Density is the amount of mass in a certain volume
of an object. To find the density in grams per cubic centimeter
of a substance you can use this relationship:
mass in grams
Density= volume in cubic centimeters
gold bar that is 16 centimeters by 2.5 centimeters by
centimeters has a density of 19.3 grams per cubic centimeter.
What is the mass of the gold bar?

Decene has a chemical formula of and has 75 isomers. In this example, all alkanes up to ten carbon atoms in length are meticulously listed starting with methane and proceeding in this manner.

A nuclide isomeric with one or more others is one of two or more molecules, radicals, or ions that have the same number of atoms of the same elements but differ in their structural arrangement and characteristics.

The isomers known as structural isomers have the same chemical formulae but have their atoms totally rearranged in a different order. These are molecules with the same type of molecular formula but various connectivities based on the order in which they are assembled.

Carbon chains have the potential to branch, these isomers are created. For instance, the chemical butane, C4H10, has two isomers. One of them has a "straight chain" of carbon atoms, whereas the other has a branched chain.

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Flexible container at  initial volume of 5.12 l contains 8.51 mol of gas. The more gas is then added to the container until it reaches a final volume of the 13.3 l. The number of moles of gas added to the container is 22.1 mol.

The ideal gas equation is as follows :

P V = n R T

The  pressure and temperature of the gas remain constant, WE GET

V₂ / V₁ = n₂ / n₁

n₂ = V₂ n₁ / V₁

Where,

V₁ = 5.12 L

V₂ = 13.3 L

n₁ = 8.51 mol

n₂  = ( 13.3 × 8.51 ) / 5.12

    = 22.1 mol

The number of the moles added is 22.1 mol.

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If the theoretical yield of a reaction is 24.8 g and the actual yield is 18.5 g,  The percent yield that we get is 74.6%

Percent yield is the percent ratio of actual yield to the theoretical yield. It is calculated to be the experimental yield divided by the theoretical yield multiplied by 100%. If the actual and theoretical yield ​is the same, the percent yield is 100%

Here it is given the actual yield is 18.5g and the theoretical yield is 24.8g

Formula to calculate percent yield:

Percent yield = actual yield/ theoretical yield × 100

                      = 18.5 / 24.8 × 100

                      = 74.6 %

Therefore the percent yield is 74.6%

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Answer:

This is an oxidation-reduction (redox) reaction

Explanation:

P4

O2

Names: Dioxygen source: wikidata, accessed: 2019-09-07, Oxygen source: ICSC, accessed: 2019-09-04source: wikidata, accessed: 2019-09-07, Oxygen (liquefied) source: ICSC, accessed: 2019-09-04

Appearance: Odourless compressed gas source: ICSC, accessed: 2019-09-04; Liquefied gas. colourless-to-blue extremely cold liquid source: ICSC, accessed: 2019-09-04

Products:

P2O3

Names: Phosphorus trioxide source: wikipedia, accessed: 2019-09-27, Phosphorus(III) oxide source: wikipedia, accessed: 2019-09-27, Phosphorus sesquioxide source: wikipedia, accessed: 2019-09-27

Appearance: Colourless monoclinic crystals or liquid source: wikipedia, accessed: 2019-09-27

Answer:

Sodium and chlorine combine to make salt

Explanation:

Answer:

vinegar and soda

Explanation:

:)

Answer:

Atoms are single neutral particles. Molecules are neutral particles made of two or more atoms bonded together. An ion is a positively or negatively charged particle.

Answer:

atoms constitute molecules; molecules are formed by the union of 2 or more atoms

Explanation:

Answer:

B. It is highly flammable.

Explanation:

Chemical properties deal with how the substance will behave when brought into contact with other substances, and usually have to do with it undergoing some kind of reaction. Flammability is a chemical property.

Density, melting point, and color are all considered physical properties.

Answer:

d

Explanation:

ignition is a chemical. reaction

Answer:

An atom that gains a negative electron, it becomes a negative ion. ... A lithium atom has 3 protons and 3 electrons. It can lose one of its electrons, making it an ion. It now has more positive protons than electrons so it has an overall positive charge.

Answer:

This means a Lithium atom formed into a Lithium ion by losing one of its electrons. It has three electrons and three protons to begin with. So when it loses or gains one the amount isnt equal, that is why it becomes an ion. If it gained electrons it would have a negative charge on the nulcleus, though if it lost electrons it would have a positivec charge. Hope this helped!!

Answer:

Due to their densities.

Explanation:

Answer:

Liquid water is held together by hydrogen bonds. (Liquid water has fewer hydrogen bonds than ice.) Oils and fats not have any polar part and so for them to dissolve in water they would have to break some of water's hydrogen bonds. Water will not do this so the oil is forced to stay separate from the water.

Explanation:

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The cleavage yields a carbonyl cation or "acylium" ion, which has a high abundance because it is resonance stabilized.

The ion that is formed as a result of alpha-fragmentation in a ketone or aldehyde mass spectrum is called the acylium ion. This ion is stabilized by resonance, which is why it is typically observed as the base peak in the mass spectrum. The acylium ion is a cationic species that contains a positive charge on the carbonyl carbon and a lone pair of electrons on the oxygen atom. This charge distribution allows for resonance stabilization, as the positive charge can be delocalized across the carbonyl carbon and the adjacent carbon atom. The acylium ion is also a reactive intermediate that can undergo further fragmentation or reactions with other molecules. Overall, the observation of the acylium ion as the base peak in a ketone or aldehyde mass spectrum provides valuable information about the structure and stability of these compounds.

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Here is the structure for (E)-3-phenyl-2-propen-1-ol:

         H

         |

  H ─ C ─ C ─ C ─ OH

       |   ||

       |   |Ph

       |   |

       H   CH3

In the structure, "Ph" represents a phenyl group (C6H5) attached to the second carbon atom. The double bond between the second and third carbon atoms indicates the E configuration, meaning the higher priority groups (in this case, the phenyl group and the hydrogen atom) are on opposite sides of the double bond.

The -OH group represents an alcohol functional group attached to the first carbon atom.

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Answer:

C

Explanation:

Hydrogen has one electron in its outermost shell, while fluorine has seven electron in its outermost shell, hence both hydrogen and fluorine needs a single electron to complete its outermost shell. That's why there is a single bond between hydrogen and fluorine.

Both hydrogen and fluorine share one electron with each other for the completion of their outermost shell. So the correct option is C.

In chemistry, the interatomic linkage that can be formed between atoms of the same or different elements and is due to the sharing of an electron pair between two atoms is called a covalent bond.

The kind of bonding is the result of an electrostatic force of attraction of their nuclei for the same electrons so that they can complete their octet. When the bonded atoms have lower total energy than that of widely separated atoms, a covalent bond is formed m

The inorganic substances hydrogen, nitrogen, chlorine, water, and ammonia (H2, N2, Cl2, H2O, NH3) and also all the organic compounds are the molecules that have covalent bonding. In the case of structural representations of molecules, this type of bonding is indicated by solid lines that connect pairs of atoms.

Therefore the correct option is C.

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Answer:

\(m_{N_2}=93.3gN_2\)

Explanation:

Hello there!

In this case, for this stoichiometry-based problem, it is firstly necessary to realize that the decomposition of ammonium dichromate is given by:

\((NH_4)_2Cr_2O_7(s)\rightarrow N_2(g)+4H_2O(l)+Cr_2O_3(s)\)

Thus, since the mole ratio between ammonium dichromate and the gaseous nitrogen (molar mass = 28.02 g/mol) is 1:1, we can compute the produced mass of the latter via stoichiometry as shown below:

\(m_{N_2}=3.33mol(NH_4)_2Cr_2O_7*\frac{1molN_2}{1mol(NH_4)_2Cr_2O_7}*\frac{28.01gN_2}{1molN_2}\\\\ m_{N_2}=93.3gN_2\)

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Density function: f(x) = 1/10, for 110 ≤ x ≤ 120, and f(x) = 0 otherwise.

Mean: μ = 115.

Variance: σ^2 = 25/3.

Probability: P(112 < X < 115) = 0.3.

Given that the melting point X is uniformly distributed over the interval [110, 120], we can find the density function, mean, variance, and probability as follows:

1. Density function:

Since X is uniformly distributed, the density function f(x) is constant within the interval [110, 120] and zero outside that interval. To find the density function, we need to determine the height of the constant density.

The total length of the interval is 120 - 110 = 10.

Since the density function is constant, the area under the density function curve must be equal to 1.

Therefore, the height of the constant density is 1 divided by the length of the interval: f(x) = 1/10, for 110 ≤ x ≤ 120, and f(x) = 0 otherwise.

2. Mean:

The mean (μ) of a uniform distribution is the average of the endpoints of the interval. In this case, the mean is (110 + 120) / 2 = 115.

3. Variance:

The variance (σ^2) of a uniform distribution is calculated using the formula: σ^2 = (b - a)^2 / 12, where a and b are the endpoints of the interval. In this case, the variance is (120 - 110)^2 / 12 = 10^2 / 12 = 100/12 = 25/3.

4. Probability:

To find P(112 < X < 115), we need to calculate the area under the density function curve between the points 112 and 115.

Since the density function is constant within the interval [110, 120], the probability is equal to the ratio of the length of the interval [112, 115] to the length of the entire interval [110, 120].

The length of the interval [112, 115] is 115 - 112 = 3.

The length of the entire interval [110, 120] is 120 - 110 = 10.

Therefore, P(112 < X < 115) = (3 / 10) = 0.3.

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A. Assimilation is the step of the carbon cycle that occurs when a plant absorbs carbon dioxide for photosynthesis.

In the field of science, the process through which carbon in its various forms circulates between the atmosphere and the Earth layers is referred to as the carbon cycle.

Assimilation is the step of the carbon cycle in which carbon dioxide or other carbon compounds from the atmosphere become absorbed into the cells of living organisms. Hence, the step where plants absorb carbon dioxide for photosynthesis is assimilation.

Through the process of photosynthesis, carbon dioxide and water are converted into glucose and oxygen.

Although a part of your question is missing, you might be referring to this question:

What step of the carbon cycle is occurring when a plant absorbs carbon dioxide for photosynthesis?

A. Assimilation.

B. Recharge.

C. Release.

D. Reservoir

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Answer:

hope it helped you

Explanation:

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In 1 angle AOD is an obtuse angle and is 110°  and angle GOD is an acute angle and it is 70°.

90 degrees is the standard for a right angle. Any angle that is less than 90 degrees is called acute, and any angle that is larger than the 90 degrees is called obtuse.

Follow the instructions below to use a protractor to measure an angle. Align the angle's vertex with the protractor's dot in the center. Set the protractor such that one angle's side is parallel to 0 degrees. Find the point where the angle's opposite side crosses the number scale by reading the protractor.

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Inorganic chemistry is a type of chemistry studies non-carbon based materials

Organic chemistry is defined as the study of carbon-containing compounds, inorganic chemistry is the study of the remaining means not carbon-containing subset of compounds and inorganic chemistry focuses on structures that do not contain carbon and most commonly these structures include oxygen, silicon, aluminum, iron, calcium, sodium and magnesium and inorganic chemistry also studies synthesis, reactions, structures and properties of compounds

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Answer:

in organic chemistry is the type of non carbon based materials.

Explanation: it is a study of behavior and properties of in organic compounds which includes metals, minerals , compounds.

1.) H2SO4 is the limiting reagent ; 2.) Excess H2SO4 = 41.66 g ; 3.) Theoretical yield of CaSO4 is 73.40 g. ;  4.) Percent yield of HF is 74.4%.

Reactant that is totally consumed when chemical reaction is completed is called limiting reagent.

1.) Moles of CaF2 = 42.0 g / 78.07 g/mol = 0.5386 mol

Moles of H2SO4 = 94.5 g / 98.08 g/mol = 0.9637 mol

Using the stoichiometric ratios, 0.5386 moles of CaF2 would produce 2 x 0.5386 = 1.0772 moles of HF, while 0.9637 moles of H2SO4 would produce only 0.9637 moles of HF. Therefore, H2SO4 is the limiting reagent.

2.) 0.9637 moles H2SO4 x (1 mole CaF2 / 1 mole H2SO4) = 0.9637 moles CaF2

This means that only 0.5386 moles of CaF2 was actually consumed in the reaction. Therefore, 0.9637 - 0.5386 = 0.4251 moles of H2SO4 was left over.

Excess H2SO4 = 0.4251 mol x 98.08 g/mol = 41.66 g

3.) Moles of CaSO4 produced = Moles of CaF2 consumed = 0.5386 mol

Mass of CaSO4 produced = 0.5386 mol x 136.14 g/mol = 73.40 g

Therefore, the theoretical yield of CaSO4 is 73.40 g.

4.) As percent yield = (Actual yield /Theoretical yield) x100

Percent yield = (14.2 g / (0.9637 mol x 20.01 g/mol)) x 100 = 74.4%

Therefore, the percent yield of HF is 74.4%.

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Answer:

Explanation:

From the net ionic equation

Ba2+(aq) + SO42-(aq) ==> BaSO4(s) we see that 1 mole Ba2+ reacts with 1 mole SO42- to -> 1 mol BaSO4

Find moles of Ba2+ used: 0.250 moles/L x 0.0323 L = 0.008075 moles Ba2+

Find moles SO42- present: 0.008075 moles Ba2+ x 1 mol SO42-/1 mol Ba2+ = 0.008075 mol SO42-

Find mass of Na2SO4 present: 0.008075 mol SO42- x 1 mol Na2SO4/1 mol SO42- x 142.04 Na2SO4/mole = 1.14698 g = 1.15 g Na2SO4 (to 3 significant figures)

Answer: Approx 2kg of salt are required.

Explanation: If 4.5 ⋅ L of a 3.0 ⋅ m o l ⋅ L − 1 solution are required, this is a molar quantity of 4.5 ⋅ L × 3.0 ⋅ m o l ⋅ L − 1 = 13.5 ⋅ m o l . Now, we simply multiply this molar quantity by a molar mass to get the mass: 13.5 ⋅ m o l × 142.04 ⋅ g ⋅ m o l − 1 = ? ? ⋅ g

Answer:

steel, plastics

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Considering the definition of STP conditions and Avogadro's Number, 1.952496 L of methane will occupy 5.25×10²² molecules at STP.

The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.

Avogadro's Number is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

You can apply the following rule of three: if 6.023×10²³ molecules are contained in 1 mole of methane, then 5.25×10²² molecules are contained in how many moles of methane?

amount of moles of methane= (5.25×10²² molecules × 1 mole)÷ 6.023×10²³ molecules

amount of moles of methane= 0.087165 moles

There are 0.087165 moles of methane in 5.25×10²² molecules.

You can apply the following rule of three: if by definition of STP conditions 1 mole of methane occupies a volume of 22.4 liters, 0.087165 moles occupies how much volume?

volume= (0.087165 moles× 22.4 L)÷1 mole

volume= 1.952496 L

Finally, 1.952496 L of methane will occupy 5.25×10²² molecules at STP.

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Answer:

D

Explanation:

If their reactions are the same, that is a way to begin to figure out if the samples came from the same substance!

Hope this helps!

Answer:

Explanation:

D

Answer:

B. A+ B → AB

Explanation:

general form of a synthesis reaction

Answer:

1 atm

Explanation:

Given:

Atmospheric pressure = 760 torr

Find:

Atmospheric pressure in atm

Computation:

We know that ;

1 torr = 0.00131579atm

So,

760 torr = 760 x 0.00131579atm

760 torr = 1 atm (Approx)

Atmospheric pressure in atm = 1 atm

The diagram below has an atmospheric pressure of 760 torr. The

atmospheric pressure will be 1 atm.

This is calculated by converting Torr to atm which are both units of pressure.

The standard conversion formula is

1 torr = 0.00131579atm.

This means that

760 torr = 760 x 0.00131579atm

760 torr = 1 atm

Atmospheric pressure in atm is therefore 1 atm.

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The single change that would increase the radius of the circular path of an ion moving in a uniform magnetic field is to increase the ion's velocity. This is because the radius of the circular path is directly proportional to the ion's velocity.

Lorentz force, the force exerted on a charged particle q moving with velocity v through an electric field E and magnetic field B. The entire electromagnetic force F on the charged particle is called the Lorentz force (after the Dutch physicist Hendrik A. Lorentz) and is given by

\(F = qE + qv × B.\)

An ion moving through a magnetic field experiences a force, called the Lorentz force, which bends the trajectory of the ion. Under suitable conditions the trajectory of the ion will bend into a circle therefore, increasing the ion's velocity would lead to a larger circular path, while keeping the magnetic field uniform.

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The false statement about buffers is: d) a buffer always consists of a weak acid and a soluble ionic salt of the weak acid.

Buffers are solutions that can resist changes in pH when small amounts of acids or bases are added. They typically consist of a weak acid and its conjugate base (or a weak base and its conjugate acid). The weak acid and its conjugate base are present in equilibrium, allowing the buffer to accept or donate protons to maintain a relatively constant pH. Option d is false because a buffer can consist of a weak acid and its conjugate base, or a weak base and its conjugate acid. It is not necessary for a buffer to always include a soluble ionic salt.

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