Write the formula of calcium oxide

Answer:

When a substance is heated ,the kinetic energy of its molecules also increase.

Explanation:

K.E is directly proportional to T

Answer: fixed shape and volume

Explanation:

i took the quiz so its right

Explanation:

divide the weight in grams by the atomic mass from the periodic table, then multiply the result by Avogadro's number..

Hope this works!!

Answer:

b the physical components

The percent purity of your experimental sample is 97.3 %

The percentage purity % = impure value/pure value × 100 %.

Actual value of molar extinction coefficient = impure value = 8171 L/mol-cm, pure value = literature value = 8400 L/mol-cm.

Substituting the values of the variables into the equation, we have

% purity = 8171 L/mol-cm/8400 L/mol-cm ×  100 %

% purity = 0.9727 × 100 %

% purity =  97.27 %

% purity ≅  97.3 %

The percent purity of your experimental sample is 97.3 %

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Answer:

16g of oxygen reacts with 2 g of hydrogen to form 18g of Water

Answer:

When you make the electronegativities of A(Positive partial charge) and C (Negative Partial charge) less and have B with a strong electronegativity to create a very strong molecular dipole. ... Both molecules possess strong molecular dipoles.

Answer:

2CHCl3 + 5/2 O2 => 2CO2 + H20 + 3Cl2

Explanation:

Left Hand Side(LHS)

We have CHCl3 and O2

Right Hand Side(RHS)

We have CO2, H2O and Cl2

Balancing

To make sure that they have same values, put 2 before CHCl3 giving 2CHCl3 and 3 on Cl2(RHS) for chlorine gas giving 3Cl2

H2O remains the same

Before CO2 put 2 giving 2CO2

To make sure that oxygen is balanced put 5/2 before it. This gives 5/2 O2 (2 cancels out don't worry)

Combining all;

2CHCl3 + 5/2 O2 => 2CO2 + H20 + 3Cl2

I hope this helps. Have a nice studies.

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The compound cobalt(II)oxide is an ionic compound.

Hence, the fact that cobalt II oxide is comprised of a cation and an anion means that it us an ionic compound.

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Based on the balanced equation, the mole ratio of Iron to Sulphur is 8 to 1.

This means that for every mole of sulfur, 8 moles of iron is needed for the reaction.

∴ since the moles of Sulfur = 8.49 moles

                 ⇒ moles of Iron = 8.49 moles × 8

                                            = 67.92 moles

Answer:

up to 120 minutes to digest water and rehydrate your body

Answer:

410.196 J/[kg*°C].

Explanation:

1) the equation of the energy is: E=c*m*(t₂-t₁), where E - energy (523 J), c - unknown specific heat of copper, m - mass of this copper [kg], t₂ - the final temperature, t₁ - initial temerature;

2) the specific heat of copper is:

[tex]c=\frac{E}{m*(t_2-t_1)}; \ => \ c=\frac{523}{0.085*(45-30)}=\frac{523}{1.275}=410.196[\frac{J}{kg*C}].[/tex]

Answer:

In simple terms, the endothermic reactions absorb energy from the surrounding that is in the form of heat. On the other hand, an exothermic reaction releases energy into the surrounding of the system. A popular example of an endothermic chemical reaction is photosynthesis.

(i searched in g o o gle)

Taking into account the definition of calorimetry, the change in temperature of a 5.0 g sample of water that loses 1800J of heat energy is 86.12 C.

In first place, calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is the amount of heat that a body can receive or give up without affecting its molecular structure. If the molecular structure does not change, the state (solid, liquid, gaseous) does not change. Since the molecular structure does not change, a change in temperature is observed.

In other words, sensible heat is the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

So, the equation that allows to calculate heat exchanges is:

Q = c× m× ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case, you know:

Replacing in the expression to calculate heat exchanges:

1800 J= 4.18[tex]\frac{J}{gC}[/tex]× 5 g× ΔT

Solving:

1800 J ÷ (4.18[tex]\frac{J}{gC}[/tex]× 5 g)= ΔT

ΔT= 86.12 C

In summary, the change in temperature of a 5.0 g sample of water that loses 1800J of heat energy is 86.12 C.

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noooooooooooooooooooooo

Answer: A. B.

Explanation:

Answer:

3Mg+2FeCl3------------3MgCl2+ 3Fe

Answer:

im only good at math

Explanation:

Answer:

it should be an Elastic collision

Answer:

Did they mean those diagrams are the salt or what?

Answer:

The reactants of cellular respiration are oxygen and sugar, which are the products of photosynthesis

Explanation:

Answer:

498 kj/mol

Explanation:

Chemical reactions occur as a result of bond breaking and bond formation.

The bonds in reactants are broken and atoms are rearranged to form new bonds.

During bond breaking energy is absorbed to break the bonds of reactants while bond formation involves the release of energy during the formation of new bonds.

In our case;

In 1 mole of the Oxygen molecule, there is one O=O bond

Energy absorbed to break O=O is 498 kJ/mol

Therefore, the ΔH required to break all the bonds in one mole of Oxygen(O₂) molecules is 498kJ/mol.

Note that, bond breaking is endothermic since energy is absorbed  from the surroundings.

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Answer: As K+ is a very weak conjugate acid of KOH, hence it has no ability to react with either OH– ion or with water molecules ions.

Explanation: Name of Molecule Potassium hydroxide

Chemical formula KOH

pH value 12 to 13

Conjugate acid K+

word equation: HCl + barium --> barium chloride + hydrogen

formula equation: 2HCl + Ba --> BaCl2 + H2

given: 1.25×10^23 molecules HCl

Find: g BaCl2

given#moleculesSubA × 1molSubA/6.022×10^23 moleculeSubA × #molSubB/#molSubA × g SubB/1molSubB

The mass of barium chloride produced is 21.6 grams.

It is an inorganic compound with the chemical formula BaCl₂.

The equation: HCl + barium --> barium chloride + hydrogen

The  chemical equation : 2HCl + Ba --> BaCl₂ + H₂

Given the  1.25×10²³ molecules HCl

First, we calculate the amount of HCL

Amount of moles of HCl=

(1.25×10²³ molecules × 1 mole)/ 6.023×10²³ atoms

=0.2075 moles.

Then the number of moles is multiplied by the molar mass of barium chloride

208.24 g/mol × 0.2075 = 21.6 grams.

Thus, the mass of barium chloride produced is 21.6 grams.

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[tex]\huge\underline\mathtt\colorbox{cyan}{A. Element L}[/tex]

Explanation:

Because the unidentified element has exactly the same Bright-Line Spectra of wavelength in nanometeres as does element L.

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X=10

Explanation and workout is in the photo attached with this answer

The formula mass of hydrated sodium sulfate is Na₂SO₄.10H₂O. The value of x is equal to 10.

A mole is the amount of substance containing the same number of elementary entities as the number of atoms present in a pure sample of any element.

A mole is also described as the amount of a substance that contains 6.022×10²³ fundamental entities of the given substance.

The mole concept is a convenient method of representing the amount of a substance.

Given, the mass of the hydrated sodium sulfate = 10.0g

The mass of the anhydrous sodium sulfate is produced = 4.40g

Mass of the water evaporated as water on heating = 10.0 - 4.40 = 5.6g

The number of moles of water = 5.6/18 = 0.31 mol

Similarly, the number of moles of sodium sulfate = 4.4/142.04 = 0.031 mol

The ratio of the number of the moles of the sodium sulfate and water:

[tex]\frac{n(H_2O)}{n(NaSO_4)}=\frac{0.31}{0.031} = 10[/tex]

Therefore, the ten moles of water will be evaporated for the one mole of sodium sulfate. Therefore, the formula mass is Na₂SO₄.10H₂O.

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Answer: bro- i have no idea wat science that is but heres the water cycle-