The theoretical yield of a reaction is 75.0 grams of product and the actual yield is 42.0g. what is the percent yield? 75.0 56.0 31.5 178 none of these
Diamond is made of carbon atoms attached rigidly to each other in three directions making diamond very strong. graphite, as found in a pencil, is easily broken under pressure. since graphite is also made of carbon atoms, why might it have such a different property?
The different properties of diamond and graphite can be attributed to the different arrangement of carbon atoms in each structure. Diamond has a three-dimensional network of carbon atoms, resulting in strong bonds and hardness. Graphite has a two-dimensional sheet structure, with weak bonds between the layers, making it soft and brittle.
Explanation:The different properties of diamond and graphite can be attributed to the different arrangement of carbon atoms in each structure. In diamond, each carbon atom is bonded to four other carbon atoms in a three-dimensional network, resulting in strong bonds that make diamond extremely hard and rigid. On the other hand, graphite consists of layers of carbon atoms arranged in a two-dimensional sheet structure, with weak bonds between the layers. These weak bonds allow the layers to slide over each other easily, making graphite soft and brittle.
Nitromethane (ch3no2) burns in air to produce significant amounts of heat. 2ch3no2(l)+3/2o2(g)→2co2(g)+3h2o(l)+n2(g) δhorxn = -1418 kj how much heat is produced by the complete reaction of 3.87 kg of nitromethane?
a chemist wants to combine carbon and iron to form steel. what type of bond will this chemist create between these two elements
Final answer:
The chemist will create a covalent bond between carbon and iron to form steel.
Explanation:
The chemist will create a covalent bond between carbon and iron to form steel.
Covalent bonds form when electrons are shared between atoms. In this case, carbon and iron will share electrons to form a strong bond. Steel is a type of alloy made primarily of iron and carbon, with carbon content typically between 0.2% and 2.1%.
Examples of covalent bonds include the bonding in molecules such as water (H2O), carbon dioxide (CO2), and methane (CH4).
Describe the steps involved in the Mole method
Identify the given and convert it to moles. Identify the desired, and multiply the given number of moles by the mole ratio or equation factor, to produce moles of desired substance. Convert moles of desired substance to the units asked for in the question.
Explanation:
The mole method means that the stoichiometry configuration in a chemical equation is represented as number of moles of each substance.
The following steps are involved in the Mole method:
1) Write the balanced chemical equation.
2) Convert the units of given substance(X) into moles.
3) Using the mole ratio to calculate the moles of wanted substance(Y).
4) Convert moles of wanted substance to the desired units.
For example:
Calculate the mass of MgO?
Mass of MgO = Moles of MgO*molar mass of MgO.
Calculate the moles of Mg = Mass of Mg/Molar mass of Mg.
Moles of Mg = m/24.31.
Name of the product formed by the reaction of propylide ion and 2-chloropropane?
Answer: 4-methyl-2-pentyne.
Explanation:
Overall reaction is an example for Nucleophilic substitution (SN2) alkylation of alkynes.
A cell is isotonic to its 4% dextrose solution. when moved to a 6% dextrose solution, that cell will ________.
Answer: will shrink.
Explanation:
The solutions having same osmotic pressure and hence same molar concentration are termed as isotonic. If a solution is of lower osmotic pressure it is called as hypotonic with respect to the concentrate solution. The more concentrated solution is said to be hypertonic with respect to the dilute solution.
When cell is placed in 6% dextrose solution,which is hypertonic to the contents in cell, the water will move from lower osmotic pressure in cell to higher osmotic pressure in 6% dextrose solution through semipermeable membrane and thus the cell will shrink.
Topsoil occurs in this layer, which is composed of a combination of organic debris and mineral matter
Which element will attract electrons more strongly—fluorine or carbon? explain your answer?
The property which can help us in this case is the electronegativity of atoms. Electronegativity is a measure of how strong an electron will be attracted to that atom. Well, Fluorine is the most electronegative element in the periodic table. Hence the answer is Fluorine.
If the smallest markings on a ruler are one tenth (1/10) of a centimeter, which of the following measurements could be recorded using that ruler?
A. 2.5 cm
B. 2.52 cm
C. 2.520 cm
D. 2.5200 cm
Answer:
The correct answer is the option: A. 2.5 cm
Explanation:
Hello! Let's solve this!
In a rule we see that it is divided into centimeters, they can be 15 centimeters, 20 centimeters, etc.
It is very easy to see the two centimeters, which are the largest lines. To see after two, we count the smallest stripes and we can reach 2.5 centimeters. But no more than that.
We conclude that the correct answer is the option: A. 2.5 cm
Which of the following are not grouped according to similar chemical properties?
A. Cobalt, iron, nickel.
B. Iron, copper, ruthenium.
C. Ruthenium, iridium, palladium.
D. Gold, silver, copper.
B. iron, copper, ruthenium
Answer: The correct answer is Option D.
Explanation:
Elements which belong to same group show similar chemical properties because they have same number of valence electrons.
From the given options:
Option A: Cobalt belongs to Group 9, Iron belongs to Group 8 and Nickel belongs to Group 10. Hence, they will not show similar chemical properties.
Option B: Iron belongs to Group 8, Copper belongs to Group 11 and Ruthenium belongs to Group 8. Hence, they will not show similar chemical properties.
Option C: Ruthenium belongs to Group 8, Iridium belongs to Group 9 and Palladium belongs to Group 10. Hence, they will not show similar chemical properties.
Option D: Gold, Silver and Copper belongs to the same group which is Group 11. Hence, they all will show similar chemical properties.
Thus, the correct answer is Option D.
You are investigating an organic compound you discover that it is an aromatic compound often used as flavoring what type of compound is it likely to be
A. Carboxylic acid
B. Anode
C. Aldegyde
D. Ketone
Answer:
C. Aldehyde
Explanation:
answer for Plato users
Write the complete balanced equation for the following reaction:
C7H6O + O2 yields CO2 + H2O
Explanation:
An equation that consists of same number of atoms on both reactant and product side is known as a balanced chemical equation.
For example, [tex]C_{7}H_{6}O + O_{2} \rightarrow CO_{2} + H_{2}O[/tex]
Number of atoms on reactant side are as follows.
C = 7
H = 6
O = 3
Number of atoms on product side are as follows.
C = 1
H = 2
O = 3
Therefore, to balance this chemical equation we multiply [tex]O_{2}[/tex] by 8 on reactant side. Whereas we multiply [tex]CO_{2}[/tex] by 7 and [tex]H_{2}O[/tex] by 3 on product side.
Therefore, the balanced chemical equation will be as follows.
[tex]C_{7}H_{6}O + 8O_{2} \rightarrow 7CO_{2} + 3H_{2}O[/tex]
How many atoms of carbon are present in 1.0 g of c6h12o6?
0.0055 number of atoms of carbon are present in 1.0 g of C₆H₁₂O₆ .
What do you mean by the number of atoms or mole ?
The mole concept is a convenient method of expressing the amount of a substance.
Mole is the amount of substance that contains as many elementary entities as there are atoms in exactly 12 grams of the carbon−12 isotope.
1 mole=6.022×1023 particles of matter of any chemical substance.
To calculate number of atoms of carbon present in 1.0 g of C₆H₁₂O₆ .
Given ,
mass of carbon =1.0 gm
molar mass =180.01 gm
mole(n)=?
Mole= mass/molar mass
Mole=1/180
Mole=0.0055
Hence, 0.0055 number of atoms are present in 1.0 g of C₆H₁₂O₆ .
Learn more about number of atoms ,here:
https://brainly.com/question/22540912
#SPJ2
A jewelry company has announced that they have created gold from reacting copper and carbon in a chemical process. according to dalton's atomic theory, is this possible?
Professor Whitney has a sample of lead and a sample of iron. The samples have equal mass. When Whitney heats the samples, the lead reaches a higher temperature than the iron, even though both samples absorbed the same amount of thermal energy. What can Whitney conclude from this experiment?
Why is making a peanut pretzel and cereal mixture a physical change?
What is the name of the group of elements that are unreactive gases?
Actinides series
Halogen gases
Lanthanide series
Noble gases
Answer: Option (d) is the correct answer.
Explanation:
Noble gases are the gases of group 18 which are helium, neon, argon, krypton, xenon and radon.
For example, electronic configuration of neon is [tex]1s^{2}2s^{2}2p^{6}[/tex]
These elements have completely filled shells so, they do not need to gain or lose an electron as they are stabilized.
As a result, noble gases become unreactive in nature.
Thus. we can conclude that noble gases is the name of the group of elements that are unreactive gases.
Why does the phosphorus cycle occur more slowly than both the carbon cycle and the nitrogen cycle?
Answer:
Explanation:
The phosphorous cycle is slower than carbon cycle and nitrogen cycle because phosphorous is found mainly in very small dust particles.
It moves very slowly from the deposits on land and in sediments and then it is transferred to the organism and from organism it is moved more slowly to the soil.
Then from the soil it is transferred again to the sediments. The whole process is very slow and the amount of phosphorus is also very less as compared to carbon and nitrogen cycle.
Which element on the periodic table has the lowest atomic radius?
Answer:
Helium
Explanation:
The atomic radius for Helium is 31x10⁻¹²
The atomic size decrease in the periodic table from left to right
and increases down a group (or line)
Which of the following equalities is not correct?
1 cm3 = 1 mL
1000 mm = 1 m
100 cg = 1 g
10 kg = 1 g
Answer : The incorrect option is, 10 kg = 1 g
Explanation :
The following conversion used are,
Conversion of centimeter cube to milliliters :
[tex]1cm^3=1ml[/tex]
Conversion of millimeter to meter :
[tex]1mm=0.001m[/tex]
or, [tex]1000mm=1m[/tex]
Conversion of centigram to gram :
[tex]1cg=0.1g[/tex]
or, [tex]100cg=1g[/tex]
Conversion of kilogram to gram :
[tex]1Kg=1000g[/tex]
or, [tex]10Kg=10000g[/tex]
As per question, only conversion (10 kg = 1 g) is incorrect conversion. While all the conversion are correct.
Hence, the incorrect option is, 10 kg = 1 g
Identify the reaction type for each generic chemical equation
A + B → AB: ✔ synthesis
AB → A + B: ✔ decomposition
Hydrocarbon + O2 → CO2 + H2O: ✔ combustion
AB + CD → AD + CB: ✔ replacement
Generic chemical equation for combination, decomposition, displacement and double displacement reactions are given as A+B=AB, AB=A+B,AB+C=AC+B and AB+CD=AC+BD respectively.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
Learn more about chemical equation,here:
https://brainly.com/question/28294176
#SPJ5
If you begin with 2.7 g Al and 4.05 g Cl2, what mass of AlCl3 can be produced?
Min : sec helium and nickel are classified as _____, which are pure substances that make up all kinds of matter
Helium which has a chemical formula of He is considered as a noble gas while Nickel which has a chemical formula of Ni is considered as metallic. Although both have different phases but they are both classified under the general category of “Elements”.
answer:
elements
Helium and nickel are elements, which are pure substances that can't be chemically broken down into simpler forms.
Explanation:Helium and nickel are classified as elements, which are pure substances that make up all kinds of matter. These substances cannot be broken down into simpler substances through chemical changes. Some familiar examples of elements include iron, silver, and gold. There are more than 100 known elements, of which about 90 occur naturally on Earth with the remainder having been created in laboratories.
The mole fraction of carbon dioxide (xco2) in water is 0.25. determine the molarity of co2. (assume the density of the solution is 1.0 g/ml.)
The molarity of CO2 in a water solution with a mole fraction of 0.25, assuming the density of the solution is 1.0 g/mL, is calculated to be 0.04401 M.
Explanation:To determine the molarity of carbon dioxide (CO2) in a solution with a mole fraction (xCO2) of 0.25, and a density of 1.0 g/mL, we need to use the definition of mole fraction alongside the known density of the solution. The mole fraction is the ratio of the moles of solute to the total moles in the solution. Assuming we have one liter of solution and know that the density is 1.0 g/mL, the total mass of the solution is 1000 g.
First, we calculate the total moles of the solution. Since the mole fraction of CO2 is 0.25, this means that 25% of the moles are CO2. To find the molarity of CO2, we need to find the mass of CO2 based on its mole fraction and then convert this to moles.
Since we are given the mole fraction and we know the density of the solution, we can calculate the mass of CO2 in one liter of solution. Let's assume a total of 4 moles of substance are present (as 0.25 is one-fourth). Hence, one mole of CO2 is present because the mole fraction of CO2 is 0.25. Knowing that the molar mass of CO2 is 44.01 g/mol, we find that the mass of 1 mole of CO2 is 44.01 grams. The molarity is found by dividing the moles of CO2 by the volume of the solution in liters, which gives a molarity of 0.04401 M.
Learn more about the Molarity of CO2 here:https://brainly.com/question/33895080
#SPJ3
The tendency of an element to react chemically is closely related to
Answer:
The correct answer is: the number of valence electrons
Explanation:
Valence electrons are the electrons present in the outermost electron shell of an atom, also known as the valence shell. If the valence shell is not completely filled, then it is known as an open shell.
The number of valence electrons governs the reactivity and bonding of an element, as they are involved in the chemical bond formation. Therefore, chemical elements having an open shell are reactive in nature.
Therefore, the reactivity of a chemical element is closely related to the number of valence electrons.
What type of bomb was used in Oklahoma City bombing of 1995
Final answer:
The Oklahoma City bombing on April 19, 1995, utilized a truck bomb made from ammonium nitrate fertilizer mixed with fuel oil. The terrorists hoped to incite a revolution against government control. The attack killed 168 people, injured over 600, and resulted in widespread destruction.
Explanation:
The type of bomb used in the Oklahoma City bombing of April 19, 1995, was a truck bomb. Timothy McVeigh and Terry Nichols constructed the explosive using agricultural grade ammonium nitrate fertilizer mixed with fuel oil, packing the mixture into a rented Ryder truck. This deadly attack led to the loss of 168 lives, including nineteen children, and left over 600 individuals injured. The bombing severely damaged the Alfred P. Murrah Federal Building, along with more than three hundred nearby buildings. The motivations of McVeigh were associated with a desire to start a revolution against government authority, partly in retaliation for the Waco siege that occurred exactly two years prior.
The aftermath of the bombing united Americans across the country, bringing forth an outpouring of generosity and support for the victims and their families. President Bill Clinton's speech helped galvanize the nation towards unity and reconciliation. In response to this tragedy, there was bipartisan government action which included support for the affected and enhanced funding for antiterrorism efforts, aiding in the prevention of future attacks of a similar nature.
When snow melts does its volume decrease or increase?
The volume of the snow decreases. This had happened because the snow is made up or comprised of water (H2O) and oxygen (O). When the snow starts melting, the air inside the snow discharges into the atmosphere and the water turn out to be a puddle on the ground.
Calculate the ph of 0.63 m nh3 (kb=1.8×10−5).
Annabeth has 7.2 cups of cookie batter, represented by this model. If each cookie uses 0.45 cup of batter, how many cookies can annabeth make?