The question is in the photo (Sorry for being lazy lol )

We are given an equation that shows the differential rate change of the reaction and it is given as

This depicts the decomposition reaction of N₂O₅. The forward reaction (product) carries a positive sign while the backward reaction or (reactant) carries a negative sign.

We can as well integrate this, but for the sake of simplicity, the equation of reaction is given as

Answer

C. 3-methylhexane.

Explanation

In a systematic system of naming organic molecules, te longest chain wof carbon ill be considrered first.

So the longest chain of carbon in the molecule will be 6 (hexane) and not 5 (pentane).

The parent name of the molecule will be hexane.

The only methyl group left is bonded to carbon 3 (numbering in such a way the methyl group s given the least number possible).

Therefore, the correct name of the molecule is 3-methylhexane.

The answer is C. 3-methylhexane.

Assuming the reactions are for complete combustion, the products are always carbon dioxide and water, so the unbalanced equation is:

Now, we need to balance it.

As we can see, the carbon atom, C, only appears in one place on both sides, so let's start by balancing it.

We have 5 carbon on the left side, and one carbon of the right side, so we can balance the carbon atom by adding a coefficient of 5 on CO₂:

Now, we can balance the hydrogen atom, H. We have 12 hydrogen on the left side and 2 per water molecule on the right side. So, we can put the coefficient 6 on the water, so we balance the H atom:

Now, we need to check wheter the oxygen atom, O, is balanced.

On the left side, we have 8 times 2, so 16 oxygen.

On the right side we have 5 times 2 on CO₂, so 10, plus 6 on the water, so a total of 16 oxygen.

Since both side are equal, the equation is balanced.

So, the final equation is:

Answer

The Specific Heat of zinc = 11.11 J/g°C

Explanation

Given:

Mass of the zinc sample, m = 3 g

Quantity of heat, Q = 100 J

Initial temperature, T₁ = 22 °C

Final temperature, T₂ = 25 °C

The change in temperature, ΔT = T₂ - T₁ = 25 °C - 22 °C = 3 °C

What to find:

The Specific Heat of zinc, c

Step-by-step solution:

The Specific Heat of zinc, c can be calculated using the formula given below.Q=m

Putting the values of the given parameters into the formula, we have;c

Hence, the Specific Heat of zinc is 11.11 J/g°C

Answer

Molarity = 1.28 mol/L

Explanation

Given:

Mass of NaCl = 75 g

Volume of water = 1.0 L

What to find:

The molarity of the solution.

Step-by-step solution:

The molarity of the solution can be calculated using the molarity formula given below:

However, you need to convert the mass of NaCl given to moles using the mole formula; Mass divided by molar mass.

The molar mass of NaCl = 58.44 g/mol

Now, the molarity is

Hence, the molarity of the solution is 1.28 mol/L

Phase transitions is when a substance go through a change in its physical state, for example, solid to liquid, liquid to gas, etc. Energy in this case must be absorbed or released, and not necessarily it will be seen a change of temperature in this case. Mathematically, we calculate the energy released or absorbed by using the molar enthalpy of vaporization or molar enthalpy of fusion, as we can see in the following formulas:

ΔH = m*ΔHvap

ΔH = m*ΔHfusion

So phase transition is the energy required for a substance to change the physical state.

Answer: the structure given can be named as 2,3-dichloro-5,6-dimethyl-heptan-4-ol

Explanation:

The question requires us to determine the correct name for the chemical structure given:

To clarify the structure given, let's identify the carbons in the main chain:

Also, we need to identify the functional groups bonded to the carbons in the main chain:

Note that there are three types of functional groups (marked in different colors): 2 Cl atoms (green), 1 hydroxyl group (-OH, blue) and 2 methyl groups (-CH3, purple). Also, note that there are only two methyl groups in the chain, as the carbon numbered as "1" is part of the main chain and not a functional group bonded to it.

Now that we know the size of the main chain, its type (only single bonds between carbons) and the functional groups bonded to it, we can determine the name of the compound:

- main chain of 7 carbons only with single bonds: heptane

- name and position of functional groups: 2,3-dichloro; 4-alcohol, 5,6-dimethyl

Therefore, the complete name of this compound would be:

2,3-dichloro-5,6-dimethyl-heptan-4-ol

Answer for number 4: Share the electrons unequally (I think. I am not 100% about this answer)

Explanation: Covalent bonds in which atoms share electrons unequally are polar. Covalent bonds involve the sharing of electrons between two atoms, but those electrons are not always shared equally. As the electronegativity difference between atoms in a covalent bond increases, electron sharing becomes less even.

First, we must know this:

Weight is a kind of force, P = m x g

m is the mass of the object and g is the acceleration of gravity

The unit of P in SI is N = kg m/(s)^2

Let's convert our mass in kg => 100,000 g = 100 kg

The acceleration of gravity = 9.8 m/(s)^2 (we assume this value)

Now, P = 100 kg x 9.8 m/(s)^2 = 980 N (newton)

Answer: 980 N

The percent cabon in the compound is 84.22%.

1st) We need to calculate the molar mass of C4H9 with the atomic mass of carbon (C) and hydrogen (H). We can find the atomic mass in the Periodic Table of Elements:

- Carbon atomic mass: 12.01 g/mol

- Hydrogen atomic mass: 1 g/mol

The compound C4H9 has 4 carbon atoms and 9 hydrogen atoms:

(12.01 g/mol x 4) + (1 g/mol x 9) = 57.04 g/mol

So, compound C4H9 weighs 57.04g/mol.

2nd) We know that 57.04 g represents the 100% of C4H9, so with a mathematical Rule of Three we can calculate the percent carbon in C4H9 knowing that all the carbon in the molecule weighs 48.04g (12.04 g x 4):

Finally, the percent cabon by mass in the compound is 84.22%.

Let's look at the aldehyde. We must look for a similar structure for your task.

Circle the carbon on the right.

Answer:

The scenario that is the best example of energy transfer by convection is: "warm air near the equator rising higher in the atmosphere".

Explanation:

Convection is the way of transmitting heat through a liquid or gaseous medium, so the scenario that is the best example of energy transfer by convection is: "warm air near the equator rising higher in the atmosphere".

That is the best example, because the heat is transmitted throgh the air (gas), from the warmer air going up, while the cooler air goes down.

This is known as natural convection.

26.67 grams of H₂O are made.

Standard sets of circumstances for experimental measurements are established at standard pressures and temperatures to enable comparisons between various sets of data.

A chemical equation that is balanced has equal amounts of each element's atoms on both sides of the equation and conserves mass.

1 mole of any gas = 22.4 L

We have,

4.16 L of O₂

Now,

The molar mass of H₂O = 18.0 g

By using stoichiometry,

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

We can see that the reaction is completed and balanced.

Therefore,

5 × 22.4L O₂ = 4 × 18.0 g H₂O

Let x be the number of grams of H₂O made after the reaction.

4.16 L O2

x = 4.16 L O₂ × 4 × 18.0 g H₂O / 5 × 22.4 L O₂

x = 2.67 g H₂O

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To prepare sich solution, we would have to have a good measure of the solution added and of the final volume.

We may use a volumetric pipet to prepare it, but we won't prepare in a pipet, we would use it to measure something we would add.

A beaker or an Erlenmeyer flask don't have a good precision for volume measure, so they are bad to prepare the solution.

So, the best is to prepare in a volumetric flask, because its volumetric meaures is very precise.

1) List known data

NA = 6.022*10^23

List unknown data

Mass in grams:

Molar mass: 92.906 g/mol

2) Find out the mass

One atom of niobium weighs 1.543*10^-22 g

The reaction is balanced because the number of atoms of each element or particle is equal on both sides of the equation.

Nuclear reaction is the process such as the fission of an atomic nucleus, or the fusion of one or more atomic nuclei and/or subatomic particles in which the number of protons and/or neutrons in a nucleus changes.

The reaction products in a nuclear reaction may contain a different element or a different isotope of the same element.

According to this question, the following fission reaction of uranium is given below:

238/92 → 234/90Th + 4/2α

Based on the above reaction, the sum of the atomic mass and atomic number of the products is 238 and 92 respectively. This means that the equation is balanced.

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Valence electrons are present in Fe is 8 and inner is 20 and outer is 8

A valence electron is the outer shell associated with an atom and that can participate in the formation of a chemical bond if the outer shell is not closed and in iron the atomic number of iron is 26 and hence, the valence electrons that are present in iron are 8 the outer electrons in iron are 8. The inner electrons in iron are 20

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1) Balance the chemical equation

2) Moles of KCl produced from 2.50 mol K.

The molar ratio between KCl and K is 2 mol KCl: 2 mol K.

2.50 mol K will poroduce 2.50 mol KCl.

.

The number of protons, neutrons, and electrons in isolated ions having the following nuclear symbols:

a) ¹⁹F⁻ has 9 protons 10 neutrons 10 electrons

b) ²⁴Mg²⁺ has 12 protons 12 neutrons 10 electrons

c) ⁵⁶Fe³⁺ has 26 protons 30 neutrons 23 electrons

a) ¹⁹F⁻

The atomic no. of F is 9 . atomic number shows the no. of protons. the no. of protons is 9. number of protons = no. electrons for neutral atom but here -1 shows one extra electron. number of electrons is 10. neutrons is the difference in mass no. and the atomic number. number of neutrons = 19 - 9 = 10

¹⁹F⁻ has 9 protons 10 neutrons 10 electrons

b) ²⁴Mg²⁺

The atomic no. is 12 . number of protons is 12. +2 represents 2 electrons are removed. number of electrons is 10. neutrons = mass no. - atomic no. number of neutrons = 30

²⁴Mg²⁺ has 12 protons 12 neutrons 10 electrons

c) ⁵⁶Fe³⁺

The atomic number is 26. number of protons = 26. +3 means three electrons are removed. number of electrons are 23. neutrons = 56 - 26 = 30.

⁵⁶Fe³⁺ has 26 protons 30 neutrons 23 electrons

Thus, The number of protons, neutrons, and electrons in isolated ions having the following nuclear symbols:

a) ¹⁹F⁻ has 9 protons 10 neutrons 10 electrons

b) ²⁴Mg²⁺ has 12 protons 12 neutrons 10 electrons

c) ⁵⁶Fe³⁺ has 26 protons 30 neutrons 23 electrons

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Hence, the number of covalent bonds that an atom can form depends on the number of in the atom is correct.

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How will you describe the pattern as electrons are distributed?

In a simple way, you can say, electrons are arranged around an atom's nucleus.

When electrons are near the nucleus, have the lowest energy. Electrons further aways will have higher energy.

We can say electrons are in different shells with different energy. Inside those shells, electrons are in subshells too.

Then you have some numbers that describe the completly characteristics of an electron in an atom.

They are called Quantum Numbers. They are four

1) The principal Quantum number (n): describes the energy of an electron and the most probable distance of the electron from the nucleus. In other words, it refers to the size of the orbital and the energy level an electron is placed in.

2) The number of subshells or (l): describes the shape of the orbital. It can also be used to determine the number of angular nodes.

3) The magnetic Quantum number (ml): describes the energy levels in a subshell. (Remember we have shells and inside of them we have subshells)

4) The Spin of the Electron (ms): refers to the spin of the electron which can either be up or down.

Answer:

because it has 4 figure 2 atoms

Explanation:

A body that orbits a planet is satellite.

Answer:

A satellite is a body that orbits a planet. the earth natural satellite is the moon. while the body that revolve round the sun is called planets

Explanation:

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Answer

The balanced complete ionic equation is:

Mg²⁺(aq) + SO₄²⁻(aq) + 2Na⁺(aq) + 2OH⁻(aq) → Mg(OH)₂(s) + 2Na⁺(aq) + SO₄²⁻(aq)

The net ionic equation is:

Mg²⁺(aq) + 2OH⁻(aq) → Mg(OH)₂(s)

Explanation

When aqueous NaOH and MgSO4 are combined, solid Mg(OH)2 and aqueous Na2SO4.

The balanced complete molecular equation for the precipitation reaction is:

MgSO₄(aq) + 2NaOH(aq) → Mg(OH)₂(s) + Na₂SO₄(aq)

The balanced complete ionic equation for the precipitation reaction is:

Mg²⁺(aq) + SO₄²⁻(aq) + 2Na⁺(aq) + 2OH⁻(aq) → Mg(OH)₂(s) + 2Na⁺(aq) + SO₄²⁻(aq)

The spectator ions are SO₄²⁻(aq) and Na⁺(aq). Therefore, condensing the complete ionic equation will result in a net ionic equation given below:

Mg²⁺(aq) + 2OH⁻(aq) → Mg(OH)₂(s)

ANSWER

EXPLANATION

Follow the steps below to convert 1.36atm to Kpa

Recall, that 1 atm is equivalent to 101.325Kpa

Therefore, the correct answer is option C (1.38 x 10^2 Kpa)

To determine the moles of copper we must use its atomic weight. This value can be found in the periodic table. The atomic weight of copper is 63.546g/mol, so the moles of copper will be:

The moles of Cu in 51.226g are 0.806 mol

When a solid warms up and changes to a liquid, this is a physical change.

A chemical reaction results in the formation of a new molecule. This are correct statement.

Physical changes are defined as the changes which affects the form of the chemical substance, but never changes its chemical composition. Thus, this type of changes are used to separate the mixtures into their component compounds, but it can not usually be used to separate the compounds into chemical elements or simpler compounds.

Chemical changes is a type of reaction which occur when a substance combines with another compound to form a new substance, called as chemical synthesis or, simultaneously, chemical decomposition into two or more different type of substances. These are not reversible in nature except by further chemical reactions.

Thus, we concluded that When a solid warms up and changes to a liquid, this is a physical change.

A chemical reaction results in the formation of a new molecule. This are correct statement.

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Based on the chemical equation 2 moles of oygen gas produces 1 mole of carbon dioxide, using this relationship we can set up an equation that would determine the amount of moles needed to produce 5.67 moles of carbon dioxide:

Answer: It will require 11.34 mol O2 gas.

answer and explanation

alkali earth metals are on the second group of the periodic table and the have two valence electrons

option: C

Answer:

I wouldn't risk it if i were you haha

Explanation: