Imma give 35 points cus I really need it today please.

Answer:

general formula: Q=mHv, 2.83=m(2260), 2260/1000=2.26 , 2.83/2.26=1.25 kJ

Explanation:

Answer:

use socratic it helps me get A+

Answer:

The energy of photon is 20.22×10⁻¹⁷ J

Explanation:

Given data:

Frequency of photon = 3.05×10¹⁷ Hz

Energy of photon = ?

Solution:

Formula:

E = hf

h = planck's constant = 6.63×10⁻³⁴ Js

Now we will put the values in formula.

E =   6.63×10⁻³⁴ Js × 3.05×10¹⁷ Hz

    Hz = s⁻¹

E = 20.22×10⁻¹⁷ J

Thus, the energy of photon is 20.22×10⁻¹⁷ J

Answer:

C.

Explanation:

The same amount of force reacts to you

Answer:

[tex]CaCO_3(s)\rightarrow CaO(s)+CO_2(g)[/tex]

Explanation:

Hello!

In this case, when solid calcium carbonate, CaCO3 (s), is decomposed by the action of thermal energy (heat), solid calcium oxide, CaO (s) and carbon dioxide gas, CO2 (g) are yielded via the following reaction:

[tex]CaCO_3\rightarrow CaO+CO_2[/tex]

However, since calcium carbonate is solid as well as calcium oxide and carbon dioxide is given off as a gas, we write:

[tex]CaCO_3(s)\rightarrow CaO(s)+CO_2(g)[/tex]

Which also balanced.

Best regards!

Answer:

[tex]\Delta U=-94.0J[/tex]

Explanation:

Hello!

In this case, since the first law of thermodynamics allows us to understand how the energy behaves when heat and work are involved during a process, we can mathematically define it as:

[tex]Q-W=\Delta U[/tex]

Whereas Q is the heat added to the system, W the work done by the system and ΔU the change in the internal energy, we can notice that since 97.0 J of work are done on the system it would be negative and the given off heat is also heat due to the used convention; therefore the change in its internal energy turns out:

[tex]-191.0J-(-97.0J)=\Delta U\\\\\Delta U=-94.0J[/tex]

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Answer: The amount of matter in a particle or object.

Answer:

A. Light waves are electromagnetic waves and sound waves are mechanical waves.

Explanation:

The experiment is clear proof that light waves are electromagnetic waves and that sound waves are mechanical waves.

Answer:

The equation showing the dissolving of solid ammonium phosphate in water is: (NH4)3 PO4 (s) → 3NH4 +1 (aq) + PO4 -3 (aq).

Explanation:

Answer:

2.33g of NaHCO3

Explanation:

The balanced equation of the reaction is;

2NaHCO3  + 2HA --> 2CO2  +  2H2O + 2NaA

From the reaction above;

2 mol of NaHCO3 produces 2 mol of CO2

using mass = number of moles * molar mass

Mass = 2 * 84  = 164g of NaHCO3

Mass of CO2 = 2 * 44 = 88g of CO2

This means 164g of NaHCO3 produced 88g of CO2

How many grams of NaHCO3 would then produce 1.25g of CO2?

164 = 88

x = 1.25

upon solving for x;

x = 2.33g

The reaction of sodium bicarbonate with  acid produces equivalent moles of carbon dioxide. The mass of sodium bicarbonate in the given reaction is 2.352 grams.

The stoichiometric law is used for the determination of the moles of each product or reactant, from the stoichiometric coefficient of the balanced chemical equation.

The balanced chemical equation for the reaction of sodium bicarbonate with HA acid is :

[tex]\rm 2\;NaHCO_2\;+\;2\;HA\;\rightarrow\;2\;CO_2\;+\;2\;H_2O\;+\;2\;NaA[/tex]

From the stoichiometric law, 2 moles of carbon dioxide is produced from 2 moles of sodium bicarbonate.

The moles of carbon dioxide in 1.25 grams is:

[tex]\rm Moles=\dfrac{mass}{molar\;mass}\\\\ Moles\;CO_2=\dfrac{1.25\;g}{44\;g/mol} \\\\Moles\;CO_2=0.028\;mol[/tex]

From the stoichiometric law, the moles of sodium bicarbonate required is:

[tex]\rm 2\;mol\;CO_2=2\;mol\;NaHCO_3\\\\0.028\;mol\;CO_2=\dfrac{2\;mol}{2\;mol}\;\times\;0.028\;mol\;NaHCO_3\\\\ 0.028\;mol\;CO_2=0.028\;mol\;NaHCO_3[/tex]

The mass of sodium bicarbonate required is given as:

[tex]\rm Mass=Moles\;\times\;Molar\;mass\\Mass\;NaHCO_3=0.028\;mol\;\times\;84\;g/mol\\Mass\;NaHCO_3=2.352\;g[/tex]

The mass of sodium bicarbonate in the reaction is 2.352 grams.

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According to the placement of elements in the periodic table and the atomic structure, protons from atom on right will attract electrons from atom on left.

Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.

It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.

Elements present in the same group have same number of valence electrons and hence have similar properties while elements present in the same period show gradual variation in properties due to addition of one electron for each successive element in a period.

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Answer:

Increases

Explanation:

As ice melts into liquid water, the kinetic energy of the particles increases.

This is because to melt ices, heat energy is supplied.

Answer:

Explanation:

1 x 10²³ molecules of methane

6.02 x 10²³ molecules of methane = 1 mole of methane

10²³ molecules of methane = 1 / 6.02 moles of methane

= .166 moles .

The moles of methane that contain 1 [tex]\rm \times\;10^2^3[/tex] molecule have been 0.166 mol.

The number of molecules of a compound can be given by the Avagadro number. The number of molecules in a mole of the compound has been equal to the Avagadro number. The Avagadro number has been constant with a value of 6.023 [tex]\rm \times\;10^2^3[/tex].

6.023 [tex]\rm \times\;10^2^3[/tex] molecules = 1 mole.

The given molecules of methane have been = 1 [tex]\rm \times\;10^2^3[/tex] .

The moles of given molecules will be:

6.023 [tex]\rm \times\;10^2^3[/tex] molecules = 1 mole.

1 [tex]\rm \times\;10^2^3[/tex] molecules = [tex]\rm \dfrac{1}{6.023\;\times\;10^2^3}\;\times\;1.0\;\times\;10^2^3[/tex] moles.

1 [tex]\rm \times\;10^2^3[/tex] molecules = 0.166 moles.

The moles of methane that contain 1 [tex]\rm \times\;10^2^3[/tex] molecule have been 0.166 mol.

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Answer:

B

Explanation:

Answer: B the biosphere it is a animal and a living thing

Explanation:

Answer:

B. The first fraction contains both the carboxylic acid and the alkyne.

Explanation:

Carboxylic acids dissolve in both polar and non-polar organic solvents hence they can dissolve in acetone along with the alkyne.

The correct sequence of adding eluting solvents is reversed,  would have been the addition of hexane first in order to elute the alkyne selectively. The acetone may now be subsequently added to elute the carboxylic acid.

If this order the carboxylic acid and alkyne are eluted simultaneously.

Answer:

This dilution problem uses the equation

M

a

V

a

=

M

b

V

b

M

a

= 6.77M - the initial molarity (concentration)

V

a

= 15.00 mL - the initial volume

M

b

= 1.50 M - the desired molarity (concentration)

V

b

= (15.00 + x mL) - the volume of the desired solution

(6.77 M) (15.00 mL) = (1.50 M)(15.00 mL + x )

101.55 M mL= 22.5 M mL + 1.50x M

101.55 M mL - 22.5 M mL = 1.50x M

79.05 M mL = 1.50 M

79.05 M mL / 1.50 M = x

52.7 mL = x

59.7 mL needs to be added to the original 15.00 mL solution in order to dilute it from 6.77 M to 1.50 M.

Explanation:

Answer: The equation is fairly simple. The number of atoms of ANY substance in a volume is: # of atoms = N * (density) * volume / (Molecular Weight). N is a constant called Avogadro's number and its equal to 6.022*1023 atoms/mole.

Explanation:

Answer:

[tex]m_{CaCO_3}=0.465g[/tex]

Explanation:

Hello!

In this case, since the reaction between two aqueous solutions may turn out in the production of a solid precipitate, for potassium carbonate and calcium chloride, calcium carbonate is precipitated out as shown below:

[tex]CaCl_2(aq)+K_2CO_3(aq)\rightarrow 2KCl(aq)+CaCO_3(s)[/tex]

Now, since the two reactants are in a 1:1 mole ratio, we infer they react in the same proportion, thus we compute the reacting moles, considering the used volumes of those molar solutions:

[tex]n_{K_2CO_3}=0.0152L*0.306mol/L=0.00465mol\\\\n_{CaCl_2}=0.0170*0.295mol/L=0.00502mol[/tex]

Thus, since just 0.00465 mol out of 0.00502 moles of calcium chloride are consumed, the potassium carbonate is the limiting reactant, therefore the mass of yielded calcium carbonate (molar mass = 100.09 g/mol) is:

[tex]m_{CaCO_3}=0.00465molK_2CO_3*\frac{1molCaCO_3}{1molK_2CO_3} *\frac{100.09gCaCO_3}{1molCaCO_3}\\\\m_{CaCO_3}=0.465g[/tex]

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Answer:t pans

Explanation:it’s the cool thing

Explanation:

using Boyles law: which shows the relationship between pressure and volume, when temperature Is kept constant

P1V1 = P2V2

2 x 7.2 = 0.5 x V2

14.4 = 0.5 x V2

V2 = 14.4/0.5 = 28.8 L

Hence the new size of the balloon in litres is 28.8

Answer:

subatomic particles are actually small than atoms

Yes, particles such as protons, neutrons, and electrons that make up the atom are smaller than atoms.

Answer:

1.86% Na₂CO₃

Explanation:

The additional volume that is required to reach endpoint with methyl orange indicator is due the presence of carbonate (Calculated as sodium carbonate). The reaction is:

Na₂CO₃ + 2HCl → H₂O + CO₂ + 2NaCl

Thus, we need to obtain moles of HCl and, using the reaction, solve for moles of sodium carbonate, its mass and percentage using molar mass of Na₂CO₃: 106g/mol.

Moles HCl:

0.700mL = 0.700x10⁻³L * (0.100mol / L) = 7.00x10⁻⁵moles HCl

Moles Na₂CO₃:

7.00x10⁻⁵moles HCl * (1mol Na₂CO₃ / 2 mol HCl) = 3.5x10⁻⁵ moles Na₂CO₃

Mass:

3.5x10⁻⁵ moles Na₂CO₃ * (106g / mol) = 0.00371g Na₂CO₃

Percentage:

0.00371g Na₂CO₃ / 0.200g * 100 =

Hydrogen atoms are in a molecule of table sugar (C₁₂H₂₂O₁₁) is 22

An atom is a particle of matter that uniquely defines a chemical element and in the table sugar molecule the formula is C₁₂H₂₂O₁₁ then the hydrogen atoms are present in the molecule is 22 and it is used for the adding sweetness to your coffee and baking and used as the food manufacture in various food and drink products due to its unique properties that add to the appearance

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Answer:

Yes

Explanation:

Answer:

It would be B

Explanation:

20 B203(s) + 12180 HF(l) = 4060 BF3(g) + 609 H20(l)

Answer:

3. d. Mg 4. a. Photoelectric effect 10. c. 2 11. b. 3s^2 3p^5

Explanation:

Answer: atomic mass of cl = 35.5 amu.

molar mass of ccl4 = (12) +4 (35.5)

= 12 + 142

= 154 amu.

mass of ccl4 = 385 g

no. of moles present = 385 / 154 = 2.5 mole

so, 2.5 mole of ccl4 is present in 385 grams .

Explanation:

In chemistry, the formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together.

Using the chemical formula of the compound and the periodic table of elements, we can add up the atomic weights and calculate molecular weight of the substance.

If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom (or group of atoms) in the formula by the formula weight and multiplying by 100.

The atomic weights used on this site come from NIST, the National Institute of Standards and Technology. We use the most common isotopes. This is how to calculate molar mass (average molecular weight), which is based on isotropically weighted averages. This is not the same as molecular mass, which is the mass of a single molecule of well-defined isotopes. For bulk stoichiometric calculations, we are usually determining molar mass, which may also be called standard atomic weight or average atomic mass.

A common request on this site is to convert grams to moles. To complete this calculation, you have to know what substance you are trying to convert. The reason is that the molar mass of the substance affects the conversion. This site explains how to find molar mass.

Formula weights are especially useful in determining the relative weights of reagents and products in a chemical reaction. These relative weights computed from the chemical equation are sometimes called equation weights.

Finding molar mass starts with units of grams per mole (g/mol). When calculating molecular weight of a chemical compound, it tells us how many grams are in one mole of that substance. The formula weight is simply the weight in atomic mass