Answer:
Eggshell is made almost entirely of calcium carbonate
Explanation:
2 upper N upper o upper c l double-headed arrow 2 upper N upper O (g) plus upper C l subscript 2 (g).
At equilibrium, the concentrations are as follows.
[NOCl] = 1.4 ´ 10–2 M
[NO] = 1.2 ´ 10–3 M
[Cl2] = 2.2 ´ 10–3 M
What is the value of Keq for the reaction expressed in scientific notation?
1.6 ´ 10–5
6.2 ´ 10–4
6.2 ´ 104
1.6 ´ 105
Answer:
1.6x10^–5
Explanation:
Step 1:
The balanced equation for the reaction.
This is illustrated below:
2NOCl <=> 2NO + Cl2
Step 2:
Data obtained from the question.
[NOCl] = 1.4x10^–2 M
[NO] = 1.2x10^–3 M
[Cl2] = 2.2x10^–3 M
Equilibrium constant, K =?
Step 3:
Determination of the equilibrium constant.
The equilibrium constant for the above equation can be written as:
K = [NO]^2 [Cl2] / [NOCl]^2
Inputing the values of the [NO], [Cl2] and [NOCl], the equilibrium constant is:
K = [NO]^2 [Cl2] / [NOCl]^2
K = (1.2x10^–3)^2 x (2.2x10^–3) / (1.4x10^–2)^2
K = 1.6x10^–5
Answer:
A
Explanation:
Why is sexual reproduction beneficial
classify each process as exothermic or endothermic.
Evaporation of alcohol from skin: liquid C3H8O+5.2 kJ 》 vaporized C3H8O. Burning of propane ina gas grill: C3H8+5O2 》 3CO2+4H2O+1652 kJ. Oxidation of iron to form rust: 4Fe+3O2》2Fe2O3+2221 kJ.
1. Endothermic reaction
2. Exothermic reaction
3. Exothermic reaction
Explanation:
1. Evaporation of alcohol from the skin, here the heat is absorbed by the alcohol so that it gets evaporated from the skin and it is an endothermic process. As the reaction says that, the energy is added to the system, so it is endothermic.
C₃H₈O + 5.2 kJ → C₃H₈O(g)
2. Burning of propane in a gas grill:
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O + 1652 kJ.
Here energy is released or given out which is termed as exothermic reaction.
3. Oxidation of iron to form rust:
4 Fe + 3O₂ → 2 Fe₂O₃ + 2221 kJ.
Here also energy is released along with the products, so it is termed as exothermic reaction.
Whenever energy is absorbed, the reaction is endothermic in contrast if the energy is released then the reaction is exothermic.
Answer:
endothermic
exothermic
exothermic
Explanation:
True
False
1. The phenolphthalein indicator is not affected by the pH of the
solution.
Answer:
the answer is False.
Explanation:
the indicator solution is directly related to the PH. When the solution becomes neutral (ph 7), the indicator will become clear.
The statement that Phenolphthalein is not affected by PH is False
Phenolphthalein is a colorless chemical compound, when added to alkaline solutions it will turns pink, which means it has been affected by the PH.Phenolphthalein will remain colorless if in acidic solution, that's less than PH of 7. But at pH level of 8.2 it turns pink then at pH 10 it turns magenta.Therefore, PH do affect Phenolphthalein indicator
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Can someone please help me ASAP
The molarity of a solution prepared by dissolving 17.0 g of hydrochloric acid (HCl (aq)) in 133 mL of water is ___ M (2 decimal place).
The molarity is 3.50 M/L.
Explanation:
Molarity is found to know the amount of the solute ions present in the given volume of solution. So we determine it using the ratio of the moles of solute to the volume of the solution.
As here the weight of the solute which is hydrochloric acid is given as 17g, so we need to find the moles of it. This can be done by dividing the given amount of HCl with the molecular weight of HCl.
Molecular weight of HCl = 1.01 + 35.45 = 36.46 g/mol
So the number of moles of HCl present here will be
[tex]No.of moles = \frac{17}{36.46} =0.466[/tex]
So, 0.466 moles of HCl is present in the solution.
[tex]Molarity = \frac{No.of moles of solute}{Volume of solution} = \frac{0.466}{133*10^{-3} }[/tex]
[tex]Molarity = 3.50 M/L[/tex]
Thus, the molarity is 3.50 M/L.
Which catalyzed reaction breaks up ozone? 2H2O2(l) right arrow with upper M n upper O subscript 2 above it. 2H2O(l) + O2 O3 + O Right arrow with upper C upper S above it. 2O2 2H2O2 (aq) Right arrow with upper P t subscript 3 above it. 2H2O(l) + O2 O2 + 2SO2Right arrow with upper N upper O above it. 2SO3
Answer: B
Explanation: The answer is B
The balanced equation of the decomposition reaction of ozone is written as below:
[tex]\rm O + O_{3} \rightarrow 2O_{2}[/tex]
Hence, option b is correct.
What is ozone ?Ozone is a toxic gas formed by the combination of atmospheric oxygen with nascent oxygen gas. Ozone exists as a layer in the stratospheric layer of the atmosphere.
Ozone protects earth from harmful UV rays. Decomposition of ozone results in depletion of ozone layer which leads to the UV radiation reaching intensely to the earth's surface.
The oxygen gas formed from the decomposition of ozone further reacts with sulphur gas as written above produce harmful sulphur dioxide. Sulphur dioxide further reacts with water forms sulphuric acid causes acid rain.
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5.54 moles of AgNO3 are dissolved in 0.48 L of water. What is the molarity of the AgNO, solution?
Answer:
11.54 M
Explanation:
In this case, all we have to do is to apply the following expression:
M = n/V
M: molarity
n: moles
V: volume of solution in liters
In this case, we can assume that the volume of water will be the volume of solution. This is because the problem is not specifing if the moles of AgNO3 are liquid or solid, so we can make a safe assumption of the volume.
Using the expression above we have:
M = 5.54 / 0.48
M = 11.54 M
This is the molarity of solution
Answer:
the molarity of the AgNO₃ is 11.5417 mol/L
Explanation:
Given:
nAgNO₃ = 5.54 moles
V = 0.48 L
Question: What is the molarity of the AgNO₃, solution, M = ?
To calculate the molarity, the number of moles must be divided by the volume of the solution.
[tex]M=\frac{n}{V} =\frac{5.54}{0.48} =11.5417mol/L[/tex]
Determine the molecular weight of H2O.
189
18.0 g
18.019
18.016 9
Answer:
18.01534
The last one
Explanation:
The molar mass of H20 is 15.9994+(2 x 1.00797) which equals 18.01534 grams/mole.
The volume of a cube that measures 10cm in length, 10 cm in width, and 10 cm in height is 1 L. True of False
Answer: False
Explanation:
1 Cubic centimeter (cm³) = 0.001 liter (L).
Volume of = 10 x 10 x 10 = 1000cm³
To convert cubic centimeters to liters, multiply the cubic centimeter value by 0.001 or divide by 1000.
Answer:
volume of this cube = 1000 cc which is 1 L
so true
Balance this equation:
Suppose an atom gains an e-. What will be the overall electrical charge? What if an atom loses one e-?
How many molecules of ATP may be produced from glucose
Explanation:
38 ATP molecules May be produced from glucose
In aerobic respiration, which occurs in the presence of oxygen, one molecule of glucose can produce a maximum of 36 to 38 molecules of adenosine triphosphate (ATP) through the process of cellular respiration. This process involves several steps, including glycolysis, the Krebs cycle, and oxidative phosphorylation.
During glycolysis, which takes place in the cytoplasm, two molecules of ATP are produced directly from one molecule of glucose. The remaining ATP molecules are generated during the later stages of cellular respiration.
In the Krebs cycle and oxidative phosphorylation, the breakdown products of glucose undergo further chemical reactions that release energy. This energy is then used to produce ATP through a process called oxidative phosphorylation, which occurs in the mitochondria.
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The boundaries of a watershed are determined by
Select one:
A- soil type
B- the kinds of plants found in the area
C- the amount of water that flows
D- elevation
please answer quickly !
Answer:
elevation
Explanation:
If 6.42 g of water is produced, how many grams of oxygen gas reacted?
Answer:
5.76g
Explanation:
2H2 + O2 => 2H2O
Molar mass of H2O = 18g/Mol
No of mole of H2O = 6.42/18 = 0.36 moles of water.
1 mole of O2 gives 2 moles of water.
Xmole of O2 gives 0.36 moles of water.
X = 0.36/2 = 0.18 mole
Molar mass of O2 = 32g/mol
Mass = 32 × 0.18 = 5.76g.
name the hydrocarbons
Answer:
Hexane
Explanation:
This is a simple Alkane with six cabrons therefore the prefix "Hex-" is applied. Since the molecule has no double bonds it will have the ending "-ane"
Answer:
Hexane
Explanation:
what is the coefficient for calcium oxide? CaO(s) + CO2(g) → CaCO3(s)
Answer:
The coefficient is 1
Explanation:
CaO(s) + CO2(g) -> CaCO3(s)
In the balanced equation, the coefficient for CaO is 1
The coefficient represents the number of moles of a compound in the stoichiometry of the reaction
Final answer:
The coefficient for calcium oxide in the reaction CaO(s) + CO₂(g) → CaCO₃(s) is 1. The reaction is in stoichiometric balance, with each reactant and product having a coefficient of 1, indicating a 1:1:1 molar ratio.
Explanation:
The coefficient for calcium oxide in the equation CaO(s) + CO₂(g) → CaCO₃(s) is 1. In chemical reactions, the coefficients indicate the number of moles of each substance involved in the reaction. In this case, one mole of calcium oxide reacts with one mole of carbon dioxide to produce one mole of calcium carbonate, making the coefficient for each reactant and product 1. This balanced equation represents a stoichiometric relationship, meaning the number of atoms for each element is conserved.
Moreover, understanding the reaction between calcium oxide and water or carbon dioxide and water provides important context. Calcium oxide reacts with water to form calcium hydroxide (Ca(OH)₂), and carbon dioxide reacts with water to form carbonic acid (H₂CO₃). However, these are separate reactions from the one in the question. The decomposition reaction of calcium carbonate into calcium oxide and carbon dioxide is represented by the equilibrium equation: CaCO₃ (s) ⇌ CaO (s) + CO₂ (g). This equilibrium illustrates that the reaction can proceed in both the forward and reverse directions, and under certain conditions, can achieve a 100% yield of calcium oxide if the carbon dioxide is continuously removed.
____Zn(s) + ____HCl(aq) → ____ZnCl2(s) + ____H2(g)
Hey there!
Assuming you want us to balance the equation:
Zn + HCl → ZnCl₂ + H₂
Balance Zn.
1 on the left, 1 on the right. Already balanced.
Balance H.
1 on the left, 2 on the right. Add a coefficient of 2 in front of HCl.
Zn + 2HCl → ZnCl₂ + H₂
Balance Cl.
2 on the left, 2 on the right. Already balanced.
Our final balanced equation:
Zn + 2HCl → ZnCl₂ + H₂
Hope this helps!
Will a precipitate form if you mix barium chloride and potassium carbonate?
Potassium carbonate reacts with barium chloride to precipitate insoluble barium salts that is barium carbonate, when the solutions are mixed together you'll see white precipitate that is barium carbonate and potassium is dissolve in the solution to form potassium chloride.
Which type of bond is present within a water molecule
Answer:
Covalent bonds
Explanation:
4. Draw a Lewis dot diagram of Lithium bonding with Fluorine. How many electrons moved?
One lithium (Li) atom can combine with one fluorine (F) atom. Together, they make the formula LiF. Fluorine has seven electrons of it's own. Lithium gives up its one electron to make both atoms happy. So the fluorine atom has eight electrons, and a filled outer shell.
An image is attached for reference.
need help
Two objects (A and B) of the same temperature are in contact with each other.
Which statement is true?
Although the molecules collide, no heat transfers because there is no temperature difference between the objects.
Heat transfers from object B to object A, because molecules from B collide with those from A.
Heat transfers from object A to object B, because molecules from A collide with those from B.
No heat transfers, because there are no collisions between the molecules of the objects.
Answer:
The answers are either 1 or 4
Explanation:
I am pretty dure it is 1
If two objects A and B of same temperature are in contact with each other, there will be no transfer of heat. Hence, option A is true.
Heat TransferHeat is the transfer of energy from one object to another, for this transfer it is necessary that there is difference between the temperature of the objects.
In this question the objects A and B of the same temperature are in contact with each other, and the law of transfer of heat energy says without temperature difference there will be no heat transfer, hence the option A which says "Although the molecules collide, no heat transfers because there is no temperature difference between the objects" is correct.
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A bag of potato chips is sealed in a factory near sea level. The atmospheric pressure at the factory is
0.82 millimeters of mercury (mm Hg). The pressure inside the bag is the same. What is the pressure
inside the bag of potato chips in Pascal's (Pa)?
Answer: The pressure inside the bag of potato chips in Pascal's is 109
Explanation:
Pressure of the gas is defined as the force exerted by the particles on the walls of the container. S.I unit of pressure is pascal.
Thus units of pressure can be mm Hg or atmosphere or bar or Pascal.
Given : Pressure inside the bag is the same as atmospheric pressure at the factory = 0.82 mmHg
Pressure 760 mm Hg = 101325 Pa
0.82 mm Hg = [tex]\frac{101325}{760}\times 0.82=109Pa[/tex]
Thus the pressure inside the bag of potato chips in Pascal's is 109
Final answer:
The pressure inside the bag of potato chips, sealed at 0.82 mm Hg, is equivalent to 109.324 Pascals (Pa) when converted using the factor 1 mm Hg = 133.322 Pa.
Explanation:
The pressure inside a bag of potato chips, if sealed at 0.82 mm Hg near sea level, can be converted to Pascals (Pa). As the conversion factor between mm Hg and Pa is 1 mm Hg = 133.322 Pa, we simply multiply the given pressure in mm Hg by this factor to obtain the pressure in Pascals.
To calculate the pressure in Pascals:
Multiply the pressure in mm Hg by 133.322 Pa/mm Hg.
So, the pressure inside the bag in pascals is:
Pressure in Pa = 0.82 mm Hg × 133.322 Pa/mm Hg
Pressure in Pa = 109.324 Pa
Therefore, the pressure inside the bag of potato chips is 109.324 Pascals (Pa).
Calculate the pH of a solution of 0.25M H2SO4
Answer:
im pretty sure its 1.3 if its wrong sorry
Explanation:
how many elements are in NH3
Answer:
2 elements.
Explanation:
N is your Nitrogen and H is your Hydrogen. Elements are just one specific kind of atom. You have two elements with names Nitrogen and Hydrogen. Therefore, you have two elements.
Answer:
2
Explanation:
Ammonia is composed of one nitrogen atom and 3 hydrogen atoms
N= Nitrogen
H3= 3 of Hydrogen
How much heat (in Joules) is needed to raise the temperature of 257g of ethanol (cethanol=2.4 J/g°C) by 49.1°C?
Answer:
Q = 30284.88 j
Explanation:
Given data:
Mass of ethanol = 257 g
Cp = 2.4 j/g.°C
Chnage in temperature = ΔT = 49.1°C
Heat required = ?
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
Now we will put the values in formula.
Q = 257 g× 2.4 j/g.°C × 49.1 °C
Q = 30284.88 j
How many grams of chlorine gas are needed to
react with 3.50 liters of a 1.70 molar potassium
bromide solution?
Cl2 + 2KBr — 2KCI + Br
Answer:
answer pl
please
because I
A solution in which the [H+] is greater than [OH-] is called
Answer: Acidic Solution
Explanation:
An acidic solution is one that has more hydrogen ion (H+) than OH - concentration.
What are the spectator ions in this equation?
H+ and OH-
H+ and Ba2+
Upper C r upper O subscript 4 superscript 2 minus. and Upper O upper H superscript minus.
Upper C r upper O subscript 4 superscript 2 minus. and Upper B a superscript 2 plus.
The given question is incomplete. The complete question is :
What is the net ionic equation for the following reaction?
[tex]H_2CrO_4+Ba(OH)_2[/tex]
Answer : The spectator ions are [tex]Ba^{2+}[/tex] and [tex]CrO_4^{2-}[/tex]
Explanation:
Neutralization is a chemical reaction in which an acid and a base reacts to form salt and water.
Spectator ions are defined as the ions which does not get involved in a chemical equation or they are ions which are found on both the sides of the chemical reaction present in ionic form.
The given chemical equation is:
[tex]2H^+(aq)+CrO_4^{2-}(aq)+Ba^{2+}(aq)+2OH^-(aq)\rightarrow Ba^{2+}(aq)++CrO_4^{2-}(aq)+H_2O(l)[/tex]
The ions which are present on both the sides of the equation are barium and chromate ions. and hence are not involved in net ionic equation.
Hence, the net ionic equation is [tex]H^++OH^-\rightarrow H_2O[/tex]
Answer:
D
Explanation:
On edge
PLEASEEE HELPPP I BEGG FOR HELPP GUYS PLEASEE
The oxygen atom is an extremely strong _____________________.
A) reducing agent B) oxidizing agent C) anion D) cation
Answer:
oxidizing agent!
Explanation:
i hope this helps
Answer:
Oxygen is a A) oxidizing agent.
Explanation:
An element that is reduced is an oxidizing agent, because the element gains electrons. Oxygen is very electronegative and wants electrons to complete its valence shell. When electrons are gained, the oxygen is reduced. The oxygen is thus an oxidizing agent.