A. 207 kJ
B. 4730 kJ
C. 9460 kJ
D. 414 kJ

Answer:

Compounds

Explanation:

All compounds of a substance shares chemical bonds between them and their structures.

The bonds can come in different forms. Compound are held by chemical bonds within their atoms.

Answer:

0.04 moles of CH₄  are required

Explanation:

Given data:

Number of moles of CH₄ required = ?

Number of moles of O₂ present = 0.08 mol

Solution:

Chemical equation:

CH₄ + 2O₂     →   CO₂ + 2H₂O      

now we will compare the moles of oxygen and methane.

                      O₂          :        CH₄

                       2           :           1

                     0.08        :        1/2×0.08 = 0.04

Thus, 0.04 moles of CH₄  are required.

Answer:

815mL am 10000000% sure

Answer:

B

Explanation:

Answer:

tertiary

Explanation:

tertiary halogenoalkanes are more reactive than primary and secondary as the carbocation is more stable due to alkyl groups( have high electron density) donating electrons to stabilise the carbocation

Answer:

Fluorine has nine electrons

Answer: It’s called a alpha particle

Explanation:

Answer:

evaluation

Explanation: Big brain

Answer:

Decomposition

Explanation:

One reactant has formed two products

Answer:

I think it's C

Explanation:

all the other ones are homogeneous because they are uniform and the same when mixed

a. lemonade is one color(yellow when mixed the same throughout)

b. omelet is scrambled together and the cheese and eggs melt together to be one

c.ice cubes and water are the same, both water

trail mix is the only different one made with different ingredients that standout

hetero- different (trail mix)

homo- same (lemonade)

Answer:

It has 7 electrons in it last shell. it will gain one electron to complete its octet and become Cl-. The ionic bond of chlorine form with potassium is Kcl ( potassium chloride)

To solve such this we must know the concept of ionic reaction. Cl is the element could gain one electron to form an ionic bond with potassium.

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound.

Potassium will act as cation as K⁺, chlorine has 7 electrons in it last shell, it can gain one electron to complete its octet and become Cl⁻. The ionic compound of Cl with K is KCl.

Phosphorus has 5 electrons in its last shell it so, it needs 3 more electron to get stable .Sulphur has 6 electron, it needs 2 electrons to get stable. Argon is already stable as it has 8 electrons in its last shell so, it will not gain or loose any electrons.

Therefore, Cl is the element could gain one electron to form an ionic bond with potassium.

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Answer:

The temperature finally increased from 20 °C to 38.7 °C

Explanation:

This a problem about calorimetry. Formula to solve it is:

Q = m . C . ΔT

Where ΔT is Final T° - Initial T°

m is the mass

and C, specific heat.

In this situation we are dissolving NaOH where 1 mol requires 44.4 kJ of heat. As we do not have 1 mol, we need to determine the heat that is released.

We convert the mass to moles

14.1 g . 1 mol / 40g = 0.3525 mol

We determine the heat

0.3525 mol . 44400 J/mol = 15651 Joules of heat.

Now we can replace data in the calorimetry formula:

15651 J = 200 g . 4.18 J/g°C (Final T° - 20°C)

15651 J / (200 g . 4.18 J/g°C) = Final T° - 20°C

18.7°C + 20°C = Final T° → 38.7°C

Answer:

Weather is the condition of Earth’s atmosphere at a particular time and place, whereas climate is the characteristic weather in an area over a long period of time.

Explanation:

Weather and climate are two very important conditions that describes the atmospheric overview of a place.

Weather is reported over a short period of time, it is the condition of the atmosphere at a particular time and place.

Climate is reported over a long period of term. The average weather condition of a place over a long period of time is the climate.

Answer:

A. car moving down the highway

Explanation:

Potential energy is when the energy is being held in, as in, it is very still, and not moving.

When a car is moving down a highway, it is releasing kinetic energy, instead of potential.

Answer:

The answer is "[tex]\bold{Cl_4}[/tex]"

Explanation:

Please find the complete question in the attachment file.

In this question, it uses the Chemical equations, which is also known as the order to comply with the Law on Mass Conservation, substances must be balanced wherever volume cannot be generated or lost. This should be reacted that the reaction weight becomes equal to a product mass.

Answer:

products

Explanation:

In chemistry, chemical reactions is the combination of two or more substances to yield other substances. The substances that react is called REACTANTS while the substances formed after the reaction is called PRODUCTS.

According to this question, a mixture of oxygen and hydrogen is ignited in a test tube as follows:

Hydrogen + Oxygen → Water + Energy

In this reaction, the substances being combined (usually found on the left side of the equation) are hydrogen and oxygen. Hence, oxygen and hydrogen are REACTANTS. Also, the substances produced as a result of the reaction is water (H2O). The PRODUCTS of the reaction is WATER.

Answer:

Soy isk polq ja uso??

Explanation:

Na uend qoaki uwsh.. aju qah!

Answer:

c is the answer

Explanation: just answerd it and got it correct

Ansewer : nucleus

The number of protons in the nucleus determines which element an atom is, while the number of electrons surrounding the nucleus determines which kind of reactions the atom will undergo. The three types of subatomic particles are illustrated below for an atom of helium—which, by definition, contains two protons.

pH 3 = 10 times of pH 4 in terms of H⁺ concentration

pH is the degree of acidity of a solution that depends on the concentration of H⁺ ion. The greater the value the more acidic the solution and the smaller the pH.

pH = - log [H⁺]

So that the two quantities between pH and [H⁺] are inversely proportional because they are associated with negative values.

A solution whose value is different by n has a difference in the concentration of H⁺ ion of 10ⁿ.

So pH 3 and pH 4 have a difference in the concentration of H⁺ ion of 10¹ = 10

pH 3 = -log[10⁻³]

pH 4 = - log[10⁻⁴]

pH 3 = 10 times of pH 4 in terms of H⁺ concentration

And pH 3 is stronger in acid than pH 4

Answer:

It shows no regular pattern

Explanation:

Physical properties of an element are those we can observe and feel with our senses. Also, the use special equipment can enhance our perception of these properties.

Answer: They lose them :)

Explanation:

Answer:

The correct options are;

1) Hierarchical

2) Frustration

3) Attraction

4) Gative

5) Bridging

Explanation:

A career can be defined as a person's trade or occupation, which he or she engages and progresses in for a considerable portion of his or her life

When a person is engaged in a career that is not best suited to them can therefore lead to frustration, due to the length of time required in building a career

Agriculture, veterinary and nursing are mainly hands on or time input (for agriculture) careers, that seek to attract young people

The existence of poor health and safety conditions in an organization limits the advancement of individuals in their chosen career within the organization

Therefore, we have;

Career is a sequence of related jobs arranged in a hierarchical order

Wrong choice of career may lead to frustration

Agriculture, veterinary, and nursing provide better attraction to young people

Poor health and safety conditions in an organization causes gative effect on the choice of career

The essence of career planning is the bridging of individual with organizational goal.

Answer:

A

A pulley changes the direction of your force, but requires a greater input force.

Explanation:

A pulley changes the direction of your force, but requires a greater input force when machine does work. so option A is correct.

Any tool that makes work easier is a machine. We can complete tasks with the aid of machines by using less force and energy.

By using a simple machine, you can move anything with less effort, but you have to move it farther to do the same amount of labor.

Our bodies function like machinery. For instance, our arms can be compared to a machine that can be utilized to quickly lift objects.

By using a machine to perform work, either the force or the distance across which the force is delivered may rise, but not both at once. In other words, as one grows, either force or distance, the other must decrease. The force-distance trade off is what is meant by this.

Thus, option A is correct.

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Answer: Lanthanide or Lanthanides

Explanation: Sorry that I don’t have an explanation. I just answered the question correctly myself. <33

The lanthanide and actinide are present in the periodic table as a transition metals.

Periodic table is defined as a tabular arrangement of chemical elements ordered by increasing atomic number and element groups.

The latest periodic table has an ordered grouping of the 118 known chemical elements.

Lanthanide is defined as any of the elements with rising atomic numbers beginning with lanthanum or cerium and ending with lutetium.

Lanthanide are rarely found on earth i.e. they are called rare earth metals.

Actinide is defined as any of the elements with increasing atomic numbers beginning with actinium or thorium and ending with lawrencium.

Actinide are the radioactive metals.  

Thus, the lanthanide and actinide are present in the periodic table as a transition metals.

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Answer:

Compound: A substance that is made up of more than one type of atom bonded together.

Mixture: A combination of two or more elements or compounds which have not reacted to bond together; each part in the mixture retains its own properties.

Explanation:

The different substances in a mixture are not chemically combined, whereas the different elements in a compound are. The atoms do not combine in the mixture, but they combine when they form a compound.