Is F2 and atom or a molecule and is it a pure element or a
compound?
a. Atom, Compound
b. Molecule: Compound
c. Molecule, Pure element

The balanced chemical equation for the reaction between strontium and oxygen can be written as follows: 2 Sr (s) + \(O_2\)(g) → 2 SrO (s).

In this equation, solid strontium (Sr) reacts with gaseous oxygen (\(O_2\)) to produce solid strontium oxide (SrO).

To determine the mass of product expected to form in this reaction, we need to consider the molar ratio between strontium and strontium oxide. From the balanced equation, we can see that 2 moles of strontium react to produce 2 moles of strontium oxide.

The molar mass of strontium (Sr) is 87.62 g/mol, and the molar mass of strontium oxide (SrO) is 119.62 g/mol. Since the molar ratio is 1:1 between strontium and strontium oxide, the mass of strontium oxide formed will be equal to the mass of strontium used.

In this case, the student added 4.93 g of strontium to the crucible. Therefore, the expected mass of strontium oxide formed will also be 4.93 g.

It's important to note that this calculation assumes that the reaction proceeds to completion, meaning that all of the strontium reacts with oxygen. In actual laboratory conditions, the yield of the reaction may be less than 100% due to factors such as incomplete reaction, side reactions, or product loss.

For more such questsion on balanced chemical equation visit:

https://brainly.com/question/11904811

#SPJ8

Answer:

Neutral solutions have an equal number of H+ ions and OH- ions. Acidic solutions have a higher H+ concentration. An acid is a substance that releases H+ when dissolved in water. Basic solutions have a low H+ concentration.

Answer:

Water has both the higher surface tension and viscosity

Explanation:

Water has stronger intermolecular forces

Water has a higher viscosity and surface tension than methanol.

Water has a high melting and boiling point irrespective of its low relative molecular mass because of strong intermolecular hydrogen bonding in the liquid.

This strong intermolecular hydrogen bonding also accounts for its high viscosity and surface tension. Surface tension is a force acting along the surface of a liquid that makes it behave like a stretched elastic skin.

Methanol has a lesser magnitude of intermolecular hydrogen bonding compared to water hence it has less surface tension and viscosity compared to water.

Learn more: https://brainly.com/question/4513132

Answer:

4-methyl-1-pentyne

Explanation:

presence of triple bond(Alkyne)

hope it's clear?

Answer:

0.225 mol = 0.23 mol to 2 significant figures

Explanation:

Calculate the moles of oxygen needed to produce 0.090 mol of water

The equation of the reaction is given as;

2 C2H2 + 5 O2 --> 4 CO2 + 2 H2O

From the equation of the reaction;

5 mol of O2 produces 2 mol of H2O

x mol of O2 produces 0.090 mol of H2O

5 = 2

x = 0.090

x = 0.090 * 5 / 2

x = 0.225 mol

Answer:

Ionic compounds are formed when positive and negative ions share electrons and form ionic bonds. The strong attraction between positive and negative ions often produces crystalline solids with high melting points. When there is a large difference in electronegativity between ions, ionic bonds are formed rather than covalent bonds. Cations, called cations, are listed first in the ionic compound formula, followed by negative ions, called anions.

Stable ionic compounds are electrically neutral in which electrons are shared between cations and anions to complete the outer electron shell or octant. When the positive and negative charges on the ions are the same or "cancel each other", you know you have the right formula for the ionic compound. Here are the steps to write and balance the formula: Identify the cation (the positively charged part). It is the weakest (most positively charged) ion. Cations include metals, which are usually on the left side of the periodic table. Identify anions (negatively charged moieties). It is the most negatively charged ion. Anions include halogens and nonmetals. Remember that hydrogen can carry a positive or negative charge in any way. Write the cation first, then the anion. Adjust the subscripts of the cations and anions so that the net charge is 0. Use the smallest integer ratio between the cations and anions to write the formula to balance the charges. If the cations and anions are of equal charge (eg +1/-1, +2/-2, +3/-3), then combine the cations and anions in a 1:1 ratio. An example is potassium chloride KCl. Potassium (K+) has a 1-charge, while chlorine (Cl-) has a 1-charge. Note that you don't write a subscript of 1. If the charges of the cation and anion are not equal, add subscripts to the ions as needed to balance the charges. The total charge of each ion is the subscript times the charge. Adjusted subscripts to balance charges. An example is sodium carbonate Na 2 CO 3 . The sodium ion has a +1 charge, multiplied by the subscript 2 gives a total charge of 2+. The carbonate anion (CO 3 -2 ) has a 2-charge, so there is no additional subscript. If you need to add a subscript to a polyatomic ion, enclose it in parentheses to clearly apply the subscript to the entire ion rather than individual atoms. An example is aluminum sulfate, Al 2 (SO 4 ) 3 . The parentheses surrounding the sulfate anion indicate that three 2-sulfate ions are required to balance 2 of the 3 charged aluminum cations.

Examples of ionic compounds

Many familiar chemicals are ionic compounds. A metal bonded to a non-metal is the death giveaway of an ionic compound you are dealing with. Examples include salts such as table salt (sodium chloride or NaCl) and copper sulfate (CuSO4).

The question is on evolution, which is the process by which populations of organisms change over successive generations. It is driven by mechanisms such as mutation, genetic recombination, and natural selection.

The correct order is as follows:

The Earth is a molten ball of rock and minerals.

Comets also brought water, adding to what we had.

The water vapor condensed as the Earth cooled and rain fell. This formed the first oceans.

Earth's early atmosphere consists of carbon dioxide, with some water vapor, nitrogen, and traces of methane and ammonia.

The Earth's surface was covered in volcanoes releasing carbon dioxide, water vapor, and nitrogen.

Bacteria first appeared.

Oxygen levels rise steadily as algae and bacteria fill the seas.

Algae and other life forms evolve. They could make their own food using the sun's energy, and oxygen was their waste.

Animals evolved using oxygen to respire.

Learn more on evolution here https://brainly.com/question/12271572

#SPJ1

Answer:

• There are 1.8 mol of nitrogen in 0.30 mol of caffeine.

• There are 21.6 mol of hydrogen in 2.7 mol of caffeine.

• There are 16.0 mol of carbon in 2.0 mol of caffeine.

• There are 5.0 mol of oxygen in 2.5 mol of caffeine.

Explanation:

Answer: Prayagraj

Uttar Pradesh, India

i hope this helps :) Can i get brainiest ?

Answer:

Prayagraj

Explanation:

Uttar Pradesh, India

However, this is predicated on the idea that the atmospheric carbon 14 content has remained constant.The answer, which is possibly 3 x 5568, is 16,704 years.

Three half life have elapsed when a reduction is made to one eighth of existing levels (1/2 3 = 1/8).

To accommodate for fluctuations in carbon 14 concentration levels, a modification should be made.

The correction can be calculated using the graph below.

The answer, which is possibly 3 x 5568, is 16,704 years.

However, the half life of carbon 14 is actually 5730 +/- 40 years, not 5,568.

3 * 5730 = 17,190 years.

However, this is predicated on the idea that the atmospheric carbon 14 content has remained constant.

Not at all.

A adjustment should be used to account for variations in carbon 14 concentration levels.The graph below can be used to determine the adjustment.

To learn more about radioactive decay refer

https://brainly.com/question/14415679

#SPJ1

Answer:

3.64g

Explanation:

Given parameters:

Mass of NH₃  = 18.1g

Mass of Cu₂O  = 90.4g

Unknown:

Limiting reactant  = ?

Mass of N₂ formed  = ?

Solution:

The reaction equation is given as:

       Cu₂O + 2NH₃ → 6Cu + N₂ + 3H₂O

The limiting reactant is the one in short supply in the reaction. Let us find the number of moles of the given species;

  Number of moles = \(\frac{mass}{molar mass}\)  

Molar mass of Cu₂O = 2(63.6) + 16  = 143.2g/mol

Molar mass of NH₃  = 14 + 3(1) = 17g/mol

Number of moles of Cu₂O = \(\frac{18.1}{143.2}\)   = 0.13moles

Number of moles of NH₃   = \(\frac{90.4}{17}\)   = 5.32moles

  From this reaction;

       1 mole of  Cu₂O combines with 2 mole of NH₃

So   0.13moles of  Cu₂O will combine with 0.13 x 2 mole of NH₃

                                              = 0.26moles of NH₃

Therefore, Cu₂O is the limiting reactant. Ammonia is in excess;

Mass of N₂;

   Mass = number of moles x molar mass

    1 mole of Cu₂O  will produce 1 mole of N₂

    0.13 mole of Cu₂O  will produce 0.13 mole of N₂

    Mass  = 0.13 x (2 x 14) = 3.64g

The amount of energy that is required to change 20.0 g of an unknown substance from -15.0 °C to 7.0 °C is q = +49.65 kJ.

Energy is the ability to do tasks. It can exist in various forms, including potential, kinetic, thermal, electrical, chemical, and nuclear.

At -15°c, it will be solid, to increase the amount of heat to raise

temp from -15°C to 40°C.

(20.0) (3.3J/g°c) x 15°C) = 330 J.

At -10°C, it is in which phase transformation takes place from sold to wound.

ΔHfue = 0.945 J/gx 20g = 18.93.

After that, it will be in want and it will be in liquid form 40°C.

To 7°C, then.

922 m Cgas 47

=(20g) (1455/g°c) (17)

493005.

Total Energy = q1 + ΔHfus  + q2

47 = 7.0°C - 10°C) = 14°C -

2 330J18.95 + 49300J

q = 49648.9 3. 9

q = +49.65 KJ

Therefore, the amount of energy is q = +49.65 KJ.

To learn more about energy, refer to the link:

https://brainly.com/question/3805749

#SPJ1

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.

Know more about  hydroxide ions   here:

https://brainly.com/question/28464162

#SPJ8

Answer:

so so

Explanation:

this your question?? <_>

Answer:

4.76

Explanation:

In this case, we have to start with the buffer system:

\(CH_3COOH~->~CH_3COO^-~+~H^+\)

We have an acid (\(CH_3COOH\)) and a base (\(CH_3COO^-\)). Therefore we can write the henderson-hasselbach reaction:

\(pH~=~pKa+Log\frac{[CH_3COO^-]}{[CH_3COOH]}\)

If we want to calculate the pH, we have to calculate the pKa:

\(pH=-Log~Ka=4.76\)

According to the problem, we have the same concentration for the acid and the base 0.1M. Therefore:

\([CH_3COO^-]=[CH_3COOH]\)

If we divide:

\(\frac{[CH_3COO^-]}{[CH_3COOH]}~=~1\)

If we do the Log of 1:

\(Log~1=~zero\)

So:

\(pH~=~pKa\)

With this in mind, the pH is 4.76.

I hope it helps!

The  statements about an E1 mechanism is not true is that  " the loss of a proton by the carbocation is a slow step."

The E1 mechanism is also called as the unimolecular elimination reaction. in the E1 mechanism there are two parts involves that is ionization and deprotonation. In the ionization process the formation of the carbocation takes place as the intermediate. and in the deprotonation steps the protons is lost by the carbocation.

Thus, in the E1 mechanism the loss of the proton by the carbocation is not the slow step. this process happens in the presence of the base.

To learn more about E1 mechanism here

https://brainly.com/question/14787332

#SPJ4

1. The IUPAC name of N is nitrogen.

2. Nitrogen dioxide

3.The IUPAC name of O is oxygen

4.The IUPAC name of OH is hydroxyl.

The IUPAC name of ·0 is a radical. It is commonly found in organic chemistry and plays an important role in many reactions.

IUPAC names for the given compounds are:1.1. N: Nitrogen

The IUPAC name of N is nitrogen.

It is a non-metal and belongs to group 15 in the periodic table. It has an electronic configuration of 1s2 2s2 2p3.1.2. NO2: Nitrogen dioxide

Explanation: NO2 is a chemical compound that is formed by the combination of nitrogen and oxygen. It is a reddish-brown gas that has a pungent odor.

The IUPAC name of NO2 is nitrogen dioxide.1.3. O: Oxygen

Explanation: The IUPAC name of O is oxygen.

It is a non-metal and belongs to group 16 in the periodic table. It has an electronic configuration of 1s2 2s2 2p4.

X: UnknownExplanation: No IUPAC name can be given to an unknown compound as the structure and composition are not known.

Y: Hydroxyl Explanation: The IUPAC name of OH is hydroxyl.

It is a functional group that is composed of an oxygen atom and a hydrogen atom (-OH). It is commonly found in alcohols and phenols. ·0: RadicalExplanation: A radical is a molecule or an ion that contains an unpaired electron.

for more question on electronic configuration

https://brainly.com/question/26084288

#SPJ8

Note: The complete question is given below

Provide the IUPAC names for the following compounds:

\(CH_3CH_2CH(CH_3)CH_2CH_2CH_2CH_3\)

C6H5CH(CH3)2

H2NCH2CH2CH2CH2CH2NH2

CH3CH2CH2CH2CH2OH

CH3CH2CH2CHOHCH3

Answer:

\(m_{CaF_2}0.375gCaF_2\)

Explanation:

Hello,

In this case, for the studied reaction:

\(2KF+Ca(HCO_3)_2\rightarrow CaF_2+2KHCO_3\)

Thus, the first step is to compute the reacting moles of potassium fluoride by using its volume and molarity:

\(n_{KF}=0.0157L*0.612\frac{mol}{L} =9.61x10^{-3}molKF\)

Then, we apply the 2:1 molar ratio between potassium fluoride and calcium fluoride to compute the produced moles of calcium fluoride:

\(n_{CaF_2}=9.61x10^{-3}molKF*\frac{1molCaF_2}{2molKF} =4.80x10^{-3}molCaF_2\)

Finally, by using the molar mass of calcium fluoride (78.07 g/mol) we can compute its produced grams:

\(m_{CaF_2}=4.80x10^{-3}molCaF_2*\frac{78.07gCaF_2}{1molCaF_2} \\\\m_{CaF_2}0.375gCaF_2\)

Best regards.

Answer:

fossils come from way back they can be left from dinosaurs and other species  

Explanation:

Answer:

Using fossils, you can learn about extinct animals and plants, that's one. Two, you can learn about evolutionary traits and the fact that evolution exists.

Explanation:

Answer:

3 atoms of Ba

2 x 1 = 2 atoms of Cl

2 x 3 = 6 atoms of O

So, the total number of atoms for each element in 3Ba(ClO3)2 are:

Barium (Ba): 3 atoms

Chlorine (Cl): 2 atoms

Oxygen (O): 6 atoms

Explanation:

The affect of radiation on healthy cells can be reduced when treating cancer by focusing the radiation on the cancerous cells.

These side effects are also known as late side effects, which causes the human healthy cells after some time. The Doctors try to protect the healthy human cells by lowering the power of the radiations as possible. The radiation dose is balanced between being high enough to kill cancer cells, yet low enough to limit damage to healthy cells. If we use the advancement of technology of dose conformity such as IMRT, SBRT, and IGRT, then we can get rid of such dangerous radiations.

So we can conclude that the affect of radiation on healthy cells can be reduced when treating cancer by focusing the radiation on the cancerous cells.

Learn more about cancer here: https://brainly.com/question/26059802

#SPJ1

Answer: A model would be useful because the model makes the concepts easier to understand.

Explanation:

Models are helpful tools in science education that can be used to enhance explanations, spark discussion, make predictions, provide visual representations of abstract concepts, and create mental models.

Answer:

See explanation

Explanation:

In molecules with the same number of electron groups but different molecular geometries, the bond angles differ markedly owing to the presence of lone pairs on the central atom. Recall that lone pairs of electrons take up more space around the central atom and causes more repulsion thus squeezing the bond angle and making it less than the value expected on the basis of the Valence Shell Electron Pair Repulsion Theory.

As the number of bonding groups increases, the bond angle increases since the repulsion due to lone pairs of electrons is being progressively removed by increase in the number of bonding groups.

For 5 electron group molecules, the axial groups are oriented at a bond angle of 90° while the equatorial groups are oriented at a bond angle of 120°. In the presence of lone pairs, the equatorial bonds are removed because the equatorial bonds often have a greater bond length than the axial bonds.

In the tetrahedral geometry, four groups are bonded to the central atom while in a bent molecular geometry, only two groups are bonded to the central atom with two lone pairs present in the molecule.

Answer: Heyo Kenji Here! Here's your answer- In a fat molecule, the fatty acids are attached to each of the three carbons of the glycerol molecule with an ester bond through the oxygen atom. During the ester bond formation, three molecules are released. Since fats consist of three fatty acids and a glycerol, they are also called triacylglycerols or triglycerides.

Explanation: Hope this helps!

Have a nice day!

- Kenji ^^

The option that describes a situation in which reduction occurs is Cl₂ becoming Cl⁻

In chemistry, reduction means a class of chemical reactions in which the number of electrons associated with an atom or group is increased.

A compound that accepts electrons is said to be reduced.

Situations in which reduction occurs include:

Cl₂ ⇒Cl⁻

When reduction occurs, the oxidation number (superindex) appears to decrease that number. In this case 2+ becomes 1-.

Note:

As with other problems, a decreasing oxidation number means that the compound or element is being reduced (gaining electrons), while an increasing oxidation number means it is being oxidized (losing electrons). increase.

learn more about oxidation-reduction refer:

brainly.com/question/4222605

#SPJ4

Answer:

15

Explanation:

Magnesium Acetate Mg(C2H3O2)2

Number of atoms:

Carbon = 4

Hydrogen = 6

Magnesium = 1

Oxygen = 4

Total = 15

Answer:

\(\boxed {\boxed {\sf 2.7 \ g/mL}}\)

Explanation:

Density is the mass per unit volume of a substance. It is calculated by dividing the mass by the volume.

\(\rho = \frac{m}{v}\)

The mass of the mineral is 48.6 grams. The volume is 18 milliliters.

Substitute the values into the formula.

\(\rho= \frac{ 48.6 \ g}{18 \ mL}\)

Divide.

\(\rho = 2.7 \ g/ mL\)

The density of the mineral sample is 2.7 grams per milliliter.

The dependent variable in this case is the length of the cattails while the independent variable is the volume of water received.

An experiment is a carefully controlled study which establishes a cause and effect relationship between variables. There must be a dependent variable and an independent variable.

The dependent variable in this case is the length of the cattails while the dependent variable is the volume of water received. The control group is the group that did not receive any water.

Learn more about experiment: https://brainly.com/question/9199868

Answer:

Science textbooks around the world have become suddenly out of date. Four new chemical elements have been added to the periodic table. A big decision now lies ahead - elements 113, 115, 117 and 118 need to be given their official names and symbols.

New elements can be named after a mythological concept, a mineral, a place or country, a property or a scientist. The names have to be unique and maintain "historical and chemical consistency" . This means a lot of "-iums".

"They're Latinising the name," explains chemist Andrea Sella of University College London. "The most recent tradition has been to name them after places or after people." The places chosen tend to be where the element was discovered or first manufactured. The Swedish village of Ytterby has managed to get four named after it (ytterbium, yttrium, erbium and terbium).

No-one has yet named an element after themselves but many elements are named in tribute to important scientists. Albert Einstein was given einsteinium. This can also be a way of righting the wrongs of the past. "Lise Meitner was really the chemist who spotted nuclear fission but she was never really recognised for it because she was Jewish and a woman," says Sella. "To be able to give an element a name that reminds us of her is I think greatly important."

The naming process isn't quick. The scientists who discovered them will start things off by proposing a name. But it will be down to the International Union of Pure and Applied Chemistry (IUPAC) to approve it. A special division of the US-based group has to accept the proposal. There is then a public review period of five months before the IUPAC council gets the final approval. Once it's ready, the name is announced in the scientific journal Pure and Applied Chemistry .

Scientists sometimes get creative. Mythical names have proved popular. Promethium was named after a character from a Greek legend who stole fire from the gods to give to humans and was punished by being chained to rock so an eagle could feed on his liver. The name was meant to reflect the fact that synthesising new elements often requires sacrifice.

There is hidden meaning in the table - as in the naming of praseodymium and neodymium. They replaced didymium - wrongly thought to be an element but in fact a mixture of the two. "The reason I like them is because they're called the green twin and the new twin," says Sella. "Didymium was named after [the Greek for] twin but in fact it also means testicles."

Naming an element is not just about functionality. "There's a tremendous romance to this," he adds. "Names are always important."