PLEASE HELP !!!

Which of the following measurements is used to measure the enthalpy of combustion?

A. Measuring the change in temperature when two liquids are mixed.
B. None of these
C. Measuring the change in temperature of a beaker of water.
D. It cannot be measured, only calculated using the equation: q = mc∆T.

Answer:

polar

Explanation:

Answer:

Two similar atoms or different atoms

Explanation:

A molecule is made up of at least two similar atoms or different atoms.

A molecule is the smallest particle of a substance capable of independent existence.

Answer: Two similar atoms or different atoms.

Have a great day!

Answer: B

Explanation:

protons are positive,

electrons are negative,

and neutrons are neutral.

the amount of electrons to protons is always the same in a balanced atom.

electrons can be removed creating "ions" which is simply an unbalanced atom. removing protons would result in a different type of atom or element.

Answer:

Neutron - neutral

Explanation:

This was the correct answer for the test I just took.

Answer:

New growth of trees is an exception

Explanation:

when volcanoes erupt, they release hot magma that is destructive to the environment causing personal damage, lack of breathable air and death.

heat produce cannot in any way help in growth of trees

A welding torch produces a flame by burning of acetylene fuel then energy released from the acetylene fuel is then used to melt a metal, so transformation of chemical energy into thermal energy takes place.

Energy neither can be produced nor destroyed but it only transfers from one form to other form.

In the question it is given that, burning of acetylene produces energy and this produced energy is a type of chemical energy and then this is used as a thermal energy for the melting of metal.

So conversion of kinetic energy to potential energy, thermal energy to electromagnetic energy and potential energy to chemical is wrong.

Hence transformation of chemical energy into thermal energy takes place.

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Answer:

A welding torch produces a flame by burning of acetylene fuel then energy released from the acetylene fuel is then used to melt a metal, so transformation of chemical energy into thermal energy takes place.

What is transfer of energy?

Energy neither can be produced nor destroyed but it only transfers from one form to other form.

In the question it is given that, burning of acetylene produces energy and this produced energy is a type of chemical energy and then this is used as a thermal energy for the melting of metal.

So conversion of kinetic energy to potential energy, thermal energy to electromagnetic energy and potential energy to chemical is wrong.

ANSWER IS (D)

Explanation:

Answer:

m=175

Explanation:

100/16 = 6.25

6.25x28 = 175

Answer: To solve this equation for m, you can divide both sides of the equation by 0.16. This will give you:

m = 28 / 0.16

Simplifying the right side of the equation gives:

m = 175

Therefore, m = 175.

Explanation:

The bond formed is an ionic bond.

Element A has a total of 20 electrons in its electron cloud, while Element B has 16 electrons in its electron cloud. The difference in the number of electrons in each atom's electron cloud is the key factor determining the type of bond that will form between A and B.

Generally, when the difference in the number of electrons is greater than two, the bond formed will be an ionic bond. This is because the element with the greater number of electrons will have a stronger attraction to the other element, thus transferring electrons and forming a bond.

In this case, Element A has 20 electrons while Element B has 16 electrons, resulting in a difference of 4. Both will try to obtain a noble gas configuration.

In an ionic bond, one atom gives away one or more electrons to the other atom, resulting in an unequal sharing of electrons. The atom with the greater number of electrons (Element A in this case) gives away electrons, resulting in a positive charge. The atom with the lesser number of electrons (Element B in this case) receives electrons, resulting in a negative charge.

In the process, both obtain the noble gas configuration in their shell. Element A will do so by giving away 2 electrons to B and B will do so by gaining 2 electrons from A. This means that an ionic bond will form between the two elements.

As a result, the two elements form an electrostatic bond, with Element A being positively charged and Element B being negatively charged.

Therefore, an ionic bond is formed between Element A and Element B with the former having 20 electrons and the latter having 16 electrons in their electron cloud.

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Answer:

Boiling point of H2S is (-60.2 C°)

Explanation:

This is very less than water because hydrogen bonding is present in water that is absent in H2S

Answer:

Tin (IV) Phosphate

Explanation:

"Stock nomenclature for inorganic compounds is a widely used system of chemical nomenclature developed by the German chemist Alfred Stock and first published in 1919. In the "Stock system", the oxidation states of some or all of the elements in a compound are indicated in parentheses by Roman numerals."

In the balanced equation for the reaction\(MnO_{4}^-(aq) + Fe_{2} ^+(aq) -- > Mn_{2}^+(aq) + Fe_{3}^+(aq)\) in basic aqueous solution, the coefficient for OH−(aq) is 4.

To balance the given equation in basic aqueous solution, we need to ensure that the number of atoms of each element is equal on both sides of the equation and that the overall charge is balanced. Here's how the equation is balanced:

First, we balance the atoms other than hydrogen and oxygen. The equation becomes:

\(MnO_{4}^-(aq) + 5Fe_{2} ^+(aq)+8H_{2}O(l) -- > Mn_{2}^+(aq) +5 Fe_{3}^+(aq)\)

Next, we balance the oxygen atoms by adding water molecules (H2O):

\(MnO_{4}^-(aq) + 5Fe_{2} ^+(aq)+8H_{2}O(l) -- > Mn_{2}^+(aq) +5 Fe_{3}^+(aq)+4H_{2}O(l)\)

Now, we balance the hydrogen atoms by adding OH−(aq) ions:

\(MnO_{4}^-(aq) + 5Fe_{2} ^+(aq)+8H_{2}O(l) -- > Mn_{2}^+(aq) +5 Fe_{3}^+(aq)+4H_{2}O(l)+4OH^-(aq)\)

Therefore, in the balanced equation, the coefficient for OH−(aq) is 4. This balances the hydrogen atoms and ensures that the equation is balanced in basic aqueous solution.

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The substitution product that is suppose to be favoured is The product with retention of configuration is expected to predominate slightly, because the leaving group blocks the nucleophile.

Substitution product is a product that is gotten from a reaction in which a group of reactant is replaced by another group in the reaction.

Therefore,The substitution product that is suppose to be favoured is The product with retention of configuration is expected to predominate slightly, because the leaving group blocks the nucleophile.

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The number of moles of NaCl present in 276.50 mL of 1.55 M NaCl solution is 0.429 mol.

To find the number of moles of NaCl in a given solution, we can use the formula: moles of solute = concentration of solution x volume of solution We are given the following information:Concentration of solution = 1.55 MVolume of solution = 276.50 mL

To use this formula, we need to convert the volume of the solution from milliliters (mL) to liters (L).1 L = 1000 mLTherefore, 276.50 mL = 0.27650 LNow, we can substitute the given values in the formula and calculate the number of moles of NaCl present in the solution:moles of solute = concentration of solution x volume of solution= 1.55 M x 0.27650 L= 0.429 molTherefore, there are 0.429 moles of NaCl in 276.50 mL of 1.55 M NaCl solution. Hence, the correct option is 0.429.

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The total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.

To calculate the total charge that flows while the battery is being charged, we can use the relationship between electrical energy, potential difference, and charge.

The electrical energy (E) stored in the battery is given as 64 mega Jules (64 MJ). The potential difference (V) provided by the battery is 330 volts. We know that the energy (E) is equal to the product of the potential difference (V) and the charge (Q):

E = V * Q

Since the charging process is 100% efficient, all the electrical energy supplied is stored in the battery. Therefore, we can rearrange the equation to solve for the charge (Q):

Q = E / V

Substituting the given values, we have:

Q = 64 MJ / 330 V

To perform the calculation, we need to convert mega Jules (MJ) to joules (J) since the SI unit of energy is joules. One mega Joule is equal to 1 million joules:

Q = (64 * 10^6 J) / 330 V

Calculating the division:

Q ≈ 193,939.39 Coulombs

Therefore, the total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.

This value represents the quantity of electric charge transferred during the charging process, and it indicates the amount of electricity that enters the battery.

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Answer:

Lithium has a melting point of 180.54 C, a boiling point of 1342 C, a specific gravity of 0.534 (20 C), and a valence of 1. It is the lightest of the metals, with a density approximately half that of water. Under ordinary conditions, lithium is the least dense of the solid elements.

Appearance: soft, silvery-white metal

Atomic Number: 3

Atomic Radius (pm): 155

Answer: for the first question, Hypochloride is being released from your bleach to oxidize your fabric. As you know oxidation simply mean addition of oxygen, so when hypochloride (ClO-) comes in contact with fabric oxygen is added and some organic bonds are broken and the dirt is washed out.

For the second question. The melting and boiling point of pure substance is sharp. Like water has 100oC boiling point and OoC melting point. So anything from that means it has impurities in it. Just like if you make tea, you have introduce something else into the water, if you should try boiling your tea, you'll find out that the boiling point is not going to 100oC anymore. Every other liquid have their boiling point and melting point. When you know them, you'll be able to determine the purity.

Answer:

characteristic

Explanation:

Answer:

liquid

Explanation:

Answer:

waxing crescent is the right answer to this question

Answer:

a)Carbon (iv) oxide; CO₂

b)It is used in fire extinguishers

c) i. It is denser than air

ii. It dissolves in water to form an acidic solution

Explanation:

a) Since the compound P is composed of one atom of carbon and two atoms of oxygen, the formula of the compound is CO₂. The name of the compound is carbon(iv) oxide.

b) Carbon (iv) oxide is a gas that is of great importance to living organisms. Plants require it for photosynthesis while human produce it during the process of respiration.

Industrially, it is used in carbonated drinks. It is also used in fire extinguishers

c) The properties of Carbon (iv) oxide include the following:

i) it is an odourless colorless gas

ii) it is denser than air

iii) it dissolves in water to form a weak acidic solution, etc.

The total concentration (or molarity) of nitrate ions in the mixed solution will be 2 M (2 mol/L).

The nitrate ion in the final solution will originate from both nitric acid and magnesium nitrate. To find the final molarity, it is easiest to find the number of moles originating from nitric acid, then do the same for magnesium nitrate, add those moles together, and divide them by the total volume.

Because 1 mol of nitric acid generates 1 mol of nitrate ions, the amount of nitrate ions will be equal to the amount of nitric acid.

c = n/V ⇒ n = V*c = 0.100 L * 0.200 M = 0.02 mol

On the other hand, 1 mol of magnesium nitrate generates 2 moles of nitrate ions, so the amount of nitrate ions will be double the amount of magnesium nitrate.

n = V*c = 0.200 L * 0.100 M = 0.02 mol of magnesium nitrate ⇒ 0.04 mol of nitrate ions

total amount = 0.02 mol + 0.04 mol = 0.06 mol

total volume = 0.100 L + 0.02 L = 0.03 L

c = n/V = 0.06 mol / 0.03 L = 2 M

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Answer: the answer is C

Explanation:

Answer:C - 3.115 g

Explanation:Correct

The correct option is A, the boiling point and freezing point of water at standard pressure is the freezing point of the solution is higher and the boiling point of the solution is lower.

Standard pressure is a term used to describe the atmospheric pressure at sea level under standard conditions, which is defined as 101.325 kilopascals (kPa) or 1 atmosphere (atm). This means that the pressure exerted by the Earth's atmosphere on the surface of the Earth is equivalent to the pressure exerted by a column of mercury 760 millimeters high in a barometer.

Standard pressure is used as a reference point for many scientific and engineering calculations, such as the ideal gas law, which relates the pressure, volume, and temperature of a gas. In addition, many meteorological measurements are based on standard pressure, such as air pressure measurements and weather forecasting.

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Answer:

14cm^3

Explanation:

The camel consumed approximately 2.24 kg of protein from the Bermudagrass hay.

To calculate the amount of protein the camel consumed, we need to consider the dry matter basis of the hay. Here's how you can calculate it:

Calculate the dry matter weight of the hay:

Dry Matter Weight = Total Weight of Hay × Dry Matter Percentage

Dry Matter Weight = 18.3 kg × (83.4/100)

Dry Matter Weight = 18.3 kg × 0.834

Dry Matter Weight = 15.2442 kg

Calculate the protein content in the dry matter;

Protein Content = Dry Matter Weight × Protein Percentage

Protein Content = 15.2442 kg × (14.7/100)

Protein Content = 15.2442 kg × 0.147

Protein Content = 2.2414194 kg

Therefore, the camel consumed approximately 2.24 kg of protein from the Bermudagrass hay.

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Answer:

3 Handsprings

Explanation:

18 divided by 6 is 3

Answer:

i think its oxidation

Explanation:

Answer:

I believe its F: 2.55

Explanation:

I know I'm very late, positive you're past this question, I'd hope at least.

Answer:

Chemist Dmitri Mendeleev

Answer: both

Explanation: