Consider the reaction below.
Zn(s) + Cu2+ (aq)--->Zn2+ (aq) + Cu(s)
Which half reaction correctly describes the oxidation that is taking place?
A)Zn(s)--->Zn2+ (aq) +e
B)Zn(s)--->Zn2+ (aq) + 2e-
C)Cu2+ (aq) + 2e--->Cu(s)
D)Cu2+ (aq)e Cuis)
Answer:
B
Explanation:
Oxidation
Zn---> Zn2+ 2e
Reduction
Cu2+ + 2e ---->Cu
What mass of Ca(OH)2 is required to react with the acetic acid (CH3CO2H) in 25.0 mL of a solution having a density of 1.065 g/mL and containing 58.0% acetic acid by mass?
Answer:
9.53g
Explanation:
Given the following :
Density = 1.065g/mL
Volume of solution = 25.0mL
% of acetic acid =58%
Molar mass of CH3COOH = 60.05g/mol
Molar mass of Ca(OH)2 = 74.093g/mol
Reaction:
2CH3COOH + Ca(OH)2 ----> Ca(CH3Co2)2 +2H2O
Volume of solution × density × % of CH3COOH × (mole per molar mass CH3COOH) × (mole of Ca(OH)2 per mole of CH3COOH) × (molar mass of Ca(OH)2 per mole of Ca(OH)2)
25mL × (1.065/1) × (58/100) × (1 / 60.05) × (1 / 2) × (74.093 / 1)
25 × 1.065 × 0.58 × 0.0166527 × 0.5 × 74.093
= 9.526g
5. Which contains more nitrogen: 60g of urea, (NH2)2CO, or 100g of ammonium sulphate, (NH4)2SO4
Answer:
Urea contains more nitrogen
Explanation:
1 mole of Urea contains 2 moles of Nitrogen and 1 mole of ammonium sulfate contains, also, 2 moles of nitrogen.
60g of urea (Molar mass: 60g/mol) contains:
60g × (1mol / 60g) = 1 mole. As 1 mole of urea contains 2 moles of nitrogen, moles of nitrogen are 2.
100g of ammonium sulfate (Molar mass: 132g/mol) contains:
100g × (1mol / 132g) = 0.758 moles.
As 1 mole of urea contains 2 moles of nitrogen, moles of nitrogen are 0.758×2 = 1.516 moles.
That means, urea contains more nitrogen.
Urgent please help!!!!!!! Which factors add to the greenhouse effect and are caused by human activities?
Answer:
Human activities contribute to climate change by causing changes in Earth's atmosphere in the amounts of greenhouse gases, aerosols (small particles), and cloudiness. The largest known contribution comes from the burning of fossil fuels, which releases carbon dioxide gas to the atmosphere.
Explanation:
Answer:use of aerosoles
Burning of fossil fuels
Cutting down trees(this is because CO2 is used in photosynthesis)
Hope this helps
Explanation:
Consider the equation below. CaCO3(S) CaO(S) + CO2(g) What is the equilibrium constant expression for the given reaction?
Answer:
Option B. Keq = [CO2] [CaO]/ [CaCO3]
Explanation:
The balanced equation for the reaction is given below:
CaCO3(s) —> CaO(s) + CO2(g)
The expression for the equilibrium constant, Keq is simply the ratio of the concentration of the products to that of the reactants.
The expression for the equilibrium constant, Keq is given below:
Keq = [CO2] [CaO] / [CaCO3]
Answer: c) Keq= [co2]
Explanation:
edge 2023
Describe what is happening in this chemical equation: Al2(SiO3)3 + NaOH → Na(SiO3)3 + Al2OH Please Help ASAP
WILL MARK BRAINLIEST AND GIVE 5 STARS.
Answer:
Double replacement reaction
Explanation:
This is what is known as a double replacement reaction. The two parts of each molecule separate and recombine to form two new compounds. For instance, [tex]Al_2(SiO_3)_3[/tex] separates into [tex]Al_2[/tex] and [tex](SiO_3)_3[/tex], while [tex]NaOH[/tex] separates into [tex]Na[/tex] and [tex]OH[/tex], and then they recombine with the other compound.
Hope this helps!
Answer:
double replacment reaction
Explanation:
srry if it is wrong
Which statement best describes a solution containing a strong base?
A. the solution is dilute
B. The solution is concentrated
C. a small amount of the base dissociates in solution
D nearly all of the base dissociates in solution
Unit Test
Active
TIME REMAINING
1
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Which statement best describes the direction of heat flow by conduction between two samples of the same material?
Heat flows from faster molecules to slower molecules when they are near.
Heat flows from faster molecules to slower molecules when they collide.
Heat flows from slower molecules to faster molecules when they are near.
Heat flows from slower molecules to faster molecules when they collide.
Answer:
b
Explanation:
edge 2021
According to the concept of conduction,heat flows from faster molecules to slower molecules when they collide.
Conduction is defined as a process as a means of which heat is transferred from the hotter end of the body to it's cooler end.Heat flows spontaneously from a body which is hot to a body which is cold.
In the process of conduction,heat flow is within the body and through itself.In solids the conduction of heat is due to the vibrations and collisions of molecules .
There are 2 types of conduction:1) steady state conduction 2) transient conduction.According to the type of energy conduction is of three types:
1) heat conduction
2) electrical conduction
3)sound conduction
Heat is transferred from faster to slower molecules when they collide , thus the correct option is that heat flows from faster molecules to slower molecules when they collide.
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A battery has an electrical ______________ energy
Answer:
Electrical Energy
Explanation:
There are a variety of chemical and mechanical devices that are called batteries, although they operate on different physical principles. A battery for the purposes of this explanation will be a device that can store energy in a chemical form and convert that stored chemical energy into electrical energy when needed.
Which phrase describes the prime meridian
Answer:
It is a metaphorical line that divides the earth from north to south
Explanation:
What would happen to an objects potential energy as it begins moving? A) Potential energy would remain the same B) Potential energy would increase C) Potential energy would decrease D) Potential energy would disappear
Determine the pH of 0.150 M magnesium hydroxide solution
What is the dependent variable for "how does changing your laundry detergent affect how clean your clothes are?"
Dependent variables receive this name because, in an experiment, their values are studied under the supposition. The dependent variable is the cleanliness of the clothes.
What is the dependent variable ?It is something on which other elements depend. A test score, for instance, may be a dependent variable because it could vary based on a number of variables, including how much you studied, how much sleep you got the night before the test, and even how hungry you were.
A dependent variable is one that is altered as a result of the modification of an independent variable. Your independent variable "depends" on the outcome you're interested in measuring. Dependent variables are also referred to as: response elements (they respond to a change in another variable)
There are often two different sorts of variables in analytical health research. We anticipate that independent variables will have an impact on dependent variables.
Thus,The dependent variable is the cleanliness of the clothes.
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In this reaction, how many grams of O2 are required to completely react with 110 grams of Al
Answer:
98 g
Explanation:
Start with the balanced equation. Then, make a little chart under the equation showing the information you have and need.
3O₂(g) + 4Al(s) → 2Al₂O₃(s)
m ? 110 g
M ___ ____
n ___ <= ____
"m" is for mass. "M" is for molar mass (some teachers use "MM"). "n" is for the number of moles.
To find the mass of oxygen:
Calculate the molar mass of oxygen ([tex]M_{O_{2}[/tex])Calculate molar mass of aluminum ([tex]M_{Al}[/tex])Use [tex]M_{Al}[/tex] to find the moles of aluminum ([tex]n_{Al}[/tex])With [tex]n_{Al}[/tex], use the mole ratio to find the moles of oxygen ([tex]n_{O_{2}}[/tex])Use [tex]n_{O_{2}}[/tex] and [tex]M_{O_{2}}[/tex] to find the mass of oxygen ([tex]m_{O_{2}}[/tex])To find molar mass, use the atomic mass on your periodic table. For each atom of an element, add on its atomic mass.
Molar mass of aluminum (one Al atom):
[tex]M_{Al} = 26.982 g/mol[/tex]
Molar mass of oxygen (two O atoms):
[tex]M_{O_{2}} = 16.000g/mol+16.000g/mol[/tex]
[tex]= 32.000g/mol[/tex]
Update the chart:
3O₂(g) + 4Al(s) → 2Al₂O₃(s)
m ? 110 g
M 32.000 g/mol 26.982 g/mol
n ___ <= ____
Find the moles of aluminum
[tex]n_{Al} = \frac{110g}{1} *\frac{1mol}{26.982g}[/tex] Multiply mass by molar mass to find moles.
[tex]n_{Al} = \frac{110}{1} *\frac{1mol}{26.982}[/tex] The units "g" cancel out.
[tex]n_{Al} = 4.0(7)mol[/tex] Keep one extra significant figure. (110 has 2 sig. figs.)
3O₂(g) + 4Al(s) → 2Al₂O₃(s)
m ? 110 g
M 32.000 g/mol 26.982 g/mol
n ___ <= 4.0(7) mol
Find the moles of oxygen using the mole ratio, which comes from the coefficients in the balanced equation.
The mole ratio of oxygen to aluminum is 3 to 4.
[tex]n_{O_{2}} = \frac{4.0(7)mol_{Al}}{1}*\frac{3mol_{O2}}{4mol_{Al}}[/tex] Multiply moles of aluminum by the mole ratio.
[tex]n_{O_{2}} = \frac{4.0(7)}{1}*\frac{3mol_{O2}}{4}[/tex] "molAl" units cancel out.
[tex]n_{O_{2}} = 3.0(52)mol_{O2}[/tex] Keep two sig. figs. when the first is a "5"
3O₂(g) + 4Al(s) → 2Al₂O₃(s)
m ? 110 g
M 32.000 g/mol 26.982 g/mol
n 3.0(52) mol <= 4.0(7) mol
Find the mass of oxygen
[tex]m_{O_{2}} = \frac{3.0(52)mol}{1}*\frac{32.000g}{1mol}[/tex] Multiply moles by molar mass.
[tex]m_{O_{2}} = \frac{3.0(52)}{1}*\frac{32.000g}{1}[/tex] The "mol" unit cancels out.
[tex]m_{O_{2}} = 97.(6)g[/tex] Keep one sig. fig. to round. "6" rounds up.
[tex]m_{O_{2}} = 98g[/tex] <= Final answer
∴ 98 grams of oxygen are required to completely react with 110 grams of aluminum.
Which particle has no charge
Answer:
Neutron
Explanation:
Molar mass if calcium nitrate
Answer:
About 164 grams
Explanation:
The molecular formula of calcium nitrate is [tex]Ca(NO_3)_2[/tex]. The molar mass of calcium is about 40, while the molar mass of nitrogen is about 14 and oxygen is about 16. Therefore, the molar mass of it is:
[tex]40+2(14+3(16))=40+2(14+48)=40+124=164[/tex]
Hope this helps!
give chemical tests to distinguish between saturated and unsaturated compound
bromine is used to distinguish between saturated and unsaturated compounds. when bromine water is added to the unsaturated compound, bromine that added to the unsaturated compound and the red brown colour of bromine water is discharged.
Keeping in mind the rules for significant dig-
its, what is the product of 0.6906 m and 4.03
m?
Answer:
2.78
Explanation:
When multiplying, your answer will have the same amount of sig figs as the multicand or multiplier that has the lower number of sig figs. In this case, 4.03 is the one with the lowest number of sigs figs, which is 3 sig figs, so the answer should have 3 sig figs, so the answer is 2.78.
Which sentence is a scientific statement? A. There is a substance around us that cannot be detected. B. Kids should go to school for 12 years. C. Experimentation is the best way to obtain knowledge. D. Unicorns once existed on Earth. E. There are no living things on the Moon
Answer:
Experimentation is the best way to obtain knowledge.
Explanation:
This is a statement and it is scientific
Answer:
e
Explanation:
Name the following compound: CH3 – CH2 – CH2 – CH2 – CH3
Answer:
Pentane
Explanation:
En una determinación cuantitativa se utilizan 17.1 mL de Na2S2O3 0.1N para que reaccione todo el yodo que se encuentra en una muestra que tiene una masa de 0.376 g. Si la reacción que se lleva a cabo es: I2 + 2Na2S2O3 → 2NaI + Na2S4O6 ¿Cuál es la cantidad de yodo en la muestra?En una determinación cuantitativa se utilizan 17.1 mL de Na2S2O3 0.1N para que reaccione todo el yodo que se encuentra en una muestra que tiene una masa de 0.376 g. Si la reacción que se lleva a cabo es: I2 + 2Na2S2O3 → 2NaI + Na2S4O6 ¿Cuál es la cantidad de yodo en la muestra?
Answer:
La cantidad de yodo en la muestra es 0.217 g
Explanation:
Los parámetros dados son;
Normalidad de la solución de Na₂S₂O₃ = 0.1 N
Volumen de la solución de Na₂S₂O₃ = 17.1 mL
Masa de muestra = 0.376 g
La ecuación de reacción química se da de la siguiente manera;
I₂ + 2Na₂S₂O₃ → 2 · NaI + Na₂S₄O₆
Por lo tanto, el número de moles de sodio por 1 mol de Na₂S₂O₃ en la reacción = 1 mol
Por lo tanto, la normalidad por mol = 1 M × 1 átomo de Na = 1 N
Por lo tanto, 0.1 N = 0.1 M
El número de moles de Na₂S₂O₃ en 17,1 ml de solución 0,1 M de Na₂S₂O₃ se da de la siguiente manera;
Número de moles de Na₂S₂O₃ = 17.1 / 1000 × 0.1 = 0.00171 moles
Lo que da;
Un mol de yodo, I₂, reacciona con dos moles de Na₂S₂O₃
Por lo tanto;
0,000855 moles de yodo, I₂, reaccionan con 0,00171 moles de Na₂S₂O₃
La masa molar de yodo = 253.8089 g / mol
La masa de yodo en la muestra = 253.8089 × 0.000855 = 0.217 g.
HELP MEEEE! PLISSSSS
Answer:
4. Copper(II) carbonate
5. Magnesium carbonate
Explanation:
Only Potassium carbonate, Sodium carbonate and Ammonium carbonate are soluble.
The rest of the carbonates are insoluble.
One disadvantage of burning propane (C3H8) is that carbon dioxide is one of the products. The released CO2 increases the growing concentration of CO2 in the atmosphere. How many moles of water are produced when 20.0 moles of propane are burned in excess oxygen on a gas grill?
Answer:
80 MOLES OF WATER ARE PRODUCED WHEN 20 MOLES OF PROPANE ARE BURNED IN EXCESS OXYGEN ON A GAS GRILL.
Explanation:
Equation for the reaction:
C3H8 + 5 O2 ---------> 4 H2O + 3 CO2 + Heat
The above equation is in the presence of excess oxygen.
In this reaction,
1 mole of propane forms 4 moles of H2O
If 20 moles of propane were to be used, how many moles of water will be produced?
1 mole of propane = 4 moles of water
20 moles of propane = ( 4 * 20 ) moles of water
= 80 moles of water.
So, if 20 moles of propane were burned in excess oxygen, 80 moles of water will be formed. Propane is heavier than air and when properly combusted produces a large amount of heat. It is also non toxic.
80 MOLES OF WATER are produced when 20.0 moles of propane are burned in excess oxygen on a gas grill.
Chemical reaction representing the burning of propane:C₃H₈ + 5 O₂ ---------> 4 H₂O + 3 CO₂ + Heat
The above equation is in the presence of excess oxygen.
In this reaction, 1 mole of propane forms 4 moles of H₂O
1 mole of propane = 4 moles of water
20 moles of propane = ( 4 * 20 ) moles of water
20 moles of propane= 80 moles of water.
Thus, if 20 moles of propane were burned in excess oxygen, 80 moles of water will be formed.
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. In which reaction is nitric acid acting as an oxidising agent? A. CuO + 2HNO3 → Cu(NO3)2 + H2O B. Cu + 4HNO3 → Cu(NO3)2 + 2H2O + 2NO2 C. Na2CO3 + 2HNO3 → 2NaNO3 + H2O + CO2 D. NaOH + HNO3 → NaNO3 + H2O
Answer:
B. Cu + 4HNO3 → Cu(NO3)2 + 2H2O
Explanation:
A redox reaction is one in which oxidation and reduction reactions are occuring simultaneously.
In a redox reaction, an oxidizing agent is reduced ( its oxidation state decreases) whereas a reducing agent is oxidized (it's oxidation state increases).
The nitrogen in the nitrate (v) ion, NO3-, exists in the +5 oxidation state. Therefore it would be acting as an oxidizing agent in any reaction in which it's oxidation state becomes less than +5 after the reaction.
Let us then consider each of the reactions:
A. Reaction 1: in this reaction, the oxidation state of nitrogen remains +5 as what is simply an exchange of radicals in a neutralization reaction.
B. Reaction 2: in this reaction, trioxocarbonate (v) acid oxidizes Copper atom to Copper (ii) ion, while itself it is reduced to Nitrogen (IV) oxide. The oxidation state of nitrogen changes from +5 to +4
C. Reaction 3: in this reaction, what occurs is an exchange of radicals by a displacement reaction. The oxidation state of nitrogen remains the same
D. Reaction 4: in the reaction, what occurs is a neutralization reaction, and the oxidation state of nitrogen remains the same.
Therefore, the correct option is B.
The concentration of which ion is increased when LiOH is dissolved in water?
1.hydroxide ion
2.hydrogen ion
3hydronium ion
4.halide ion
Answer: (1) Hydroxide ion
Explanation: Because LiOH is a base hydroxide ion is OH-
The answer is hydroxide ion.
When the hydronium ion concentration of an aqueous solution is increased?
Using this equation, we find the pH of pure water to be 7. This is considered to be neutral on the pH scale. The pH can either go up or down depending on the change in hydronium concentration. If the hydronium concentration increases, the pH decreases, causing the solution to become more acidic.
How will the concentration of OH ions be affected when an excess weak base will be added to the concentrated HCL solution?When an excess base is dissolved in a solution of sodium hydroxide. Sodium hydroxide dissociates into OH- ions and when the number of OH- increases then concentration also increases because concentration is the number of OH- ions present per unit volume.
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What type of mixture scatters light and cannot be filtered easily?
Answer:
a colloid (heterogeneous mixture) that dispearses the particles intermediate in size.
particle size...1 to 10000nm, disperse, large molecules or aggregatesdoes not seperate on standingcannot be seperated by filtrationscatter light (Tyndall effect)Explanation:
Using the periodic table, complete the table to describe each atom. Type in your answers. A B C D E F
Answer:
e
Explanation:
Answer:
A 20
B 40
C Ca
D 10
E 9
F F
Explanation:
PLEASE HURRRYYYY
A buffer is made using HCO2Na. Which other substance should the buffer contain?
HCO2Li
HCO2H
NaNO3
HCl
Answer:
HCO₂H
Explanation:
A buffer is defined as the mixture between a weak acid and its conjugate base, or vice versa, in an aqueous solution.
The HCO₂Na (Sodium formate), is the conjugate base of formic acid, HCO₂H, a weak acid of pKa = 3.75.
Thus, to make a buffer using HCO₂Na, the other substance the buffer should contain is HCO₂H
Answer:
HCO₂H
Explanation:
How many neutrons are in one atom of the elemen, F-19?
Answer:
10
Explanation:
Answer: 10 neutrons
This isotope of fluorine has 9 protons, 9 electrons and 10 neutrons.
Explanation:
Question 4 (higher question)
Electrolysis of acidified water can produce hydrogen and oxygen.
The apparatus for the electrolysis is:
. water containing some dilute sulfuric acid
• two graphite rods
• a suitable container for the electrolysis reaction
. a suitable source of electricity
• test tubes
Describe how to use the apparatus to electrolyse acidified water, and how to test the gases to
show that they are hydrogen and oxygen. Include a diagram in your answer. [6 marks]
Answer:
Explanation:
Describe means you should recall facts, events or processes accurately. You might need to give an account of what something looked like, or what happened.
Explain means you need to make something clear, or state the reasons for something happening.
Compare means you need to describe similarities and differences between things. If you are asked to compare X and Y, write down something about X and something about Y, and give a comparison. Do not just write about X only or Y only.
Evaluate means you must use information supplied, or your own knowledge, to consider the evidence for and against or to identify strengths and weaknesses. You must then complete your answer with a conclusion, stating which is better and why, for example.