Which two elements will be the most alike and why?




Which two elements will be the most alike and why?





Lithium (Li) and Sodium (Na) because they are both metals and are in the same group

Oxygen (O) and Neon (Ne) because they are both noble gases

Helium (He) and Hydrogen (H) because they are both non-metals and are in the same row.

If enough HCl is not added, the percent yield will be lower as all the magnesium metal has not reacted with HCl.

The percent yield of a reaction is the ratio of the actual yield and the expected yield expressed as a percentage.

The reaction between magnesium metal and HCl liberates hydrogen gas and forms magnesium chloride salt.

If enough HCl was not added to react with all the magnesium metal, the actual yield will be lower.

Hence, percent yield will be lower as well.

Therefore, the percent yield will be lower if all the magnesium metal has not reacted with HCl.

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Answer: aragon is in group 0

2. It’s a non metal

3. Group number

Explanation:

Answer:

This is because it is a physical change not a chemical change.

The molecular formula of the compound that has a percent composition of 38.7% carbon, 9.76% hydrogen, 51.5% oxygen is C2H6O2.

The molecular formula can be calculated from the empirical formula. The empirical formula of the compound is calculated as follows:

Next, we convert the mass to moles by dividing by their atomic mass:

Next, we divide by the smallest (3.22)

Hence, the empirical formula of the compound is CH3O

If the molar mass of the compound is 62g/mol;

(CH3O)n = 62

31n = 62

n = 2

(CH3O)2 = C2H6O2

Therefore, the molecular formula of the compound that has a percent composition of 38.7% carbon, 9.76% hydrogen, 51.5% oxygen is C2H6O2.

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Answer:

the heat flows from the hand to the ice cream

Explanation:

we produce body heat therefore it moves to the ice cream also there is no possible way the heat could move from the ice cream because the ice cream is cold

Heat flows from the hand to the ice cream. Therefore, the correct option is option B among all the given options.

When the temperature rises, a type of energy called thermal energy is produced. The amount of thermal energy usually directly inversely proportional to the object's change in temperature. Thermal energy takes the form of heat. The thermal energy of a substance increases with temperature.

The quicker movements of the substance's atoms and molecules are what cause thermal energy to rise as temperature rises. In some cases, a substance's molecules will separate from one another and leave because the temperature has such high. Unexpectedly, thermal energy also affects the states of matter. Heat flows from the hand to the ice cream.

Therefore, the correct option is option B.

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As temperature increases, the average kinetic energy of a sample of gas molecules decreases.

Answer:

2.1×6.02×1023÷ 14

9.03×1022 atom of nitrogen

Explanation:

Answer:

Phosphorus

Explanation:

Actually that's red Phosphorus

Answer:

Option B. ( Phosphorus)

Explanation:

Here, we want to select the option which is the main component present in the striking surface of a matchbox

The correct choice here is phosphorus

Red phosphorus which is an allotrope of phosphorus finds use in this particular case. It is the main chemical component present in the striking surface of a matchbox.

Hope this helps!

If you have any queries please ask.

Answer:

Hydrogen

Explanation:

Hydrogen number one on the periodic table is on the left side and is a non metal gas.Hydrogen is on the left side because like members of the IA group containing Lithium, Sodium and Potassium it has a normal charge of +1.

Answer:

I believe it is Hydrogen

Explanation:

Answer:

Ammonia and oxygen without catalyst | NH3 + O2 → N2 + H2O. With supply of heat, ammonia reacts with oxygen and produce nitrogen gas and water as products. Nitrogen of ammonia is oxidized to nitrogen gas from -3 oxidation state to 0 oxidation state.

Explanation:

Answer:

Chemical formula of Oxygen is O2.

We know ,

1 mole of a substance contains 6.022×10^23, Avogadro’s Constat.

Here, Molar mass of O = 16u

And molar mass of O2 = 32u

And 32g of O2 = 1 mole of O2

It means that,

32g of O2 = 6.022×10^23 molecules

Answer:

The correct answer is given in the picture

This ANSWER IS ONLY CORRECT WHEN Oz STAND FOR OZONE

Answer:

In a redox reaction, electron could be lost or gained. The coefficients in the balanced redox reaction are;  1/2, 5, 1, 5, 2, 1.

A redox reaction equation shows the species that were oxidized or reduced in a redox reaction. In this case, we are asked for the coefficients in a balanced redox reaction equation.

We must recall that five electrons were lost/gained in the process hence the balanced reaction equation is;

1/2I2 + 5HNO3 -----> IO3^- + 5NO2 + 2H2O + H^+

The coefficients in the balanced equation therefore are; 1/2, 5, 1, 5, 2, 1.

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The following redox equation is balanced with the smallest whole number coefficients, the coefficient for nitrogen dioxide will be 10.

In redox reaction, there is transfer of electrons between the species of the reactions.

The given redox reaction is

[tex]\rm I2 (s) + HNO_3 (aq) -- > HIO_3 (aq) + NO_2 (g) + H_2O[/tex]

To find coefficient of the compounds of the reaction, there are coefficient calculator present.

Thus, the coefficient for nitrogen dioxide will be 10.

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Answer:

True

Explanation:

Since the waves have low frequency that means the wavelength is going to be longer. Hope this helps

The molar mass of this compound is 0.004 m/g

Firstly, molar mass is moles/grams so we need to solve for the number of moles and we were already given the grams (205 g).

So to solve for moles we were given 205 g, 20.0 L, 273 K and 1.00 atm. Knowing these numbers we can plug them into the ideal gas law, PV=nRT

where P is pressure, V is volume, n is number of moles, R is the gas constant (in this case it is 0.08206) and T is the temperature.

[tex]PV=nRT\\\\n=\frac{PV}{RT}\\\\n=\frac{1.00*20.0}{0.08206*273} =0.893[/tex]

Next, we use moles and grams to solve for molar mass:

[tex]\frac{0.893}{205} =0.004[/tex]

Bedrock is used in the construction of structures, the topsoil is important for the production of crops and the loss of fertile soil is known as desertification.

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Answer:

1. Bedrock

2. Topsoil

3. Desertification

Explanation:

Owing to the fact that allene is not a planar molecule, the hydrogen atoms in the molecule do not lie on the same plane.

A planar molecule refers to those molecules that lie on same plane. This means that the atoms in the molecules are all arranged along the same plane.

Now we know that the molecule allene is not a planar molecule. Owing to the fact that allene is not a planar molecule, the hydrogen atoms in the molecule do not lie on the same plane. All the carbon atoms present are sp2 hybridized.

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Salts such as [tex] Na_{2} SO_{4}[/tex] are used in softening of hard water.

Hardness of water is the presence on water of dissolved metallic ions such as calcium and magnesium ions results in the water having additional properties such as taste.

Hardness of water is of significance in the laundry industry as it causes water to lather with difficulty and also produces sc_um.

To remove hardness of water or to soften water, salts such as [tex] Na_{2} SO_{4}[/tex] are used.

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A 33.0-L container at 96.2 kPa and 35 °C contains 1.24 moles of oxygen.

An ideal gas is a hypothetical gas whose molecules occupy negligible space and have no interactions, and which consequently obeys the gas laws exactly.

First, we will convert 35°C to Kelvin using the following expression.

K = °C + 273.15 = 35 + 273.15 = 308 K

We want to calculate the number of moles of oxygen in a 33.0-L container at 96.2 kPa and 308 K. We will use the ideal gas equation.

P × V = n × R × T

n = P × V / R × T

n = 96.2 kPa × 33.0 L / (8.31 l.kPa/mol.K) × 308 K = 1.24 mol

where,

A 33.0-L container at 96.2 kPa and 35 °C contains 1.24 moles of oxygen.

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Molten cryolite is the substance which serves as an electrolyte in the diagram.

This is defined as a substance that conducts electricity when dissolved in water.

Molten cryolite serves as the electrolyte as it helps dissolve molten aluminium oxide and increases the conductivity of the solution which was why it was chosen as the most appropriate choice.

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Answer: Molten cryolite

Explanation: Molten cryolite serves as the electrolyte as it helps dissolve molten aluminium oxide and increases the conductivity of the solution which was why it was chosen as the most appropriate choice.

Answer:

products, it's answer A.

Answer:

products

Explanation:

The new pressure of gas when the volume of the gas is increase to 321 L at 125 °C is 212.46 torr

How to determine the new pressure

The new pressure of the gas can be obtained by using the Boyle's law equation since the temperature is constant. This is illustrated below:

P₁V₁  = P₂V₂

248 × 275 = P₂ × 321

68200 = P₂ × 321

Divide both side by 321

P₂ = 68200 / 321

P₂ = 212.46 torr

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Answer:

50W

Explanation:

The formula and is

W = F × s

(force x distance)

W= 50 N× 5 m =250 N m=250 J

Done in 5 seconds the power is

p

=

W

t

where

t

=time

p

=

250

J

5

=

50 J

/s

=50 W

Answer:

Maybe 250 newtons

Explanation:

Answer:

can you show us the list

Explanation:

Answer:

the N at the top is north bottom is south w on your left is west and e of your right is east

The single most important factor influencing potassium ion secretion is its concentration in blood plasma.

This is the liquid portion of the blood and serves as the transport medium for nutrients in the body.

When there is a high concentration in the plasma, it maximizes the concentration gradient which favors its secretion into the urinary fluid.

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The single most important factor influencing potassium ion secretion is concentration.

This is the liquid part of the blood present in the body and it transports nutrients throughout the body.

Whenever in the body there is high concentration of potassium ion as a result of which concentration gradient increases which in turn favors the secretion of potassium ion into the urinary fluid.

Hence concentration is the important factor.

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Answer:

Ammonium carbonate is a neutral molecule. Charge on NH4 is +1 , so on (NH4)2 is +2 ( +1 * 2) ,lets take the charge on C to be x and O is -2 , so on O3 is -6 (3*-2). Therefore x= + 4. Hope it helps.

Explanation:

Agar is used as a solidifying agent in culture media instead of gelatin because it readily melts and it contains no nutrition for bacteria cultures.

Agar is a gelatinous material obtained from red algae and used in the preparation of culture medium.

Agar is used to solidify the culture medium for bacteria growth, although, gelatin can also be used.

However, agar is preferred as a solidifying agent in culture media instead of gelatin because it readily melts and it contains no nutrition for bacteria cultures.

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Answer:

So that we know how many electrons are thre in which shell and how many shells are present in an atom....

Explanation:

Hope it helps!!!

Forces can cause objects to accelerate , decelerate , stop , start moving , change direction , change shape , or even turn