i swear if someone helps me with this I’ll give them the biggest hug lol

The mass number of an atom : 26

Given

12 protons, 14 neutrons, and 12 electrons

Required

The mass number

Solution

Inside the atom there are 3 sub-particles, namely protons, neutrons and electrons. Protons and electrons are present in the atomic nucleus while electrons move around the atomic nucleus through energy levels in the atomic shell

Atomic number = number of protons = number of electrons

Mass number = number of protons + number of neutrons

Input the value :

Mass number = 12 + 14

Mass number = 26

Answer:

B

The increase in the atomic number

Answer:

Bird eating worm: The bird gains energy from eating its proteins.

Plant recieving sunlight: The plant gains energy from the sunlight and transfers it into sugar and energy for it to continue its cycle.

Light bulb attached to battery: The lightbulb gains electricity and power from the battery until it runs out completely.

Answer:anser choices

Explanation:

Answer:oxygen hahah

Explanation:

Answer:

Lime

Explanation:

Answer:

change the concentration of one reactant while keeping the other concentrations constant

Explanation:

For a given reaction;

A +  B --> C + D

The reaction rate may be given as;

Rate = k[A][B]

In the above rate equation, the orders of both reactants ( A and B) is 1 . Reaction order is basically how the concentration of the reactant affect the rate of the equation.

The correct option is;

change the concentration of one reactant while keeping the other concentrations constant.

That way, one can monitor how a particular reactant affect the rate of the reaction.

Answer:

A

Explanation:

The dot in the image represents the unshared/ lone pair of electrons. The correct option is D. Dots are written around the element in an equation.

Unshared or lone electrons are those electrons, which are lone and not shared with another atom when making a covalent bond. These electrons are represented by dots. The valence electron help in making the valence complete of other atoms when forming a bond.

The diagram is of water, oxygen has six valence electrons, of which two are shared by hydrogen and four are lone electrons. The lone pairs will be attached to other hydrogen molecules.

Thus, the correct option is D, Unshared/lone pairs of valence electrons regarding the representation of the dots in the image given.

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Answer:

Using the formula cards again, add the coefficient of 2 in front of the formula and have them recalculate the number of each element and the total number of atoms in each element.

Explanation:

The number of elements in a compound is counted by identifying and counting the chemical symbols represented in the chemical formula

A compound is a substance that is a mixture of more than one elements.

Compounds are made of two or more elements. These elements are represented by their symbols. These symbols can be identified and the number of elements represented by these symbols are counted.

For example, in the compound [tex]H_2O[/tex]:

H represents Hydrogen

O represents Oxygen

The elements in Water ( [tex]H_2O[/tex]) are Hydrogen and Oxygen

Therefore, the number of elements in  [tex]H_2O[/tex] is 2

Also in, [tex]NaCl[/tex]

The elements are Sodium(Na) and Chlorine(Cl)

There are two elements in NaCl

Hence, the number of elements in a compound is counted by identifying and counting the chemical symbols represented in the chemical formula

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Answer:

30 Ohms (Ω)

Explanation:

Resistance = Voltage/Current

R = 6/0.2

R = 30 Ohms (Ω)

Answer:

1. accurate but not precise

2. precise but not accurate

3. accurate and precise

4. neither

Explanation:

hope this helps :)

The accuracy is always followed by precision, but a high degree of precision does not imply accuracy. All the accurate results will be definitely precise.

The accuracy of a determination is defined as the concordance between the result and the true value or most probable value. The precision of a determination is known as the concordance of a series of measurements of the same quantity.

The accuracy expresses the correctness of a measurement while precision of a set of results expresses the reproducibility of a measurement.

Accuracy is related to how close the observed result is to the true value while precision is related to how close the measurements are to each other.

The given measurements are denoted as:

1. Accurate but not precise

2. Precise but not accurate

3. Accurate and precise

4. Neither

Thus accurate results will be precise but precise results may not be accurate.

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The volume of unreacted Oxygen = 1.25 L = 1.25 dm³ = 1250 cm³

Given

Combustion of propane

3.6 L CO2

7.25 L O2

Required

The volume of unreacted oxygen

Solution

Reaction

C₃H₈ + 5O₂ ⇒ 3CO₂ + 4H₂O

Avogadro's :  

In the same T,P and V, the gas contains the same number of molecules  

So the ratio of gas volume will be equal to the ratio of gas moles  

Vol O₂ = 5/3 x vol CO2 = 5/3 x 3.6 = 6 L

The unreacted : 7.25 - 6 = 1.25 L

Answer:

A

Explanation:

Answer: My guess would be condensation.

Explanation: Condensation makes water into water droplets.

Answer:

sodium bicarbonate

Answer:

Baking powder

Explanation:

Baking powder is a solid mixture that is used as a chemical leavening agent in baked goods. It can be composed of a number of materials, but usually contains baking soda (sodium bicarbonate, NaHCO3), cream of tartar (potassium bitartrate, C4H5KO6), and cornstarch. (A base, an acid, and a filler respectively.)

Molecular mass of C₂H₄ is,

M = 2×12 + 4×1 g/mol

M = 28 g/mol

Moles of C₂H₄ in 5.6 g of C₂H₄ :

n = 5.6/28 mol

n = 0.2 mol

Now, 1 mol of C₂H₄ contains 2 moles of carbon.

So, number of moles of carbon are :

n = 0.4 mol

We know, 1 mol of any atom contains 6.022 × 10²³ atoms.

So, number of carbon atoms are :

[tex]N = 0.4 \times 6.022\times 10^{23} \\\\N = 2.409 \times 10^{23}[/tex]

Hence, this is the required solution.

Answer:

417.2g

Explanation:

Given parameters:

Number of moles of octane  = 3.66moles

Unknown:

Mass of octane  = ?

Solution:

To solve this problem;

         Octane = C₈ H₁₈

  Mass of octane  = number of moles x molar mass

     Molar mass of octane = 8(12) + 18(1)  = 114g/mol

 Mass of octane  = 3.66 x 114  = 417.2g

Answer:

219.73 g

Explanation:

The molecular formula of zinc (II) oxide is ZnO. This means its molar mass would be:

With that molar mass, we can convert moles into grams:

Answer:

The extraction is done by electolysis but first the aluminium oxide must be melted so that electricity can pass through it...The use of molten cryolite as a solvent reduces some of the Energy

costs involved in extracting aluminum by allowing the ions in aluminum oxide to move freely at low temperature ..

Answer:

it is the objects mass, I learned this last semester

The object's mass has a greater impact on the kinetic energy of an object as it is the mass the mass on which force is exerted and in which energy is stored to be transformed in to kinetic energy.

Force is defined as a cause which is capable of changing the motion of an object. It can cause an object which has mass to change it's velocity. It is also simply a push or a pull . It has both magnitude as well as direction.Hence, it is a vector quantity.

It has SI units of Newton and is represented by'F'.Newton's second law states that force which acts on an object is equal to momentum which changes with time. If mass of object is constant, acceleration is directly proportional to net force acting on an object.

The concepts which related to force are thrust and torque .Thrust increases the velocity of an object and torque produces change in rotational speed of an object.

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Answer:

1 mole of propane combines with 5 moles of oxygen gas to produce 3 mole of carbon dioxide and 4 moles of water.

Explanation:

The word equation for the combustion of propane can be obtained from the chemical equation;

      C₃H₈   +    5O₂    →   3CO₂   +   4H₂O  

The word equation is therefore:

 1 mole of propane combines with 5 moles of oxygen gas to produce 3 mole of carbon dioxide and 4 moles of water.

For such a combustion reaction, carbon dioxide and water are produced in the process.

Answer:

V₂ =  8.43 L

Explanation:

Given data:

Initial number of moles = 2.3 mol

Initial volume = 3.4 L

Final volume = ?

Final number of moles = 5.7 mol

Solution:

According to Avogadro law,

The number of moles of gas is directly proportional to its volume. By increasing the number of moles volume also goes to increase.

Mathematical relationship:

    V₁ / n₁     =    V₂ / n₂

By putting values,

3.4 L / 2.3 mol =  V₂ / 5.7 mol

V₂ =  3.4 L× 5.7 mol / 2.3 mol

V₂ =  19.38 L.mol / 2.3 mol

V₂ =  8.43 L

Answer:

A

Explanation:

I used my resources and they was explaining and I came to a resolution that it was A

There are 37 grams of hydrogen present in the 100 g sample given that compound is composed of 37% hydrogen and 63% oxygen.

MASS OF AN ELEMENT:

According to this question, a compound is said to be composed of 37% hydrogen and 63% oxygen.

This means that in 100g of the compound, its elemental constituents are as follows:

This means that hydrogen will contain 37g in 100g of the given compound.

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