Answer:
In a formula unit of mg (OH)2, there are one magnesium ion and two hydroxide ions, or one magnesium, two oxygen, and two hydrogen atoms
Answer:
20 atoms
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
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:
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
Which element’s atoms have the greatest average number of neutrons?
Answer:
not sure but i guess it's Tellurium
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]
Describe the correct electron dot diagrams for the first ten elements of the periodic table.
Answer:
Describe the correct electron dot diagrams for the first ten elements of the periodic table. H and Li will each have one dot, He and Be will each have two dots, B will have three, C will have four, N will have five, O will have six, F will have seven, and Ne will have eight. Sulfur has 16 electrons in its atoms.
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:
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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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 reaction 2KBr(s) →+ Br2(l) + 2K(s) is a
Decomposition reaction
Answer: True
Explanation:
I'm not sure if this was the question.
PLEASE HELP
Which diagram represents a gas that has been ionized?
Answer: It would have to be Diagram 4
Explanation: That is the only one that looks Ionized and you can hook up a picture of an Ionized Diagram online. That can also help with this question.
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:
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
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
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:
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
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:
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
whats the molar mass of CO
Answer:
28.01
Explanation:
this is the molar mass
how do i tell someone how i feel?
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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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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How many atoms should be present at the end of the reaction ?
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?
how does the main function of the nervous system help the body react to internal and external stimuli??
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
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
What is the cathode of a galvanic cell made with magnesium and gold?
OA. Magnesium ions
O B. Gold ions
C. The magnesium electrode
D D. The gold electrode
Answer:
The cathode of a spontaneous electrochemical cell is the cell in which metal cations undergo reduction. The electrons are supplied by the anode. Without much thought, we can conclude magnesium is much less favorably reduced than gold.
The branch of science which deals with chemicals is called chemistry.
The correct option to the question is B.
The system in which the compound is breakdown into its ionic components is called a galvanic cell. In this cell there are two rods, These rodes are as follows:-
AnodeCathodeIn the given question, the cathode is the rode in which electrons enter into the galvanic cell. The cathode is defined as the negatively charged rode.
Hence, the correct option is B that is gold ions.
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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
What is the "octet rule?"
a.
The octet rule says that atoms are most stable when they have a full shell of electrons in the outermost shell
c.
The octet rule says that any atom can form a maximum of eight covalent bonds
b.
The octet rule states that the sum of all electrons in the lower subshells must equal eight
d.
None of the above
Answer:
A
Explanation:
The octet rule refers to the tendency of atoms to prefer to have eight electrons in the valence shell. When atoms have fewer than eight electrons, they tend to react and form more stable compounds. When discussing the octet rule, we do not consider d or f electrons. Only the s and p electrons are involved in the octet rule, making it useful for the main group elements (elements not in the transition metal or inner-transition metal blocks); an octet in these atoms corresponds to an electron configurations ending with s2p6 .
Answer:
it's A
The octet rule is a chemical rule of thumb that reflects the theory that main group elements tend to bond in such a way that each atom has eight electrons in its valence shell, giving it the same electronic configuration as a noble gas.
The octet rule states that atoms tend to form compounds in ways that give them eight valence electrons and thus the electron configuration of a noble gas. An exception to an octet of electrons is in the case of the first noble gas, helium, which only has two valence electrons.
Explanation:
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