Answer:
Basic
Explanation:
The pH scale is measured from 0 to 14.
At the pH scale of 7, a solution is neutral.
Any solution above 7 is basic.
Any solution below 7 is acidic.
Because you have been given the hydronium concentration [H₃O⁺], you can find the pH of the solution using the following formula:
pH = -log[H₃O⁺]
pH = -log(6.0 x 10⁻¹²)
pH = 11.22
As you can see, the solution must be basic because the pH lies within the basic range.
How much heat is required to change 35.0 g of water from ice to liquid water?
The following information for water is given, but may or may not be useful:
C = 4.184 J/g°C
AHfus = 334 J/g
AHvap=2260J/g
Taking into account the definition of calorimetry and latent heat, 11,690 J is required to change 35 g of water from ice to liquid water.
Definition of calorimetryCalorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Definition of sensible heatSensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
Definition of latent heatLatent heat is defined as the energy required by a quantity of substance to change state.
When this change consists of changing from a solid to a liquid phase, it is called heat of fusion and when the change occurs from a liquid to a gaseous state, it is called heat of vaporization.
The heat Q that is necessary to provide for a mass m of a certain substance to change phase is equal to
Q = m×L
where L is called the latent heat of the substance and depends on the type of phase change.
Heat to change water from ice to liquid waterIn this case, you know:
Q= ?m= 35 gL= ΔHfus= 334 [tex]\frac{J}{g}[/tex] because the change consists of changing from a solid (ice) to a liquid phase (liquid water).Replacing in the definition of latent heat:
Q = 35 g× 334 [tex]\frac{J}{g}[/tex]
Solving:
Q= 11,690 J
Finally, 11,690 J is required to change 35 g of water from ice to liquid water.
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Differences between Minerals and ore minerals
Answer:
Minerals are naturally occurring inorganic solids with a crystalline structure and a definite range of chemical formula. Ores are concentrations of minerals in rock that are high enough to be economically extracted for use. All ores are minerals, but all minerals are not necessarily ores.
Hope its helpful!
Minerals are inorganic solids that develop in nature and have a crystalline structure as well as a specific spectrum of chemical formulas. Ores are areas of mineral concentration in rock that may be economically mined for use. Lodestone is one of the iron ores. The mineral known as ore is where metal is easily and affordably mined. The composition of ore is known. Minerals are naturally occurring metals that are found in the crust of the planet. Ores are minerals that can be utilized to profitably extract metal.
Complete combustion of a 17.12mg sample of xylene In oxygen yielded 56.77mg
Xylene moles =\frac{17.12}{106.16×1000}=0.00016moles=
106.16×1000
17.12
=0.00016moles
Moles of CO_2 =\frac{56.77}{44.01×1000}=0.0013CO
2
=
44.01×1000
56.77
=0.0013
Moles of H_2O= =\frac{14.53}{18.02×1000}=0.0008H
2
O==
18.02×1000
14.53
=0.0008
Moles ratios
\frac{0.0013}{0.0008}=1.625
0.0008
0.0013
=1.625
\frac{0.0008}{0.0008}=1
0.0008
0.0008
=1
Hence molecular fomula
The empirical formula is C 4H 5.
The molecular formula C8H10
Please help iggghghbvvv
A) Y because the line is flat, not going up or down. So, constant or no change in population
B) A positive correlation with introduction to animal A (because population is going up or increasing)
C)
1.New predator (due to Animal A eating them, meaning more of their predators are eating them)
2. Lack of food or food availability due to competition (from Animal A, e.g. if they eat the same food)
3. Introduction to a new disease (from Animal A)
Hope this helps!
Isotopes are:
A. found in the nuclear reactions in stars but not on Earth.
B. are only theoretical.
C. only formed in laboratories.
D. found in nature.
Hello and Good Morning/Afternoon
Let's consider all the choices to determine the attributes of isotopes
Choice (A) is wrong⇒ isotopes are often found in nature as they are often the atoms
that form the world around us
Choice (B) is wrong⇒ isotopes describe a certain type of atom with a certain
characterist that exists, thus it isn't theoretical
Choice (C) is wrong⇒ as said before, isotopes are found in nature and form the world
Choice (D) is correct⇒Isotopes are a type of atoms thus they are found in nature
Answer: (D)
Hope that helps!
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Answer:
D. found in nature.
Explanation:
Isotope is any of two or more forms of a chemical element, having the same number of protons in the nucleus, or the same atomic number, but having different numbers of neutrons in the nucleus, or different atomic weights. There are 275 isotopes of the the 81 stable elements, in addition to over 800 radioactive isotopes, and every element has known isotopic forms. Isotopes of a single element possess almost identical properties. An isotope of an element is just a version of that element with a particular number of neutrons. Some numbers are stable, some are not; the ones that aren't shoot particles out at extremely high speeds ("radiation").
Since radioisotopes generally have the same chemistry as their stable counterparts (since neutrons play almost no role in chemistry), they'll get wherever other atoms of that element would get. Iodine, for example, accumulates in your thyroid gland - so do radioactive forms of iodine, which can then cause thyroid cancer by irradiating it from the inside.
Also because they're chemically almost indistinguishable, they're almost impossible to separate out by any normal means. It's like giving someone a giant bin of golf balls, some of which are 1% heavier than the other golf balls but are otherwise exactly the same, and saying "okay, sort these". Except the golf balls are atoms and the bin is the size of a small country.
please explain:) I would really appreciate a step by step explanation if possible.
The enthalpy change of the reaction, ΔH = -311 kJ
Enthalpy change involved in the reaction of 300 g of CO = -10972.5 kJ
What is the enthalpy change for the reduction of ethyne to form ethane?
The enthalpy change for the reaction is obtained from the summation of the enthalpies of the reactions of the intermediate steps according to Hess's law.
The equation of the reaction is given below:
C₂H₂ + 2 H₂ → C₂H₆The enthalpy of the reaction, ΔH = ΔH₁ + 2ΔH₂ + (-ΔH₃)
ΔH = {(-1299) + (2 * -286) + (1560)}Kj
ΔH = -311 kJ
The equation for the methanation reaction is given below:
3 H₂O + CO → CH₄ + H₂O
The enthalpy for the methanation reaction is as follows:
ΔH = 1.5ΔH₁ + 0.5*(-ΔH₂) + ΔH₃ + -ΔH₄
ΔH = (-483.6 * 1.5) + (0.5 * 221.0) + (-802.7) + (393.5)
ΔH = -1024.1 kJ/mol
Molar mass of CO = 28 /mol
Enthalpy change involved in the reaction of 300 g of CO = 300/28 * -1024.1 kJ/mol
Enthalpy change involved in the reaction of 300 g of CO = -10972.5 kJ
In conclusion, the enthalpy changes are calculated from the enthalpy values of the intermediate reactions.
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What mass of carbon dioxide is produced from the complete combustion of 5.30x10-3 g of methane?
Express your answer with the appropriate units.
View Available Hints
Answer:
1.45 x 10⁻² g CO₂
Explanation:
To find the mass of carbon dioxide, you need to (1) convert grams CH₄ to moles CH₄ (via molar mass), then (2) convert moles CH₄ to moles CO₂ (via mole-to-mole ratio from reaction coefficients), and then (3) convert moles CO₂ to grams CO₂ (via molar mass). The final answer should have 3 sig figs to reflect the given value (5.30 x 10⁻³ g).
Molar Mass (CH₄): 12.011 g/mol + 4(1.008 g/mol)
Molar Mass (CH₄): 16.043 g/mol
Combustion of Methane:
1 CH₄ + 2 O₂ ---> 2 H₂O + 1 CO₂
Molar Mass (CO₂): 12.011 g/mol + 2(15.998 g/mol)
Molar Mass (CO₂): 44.007 g/mol
5.30 x 10⁻³ g CH₄ 1 mole 1 mole CO₂ 44.007 g
--------------------------- x ---------------- x --------------------- x ----------------- =
16.043 g 1 mole CH₄ 1 mole
= 0.0145 g CO₂
= 1.45 x 10⁻² g CO₂
Question 5
Which of the following molecules is carrying oxygen in circulating erythrocytes?
O Memeglobin
O Hemoglobin
O Stemoglobin
O Myoglobin
Question 6
O Hemoglobin
Explanation:
Hemoglobin (Heme + Globin) The protein hemoglobin is a molecule which is responsible for carrying almost all of the oxygen in the blood.
indicate whether fluorine of bromine has larger value
Bromine has larger ionic radius and atomic radius than fluorine.
Fluorine has larger ionisation energy and electronegativity than bromine.
What are halogen?Halogen are those elements that are found in group 7 of the periodic table.
Fluorine is in period two of the periodic table, meaning that it contains electrons in only the first two energy levels at ground state. It has a higher ionization energy and electronegativity than bromine.
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Indicate whether fluorine or bromine has a larger value for each of the following properties. a. electronegativity b. ionic radius c. atomic radius d. ionization energy
Why are carcinogens a concern to people?
Answer:
They have been found to cause cancer in humans meaning any release of carcinogens will increase, not decrease, CANCER RISK.
Explanation:
Certain chemicals, including benzene, beryllium, asbestos, vinyl chloride, and arsenic are known human carcinogens, meaning “they have been found to cause cancer in humans.” A persons risk of developing cancer depends on how much, how long, how often, and when they are exposed to these chemicals.
Think back to your three models of matter in parts A and B. Which model had a definite shape? Explain.
Answer:The first model (full container) represented matter that has a definite shape. The particles were packed tightly and did not have the freedom to rearrange themselves.
Explanation:
Two atoms interact with each other as shown by the equation. Complete the equation by filling in the missing parts.
The nuclear fission reaction with the formation of the deuterium has the missing part as ⁴₂He.
What is nuclear radiation?
Nuclear radiation is given as the reaction in which the emission is formed in the form of the nuclear particles that made the change in the nucleus of the atom.
The nuclear radiation that made the release of ₁¹H can be given to fuse the electron with the He and form:
²₁H + ³₂He →⁴₂He + ₁¹H
Thus, the missing part in the nuclear fission reaction is ⁴₂He.
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How many yards are in a 100 meter race ? How many feet?
Taking into account the change of units, 100 meters are 109.361 yards and 328.084 feets.
Rule of threeThe rule of three is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them.
That is, what is intended with it is to find the fourth term of a proportion knowing the other three.
If the relationship between the magnitudes is direct, that is, when one magnitude increases, so does the other (or when one magnitude decreases, so does the other) , the direct rule of three must be applied.
To solve a direct rule of three, the following formula must be followed, being a, b and c known data and x the variable to be calculated:
a ⇒ b
c ⇒ x
So: [tex]x=\frac{cxb}{a}[/tex]
The direct rule of three is the rule applied in this case where there is a change of units.
Distance in yards and feetTo perform in this case the conversion of units, you must first know that:
1 m= 1.09361 yards1 m= 3.28084 feetsThen, you can apply the following rules of three:
if 1.09361 yards is 1 meter, how many yards equals 100 meters?1 meter ⇒ 1.09361 yards
100 meters ⇒ x
So: [tex]x=\frac{100 metersx1.09361 yards}{1 meter}[/tex]
Solving:
x= 109.361 yards
if 3.28084 feets is 1 meter, how many yards equals 100 meters?1 meter ⇒ 3.28084 feets
100 meters ⇒ x
So: [tex]x=\frac{100 metersx3.28084 feets}{1 meter}[/tex]
Solving:
x= 328.084 feets
In summary, 100 meters are 109.361 yards and 328.084 feets.
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What products can be formed from P + H2O + I2
The products that can be formed are hydrogen iodide and phosphoric acid.
What are reaction products?They are substances formed from chemical reactions.
The equation of the illustrated reaction together with the products is as follows:
[tex]P + H_2O + I_2 --- > H_3PO_4 + HI[/tex]
The products formed are phosphoric acid ([tex]H_3PO_4[/tex]) and hydrogen iodide ([tex]HI[/tex].
Alternatively, the equation of the reaction can be written as:
[tex]18P + 5I_2 + 32H_2O -- > 10PH_4I + 8H_3PO_4[/tex]
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A compound has the formula X2Fe(CN)6 ∙ 12H2O, where X is an unknown element. [3]
If the compound is 45.34% water by mass, what is the identity of element X?
The element X from the calculation is Cs.
What is the identity of element X?We have in the question the percentage by mass of water as 45.34% thus we can write;
45.34% = 12(H20)/2(X) + Fe + 6(CN)
Hence;
45.34/100 = 12(18)/2X + 56 + 6(26)
0.45 = 216/2X + 56 + 156
0.45 = 216/2X + 212
0.45(2X + 212) = 216
0.9X + 95.4 = 216
X = 216 - 95.4/0.9
X = 134
The element X from the calculation is Cs.
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Compound found to contain 58.4% bromine. Which compound contains this % bromine by mass
Answer:
the compound is bromine trifluoride
Explanation:
it contains 58.37 as there is no compound with 58.4 bromine formula brf3
What is the change in temperature if 500 J of heat are added to a 23 g sample of silver? (Thespecific heat of silver is 0.24 J/g °C)
The change in temperature of silver if 500 J of heat are added to a 23 g sample of silver is 90.5°C.
How to calculate change in temperature?The change in temperature of a substance can be calculated using the following formula:
Q = mc∆T
Where;
Q = quantity of heat absorbed or releasedm = mass of substancec = specific heat capacity∆T = change in temperature500 = 23 × 0.24 × ∆T
500 = 5.52∆T
∆T = 500 ÷ 5.52
∆T = 90.5°C
Therefore, the change in temperature of silver if 500 J of heat are added to a 23 g sample of silver is 90.5°C.
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A tank car contains of acetone (density = 0.785 g/cm3). What is the volume of a full tank car, in m3, which contains 3.22 x 104 kg of acetone?
show the work please!
Taking into account the definition of density, the volume of a full tank car which contains 3.22×10⁴ kg of acetone is 41.02 m³.
Definition of densityDensity is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.
In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance.
Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
[tex]density=\frac{mass}{volume}[/tex]
From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.
Volume of a full tank carIn this case, you know that:
Density= 0.785 [tex]\frac{g}{cm^{3} }[/tex]mass= 3.22×10⁴ kg= 32,200,000 g (being 1 kg= 1000 g)Volume= ?Replacing in the definition of density:
[tex]0.785 \frac{g}{cm^{3} }=\frac{32,200,000 g}{volume}[/tex]
Solving:
volume×0.785[tex]\frac{g}{cm^{3} }[/tex]= 32,200,000 g
volume=[tex]\frac{32,200,000 g}{0.785 \frac{g}{cm^{3} }}[/tex]
volume= 41,019,108.28 cm³= 41.01910828 m³≅ 41.02 m³ (being 1 m³ = 1000000 cm³)
In summary, the volume of a full tank car which contains 3.22×10⁴ kg of acetone is 41.02 m³.
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What is the freezing point depression of an aqueous solution of 10.0g of glucose (C6H12O6) in 50.0g of water? [Kf for a water= 1.86°c/m, C=12, O= 16, H=1]
The freezing point depression is 2.1 °c.
What is freezing point?The freezing point is the point that a liquid is converted to solid. Now we know that the freezing point is a colligative property.
Number of moles of glucose = 10.0g /180 g/mol =0.056 moles
Mass of water = 50.0g or 0.05 Kg
Molality of the solute = 0.056 moles/ 0.05 Kg = 1.12 m
The freezing point depression is obtained from;
ΔT = K m i
ΔT = 1.86°c/m * 1.12 m * 1
ΔT = 2.1 °c
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What is the partial pressure (in mmHg) of oxygen in a sample of sea level air (a mixture
of oxygen, nitrogen, water vapor, carbon dioxide and other things) given the following
information?
P(N₂) = 0.72 atm P(H₂O) = 7.7 torr P(CO₂) = 0.37 mmHg P(other) = 0.97 kPa
The partial pressure of oxygen, P(O₂) is 198.83 mmHg.
What is partial pressure of a gas?The partial pressure of a gas is the pressure gas will exert in a mixture of gases which do not react chemically together.
The sum of partial pressure of gases at atmospheric pressure = 760 mmHg
P(N₂) + P(H₂O) + P(CO₂) + P(O₂) + P(other) = 760 mmHg
P(N₂) = 0.72 atm = 547.2 mmHg
P(H₂O) = 7.7 torr = 7.7 mmHg
P(CO₂) = 0.37 mmHg
P(other) = 0.97 kPa = 5.9 mmHg
P(O₂) = 760 - (547.2 + 7.7 + 0.37 + 5.9) = 198.83 mmHg
Therefore, the partial pressure of oxygen, P(O₂) is 198.83 mmHg.
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what is the balanced hydration equation for Silicon phosphate
The balanced hydration equation for Silicon phosphate is as follows: Si3(PO4)4 + 6H2O → 3SiO2 + 4H3PO4.
What is hydration?Hydration is the incorporation of water molecules into a complex with those of another compound.
According to this question, silicon phosphate with a chemical formula of Si3(PO4)4 is hydrated to produce silicon oxide and phosphoric acid as follows:
Si3(PO4)4 + H2O → SiO2 + H3PO4.
However, this equation is not balanced as the number of moles of each element on both sides is not the same. The balanced equation is as follows:
Si3(PO4)4 + 6H2O → 3SiO2 + 4H3PO4
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According to the following reaction, how many moles of oxygen gas are necessary to form 0.408 moles carbon dioxide?
C3 Hs (g) +502(g) → 3CO2(g) + 4H₂O(g)
mol oxygen gas
Answer:
2 molecules of oxygen are necessary
calc mL of radiator solution when 197 mL antifreeze is used to make a 25% (v/v) solution
The volume of the radiator solution formed with the 197 mL of antifreeze is 788 mL.
What is a percentage?A percentage is given as the respective ratio of the quantity present with respect to others.
The solution of 25% v/v can be depicting the presence of a 25% volume of antifreeze in the radiator solution.
The volume of the radiator solution has 197 mL of antifreeze. The total volume of the solution suppose is x.
25% of x = 197 mL
25/100 * x = 197
x = 788 mL
The volume of the radiator solution formed with 25% v/v antifreeze is 788 mL.
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When preparing a pure and dry sample of ammonium chloride, we cannot dry the sample of ammonium chloride by evaporating it to dryness.
we cant
Explanation:
you need to leave some water to stop dehydration of substance
When preparing a pure and dry sample of ammonium chloride, we cannot dry the sample by evaporating it to dryness because ammonium chloride is a salt that decomposes upon heating.
When heated, ammonium chloride undergoes sublimation, which means it directly changes from a solid to a gas without passing through a liquid phase. This process would lead to the loss of the compound, and we would not be able to obtain a pure and dry sample.
Instead, other methods such as vacuum drying or desiccation are used to remove moisture from ammonium chloride without causing decomposition.
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Electrons are always shared evenly during covalent bonding.
O True
False
Answer:
False
Explanation:
There are two types of covalent bonding: polar covalent boding and nonpolar covalent bonding. During polar covalent bonding, the electrons are not shared evenly. This is due to the electronegativity differences between the two atoms. During nonpolar covalent bonding, the electrons are shared evenly.
Draw a heating curve for 1 mole of methanol beginning at 170K and ending at 350K. Assume that the values given here are constant over the relevant temperature ranges.
The graph of the heating of methanol has been attached.
The temperature at 170 K is approximately the melting point of methanol.
The temperature at 350 K is approximately the boiling point of methanol.
If we provide heat before 170 K temperature then all the heat provided to the methanol will result in rise in temperature of methanol in solid form.
If we provide heat at 170 K temperature then all the heat provided to the methanol will result in change in physical from of methanol from solid to liquid.
If we provide heat after 170 K temperature and before 350 K temperature then all the heat provided to the methanol will result in rise in temperature of methanol in liquid form.
If we provide heat at 340 K temperature then all the heat provided to the methanol will result in change in physical from of methanol from liquid to gas.
If we provide heat after 350 K temperature then all the heat provided to the methanol will result in rise in temperature of methanol in gas form.
So, the heat given to methanol will rise its temperature except at its Boiling and melting point. At those temperature heat will change the physical form of methanol first. and the graph also have been attached of between boiling point and melting point as given in question .
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When most fuels burn, water and carbon dioxide are the two main products. however, water and carbon dioxide are not the products of all combustion reactions. which will not form water and carbon dioxide when it burns?
Incomplete combustion does not form water and carbon dioxide when it burns.
There are two types of combustion:-1) Complete combustion:-A fuel receives enough oxygen to complete combustion when it burns in a lot of air.
Fuels like gasoline and natural gas contain hydrocarbons. These are only hydrogen and carbon compounds. When they totally burn:
The hydrogen oxidizes to water while the carbon turns into carbon dioxide (remember that water, H2O, is an oxide of hydrogen)
for full combustion:
hydrocarbon + oxygen→Carbon dioxide + water
The following equations describe how propane, which is used in bottled gas, completely burns.
oxygen + propane→carbon dioxide + water
C3H8 + 5O2 → 3CO2 + 4H2O
2) Incomplete combustion:-When there is insufficient air or oxygen present, incomplete combustion ensues. Carbon dioxide is still created, but it is replaced with carbon monoxide and carbon.
For incomplete combustion in general:
Hydrocarbon + Oxygen→ Carbon Monoxide + Carbon+ Water
incomplete propane combustion, which results in the production of carbon rather than carbon monoxide
oxygen + propane→carbon + water
C3H8 + 2O2 → 3C + 4H2O
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All of these tools are used for science but which tool is used specifically for earth science
Tools which are specifically used for earth science are Temperature Scales which are Celsius, Fahrenheit, and Kelvin.
Temperature tell us about how hot or cold a body is. Temperature is crucial in many disciplines of research, from physics to geology, as well as in most aspects of our daily lives.The temperature scale is a tool that is primarily utilised in Earth science. In metrology, the temperature scale is a mechanism for calibrating the physical quantity temperature.Alcohol, liquid crystal, and infrared radiation thermometers are the three types of thermometers (pyrometer).Celsius, Fahrenheit, and Kelvin are the three primary temperature scales. Temperature conversion equations are used to convert temperatures from one scale to another.At a single pressure and temperature known as the triple point, the three phases of water (ice, liquid water, and water vapour) may coexist.So we can conclude that the temperature scales which is specifically Celsius, Fahrenheit, and Kelvin are specifically used for earth science.
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I need help with the solution
Answer:
2.) C₆H₆O₂
Explanation:
(Step 1)
To find the molecular formula of hydroquinone, you need to first determine the molar mass of the empirical formula. The molar mass is a sum of the individual atomic weights of each element multiplied by their quantities (denoted by the subscripts).
Atomic Weights:
Carbon (C): 12.011 g/mol
Hydrogen (H): 1.008 g/mol
Oxygen (O): 15.998 g/mol
Molar Mass (C₃H₃O): 3(12.011 g/mol) + 3(1.008 g/mol) + 15.998 g/mol
Molar Mass (C₃H₃O): 55.055 g/mol
(Step 2)
As you can see, the molar mass of the empirical formula is not the same as the molar mass of the molecular formula. Rather, the empirical molar mass is approximately half of the molecular molar mass. Therefore, to make these masses equal, we need to double the empirical formula. This can be done by multiplying all of the subscripts by 2.
55.055 g/mol x 2 = 110.11 g/mol
110.11 g/mol = 110.108 g/mol
C₃ x 2 = C₆
H₃ x 2 = H₆
O x 2 = O₂
Therefore, the correct molecular formula of hydroquinone is C₆H₆O₂.
The electron configuration of an element is 1s22s22p4.
Describe what most likely happens when two atoms of this element move toward each other.
The likely thing which happens when two atoms of this element move toward each other is covalent bonding.
What is Covalent bonding?This involves the atoms of element sharing electrons in order to achieve a stable octet configuration.
The element is oxygen which has an atomic number of 8 and needs two electrons to complete its outermost shell which results in the formation of two covalent bonds.
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