Answer:
1.Electrical energy
2. Toaster
3. Music heard from a radio
What is produced by the process of meiosis?
a) Cells that are exact copies of all the other daughter cells.
b) Cells that are an exact copy of the parent cell.
c) Cells that contain the exact number of chromosomes present in the parent cell.
d) Cells that contain half of the number of chromosomes present in the parent cell.
Answer:
Cells that contain half of the number of chromosomes present in the parent cell.
Explanation:
Meiosis is a type of cell division necessary for sexual reproduction. Meiosis produces four cells that contain half of the number of chromosomes present in the parent cell.
Final answer:
Meiosis produces four haploid daughter cells with half the number of chromosomes as the parent cell, which, in humans, results in cells with 23 chromosomes.
Explanation:
The process of meiosis results in the production of gametes, which are sex cells like eggs and sperm. During this intricate process of cell division, DNA is copied once, and then the cell divides twice, ultimately producing four daughter cells that each contain half the number of chromosomes as the original parent cell. In humans, for instance, where the parent cell contains 46 chromosomes, meiosis results in daughter cells with only 23 chromosomes.
These cells are termed haploid, compared to the diploid state of the original parent cell, which contains two sets of chromosomes. As a result, the correct answer to the student's question is option (d): Cells that contain half of the number of chromosomes present in the parent cell.
A volume of 60.0 mL of a 0.120 M HNO3 solution is titrated with 0.840 M KOH. Calculate the volume of KOH required to reach the equivalence point.
In this chemistry question, the volume of KOH required to reach the equivalence point in this titration is 8.57 mL. This was calculated by first determining the moles of HNO3 in the solution and then using this to determine the equivalent volume of KOH.
Explanation:In a titration, the volume of one solution required to neutralize another can be calculated using the concept of equivalence points and moles. Since the reaction between HNO3 and KOH is a 1:1 reaction, we can first calculate the moles of HNO3 in the solution: 0.120 mol/L * 0.060 L = 0.0072 mol. In a 1:1 reaction, equal moles of both reactants are required, so the amount of KOH needed is also 0.0072 mol. The concentration of KOH is given as 0.840 M, so we can calculate the volume (V) needed using the formula V = Moles/Concentration. Hence, the volume of KOH needed is 0.0072 mol / 0.840 mol/L = 0.00857 L or 8.57 mL.
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To find the volume of KOH required to reach the equivalence point in a titration with HNO₃, we use the molarities and volumes given, and apply the stoichiometry of the balanced equation, which in this case is a 1:1 molar ratio. The required volume of KOH is calculated to be 8.571 mL.
The question asks to calculate the volume of KOH required to reach the equivalence point in a titration with HNO₃. The balanced chemical equation for the reaction is:
HNO₃ (aq) + KOH (aq) → KNO₃ (aq) + H2O (l)
At the equivalence point, the moles of HNO₃ will be equal to the moles of KOH due to the 1:1 molar ratio of their reaction:
Moles of HNO₃ = 0.060 L × 0.120 M = 0.0072 mol
Using the molarity of KOH, we can find the volume needed:
Volume of KOH = Moles of HNO₃ / Molarity of KOH = 0.0072 mol / 0.840 M = 0.008571 L or 8.571 mL
Therefore, 8.571 mL of 0.840 M KOH is required to reach the equivalence point when titrating 60.0 mL of 0.120 M HNO₃.
2. The combined mass of a class of 25 students is about
800 mg
800 g
800 kg
8 t
Answer: i think that it was 800 mg
Explanation:
Calculate the empirical formula the compound with the following percent composition: 27.59%C 1.15%H 16.09%N 55.17%O
Answer: C2HNO3
Explanation: C = 27.59/12.011 = 2.297
H = 1.15/1.008 = 1.1409
N = 16.09/14.007 = 1.1487
O = 55.17/15.999 = 3.4483
Divide by smallest result:
C = 2
H=1
N=1
O = 3
Empirical formula = C2HNO3
To determine the empirical formula for a compound with percent composition values for carbon, hydrogen, nitrogen, and oxygen, convert the masses to moles, divide by the smallest number of moles among the elements, and simplify the ratios to get the empirical formula, which is CHNO₃ for this example.
To calculate the empirical formula of a compound based on its percent composition, we start by assuming we have 100 grams of the compound. This means that the given percent compositions can be directly converted into grams. With the compound containing 27.59% carbon (C), 1.15% hydrogen (H), 16.09% nitrogen (N), and 55.17% oxygen (O), we have 27.59 g of C, 1.15 g of H, 16.09 g of N, and 55.17 g of O.
Next, we convert these masses to moles using the molar masses of the elements:
C: 27.59 g / 12.01 g/mol = 2.298 moles
H: 1.15 g / 1.008 g/mol = 1.141 moles
N: 16.09 g / 14.01 g/mol = 1.148 moles
O: 55.17 g / 16.00 g/mol = 3.448 moles
Afterward, we divide the moles of each element by the smallest number of moles we have obtained:
C: 2.298 moles / 1.141 = 2.015 (approx. 2)
H: 1.141 moles / 1.141 = 1
N: 1.148 moles / 1.141 = 1.006 (approx. 1)
O: 3.448 moles / 1.141 = 3.023 (approx. 3)
Therefore, the empirical formula of the compound is CHNO₃.
How might Rebecca Flowers have felt when she found new evidence about the Grand Canyon. Cite an example from the text to support your answer.
Final answer:
Rebecca Flowers likely experienced excitement and validation upon finding new evidence about the Grand Canyon, as indicated by the rich detail and awe of Moran's paintings and the significant breakthroughs detailed in Powell's sketches.
Explanation:
Rebecca Flowers may have felt a mixture of excitement and validation when she found new evidence about the Grand Canyon. When researchers discover something new, like evidence that challenges existing theories or contributes significantly to our understanding of a subject, it is often accompanied by a profound sense of achievement.
An example from the text that supports the feelings of accomplishment and exhilaration is in the description of the landscape in Moran's painting: “The Grand Canyon of the Colorado River is another of Moran's works to illustrate the immeasurable spaces in the American West.”
The rich detail and awe-inspiring portrayal of the Grand Canyon also reflect the deep impact and vast significance of such discoveries.
Additionally, John Wesley Powell's identification of the "Great Unconformity" in the Grand Canyon signifies a moment of breakthrough, akin to how Rebecca Flowers might have felt.
The detailed sketches Powell made and his method of labeling serve as a reminder of the diligence and meticulous work required in research, which when leading to a significant find, could provide researchers with a profound sense of satisfaction and triumph.
Final answer:
Rebecca Flowers might have felt excited and curious when she found new evidence about the Grand Canyon, mirroring feelings shared by researchers upon making novel discoveries.
Explanation:
Rebecca Flowers likely felt a mixture of excitement, curiosity, and possibly apprehension when she discovered new evidence about the Grand Canyon. It's common for researchers to experience a thrill upon uncovering something novel that could potentially shift current understanding. An analogous situation from text might be reflected in the phrase, "When one is confronted by new information that does not fit tidily onto her personal map..." which suggests a sense of disorientation yet an opportunity to expand one's knowledge horizon.
In literature that discusses scholarly discoveries or studies, phrases such as "new evidence" and the process of incorporating this information into existing knowledge frameworks can be particularly challenging but rewarding. Another example would be a researcher using a "comparison-and contrast reasoning strategy" to identify a new species, revealing the thrill of scientific pursuit and the meticulous nature of academic investigation.
A cylinder with a constant volume of 2.80 L has a pressure of 32.0 psi at a temperature of 25 deg Celcius. If the cylinder is warmed to a temperature of 75 deg. Celcius, what will be the pressure inside the cylinder?
Ideal gas law is valid only for ideal gas not for vanderwaal gas. Charles' gas law is used here. Therefore the new pressure of the given gas is 5.63 atm.
What is ideal gas equation?
Ideal gas equation is the mathematical expression that relates pressure volume and temperature. Vanderwaal gas acts as ideal gas at low pressure and high temperature. There is no forces of attraction between the particles of an ideal gas.
Mathematically the relation between Pressure, volume and temperature can be given as
PV=nRT
where,
P = pressure of gas
V= volume of gas
n =number of moles of gas
T =temperature of gas
R = Gas constant = 0.0821 L.atm/K.mol
At constant volume
P₁/T₁ = P₂/T₂
32.0 psi ÷298 K =P2÷348 K
P2 = 7.55÷1.34 = 5.63 atm
Therefore the new pressure of the given gas is 5.63 atm.
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Choose the products that complete the reaction. The chemical equations may not be balanced. HCl + NaOH ? NaCl + H2O NaCl + CO2 + H2O NaCl + H2
Answer:
a- NaCl + H20
If 3 moles of a compound use 12 J of energy in a reaction, what is the A
Hreaction in kJ/mol?
Answer:
36kj/mol
Explanation:
How many moles of O2 are needed to produce 50.0 moles of CO2?
2 C8H18 + 25 O2 --> 16 CO2 + 18 H20
a) 78.1 moles
Answer:
4 moles
Explanation:
Please see the step-by-step solution in the picture attached below.
Hope this answer can help you. Have a nice day!
Consider the following generic chemical reaction:
2A+3B→3C How many moles of B are required to completely react with: 8 mol of A, 9 mol of A, 3 mol of A, and 10 mol of A?
Answer:
The number of moles of B that will completely react with;
8 moles of A is 12 moles of B
9 moles of A is 13.5 moles of B
3 moles of A is 4.5 moles of B
10 moles of A is 15 moles of B
Explanation:
From the reaction, we have the mole ratio of the reactants is 2 moles of A combines with 3 moles of B to form 3 moles of C
Therefore, one mole of A which is 2 moles/2 will combine with 3/2 moles of B
Hence 8 moles of A will combine with 8×3/2 or 12 moles of B
9 moles of A will combine with 9×3/2 or 13.5 moles of B
3 moles of A will combine with 3×3/2 or 4.5 moles of B
10 moles of A will combine with 10×3/2 or 15 moles of B
The number of moles of B reacted in each case is obtained by stoichiometry.
The representation of a chemical process on paper is known as a chemical reaction equation. It must consist of a reactant side and a product side. The reactants combine to yield the product.
Given the reaction; 2A + 3B → 3C, we can see that the mole ratio of the reactants is 2 : 3. Hence;
2 moles of A reacts with 3 moles of B
8 moles of A reacts with 8 moles × 3 moles/2 moles
= 12 moles B
2 moles of A reacts with 3 moles of B
9 mol of A reacts with 9 mol × 3 moles/2 moles
= 13.5 moles of B
2 moles of A reacts with 3 moles of B
3 mol of A reacts with 3 mol × 3 moles/2 moles
= 4.5 moles of B
2 moles of A reacts with 3 moles of B
10 mol of A reacts with 10 mol × 3 moles/2 moles
= 15 moles of B
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If 10 staples have a mass of 1.33 g, what will be the mass of 225 staples?
A.
29.9 g
B.
169 g
C.
1.69 kg
D.
2.99 kg
Answer:
A) 29.9g
Explanation:
first find the weight of 1 staple.
then multiply with 225
Answer: A
Explanation: 1.33/10 = .133
.133* 225 = 29.925 which is about 29.9 grams
A balloon starts off with 0.00035 moles of air and has a volume of 0.0081
L. It is inflated to a size of 1.5 L, how many moles of air are in the balloon
now?
Answer:
0.0648 mols
Explanation:
What are the other types of particles that make up a water particle?
Answer:Well, if you mean atoms, it has 2 Hydrogen atoms and 1 Oxygen.
Explanation:Water is H20 therefore, it has 2 Hydrogen atoms and 1 Oxygen. Water isn't made up of particles, they are made of atoms.
I need help on this question!!
(The actual question and options are in the picture below)
Answer:
A
Explanation:
This picture represents a stationary front. Stationary fronts often form clouds and, in particularly low pressure, have rain or snow. Therefore, the first answer choice is correct. Hope this helps!
Based on your graph in the Periodic Trends Lab, what is the relationship between atomic radius and ionization energy ?
Consider the complete oxidation of palmitoleic acid,
CH3—(CH)5-CH=CH-(CH2)-COOH, which is a C16
monounsaturated fatty acid found in animal and vegetable oils.
a. How many cycles of ß oxidation are needed?
b. How many acetyl CoA are produced?
c. How many ATP are generated from the oxidation of palmi-
toleic acid?
Answer:
hunit
Explanation:
5
the following diagram shows an amoeba and a plant. which of the following identifies the primary difference between the two organisims?
Question 1 options:
A)The amoeba can produce its own food.
B)The amoeba contains only one cell.
C)The amoeba cannot conduct respiration.
D)The amoeba has organs.
The primary difference between an amoeba and a plant is that the amoeba is unicellular, meaning it consists of a single cell, whereas a plant is multicellular and has many cells that form tissues and organs. Option B is correct.
The main difference between an amoeba and a plant is how they obtain their nutrients. The choice from the provided question options that correctly identifies the primary difference is: The amoeba contains only one cell.
An amoeba is a type of unicellular organism which means it consists of a single cell, while a plant is multicellular and consists of many cells that are organized into tissues and organs. Amoebas consume their food by engulfing it through a process called endocytosis, using the food as a material source and an energy source.
In contrast, plants produce their own food through a process called photosynthesis, using sunlight to convert carbon dioxide and water into sugars and oxygen. Photosynthesis mainly occurs in the leaves of plants where cells contain chloroplasts, which are specialized organelles for this process.
How did the Sumatra-Andaman earthquake cause so much damage if it occurred in the middle of the Indian Ocean? The earthquake produced a tsunami that caused the destruction. It didn't cause a lot of damage because it was in the ocean. Much marine life was killed. Many sailors and fishermen were killed.
Explanation: because of the waste and junk put into the ocean that must of backfired to the land and the wind would blow stuff at the area hope this helped because I'm not 100% certain
Answer:
The earthquake produced a tsunami that caused the destruction.
Explanation:
The earthquake produced a tsunami that caused the destruction.
Vitamins are food.
True OR False
Answer: Hello!
False
Explanation:
hope you do good!they are in ur food though
Answer:
false
Explanation:
they're in food but doesnt make them food
It requires 2,500 joules to raise a certain amount of water (c = 4.186J/g°C) from 20.0°C to 65.0°C.
What is the mass of the water that is being heated?
a 80 g
b 138
c 40 g
d 158 g
Answer:
The answer above is correct - the right option is A.
Explanation:
Hope this helped confirm!
A professor insists that a research scientist in her laboratory repeat an
experiment, despite the fact that the experiment took several weeks to
complete. Which best explains the professor's reasoning?
Answer:
This is to make sure that the experiment is precise as outside disturbance could cause false outcome
Explain why the two ecosystems have such different kinds of plants. Use the terms biotic factor, and limiting factor in the explanation????
Answer:
Two ecosystems might have different species of plant this is as a result of the nature of the ecosystem and the ability of plants to thrive in them.
Explanation:
An ecosystem can be defined as a community of organisms living together and interacting with their physical environment. There are different types of ecosystems but they are all categorized under terrestrial and aquatic habitats. They include forests, grasslands, deserts, freshwater and marine.
In the desert ecosystem an example of a plant that grows there is the cactus plant, this is as a result of their ability to conserve water.
In freshwater ecosystem, an example of a plant found there is the waterlily this is due to their unique ability to survive on water surfaces.
These different plant species are affected by different limiting factors in their ecosystems such as temperature, sunlight, nutrients.
True or false: Hurricane speed winds will have a high pressure compared to a normal day wind.
Help plz!!!
Answer:
I believe it is false.
Explanation:
When pressures get lower the chances of rain and high winds increase. When the pressure is high, it is usually clear and standard weather....... let me know if I am correct!
Which of the following would have the highest entropy?
A. A stack of books
B. A house of cards
C. A house made of blocks
D. A pile of laundry
A pile of laundry would have the highest entropy among the given options because it can have many configurations and does not display particular order, making its state more disordered. A building made of bricks has smaller entropy than a pile of bricks because it has fewer arrangements (microstates) that maintain its orderly structure (macrostate).
Explanation:The concept of entropy is associated with the idea of disorder in a system, with a system having high entropy being in a more disordered state. When comparing the options given (a stack of books, a house of cards, a house made of blocks, and a pile of laundry), the pile of laundry would have the highest entropy. This is because it can be arranged in a considerable number of configurations, as it does not display any particular order. In contrast, a stack of books, a house of cards, and a house made of blocks are all structured arrangements with lower entropy due to fewer configurations being available to them.
Explaining why a building made of bricks has smaller entropy than the same bricks in a disorganized pile: an organized structure, like a building made of bricks, has only a limited number of ways it can be put together (microstates) to maintain its orderly structure (macrostate), thereby representing a state of low entropy. On the other hand, a disorganized pile of bricks can be arranged in a vast number of ways, leading to a higher count of microstates and therefore, a higher entropy.
Final answer:
The highest entropy would be associated with a pile of laundry.
Explanation:
The concept of entropy in physics relates to the degree of disorder or randomness in a system. In this context, entropy is a measure of the number of ways a particular macrostate (arrangement or configuration) can be achieved by the microstates (individual arrangements of the system's elements).
Out of the given options, the highest entropy would be associated with a pile of laundry (option D). This is because laundry in a pile has a high degree of randomness and can be arranged in numerous ways, resulting in a large number of microstates. On the other hand, the stack of books (option A), house of cards (option B), and house made of blocks (option C) have lower entropy because they have a more ordered and structured arrangement, limiting the number of achievable microstates.
Which acid has the greatest acid dissociation constant?
carbonic acid
boric acid
nitric acid
Answer:
nitric acid
Explanation:
Molarity tells us ___.
A. whether a solution is considered weak or strong
B. how many grams of solute are dissolved in a given volume of solution
C. the likelihood that a given volume of solution will dissolve more solid
D. how many particles are dissolved in a given volume of solution
Answer:
The answer is
B.how many grams of solute are dissolved in a given volume of solution.
Explanation:
Molar concentration is a measure of the concentration of a chemical species, in particular of a solute in a solution, in terms of amount of substance per unit volume of solution
M=n/v
M-molar concentration
N-moles of solute
v-liters of solution
To find the molar concentration of a solution, simply divide the total moles of solute by the total volume of the solution in liters.
Molar concentration is the same as molarity, but molarity and molality are not the same thing. They are different ways to quantify the amount of solute in a solution, and the concentration of a solution in molarity is not interchangeable with its concentration in molality.
Source- Khan Academy, Wikipedia
how are cone bearing trees and static electricity connected
Answer: Static electricity will help in seed dispersal in cone bearing seeds.
Explanation:
Static electricity is the stationary electric charge produced by the friction. The static electricity can be produced by the turbulence or air currents in the storm clouds. This is responsible for the cause of lightening phenomena.
The cone bearing seeds exhibit cones that are hard and woody in nature. The static electricity due to the effect of lightening generate electrical shock which breaks open the cone and disperse the seeds. Thus the static electricity is important for seed dispersal in cone bearing trees.
CaCO3(s) + HCl → CaCl2(s) + CO2(g) + H2O(g)
A large amount of heat is generated by this reaction, so the water produced from the reaction is
usually driven off as steam. Some liquid water may remain, however, and it may dissolve some of the
desired calcium chloride. What is the percent yield if 155 g of calcium carbonate is treated with 250 g
of anhydrous hydrogen chloride and only 142 g of CaCl2 is obtained?
What is the valence of oxygen
Answer:
-2
Explanation:
eACH ELEMENT HAS AN SPECIFIC VALENCE, FOR EXAMPLE, CARBON (+2),+4 IN THE CASE OF OXYGEN IS -2
Which material gives the soil its high fertility? bedrock sand silt humus
Answer:
Humus
Explanation:
D
Humus gives the soil its high fertility. Therefore, the correct option is option D among all the given options.
What is soil?The living, porous media that has grown in the top layer of the Earth's crust is known as soil. As a source of nutrients and water, a filter for harmful wastes, a site for their breakdown, and a participant for the cycle of carbon and various other elements throughout the planet's ecosystem, soil is one of the main substrates of life on Earth.
It has changed as a result of weathering processes influenced by geographical, geologic, biological, and climatic factors. A practical understanding of soils as well as their management has also developed out of need since the development of crops and forests in the eighth millennium BCE. Humus gives the soil its high fertility.
Therefore, the correct option is option D.
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