Which method of heat transfer takes place when particles of matter vibrate and collide with each other in direct contact? Conduction Convection Insulation Radiation

Answer:

2 boxes

Explanation:

==>Given that:

Box A = 10 grams

Box B = 5 grams

Box C= 1 A and 1 B = 15 grams

==>Required:

Number of boxes of B that would make 30 grams of C

==>Solution:

We know that, 1 box of B would give us 15grams of of C when mixed in the right proportion with 1 box of A.

thus,

1 box of B => 15 grams of C

x box of B => 30 grams of C

Therefore x = (30*1)/15

x = 30/15

x = 2

2 boxes of B would be required to make 30 grams of C

Answer: Fossils of the species have never been found because:-

a. There were few members of the species.

d. Their bodies decompose quickly.

For an organism to become fossil it is important that it do not decompose before it get buried by sediments.

What are fossils?

A fossil is any preserved remains, impression, or trace of any once-living thing from a past geological age.

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Answer: The answer is B and A.

Explanation:

I took the test!

Answer:

they produce water and a neutral ionic compound called a salt. The reaction is called a neutralization reaction.

Explanation:

Answer:

Solution B: [OH-] = 1×10^–6 M

Solution C: [OH-] = 1×10^–6 M

Explanation:

Solution B:

Hydronium ion concentration, [H3O+] = 9.99×10^–9 M

Hydroxide ion concentration, [OH-] = ?

The Hydroxide ion concentration, [OH-] can be obtained as follow:

[H3O+] × [OH-] = 1×10^–14

9.99×10^–9 × [OH-] = 1×10^–14

Divide both side by 9.99×10^–9

[OH-] = 1×10^–14 / 9.99×10^–9

[OH-] = 1×10^–6 M

Therefore, the Hydroxide ion concentration, [OH-] is 1×10^–6 M

Solution C:

Hydronium ion concentration, [H3O+] = 0.000777 M

Hydroxide ion concentration, [OH-] = ?

The Hydroxide ion concentration, [OH-] can be obtained as follow:

[H3O+] × [OH-] = 1×10^–14

0.000777 × [OH-] = 1×10^–14

Divide both side by 0.000777

[OH-] = 1×10^–14 / 0.000777

[OH-] = 1.29×10^–11 M

Therefore, the Hydroxide ion concentration, [OH-] is 1.29×10^–11 M

Answer:

0.955 atm

Explanation:

We apply this formula derivated from the Ideal Gases Law

P₁ . V₁ / T₁ = P₂ . V₂ / T₂

We need to convert the temperature to absolute values

20°C + 273 K = 293K

40°C + 273 K = 313 K

Now we make a convertion for the pressure unit:

365 mmHg . 1 atm / 760 mmHg = 0.480 atm

We replace data:

(0.480 atm . 4.10L) / 293 K = (P₂ . 2.20 L) / 313K

[(0.480 atm . 4.10L) / 293 K] . 313 K = P₂ . 2.20 L

2.10 L.atm = P₂ . 2.20 L → P₂ = 2.10 L.atm/2.20L ⇒ 0.955 atm

Answer:  1.5

Explanation:

The pH of a solution is given by the formular; pH = - log [ H+ ]. Therefore, for  H2SO4, it is;

pH = - log [ 3 x 10 ∧ -2]

     =  2   - log 3

     =  2 - 0.4771 = 1.5 approximately

Answer:

3.79 g of N2.

Explanation:

We'll begin by writing the balanced equation for the reaction.

This is given below:

4NH3 + 3O2 → 2N2 + 6H2O

Next, we shall determine the mass of O2 that reacted and the mass of N2 produced from the balanced equation.

This is illustrated below:

Molar mass of O2 = 16x2 = 32 g/mol

Mass of O2 from the balanced equation = 3 x 32 = 96 g

Molar mass of N2 = 2x14 = 28 g/mol

Mass of N2 from the balanced equation = 2 x 28 = 56 g

Summary:

From the balanced equation above,

96 g of O2 reacted to produce 56 g of N2.

Finally, we shall determine the mass of N2 produced by reacting 6.50 g of O2.

This can be obtained as follow:

From the balanced equation above,

96 g of O2 reacted to produce 56 g of N2.

Therefore, 6.50 g of O2 will react to produce = (6.50 x 56)/96 = 3.79 g of N2.

Therefore, 3.79 g of N2 were obtained from the reaction..

Answer:

RCOOR

Explanation:

Odyssey ware

RCOOR is the functional group for an ester. An ester is an organic molecule created when an acid and an alcohol interact. The general structure of the compound is RCOOR, where R is an aryl or alkyl group.

This functional group is made up of an alkyl or aryl group (R) and a carbonyl group (C=O) linked to an oxygen atom. Two additional carbon atoms, one of which is a member of the carbonyl group and the other of which is a member of the alkyl or aryl group, are joined to the oxygen atom.

The connection between the oxygen atom and the hydrogen atom of the acid is broken during the interaction of an acid with an alcohol to create an ester.of a fresh connection between the oxygen atom and the alcohol's alkyl or aryl group. As a result, the RCOOR functional group is created.

Esters are significant organic substances with many different uses. They serve as solvents and are employed in the synthesis of flavours, perfumes, polymers, medicines, and other products. They are also employed in the creation of fragrances and cosmetics, as well as as lubricants. Other organic compounds can be made using esters as intermediates.

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Answer:

4.5 moles

Explanation:

From the equation, the mole ratio of KClO3: O2 = 2: 3

Which means, every 2 moles of KClO3 forms 3 moles of O2.

Let the no. of moles of O2 formed be y.

[tex]\frac{2}{3} = \frac{3.0}{y}[/tex]

2y = 3x3

2y = 9

y = 4.5 moles

Answer:

6.14×10²³ molecules

Explanation:

Data obtained from the question include:

Volume (V) = 10.5L

Temperature (T) = 40°C

Pressure (P) = 252 kPa

Next, we shall determine the number of mole of CO2 present.

This can be obtained by using the ideal gas equation:

PV = nRT

Volume (V) = 10.5L

Temperature (T) = 40°C = 40°C + 273 = 313K

Pressure (P) = 252 kPa

Gas constant (R) = 8.31 KPa.L/Kmol

Number of mole (n) =.?

PV = nRT

252 x 10.5 = n x 8.31 x 313

Divide both side by 8.31 x 313

n = (252 x 10.5) /(8.31 x 313)

n = 1.02 mole

Therefore, 1.02 mol of CO2 is present.

Now, we can obtain the number of molecules of CO2 present as follow:

From Avogadro's hypothesis, 1 mole of any substance contains 6.02×10²³ molecules.

This means that 1 mole of CO2 also contains 6.02×10²³ molecules.

Now, if 1 mole of CO2 contains 6.02×10²³ molecules,

Then 1.02 mole will contain = 1.02 x 6.02×10²³ = 6.14×10²³ molecules.

Therefore, 6.14×10²³ molecules of CO2 is present.

Answer:

V3− B) A nonmetal that gained three electrons

X− A) A nonmetal that gained one electron

Y+ C) A metal that lost one electron

Z3+ D) A metal that lost three electrons

Explanation:

As per the Octet rule, each atom must have eight electrons in its outermost shell.

The non-metals gain electrons while reacting to reach the configurations of noble gas as they possess lower Ionization ability and higher electro-negativity. Thus, they will have a negative charge(V3 -, X-)

Metals, on the other hand, lose electrons to reach a stable octet configuration due to the higher electro-positivity and lower electron affinity. Therefore, they will have a positive charge(Y+, Z3+).

Answer:

The object is not moving.

Explanation:

Since the position doesn't change during 4-6 (remains constant at 12m) it tells us that object is not moving and remaining at constant distance from start point.

Answer:

The object is not moving.

Explanation:

Since the distance hasn't changed from 4 seconds to 6 seconds, we know that the distance from the start stays the same between the time period. The object isn't moving away or moving closer at a constant speed, but is staying the same, constant distance away at a constant speed. Therefore, the object isn't moving.

Answer:

B

Explanation:

Answer:

The uncertainty principle

Explanation:

Essentially if you measure the momentum of the particle at a given point, then when you go to measure the position it has moved, thus you don't know the position. Vise versa if you measure the position you only capture a still frame of the particle and no information about it's momentum, which will have changed.

Answer: the uncertainly principle

Explanation:

it basically states you can not know both at the same time

Answer:

The final temperature of the bomb calorimeter is 82.98°C

Explanation:

The given information are;

The mass of the propane sample =  10.0 g

The heat capacity of the bomb calorimeter = 8.0 kJ/°C

The molar heat of combustion of propane is -2,222 kJ/mol.

The starting (initial) temperature of the water, T₁ = 20°C

The final temperature of the bomb calorimeter = T₂

The molar mas of propane = 44.1 g/mol

The number of moles, n, of propane present in 10.0 g of propane is found as follows;

[tex]Number \ of \ moles \ of \ propane, \ n = \dfrac{Mass \ of \ propane}{Molar mass \ of \ propane} = \dfrac{10}{44.1} = 0.227 \ moles[/tex]Which gives;

The heat, Δh, released from the combustion of 10.0 g of propane = 0.227 × -2222 kJ/mol  

Δh = -503.85 kJ/mol  

Heat gained by the calorimeter = Heat released from the combustion of 10.0 g of propane = 503.85 kJ/mol  

Change in heat, Δh[tex]_c[/tex] in the calorimeter = Heat capacity × Temperature change

Δh[tex]_c[/tex] = m × C

503.85 kJ/mol = 8.0 kJ/°C × (T₂ - 20°C)

T₂ = -503.85 kJ/mol/(8.0 kJ/°C) + 20°C = 82.98°C

The final temperature of the bomb calorimeter = 82.98°C

Answer:

0.0872 M

Explanation:

Use the equation M1V1 = M2V2

0.436(50.0) = (x)(250.0)

21.8 = 250x

0.0872 = x

Answer:

86.5%

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

2Na + 2HF –> 2NaF + H2

Next, we shall determine the theoretical yield of the hydrogen gas, H2. This is illustrated:

From the balanced equation above,

2 moles of Na reacted to produce 1 mole of H2.

Therefore, 5.75 moles of Na will react to produce = (5.75 x 1)/2 = 2.88 moles of H2.

Therefore, the theoretical yield of Hydrogen gas, H2 is 2.88 moles.

Finally, we shall determine the percentage yield of Hydrogen gas, H2. This can be obtained as follow:

Actual yield of H2 = 2.49 moes

Theoretical yield of H2 = 2.88 moles

Percentage yield of H2 =.?

Percentage yield = Actual yield /Theoretical yield x 100

Percentage yield = 2.49/2.88 x 100

Percentage yield = 86.5%

Therefore, the percentage yield of Hydrogen gas, H2 is 86.5%.

Answer:

The enthalpy of the reaction asked is -284 kJ/mol.

Explanation:

Given:

[tex]C(s) + \frac{1}{2}O_2(g)\rightarrow CO(g), \Delta H_1 = -111 kJ/mol [/tex]..[1]

[tex]C(s) + O_2(g)\rightarrow CO_2(g) \Delta H_2 = -395 kJ/mol[/tex]...[2]

To find ; [tex]\Delta H_{rxn}[/tex] of following reaction :

[tex]CO(g) + \frac{1}{2}O_2(g)\rightarrow CO_2(g), \Delta H_{rxn} =?[/tex]..[3]

Using Hess's Law:

[2] - [1] = [3]

[tex]\Delta H_{rxn}=\Delta H_2-\Delta H_1=-395 kJ/mol-(-111 kJ/mol)=-284 kJ/mol[/tex]

The enthalpy of the reaction asked is -284 kJ/mol.

Answer:

Mechanical energy

Answer:

Mechanical Energy

Explanation:

The mechanical energy is the sum of the objects potential energy (energy the object possess due to its position) and its kinetic energy (energy the object possess due to its motion). Adding this two energies together, gives the total mechanical energy.

Answer:

15.9 g

Explanation:

(Take the atomic mass of C=12.0, H=1.0, O=16.0)

no. of moles = mass / molar mass

no. of moles of octane used = 11.2 / (12.0x8 + 1x18)

= 0.0982456 mol

Since oxygen is in excess and octane is the limiting reagent, the no. of moles of H2O depends on the no. of moles of octane used.

From the balanced equation, the mole ratio of octane : water = 2:18 = 1: 9,

so this means, one mole of octane produced 9 moles of water.

Using this ratio, we can deduce that (y is the no. of moles of water produced):

[tex]\frac{1}{9} =\frac{0.0982456}{y}[/tex]

y = 0.0982456x9

y= 0.88421 mol

Since mass = no. of moles x molar mass,

mass of water produced = 0.88421  x (1.0x2+16.0)

=15.9 g

Answer:

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p1

Explanation:

By far, the most common ion of group 13 metals are 3+ .

So the common gallium ion is Ga³+ and it's electron configuration is [Ar] 3d10.

Hope it helps.

We can see here that the correct electron configuration of the gallium ion (Ga^3+) is: 1s^2 2s^2 2p^6 3s^2 3p^6

Electron configuration refers to the distribution of electrons in the electron shells and subshells of an atom. It is a fundamental concept in atomic structure and describes how electrons occupy specific energy levels around the nucleus of an atom.

When gallium loses three electrons to form a +3 ion (Ga^3+), it becomes a cation. The electron configuration of a neutral gallium atom is 1s^2 2s^2 2p^6 3s^2 3p^6 3d^10 4s^2 4p^1.

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Answer:

0.04 L

Explanation:

The following data were obtained from the question:

Concentration of stock solution (C1) = 18M

Volume of stock solution needed (V1) =?

Concentration of diluted solution (C2) = 1.5M

Volume of diluted solution (V2) = 0.5L

The volume of the stock solution needed can be obtain by using the dilution formula.

This is illustrated below:

C1V1 = C2V2

18 x V1 = 1.5 x 0.5

Divide both side by 18

V1 = (1.5 x 0.5)/18

V1 = 0.04L

Therefore, the volume of the stock solution needed is 0.04L.

Answer:

C. Alchemy is not scientific, but chemistry is based on evidence.

Explanation:

Alchemy was based on mystical beliefs instead of the scientific method.

Chemistry is the study of matter and change based on evidence.

Answer:

Explanation:

a )

3NO₂(g) + H₂O(l) — -→ 2HNO₃(aq) + NO(g)

3 x 46 g       18 g            2 x 63 g       30 g

138 g of NO₂ requires 18 g of H₂O

28 g of NO₂ requires ( 18 / 138) x 28

= 3.65 g of H₂O.

b )

18 g of H₂O produces 30 g of NO gas

15.8 g of H₂O produces ( 30/18 ) x 15.8

= 26.33 g of NO gas .

c )

138 g of NO₂ produces 126 g of HNO₃

8.25 g  of NO₂ produces (126 / 138 ) x 8.25

= 7.53 g of HNO₃

this shows that magnesium is higher in the reactivity series than lead.

I don't think there can be an ionic equation written because both components are in solid form and neither is in an aqeuos state.

Reactivity series is the progression of the metals based on the activity. In a reaction between magnesium and lead (II) oxide, it can be said that lead is at a lower position in the reactivity series.

Reactivity series is the depiction of the metals in a decreasing order based on their ability to displace the other metal in the reaction. More reactive species are placed at the upper position, while the less reactive species are placed at the lower positions.

In the series, magnesium is placed at the upper part of the series and has high reactivity, whereas lead is placed at the lower level with low reactivity. hence, in the reaction, Mg replaces Pb and forms a bond with oxygen.

The reaction between magnesium and lead (II) oxide cannot be written in the ionic form as all the reactants and the products are in the solid state and not in an aqueous state.

Therefore, lead is at a lower level of reactivity series.

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sodium will form an ionic bond

Answer:

C. Oxygen

Explanation:

Oxygen will not form a polar covalent bond with another oxygen atom because when 2 atoms of the same element bond, it is a nonpolar covalent bond.

Since they are the same element, the 2 oxygens have the same electronegativity and will share their electrons equally.

Polar covalent bonds involve 2 atoms that will share electrons unequally

Answer:

got c

Explanation:

When dissolved in water, an acid or a base breaks down into a positive and a negative ion.

What is an acid-base reactions?

An acid–base reaction is a chemical reaction that occurs between an acid and a base. Acid-base reactions can be used to determine pH.

When dissolved in water, acids donate hydrogen ions (H+). Hydrogen ions are hydrogen atoms that have lost an electron and now have just a proton, giving them a positive electrical charge, whereas, bases,  when dissolved in water yield hydroxide ions (OH-).

If a solution has a high concentration of H+ ions, then it is acidic whereas the solution having high concentration of OH- ions, called as  basic.

Thus, from above , it is clear that when dissolved in water, an acid or a base breaks down into a positive and a negative ion.

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Answer:

8.82g

Explanation:

Answer:

53J

Explanation:

Total Energy is the sum of Kinetic energy and potential energy.