Answer:79.904
Explanation:
It's right cause it's right
What is the number of moles in 4.00 g of magnesium oxide,MgO?
Answer: 0.1 mole MgO
Explanation: 1 mole of MgO is equal to its molar mass.
4.00 MgO x 1 mole MgO/ 40g MgO
= 0.1 mole MgO
How do scientist form hypothesis
Answer:
Explanation:
it needs to included an if,then statement.
NEED HELP ASAP!!!!!!
Heat is distributed through the atmosphere by winds
True
False
The geosphere includes only the rocks sitting on the surface of the planet.
True
False
A tropical storm is an example of what two spheres of the earth interacting?
A.atmosphere and hydrosphere
B.geosphere and cryosphere
C.biosphere and atmosphere
D.cryosphere and atmosphere
The biosphere includes all of the fish that are in the ocean. Even though the ocean is part of the hydroshere.
True
False
The atmosphere controls and distributes heat.
True
False
One way the geosphere could affect the atmosphere is?
A. The oceans evaporate
B. a rock falls off a cliff
C. rain runs down a mountain and into the river which eventually makes it's way to the ocean.
D. A volcano erupts and throws gas into the atmosphere.
Explanation:
(1)
True
The winds are significant in the distribution of heat across the globe. There are global air circulations around the world such as the Hadley and polar cells that take heat from the hotter regions to the cooler regions. This is driven by high and low-pressure systems on earth that are influenced by the sun. Cooler air masses move from the high-pressure system and displace the warm winds in the low-pressure systems. This helps in maintaining a heat balance on earth.
(2)
False
The geosphere not only includes all the rocks on the surface of the earth but also the whole of the lithosphere ( or crust), which also includes all the landforms on earth. All the rocks and minerals in the interior of the earth are also part of the geosphere, including the process – such as the convection currents of the mantle- that helps in the shaping of the earth's surface.
(3)
A.
In a storm, the heat from the hydrosphere which is transferred to the atmosphere via the heat of evaporation is what feeds the storm. Therefore these two spheres not only share distribution of heat energy but also water. When the storms dissipate the heat and its water from the clouds, the water flows back to the hydrosphere and the cycle continues.
(4)
True
The biosphere includes all the living and biotic components on earth. Therefore even the marine animals in the oceans are part of the biosphere. They are one aspect that signifies the interaction betwene the hydrosphere and the biosphere. These organisms draw oxygen, water and minerals from the hydrosphere which is important or life.
(5)
True
However, the atmosphere is not the only sphere that distributes heat across the globe. So does the hydrosphere. The ocean's currents are very significant with this regard just as are air currents, The warm surface currents from the equator distribute heat towards the poles while cooler deeper currents flow towards the equator from the poles – maintaining a heat balance on earth.
(6)
D.
When a volcano erupts, gases -like sulfur dioxide and carbon dioxide- and pyroclasts from deep in the earth rocks (geosphere) are spewed into the atmosphere. This is an example of how these two spheres of the earth interact.
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Human activities have affected more than ______percent of the Earth's surface
A. 35
B. 50
C. 60
D. 70
Answer: Human activities have affected more than D). 70 percent of the Earth's surface
Explanation:
Final answer:
Human activities have transformed over 50% of the Earth's surface, including significant land use changes and impacts on the climate due to emissions from burning fossil fuels.
Explanation:
Human activities have affected more than 50 percent of the Earth's surface. Humans have transformed a large portion of the Earth's land through the expansion of cropland and pasturelands, reduction of forest habitats, and acceleration in land conversion for agriculture and habitation. Human influence extends beyond the land to the oceans and atmosphere through practices like burning fossil fuels, which has contributed substantially to climate change.
how does sweating help us to keep our body cool ?
Answer:
Sweat gland release moisture on the skin, cooling and relaxing the skin
Explanation:
Sweat gets sunken into your skin so it won't evaporate much.
Sweat is mainly water with a little bit of salts.
Whenever sweat evaporates, it tends to cool down the skin.
Conclusion:
Your conclusion will include a summary of the lab results and an interpretation of the results. Please write in complete sentences.
1. Did your data support your hypothesis? Use evidence to explain.
2. Which material refracted the light rays the most: air, water, or glass?
3. Which material refracted the light rays the least: air, water, or glass?
4. How does density affect refraction?
5. Diamonds are a very dense material. Predict what would happen to the light ray if you projected it from air through a diamond.
6. Explain where you observe reflection, refraction, and absorption of light in your everyday activities.
1. Yes, the data supported my hypothesis.
2. Water refracted the light rays the most.
3. Air refracted the light rays the least.
4. Density affects refraction because the denser the material, the slower the speed of light in that material.
5. The light ray would be refracted very strongly.
6. Reflection, refraction, and absorption of light can be observed in mirrors, aquariums, and sunglasses.
Summary of lab results:
The light rays were refracted the most when they passed from air into water.The light rays were refracted the least when they passed from air into glass.The density of a material affects how much it refracts light. The denser the material, the more it refracts light.If a light ray is projected from air through a diamond, it will be refracted very strongly.Reflection, refraction, and absorption of light can be observed in many everyday activities. For example, when you look in a mirror, you are seeing a reflection of yourself. When you look at a fish in an aquarium, you are seeing the refraction of light as it passes from the water into the air. And when you wear sunglasses, you are absorbing some of the sunlight, which helps to protect your eyes.
Interpretation of the results:
The results of the lab supported my hypothesis that the denser the material, the more it would refract light. The light rays were refracted the most when they passed from air into water, which is the denser of the two materials. The light rays were refracted the least when they passed from air into glass, which is the least dense of the three materials.
The density of a material affects how much it refracts light because the denser the material, the slower the speed of light in that material. When light travels from a less dense material to a denser material, it slows down and bends towards the normal. When light travels from a denser material to a less dense material, it speeds up and bends away from the normal.
The results of this lab can be used to explain many everyday phenomena, such as why diamonds sparkle so much. Diamonds are very dense materials, so they refract light very strongly. This is why when you look at a diamond, you see a rainbow of colors.
Reflection, refraction, and absorption of light in everyday activities:
Reflection, refraction, and absorption of light are all around us in our everyday activities. Here are a few examples:
Reflection: When you look in a mirror, you are seeing a reflection of yourself. This is because the mirror reflects light back to your eyes.Refraction: When you look at a fish in an aquarium, you are seeing the refraction of light as it passes from the water into the air. This is why the fish appears to be in a different location than it actually is.Absorption: When you wear sunglasses, you are absorbing some of the sunlight. This helps to protect your eyes from the harmful effects of the sun's raysTo learn more about refraction, here
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Final answer:
In the lab investigation, glass refracted light the most, air the least, and density was found to significantly affect the degree of light refraction. A light ray passing through a diamond would exhibit a substantial amount of refraction due to the diamond's high density.
Explanation:
Conclusion: Interpretation of Lab Results
To conclude the investigation on refraction phenomena, it is essential to analyze the data collected and compare it to our initial hypothesis. When examining whether the data supported the hypothesis, it is crucial to reference specific evidence from the experiment. The hypothesis, in this case, may have been concerning the relationship between density and refraction of light through different materials.
Regarding which material refracted light rays the most, glass typically has a higher index of refraction compared to air and water, indicating that light rays bend more when passing through glass. Conversely, air refracted the light rays the least among the three because it has the lowest density and index of refraction.
Density is directly related to refraction; denser materials have higher indexes of refraction and therefore bend light to a greater degree. Given that diamonds are highly dense, a light ray projected from air through a diamond would undergo significant refraction, resulting in a high degree of bending.
In daily life, reflection can be observed in mirrors, refraction when looking at objects submerged in water, and absorption when objects do not reflect or transmit light visibly. Recalling these phenomena can aid in understanding their application and significance.
Balance C2 H602+02 reacts with CO2 + H2O
Answer:
Yeah
Explanation:
Mhm
Answer:
2 C2H6O2 + 5 O2 => 4 CO2 + 6H2O
Explanation: The chemical equation is now balanced.
After one half life, the ratio of parent atoms to daughter atoms in a sample is 1:2.
True or False
Answer:
FalseExplanation:
As we know that half life of any substance is constant. The ratio of parent to daughter atoms after one half life will be 1:1, then after the second half life further half of the first half will decay and will produce more daughter and reduce more parent and making the ratio 1:3, the ratio after 3rd half life will be 1:7, then 1:15 and so on.
Let's suppose that we are given with 100 g of radioactive substance and we are calculating the mass of parent and daughter atoms after every half life as;
1/2 life Mass of Parent Mass of Daughter Ratio
0 100 g 0 100:0
1 50 50 1:1
2 25 75 1:3
3 12.5 87.5 1:7
4 6.25 93.75 1:15
how many moles of H2SO4 are in 2.50 L of a 4.25 M aqueous solution
Answer:
Moles = 10.625 mol
Explanation:
Molarity is the amount of solute dissolved per unit volume of solution. It is expressed as,
Molarity = Moles / Volume of Solution ----- (1)
We can also rearrange this equation in terms of moles as,
Moles = Molarity × Volume of Solution ------(2)
Data Given;
Molarity = 4.25 mol.L⁻¹
Volume = 2.50 L
Now, putting value of Molarity and Volume in eq. 2,
Moles = 4.25 mol.L⁻¹ × 2.50 L
Moles = 10.625 mol
How many liters of carbon monoxide at STP are needed to react with 4.80 g of
oxygen gas to produce carbon dioxide?
2CO(g) + O2(g) → 2C02(g)
6.72 L of Carbon Monoxide (CO) is needed.
Explanation:
First from the mass of the oxygen in grams is converted into moles and then it is proportionate to the moles of CO and then it is converted into its Volume in litres ( L).
4.8 g of O₂ × 1 mol of O₂× 2 mol CO ×22.4 L CO / (32 g of O₂ × 1 mol of O₂ × 1 mol of CO) = 6.72 L CO
The volume of CO reacted with oxygen at STP has been 6.72 L.
The moles of reactant and product in a balanced chemical equation has been given by the stoichiometric coefficient.
The balanced chemical equation for the formation of carbon dioxide has been:
[tex]\rm 2\;CO\;+\;O_2\;\rightarrow\;2\;CO_2[/tex]
Computation for the volume of CO reactedThe balanced chemical equation has been giving the information of 2 moles of CO reacted with a mole of oxygen.
The available moles of oxygen in 4.80 g has been:
[tex]\rm Moles\;=\;\dfrac{Mass}{Molar\;mass}\\\\ Moles\;O_2=\dfrac{4.80}{32}\\\\ Moles\;O_2=0.15\;mol[/tex]
The available moles of oxygen has been 0.15 mol.
The moles of CO reacted has been given by the stoichiometric coefficient of the balanced equation as:
[tex]\rm 1\;mol\;O_2=2\;mol\;CO\\0.15\;mol\;O_2=0.30\;mol\;CO[/tex]
The moles of CO reacted has been 0.30 mol.
The volume of a mole of gas at STP has been 22.4 L. The volume of 0.30 mol CO has been:
[tex]\rm 1\;mol=22.4\;L\\\\0.30\;mol=\dfrac{22.4}{1}\;\times\;0.30\;L\\\\ 0.30\;mol=6.72\;L[/tex]
The volume of CO reacted with oxygen has been 6.72 L.
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Convert 100 degrees Celsius to Fahrenheit
Answer:
212 degrees Fahrenheit
Answer: 212 degrees Fahrenheit
What must be included when descubing the displacement of an object?
Direction
Explanation:
In describing the displacement of a body, the directional attribute must be included or added to it.
Displacement is a vector quantity.
It is a length of path taken from start to finish of the motion of a body.
Coupled with this, the direction of the travel must also be included.
For example, Sam traveled in from Alaska to Florida with a displacement of 1000km south-east.
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What madd of boron trifluoride can be made from 30.0g of fluorine
Mass of boron trifluoride is 35.768 g.
Firstly we need to write the balanced chemical equation involved in this question:
[tex]2B(s)+ 3F_2(g)[/tex] → [tex]2BF_3(g)[/tex]
It is given that:
Mass of fluorine= 30.0 g
So, we need to calculate moles of Fluorine
∵ Molar mass of fluorine= 38 g/mol
[tex]n= \frac{m}{M} = \frac{30.0g}{38 gmol^{-1}} = 0.789 mol[/tex]
Now, for 3 moles of F₂ ; 2 moles of BF₃ are produced.
So, for 0.789 moles of F₂, number of moles of BF₃ will be:
[tex]\frac{2}{3} *0.789=0.526 \text{mol}[/tex]
Moles of BF₃ =0.526 mol
∵ Molar mass of boron trifluoride =67.8 g/mol
Thus, mass of boron trifluoride can be calculated as:
[tex]m=n*M= 0.526*67.8=35.662 g[/tex]
⇒Mass of boron trifluoride is 35.768 g.
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Not among the offered possibilities as the closest option is 53.0 grams. Using the stoichiometry of the balanced chemical equation for the reaction between boron (B) and fluorine to make boron trifluoride, we can calculate the mass of boron trifluoride (BF₃) that can be produced from 30.0 grams of fluorine (F₂).
The chemical formula is B + 3 F₂ BF₃, which is balanced.
One mole of boron combines with three moles of fluorine to form one mole of boron trifluoride, as shown by the equation.
First, we must change the amount of fluorine from grams to moles: (30.0 grams F₂) / (38.00 grams/mole F₂) = 0.789 moles F₂.
According to the stoichiometry, 3 moles of fluorine are converted into 1 mole of boron trifluoride. As a result, the amount of BF₃ that was created is similarly 0.789 moles.
Finally, by utilizing its molar mass, we can determine the mass of BF₃:
53.49 grams BF₃ are equal to (0.789 moles BF₃) times (67.81 grams/mole BF₃).
As a result, 30.0 grams of fluorine may be used to produce around 53.49 grams of boron trifluoride.
The estimated number is not exactly matched by any of the available response options. The response would be: Not among the offered possibilities as the closest option is 53.0 grams.
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If angle ABE = 2n + 7 and angle EBF=4n-13,
find angle ABE.
Answer:
The measure of angle ABE is 27°.
Explanation:
Consider the below figure attached with this question.
Given information: ∠ABE=2n+7 and ∠EBF=4n-13.
From the below figure it is clear that ∠ABE and ∠EBF are congruent.
[tex]m\angle ABE=m\angle EBF[/tex]
[tex]2n+7=4n-13[/tex]
Isolate variable terms on one side.
[tex]7+13=4n-2n[/tex]
[tex]20=2n[/tex]
Divide both sides by 2.
[tex]10=n[/tex]
The value of n is 10.
We need to find the measure of ∠ABE.
[tex]\angle ABE=2(10)+7=20+7=27[/tex]
Therefore, the measure of angle ABE is 27°.
The measure of angle ABE is 27°.
Since the angles are congruent, therefore, ∠ABE=2n+7 and ∠EBF = 4n-13 will be equated to each other.
This will be;
2n+7 = 4n-13
Collect like terms
4n-2n = 7+13
2n = 20
Divide both sides by 2.
2n/2 = 20/2
n = 10
Therefore, the value of n is 10.
Since angle ABE = 2n + 7
ABE = 2[10] + 7
= 20 + 7 = 27°.
Therefore, the measure of angle ABE is 27°
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Find the mass . 2.40 mol NaOH
Answer:
Explanation:
5.6 mol
Answer: 96g
Explanation:
To find the mass of 2.40mol of NaOH, we must first obtain the molar mass of NaOH. This is illustrated below:
Molar Mass of NaOH = 23 + 16 + 1 = 40g/mol
From the question, we were asked to find the mass of 2.4moles of NaOH. This is done by the formula:
Mass = number of mole x molar Mass
Mass of NaOH = 2.4 x 40
Mass of NaOH = 96g
the standard boiling point of an ideal solution of a given composition is a constant or not?
Answer:
The standard boiling point of an ideal solution is 100 degree celsius for a given composition. Mostly all given solution of a given composition is a constant (boiling point 100 degrees) but not all composition is constant.
Explanation:
Answer:
the standard boiling point of an ideal solution of a given composition is constant. The normal boiling point of an ideal solution such as water is 99.97 °C (211.9 °F) at a pressure of 1 atm (i.e., 101.325 kPa).
Explanation:
1qt=0.95L, how many quarts are in a 2liter bottle
Answer: 2.1 qt
Explanation: solution:
2L x 1 qt / 0.95 L = 2.1 qt
What is the motion of earth’s plates like?
A. Fast and in stages
B. Slow and in stages
C. Fast and constant
D. Slow and constant
The motion of Earth's plates are like slow and constant. The correct option is D.
What are Earth's plates?
Tectonic plates are massive chunks of the Earth's crust and upper mantle. They are composed of oceanic and continental crust.
Earthquakes occur near mid-ocean ridges and large faults that mark the plate boundaries.
The hot magma flows in convection currents due to tremendous heat and pressure within the earth. These currents usually result the tectonic plates that make up the earth's crust to move.
The Earth's tectonic plates are constantly shifting. Heat within the Earth drives their movement.
Hot material within the Earth rises as a result, until it reaches the surface, where it moves sideways, cools, and sinks. Convection is the name given to this circular motion.
Thus, the correct option is D.
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What is the force of gravity acting on an object?
Velocity
Mass
Weight
Pounds
Answer:
The answer is Weight. The person who said mass is incorrect.
Explanation: Took the test and got it right
Answer:
Weight
Explanation:
It's weight cause it literally only makes sense no other answer would make sense.
Which carbon skeleton represents a ketone?
Yo sup??
The correct answer is option C
the rest are aldehyde, carboxylic acid and ether respectively.
Hope this helps.
What is the potential energy of the ball as it is half way through the fall, 20 meters high?
[tex]98 \times mass \text { joule }[/tex] is the potential energy of the ball as it is half way through the fall, 20 meters high
Explanation:
Given data:
Height of the fall = 20 m
Given that the body is half-way through the fall, it is at above the ground 10 m
[tex]\frac{1}{2} \times 20=10 \mathrm{m}[/tex]
We need to find its potential energy (P.E)
Energy due to the body’s position is referred as potential energy. It means the energy when body is at rest. It can be expressed as below,
[tex]\text { Potential energy }=m \times g \times h[/tex]
Where
m – The body’s mass
g - Acceleration due to gravity [tex]\left(9.8 m / s^{2}\right)[/tex]
h - Height of the body
By substituting the given values, we get
[tex]Potential energy =m \times 9.8 \times 10=98 \times m\ joule[/tex]
Since the mass is not provided, just kept it.
Answer: 98 x m
Explanation:
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The biosphere includes all of the fish that are in the ocean. Even though the ocean is part of the hydroshere.
True
False
Answer:
False
Explanation:
The biosphere includes all living organisms on Earth, which certainly includes fish in the ocean. However, the ocean is part of the hydrosphere, which is one of the Earth's spheres that encompasses all of its water, including oceans, lakes, rivers, and other bodies of water. So, the biosphere and hydrosphere are interconnected, but they are not the same thing.
16g of O2
14g of N2
8g of CH4
1g of H2
Assuming ideal conditions, which statement is true of these samples of gases?
A) They are listed in order of decreasing number of moles.
B) They are listed in order of increasing number of particles.
C) They all have the same volume at the same temperature and pressure.
D) They all have the same density at the same temperature and pressure.
Answer:
C) They all have the same volume at the same temperature and pressure.
Explanation:
the answer on top of mine is wrong
All of these molecules have 0.5 number of moles. According to Avogadro's law, equal number of moles of gases contains equal volume at STP. Hence, option C is correct.
What is STP condition ?The condition of standard pressure and temperature is called STP. The temperature of 298 K and a pressure of 1 atm is called standard condition.
At STP the volume of one mole of every substance is 22.4 L.
Molecular mass of O₂ = 32 g/mol
molecular mass of N₂ = 28 g/mol
molar mass of CH₄ = 16 g/mol and
molecular mass of H₂ = 2 g/mol.
The given masses of each of these gases are half of their molar mass. Hence, they are all 0.5 moles. According to Avogadro's law, equal number of moles of different gases have the same volume at STP. Hence, option C is correct.
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If a gas is cooled from 425.0K to 275.15K and the volume is kept constant what final pressure would result if the original pressure was 770.0 mm Hg?
Answer: 498.51mmHg
Explanation:
First let us analyse what was given from the question:
T1 = 425K
T2 = 275.15K
P1 = 770 mmHg
P2 =?
Using the general gas equation
P1V1/T1 = P2V2/T2
But we were told from the question that the volume is constant. So, our equation becomes:
P1/T1 = P2/T2
770/425 = P2 /275.15
Cross multiply to express in linear form:
P2 x 425 = 770 x 275.15
Divide both side by 425, we have:
P2 = (770 x 275.15) /425
P2 = 498.51mmHg
How many Cobalt atoms do you need to have 1245 milligrams of cobalt?
No. of atoms included in 1245 mg is 0.127 *[tex]10^{23}[/tex] atoms.
Answer:
Explanation:
We know that we can determine the number of atoms in any given amount of sample by dividing the given weight to the atomic mass of the particular sample and then multiplying it with avagadro's number.
So, here the atomic mass of cobalt is 58.9 amu.
Thus,
No.of atoms = [tex]\frac{1245 mg}{58.9g} * 6.023 * 10^{23}[/tex]
No. of atoms included in 1245 mg is 0.127 *[tex]10^{23}[/tex] atoms.
As we know that atomic mass of any element contains avagadro's number of atoms. So in order to find the number of atoms in a given weight of sample, we have to follow the above procedure.
No. of atoms included in 1245 mg is 0.127 *[tex]10^{23}[/tex] atoms.
if a car travels 400m in 20 how fast is it going
Which of the following is most likely to be a conductor
Answer:
A compound containing metallic bonds.
Explanation:
Metals are the best conductors of electricity due to their free-moving electrons, with silver and copper being among the most effective. Copper is widely used for electrical wiring, while silver's use is limited by its cost. Gold is also a good conductor, used where high conductivity is necessary.
The substance most likely to be a conductor is typically a metal because metals have free electrons that can easily move and carry electric current. Among the best conductors of electricity are silver, copper, gold, and aluminum, which are also excellent thermal conductors.
Copper is commonly used in electrical wires due to its high electrical conductivity and cost-effectiveness. However, the best electrical conductor is actually silver; its usage is limited by its high cost. Gold is also used for its high conductivity, especially when high conductivity is required, such as in high-quality audio cables or in electronic connectors that are subjected to heavy wear.
In the case of cooking utensils, they are typically made from good conductors like these metals to efficiently transfer heat. These conductors work well because they have a high density of free electrons that are available to carry the electric charge, resulting in low resistivity. Conversely, insulators have a high resistivity and semiconductors have an intermediate resistivity, with their conductivity varying depending on impurities and other factors.
Map of the United notes. Three circles centered at Portland, Salt Lake City, and Los Angeles. The circles converge at San Francisco.
Based on the seismograph measurements in the
Answer:
length tunes height over virtual distance
Answer:
san francisco
Explanation:
its correct i promise <3
Oxygen is a diatomic gas. How many oxygen molecules are in 16 grams of oxygen?
A) 0.5 molecules
B) 1.20 x 1024 molecules
C) 3.01 x 1023 molecules
D) 6.02 x 1023 molecules
Answer:
3.011 × 10²³ O₂ Molecules
Explanation:
Data Given:
Mass of O₂ = 16.0 g
M.Mass of O₂ = 32.0 g.mol⁻¹
Step 1: Calculate Moles of O₂ as,
Moles = Mass ÷ M.Mass
Putting values,
Moles = 16.0g ÷ 32.0 g.mol⁻¹
Moles = 0.50 mol of O₂
Step 2: Calculate number of Carbon atoms,
As 1 mole of any substance contains 6.022 × 10²³ particles (Avogadro's Number) then the relation for Moles and Number of Oxygen Molecules can be written as,
Moles = Number of O₂ Molecules ÷ 6.022 × 10²³ Molecules.mol⁻¹
Solving for Number of C atoms,
Number of O₂ Molecules = Moles × 6.022 × 10²³ Molecules.mol⁻¹
Putting value of moles,
Number of O₂ Molecules = 0.50 mol × 6.022 × 10²³ Molecules.mol⁻¹
Number of O₂ Molecules = 3.011 × 10²³ O₂ Molecules
What are the two main sources of energy in the water cycle?
gravitational energy and thermal energy
kinetic energy and thermal energy
gravitational energy and mechanical energy
hydro energy and gravitational energy
Answer:
Gravitational energy and thermal energy
Explanation:
A water cycle is a product of gravitational energy from the earth and thermal energy from the sun.
A water cycle is driven around with the help of hydroelectric energy. Now hydroelectric energy is a product of potential energy that is converted into kinetic energy, with the help of gravitational energy, which again is also acquired from thermal energy from the sun.
Therefore, the correct answer is gravitational energy and thermal energy.