Answer:
Bakelite
Explanation:
Bakelite is a non recyclable plasticSimilar to Melamine it has some of very bad heat and electricity conducter.So it's used in electrical switchesAl2O3(s)+3CO(g)→2Al(s)+3CO2(g) Express your answer in kilojoules to one decimal place.
Based on the standard heat of formation of aluminium oxide, the heat of the reaction of the decomposition of aluminium oxide is +3339.6 kJ
What is the heat of reaction?The heat or enthalpy of a reaction is the amount of heat evolved or absorbed when reactant molecules when reactants form products.
Considering the given reaction:
2 Al2O3(s) -> 2 Al(s) + 3 O2(g)The heat of formation of aluminum oxide is -1669.8 kJ/mol.
The heat of the reaction of the decomposition of aluminium oxide is calculated as follows:
Heat of reaction = Heat of formation of products - Heat of formation of reactants
Heat of reaction = {3 × ΔHf°O2 (g) + 2 × ΔHf° Al(s)} - 2 × ΔHf° Al2O3 (s)
Since the standard enthalpy of formation,ΔHf°, of an element in its most stable form is equal to zero.
ΔH°rxn = (3 × 0 + 2 × 0) - 2 × -1669.8 kJ/
ΔH°rxn = +3339.6 kJ
Therefore, the heat of the reaction of the decomposition of aluminium oxide is +3339.6 kJ
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What is the hydroxide ion concentration of an aqueous solution with a ph of 3. 45
the solution is an alkali
The hydroxide ion concentration of an aqueous solution with a ph of 3. 45 is 10⁻³·⁴⁵
What is pH?PH is potential hydrogen. It helps in to determine the acidity and basicity of any solution.
To get the hydroxide ion concentration of an aqueous solution, the following formula will be used.
[tex]pH = -log^[^H^+^]\\pH=-log^[^H^3^O^+^]\\\\-log [^H^3^O^+^] - pH\\ 10 ^-pH = [H3O^+] \\\\H3O^+ = 10^-^3^.^4^5[/tex]
Thus, the hydroxide ion concentration is 10⁻³·⁴⁵
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how much electrical energy (in kilowatt-hours) would a 60.0W light bulb use in 60.0 days ifvleft steadily
Answer:
60w x 24 = 1440wh per day
1440 x 60 = 86400 WATTS HOUR FOR 60 DAYS
Explanation:
In short.
86400/1000 = 86.4kwh
brainiest me :> THANK YOU!
Answer:
86.4kwh
Explanation:
Why are flood plains desirable farm land in spite of the fact that they are prone to flooding?.
Flood plains are desirable farm land in spite of the fact that they are prone to flooding because of its high fertility.
Why are floodplains desirable farm land?Floodplains are very fertile agricultural areas because the floods carry nutrient-rich silt and sediment and deposited it that plains. Floodplains are flat which make easier farming.
So we can conclude that flood plains are desirable farm land because of its high fertility.
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Using p and q as variables, write formulas for calculating the probability of an offspring from a population having each of the following genotypes
The genotypes are not found in the question, but p and q can be used to calculate genotypic frequencies by using the equation p2 + 2pq + q2 = 1.
What is the Hardy–Weinberg principle?The Hardy–Weinberg principle is a model used in population genetics to estimate allele and genotypic frequencies in a population.
According to the Hardy–Weinberg principle, the sum of p + q is equal to 1, where p and q represent the dominant and recessive alleles, respectively.
The Hardy–Weinberg principle considers the absence of different evolutionary forces acting on the population.
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The formula for calculating the probability of an offspring from a population having each of the following genotypes is p2 + 2pq + q2 = 1.
What is the genotypic frequency?The number of people with a particular genotype divided by the total number of people in a population is known as genotype frequency.
p2 + 2pq + q2 = 1 is the Hardy Weinberg equation.
Thus, the formula for calculating the probability of an offspring from a population having each of the following genotypes is p2 + 2pq + q2 = 1.
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What is the percent composition of hydrogen in beryllium hydride, if 69.6g of beryllium with 15.6g of hydrogen to produce 85.2g of BeH2?
The percent composition of hydrogen is 18.3%.
What is percent composition?
The term percent composition refers to the percentage of a particular component in a compound. It is contained as the ratio of the mass of that component to the total mass multiplied by 100.
From the law of conservation of mass, total mass of beryllium hydride(BeH2) = 85.2 g
Mass of hydrogen = 15.6 g
Percent composition of hydrogen = 15.6 g/ 85.2 g × 100/1 = 18.3%
Round the mmHg readings to the nearest whole number. Round the kPa readings to the nearest tenth. Round the atm readings to the nearest hundredth. Convert a pressure of 1.76 atm to _____ torr.
i love jesus and i love my mommy
Nitrogen is contained in which of the following?
a. adenine.
b. cytosine.
c. guanine.
d. thymine. d. uracil.
Answer:
DNA contains four nitrogen bases: adenine, thiamine, guanine and cytosine. Adenine and thymine pair, and guanine and cytosine pair.
Explanation:
In combination, nitrogen is found in the rain and soil as ammonia and ammonium salts and in seawater as ammonium (NH4+), nitrite (NO2−), and nitrate (NO3−) ions...
The ph of a solution is 2. 0. Which statement is correct? useful formulas include startbracket upper h subscript 3 upper o superscript plus endbracket equals 10 superscript negative p h. , startbracket upper o upper h superscript minus endbracket equals 10 superscript negative p o h. , p h plus p o h equals 14. , and startbracket upper h subscript 3 upper o superscript plus endbracket startbracket upper o upper h superscript minus endbracket equals 10 to the negative 14 power. The poh of the solution is 12. 0. The concentration of oh– ions is 1. 0 mc021-5. Jpg 10–2 m. The concentration of upper h subscript 3 upper o superscript plus. Ions is 100. 0 m. The poh of the solution is 16. 0.
If the pH of the solution is 2.00. it follows that the pOH of the solution is 12.
What is pH?The term pH refers to the hydrogen ion concentration of the solution. It shows the degree of acidity in the solution. We also know that the pOH can be obtained from the pH using; pOH = 14-pH.
Hence, if the pH of the solution is 2.00. it follows that the pOH of the solution is 12.
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A compound has a percent composition of 38.7% carbon, 9.76% hydrogen, 51.5% oxygen.
Laboratory data shows that the compound's molar mass is 62.0 g/mol. What is the
molecular formula of the compound?
The molecular formula of the compound that has a percent composition of 38.7% carbon, 9.76% hydrogen, 51.5% oxygen is C2H6O2.
How to calculate molecular formula?The molecular formula can be calculated from the empirical formula. The empirical formula of the compound is calculated as follows:
C = 38.7% = 38.7gH = 9.76% = 9.76gO = 51.5% = 51.5gNext, we convert the mass to moles by dividing by their atomic mass:
C = 38.7 ÷ 12 = 3.23molH = 9.76 ÷ 1 = 9.76molO = 51.5÷ 16 = 3.22molNext, we divide by the smallest (3.22)
C = 1H = 3O = 1Hence, the empirical formula of the compound is CH3O
If the molar mass of the compound is 62g/mol;
(CH3O)n = 62
31n = 62
n = 2
(CH3O)2 = C2H6O2
Therefore, the molecular formula of the compound that has a percent composition of 38.7% carbon, 9.76% hydrogen, 51.5% oxygen is C2H6O2.
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True or false: water is weird. Normally the solid form of a substance is more
dense/compact than the liquid form. When water freezes it forms
crystalline structures that make the molecules spread out causing ice to be
less dense than water and float. This is true of all substances.
Answer:
this would be true friend :)
Explanation:
for density, it generally goes solids, liquids, then gas in order from most dense, to least dense.
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CH4 + 2 02 > CO2 + 2 H2O
A scientist wants to completely burn 25 L of methane.
How many molecules of oxygen will the scientist need to
complete this experiment?
Answer:
mf i was trying to
find out the same thing
Explanation:
Fluorine gas is placed in contact with calcium metal at high temperatures to produce calcium fluoride powder. What is the
formula equation for this reaction?
+
1.F2(1) + Na(s) — NaF2(s)
2.F2(g) + Ca(s) — CaF20)
3 F2(g) + Na(s) — NaF 2(0)
4. F2(g) + Ca(s) __, CaF2(s)
Answer: B aka #2
Explanation:
The Chemical equation for this reaction is F[tex]_2[/tex](g) + Ca(s) → CaF[tex]_2[/tex]. Therefore, the correct option is option B.
Chemical equations are symbols or chemical formulas that depict a chemical reaction symbolically. With a plus sign separating the entities in the reactants and products, the reactant objects are listed on the left as well as the product objects are listed on the right.
The critical values of a stoichiometric values are shown as coefficients alongside the symbols or formulas of the various entities. Fluorine gas is placed in contact with calcium metal at high temperatures to produce calcium fluoride powder. The formula equation for this reaction is
F[tex]_2[/tex](g) + Ca(s) → CaF[tex]_2[/tex]
Therefore, the correct option is option B.
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Which electromagnetic wave does the student replace the question mark with in the table?
A
radio waves
B
gamma rays
C
infrared waves
D
visible light waves
Answer:
B) Gamma
Explanation:
Gamma is by far the most powerful, and only one that can produce this much energy
option c is your answer.
The periodic table is arranged in order by which classification?.
Answer:
Atomic weight and valence electrons
Explanation:
These variables allow Mendeleev to place each element in a certain row and column. The table comprises 7 rows and 18 columns.
Burning fossil fuels creates the ___________ gas carbon dioxide which increases global temperatures.
Question 4 options:
greenhouse
fossil
inert
poisonous
Answer:
green house gas
Explanation:
The chemical equation shows iron(iii) phosphate reacting with sodium sulfate. 2fepo4 3na2so4 right arrow. fe2(so4)3 2na3po4 what is the theoretical yield of fe2(so4)3 if 20.00 g of fepo4 reacts with an excess of na2so4? 26.52 g 53.04 g 150.8 g 399.9 g
Percentage yield tells the percentage ratio of actual to theoretical yield. The theoretical yield of iron(III) sulfate is 26.52 g.
What is a theoretical yield?The theoretical yield is the product formation from the complete modification of the limiting reagent in a chemical reaction.
The balanced chemical reaction is shown as,
[tex]\rm 2FePO_{4} + 3Na_{2}SO_{4} \rightarrow Fe_{2}(SO_{4})_{3} + 2Na_{3}PO_{4}[/tex]
Moles of ferric phosphate is calculated as:
[tex]\begin{aligned} \rm n &= \rm \dfrac{mass}{molar \; mass}\\\\&= \dfrac{20}{150.82}\\\\&= 0.1326\;\rm mol\end{aligned}[/tex]
From the reaction,
[tex]\dfrac{1 \;\rm mol \; Fe_{2}(SO_{4})_{3} }{2 \;\rm mol \; FePO_{4}}&= \dfrac{\rm X}{ 0.1326 \;\rm mol \; FePO_{4}}[/tex]
Solving for X:
[tex]\begin{aligned} \rm X &= (\dfrac{0.1326}{2}) \times 1 \rm \; mol\\\\&= 0.0663 \;\rm mol \;Fe_{2}(SO_{4})_{3}\end{aligned}[/tex]
Calculating mass from moles:
[tex]\begin{aligned}\rm mass &= \rm moles \times molar \rm \; mass\\\\&= 0.0663 \;\rm mol \times 399.88 \;\rm g/mol \\\\&= 26.51\;\rm g\end{aligned}[/tex]
Therefore, option A. 26.52 gm is the mass of iron(III) sulfate.
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Answer:
A) 26.52
Explanation:
word equation for water
Answer:
The actual reaction to make water is a bit more complicated: 2H2 + O2 = 2H2O + Energy. In English, the equation says: To produce two molecules of water (H2O), two molecules of diatomic hydrogen (H2) must be combined with one molecule of diatomic oxygen (O2). Energy will be released in the process.
Explanation:
Consider the reaction 2NaN3 → 2Na + 3N2, which is the first reaction that occurs when an air bag expands in a car undergoing a collision. This reaction happens very quickly, as you might suspect.
A graph showing the amount of nitrogen gas (N2) could be best described as which sentence?
A.) The graph line’s general trend is decreasing from left to right.
B.) The graph line’s general trend is absolutely horizontal.
C.) The graph line’s general trend is nearly horizontal.
D.) The graph line’s general trend is increasing from left to right.
Answer:
D) The Graph line’s general trend is increasing from left to right.
Explanation:
N2, a product, will increase over time which means the line of the graph would go up over time. Time increases from left to right so the correct answer is D.
The graph that describes the reaction will have a trend in which the graph is decreasing from left to right.
What is a collision?A collision occurs when two particle bump into each other. We know that a reaction takes place when there is an effective collision between the reacting particles.
In this case, the graph that describes the reaction will have a trend in which the graph is decreasing from left to right.
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Write balanced equations and expressions for ksp for the dissolution of each of the following ionic compounds. Write a balanced equation for the dissolution of baso4
Based on the dissolution equation of BaSO4, the solubility product, Ksp, expression of BaSO4 is: [Ba^{2+}] × [SO4^{2-}]
What is solubility product Ksp of a solute?The solubility product, Ksp, of a substance is an equilibrium constant which expresses the product of the concentration of ions produced by a solute.
The solubility of a solute depends on temperature, thus solubility product also depends on temperature.
The balanced equation for the dissolution of barium sulfate is given below:
BaSO4 ⇌ Ba^{2+} + SO4^{2-}The solubility product for barium sulfate is given as;
Ksp = [Ba^{2+}] × [SO4^{2-}]
Therefore, the solubility product, Ksp, expression of BaSO4 is: [Ba^{2+}] × [SO4^{2-}]
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How does acid react to water mixed with clorine eyedrops
Answer: Chlorine gas is produced when sulfuric acid is mixed with chlorine bleach.
Explanation: This reaction is a function of the change in pH of the solution from alkaline to acidic combined with the strong oxidant properties of hypochlorous acid.
Make sure to reword this in your words!!!Acidic oxides are common air pollutants and the source of acid precipitation. Basic oxides are not. Use what you know about these oxides to explain this difference.
Answer:
An acidic oxide reacts with water and produces acid. They are also called acid anhydride, which are oxides that react with water to form an acid, or with a base to form a salt. They are oxides of either nonmetal or of metals in high oxidation states. An oxide is a binary compound that we obtain upon the reaction of oxygen with other elements. Their chemistry can be systematically understood by taking an oxoacid and removing water from it until only an oxide remains. The resulting oxide belongs to this group of substances. Usually, it is the oxide of non-metals. For example, sulfurous acid (SO2), sulfuric acid (SO3), and carbonic acid (CO2) are acidic oxides. Thus, CO2 dissolves in water to give carbonic acid, and NO2 gives a mixture of nitrous and nitric acids. An inorganic anhydride (a somewhat archaic term) is an acid anhydride without an organic moiety.
Explanation:
60 points please help me i will appreciate it!
Answer:
[tex]\huge\boxed{\sf T = 682.4 \ K}[/tex]
Explanation:
Given Data:
Mole = n = 0.1 mol
Pressure = P = 530 mmHg = 0.7 atm
Volume = v = 8 L
Ideal gas constant = R = 0.8206 L atm K⁻¹ mol⁻¹
Required:
Temperature = T = ?
Formula:
Pv = nRT
Solution:
Rearranging for T
[tex]\displaystyle T = \frac{Pv}{nR} \\\\T = \frac{(0.7)(8)}{(0.1)(0.08206)} \\\\T = \frac{5.6}{0.008206} \\\\T = 682.4 \ K\\\\\rule[225]{225}{2}[/tex]
The equilibrium for the reaction between (ch3)2nh a weak base
The equilibrium for the dissolution of the weak base is ;(CH3)2NH(aq) + H2O(l) ⇄ (CH3)2NH3^+(aq) + OH^-(aq)
What is a weak base?A weak base is one that does not ionize completely in solution. As such, a weak base will have a very low base dissociation constant Kb reflecting its minimal dissociation in solution.
The question is incomplete hence we are are unable to work out the equilibrium but in solution it will look like this;
(CH3)2NH(aq) + H2O(l) ⇄ (CH3)2NH3^+(aq) + OH^-(aq)
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The equilibrium for the reaction between (Ch₃)2NH of the weak base is (CH₃)2NH(aq) + H₂O(l) ⇄ (CH₃)2NH₃⁺(aq) + OH⁻(aq).
What are weak bases?A weak base is one that does not completely dissociate in water.
It leaves only a small proportion of hydroxide ions and the concerned basic radical in the resulting aqueous solution.
A large proportion of dissociated base molecules.
Thus, the equilibrium for the reaction is (CH₃)2NH(aq) + H₂O(l) ⇄ (CH₃)2NH₃⁺(aq) + OH⁻(aq).
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correct answer is A
a detailed explaination would be appreciated
Answer:
yh correct answer is A
Explanation:
the reason is because
Given the following reaction, what is the conjugate acid of ammonia?
The ammonium ion is formed when ammonia accepts a proton from an acid.
What is conjugate acid?The term conjugate acid refers to a specie that is formed when a base accepts a proton. The conjugate acid of ammonia is the ammonium ion.
This is because, the ammonium ion is formed when ammonia accepts a proton from an acid.
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Animals burrow into soil is this mechanical weathering or chemical weathering
Answer:
Animals also contribute to mechanical weathering. Digging animals such as moles break apart rocks underground, while the movement of animals on surface rock can scratch the rock's surface or exert pressure that causes the rock to crack.
Explanation:
pls brainlist me, correct me if I'm wrong
Can someone please help me? :(
Answer:
Zone A
Explanation:
Because, when facing the sun, the "A" zones would be furthest from the sun, they get the least amount of sunlight (also shows why they are the coldest parts).
How to know if a single replacement reaction will occur
Answer:
To determine whether a given single replacement will occur, you must use an “Activity Series” table. If the metal or the halogen is above the element it will replace based on the activity series, a single displacement reaction will occur. The video below summarizes an experiment conducted to compare the activities of three metals ( Mg, Cu and Zn ).
Explanation:
Single replacement reaction will occur if any more active specie will add on the solution.
What is single displacement reaction?Single displacement reactions are those reactions in which one element from the given molecule is displaced by some other element.
Generally displacement reactions are shown by metals when more reactive metal is added in the solution of any another metal. Then more reactive metal displaces the metal which is already present in the solution and reaction is taking place is shown by changing in color.
Hence single displacement reaction will occur when more reactive metal is added in any solution.
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PLEASE HELP
2. Calcium hydroxide, used to neutralize acid spills, reacts with hydrochloric acid to produce calcium
chloride and water. If you spilled 85.0 grams of hydrochloric acid and put 120 grams of calcium
hydroxide on it, which one is the limiting reactant? Answer:
Answer:
hydrochloric acid (HCl)
Explanation:
balanced equation: Ca(OH)2+2HCl -> CaCl2+2H2O
85.0/36=2.33 mol HCl
120/74=1.62 Ca(OH)2
2.33 mol HCl x 1 mol CaCl2/2 mol HCl = 1.165 mol CaCl2
1.62 mol Ca(OH)2 x 2 mol CaCl2/1 mol Ca(OH)2 = 3.24 mol CaCl2