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sodium (Na)
boron (B)
O magnesium (Mg)
lithium (Li)
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An atom of element X has one more shell of electrons than an atom of beryllium, but it has one less valence electron
than beryllium. Which element is element X?
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Considering the definition of empirical and molecular formula, the isomer of a compound with an empirical formula of C₂H₆O₂ is C₄H₁₂O₄.

The empirical formula is the simplest expression to represent a chemical compound, which indicates the elements that are present and the minimum proportion in whole numbers that exist between its atoms, that is, the subscripts of chemical formulas are reduced to the most integers. small as possible.

The molecular formula is the chemical formula that indicates the number and type of different atoms present in the molecule. The molecular formula is the actual number of atoms that make up a molecule.

The molecular formula of a compound can be the same as its empirical formula or a multiple of it. So by simplification, the simplest possible integers are found, so as to find the empirical formula.

The given isomer of a compound is C₄H₁₂O₄. For this isomer, simplifying (dividing by 2) the corresponding ratios between the elements, you get the empirical formula C₂H₆O₂.

In summary, the isomer of a compound with an empirical formula of C₂H₆O₂ is C₄H₁₂O₄.

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The amount, in mL, of the suspension that should be given to an infant weighing 17 lb will be 1.16 mL

0.8 mL of the liquid contains 80.0 mg of the drug.

The recommended dose is 15 mg per kg of body weight

The infant to be given the drug weighs 17 lb.

First, let's convert the weight of the infant to kg.

1 lb = 453.59 g

17 lb =       453.59 x 17/1

                   = 7711.03 g

1000 g = 1 kg

7711.03 g = 7711.03 x 1/1000

               = 7.711 kg

So, the baby's weight is 7.711 kg.

The drug dose for the baby can thus be calculated as:

15 mg x 7.711 = 115.67 mg

But 0.8 mL of the drug contains only 80.0 mg. How many mL will contain 115.67 mg?

                   0.8 x 115.67/ 80.0 = 1.16 mL

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U.S. Census Bureau changed the way it records information about relationships by increasing the number of relationship categories to include same-sex partner options and is denoted as option B.

This is a close connection between people and is characterized by physical or emotional intimacy.

There has been changes in the way U.S. Census Bureau records information is recorded in this aspect by  increasing the number of relationship categories for inclusiveness of other types of people such as those who have same-sex partners and so on.

This is therefore the reason why option B was chosen as the correct choice.

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The pOH of the 0.001 M NaOH solution is approximately 3.

To determine the pOH of a solution, we need to know the concentration of hydroxide ions (OH-) in the solution.

In the case of a 0.001 M NaOH solution, we can assume that all of the NaOH dissociates completely in water to form Na+ and OH- ions. Therefore, the concentration of hydroxide ions in the solution is also 0.001 M.

The pOH is calculated using the equation:

pOH = -log[OH-]

Substituting the concentration of hydroxide ions, we have:

pOH = -log(0.001)

Using a calculator, we can evaluate the logarithm:

pOH ≈ 3

Therefore, the pOH of the 0.001 M NaOH solution is approximately 3.

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Answer:

0.278 mol

Explanation:

Step 1: Given and required data

Mass of acetic acid (m): 16.7 g

Chemical formula of acetic acid: CH₃COOH (C₂H₄O₂)

Step 2: Calculate the molar mass (M) of acetic acid

We will use the following expression.

M(C₂H₄O₂) = 2 × M(C) + 4 × M(H) + 2 × M(O)

M(C₂H₄O₂) = 2 × 12.01 g/mol + 4 × 1.01 g/mol + 2 × 16.00 g/mol = 60.06 g/mol

Step 3: Calculate the number of moles (n) of acetic acid

We will use the following expression.

n = m/M

n = 16.7 g/(60.06 g/mol) = 0.278 mol

Answer: c. Sugar turning black when it burns.

Explanation:

Chemical change is defined as a change in which rearrangement of atoms take place and leads to formation of new substances.  

Physical change is defined as a change which leads to change in shape, size or state of the substance changes. No new substance is formed.

a)  Water bubbling when it starts to boil is a physical change as it accompanies only a change in phase.

b) Detergent removing grease from a dish is a physical change as no new substance is formed.

c) Sugar turning black when it burns is a chemical change as there occurs a chemical reaction between sugar and oxygen. The oxygen in the air reacts with the sugar and the chemical bonds are broken.

d) Oil and vinegar separating in salad  dressing is not a chemical change. It occurs because of difference in densities.

The diagrams that shows the repeating groups of atoms that make up the samples which were mixed together is option D.

A chemical reaction is said to have occurred when there a rearrangement of atoms in a substance. This rearrangement of atoms in the substance leads to the formation of new substances.

In this case, we must note that the combination of reactants to be chosen must posses the atoms shown as part of the one of the end substance. The only option that satisfies this requirement is option D.

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Answer:D

Explanation:DDDDD

Answer:

B. Chemically reactive

Explanation:

A Chemically reactive element is an element that is likely to combine with another element to form new substances

The reactivity of the element depends on the number of electrons in the outermost energy level and even the distance of the outermost energy level from the nucleus.  From the periodic table, Fluorine is the most reactive non-metal while francium is the most chemically reactive metal

Answer:

b. Iron forms complexes with molecular oxygen in proteins like hemoglobin and myoglobin

c. Iron rusts readily in moist air.

d. Iron powder dissolves in an acidic solution with the evolution of a gas.

Explanation:

The chemical properties of an element is the property of the element that is being noticed during or after a chemical reaction. The chemical properties can only be observed when the chemical composition of the compound is about to be changed or is changed. From the question the propeties that are chemical are:

Iron forms complexes with molecular oxygen in proteins like hemoglobin and myoglobin

Iron rusts readily in moist air.

Iron powder dissolves in an acidic solution with the evolution of a gas.

The remaining properties are physical properties (they can be measured and shows the physical state)

One weakly bound intermediate is formed between the oxygen atom of O3 and one of the nitrogen atoms of NO, and another weakly bonded is formed between the oxygen atom of O3 and the nitrogen atom of NO.

The bond between nitrogen and oxygen in NO is partially broken, while the bond between the two oxygen atoms in O3 is also partially broken. The bonds between nitrogen and oxygen in NO2 and between the two oxygen atoms in O2 are partially formed.

Nitric oxide and ozone then easily combine to form nitrogen dioxide and oxygen. No net ozone gain occurs as a result of the technique mentioned above. Concentrations are higher in the troposphere than can be explained by these processes alone.

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The angles as shown are supplementary angles because the add up to 180 degrees.

Two angles are said to be supplementary if they add up to 180 degrees. Now we know that the sum of angles on  straight line is 180 degrees. If we look at the image as shown in the image attached, we can see that the angles lie on a straight line.

As such, we can conclude that the angles as shown are supplementary angles because the add up to 180 degrees.

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0.01 mol/L is the molarity of given solution. 0.002 moles is added to 0.2 L solvent to make desired solution.

The amount of moles of solute found in a specific number of litres of the solution, or moles per litre of a solution, is known as molar concentration or molarity. Solutes are simply substances that can be found in solutions because a solution is defined as a homogenous mixture that comprises one or more solutes.

molar mass =342g /mol

number of moles=mass of solute / molar mass

0.45 /342 =0.002 moles

Volume solution =  50 mL / 1000 =0.2 L

M = n / V

M = 0.002 / 0.2

M = 0.01 mol/L

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Answer: Speed is speed, or how fast something is going, while velocity is speed or how fast something is going in a specific direction. Average speed is the speeds added up and divided by number of speeds, and you do the same thing to calculate average velocity.

Answer:

I literally got this from google.

Explanation:

In ordinary air, sodium metal reacts to form a sodium hydroxide film, which can rapidly absorb carbon dioxide from the air, forming sodium bicarbonate. ... In a comparatively dry atmosphere, sodium burns quietly, giving off a dense white caustic smoke, which can cause choking and coughing.

Happy almost Halloween! :)

Based on the given reactions, the compounds are as follows:

A: The specific product formed from the reaction between prop-1-yne and either 2HBr or H2O2.

B: The product formed when compound A reacts with 2H2O.

C: The product formed when compound B reacts with K2CO3(aq).

D: The product formed from the heat-induced reaction of compound C.

E: The product formed when compound D reacts with HBr.

Based on the given reactions, let's analyze the compounds involved:

Reaction 1: prop-1-yne + 2HBr/H2O2 = A

The reactant prop-1-yne reacts with either 2HBr or H2O2 to form compound A. The specific product formed will depend on the reaction conditions.

Reaction 2: A + 2H2O = B

Compound A reacts with 2H2O (water) to form compound B.

Reaction 3: B + K2CO3(aq) = C

Compound B reacts with K2CO3(aq) (potassium carbonate dissolved in water) to form compound C.

Reaction 4: C + heat = D

Compound C undergoes a heat-induced reaction to form compound D.

Reaction 5: D + HBr = E

Compound D reacts with HBr (hydrobromic acid) to form compound E.

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Answer:

To convert joules to calories, you can use the conversion factor:

1 calorie = 4.184 joules

To find out how many calories are in 4,180 joules, divide the given value by the conversion factor:

4,180 joules / 4.184 joules per calorie = 0.9 calories (approximately)

Therefore, there are approximately 0.9 calories in 4,180 joules.

Answer:

Gallium (Ga)

Explanation:

Gallium (Ga) is the element which is represented by the given electron configuration since the total number electron is 31.

A material that cannot be destroyed chemically is referred to as a chemical element. Although chemical processes cannot modify an atom, nuclear reactions can create new elements. The quantity of protons an element has defines it. An element's atoms all contain the same amount of protons, but its electron and neutron counts might vary. Ions are produced by altering the electron to proton ratio, whereas isotopes are produced by altering the neutron count. Since there are 31 total electrons in the universe, gallium (Ga) gets the element that is denoted by the specified electron configuration.

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Answer:

Electricity, Weapons, Medicine · Food Treatments, ect.

Answer:

\(K=1.98x10^{3}\)

Explanation:

Hello,

In this case, for the reaction:

\(2A(aq)+3B(g)+C(l)\rightleftharpoons 2D(s)+3E(g)\)

We notice it is undergone as heterogeneous equilibrium, that is why, for the thermodynamic equilibrium constant we consider the aqueous species only, that is the concentration of A to the second power (stoichiometric coefficient) only:

\(K=\frac{1}{[A]^2}\)

Thus, the equilibrium constant turns out:

\(K=\frac{1}{(2.25x10^{-2})^2}\\ \\K=1.98x10^{3}\)

Clearly, B, C, D and E are not considered as they are gaseous, liquid, solid and gaseous respectively, and based on the procedure to write the law of mass action, they are not considered due to different phases.

Best regards.

Answer:

0.016 m³

Explanation:

Step 1: Given data

Width of the tank (w): 18 in

Height of the tank (h): 11 in

Depth of the tank (d): 5 in

Step 2: Calculate the volume of the tank in in³

The fuel tank is a cuboid. We can calculate its volume using the following expression.

V = w × h × d

V = 18 in × 11 in × 5 in

V = 990 in³

Step 3: Convert 990 in³ to m³

We will use the relationship 1 m³ = 61023.7 in³.

990 in³ × (1 m³ / 61023.7 in³) = 0.016 m³

Answer:

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Explanation:

tanga bobo potang Ina mo

Answer:

12.125 moles of Z

Explanation:

Hi! Here, since you only know the number of moles for one of the reactants, you will use the coefficients in the reaction to use the mole ratio to find your answer. Since the question states that there are 4.85 mol A and excess B, A is your limiting reactant. This means that once all of the A is used up in the reaction, you will have your maximum amount of Z left behind because there will only be B left and no A to make more Z.

The mole ratio of A:Z is 2:5, found from the coefficients in the chemical equation(2 moles of A for every 5 moles of Z).

So, start with the information that is given to you (4.85 mol A) and then use the mole ratio, like this:

4.85 mol A(\(\frac{5 mol Z}{2 mol A}\))

This way, the mol A will cancel out, leaving behind mol Z (always put the unit you are looking for on top).

Doing this leads to mol Z = 12.125 mol.

I hope this helps! Good luck with your finals!

As per the given 4.85 moles of A will produce 12.125 moles of Z, assuming excess B.

A chemical reaction is the transformation of one or more substances, known as reactants, into one or more different substances, known as products.

Chemical reactions involve the breaking and forming of chemical bonds between atoms and molecules, causing atoms to rearrange and the chemical and physical properties of the substances involved to change.

From the balanced chemical equation, we can see that 2 moles of A react with 3 moles of B to produce 5 moles of Z.

So the mole ratio of A to Z is 2:5.

Therefore, if 2 moles of A react to produce 5 moles of Z, then 4.85 moles of A will produce:

(4.85 mol A) x (5 mol Z / 2 mol A) = 12.125 mol Z

Thus, 4.85 moles of A will produce 12.125 moles of Z, assuming excess B.

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In IR spectroscopy, a sample of a molecule is irradiated with light in the IR portion of the electromagnetic spectrum. The energy of the infrared radiation after it has passed through the sample is then measured.

A decrease in the energy of a particular wavelength indicates that the molecule has absorbed this energy by undergoing some type of vibration. This is because when a chemical bond stretches and contracts, it vibrates at a specific frequency, which corresponds to a specific wavelength in the IR region of the electromagnetic spectrum. When the sample absorbs IR light at a specific frequency, it causes the bond to vibrate, consuming energy. An IR spectrum is a plot of the energy of the transmitted radiation as a function of the frequency of the infrared radiation. The plot appears as a series of peaks, each of which corresponds to a specific bond vibration in the molecule. The position and intensity of these peaks can provide information about the types of bonds and functional groups present in the molecule.

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Balance the half-reactions to guarantee that the number of electrons transferred in both reactions is the same:

NO3- + 8H+ + 10e- N2 + 4H2O H2 2H+ + 2e- NO3- + 8H+ + 10e-

The next step is to figure out how many electrons are moved when 145 molecules of H2 are oxidized. We can see from the balanced equation for the H2 half-reaction that 1 molecule of H2 makes 2 electrons:

2H+ + 2e- → H2

As a result, 145 molecules of H2 will yield:

145 molecular units H2 has two protons per molecule. 290 electrons Equals H2

Finally, we can use the denitrification reaction balanced equation to calculate how many molecules of N2 are created for 290 electrons:

1 molecule of N2 is produced by 10 electrons.

Therefore, 1 molecule N2 290 electrons/10 electrons = 29 molecules N2

29 molecules of N2 gas will be created.

To answer the second query, we must balance the half-reactions:

SO42- + 8H+ + 8e- H2S + 4H2O CO2 + 8H+ + 8e- CH3COO- + 2H2O SO42- + 8H+ + 8e- H2S + 4H2O

The balanced formulae show that 8 electrons are transferred in both half-reactions. As a result, in order to oxidize 48 molecules of CH3COO-, 6 molecules of SO42- must be reduced:

There are 48 nuclei CH3COO- 8 electrons per atom 384 protons = CH3CO-

384 electrons (eight electrons per atom) 48 units of SO42- SO42-

As a result, 48 molecules of CH3COO- reduced to CO2 will yield:

six electrons 4 H2O/molecule SO42- 24 units of SO42- H2O

The answer is that 24 molecules of water will be created.

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Answer:

Explanation:

These numbers are all approximate. You will have to consult your text to get exact numbers.

density = mass (grams)/ volume(mL)

density of water = 1 gram / 1 mL

given volume = 30 mL

mass = ?

density = mass / volume

1 = mass / 30 mL

mass = 1 * 30 mL = 30 grams

1 mol of water = 18.02 grams (2 * 1.01 + 16)

x mol of water = 30 grams

18.02 * x = 1 * 30

x = 30/18.02

x = 1.66 mol

Note this is the answer to the question that asks how many mols are in 30 mL of water.

1 mol of anything is 6.02 * 10^23 parts

1.66 mol = x

1*x = 1.66 * 6.02*10^23

x = 1.0022 * 10^24 particles

Answer: there are 1.0022*10^24 molecules of water in 30 mL of water

Answer:

A green liquid becoming a red liquid.

Explanation:

If the color change is unexpected it is a chemical change.

(If 2 clear liquids make a black, red, green, ect color it is a chemical change)

no normal color mix makes green turn red.

Answer:

The same amount of matter exists before and after the change—none is created or destroyed. This concept is called the Law of Conservation of Mass.

In a physical change, a substance's physical properties may change, but its chemical makeup does not.

Explanation:

Answer:

It causes erosion of the land and stones.

Explanation:

if the objects such as stones etc are present in the way of stream so the stones are eroded due to its fast flowing due to sloppy nature. If the stream is flat  then it little disturb the things present in its way because of its lower speed. If more rainfall occur the streams flows in higher speed and destroy everything that comes in its way and also affected the plains.

Answer:this is correct

Explanation: