Answer:
Explanation:
Mint produced more than 130 billion pennies. Then, in 1982 the Mint introduced a penny that is 97.6 percent zinc and only 2.4 percent copper with a density of 7.2 g/mL. By comparison, the old pre-1982 copper pennies were 95 percent copper and 5 percent zinc with a density of 8.8 g/mL.
A carbon monoxide molecule contains a _______.
A. Metallic Bond
B. Covalent Bond
C. Semisonic Bond
Answer:
B
Explanation:
What is the fluoride ion concentration for a saturated solution of BaF 2 if the K sp for BaF 2 is 1.8 × 10 -7 ?
[tex]\\ \rm\rightarrowtail BaF_2\longrightarrow Ba^{2+}+2F-[/tex]
BaF_2 be xBa2+ is also xF- is 2xNow
[tex]\\ \rm\Rrightarrow K_{sp}=[Ba^2+][F-]^2[/tex]
[tex]\\ \rm\Rrightarrow 1.8\times 10^{-7}=x(2x)^2[/tex]
[tex]\\ \rm\Rrightarrow 4x^3=1.8\times 10^{-7}[/tex]
[tex]\\ \rm\Rrightarrow x^3=0.45\times 10^{-7}[/tex]
[tex]\\ \rm\Rrightarrow x=\sqrt[3]{0.000000045}[/tex]
[tex]\\ \rm\Rrightarrow x=0.00376M[/tex]
[tex]\\ \rm\Rrightarrow x=3.8\times 10^{-3}M[/tex]
So
[tex]\\ \rm\Rrightarrow [F-]=2x=7.6\times 10^{-3}M[/tex]
How are the environments of a desert and a tundra different?
A tundra is at a higher latitude than a desert.
A tundra is less humid than a desert.
A tundra is much warmer than a desert.
A tundra receives less precipitation than a desert.
Answer:
A tundra is less humid than a desert
Explanation:
Does q for the formation of 1 mol of no from its elements differ from q for the decomposition of 1 mol of no to its elements and what is the relationship between the two qs?.
Answer:
Yes, the Qs for the two reactions are reciprocal.
Explanation:
No, the Qs are the same.
What are decomposition and examples?Decomposition reactions are processes in which chemical species break up into simpler parts. Usually, decomposition reactions require energy input. For example, a common method of producing oxygen gas in the laboratory is the decomposition of potassium chlorate (KClO3) by heat.
How do elements decompose?When bonds in a single chemical compound are broken, it results in it breaking apart to form two or more products. When this happens, it is known as chemical decomposition and it takes place as a chemical reaction.
Learn more about decomposition here: brainly.com/question/27300160
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3. Use the chemical equation to answer the question.
2Ag(s) + H2S(g) → Ag2S(s) + H2(g)
The molar mass of silver (Ag) is 108 g/mol. The molar mass of sulfur (S) is 32 g/mol. The reaction uses 0.04 mol of silver. Which steps show how to determine the mass of silver sulfide (Ag2S) produced in the reaction?
A 2(108 g/mol)+32 g/mol=248 g/mol2(108 g/mol)+32 g/mol=248 g/mol; (248 g/mol)(0.02 mol)=4.96 g(248 g/mol)(0.02 mol)=4.96 g
B 108 g/mol+2(32 g/mol)=172 g/mol108 g/mol+2(32 g/mol)=172 g/mol; (172 g/mol)(0.04 mol)=6.88 g(172 g/mol)(0.04 mol)=6.88 g
C 108 g/mol+2(32 g/mol)=172 g/mol108 g/mol+2(32 g/mol)=172 g/mol; (172 g/mol)(0.02 mol)=3.44 g(172 g/mol)(0.02 mol)=3.44 g
D 2(108 g/mol)+32 g/mol=248 g/mol2(108 g/mol)+32 g/mol=248 g/mol; (248 g/mol)(0.04 mol)=9.92 g
The mass of silver sulfide that would be produced will be 4.96 g and the correct step would be option A.
Stoichiometric equationFirst, get the balanced equation of the reaction:
2Ag(s) + H2S(g) → Ag2S(s) + H2(g)
The mole ratio of Ag and Ag2S is 2:1
For 0.04 mole Ag, the equivalent mole of Ag2S would be: 0.04/2 = 0.02 moles.
Mass of 0.02 mole Ag2S = mole x molar mass
Molar mass of Ag2S = 108x2 + 32 = 248
Mass of Ag2S = 0.02 x 248 = 4.96 g
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A sample of 35.1 g of methane has a volume of 5.20 L at a pressure of 2.70 atm. Calculate the temperature.
Answer:
4.78 K
Explanation:
What do scientists call the type of rocket in which part of the rocket is dropped off after fuel has been used?
A. multistage rocket
B. segmented rocket
C. break away rocket
D. high velocity rocket
Answer:
Multistage rockets
Explanation:
Multistage is a launch vehicle that uses two or more rocket stages, each of which contains its own engines and propellant.
1) Convert 1.85mol to molecules (1.11x1024)
Answer:
1.11×10²⁴
Explanation:
To convert mol to molecules
Multiply the number of moles to 6.02×10²³
1.85×6.02×10²³ = 1.11×10²⁴
Write the IUPAC nomenclature for the following a. Al2 (CO3)3
Answer:
Aluminum carbonate | Al2(CO3)3 - PubChem
Explanation:
mark me brainliest!!
What are the four factors that can affect reaction rate?
1. temperature
2. particle size
3. ??
4. ???
Brainliest if you finish this:
FREDDY! YOU'RE SUPPOSED TO BE ON LOCKDOWN!!!
Answer:
presence of catalyst.
reactant concentration.
Answer:
temperature
Freddy: don't care didn't ask plus your white. lol its one of them (:≡
Explanation:
How many bases are needed to specify three amino acids.
PLEASE HELP ME NOW! WHATS NEWTONS FIRST LAW?!!!
Answer:
Newton's first law states that if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.
Explanation:
Hope this helps!
1. How many ATONS of oxygen are present in 8.18 grams of dioxygen difluoride ?
atoms of oxygen.
what are the limitations of Doppler effect?
Answer: Limitations of the Doppler Effect include,
The Doppler effect is applicable when the velocities of the source of sound and observer are much less than the velocity of sound.The motion of both the observer and the source is along the same straight line.Hope this helps!
Answer:
Velocity of source of sound must be less than that of the Velocity of sound
Explanation:
learned it from science
Mercury(II) oxide (HgO) decomposes to form mercury (Hg) and oxygen (O2). The balanced chemical equation is shown below. 2HgO Right arrow. 2Hg O2 The molar mass of O2 is 32. 00 g/mol. How many moles of HgO are needed to produce 250. 0 g of O2? 3. 906 moles 7. 813 moles 15. 63 moles 73. 87 moles.
15.63 moles of HgO are needed to produce 250. 0 grams of Oxygen.
How we calculate moles from masses?Moles of any substance can be calculated as:
n =W/M, where
W = given mass
M = molar mass
Given chemical reaction is:
2HgO → 2Hg + O₂
From the stoichiometry of the reaction, it is clear that:
2 mole of HgO = produce 1 mole of O₂
Given mass of O₂ = 250 grams
Molar mass of O₂ = 32 g/mole
Mole of produced O₂ = 250g / 32g/mole = 7.81 moles
Now, 7.81 moles of O₂ = produced by 2×7.81 = 15.63 moles of HgO
Hence, option (3) is correct i.e. 15.63 moles is the required moles.
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Weather balloons carry instruments that can gather data about Earth’s atmosphere. On the ground, a weather balloon has a volume of 250. L, a pressure of 755 mmHg, and a temperature of 25.0°C. As the balloon ascends into the atmosphere, the temperature decreases to 22.0°C and the pressure changes to 710. mmHg. What is the new volume of the weather balloon? Type in your answer using the correct number of significant figures. L
Answer:
The answer is 263 L
Explanation:
I just did it on edu, and if you want the answer before this is 0.95 atm
Your welcome!
What do we have to have to be able to determine the number of neutrons?
A. average atomic mass
B. mass number
Answer:
Answer is A :)
Explanation:
Answer:
B. Mass number
Explanation:
In order to gain the number of neutrons you need to subtract the Protons from the atomic mass (also known as the mass number or nucleon number.
For example :
Carbon - protons= 6
Nucleons=12
Therefore carbons neutrons = 6
A gas has a volume of 87.5 L and 8.7 moles. if the amount of moles is increased to 18, what is the volume?
Answer:
V2 = 181
Explanation:
Follow this equation: V1/n1 = V2/n2
V1 = 87.5L
n1 = 8.7
n2 = 18
V2 =?
V1/n1 = V2/n2 (to find V2, switch n2 to the other side)
So it going to be ---> n2×V1/n1 = V2
18×87.5/8.7 = V2
1575/8.7 = V2
181 = V2
So the answer is: 181
What kind of a system is a coffee held in a cup??
don't spam..
Explanation:
Hope it helps you!!Answer:
open system
Explanation:
Coffee held in a cup is an open system because it can exchange matter water vapors and energy heat with the surroundings.
Consider this reaction: NH4 HPO42− → NH3 H2PO4− Which is the Bronsted-Lowry acid ? NH4 HPO42- HPO42– H2PO4–.
Bronsted - Lowry acid in the given reaction is NH₄, as it gives H⁺ ion.
What is Bronsted - Lowry acid?According to the theory of Bronsted - Lowry, acids are those substances which gives H⁺ ion or proton in the aqueous medium.
Given chemical reaction is :
NH₄ + HPO₄²⁻ → NH₃ + H₂PO₄⁻
In the above reaction NH₄ is the Bronsted - Lowry acid as it gives H⁺ ion in the reaction and changes to NH₃ which is the conjugate base of NH₄. Whereas HPO₄²⁻ is the Bronsted - Lowry base as it accepts the H⁺ ion to form H₂PO₄⁻ which is the conjugate acid of it.
Hence, option (1) is correct, i.e. NH₄ is the Bronsted - Lowry acid.
To know more about Bronsted - Lowry acid, visit the below link:
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Answer:
NH₄
correct on ed 2022
What are these two processes called?
Plants consume
carbon dioxide and
release oxygen.
Animals consume
Oxygen and release
carbon dioxide.
Answer:
Plants consume carbon dioxide and release oxygen.
Answer: Photosynthesis
Animals consume oxygen and release carbon dioxide.
Answer: Respiration
A 2.0 mol sample of CO(g) and a 2.0 mol sample of H2O(g) are introduced into a previously evacuated 100. L rigid container, and the temperature is held constant as the reaction represented above reaches equilibrium.
CO(g) + H2O (g) CO2(g) + H2(g) Kc = 1.5 x 10^3
Which of the following is true at equilibrium?
For the chemical reaction CO(g) + H2O (g) >>CO2(g) + H2(g) at Kc = 1.5 x 10^3 the solve to discover
CO2= 1.94>>CO= 0.06 is True about the reaction
What is true about the reaction?
Generally, the equation for the Chemical Reaction is mathematically given as
CO(g) + H2O (g) >>>CO2(g) + H2(g)
Therefore
Kc = x .x / ( 2 - x ).(2 - x)
Kc= 1.5 x 103
Kc= x2 / (2-x)2
Where
Kc = 1.5 x 103
x=1.94
In conclusion,
[CO] = [H2O]
CO= 2 - 1.94
CO= 0.06
[CO2] = [H2]
CO2= x
CO2= 1.94
Read more about Chemical Reaction
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Are the number of neutrons equal to the atomic number?
What problems do you think you can solve using science
Answer:
you can solve the problem of growing a plant and it not germinating or possibly solve diseases.
Explanation:
Hope This Helps :)
Spectroscope, PLS help pls I'LL GIVE BRAINLIEST
Answer:
I don't know what the correct answer is
Explanation:
Nitrogen gas at 20. °C in a balloon has a volume of 3. 0 L and pressure of 1. 5 atm. If the temperature of the balloon is increased to 30. °C and the pressure to 2. 5 atm, what is the new volume of the balloon? Use the formula: P1V1 T1 = P2V2 T2 Temperature Conversion: °C 273 K.
Answer: 1.9L
Explanation: I got you
When an acidic molecule is added to water it will ____________ the pH of the solution because it increases the number of free __________ ions.
What is the volume of 1. 5 moles of oxygen gas at standard temperature and pressure (STP)? 22 L 34 L 58 L 71 L.
Volume is the quantity of area occupied by any substance in a system and is measured in litres. The volume of oxygen at STP will be 34 L.
What is STP?STP is the standard temperature and pressure of the substance that is used for the calculation of the gases for the comparison.
The moles of oxygen given is 1.5 moles and as we know that 1 mole of gas at STP has 22.4 L of volume then the volume of 1.5 moles containing oxygen will be,
[tex]1.5 \times 22.4 = 33.6 \;\rm L[/tex]
Therefore, option B. 34 L is the volume of 1.5 moles of oxygen at STP.
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Why is it more comfortable to exercise on a day when the relative humidity is low?
Sweat evaporates quickly at low relative humidity, the amount of water vapor in the atmosphere, so it makes the body feel cooler. If the humidity is high that means there is a lot of water vapor in the air and thus the sweat cannot evaporate and forms pools on our skin making us feel uncomfortable.
Hope that helps!
1) according to the kinetic molecular theory of gases, a gas can be compressed much more than a liquid or solid because gas particles do not attract or repel one another b) the particles of a gas are very far apart. c) gas particles move faster when the temperature increases. d) gas particles move rapidly. in) a gas is composed of very small particles.
Answer:
option (b)
Explanation:
A gases can be compressed much more than a solid or liquid because the particles of a gas are very far apart