Percent yield is the ratio between actual and theoretical yield multiplied by 100%. The higher the actual yield the higher is the percent yield. In the percent yield there is always a limiting reagent that creates the difference between what is obtained and what is calculated. Percent yield can never exceed 100% if that happens it means that there was some error in the theoretical yield calculation.
In which of the following is the name and formula paired correctly?
stannic fluoride, SnF4
barium nitride, Ban
cobaltous chloride, CoCl3
sodium oxide, Nao
Answer:
Stannic fluoride, SnF4
Explanation:
The chemical formula of Barium nitride is Ba(NO3)2.
The chemical formula of Cobaltous chloride is COCl2.
The chemical formula of Sodium Oxide is Na2O.
So the correct one is stannic fluoride, SnF4.
Answer:
The name and formula is paired correctly for Stannic Fluoride - [tex]SnF_4[/tex]
Explanation:
In this case, we have four names of chemical substances and four formulas. So, we should check each one of those in order to be sure if the name and the formula are paired correctly.
First: Sodium Oxide. The formula for this oxide is [tex]Na_2O[/tex]. The formula paired is NaO. In this case, formula and name are not correctly paired. NaO is not a chemical substance, due to the fact that Oxygen always should have -2 of valence as it was shown in the right formula [tex]Na_2O[/tex]
Second: Cobaltous Chloride. The formula for this Chloride is [tex]CoCl_2[/tex]. The formula paired is [tex]CoCl_3[/tex].
[tex]CoCl_3[/tex] name is Cobaltic Chloride. Taking into account both formula we can mention that formula and name are not correctly paired.
Third: Barium Nitride. The formula for this Nitride is [tex]Ba_3N_2[/tex]. The formula paired is BaN. Formula and name are not correctly paired. BaN is not a chemical substance, Valence of elements are not coherent with the groups in the periodic table.
Finally: Stannic Fluoride. The formula for this Fluoride is [tex]SnF_4[/tex]. The formula paired is [tex]SnF_4[/tex]. So, this is the formula and name correctly paired.
7. A reaction that has oxygen as a reactant and usually has carbon dioxide and water as products
is a ______ reaction?
Answer:
Explanation:
Such a reaction used to be called a hydrocarbon burning reaction. For example, the burning of gasoline (octane) looks like this.
C8H18 + 13.5 O2 ===> 8CO2 + 9H2O
In plants, carbon dioxide and water combine to form glucose and oxygen. This process is known as photosynthesis.
Which of the following is the balanced equation for this process?
A.
B.
C.
D.
Answer:
Explanation:
Since the equation is not given, let us write and balance it:
Reactants: Carbon dioxide (CO₂)
Water(H₂O)
Products: Glucose(C₆H₁₂O₆)
Oxygen(O₂)
The reaction equation is shown below:
CO₂ + H₂O → C₆H₁₂O₆ + O₂
But the equation is not balanced:
to balance the equation
aCO₂ + bH₂O → cC₆H₁₂O₆ + dO₂
for C:
a = 6c, if c = 1 then a = 6
for O:
2a + b = 6c + 2d
for H:
2b = 12c, since c = 1, b = 6
In 2a + b = 6c + 2d, solving for d:
2(6) + 6 = 6(1) + 2d
18 = 6 + 2d
d = 6
Therefore, the balanced equation is:
6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
Photosynthesis is the process where six molecules of carbon dioxide and six molecules of water combine, using light energy, to produce one molecule of glucose and six molecules of oxygen. This procedure is unique to plant cells and fosters life as we know it on Earth.
Explanation:The process you're referring to is indeed called photosynthesis and this process happens in cells of plants, which absorb sunlight to carry out this operation. The balanced equation for photosynthesis is written as:
6CO₂ + 6H₂O -------light------> C₆H₁₂O₆ + 6O₂
In other words, this equation reads: Six molecules of carbon dioxide plus six molecules of water, using light energy, produce one molecule of glucose and six molecules of oxygen. This procedure, which can only be completed by plant cells, enhances life on Earth as we know it.
Learn more about Photosynthesis here:https://brainly.com/question/29764662
#SPJ6
what are some applications of fission reactions?
as a zero-waste energy source
Answer:
Both fission and fusion are nuclear reactions that produce energy, but the applications are not the same. Fission is the splitting of a heavy, unstable nucleus into two lighter nuclei, and fusion is the process where two light nuclei combine together releasing vast amounts of energy.
Explanation:
Final answer:
Nuclear fission is used primarily in nuclear reactors to generate electricity and in nuclear weapons. While it is more environmentally friendly than fossil fuels, it still produces radioactive waste, challenging the perception of it as a zero-waste energy source.
Explanation:
Applications of Fission Reactions
Nuclear fission reactions involve the splitting of a heavy atomic nucleus into two or more lighter nuclei, along with the release of energy and neutrons. This process is not only fundamental in nuclear power plants, where the energy released is harnessed to generate electricity, but also underlies the destructive power of nuclear weapons.
Nuclear reactors use controlled fission reactions to heat water, producing steam that drives turbines to generate electricity. This method of producing power is seen as a more environmentally friendly alternative to fossil fuels, as it does not produce greenhouse gases. Moreover, many countries see the development and application of nuclear technology as critical for ensuring energy security.
However, it is important to note that while nuclear power is seen as a potential solution to global warming, it is not a zero-waste energy source. The spent nuclear fuel and other radioactive waste generated by nuclear reactors pose significant disposal challenges.
what type of intermolecular force occurs between polar molecules?
A) dipole-dipole force
B) hydrogen bonding
C) induced dipole force
D) polar covalent bonding
Answer:
A) dipole-dipole force
Explanation:
A dipole-dipole force is the type of intermolecular force that occurs between polar molecules.
The intermolecular force occurs between polar molecules is dipole-dipole bonding. The correct option is A)
What are intermolecular force?Intermolecular forces are those forces that occur when two atom, molecules or ions come close together. There are different types of intermolecular force present between different molecules.
Thus, the correct option is A) dipole-dipole force
Learn more about intermolecular force
https://brainly.com/question/9007693
#SPJ2
Which statements accurately describe the rock cycle? Check all that apply
Answer:
1, 3, 4
Explanation:
Answer:
I just took the lesson
Explanation:
which type of fossils is formed by sediments and found in sedimentary rock
Answer:
Among the three major types of rock, fossils are most commonly found in sedimentary rock. Unlike most igneous and metamorphic rocks, sedimentary rocks form at temperatures and pressures that do not destroy fossil remnants. Often these fossils may only be visible under magnification.
Explanation:
What would cause the shape of a molecule to be tetrahedral?
A. Three atoms bound to a central atom with one lone pair
B. Four atoms bound to a central atom with two lone pairs
C. Four atoms bound to a central atom with no lone pairs
D. Two atoms bound to a central atom with two lone pairs
Answer:
A molecule is tetrahedral if the central atom has four bonds and no lone pairs. Explanation: ... The electron pairs in the bonds repel the electrons in the other bonds, so they all try to get as far from each other as possible.
According to the molecular geometry,four atoms bound to a central atom with no lone pairs would cause the shape of a molecule to be tetrahedral.
What is molecular geometry?
Molecular geometry can be defined as a three -dimensional arrangement of atoms which constitute the molecule.It includes parameters like bond length,bond angle and torsional angles.
It influences many properties of molecules like reactivity,polarity color,magnetism .The molecular geometry can be determined by various spectroscopic methods and diffraction methods , some of which are infrared,microwave and Raman spectroscopy.
They provide information about geometry by taking into considerations the vibrational and rotational absorbance of a substance.Neutron and electron diffraction techniques provide information about the distance between nuclei and electron density.
Learn more about molecular geometry,here:
https://brainly.com/question/7558603
#SPJ5
In both physical and chemical changes,
a. energy can be gained or lost.
b. matter is created
c. matter is destroyed
d. Both a and b
rite your answers on the lines below.
Answer:
option a. energy can be gained or lost.Explanation:
Energy can be gained or lost in both physical and chemical changes.
Most physical changes involve energy gain or loss. For example:
Melting: for a substance to change from solid to liquid, the substance has to gain energy to increase the kinetic energy of the particles and they can overcome the forces of attraction and separate.Similar reasoning can be made about freezing, evaporation, condensation, and many other physical changes.
As per chemical changes, in order to the reactant substances break their bonds energy must be gained, and as new bonds are formed to constitute the product substaces energy is loss. The net change of energy will tell if the reaction is endothermic (net gain of energy) or exothermic (net release or loss of energy).
In order to meet the energy conservation law, the energy that is gained or lost by a substance is lost or gained by other substance.
As per the options b. and c. the law of conservation of mass states that energy can be never be created or destroyed, so those options are incorrect.
What type of bond forms between two oxygen atoms?
a. nonpolar covalent
b. ionic
c. metallic
d. polar covalent
Answer:
A double covalent bond.
Explanation:
A double covalent bond forms between two oxygen atoms.
A double covalent bond is when two pairs of electrons are shared between the atom. Usually, there is only one pair, rather than two pairs.
The electrostatic attractive interaction between the same or different elements is called bonds. A nonpolar covalent is formed between two oxygen atoms. Thus, option a is correct.
What is a covalent bond?A chemical bond that involves the mutual sharing of electrons between the outer valence shell of the elemental atom is called a covalent bond. The covalent bonds are of two types namely polar and non-polar.
The polar covalent bond is the unequal sharing of the electrons in the outer shell due to differences in electronegativities. The non-polar covalent bond is formed between the same or different elements in a compound.
In a non-polar covalent bond like two oxygen atoms, the valence electrons are shared equally and have negligible electronegativity differences.
Therefore, option a. two oxygen atoms form a nonpolar covalent.
Learn more about nonpolar covalent here:
https://brainly.com/question/14533600
#SPJ2
What substance has a melting point of 0 and a boiling point of 100
Answer:
Water
Explanation:
Water molecules are known to have a melting point of 0°C and a boiling point of 100°C.
The melting and boiling points are as a result of the intermolecular force of attraction between the molecules of water. The predominant bond type that dictates the property of the melting and boiling point is the hydrogen bonding. This bond is a strong force of attraction and it impacts on the physical properties of water.
Answer:
Water
Explanation:
The substance that has a melting point at 0 and a boiling point at 100 is water. Water is the only substance that fits into this category. According to van.physics.illinois.edu, it states the following "For pure water, the boiling point is 100 degrees Celsius (212 Fahrenheit) at one atmosphere of pressure, and the melting point is 0 degrees Celsius (32 degrees Fahrenheit) at one atmosphere of pressure."
Answer: Water
A sample of a gas in a balloon has a volume of 2.22 L and temperature of 23.9 °C. Calculate the volume when the temperature is raised to 46.1°C at constant pressure.
Answer:
Volume = 4.28L
Explanation:
Charles's gas law relates the volume and temperature of a gas at constant pressure. This law says that at constant pressures if we raise the temperature of a gas it will expand and if we reduce the temperature the volume will decrease. The formula is as follows:
[tex] {\displaystyle {\frac {V_{1}}{T_{1}}}={\frac {V_{2}}{T_{2}}}} [/tex]
So, the initial conditions are 2.22L and 23.9 °C ant the final conditions are 46.1 °C we replace them in the equation. And then we solve it.
[tex] {\displaystyle {\frac {2.22}{23.9}}={\frac {V_{2}}{46.1}} [/tex]
[tex] {\displaystyle {\frac {2.22}{23.9}} {46.1}={V_{2} [/tex]
[tex] {\displaystyle {4.28}={V_{2} [/tex]
Final answer:
Using Charles's Law, the new volume of a gas when the temperature is increased from 23.9°C to 46.1°C at constant pressure is calculated to be approximately 2.37 liters.
Explanation:
Calculating Change in Gas Volume Due to Temperature Increase
To calculate the new volume of a gas when the temperature is raised, we can use Charles's Law. This law states that at constant pressure, the volume of a gas is directly proportional to its absolute temperature. We can set up the relationship as follows:
V1/T1 = V2/T2
Where:
V1 = initial volume of the gas
T1 = initial temperature in Kelvins
V2 = final volume of the gas
T2 = final temperature in Kelvins
We can convert the temperatures from Celsius to Kelvin by adding 273.15 to each temperature.
T1 = 23.9 °C + 273.15 = 297.05 K
T2 = 46.1 °C + 273.15 = 319.25 K
Substitute the values into the equation:
2.22 L / 297.05 K = V2 / 319.25 K
Solving for V2, we get:
V2 = (2.22 L * 319.25 K) / 297.05 K
V2 ≈ 2.37 L
The new volume of the gas when the temperature is raised to 46.1°C at constant pressure is approximately 2.37 liters.
What is the final pressure (expressed in atm) of a 3.05 l system initially at 724 mm hg and 298 k, that is compressed to a final volume of 2.60 l at 273
Answer:
P2 = 778.05 mm Hg = 1.02 atm
Explanation:
We are to find the final pressure (expressed in atm) of a 3.05 liter system initially at 724 mm hg and 298 K which is compressed to a final volume of 2.60 liter at 273 K.
For this, we would use the equation:
[tex]\frac{P_1V_1}{T_1} =\frac{P_2V_2}{T_2}[/tex]
where P1 = 724 mm hg
V1 = 3.05 L
T1 = 298 K
P2 = ?
V2 = 2.6 L
T2 = 173 K
Substituting the given values in the equation to get:
[tex]\frac{(724)(3.05)}{298} =\frac{P_2(2.6)}{173}[/tex]
P2 = 778.05 mm Hg = 1.02 atm
How many moles are there in 4.00 g of ethanol, CH 3CH 2OH?
Answer:
there are 0.087 moles of ethanol in a 4.00 G sample of ethanol
Explanation:
Number of moles present in a substance is equal to the mass divided by molar mass.
Mathematically, No. of moles = [tex]\frac{mass}{\text{molar mass}}[/tex]
As it is given that mass is 4.00 g and molar mass of [tex]CH_{3}CH_{2}OH[/tex] is 46.07 g/mol.
Hence, calculate the number of moles of [tex]CH_{3}CH_{2}OH[/tex] as follows.
No. of moles = [tex]\frac{mass}{\text{molar mass}}[/tex]
= [tex]\frac{4.0 g}{46.07 g/mol}[/tex]
= 0.086 mol
Thus, we can conclude that number of moles of [tex]CH_{3}CH_{2}OH[/tex] present in 4.00 g is 0.086 mol.
The melting point of an ionic compound will increase as which of the following increases
Answer:
Charge of the ions and size of the ions
Explanation:
Answer:
Lattice Energy
Explanation:
Melting point is the temperature at which a solid changes into a liquid.
The process is called as Melting.
Lattice energy is the energy required by an ionic compound in order to overcome the electrostatic force which is existing between the oppositely charged ions.
Ionic compound which has a strong electrostatic force will have high melting point .
Energy required to break the ionic bond or the Lattice array is more.
Lattice energy depends on two main factors
1) charge of the ions and
2) size of the ions
Lattice energy increases with the increase in charge.
For example Lattice energy of MgO is larger than NaCl.
Mg and O have 2+ and 2- charges respectively
Na and Cl have 1+ and 1- charges.
Lattice energy increases with decrease in size of the ions.
For example NaCl Lattice energy is larger than KBr.
[tex]Na^+[/tex] is smaller than [tex]K^+[/tex] ion
[tex]Cl^-[/tex] is smaller than [tex]Br^-[/tex]
What are two ways selective breeding is helpful in agriculture
Answer:
1: it can produce crops that are resistant to pest
2: it can result in animals that can produce more food
Explanation:
i had the same question
what is 2\5 please let me know what the answer
Answer: 0.4
Explanation: The easiest way to do this is to get a denominator of 10. To do this, multiply each number in 2/5 by 2. You will get the fraction 4/10. With the denominator of 10, the answer would be 0.4 by putting the decimal in front of the number.
Which of the following is not among the three likely sources of heat during the formation of the Earth?
Answer:
Constant volcanic eruption
Explanation:
A scientist realizes there was a significant increase in the number of deaths related to skin cancer last year. Which part of the engineering process is she most likely engaged in?
A) Knowing the background
B) Evaluating the results
C) Making a plan
D) Identifying a need
The part of the engineering process that she is most likely engaged in is identifying a need. Thus, the correct option is D.
What is Skin cancer?Skin cancer may be defined as the circumstance in which there is an uncontrolled growth of abnormal skin cells occur. It causes severe damage to the skin.
After observing the mortality data of last year, scientists identified a need to overcome the threat of a situation that causes a higher number of deaths last year.
Therefore, the correct option for this question is D.
To learn more about Skin cancer, refer to the link:
https://brainly.com/question/25033946
#SPJ2
Final answer:
The scientist noticing an increase in skin cancer deaths is engaged in Identifying a need, the first step of the engineering process where problems are recognized.
Explanation:
If a scientist has noticed a significant increase in the number of deaths related to skin cancer from the previous year, she is most likely engaged in Identifying a need (Option D). This is the first step in the engineering process, where a problem or opportunity is recognized that may need a new or modified technological solution. In the context of this scenario, the identification of the increased skin cancer deaths could lead to a need for improved public health policies, educational programs on sun safety, or the development of better skin protection products.
which pure substance will not conduct electricity ?
1.liquified HCL
2.molten. NaCl
3. molten KOH
4.liquid Na
The answer is answer choice 3
If the average adult woman consumes approximately 2,000 kcal per day, how long would she need to run in order to utilize 25 percent of her caloric intake, given that the energy requirement for running is 42,000 J per minute?
Answer:
Explanation:
She would have about 21,000 back
In a closed system containing three different gases as shown, X2 + Y2 2XY. Choose the TWO things that MUST happen as the volume of the system is decreased at constant temperature. 1)The relative concentrations of each gas must change. 2)The concentration of each gas will increase. 3) The relative concentrations of each gas must remain constant. 4)The concentration of each gas will not change.
Answer:
C,D
Explanation:
Answer:
C D
Explanation:
A student plans to prepare 3.0 liters of 0.50 m naoh solution from a 6.0 m naoh stock solution, how many millilters of stock solution should the student use
Answer : The volume of NaOH stock solution used should be, 250 ml
Solution :
According to the neutralization law,
[tex]M_1V_1=M_2V_2[/tex]
where,
[tex]M_1[/tex] = molarity of NaOH solution = 0.50 M
[tex]V_1[/tex] = volume of NaOH solution = 3.0 L
[tex]M_2[/tex] = molarity of NaOH stock solution = 6.0 M
[tex]V_2[/tex] = volume of NaOH stock solution = ?
Now put all the given values in the above law, we get the volume of NaOH stock solution.
[tex](0.50M)\times (3.0L)=(6.0M)\times V_2[/tex]
[tex]V_2=0.25L=250ml[/tex] (1 L = 1000 ml)
Therefore, the volume of NaOH stock solution used should be, 250 ml
If a molecule has an empirical formula of C2H2O and a molecular mass of 84.0 g/mol, what is the molecular formula?
Answer:
=C₄H₄O₂
Explanation:
Given the empirical formula of a molecule, the he the quotient of the molecular mas and and the empirical mass=constant.
84.0 g/mol/mass of(C₂H₂O)=constant
=84/(12×2+1×2×16)
=84/42
=2
Therefore, the molecular formula is (C₂H₂O)₂=C₄H₄O₂
Answer:
[tex]C_2 H_2 O \times 2=C_4 H_4 O_2[/tex] is the molecular formula
Explanation:
Empirical formula is the simplest form of a Molecular formula.
For example
Molecular formula of glucose is [tex]C_6 H_{12} O_6[/tex]
Its empirical formula is [tex]C_1 H_2 O_1[/tex]
The subscript numbers of the molecular formula is divided by a common number n=6 here.
Another example:
Molecular formula of Octane is [tex]C_8 H_{18}[/tex] and Its empirical formula will be [tex]C_4 H_9[/tex]
Subscripts divided by n=2.
To find n we make use of the formula
[tex]\frac {(molecular mass )}{(empirical formula mass)}=n[/tex]
[tex]= \frac {84.0g}{(C_2H_2O mass)}\\\\=\frac {84.0g}{(24+2+16)g}=\frac {84.0g}{42g}=2[/tex]
So, we see n=2 here
Empirical formula × n = molecular formula
[tex]C_2 H_2 O \times 2=C_4 H_4 O_2[/tex] is the molecular formula
(Answer)
Please note:
Molar mass is the mass of 1 mole of the substance and its unit is g/mol .
n is the number of moles by which the empirical formula is multiplied to get the molecular formula of the compound.
What is agovado constant
_____ numbers are based on the distribution of electrons in a molecule.
Question 4 options:
coefficient
oxidation
electron
chemical
Answer:
oxidation
Explanation:
oxidation number are based on the distribution of electrons in a molecule
Which of these indicates that a liquid has transferred thermal energy to the air?
D
Temperature is equivalent to kinetic energy under the collision theory of matter. This shows that losing kinetic energy to the air (a "transfer" of thermal energy) is the same as a decreasing temperature.
Answer:
D
Explanation:
What is biodiversity?
Answer:
Biodiversity is the variety of life in the world or in a particular habitat or ecosystem.
Explanation:Biodiversity is the shortened form of two words "biological" and "diversity." It refers to all the variety of life that can be found on Earth (plants, animals, fungi and micro-organisms) as well as to the communities that they form and the habitats in which they live.
Final answer:
Biodiversity represents the variety and complexity of life on Earth, encompassing the many species, genetic variations, and ecosystems.
Explanation:
Biodiversity refers to the variety of life and its processes, which includes the diversity of living organisms, the genetic differences among them, and the communities and ecosystems in which they occur. The term encompasses everything from the smallest bacteria to the largest plants and animals.
While scientists have identified about 1.9 million species, it is estimated that the true number of species ranges from 5 to 30 million. This diversity can be measured at three levels: species diversity, genetic diversity, and ecosystem diversity. Biodiversity is essential as it contributes to the resilience of ecosystems and to our planet's overall health.
Absolute zero is
the freezing point of water using the Celsius scale
the freezing point of liquid nitrogen
the temperature on the Kelvin scale corresponding to 32 °F
the coldest temperature possible
the boiling point of liquid nitrogen
Absolute zero is the lowest possible temperature and is the temperature at which all molecular motion ceases. It is measured on the Kelvin scale, where water freezes at 273 K and boils at 373 K.
Explanation:Absolute zero is the lowest possible temperature and is the temperature at which all molecular motion ceases.
It is measured on the Kelvin scale, where water freezes at 273 K and boils at 373 K, with 0 K being absolute zero.
This temperature is significant in scientific work and is used in fields such as astronomy
Final answer:
Absolute zero is the theoretical temperature at which molecular motion stops, corresponding to 0 K, -273.15°C, or -459.67°F. It is the starting point of the Kelvin scale. The Celsius scale, more common in daily usage, has water's freezing point at 0°C and boiling point at 100°C.
Explanation:
Absolute zero is defined as the coldest possible temperature, a theoretical limit where all molecular motion ceases. This temperature corresponds to 0 Kelvin (K) on the Kelvin temperature scale and is equivalent to approximately -273.15 degrees Celsius (°C) and -459.67 degrees Fahrenheit (°F). The Kelvin scale is an absolute temperature scale used primarily in the sciences.
The Celsius scale is another temperature scale which is used widely around the world. On this scale, the freezing point of water is 0°C and the boiling point is 100°C at standard atmospheric pressure. This scale is more commonly used in daily life, but in scientific contexts, especially when dealing with thermodynamic temperature, the Kelvin scale is preferred because it starts from this absolute zero point.
To convert from Celsius to Kelvin, one simply adds 273.15 to the Celsius temperature. This is because the size of one unit on both the Celsius and Kelvin scales is the same; the only difference is their starting points (0°C is equivalent to 273.15K).
Noble gases are found as monatomic molecules
Answer:
nobel gass are found atmosphere
Answer:
Noble gases are found as monatomic molecules is a TRUE statement.
Explanation:
Noble gases are monoatomic elements. That is they exist as a single atom in nature.
Noble gases are the only elements which are stable at room temperature and pressure.
Except helium which has 2 valence electrons all other elements have 8 valence electrons (electrons in the outer shell) This is the reason why the noble gases are non reactive that is they are inert in nature.
It is difficult to oxidize or reduce noble gases and hence they form very few compounds.