Stoichiometry relates moles of rectant to moles of product
In order for plants to go through photosynthesis, they must use
A. X rays.
B. visible light.
C. infrared rays.
D. ultraviolet light.
Reacting 35.4 ml of 0.220 m agno3 with 52.0 ml of 0.420 m k2cro4 results in what mass of solid formed
If generating a key for this data, what is the correct sequence from bottom to top?
Generating a key from bottom to top signifies rearranging data in a particular order, often used in sorting or indexing processes. The actual sequence depends on the set rules, such as alphabetically or numerically.
Explanation:The correct sequence from bottom to top when generating a key for data, generally implies rearranging the data in a specific order. Let's consider a scenario in which we have data items named A, B, C, and D from bottom to top. In this case, the correct sequence from bottom to top might be D, C, B, A, assuming we're ordering in reverse-alphabetical order. However, the exact sequence can depend on the specific criteria or rules you're using to generate the key.
These keys are often used in computer operations such as sorting and indexing to manage and locate data efficiently. It's always important to understand the specific context in which the key is being applied for an accurate sequence.
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Which two gases are most abundantly emitted in volcanic outgassing?
a. nitrogen and oxygen
b. hydrogen and helium
c. carbon dioxide and methane
d. water vapor and sulfur dioxide?
Answer: d. water vapor and sulfur dioxide?
As per result of studies done on volcanic eruptions, Water vapor (H2O), carbon dioxide (CO2), and sulfur dioxide (SO2) are the most common volcanic gases abundantly emitted in volcanic outgassing. Other gases like carbon monoxide, methane and hydrogen are released in lesser amounts.
Answer:
water vapor and sulfur dioxide.
Nuclear power plants produce a waste product of cesium-137, which has a half-life of 30 years. how long would it take for the cesium to decay to 1/8 of its original amount?
Answer:
90 years
Explanation:
it takes three halves of one to get to 1/8.
So 30 times 3 = 90
If 2500. J of energy are added to 120. g of benzene at 30. degrees C, what will be its final temperature?
The final temperature of benzene after adding 2500 J of energy is 41.97°C.
To determine the final temperature of benzene after adding 2500 J of energy, we can use the formula for specific heat capacity:
q = mcΔT
Where:
q is the heat added (2500 J)m is the mass of benzene (120 g)c is the specific heat capacity of benzene (1.74 J/g°C)ΔT is the change in temperatureRearranging the formula to solve for ΔT:
ΔT = q / (mc)
Substitute the given values:
[tex]\Delta T = \frac{2500 \, \text{J}}{120 \, \text{g} \times 1.74 \, \text{J/g \textdegree C}}\\\\\Delta T = \frac{2500 \, \text{J}}{208.8 \, \text{J/°C}} \approx 11.97 \textdegree C[/tex]
Add this change to the initial temperature of 30°C:
Final temperature = 30°C + 11.97°C = 41.97°C
Therefore, the final temperature of the benzene after adding 2500 J of energy is 41.97°C.
When an arrhenius base is dissolved in h2o, the only negative ion present in the solution is?
Relating ideas explain why ionic crystals melt at much higher temperatures than typical covalent molecular crystals.
Which of the following objects does not decompose?
A) Tinfoil
B) Plastic Water Bottle
C) Lumber
D) Milk Carton
Final answer:
A) Tinfoil, which is made of aluminum, does not decompose as it is not an organic material. Plastic water bottles and milk cartons can take significant time to decompose due to their plastic components, while lumber, being organic, does decompose naturally.
Explanation:
The object that does not decompose among the ones listed is A) Tinfoil. Decomposition is a process that typically involves the breakdown of organic material by microorganisms. Tinfoil, which is made of aluminum, is not an organic material and thus does not decompose in the same way organic substances, like lumber, do. A plastic water bottle can take a very long time to decompose, often hundreds of years, but it can eventually break down, although not as readily as organic materials. A milk carton typically contains both paper, which is organic and degradable, and a plastic lining, which can take a considerable amount of time to decompose. As such, milk cartons often have components that can degrade and others that are very resistant to degradation. On the other hand, lumber, which is wood, will decompose over time as it is an organic material.
Which determines whether the fire will have open flames?
Question 4 options:
flash point
fuel-air mix
exothermic energy
type of fuel
Write equations for the ionization of hno3 in water and the reaction of co32- with water. for each equation, identify the hydrogen-ion donor and hydrogen-ion acceptor. then label the conjugate acid-base pairs in each equation.
What volume of hydrogen will be produced at STP by the reaction of 78.33g of aluminum with excess water
To find the volume of hydrogen gas produced at STP from the reaction of 78.33g of aluminum with excess water, calculate the moles of aluminum, convert that to moles of hydrogen gas using stoichiometry, and then use the molar volume at STP to find 97.44 liters of hydrogen gas.
Explanation:To determine the volume of hydrogen produced at STP (Standard Temperature and Pressure) by the reaction of aluminum with excess water, we first need to write the balanced chemical equation for the reaction.
For aluminum reacting with water yielding aluminum hydroxide and hydrogen gas, the balanced equation is:
2 Al(s) + 6 H₂O(l) → 2 Al(OH)3(aq) + 3 H₂(g)From this equation, we can see that 2 moles of aluminum produce 3 moles of hydrogen gas. To find the moles of aluminum in 78.33g, we use the molar mass of aluminum (approximately 26.98 g/mol).
Calculate the number of moles of aluminum:Thus, the reaction of 78.33g of aluminum with excess water will produce 97.44 liters of hydrogen gas at STP.
what temperature does blood boil at (in Celsius Kelvin and Fahrenheit)
Blood boils at a temperature close to water's boiling point: 100°C, 373 K, or 212°F. This boiling point slightly varies due to dissolved substances. Understanding these values illustrates the relationship among different temperature scales.
When considering the temperature at which blood boils, it primarily depends on its composition, but generally, it is close to the boiling point of water. The boiling point of water is an important reference and is commonly known for each temperature scale:
Celsius (°C): Water boils at 100°C.Kelvin (K): Water boils at 373 K.Fahrenheit (°F): Water boils at 212°F.Human blood is mostly water, and hence its boiling point is similarly close; however, due to the presence of dissolved proteins, salts, and other substances, the exact boiling point may slightly vary. At normal atmospheric pressure, it is approximately 100°C (373 K or 212°F). This concept is an important illustration of the relationship among the temperature scales.
Which element is likely to be chemically unreactive? krypton (8 valence electrons) rubidium (1 valence electron) silicon (4 valence electrons) magnesium (2 valence electrons) bromine (7 valence electrons)?
where are the most reactive nonmetals located on the periodic table?
a. the second column from the right side of the table
b. the uppermost complete row of the table
c. the column at the far left side of the table
d. the rows at the bottom of the table connecting two sections
The most reactive nonmetals are found in the column second from the right side of the periodic table, also known as Group 17 or the halogens. They are highly reactive because they need to gain just one electron to complete their outer electron shell. Fluorine is the most reactive nonmetal.
Explanation:The most reactive nonmetals are located in the upper right section of the periodic table, in the column that is second from the right side. This column is known as Group 17, or the halogens. Halogens are highly reactive due to their propensity to gain an electron to fill their outer electron shells, and they exhibit rich variety of chemical behaviors.
Elements belonging to the same column or group, such as the halogens, share many chemical characteristics because they have the same number of valence electrons.
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Consider the rate law below.
What effect does doubling the concentration of each reactant have on the rate? The rate increases to two times the original rate. The rate increases to four times the original rate. The rate increases to six times the original rate. The rate increases to eight times the original rate.
Which one of these elements is an alkaline earth metal
How many grams of titanium (Ti, 47.90 g/mol) are in an instrument gear with 5.74x10^22 atoms of Ti
Answer:
Grams of Ti = 4.56 g
Explanation:
Given:
# atoms of Titanium = 5.74*10²²
To determine:
The mass of Ti in corresponding to the given number of atoms
Explanation:
1 mole of any substance contains Avogadro's number of atoms.
i.e. 1 mole of Ti = 6.023*10²³ atoms
Since 1 mole Ti = 47.90g,
47.90 g of Ti contains 6.023*10²³ atoms
Therefore, [tex]= \frac{5.74*10^{22} atoms*47.90g}{6.023*10^{23} atoms} =4.56\ g[/tex] of Ti would correspond to:
Calculate the mass of agcl that should be produced when an excess of agno3 is reacted with 500 mg
What is the molarity of a solution that contains 20.45 g of sodium chloride (NaCl) dissolved in 700.0 mL of solution?
Amino acids are monomers that join together in complex macromolecules called _____.
A.
phospholipids
B.
proteins
C.
carbohydrates
D.
polysaccharides
Amino acids combine to form complex macromolecules called proteins. Other listed macromolecules - phospholipids, carbohydrates, and polysaccharides - are not made from amino acids.
Explanation:Amino acids are the building blocks of proteins. They join together in a specific sequence to form these complex macromolecules. In the list provided, the correct answer is 'B. Proteins'. This is because phospholipids, carbohydrates, and polysaccharides are different types of macromolecules constructed from other monomers, not amino acids. The resulting protein structure determines its function in an organism.
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Which of the following is most likely to increase the rate of a reaction?
a. reducing the activation energy
b. decreasing the temperature
c. decreasing the concentration of the reactant in the reaction vessel
d. increasing the volume of the reaction vessel
The half-life of a certain tranquilizer in the bloodstream is 5050 hours. how long will it take for the drug to decay to 8686% of the original dosage? use the exponential decay model, upper a equals upper a 0 e superscript kta=a0ekt, to solve.
A) most reactions involve bond breaking and bond making. this equation shows what happens when methane (ch4) burns in oxygen (o2). mark the bonds broken in blue and the bonds formed in red.\
When CH₄ burns with the presence of O₂, CO₂ and H₂O are formed as the products. The balanced equation is;
CH₄ + 2O₂ → CO₂ + 2H₂O
When the reaction happens, 4 C-H bonds of CH₄ and O=O bond of O₂ are broken down to form 2 C=O bonds in CO₂ and 2 O-H bonds in H₂O.
The broken and formed bonds are marked in the image.
The "gas" that was used in ww i contained phosgene. into what corrosive chemical was this gas changed when it met with the moisture in the lungs
Question 13 unsaved the nonmetals in groups 5a, 6a, and 7a: question 13 options: lose electrons when they form ions. form ions with charges of 3-, 2-, and 1-, respectively. form positively charged ions. form ions with a numerical charge equal to their group number.
How does the law of conservation of mass apply to this reaction: C2H4 + O2 → H2O + CO2?
50 POINTS!! 10. A weak acid with an initial pH of 3.2 was titrated with a strong base. 15 mL of 0.1 M NaOH was added to the acid to reach the equivalence point at a pH of 8.6. What would you expect the approximate pH of the analyte to be after the first 5 mL of 0.1 M NaOH was added?
8.6
3.4
5.1
7.2
Answer : Option C) 5.1
If we consider any weak acid and strong base titration. We usually observe that the pH initially rises quite fast then remains constant during the buffer region before rising rapidly to the end point.
So, if 5 mL of NaOH is considered to be the one third of the way to the endpoint, then after the initial rise which will be more than 3.4 and reaching to the buffer region before rising to the endpoint.
Now, if endpoint has pH of 8.6 a buffer region around 5 is a good but the acid could be acetic acid which has similar pH endpoints with the pKa of 4.74 - so buffer region around 5 will be the good condition.
And hence pH of 5.1 is the most probably the right answer.
5.1 would be the clostest answer
The heating curve below shows the temperature change that occurs as a solid is heated. What is occurring at segment CD of the graph? (3 points)
A line graph showing the heating curve of a substance being heated from the solid phase all the way to the gas phase. From left to right across the x-axis, the different regions of the heating curve are labeled with variables A through F. First, there is an incline with a positive slope labeled AB, followed by a horizontal region labeled BC. Then there is another incline with a positive slope labeled CD, followed by another horizontal region labeled DE. The end of the heating curve shows another incline with a positive slope labeled EF.
boiling a liquid
melting a solid
heating a liquid
heating a solid
How is heat transferred through thermal conduction?
Answer:
Heat is transferred through contact between molecules.
Explanation:
a-p-e-x
An analogy to define the term half-life?