Answer:
In an uncharged atom, the number of protons is always equal to the number of electrons. Apr 24, 2017
Explanation:
Neutron: An uncharged particle found in the nucleus of an atom.
There is only one stable atom that does not have neutrons. It is an isotope of the element hydrogen called protium. Protium, which contains a single proton and a single electron, is the simplest atom.
[H] = 1.00 x 10^-7 M
a. Acidic
b. Basic
c. Neutral
240 g of water (specific heat = 4.186 J/g°C, initial temperature = 20°C) is mixed with an
unknown mass of iron (specific heat = 0.444 J/gºC, initial temperature 500°C). When
equilibrium is reached, the system has a temperature of 42°С. Find the mass of iron.
240 g of water (specific heat = 4.186 J/g°C, initial temperature = 20°C) is mixed with an unknown mass of iron (specific heat = 0.444 J/gºC, initial temperature 500°C). When equilibrium is reached,The answer for this would be 69.6
How do you find final temperature with specific heat?
You use q = mcΔT, but you assume aluminum = water and crack for This the final temperature.
We need to look up heat values (c) for aluminum and h20. This will uses 0.901 for aluminum and 4.18 use water
: (10)(130 - T)(0.901) = (200.0)(T - 25 (6)
Hence, The answer for this would be 69.6.
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PLSSS HELP ME THIS IS FOR SIENCE PLLLLSSSSS
The passing of heat through a material is called ________.
A. vibration
B. conduction
C. radiation
D. convection
Answer:
Conduction
Explanation:
I took the course
Answer:
B. conduction
18. If I need to dilute a 12 M hydrochloric acid solution and make 300 mL of a 0.100 solution, how
much of the 12 M hydrochloric acid do I need?
Explanation:
A 300-ml of 0.100M HCl solution contains
0.100M HCl = (0.100 mol HCl/L) × (0.300 L)
----> 0.03 mol HCl
So we need to find the volume of 12M HCl solution that contains 0.03 mol HCl
0.03 mol HCL = (12 mol HCl/1 L)×V
or
V = (1 L × 0.03 mol HCl)/(12 mol HCl)
= 0.0025 L
= 2.5 ml
So you need 2.5 ml of 12M HCl to be diluted with distilled water to 300 ml in order to get a 0.100M HCl solution.
Products will form faster if___
A) temperature is decreased
B) the reaction is not stirred
C) the particle size of the reactants are larger
D) concentration of the reactants are increased
Answer:
C(btw this could be wrong)
Explanation:
Answer:
B is the answer
Explanation:
half equation for oxygen to oxide ions, aluminium ions to aluminium, magnesium to magnesium ions
someone help me with this please, it’s overdue:(
Answer:
See explanation.
Explanation:
Hello there!
3. In this case, according to the given question, it turns out possible for us to say that any chemical formula, for an ionic compound, has the cation (positive) on the left and the anion (negative) on the right; thus, since Mg is a metal, which tends to lose electrons and become positively charged whereas the Cl is a nonmetal, which tends to gain electrons and become negatively charged, we have the following:
[tex]Mg^{2+}Cl^-\\\\Mg^{2+}Cl^-_2\\\\MgCl_2[/tex]
4. In this case, since lithium is a metal, as well as magnesium, it is not possible for them to switch around their charges as they will not be bonded because they will be repelled rather than attracted because of their equal positive charges.
Regards!
If the acid dissociation constant, Ka, for an acid HA is 8 x 104 at 25°C, what percent of the acid is dissociated
in a 0.50 M solution of HA at 25°C?
A
08%
Answer:
Percent dissociated = 3.92%
Explanation:
The equilibrium of the weak acid, HA, is:
HA ⇄ H⁺ + A⁻
Where Ka = 8x10⁻⁴ is: [H⁺] [A⁻] / [HA]
As both H⁺ and A⁻ comes from the same equilibrium we can write the concentrations of the species as follows:
[H⁺] = X
[A⁻] = X
[HA] = 0.50M - X
Where X is reaction coordinate
Replacing:
8x10⁻⁴ = X² / 0.50-X
4x10⁻⁴ - 8x10⁻⁴X - X² = 0
Solving for X:
X = -0.02M. False solution. There is no negative concentrations
X = 0.0196M. Right solution.
Replacing:
[A⁻] = 0.0196M
Percent of the acid that is dissociated is:
[A⁻] / [HA]₀ * 100
[HA]₀ is its initial concentration = 0.50M
0.0196M / 0.50M * 100
Percent dissociated = 3.92%In which type of reaction does a reactant compound break down in order to form
two or more compounds or elements in the product?
a. Synthesis
b. Decomposition
c. Combustion
d. Single Displacement
Answer:
decomposition is the answer it helped also explanation of it is below this answer
Explanation:
In a decomposition reaction, one reactant breaks down into two or more products. This is the reverse of a synthesis reaction. Replacement reactions occur when elements switch places in compounds
to the nearest gram, what is the mass of of one spoonfull of sugar? g
Answer:
the mass of one spoonful of sugar to nearest gram is 10g
Draw the major organic product(s) of the reaction of p-bromoaniline with HNO2, HCl.
Answer:
The major product from this reaction is 4-bromobenzene diazonium chloride.
Explanation:
The reaction of p-bromoaniline with HNO2 and HCl produces diazonium salt. When primary aromatic amines are nitrosated with nitrous acid in the presence of a strong acid such as HCl, diazonium salts are frequently formed. The diazonium salts are a crucial step in the production of halides and azo compounds. The necessary reaction mechanism is depicted in the illustration in the diagram below.
Helpppooo give answer thanks
Answer:
625 mL
Explanation:
From the question given above, the following data were obtained:
Volume of stock solution (V₁) = 250 mL
Molarity of stock solution (M₁) = 5 M
Molarity of diluted solution (M₂) = 2 M
Volume of diluted solution (V₂) =?
The volume of the diluted solution can be obtained by using the dilution formula as illustrated below:
M₁V₁ = M₂V₂
5 × 250 = 2 × V₂
1250 = 2 × V₂
Divide both side by 2
V₂ = 1250 / 2
V₂ = 625 mL
Therefore, the volume of the diluted solution is 625 mL.
Which of the following are reasons the ocean marine biomes are a challenging place for organisms to live? Choose all that apply.
Question 13 options:
some areas are extremely dark and deep
high waves can be rough and powerful
all of the organisms have to live without sunlight
organisms have to be able to live in extremely salty conditions
In an ecosystem, the reason that ocean marine biomes are a challenging place for organisms to live because they have to be able to live in extremely salty conditions.
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
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Why when you get out of the pool, the cement pavement is hot compared to the pool water?
Answer: Water is a much better conductor of heat than air. So when you are surrounded by water, energy can flow from your body (conduction of heat) much more quickly than it would if you were surrounded by air at the same temperature.
What is the Molar mass of zinc
Answer:
65.38 u
Explanation:
hope this helps you out!!!!!!!
They Mean D and not U H just took the test and its D i hope this help
If a 50.0 g piece of glass is heated from 20.0°C to 40.0°C, how many joules of heat are added? The specific heat of glass is 0.50 J/g°C.
Answer:
500J (joules)
Explanation:
since heat is is the product of mass, change in temperature, and specific heat, the solution can be found from the equation q = mcΔt, heat is 50 * .5 * 20 = 500J
How is water important to many branches of science?
Answer:
Water is capable of dissolving a variety of different substances, which is why it is such a good solvent. And, water is called the "universal solvent" because it dissolves more substances than any other liquid. This is important to every living thing on earth.
Which
gas is exchanged in the air sac of
longs? -
oxygen and nitrogen
oxygen and carbondioxide
O nitrogen and coarbondioxide
oxygen and hydrogen
O
Other:
Answer:
oxygen and carbon dioxide.
hope this helps you
Which is/are used in nuclear reactors to absorb neutrons?
A. heavy nuclei
B. critical mass
C. chain reactions
D. control rods
Answer:
A. heavy nuclei
Explanation:
They absorb neuyrons in order to hain stability.
A mixture of fuel and is injected into a cylinder fitted with a piston. The initial volume is 0.37 L. After the mixture is ignited, gaseous products are formed and 1885 J of energy is released by the reaction. 311 J of the released energy is lost as heat to the surroundings. To what volume would the gases expand against a constant pressure of 1.036 atm, if the remainig energy is converted to work to push the
Answer:
The gases will expand to a volume of 2.37 L
Explanation:
Gases are able to do work when they expand or compress against an external constant pressure.
This work done by gases when they expand or compress against a constant external pressure is known as pressure-volume work or PV work.
The formula for calculating the work done by gases when they compress or expand against a constant pressure is given as W = PΔV
Where ΔV is change in volume given as V2 - V1
Where V2 is final volume, V1 is initial volume
By convention, W can either be negative or positive. When work is done by the system (ΔV > 0), W is negative and when work is done on the system (ΔV < 0), W is positive.
In the gas mixture above, W = PΔV
Remaining energy, W = (1885 - 311) J = 1574 J
P = 1.036 atm = 1.036 × 760 mmHg = 787.36 mmHg
ΔV = V2 - V1
ΔV = V2 - 0.37
1574 = 1.036 (V2 - 0.37)
V2 - 0.37 = 1574/787.36
V2 - 0.37 = 1.999 L
V2 = 1.999 + 0.37
V2 = 2.369 L
Therefore, the gases will expand to a volume of 2.37 L
Which example is the site of oxidation when the dry cell is operating?
solid zinc layer
cardboard separator
graphite rod
paste
A dry cell is one type of electric battery which is generally used for the home and portable electronic devices. A battery is a device which consists of one or more electrochemical cells. The site of oxidation occurs in solid zinc layer. The correct option is A.
What is a dry cell?A dry cell is defined as an electrochemical cell which consists of low moisture immobilized electrolytes in the form of a paste which restricts it from flowing. It is developed by the German scientist Carl Gassner which converts chemical energy into electrical energy.
A dry cell consists of a metal container in which a low moisture electrolyte paste covers the graphite rod or a metal electrode. Generally, the metal container will be zinc whose base perform as the negative electrode (anode).
For a dry cell battery to operate, oxidation will occur from the zinc anode and reduction will take place in the cathode.
Thus the correct option is A.
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Ethyne or acetylene is also used in cutting torches. The acetylene is combined with pure oxygen producing a flame with a temperature of 6332 °F or 3500 °C. The combustion of acetylene in the presence of excess oxygen yields carbon dioxide and water:
2C2H2 (g) + 5O2 (g) --> 4CO2 (g) + 2H2O (l)
Calculate the value of ΔS° for this reaction.
A. +689.3 J/mol K
B. +432.4 J/mol K
C. -432.4 J/mol K
D. -122.3 J/mol K
The correct answer is
C. -432.4 J/mol K
Can you tell me any chemical reaction that occur due to kinetic energy
Answer:
The molecules in gasoline (octane, the chemical formula shown) contain chemical energy. This energy is transformed into kinetic energy that allows a car to race on a racetrack.
How many liters of phosphine are produced when 34 L of hydrogen reacts with an excess of phosphorus under STP?
Answer:
22.67 L of PH₃
Explanation:
The balanced equation is:
[tex]P_4 (s) + 6H_2(g) \to 4PH_3(g)[/tex]
From the equation:
[tex]34 L \times \dfrac{1 \ mol \ of H_2 }{22.4 \ L \ H_2} \times \dfrac{4 \ mol \ of \ PH_3}{6 \ mol \ H_2} \times \dfrac{22.4 \ L \ PH_3}{1 \ mol \ PH_3}[/tex]
= 22.67 L of PH₃
The candle is lit and dilute ethanoic acid is poured down the inside of the beaker. As the acid reacts with the baking soda, bubbles of CO2 gas form. After a few seconds
the air in the beaker is replaced by 0.20 liter of CO2 gas, causing candle flame to go out. The density of CO2 gas is 1.8 grams per liter at room temperature.
Choose the correct structural formula for the acid that was poured into the beaker.
Answer:
It’s answer #2
Explanation:
I only know this because i just got it wrong
The correct structural formula for the acid that is poured into the beaker is CH₃COOH.
What is acetic acid?Acetic acid is also called ethanoic acid. It is form as a byproduct of fermentation. It forms vinegar. Vinegar is 4 to 6% acetic acid with water.
It is widely used in homes as cleaning agent, in cooking, washing etc.
Thus, the correct option is 2, CH₃COOH.
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A solution at 25 degrees Celsius has a pH of 4.48. What is the pOH of this solution?
0.978
3.17
9.52
10.51
Answer:
The answer is C = 9.52
Explanation:
I took the test
The pOH of a solution that has a pH of 4.48 at 25°C is 9.52. Details about pH can be found below.
What is pH?pH refers to the power of hydrogen in a substance while the pOH refers to the power of hydroxyll ions. The pH of a solution ranges from 0 - 14 indicating the strength of acidity and alkalinity.
The relationship between the pH and pOH in a solution is given as follows:
pH + pOH = 14
According to this question, a solution at 25 degrees celsius has a pH of 4.48. The pOH of the solution is calculated as follows:
4.48 + pOH = 14
pOH = 14 - 4.48
pOH = 9.52
Therefore, the pOH of a solution that has a pH of 4.48 at 25°C is 9.52.
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Select the correct answer.
Your friend Keith has been in a dating relationship for six months. His personality has changed in these months. He looks unhappy and rarely smiles. He avoids the company of friends. On the rare occasions you have seen him, his face appears bruised. You suspect that Keith may be in an abusive relationship. What should you do in this case?
A.
avoid talking to Keith
B.
confront his dating partner
C.
encourage Keith to speak up and report abuse
D.
advise him to tolerate the abuse, as difficulties are a part of life
what is chemical name of ghee
Answer. Chemical formula of ghee: (C17H33 Coo)3 C3H5 • Chemical Reaction: (C17H31Coo)3 C3H5 + 3H2 (C17H33 Coo)3 C3H5
Why do some states have more representatives than other states? A Because states have different land areasBecause states have different land areas B Because states joined the U.S. in different yearsBecause states joined the U.S. in different years C Because all states have the same number of representativesBecause all states have the same number of representatives D Because states have different populationsBecause states have different populations
Answer:
D
Explanation:
The number of representatives depends on the population size. A state with fewer residents will have less representatives than a state with more residents.
What is (aq),(I), and (g) mean in H2O2(aq) -> H2O(l) + O2(g) and why is it nesesary to have (aq),(I), and (g)
Explanation:
A matter can be present in different states like solid, liquid or gas. When we write a chemical equation then states of species involved are also mentioned.
This is because it tells in what state the reactants were present and in what state the products are then formed.
For example, [tex]H_{2}O_{2}(aq) \rightarrow H_{2}O(l) + O_{2}(g)[/tex]
Now here, (aq) means aqueous, (l) means liquid and (g) means gas.
So, these states denoted are necessary as it tells that [tex]H_{2}O_{2}[/tex] in aqueous state dissociates to give [tex]H_{2}O[/tex] in liquid state and [tex]O_{2}[/tex] in gaseous state.