which is the best definition of a molecule

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.

The potential energy of a bird : 196 J

Given

mass of bird = m = 2 kg

height = h = 10 m

Required

The potential energy

Solution

Potential energy is the energy that objects have because of their position. Usually related to the earth's gravitational force

Can be formulated

PE = m g h

g = acceleration due to gravity ⇒ 9.8 m/s²

Input the value :

PE = 2 kg x 9.8 m/s² x 10 m

PE = 196 J

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.)

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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Answer:

The chain of colored boxes represent the first eight amino acids in the beta chain of hemoglobin. The sixth position in the normal beta chain has glutamic acid, while sickle beta chain has valine. This is the sole difference between the two

Explanation:

Answer:

what do you mean?

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:

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:

False

Explanation:

It is the opposite. A good way to remember is the that the dependent variable depends on the independent variable.

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:

1) alr balanced

2) 2 2 1

3) 2 1 1 2

4) 2 3 2

5) 2 1 2 1

6) 1 6 2 3

7) 2 2 1

8) 1 2 1 2

9) 2 5 4 6

10) 3 1 2

Answer:

B

The increase in the atomic number

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:

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:

Lime

Explanation:

Answer:

Metals

Explanation:

All these are metals

Answer:

B: It is metals.

Explanation:

Look at your periodic table to locate iron, gold, and tin.

Iron is Fe

Gold is Au

Tin is Sn

They are all located in the transition metals area.

So the chemicals are metals.

Hope it helped!

Answer:anser choices

Explanation:

Answer:oxygen hahah

Explanation:

Answer:

Y because organism y feed on herbivores

Explanation:it means y is carnivores or omnivores

Explanation:

Answer:

Well ice cubes are normally liquids but it is frozen water making it a solid. Since they are made of water particles, they wouldn't normally be a solid, but the particles are packed close enough together to make it one. Hope this helps! :D

Explanation:

Answer:

The answer is choice (4)

Explanation:

Laker in 5 !!!

The substance with the greatest molecular mass is I₂.

The molecular mass is the sum of the atomic masses of all atoms in a molecule

Let's calculate the molecular mass of each compound to know the greatest.

molecular mass of H₂O₂ = 2 + 32 = 34 g/mol

molecular mass of CF₄ = 12 + (19 × 4) = 12 + 76 = 88 g/mol

molecular mass of NO = 14 + 16  = 30 g / mol

molecular mass of I₂ = 127 × 2 = 254 g/mol

Therefore, the substance with the greatest molecular mass is I₂.

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Answer:

30 Ohms (Ω)

Explanation:

Resistance = Voltage/Current

R = 6/0.2

R = 30 Ohms (Ω)

Answer: It most likely represents a canyon.

Answer:

[tex]\boxed {\boxed {\sf 0.6692 \ mol \ AlCl_3}}[/tex]

Explanation:

To convert from grams to moles, we must use the molar mass. This can be calculated using the Periodic Table.

1. Molar Mass

First, identify the elements in the compound AlCl₃. They are aluminum and chlorine. Now find the masses:

Take a look at the compound. There is a subscript of 3 after chlorine, so we must multiply its molar mass by 3 then add aluminum's.

2. Convert Grams to Moles

We can use the molar mass as a ratio.

[tex]\frac{133.331538 \ g \ AlCl_3}{1 \ mol \ AlCl_3}[/tex]

Multiply by the given number of grams: 89.23

[tex]89.23 \ g \ AlCl_3 * \frac{133.331538 \ g \ AlCl_3}{1 \ mol \ AlCl_3}[/tex]

Flip the fraction so the grams of aluminum chloride cancel out.

[tex]89.23 \ g \ AlCl_3 * \frac{1 \ mol \ AlCl_3}{133.331538 \ g \ AlCl_3} = 89.23 \ * \frac{1 \ mol \ AlCl_3}{133.331538}[/tex]

[tex]\frac{89.23 \ mol \ AlCl_3}{133.331538}[/tex]

[tex]0.6692340112 \ mol \ AlCl_3[/tex]

3. Round

The original measurement of grams has 4 significant figures. We must round to 4 sig figs.

For the number we calculated, that is the ten thousandth place.

The 3 in the hundred thousandth place tells us to leave the 2.

[tex]0.6692 \ mol \ AlCl_3[/tex]

There are about 0.6692 moles of aluminum chloride in 89.23 grams.

Answer:

brain

Explanation:

The central nervous system (CNS) controls most functions of the body and mind. It consists of two parts: the brain and the spinal cord. The brain is the center of our thoughts, the interpreter of our external environment, and the origin of control over body movement.

Answer:

OC brain, due to the brain being basically the smarts of your body, combined with it also managing, important functions of the body

Explanation:

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.