Answer:
The answer is b. It is less than 890 kJ/mol, and the amount of energy required to break bonds is less than the amount of energy released in forming bonds.
Explanation:
i just took the test sorry i could not help you before but i hope this helps someone!
The statement which is correct about H for the products and the comparison of the energy in bonds is that the amount of energy required to break bonds is less than the amount of energy released in forming bonds.
What is a Bond?This is defined as an attraction between atoms, molecules etc which enables the formation of chemical compounds.
Since is less than 890 kJ/mol , the amount of energy required to break bonds is less than the amount of energy released in forming bonds thereby making option A the most appropriate choice.
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Which environment has lower temperatures at higher elevations?
A: Desert
B: Grassland
C: mountain
D: Swamp
Q1 and Q1 represent ?
Answer:yes they do represent
In the following reduction of iron ore, 3C + 2Fe2O3 → 4Fe + 3CO2, iron is reduced and _______ is oxidized.
A)
carbon
B)
carbon dioxide
C)
oxygen
D)
iron oxide
Al + AgNO3 -> Al(NO3)3 + Ag. As a balanced equation
Answer:
Al + 4AgNO3 >>Al(NO3)3+ 3Ag
Explanation:
the number of moles of No3 of the products is 3 therefore we have to balance the reactants by adding 3 before the "AgNO3" which also leades us to adding 3 mols to Ag on the products side
A sample of an unidentified compound contains 29.84% sodium, 67.49% chromium, and 72.67% oxygen. What is the compound's empirical formula? If the molar mass of the molecular formula is 523.96 g/mol, find the molecular formula.
Empirical Formula:
Molecular Formula:
Answer:
i would help i just dont know sorry
Explanation:
Help! Locks at 12
Given the balanced equation representing a nuclear reaction:
Which particle is represented by X?
Answer is #4 (neutrons)
Explanation:
Total mass before the reaction is 236 amu. The total mass of the two elements is 233 amu. This means that there are 3 amus carried by element X. Looking at the total atomic number of the two elements after reaction, it's 92, the same as the one at the beginning. This means that element X has zero atomic number, which could only be a neutron.
Answer: is 4
Explanation:
I was doing the same one
In the diagram, which organism is a primary consumer?
clover
owl
rabbit
hawk
Answer:
Rabbit they eat plants for energy
Explanation:
Answer:
Clover
Explanation:
A clover is the only organism that makes its own food, usually from the sun. The other three need to eat to get their energy. Rabbits eat plants, owls eat insects, and hawks eat other types of animals such as fish.
A mixture of gases with a pressure of 900 mm Hg contains 20% of oxygen and 80% of nitrogen by volumeWhat is the partial pressure of the oxygen gas in the mixture?
A-45mmHg
B-180mmHg
C-210 mmHg
D-320 mmHg
Answer:
180 mmHg
Explanation:
Total volume of gases = 20% + 80%= 100%
Total pressure of gases = 900 mm Hg
Note that partial pressure of a gas = mole fraction × total pressure
Mole fraction of oxygen = 20/100
Hence partial pressure of oxygen= 20/100 × 900 mm Hg
partial pressure of oxygen= 180 mmHg
!
Hormones keep our bodies in a state of
balance known as
(a)metabolism
(b)homeostasis
Chromatography and fractional distillation can be used to separate compounds.
In which type of separation is a thermometer needed for checking that complete separation has
occurred?
A chromatographic separation of two colourless solids
B chromatographic separation of two solids of different colours
C fractional distillation of two colourless liquids
D fractional distillation of two liquids of different colours
Answer:
fractionao distillation of two colourless liquids
when electrical energy is converted into any other deform of energy, the total amount of energy
To determine whether Gd-daa3 is selective for Zn2 , researchers compared relaxivity measurements of Gd-daa3 in the presence of different cations. Varying amounts of XCl2 (where X is Zn, Ca, or Mg) were added to a 0.1 mM solution of Gd-daa3 plus 10 mM KCl/10 mM HEPES buffer at pH 7.4. What is the most appropriate control for this experiment
How many molecules of HCl are needed to react with 1.7 moles of magnesium. The products of
the reaction are magnesium chloride and hydrogen gas.
2HCl + Mg --> MgCl2 + H2
(pls help)
Answer:
2.05 x 10²⁴ molecules
Explanation:
The balanced equation for the chemical reaction is the following:
2 HCl + Mg → MgCl₂ + H₂
According to the equation, 2 moles of HCl are required to react with 1 mol of magnesium (Mg), so the moles of HCl required to react with 1.7 mol Mg are calculated as follows:
moles HCl = 1.7 mol Mg x 2 mol HCl/mol Mg = 3.4 mol HCl
We know that 1 mol of any compound is equal to 6.022 x 10²³ molecular entities, so we convert the moles of HCl to molecules as follows:
molecules HCl = 3.4 mol HCl x 6.022 x 10²³ molecules/1 mol = 2.05 x 10²⁴ molecules
A haloalkane 'X' if heated with sodium metal in presence of dry ether produces
2,3 - dimethyl butane
as major product
Identify x with chemical reaction.
Answer:
2 halo - propane
Explanation:
We are told that a halo alkane is heated with sodium in the presence of dry ether to produce 2,3 - dimethyl butane.
Now, according to Wurtz reaction this formation from heating with sodium in the presence of dry ether is done by 2 alkyl halides in the form of;
2RX + 2Na → R−R + 2Na+X−
Now, formula for 2,3 dimethyl butane is (CH₃)₂CHCH(CH₃)₂
Thus, from the Wurtz reaction, we can write that;
2RX + 2Na → (CH₃)₂CH - CH(CH₃)₂ + 2Na+X−
So, R = (CH₃)₂CH
This means the original halo alkane has 3 carbon atoms and thus, we can say it is 2 halo - propane.
Why does a star not explode if it is undergoing reactions similar to hydrogen bombs?
Answer:
because it is made up of hydrogen
A star not explode if it is undergoing reactions similar to hydrogen bombs because the fusion processes' outward pressure prevents the stars from collapsing. The gravitational pull prevents the stars from bursting from within.
What is fusion ?When two atoms collide to create a heavier atom, such as when two hydrogen atoms combine to create one helium atom, this process is known as fusion. The sun is powered by a similar mechanism, which generates vast amounts of energy.
Because of the enormous weight of the gas overhead, the Sun doesn't explode. The pressure caused by all the energy generated is precisely balanced.
The Sun would begin to collapse if the pace of fusion decreased, resulting in less energy being created in the sun's core.
Thus, The gravitational pull prevents the stars from bursting from within.
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If the limiting reactant in a chemical reaction is impure, what will happen to the percentage yield of the product?
Answer:
it may also become impure,I think.
What can a drop of liquid mercury be described as?
a pure substance and a compound
an impure substance that is reactive
an impure substance that is unreactive
a pure substance and an element
Answer:
a pure substance and an element”
Explanation:
what pressure must be applied to compress a gas from 85 L at 3.5 atm to 15 L? a-17.3atm b-24.7atm c-19.8atm d-21.4atm
Calculate the atomic mass of Nitrogen if the two common isotopes of Nitrogen have masses of 31.972 amu (85.00 %
abundance) and 33.967 amu (15.00% abundance)
Explanation:
hope the picture above help u understand:)
4. (08.01 MC)
Which of the following describes a unique property of water that helps sustain marine life? (5 points)
It freezes upward from the bottom unlike other liquids that freeze downward from the top.
It has a lower density in its solid state than it does in its liquid state.
It shows changes in density at temperatures above 4 °C.
Am It cools faster and heats up faster than most other liquids.
Answer:
It has a lower density in its solild stae than it does in its liquid state.
Explanation:
Ice floats, allowing life underneath to leave despite the top freezing.
The statement that describes a unique property of water that helps sustain marine life is that has a lower density in its solid state than it does in its liquid state.
What are the unique properties of water?Water is a unique molecule that possesses unique properties as follows:
Water is polarWater is an excellent solventWater has high heat capacityWater has high heat of vaporizationWater has cohesive and adhesive propertiesWater is less dense as a solid than as a liquidThese unique characteristics of water helps aquatic organisms sustain life in a marine environment.
Therefore, statement that describes a unique property of water that helps sustain marine life is that has a lower density in its solid state than it does in its liquid state.
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Geef de systematische naam van P2S3
The question is: Give the systematic name of [tex]P_{2}S_{3}[/tex].
Answer: The systematic name of [tex]P_{2}S_{3}[/tex] is diphosphorus trisulfide.
Explanation:
As the chemical formula of given compound is [tex]P_{2}S_{3}[/tex]. This sows that there are two phosphorus atoms so a prefix "di" will be added before the name of phosphorus atom.
Whereas there are three sulfur atoms present here. So, a prefix "tri" will be added before naming the sulfur atom. As sulfur is the anion so a suffix '-ide' will be added to its name.
Hence, name of the compound [tex]P_{2}S_{3}[/tex] is diphosphorus trisulfide.
Thus, we can conclude that the systematic name of [tex]P_{2}S_{3}[/tex] is diphosphorus trisulfide.
how many molecules are in 3cacl2
Answer:
The molar mass and molecular weight of 3CaCl2 is 332.952.
the color change of an indicator is used to determine
Answer:
Whether a solution is acidic or basic can be measured on the pH scale. When universal indicator is added to a solution, the color change can indicate the approximate pH of the solution. Acids cause universal indicator solution to change from green toward red. ... Acidic solutions have a pH below 7 on the pH scale.
Explanation:
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In the diagram below, what will allow more solute to be dissolved in the
solvent?
Answer:
missin a diagram buddy
Explanation:
How many grams H2 are needed to react with 2.80 g of N2?
Answer:
N2 +3 H2 → 2 NH3
so we have 2180 g of N2
or 2.80 g ÷ 28.02 g/mol = 0.100 mol
1 mol of N2 react with 3 moles of H2
Therefore 0.100 mol of N2 react with 0.3 moles of H2
0.300 mol X Molar mass (2.00 g/mol) = 0.600 g
0.600 g of H[tex]_2[/tex] are needed to react with 2.80 g of N[tex]_2[/tex]. Mole is one of the International System for Units' seven foundation units (SI).
What is mole?A mole is just a measuring scale. In reality, it is one of the International System for Units' seven foundation units (SI). When already-existing units are insufficient, new ones are created. Using absolute amounts of atoms, molecules, or ions would be problematic as well since chemical reactions frequently occur at levels that use grams would be inappropriate.
A mole consists of precisely 6.022140761023 particles. The "particles" might be anything, from tiny things like electrons and atoms to enormous things like stars or elephants.
N[tex]_2[/tex] +3 H[tex]_2[/tex] → 2 NH[tex]_3[/tex]
2.80 g ÷ 28.02 g/mol = 0.100 mol of N[tex]_2[/tex]
1 mol of N[tex]_2[/tex] react with 3 moles of H[tex]_2[/tex]
0.100 mol of N[tex]_2[/tex] react with 0.3 moles of H[tex]_2[/tex]
0.300 mol X Molar mass (2.00 g/mol) = 0.600 g of H[tex]_2[/tex]
Therefore, 0.600 g of H[tex]_2[/tex] are needed to react with 2.80 g of N[tex]_2[/tex].
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Que cantidad de solvente se necesita para obtener una solucion al 20% cuando se mezclan 600mg de alcohol.
Answer:
[tex]m_{solvente}=2400mg[/tex]
Explanation:
¡Hola!
En este caso, con la información dada, es posible inferir que este problema es acerca del porcentaje en masa del soluto y que se calcula de la siguiente manera, en términos de la masa de soluto y solución:
[tex]\% m=\frac{m_{soluto}}{m_{solucion}} *100\%[/tex]
De este modo, como conocemos el porcentage y la masa del soluto, podemos calcular la masa de la solución primero:
[tex]m_{solucion}=\frac{m_{soluto}}{\% m} *100\%\\\\m_{solucion}=\frac{600mg}{20\%} *100\%\\\\m_{solucion}=3000mg[/tex]
Esto quiere decir que la masa del solvente es:
[tex]m_{solvente}=m_{solucion}-m_{soluto}\\\\m_{solvente}=3000mg-600mg\\\\m_{solvente}=2400mg[/tex]
¡Saludos!
What are 1A, 3B, and 7A examples of on the periodic table?
groups.
numbers
periods
O rows
Answer: Groups
Explanation:
I took the quiz
PLEASE HELP. requires 35 mL of NaOH(aq) to neutralize
10. mL of 0.10 M HCl(aq). The concentration of the NaOH(aq) is
Answer:
0.0286M
Explanation:
Using the formula as follows:
CaVa = CbVb
Where;
Ca = concentration of HCl acid (M)
Cb = concentration of NaOH base (M)
Va = volume of HCl acid (mL)
Vb = volume of NaOH base (mL)
According to the information provided in this question;
Ca = 0.10 M
Cb = ?
Va = 10mL
Vb = 35mL
Using CaVa = CbVb
Cb = CaVa/Vb
Cb = (0.10 × 10) ÷ 35
Cb = 1 ÷ 35
Cb = 0.0286M
summarize what you know about carbon
Answer:
Carbon is a chemical element, like hydrogen, oxygen, lead or any of the others in the periodic table. Carbon is a very abundant element. It exists in pure or nearly pure forms – such as diamonds and graphite – but can also combine with other elements to form molecules.
What is the concentration of a solution containing 0.32 moles of NaCl in 3.4 liters?
Answer:
To get the molarity we need to divide the number of moles of NaCl by the volume of the solution. So, 0.32 moles NaCl divided by 3.4 L, and that gives 0.094 M NaCl.
