Answer:
I have two methods to distinguish between concentrated and dilute nitric acid
Method 1: Using magnesium/manganese.
Mg + 2HNO₃ (1%) → Mg(NO₃) + H₂
very very dilute
Mg + 4HNO₃ → Mg(NO₃)+ 2H₂O +2NO₂
concentrated
In the first reaction of magnesium with concentrated nitric acid, hydrogen is evolved.
In the second reaction of magnesium with very very dilute nitric acid, water is evolved.
Using the respective tests for hydrogen and water, we can test them.
Method 2: Using iron.
3 Fe + 8HNO₃→ 3Fe(NO₃)₂ + 4H₂O + 2NO
dilute
Fe + 6HNO₃→ Fe(NO₃)₃ + 3H₂O + 3NO₂
concentrated
In the first case of method 2,
Fe(NO₃)₂ ⇆ Fe²⁺ + (NO₃) ⁻ Iron with valency 2+ is formed
In the second case of method 2,
Fe(NO₃)₃ ⇄ Fe³⁺ + (NO₃) ⁻ Iron with valency 3+ is formed
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QUICK IM BEING TIMED
What measurement would answer your question better, “final height of plants” or “rate of growth”?
Choose one answer.
a. Final Height of Plants
b. Rate of Growth
Answer:
B) rate of growth I'd say
Explanation:
it sounds better I don't think anyone would use height of plants if they want to sound professional
You have two containers at 25°C and 1 atm. One has 22.4 L of hydrogen gas, and the other has 22.4 L of oxygen gas.
Which statement is true?
The hydrogen gas container has more molecules than the oxygen gas container.
The oxygen gas container has more molecules than the hydrogen gas container.
Both containers have the same number of molecules.
Both containers contain 6.022×1023 molecules of gas.
Both containers have the same number of molecules= 5.62 x 10²³
Further explanationGiven
22.4 L of hydrogen gas
22.4 L of oxygen gas
25°C and 1 atm.
Required
true statement
Solution
Conditions at T 25 ° C and P 1 atm are stated by RTP (Room Temperature and Pressure). Vm in this condition = 24 liters / mol
and from Avogadro's Law :
At the same temperature and pressure, the ratio of gas volume will be equal to the ratio of gas moles
So two gas have the same molecules
1 mol = 6.02 x 10²³ molecules
24 L = 1 mol, so for 22.4 L :
[tex]\tt \dfrac{22.4~L}{24~L}\times 6.02\times 10^{23}~molecules=5.62\times 10^{23}~molecules[/tex]
Question 15 of 25
What is the standard cell notation of a galvanic cell made with aluminum and
magnesium?
A. Al3+(aq) | Al(s) || Mg(s) | Mg2+(aq)
B. Mg2+(aq) | Mg(s) || Al(s) | A13+(aq)
C. Mg(s) | Mg2+(aq) || A13+(aq)| Al(s)
D. Al(s) | Al3+(aq) || Mg2+ (aq) | Mg(s)
SUBMIT
The standard cell notation of a galvanic cell made with aluminum and magnesium is option A. Al3+(aq) | Al(s) || Mg(s) | Mg2(aq).
The right side is the cathode and the left side is the anode. The cell is represented by the convention that the metal is written first, then the metal ions present in the electrolyte. And these two should be separated by a vertical line. Zinc becomes the cathode of the galvanic cell.
Galvanic cells consist of two different metal electrodes connected by a conductive solution electrolyte, which are also connected externally to complete an electrical circuit. Cell notation or cell representation in chemistry is a simple way of representing reactions in an electrochemical cell. The silver half-cell is reduced due to its high standard reduction potential. Tin half-cells are oxidized.
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Answer: C
Explaination:
You are a scientist working on increasing the efficiency of appliances to waste less
electricity. You are running experiments measuring the input, output, and waste energy
from 3 light bulbs. Given the data below, determine which model has the lowest
percentage of energy lost as waste.
Lightbulb 1: 200 joules in, 50 joules wasted, 150 joules out
Lightbulb 2: 100 joules in, 30 joules wasted, 70 joules out
Lightbulb 3: 150 joules in, 100 joules wasted, 50 joules out
Lightbulb 1 has the lowest percentage of energy lost as waste : 25%
Further explanationGiven
The input, output, and waste energy of Lightbulb
Required
The lowest percentage of energy lost as waste.
Solution
Lightbulb 1 :
[tex]\tt \%energy~lost=\dfrac{50}{200}\times 100\%=25\%[/tex]
Lightbulb 2 :
[tex]\tt \%energy~lost=\dfrac{30}{100}\times 100\%=30\%[/tex]
Lightbulb 3:
[tex]\tt \%energy~lost=\dfrac{100}{150}\times 100\%=66.7\%[/tex]
Answer: lightbulb 1: 200 joules in, 50 joules wasted, 150 joules out
Explanation:
whats the molar mass of CO
Answer:
28.01
Explanation:
this is the molar mass
Liquid A has a density of 0.75 g/ m and liquid B has a density of 1.14 g/mL. What will happen when both liquids are poured into a container?
Submission Requirements
The final submission should include all of the section headings listed above and should follow the following format:
Part 1:
Allotrope definition:
Completed characteristics chart (You can copy/paste the chart into your final report)
Pictures of your three allotrope models (You should include at least one picture of each model and label the pictures).
Part 2:
History:
Compare and contrast the history of your three chosen allotropes. Answer all of the questions listed in this section. Be sure to discuss all three allotropes.
Uses:
Compare and contrast the current applications of your three chosen allotropes. Answer all of the questions listed in this section. Be sure to discuss all three allotropes.
Part 3
Future Applications:
Discuss the future uses of your chosen allotrope. Answer all of the questions listed in this section. Be thoughtful and specific in your discussion.
Impact on Society
Discuss your thoughts on how these future applications might affect society. Answer all the questions listed in this section. Be thoughtful and specific in your discussion
References:
State all the research sources used to create the models, complete the chart, and write the report. You should have a minimum of three reputable sources.
Answer: wut the are you asking for like an essay
Explanation:
2. How much energy must be removed from a 50.0 g sample of steam in order to get it to condense
into a liquid? (assume the steam is at 100 ℃)
Answer:
113 kJ or 113,000J
Explanation:
Since we are condensing it, a physical change in the state of matter is occurring. 113 kJ or 113,000J because of the following equation: Q = 2260 times 50. 2260 is the Heat of Vaporization constant.
The atom of an element S has a mass number of 88 and contains in its nucleus 12 neutrons more than protons. What is the electronic structure:
a) of the atom
b) The S2 + ion that it forms
Answer:
Explanation:
Mass number = No of neutrons + no of protons
Let no of protons be p , No of neutrons = p + 12
Putting the given values
88 = p + 12 + p
76 = 2p
p = 38
n = 50
a ) Atom is Strontium ( Sr )
Electronic configuration
1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶5s²
b ) Sr²⁺
1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶
1. Part A: Use the periodic table to order the following Period 3 elements from smallest to largest atomic radius: aluminum (Al), sulfur (S), and chlorine (Cl). Choose the appropriate order from the options below:
From the arrangement in the periodic table, the increasing order of the atomic radius is Chlorine < Sulfur < Aluminum.
The periodic table has been the arrangement of the elements with increasing atomic numbers and similarities. The elements comprising of the same valence electrons are arranged in the same group.
In the periodic table, on moving down the group there has been the atomic size has been increased with the increase in the shell on each period. The increase in the electrons in the same shell results in the increase in the attraction force and thus, the atomic size decreases across the period.
From the arrangement in the periodic table, the increasing order of the atomic radius is Chlorine < Sulfur < Aluminum.
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The reaction 2KBr(s) →+ Br2(l) + 2K(s) is a
Decomposition reaction
Answer: True
Explanation:
I'm not sure if this was the question.
a student conducts an experiment to test how the temperature affects the amount of sugar that cab dissolve in water. In the experiment, she uses 100 milliliters of water in each trial and stirs for five minutes each time.
What is the dependent variable?
a. the time stirred
b. the temperature of the water
c. the amount of water
d. the amount of sugar
Answer:
Answer: B) the temperature of the water
Explanation: The independent variable is the one that is manipulated or changed
how does the main function of the nervous system help the body react to internal and external stimuli??
How does a galvanic cell work? A. A voltage applied across two electrodes causes electrons to flow. B. A salt bridge connecting two electrodes generates electrons. O C. A redox reaction at two electrodes causes electrons to flow. D. Two electrolyte solutions react to cause electrons to flow.
Answer: C. A redox reaction at two electrodes causes electrons to flow
Explanation:
A galvanic cell work like a a redox reaction at two electrodes causes electrons to flow.
What is redox reaction?Redox reactions include a modification inside the oxidation state of the substrate. Losing of electrons or a rise in an element's oxidation state are both considered to be oxidation. Gaining electrons or lowering an object's or its atoms' oxidation state are both considered reductions.
What is galvanic cell ?An electrochemical cell wherein an electric current being produced spontaneously is called a galvanic cell as well as voltaic cell, respectively called just after scientists Luigi Galvani as well as Alessandro Volta. reduction-oxidation processes
In order to create a conduit for the passage of electrons through into the wire, each half-reaction in a galvanic cell is connected to the other by a wire, which allows the movement of electrons to be separated in the oxidation and reduction processes.
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Which element’s atoms have the greatest average number of neutrons?
Answer:
not sure but i guess it's Tellurium
what is the density of a block marble that occupies 255 cm^3 and has a mass of 1000g
Answer:
3.92 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question we have
[tex]density = \frac{1000}{255} \\ = 3.921568...[/tex]
We have the final answer as
3.92 g/cm³Hope this helps you
If an experiment involves a large volume of liquid a _______ would most likely be used to hold it.
a.
test tube
b.
graduated cylinder
c.
hot plate
d.
beaker
Please select the best answer from the choices provided
A
B
C
D
Answer:
D. beaker on edge
Explanation:
8. A wave has a frequency of 46 Hz and a wavelength of 2.1 meters. What is the speed of the wave?
Answer:
the speed of the wave is 96.6
Explanation:
to find do frequency x wavelength
Solve this problem using the appropriate law.
What is the volume of 0.382 moles of hydrogen gas at 1.50 atmospheres pressure and a temperature of 295 K? (R=0.0821 L - atm/mol
-K)
⚪︎ 6.17 L
⚪︎ 3.08 L
⚪︎ 4.01 L
⚪︎ 1.2 L
⚪︎ 0.23 L
Answer:
6.17 L
Explanation:
How many atoms should be present at the end of the reaction ?
4. What is the substance called that dissolves the other substance in a solution?
a. Soluto
b. Mixture
c. Solvent
d. Concentrator
Answer:
Solvent
Explanation:
When one substance dissolves into another, a solution is formed. A solution is a homogeneous mixture consisting of a solute dissolved into a solvent
how do i tell someone how i feel?
Larry uses a transformer to step down an incoming voltage. The transformer has ten loops in the primary coil and six in the secondary. If the incoming voltage is 120 volts, what is the outgoing voltage?
A. 720
B. 72
C. 200
D. 20
The outgoing voltage : 72 V
Further explanationGiven
Vp=primary=120 V
Np=10
Ns=6
Required
the secondary voltage
Solution
[tex]\tt \dfrac{V_p}{V_s}=\dfrac{N_p}{N_s}[/tex]
Input the value :
[tex]\tt \dfrac{120}{V_s}=\dfrac{10}{6}\\\\V_s=\dfrac{120\times 6}{10}=72~V[/tex]
What is the difference between a conductor and an insulator?
A) An insulator allows electricity to flow through it easily and a conductor does not
B) A conductor allows electricity to flow through it easily and an insulator does not.
C) An insulator is magnetic and a conductor is not
D) A conductor is magnetic and an insulator is not
Answer:
A conductor allows electricity or heat to flow through it easily and an insulator does not.
Explanation:
The difference between a conductor and an insulator is a conductor allows electricity to flow through it easily and an insulator does not.
What is conductor?A conductor is a material that conducts electricity. Most metals are good conductors. The best conductors are single element materials such as copper(Cu), silver(Ag), gold(Au), which are characterized by atoms with only one valence electron very loosely bound to the atom. What is an insulator?A material that does not easily transmit energy such as electric current or heat is called insulators. All materials contain electrons. The electrons in insulators like rubber are not free to move. They are tightly bound inside atoms.Hence, we can conclude that option B is the correct answer.
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What is different about the atomic structure of the carbon isotopes?
Answer:
Atoms of both isotopes of carbon contain 6 protons. Atoms of carbon-12 have 6 neutrons, while atoms of carbon-14 contain 8 neutrons. A neutral atom would have the same number of protons and electrons, so a neutral atom of carbon-12 or carbon-14 would have 6 electrons.
Explanation:
what is the mass of
22.4 litres of ammonia
Answer:
17g
Explanation:
Using the relation :
Volume = mass / molar mass
Volume of ammonia = 22.4 litres
Mole of gas at stp :
1 M of NH3 = 22.4 litres
Chemical formula for ammonia = NH3
The molar mass :
NH3 =14 + (1*3) = 14 + 3 = 17
Volume of ammonia = 1 M
Mass = volume * molar mass
Mass = 1 * 17
Mass = 17g
What is the total pressure in units of kPa in a 7.85 L container that contains 4.45 moles of N2 and 2.45 moles of O2 at a temperature of 307 K?
Answer:
Total pressure = 22.15 atm
Explanation:
Given data:
Total pressure = ?
Volume of container = 7.85 L
Number of moles of N₂ = 4.45 mol
Number of moles of O₂ = 2.45 mol
Temperature = 307 K
Solution:
Pressure of N₂:
PV = nRT
P = nRT/V
P = 4.45 mol ×0.0821 atm.L/mol.K ×307K / 7.85L
P = 112.16 atm.L/7.85 L
P = 14.28 atm
Pressure of O₂:
PV = nRT
P = nRT/V
P = 2.45 mol ×0.0821 atm.L/mol.K ×307K / 7.85L
P = 61.75 atm.L/7.85 L
P = 7.87 atm
Total pressure = P(N₂) + P(O₂)
Total pressure = P( 14.28 atm) + P( 7.87 atm)
Total pressure = 22.15 atm
AgF + Fe2(CO3)3 = FeF3 + Ag2CO3
Answer: Silver Fluoride + Ferric Carbonate = Ferric Fluoride + Silver Carbonate
Reaction Type
Double Displacement (Metathesis)
Reactants
Silver Fluoride - AgF
Argentous Fluoride Silver(I) Fluoride
Molar Mass of AgF Bond Polarity of AgF Oxidation State of AgF
Ferric Carbonate - Fe2(CO3)3
Molar Mass of C3Fe2O9 Oxidation State of C3Fe2O9
Products
Ferric Fluoride - FeF3
Molar Mass of F3Fe Oxidation State of F3Fe
Silver Carbonate - Ag2CO3
Silver(I) Carbonate
Molar Mass of CAg2O3 Oxidation State of CAg2O3
Explanation: did u understand that? if not pls contact me in the contacts ty
true or false/Air masses are responsible for the weather in a region
Answer:
False
Explanation:
The air masses are not responsible for weather , it is cause by the Earth evolution
Which of the following represents a type of change (physical or chemical) that is different from the rest?
a
Setting an inflated balloon on fire
b
Stretching a balloon before blowing air into it
c
Deflating a balloon by releasing all the air present in it
d
Twisting a long balloon to change its shape to form a flower
Answer:
a
Explanation: