Answer: 4.9 + 3.822 = 8.7
Explanation: Hope this helps
Answer: 8.722
Explanation:
1) List the number of each subatomic particle in the following atoms (1 point):
a) A nitrogen atom with a mass of 17 amu.
b) An atom of potassium with a mass of 45 amu.
c) An atom of iodine with a mass of 137 amu.
a. 7 protons, 7 electrons, 10 neutrons
b. 19 protons, 19 electrons, 26 neutrons
c. 53 protons, 53 electrons, 84 neutrons
Further explanationGiven
Atom and mass number
Required
The number of each subatomic particle
Solution
a. Nitrogen atom(atomic number = 7)
mass number = 17 amu
atomic number=number of protons=number of electrons(in neutral atom)
so number of protons=number of electrons = 7
mass number = protons+neutron
17 = 7 + neutrons
number of neutrons = 17-7=10
b. Potassium atom (atomic number = 19)
mass number = 45 amu
atomic number=number of protons=number of electrons(in neutral atom)
so number of protons=number of electrons = 19
mass number = protons+neutron
45 = 19 + neutrons
number of neutrons = 45-19=26
c. Iodine atom ((atomic number = 53)
mass number = 137 amu
atomic number=number of protons=number of electrons(in neutral atom)
so number of protons=number of electrons = 53
mass number = protons+neutron
137 = 53 + neutrons
number of neutrons = 137-53=84
In the chemical equation Fes - 2HCl → FeCl2 - H2S. there are two FeCl2 molecules
Please select the best answer from the choices provided
What is the answer?
Answer:Displacement reaction , as HCl displaces S of FeS to give H2S
Explanation:
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?
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
Which two changes would make this reaction favor the formation of products? 2502 +02= 2503 + energy A. Raising the temperature B. Decreasing the pressure O C. Decreasing the temperature D. Raising the pressure
C. Decreasing the temperature
D. Raising the pressure
Further explanationGiven
Reaction
2SO₂+O₂⇔2SO₃+energy
Required
Changes to the formation of products
Solution
The formation of SO₃ is an exothermic reaction (releases heat)
If the system temperature is raised, then the equilibrium reaction will reduce the temperature by shifting the reaction in the direction that requires heat (endotherms). Conversely, if the temperature is lowered, then the equilibrium shifts to a reaction that releases heat (exothermic)
While on the change in pressure, then the addition of pressure, the reaction will shift towards a smaller reaction coefficient
in the above reaction: the number of coefficients on the left is 3 (2 + 1) while the right is 2
As the temperature decreases, the equilibrium will shift towards the exothermic reaction, so the reaction shifts to the right towards SO₃( products-favored)
And increasing the pressure, then the reaction shifts to the right SO₃( products-favored)⇒the number of coefficients is greater
Answer:
C. Decreasing the temperature
D. Raising the pressure
Explanation:
A.P.E.X
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:
how does mechanical energy depend on other forms of energy??
Answer:
Other forms of energy can convert to mechanical energy
Explanation:
For example the electric or magnetic energy in a motor can convert to mechanical energy, or another example is when you put two magnets together they will clip together due to the magnetic energy that they have.
PLEAAAAAASE CAN SOMEONE JUST ANSWER THIS
—————————————->
The half life of Rn-222 is 3.8 days. If a basement holds 60 grams of Rn, how much will remain after 22.8 days?
Answer:0.9375, the second question is 1, the third question is 400, and the last is 3
Explanation: I just did the worksheet in my Chem class, and it was quite easy I didn't feel like going to all your questions and answering them so there ya go!
What are the half-reactions for a galvanic cell with Ni and Mg electrodes?
A. Ni(s) → Ni2+(aq) + 2e and Mg2+(aq) + 2e → Mg(s)
B. Ni2+(aq) + 2e → Ni(s) and Mg(s) – Mg2+(aq) + 2e
C. Ni(s) Ni2+(aq) + 2e and Mg(s) → Mg2+(aq) + 2e
D. Ni2+(aq) + 2e → Ni(s) and Mg2+ (aq) + 2e → Mg(s)
half-reactions
cathode(reduction) : Ni2+(aq) + 2e → Ni(s)
anode(oxidation) : Mg (s) → Mg²⁺ (aq) + 2e−
Further explanationGiven
Ni and Mg reaction
Required
the half-reactions
Solution
we determine which is the more reduced / oxidized of the two elements by looking at the voltaic series or the standard potential value
In voltaic series
Li-K-Ba-Ca-Na-Mg-Al-Mn- (H2O) -Zn-Cr-Fe-Cd-Co-Ni-Sn-Pb- (H) -Cu-Hg-Ag-Pt-Au
The more to the left, the metal is more reactive (easily release electrons) and the stronger reducing agent
The more to the right, the metal is less reactive (harder to release electrons) and the stronger oxidizing agent
If we look at the Mg metal located to the left of the Ni metal, so the Mg metal is more easily oxidized and can reduce the Ni metal which is on the right
Mg oxidation
Mg(s) – Mg2+(aq) + 2e
Ni reduction
Ni2+(aq) + 2e → Ni(s)
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
Which feature improves the safety of small modular reactors (SMRs)?
They use control rods to slow the reaction.
They can be installed underground.
They require less onsite preparation.
They produce less waste.
Answer:
They can be installed underground.
Explanation:
Keeps the reactor coolant water under high pressure to prevent it from boiling.
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.
To know more about galvanic cell
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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 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
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:
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]
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:
HELP!!!!!!!!!!! WILL GIVE EXTRA POINTS Using the five major types of chemical reactions listed below:
Combination or synthesis
Decomposition
Single replacement
Double replacement
Combustion
And using various resources from the internet, investigate how these reactions occur within the human body. Include the following information:
In what human body system does this reaction occur?
What is the purpose of this reaction in the human body?
What happens to the human body if this reaction does not occur or does not occur as it should?
Write the balanced equation for your reaction.
Include references for your research.
PLS ANSWERERRRRRR
F. SECTION A
G. SECTION D
H. SECTION C
J. SECTION B
Answer: F
Explanation: I did that test yesterday lol
Is CuO a acidic or basic oxide
and why
Answer:
CuO is a basic oxide and when it reacts with water it gives Cu(OH)2 which is a base as it gives Cu2+ and OH− ions when dissolved in water.
The atomic symbol represents the _____ of the element.
Protons
Explanation: the atomic number is the same as the number of protons
whats the molar mass of CO
Answer:
28.01
Explanation:
this is the molar mass
3. In an experiment it was found that 40.0cm of 0.2M sodium hydroxide solution just neutralized 0.2g
of a dibasic acid A. Calculate the relative molecular mass of acid A.
(2 marks)
The relative molecular mass of acid A : 50 g/mol
Further explanationGiven
40.0 cm³(40 ml) of 0.2M sodium hydroxide
0.2g of a dibasic acid
Required
the relative molecular mass of acid A
Solution
Titration formula
M₁V₁n₁=M₂V₂n₂
n=acid/base valence(number of H⁺/OH⁻)
NaOH ⇒ n = 1
Dibasic acid = diprotic acid (such as H₂SO₄)⇒ n = 2
mol = M x V
Input the value in the formula :(1 = NaOH, 2=dibasic acid)
0.2 x 40 x 1 = M₂ x V₂ x 2
M₂ x V₂ = 4 mlmol = 4.10⁻³ mol ⇒ mol of Acid A
The relative molecular mass of acid A (M) :
[tex]\tt M_A=\dfrac{mass }{mol}=\dfrac{0.2~g}{4.10^{-3}}=50~g/mol[/tex]
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:
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
On a cold winter morning when the temperature is -13 C, the air pressure in an automobile is 1.5 atm. Using Gay Lussac's Law, what is the pressure after the tire has warmed to 15 degrees C?
Answer:
The correct answer is 1.66 atm ≅ 1.7 atm
Explanation:
Given:
T₁ = -13°C + 273 = 260 K (initial temperature)
T₂ = 15°C + 273 = 288 K (final temperature)
P₁ = 1.5 atm
P₂= ?
We use the mathematical expression of Gay Lussac's Law to calculate P₂, as follows:
P₁/T₁ = P₂/T₂
P₂= P₁/T₁ x T₂ = (1.5 atm)/(260 K) x 288 K = 1.66 atm ≅ 1.7 atm
Since the law says that the temperature of a gas is directly proportional to the pressure, when the temperature is increased, the pressure increases.
how does the main function of the nervous system help the body react to internal and external stimuli??
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:
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: