A sphere is perfectly symmetrical and it is not a polyhedron. A sphere has a constant width and circumference. The volume of the sphere with a diameter of 4cm is 33.40 cm³. The correct option is B.
What is volume of a sphere?The amount of space occupied by the three dimensional object is defined as the volume of the sphere. A sphere is defined by three axes namely x-axis, y-axis and z-axis. It has no flat face but a curved face.
The equation used to calculate the volume of sphere is:
Volume = 4/3 πr³
Diameter = 4cm
radius = 2cm
Then the volume is:
Volume = 4/3 × 3.14 × (2)³
Volume = 33.40 cm³
Thus the correct option is B.
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Your question is incomplete most probably your full question was:
The diameter of a sphere is 4 centimeters. Which represents the volume of the sphere?
A. 321 cm³
B. 33.40 cm³
C. 541 cm³
D. 167 cm³
Which influences both chemical weathering and mechanical weathering?
Answer:
wind i think
Explanation:
Answer:
Hello! Your answer is Plants.
Which of the following equations is balanced?
A. Na2SO4(aq) + CaCl2(aq) -> CaSO4(s) + NaCl(aq)
B. Na2SO4(aq) + CaCl2(aq) -> CaSO4(s) + 2NaCl(aq)
C. 2Na2SO4(aq) + CaCl2(aq) -> CaSO4(s) + 2NaCl(aq)
D. Na2SO4(aq) + 2CaCl2(aq) -> CaSO4(s) +NaCl(aq)
answer is B
because both sides have equal numbers of atomos
A container holds 22.4 L of gas at 1.00 atm and 0.0˚C.
a. Convert 0.0˚C to Kelvin.
b. State the combined gas law.
c. If the pressure increases to 1.50 atm and the temperature doesn’t change,
calculate the new volume.
d. If the temperature increases to 100.0 ˚C and the pressure doesn’t change,
calculate the new volume.
Answer:
Explanation:
Parameter given:
Volume of gas in the container = 22.4L
Pressure on the gas = 1.0atm
Temperature of the gas = 0.0°C
Problem 1
Coverting 0.0°C to Kelvin:
In order to convert 0.0°C to Kelvin, we apply the formula:
K = T(°C) + 273
Where T is the temperature in °C and K is the unknown temperature in Kelvin:
K = 0.0 + 273 = 273K
Problem 2
The combined gas law is also known as the general gas law. It is expressed as:
[tex]\frac{P_{1}V_{1} }{T_{1} } = \frac{P_{2}V_{2} }{T_{2} }[/tex]
The expression combines both Boyle's law and Charle's Law.
Problem 3
Parameters given:
Volume of gas in the container V₁ = 22.4L
Pressure on the gas P₁ = 1.0atm
Temperature = 273K
P₂ = 1.50atm
Unknown: The final volume, V₂ = ?
Solution
From the given problem, we know that the temperature is constant. We apply Boyle's law. Boyle's law states that "The volume of a fixed mass of gas varies inversely a the pressure changes if the temperature is constant".
It is expressed as P₁V₁ = P₂V₂
The unknown parameter is V₂, we make it the subject of the expression:
V₂ =[tex]\frac{P_{1}V_{1} }{P_{2} }[/tex]
V₂ = [tex]\frac{1 x 22.4}{1.5}[/tex]
V₂ = 15L
Problem 4
The unknown here is the new volume V₂ at constant pressure.
Given parameters:
Volume of gas in the container V₁ = 22.4L
Pressure on the gas P is constant
Intial Temperature T₁ = 273K
Final Temperature T₂ = 100°C , converting to K gives, K = 100 + 273 = 373K
From the given parameters, the unknown and the conditions guiding the equation, we apply Charle's law. Charle's law states that "The volume of a fixed mass of gas is directly proportional to its absolute temperature provided pressure is constant".
it is expressed as: [tex]\frac{V_{1} }{T_{1} } = \frac{V_{2} }{T_{2} }[/tex]
We then express the unknown V₂ as the subject of the formula:
V₂ = [tex]\frac{V_{1} T_{2} }{T_{1} }[/tex]
V₂ = [tex]\frac{22.4 x 373}{273}[/tex]
V₂ = 30.6L
What does the yellow star in the picture represent
Answer:add the picture and i can tell you
Which is the second step in the dissolving process?
Answer:
The second step would be for formation of solute-solvent intermolecular bonds. Forming bonds always releases energy this would be an exothermic process
Explanation:
Answer:
There are three steps in solvation: the breaking of bonds between solute molecules, the breaking of intermolecular attractions between solvent molecules, and the formation of new solute-solvent attractive bonds. Energy is absorbed during the first two steps, and it is released during the last step.
Hope that Helps!!!
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If a sample has 25% parent and 75% daughter, how many halflifes have gone by?
Answer:
Two half lives.
Explanation:
It is known that the decay of isotopes and radioactive material obeys first order kinetics.
Also, it is clear that in first order decay the half-life time is independent of the initial concentration.
That means for a sample 100% to decay to 50 % it will take one half-life, and to decay the remaining 50% to 25% it will take another half-life.
So, for a sample has 25% parent and 75% daughter it will have two half-lives.
A hot metal plate at 150°C has been placed in air at room temperature. Which event would most likely take place over the next few minutes?
Molecules in both the metal and the surrounding air will start moving at lower speeds.
Molecules in both the metal and the surrounding air will start moving at higher speeds.
The air molecules that are surrounding the metal will slow down, and the molecules in the metal will speed up.
The air molecules that are surrounding the metal will speed up, and the molecules in the metal will slow dow
the air molocules that are surrounding the metal will speed up, and the molocules in the metal will slow down, because as the metal cools the molocules will cool which would make them slow down, but then it would heat the surrounding air and make those molocules speed up.
Answer:
D. The air molecules that are surrounding the metal will speed up, and the molecules in the metal will slow down.
Explanation:
How many atoms total are present in one molecule of 5-methyl-2 hexanol C7H16O
Answer:
24 atoms
Explanation:
The formula of the compound is C₇H₁₆O
The number of atoms that makes up one molecule of this compound are:
7 carbon atoms
16 hydrogen atoms
1 oxygen atom
The total number of atoms = 7+16+1 = 24 atoms
A 14.0 mL sample of acetic acid requires 28.23 mL of a 0.521 M solution of NaOH for titration to the equivalence point. What is the concentration of the acetic acid?
Answer:
Concentration of the acid = 1.05M
Explanation:
Given parameters:
Volume of acid = 14.0mL = 0.014L
Volume of base = 28.23mL = 0.02823L
Concentration of the base = 0.521M
Unkown:
Concentration of acid = ?
The reaction equation is given below:
CH₃COOH + NaOH → CH₃COONa + H₂O
To obtain the unknown concentration of the acid used in the reaction, we simply work from the known parameters of the given base.
Procedure:
Find the number of moles of the base used in the reaction using the equation below:Number of moles of base = concentration of base x volume
Number of moles of base = 0.521 x 0.02823 = 0.0147mol
From the balanced reaction equation, we know that:1mole of the base neutralize on mole of acid,
Therefore, 0.0147mol of the acid would be neutralized by the base.
To find the concentration of the acetic acid,
Concentration of acid = [tex]\frac{Number of moles of acid}{Volume of acid}[/tex]
Concentration of acid = [tex]\frac{0.0147}{0.014}[/tex]
Concentration of the acid = 1.05M
Answer: 1.05M
Explanation: took usatestprep test
calculate the energy needed to change 12g of ice at -20°C to liquid water at 0°C.
Answer:
504 J.
Explanation:
To solve this problem, we can use the relation:Q = m.c.ΔT,
where, Q is the amount of heat absorbed by ice (Q = ??? J).
m is the mass of the ice (m = 12.0 g).
c is the specific heat of the ice (c of steam = 2.1 J/g.°C).
ΔT is the difference between the initial and final temperature (ΔT = final T - initial T = 0.0°C - (-20.0°C) = 20.0°C).
∴ Q = m.c.ΔT = (12.0 g)(2.1 J/g.°C)(20.0°C) = 504 J.
An element has atomic number 10 and an atomic mass of 20. How many neutrons are in the atom of this element?
A.
10
B.
20
C.
30
D.
0
E.
200
The answer is A. 10.
Answer:
10
Explanation:
Which of the following is NOT an indicator of a chemical change? color change change in volume temperature changes gas formation
Answer:
change in volume
Explanation:
Chemical change is a type of change in which new substances are formed. There are various signs that indicate the occurence of a chemical change.
They include;
Color change Formation of a precipitateFormation of a gas or bubblesOdor change Change in temperatureTherefore, in this case, change in volume is not an indicator that a chemical change has occurred.
Answer:
Change in Volume
Explanation:
Got it right on Odessyware ;) Have a Nice Day!!!!!
Potassium has an atomic number of 19 it often forms and ion by losing 1 electron how many electrons would the ion have
Answer: 18
Explanation:
Since there are 19 protons and 19 electrons, by losing one electron, potassium would then have 18 electrons. Hope this helps!
What is the molarity of a solution containing 6.0 moles of solute in 549 mL of solution?
a. 11 M
b. 92 M
c. 3.3 M
d. 0.092 M
b because of the solution
The answer is B. Hope that helps!
The __ is the only vein in the body that carries oxygen-rich blood.
Answer:
pulmonary vein
Explanation:
The pulmonary vein is the only vein in the body that carries oxygen rich blood.
A balloon that had a volume of 3.50 L at 25.0°C is placed in a hot room at 40.0°C. If the pressure remains constant at 1.00 atm, what is the new volume of the balloon in the hot room?
Answer:
3.676 L.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant,
T is the temperature of the gas in K.
If n and P are constant, and have different values of V and T:(V₁T₂) = (V₂T₁)
Knowing that:
V₁ = 3.5 L, T₁ = 25°C + 273 = 298 K,
V₂ = ??? L, T₂ = 40°C + 273 = 313 K,
Applying in the above equation(V₁T₂) = (V₂T₁)
∴ V₂ = (V₁T₂)/(T₁) = (3.5 L)(313 K)/(298 K) = 3.676 L.
Answer:
3.68 on edge
Explanation:
What is a goal of the planned mission MIRI?
B
A. to land on the moon
B. to explore the Kupier Belt
C. to explore the moon of Jupiter
D. to examine asteroids near Mars
Answer:
The answer is B. to explore the Kupier Belt
Answer:
The correct answer is option B, that is, to explore the Kupier belt.
Explanation:
The MIRI or the Mid-Infrared Instrument possesses both a spectrograph and a camera, which observes light in the mid-infrared region of the electromagnetic spectrum, exhibiting the longer wavelengths that are generally not seen with the naked eyes.
The MIRI encompasses the range of wavelength in between 5 to 28 microns. The sensitive detectors present in them permits to observe the newly developing stars, the redshifted light of far-off galaxies, and faintly visible comets and the objects present in the Kupier belt.
If you wanted to look at a cell wall.Which type of cell wall would you observe?
If you are trying to observe a cell wall, you should look at a plant cell. There are only two different types of cells, which are plant and animal cells. The plant cell is the only one which contains a cell wall. Animal cells actually only have a cell membrane.
Cell walls, commonly found in plant or bacterial cells, have distinct structures based on the type of organism. Plant cell walls consist of cellulose, providing rigidity and structure, while bacterial cell walls contain peptidoglycan for protection and shape. Unlike these, animal cells do not have a cell wall.
Explanation:If you wanted to look at a cell wall, the most common types you would observe would be those of plants or bacteria, as they are widely studied in biology. Plant cell walls are primarily made up of cellulose, giving them rigid structure for support, whereas bacterial cell walls are mainly composed of peptidoglycan, which provides protection against environmental stressors.
When observing a plant cell wall under a microscope, what you are seeing is a rigid layer outside the cell membrane that provides structure and support. For bacteria, the cell wall is a protective layer outside the cell membrane, which protects the bacterium and gives it shape.
In contrast, animal cells do not have a cell wall, but a cell membrane instead, which provides a flexible structure. It's essential to remember that cell walls vary significantly in composition and structure among different groups of organisms.
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how can you change the rate of solubility in solute
Raising the temperature and change the pressure.
Which one of the following statements is correct?
Cells form tissue, and systems form organs
Cells form systems, and systems form organs
Tissues form organs, and organs form systems
Cells form organs, and organs form tissues
Answer:
Tissues form organs, and organs form systems. Hope this helped!
Explanation:
Does anyone know what ionic and covalent bonds are and how do u draw them or work out how many electrons to put in the shells depending on which element it is?
Answer:
Ionic bonds are made by a transfer of electrons. Covalent bonds are made by sharing electrons.
Explanation:
For ionic bonds, use the group number to help you determine how many electrons an element can give or receive (Group 1 gives 1 electrons, group 2 gives 2 electrons, group 3A gives 3, group 5A receives 3, group 6A receives 2, and group 7A receives 1).
Covalent bonds have to be worked out using the total number of valence electrons and the octet rule.
1 name the kind of rock that needs heat and pressure to form
2 what are the two types of igneous rock?
3 what are three things that erode rocks?
4 name 3 examples of mechanical weathering.
5 what is plucking?
6 what is rust?
7 what is acid rain?
8magma cools___ly.
9 lava cool___ly.
10 when minerals crystallize from water solutions,the narrow channels form_____.
11 hot water dissolves____and when the water cools_____form.
12 name a mineral that is left behind by evaporation.
13 particles in a mineral in a repeating pattern.
THANKS IF YOU CAN HELP ME!
1. Metamorphic rocks form from heat and pressure changing the original or parent rock into a completely new rock.
2.There are two basic types.
Intrusive igneous rocks crystallize below Earth's surface, and the slow cooling that occurs there allows large crystals to form.
Extrusive igneous rocks erupt onto the surface, where they cool quickly to form small crystals. Some cool so quickly that they form an amorphous glass.
3. Erosion is the wearing away of the land by forces such as water, wind, and ice. Erosion has helped to form many interesting features of the Earth's surface including mountain peaks, valleys, and coastlines. There are many different forces in nature that cause erosion.
4. • Frost and Salt Wedging. One of the more common forms of mechanical weathering is frost wedging. ...
• Unloading and Exfoliation. ...
• Water and Wind Abrasion. ...
5. Plucking, also referred to as quarrying, is a glacial phenomenon that is responsible for the erosion and transportation of individual pieces of bedrock, especially large "joint blocks". This occurs in a type of glacier called a "valley glacier".
6. Rusting, a well known example of corrosion, is the breakdown of the metal iron. The reactants of this chemical reaction are iron, water, and oxygen, and the product is hydrated iron oxide, better known as rust. Rust, unlike iron, is crumbly, orange, and pretty much useless for building things.
7. rainfall made sufficiently acidic by atmospheric pollution that it causes environmental harm, typically to forests and lakes. The main cause is the industrial burning of coal and other fossil fuels, the waste gases from which contain sulfur and nitrogen oxides, which combine with atmospheric water to form acids.
8. Magma that cools quickly forms one kind of igneous rock, and magma that cools slowly ...
9. When magma rises from deep within the earth and explodes out of a volcano, it is called lava, and it cools quickly on the surface. Rock formed in this way is called extrusive igneous rock.
10. When water becomes saturated with dissolved minerals, particles can crystallize out of the water and form minerals. Chemical rocks form when minerals crystallize directly from water.
11. Sugar dissolves faster in hot water than it does in cold water because hot water has more energy than cold water. When water is heated, the molecules gain energy and, thus, move faster.
12. Gypsum and halite
13. the repeating pattern of a mineral's particles forms a solid called a crystal. A crystal has flat sides, called faces, that meet at sharp edges and corners. a mineral has a definite chemical composition or range of compositions.
I hope this is what you’re looking for if not I’m very sorry :/
The formation of rocks, types of weathering, and characteristics of minerals are explained in detail. For instance, metamorphic rocks are formed by heat and pressure, igneous rocks are divided into intrusive and extrusive, and mechanical weathering includes processes such as frost wedging and thermal expansion.
Explanation:1. Metamorphic rock needs heat and pressure to form.
2. The two types of igneous rock are intrusive (plutonic) and extrusive (volcanic).
3. Water, wind, and ice are three things that erode rocks.
4. Three examples of mechanical weathering include frost wedging, thermal expansion, and abrasion.
5. Plucking is when a glacier picks up rocks in the lower side.
6. Rust is an iron oxide (a type of corrosion) that forms in the presence of oxygen and moisture.
7. Acid rain is precipitation that contains higher than normal amounts of sulfuric or nitric acids. It's typically from pollutant gases in the atmosphere.
8. Magma cools slowly below the Earth’s surface.
9. Lava cools quickly on the Earth’s surface.
10. When minerals crystallize from water solutions, the narrow channels form veins.
11. When the hot water cools crystals form.
12. Halite, a mineral form of salt, is often left behind by evaporation.
13. The repeating pattern in a mineral is called its crystal lattice.
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What does water pollution cause? Water pollution ------- causing has a prominent harmful effect on aquatic environments.
Answer:
maybe....Oxygen depletion ?
Explanation:
Answer:
Water pollution causing eutrophication has a prominent harmful effect on aquatic environments.
Explanation:
Water pollution causing eutrophication is a prominent harmful effect on aquatic environments. Eutrophication is the excessive presence of chemical nutrients in a water body. This is right.
How many milliliters of a 1.25 molar hydrochloric acid (HCl) solution would be needed to react completely with 60.0 grams of calcium metal? (2 points)
Ca (s) + 2HCl (aq)yields CaCl2 (aq) + H2 (g)
Answer:
2400 mL
Explanation:
[tex]Ca + 2HCl \implies CaCl_2 + H_2[/tex]
According to this equation, the stoichiometric ratio between [tex]Ca[/tex] and [tex]HCl[/tex] for the complete reaction is 1:2.
We know that the number of moles of [tex]Ca[/tex] can be calculated using the mole formula. (number of moles = mass / molar mass)
Moles of Calcium = [tex]\frac{60}{40}[/tex] = 1.5 mol
So the moles of [tex]HCl[/tex] = [tex]1.5 \times 2[/tex] = 3.0 mol
Volume of HCl solution = Moles of HCl/ concentration of HCl
Volume of HCl solution = [tex]\frac{3}{1.25}[/tex] = 2400 mL
The study of the quantitative relationship between the amount of reactions used and the amounts of products formed by ta chemical reaction is called stoichiometry true or false
The answer is true
Sorry if I'm wrong; please answer my last question I don't have much time; thank you
The statement is true. Stoichiometry is indeed the study of the quantitative relationship between the amounts of reactants used and products formed in a chemical reaction. It utilizes the coefficients from the balanced chemical equation to understand these relationships.
Explanation:The statement is true. The study of the quantitative relationship between the amount of reactants used and the amounts of products formed by a chemical reaction is indeed called stoichiometry. This concept underlies the understanding of the classification of the reaction.
Chemical stoichiometry describes the quantitative relationships between reactants and products in chemical reactions. Coefficients from the balanced chemical equation provide the relative numbers of these chemical species, thus allowing a quantitative assessment of the relationships between the amounts of substances consumed and produced by the reaction.
For example, when calculating the amount of product generated from a given amount of reactant, any other reactants required are assumed to be available in stoichiometric amounts (or greater). These coefficients are used to derive stoichiometric factors that subsequently may be used for computations relating reactant and product masses, molar amounts, and other quantitative properties.
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what are magic number
Something that is invisible that you can not see.
What are the magic numbers?
The magic numbers are 3, 6, and 9.
Can someone help me .
Answer:
Q6. scientists can monitor volcanoes to estimate when they are likely to erupt. Scientists can use a variety of techniques to do this, such as: seismometers - used to measure earthquakes occurring near an eruption. tiltmeters and GPS satellites – these devices monitor any changes in landscape. These signs may include very small earthquakes beneath the volcano, slight inflation, or swelling, of the volcano and increased emission of heat and gas from vents on the volcano,
Q7 They may need to move or they may need to evacute because when a volcano erupts it kills people and animals and burns every thing in its way. one way a volcano can kill someone is the thick ash clouds which make it hard to see and survive through.
Explanation:
The diagonals of a rhombus are 6 and 8. The area of the rhombus is 20 24 48
Answer:
= 24 square units
Explanation:
The area of a rhombus is given by the formula;
Area = pq/2
Where p and q are the diagonals of the rhombus.
In this case; p = 6 and q = 8
Therefore;
Area = (6×8)/2
= 24 square units
Answer:
B
Explanation:
How does the amount of light affect the growth of plants?Do all plant need the same amount of light
Answer:
Light is used by plants in a complex system that uses the light and several other resources to produce food. The more food= the more the plant grows, but too much food can be unhealthy for the plant. Some plants require more energy and others require less, this is because of the environment that they are in.
Explanation:
Plants' growth is significantly impacted by the quantity and quality of light they receive, a process called photomorphogenesis. Not all plants require identical light conditions, which is referred to as photoperiodism. Moreover, the ability of plants to use a variety of light wavelengths for photosynthesis allows them to adapt to different light conditions.
Explanation:The amount of light can significantly impact the growth of plants. Different kinds of lights can foster varying developmental responses in the plants. This is known as Photomorphogenesis, growth and development of plants in response to light. Light influences many functions in a plant beyond photosynthesis, like the timing of flowering, the determination of whether the plant will produce fruit or seeds, and the plant's size.
Also, not all plants require the same amount of light for growth, nodding towards the concept of Photoperiodism. Some plants may flourish best under less-intensive light or might need different types of light to germinate or flower. For instance, fluorescent (cool white) light, high in blue wavelengths, encourages leafy growth. On the other hand, Incandescent lamps promote flowering in some plants due to high richness in red light.
Photosynthetic organisms, like plants, have a mixture of pigments that absorb energy from a wide range of wavelengths. This ability is especially useful for plants growing in competition for light, underwater, or on the rainforest floor because they have limited access to sunlight.
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3. Calculate the percent yield of silver chromate if 0.455 grams of silver chromate are produced
from 0.500 grams of silver nitrate.
2 AgNO3 + K2CrO4 -> Ag2 CrO 4 + 2 KNO3
The answer is in the photo.