palladium is 103.3 cubic centimeters.

The term density has to do with the ratio of the mass to the volume of a substance. We can see here that the density of the palladium has been given as 12.1 g/cm3. However, the mass of the substance has been given in ounces.

We know that;

1 ounce = 28.35 grams

44.1 ounces = 44.1 ounces  * 28.35 grams/1 ounce

= 1250.23 g

Density = mass/volume

volume = mass/Density

volume = 1250.23 g/12.1 g/cm3

volume = 103.3 cubic centimeters

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its correct

Based on the specific gravity of granite, the weight density of granite is 174.72 lbs/ft³.

The specific gravity of a substance is the ratio of the density of the given substance to that of the ratio of a reference substance usually water.

Specific gravity is also known as relative density of that substance.

Specific gravity is dimensionless since it is the ratio of two similar quantities.

Considering the given data:

The specific gravity of granite is 2.80.

This means that the ratio of the weight density of granite and that of water is 2.80.

The weight density of water = 62.4 lbs/ft³

The weight density of granite = ?

2.80 = weight density of granite/ weight density of water

The weight density of granite = 2.80 * weight density of water

The weight density of granite = 2.80 * 62.4 lbs/ft³

The weight density of granite = 174.72 lbs/ft³

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If 7.50 mol of NH₃ and 8.15 mol of O₂ react in the following reaction. The number of moles of H₂O that will be formed is 9.84 moles.

The mole is a SI unit of measurement that is used to calculate the quantity of any substance.

Using the molar coefficients in the balanced equation, 6 moles of water are formed for every 4 moles of NH₃.

6 moles of water are formed for every 5 moles of O₂.

So (7.5 moles NH₃)(6 moles H₂O)/4 moles NH₃) = 11.25 moles water

For (8.20 moles O₂) / (6 moles H₂O)(5 moles O₂) = 9.84 moles H₂O.  

So O₂ is the limiting reagent, and we can only make as much product as allowed by the limiting reagent.

Thus, the number of moles is 9.84 moles of water.

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Answer:

same number of protons but different number of neutrons.

Answer:

Mass of phosphorus = (435kg)(0.01) = 0.45 kg

A sample of 25.0-g pure iron at the 85 °C is dropped into 75 g of water at 20°C.  22.25 °C is the final temperature of the water-iron mixture.

The specific heat equation is represented as

Q = mcΔT

where,

Q = heat energy in Joules

m = mass of substance

c = specific heat

ΔT = change in temperature in K

For iron given that

m = 25 g

c = 0.45 J/g°C

T₁ = 85°C

Now by putting the values in the above formula then we get

Q₁ = mcΔT

    = 25 × 0.45 × (T₂ - 85)

    = 11.25 × (T₂ - 85)

For water given that

m = 75 g

c = 4.184 J/g°C

T₁ = 20°C

Now,

Q₂ = mcΔT

     = 75  × 4.184 × (T₂ - 20)

     = 313.8 × (T₂ - 20)

Now,

Heat is generated by the iron = Heat is gained by the water.

Q₁ = -Q₂

11.25 × (T₂ - 85) = - 313.8 × (T₂ - 20)

325.05 T₂ = 7232.25

T₂ = 22.25 °C

22.25 °C is the final temperature of the water-iron mixture.

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The net ionic equation of potassium hydroxide and perchloric acid combined in aqueous solutions is

H⁺ + OH⁺ → H₂O

Step 1: Complete the equation, write the correct chemical formula for each compound both in reactant and product  

Step 2: Separate the compounds in ionic form.

Step 3: Stike out the common element in the product and the reactant side.

Demonstration: KOH (aq) + HCLO₄ (aq) → KCLO₄(aq) + H₂O(lq)

Total ionic equation: K⁺ + OH⁻ + H⁺ + CLO₄ → K⁺ + CLO₄ + H₂O

Net ionic equation: H⁺ + OH⁻ → H₂O

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The facts you find in reference source that support your data in an experiment​ is known to be called research.

Research is known to be a term that is defined as as  a kind of "creative and methodical form of activity done to improve the body of knowledge.

It entails the objective gathering, organizing, and analysis of data in order to improve comprehension of a subject or issue.

The Research is described as the thoughtful analysis of studies pertaining to a certain issue or problem utilizing scientific methodologies.

Therefore, since Research is a methodical inquiry, one can say that he facts that you find in reference source that support your data in an experiment​ is known to be called research.

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The interdependent relationship between advances in technology and scientific discoveries has enhanced our understanding of the universe. schooling, merchandising, and different multidisciplinary efforts by way of fostering higher information about the multidimensional nature of research.

Development in technological know-how and technology studies seeks to improve the techniques of technology and technology studies, Clinical expertise is used to create new technologies. New technology regularly allows scientists to explore nature in distinct ways and make new discoveries.

Technological know-how is the have a look at the natural world through a scientific approach i.e. collecting facts via a systematic procedure. And era is in which we observe science to create gadgets that can solve issues and perform distinct responsibilities. technology is literally the utility of science.

Society drives technological improvements and scientific inquiry. technology offers us a perception of what form of technology we should doubtlessly create and a way to create them, even as technology allows us to behave in addition to medical studies.

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Answer:

The moles of ammonia present will be "0.274 moles".

Molar mass:

A particular element's molar mass would be the mass of either the material that contains 1 mole of material. It should be the weight of such mole of something in basic words.

To determine the molar mass, multiply the atomic mass per each substance by the component's subscript throughout the chemical equation.

Given:

Weight in grams, w = 4.652 g

Molar mass, m = 17.030 g/mol

We know,

→ Number \ of \ moles (n)= \frac{Weight(w)}{Molar \ mass(m)}Number of moles(n)=

Molar mass(m)

Weight(w)

By substituting the values,

n = \frac{4.652}{17.030}n=

17.030

4.652

= 0.274=0.274 moles

Thus the response above is right

Answer:

B. is false

Explanation:

-there is no cure for hsv,

-herpes simplex I does affect the face as a cold sore, and herpes simplex II does affect the genitals

- a symptom of herpes can be flu like symptoms, everyone is different, some people don't even have any symptoms at all