If the engines in both airplanes are at the same weight, the engines in both airplanes would still have the same mass because mass is constant everywhere.
What is mass?Mass can be experimentally defined as a measure of the body's inertia, meaning the resistance to acceleration (change of velocity) when a net force is applied.
In the question, the same type of engine is placed in two different air-planes of which the first airplane is twice as heavy as the second.
We can then conclude that the correct statement about the mass of the airplane and its acceleration, assuming a constant net force is that Increasing the acceleration of the air-plane causes the engine to provide more force.
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An infant acetaminophen suspension contains 80.0mg/0.80 mL suspension. The recommended dose is 15 mg/kg body weight. (1.000 lb. is equivalent to 453.59 g; this is a measured equality.)
How many mL of this suspension should be given to an infant weighing 17 lb ? (Assume two significant figures.)
Express your answer using two significant figures.
The amount, in mL, of the suspension that should be given to an infant weighing 17 lb will be 1.16 mL
Dimensional analysis0.8 mL of the liquid contains 80.0 mg of the drug.
The recommended dose is 15 mg per kg of body weight
The infant to be given the drug weighs 17 lb.
First, let's convert the weight of the infant to kg.
1 lb = 453.59 g
17 lb = 453.59 x 17/1
= 7711.03 g
1000 g = 1 kg
7711.03 g = 7711.03 x 1/1000
= 7.711 kg
So, the baby's weight is 7.711 kg.
The drug dose for the baby can thus be calculated as:
15 mg x 7.711 = 115.67 mg
But 0.8 mL of the drug contains only 80.0 mg. How many mL will contain 115.67 mg?
0.8 x 115.67/ 80.0 = 1.16 mL
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which statement concerning the oxygen level in the lake can be inferred from the graphs. 1) the increase of the sewage waste from 1950 to 1970 was due to decreasing human population. 2) the decreasing and sewage Way shows the environmental problems associated with the lamb population have been solved. 3) sewage waste is a good source of nutrients for most of fish.4) increases in sewage ways were responsible for decreasing oxygen levels in the lake
Increases in sewage waste were responsible for decreasing oxygen levels in the lake
Humans does have the impact on the environment in several ways. Common effects includes lowered water quality, elevated pollution and greenhouse gas emissions, depletion of natural resources and contribution to global climate change.
As global temperatures increasing , weather patterns on earth will dangererously change. While some areas will have longer growing seasons, others will become drought wastelands as water will decrease in vast areas, turning once floral regions into deserts. The elevation will impact weather patterns, provoking more intense hurricanes in both size and frequency, as well as intensifying and prolonging droughts and heat waves. But air pollution not only just effect the environment . The evidence is increasing that poor air quality and rising temperatures are ruining delicate ecosystems, even led to increased asthma and cancer rates in humans.
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How many moles (of molecules or formula units) are in each sample?
Express your answer in moles to three significant figures.
1) 18.0 g NO2
2) 1.35 kg CO2
3) 46.1 g KNO3
4) 191.8 kg Na2SO4
The number of moles in each sample will be 0.391 moles, 30.7 moles, 0.456 moles, and 1350 moles
What is the number of moles?The number of moles of a substance is the ratio of the mass of the substance to the molar mass.
In other words; mole = mass/molar mass.
Thus:
moles of 18.0 g [tex]NO_2[/tex] = 18.0/46= 0.391 moles
moles of 1.35 kg [tex]CO_2[/tex] = 1350/44= 30.7 moles
moles of 46.1 g [tex]KNO_3[/tex] = 46.1/101.1= 0.456 moles
moles of 191.8 kg [tex]Na_2SO_4[/tex] = 191800/142= 1350 moles
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If you make a Carbon (C) atom that has an overall charge of -1. How many protons does it have? How many electrons?=
6) Calculate the mass of a liquid with a density of 2.5 g/mL and a volume of 15 mL.
The mass of a liquid with a density of 2.5 g/mL and a volume of 15 mL is 37.5g.
What is Density ?
Density is the measurement of quantity or mass per unit of volume in a particular substance. Its units are grams per centimeters cube (g/cm³) or kilograms per liter (kg/l)
⇒ g/cm³ can also be written as g/mL because 1cm³ = 1mL
What is Volume ?
Volume is a measure of space. When measuring the volume of a liquid which is sometimes referred to as capacity, the units liters (L) and milliliters (mL) are used.
What is Mass ?Mass is defined as amount of matter present in a body. Gram (g) and kilogram (kg) are the common units.
density = mass / volume
mass = density × volume
= 2.5 g/mL × 15 mL.
= 37.5 g
Since density is given in g/mL and volume is given in mL, we can keep the unit of mass in grams (g).
Thus we can conclude that the mass of liquid is 37.5g
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When methane is burned with oxygen the products are carbon dioxide and water. If you produce
14 grams of water and 16 grams of carbon dioxide from 8 grams of methane, how many grams of
oxygen were needed for the reaction?
A materials engineer wants to test how the thickness of insulation in sleeping bags affects their performance in freezing temperatures. She constructs sleeping bags with varying insulation thickness and records the temperature inside the sleeping bag every five minutes for 8 hours at 0°C. Which of the following is the dependent (outcome) variable in her experiment?
Temperature changes in sleeping bag is the dependent (outcome) variable in her experiment.
What are the types of variables in experiment ?Variables are the major manipulating factor which is compulsorily added to the experiment in order to get accurate results like person's eye color, its value can change from brown to blue depending on different factors.
An independent variable can not change by the presence of other factor where as dependent variable depend on other variable and can be influenced by other components.
Control variables are the constant which only determine the accuracy of the experimental result and prevent bias from the experiment.
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What is the weight percent (w/w%) of a solution prepared by dissolving 15.0 g of sugar into 50.0 g of water?
Answer:
23.1%
Explanation:
To find the weight percent (aka. mass percent), you need to use the following equation:
mass of solute (g)
Weight Percent = ---------------------------------- x 100%
mass of solution (g)
In this case, the solute is sugar and the solution is the sugar and water. You can find the weight percent by plugging the given values into the equation and solving. The final answer should have 3 sig figs like the given values.
mass of solute = 15.0 g
mass of solution = 15.0 g + 50.0 g = 65.0 g
15.0 g solute
Weight Percent = ------------------------- x 100%
65.0 g soln
Weight Percent = 0.231 x 100%
Weight Percent = 23.1%
235 miles converted to kilometers
Answer:
378.196
Explanation:
235 miles = 378.196 Kilometers
3. Give two reasons why there are different values for the weighted average atomic mass of Candium
in the class.
The majority of elements are found in mixtures of two or more isotopes in nature. Every element's isotope has a set mass and a natural percent abundance. These isotopes' masses in their respective abundances must be reflected in the element's mass.
Every isotope contributes to the average atomic mass of an element, which is displayed in the element's box on most periodic tables (at least, the isotopes that exist naturally). However, the average is a weighted average.A weighted average mass is an average that considers the frequency of each mass in the sample.Atoms with the same atomic number that have varied masses because of differing neutron counts are known as isotopes. The weighted average of an element's isotopes' masses determines its atomic mass. Each isotope's mass and relative abundance as they exist in nature are considered in the weighted average.These are the reasons for different values of weighted average atomic mass.
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Red gold is a gold-copper alloy used to make jewlery. A piece of jewlery made of red gold weighs 8.97g and has a volume of 0.528cm3. Gold has a density of 19.3g/cm3 and copper has a density of 8.96g/cm3. Calculate the percentage by mass of each metal in jewelry. Assume the total volume of the jewelry is the sum of the volumes of the two metals it contains
Percent of gold and copper are 88.2 and 11.8
Red gold is a gold-copper alloy used to make jewelry .
Let the mass of gold be m1
Let the mass of copper be m2
We are given that m1+m2 =8.97 g
We know that volume is the ratio of mass to density
Thus
m1/d1 + m2/d2 = 0.528 cm3
where d1 and d2 is the density of gold and copper
m1/19.3 + m2/8.96 = 0.528
8.96m1 +19.3 m2 = 0.528 x 19.3 x 8.96 = 91.305
putting m1 = 8.97 - m2
8.96 ( 8.97 - m2 ) + 19.3 m2 = 91.305
80.3712 - 8.96m2 + 19.3 m2 =91.305
10.34 m2 = 91.305-80.3712
m2 = 10.9338 /10.34
=1.0537gm
m1=8.97-1.0537
=7.91gm
Therefore, percent of gold = 7.91/8.97 x 100 =88.20%
percent of copper = 100-88.2=11.8%
Therefore, percent of gold and copper are 88.2 and 11.8
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How many miles can you drive, if your car gets 20.30 miles per gallon
and you have 12.00 gallons of gas?
Answer:
243.60 miles
Explanation:
Multiply miles per gallon times number of gallons. Both starting numbers are given to two decimal places so our answer is as well.
PLS HELP!! Animation shows a complete revolution of the Earth around the sun. What happens during this time?
A. Earth experiences a complete day.
B. The moon makes one complete phase change.
C. Four seasons occur on Earth.
D. Day turns to night. Btw this is Science not chemistry!
Answer:
C
Explanation:
it would be a lot more easier if you could show the animation
But nevertheless your answer would be
C Four seasons occur on Earth.
Answer: The answer is letter C.
Explanation:
There are four seasons on our planet Earth . These four seasons are, Spring, Summer, Autumn, And Winter (my personal favorite.)
These four seasons only occur, based on which side of the sun our continent is on. Yes we could literally be facing the sun, but the sun isn’t really directing heat now. (Don’t fact check that.) but anyways, hopefully this helps. And remember, the earth take 365 days to orbit the sun. Which is 12 months, and each season has 3 months each to roam the earth.
In ironmaking, iron metal can be separated from iron ore (Fe2O3) by heating the ore in a blast furnace in the presence of coke, which is a form of carbon: 2 Fe2O3(s) + 3 C(s) → 4 Fe(s) + 3 CO2(g) If 1000 kg of iron ore and 120 kg of coke are heated in a blast furnace, determine the limiting reactant, the theoretical yield of iron metal, and the theoretical yield of carbon dioxide.
The limiting reactant is iron ore, the theoretical yield of iron metal is 701.344 kg, and the theoretical yield of carbon dioxide is 413.292 kg.
Stoichiometric problemFrom the equation of the reaction:
[tex]2 Fe_2O_3(s) + 3 C(s) --- > 4 Fe(s) + 3 CO_2(g)[/tex]
The mole ratio of iron ore to carbon is 2:3.
Mole of 1000 kg of iron ore = 1000000/159.69
= 6,262 moles
Mole of 120 kg carbon = 120000/12
= 10,000 moles
Thus, it appears that the carbon is in excess while the iron ore is limited in availability.
The mole ratio of the iron ore and the iron produced is 1:2. Thus, the equivalent number of moles of iron produced will be:
6,262 x 2 = 12,524 moles
Mass of 12,524 moles of iron = 12,524 x 56
= 701,344 g or 701.344 kg
Thus, the theoretical yield of iron is 701.344 kg.
The mole ratio of the iron ore and the carbon dioxide produced is 2:3. The equivalent mole of carbon dioxide produced will be:
6,262 x 3/2 = 9,393 moles
Mass of 9,393 moles carbon dioxide = 9,393 x 44
= 413,292 or 413.292 kg
The theoretical yield of carbon dioxide is, therefore, 413.292 kg.
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Which statement correctly compares a hypothesis and a theory? A theory is a prediction for a specific situation, while a hypothesis is used to make predictions for many similar situations. A hypothesis is a prediction for a specific situation, while a theory is used to make predictions for many similar situations. A theory provides an explanation, but a hypothesis does not. A hypothesis provides an explanation, but a theory does not.
The statement that correctly compares a hypothesis and a theory is that a hypothesis is a prediction for a specific situation, while a theory is used to make predictions for many similar situations (option B).
What is a hypothesis?A hypothesis is a tentative conjecture explaining an observation, phenomenon or scientific problem that can be tested by further observation, investigation and/or experimentation.
On the other hand, a scientific theory is a coherent statement or set of ideas that explains observed facts or phenomena and correctly predicts new facts or phenomena not previously observed, or which sets out the laws and principles of something known or observed.
A theory is simply a hypothesis confirmed by observation or experiment.
Therefore, the statement that correctly compares a hypothesis and a theory is that a hypothesis is a prediction for a specific situation, while a theory is used to make predictions for many similar situations.
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Tell how many protons, neutrons, and electrons 39_K 1_H contains ?
19 protons, 20 neutrons and 18 electrons.
Every atom has a proton, a subatomic particle, in its nucleus. The particle is electrically charged positively.Except for basic hydrogen, every atom's nucleus contains a neutron, a subatomic particle.A negatively charged subatomic particle known as an electron can either be free or attached to an atom.The protons are determined by the atomic number (19).
therefore, number of proton = 19
The protons and neutrons together make up the atomic mass.
P + N = 39
19 + N = 39
number of neutrons = 39 - 19 = 20
A neutral atom has an equal number of protons and electrons. The negative charge is the same as the positive charge. The number of electrons represents the negative charge. The charge of this ion is +1. Therefore, find the negative charge.
= -19 + 1 = -18
therefore, number of electrons are 18.
Thus, no. of proton = 19
no. of neutrons = 20
no. of electrons = 18
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The accepted value for the density of iron is 7.9 g/mL. Four student groups examine the density of iron in the lab. Which of the following experimental results are most precise?
For 5.43 g/mL and 5.44 g/mL = 0.01 the least diff and most precise.
First of all, precision is determined by the difference in the two obtained values. If the difference between the two values obtained is less, then precision is more. If the difference between the two values obtained is more, then precision is less.
For 5.43 g/mL and 5.44 g/mL , we can see that the difference between these two data is 0.01
For 7.98 g/mL and 7.91 g/mL , we can see that the difference between these two data is 0.07
For 7.65 g/mL and 7.64 g/mL , we can see that the difference between these two data is 0.01
For 7.06 g/mL and 7.03 g/mL , we can see that the difference between these two data is 0.03
As we can see that, the most difference between the data is 0.07 between 7.65 g/mL and 7.64 g/mL and thus, they are least precise.
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a protostaar forms once the nebular cloud condenses and the core begins
Two construction workers are attempting to pull a slab of concrete off of the ground. Each of the workers are pulling up
with a force of 225 N, while the slab of concrete applies a gravitational force of 400 N in the opposite direction, remaining
stationary.
If the pulling forces applied to the slab of concrete are assigned a positive value, what is the net force of the scenario, and
in which direction will the slab of concrete move?
(1 point)
O 50 N; the slab will move upward
O 175 N; the slab will move upward
O-175 N; the slab will remain stationary
O -50 N; the slab will remain stationary
If the pulling force of 225 N each is assigned a positive value, the net force of the scenario will be 50 N and the slab will move upward.
What is the net force?The net force acting on an object is the resultant force. It is the sum of all the forces acting on the object.
The forces acting on the slap concrete are three, namely:
The gravitational force of 400 NThe pulling force of 225 N by construction worker 1The pulling force of 225 N by construction worker 2These forces are acting in opposite directions. The gravitational force is acting downward while the pulling forces by the construction workers are acting upward.
Now, the pulling forces of the construction workers are assigned positive values. Since the gravitational force acts in opposition to the pulling forces, it means the gravitational force will be assigned a negative value.
Thus, the resultant force can be calculated as:
225 + 225 - 400 = 50 N
The resultant force is 50 N and positive. This means the slab will move in an upward direction.
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How does she/Judy Hopps discover Nick Wolf’s true intentions/con in the movie Zootopia?
Answer:
I think it was when she caught him talking to his "child"
Ibuprofen can be found in 800 mg doses in over-the-counter analgesics, such as Advil and Motrin. How many grams of iburofen
does such a tablet contain?
800 mg =
g
The grams of iburofen does such a tablet contain 800 mg = 0.8g Ibuprofen
1 g = 10^-3g = .001g
Ibuprofen has 800 mg doses in over-the-counter analgesic
800g = 800 × .001
= 0.8g
Ibuprofen is Nondteriodal Anti-inflammatory Drug (NSAID)Ibuprofen's Mechanism of Action is Decreases inflammation, pain, and fever through inhibition of cyclooxygenase activity and prostaglandin synthesisnonsteroidal anti-inflammatory medication (NSAID) used for pain relief and to reduce fever by stops inflammation and by blocking formation of cyclo-oxygenase (COX-2) a chemical mediator of inflammatory chemicals. i.e prostaglandinsIt comes under the Class analgesic (reduce pain) and antipyretic (FIRE - reduce fever)e side effects of ibuprofen NSAID are peripheral edema, fluid retention with edema, tinnitus, purpura, petechiae, anorexia, diarrhea, rash, nausea, vomiting, fatigue, dizziness, lightheadedness, anxiety, confusionTo know more about analgesic visit :
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A single population is made of
O multiple organisms of the
same species.
O multiple organisms of different species.
• multiple communities.
O multiple biomes.
ASAP HELP
When one molecule of sucrose is burned with oxygen to make carbon dioxide and water, how
many carbon dioxides are made? Hint, carbon dioxide is CO2.
6 12 1 24
One molecule of sucrose is burned with oxygen to make carbon dioxide and water.
Disaccharide sugar sucrose is composed of glucose and fructose. It is produced naturally by plants and is the main component of white sugar. C₁₂H₂₂O₁₁ is the chemical formula for it.
Extraction and refining sucrose for human use can be done from either sugarcane or sugar beet. Raw sugar is created from crushing the cane, which is consistently delivered to other sectors to be refined into pure sucrose. Sugar mills generally are located in the tropical regions near the sugarcane plantations.
C₁₂H₂₂O₁₁ + 12O₂ → 12CO₂ + 11H₂O
When one molecule of sucrose is burnt, we get 12 carbon dioxide molecules.
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Describe how you prepare 2.00L of each of the following solutions. 0.250 M NaOH from Solid NaOH
To prepare 2.00 L of 0.250 M NaOH from solid NaOH, dissolve 20 g of NaOH in 2.00 L of water to form 0.250 M NaOH solution.
A stock solution is a solution with high concentration of any particular solute and it is used for obtaining moderate quantities of solute using small volumes.
Sodium hydroxide is a strong electrolyte with the molecular formula NaOH. Sodium hydroxide completely dissociates in aqueous solution to produce Na⁺ and OH⁻ ions. Hence, sodium hydroxide is considered to be a strong base. Sodium hydroxide, also called caustic soda, is highly hygroscopic in nature.
Firstly, we will prepare a stock solution, by placing n grams of NaOH in a liter volumetric flask. Then add 100 mL dilute water and make up the volume of solution to 1 liter.
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Write a balanced redox reaction between acidified potassium permanganate and iron two chloride and predict if the reaction is spontaneous Emno.4/Mn^2+=1.74v fe^2+|fe^3+=0.75
The balanced redox reaction between acidified potassium and iron two chloride is given as ,
5[tex]Fe^{+2}[/tex] + 1 [tex]MnO_{4} ^{- }[/tex] + 8 [tex]H^{+}[/tex]→ 5[tex]Fe^{+3}[/tex] ++ 1 [tex]Mn^{+2 }[/tex] + 4[tex]H_{2} O[/tex]
The reaction is spontaneous
Place these numbers as coefficients in front of the formulas containing those atoms.
[tex]Fe^{+2}[/tex] + [tex]MnO_{4} ^{- }[/tex] → [tex]Fe^{+3}[/tex] + [tex]Mn^{+2 }[/tex]
Balance all remaining atoms other than H and O
[tex]Fe^{+2}[/tex] + [tex]MnO_{4} ^{- }[/tex] → [tex]Fe^{+3}[/tex] + [tex]Mn^{+2 }[/tex]
Balance O.
Add enough H2O molecules to the deficient side to balance O.
We have 4O atoms on the left, so we need 4H2O
on the right.
5[tex]Fe^{+2}[/tex] + 1 [tex]MnO_{4} ^{- }[/tex] + 8 [tex]H^{+}[/tex]→ 5[tex]Fe^{+3}[/tex] + 1 [tex]Mn^{+2 }[/tex] + 4[tex]H_{2} O[/tex]
The reaction is spontaneous when the value of E ° for the reaction is positive .
E ° for [tex]MnO_{4} ^{- }[/tex]/ [tex]Mn^{+2 }[/tex] = 1.74 V
E ° = [tex]Fe^{+3}[/tex]/ [tex]Fe^{+2}[/tex] = 0.75 V
E ° for reaction = 1.74 V - 0.75 V = 0.99 V
Hence , E ° for reaction is positive .
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the kind of light coming from a substance
HELP PLEASE!!! HELP!!! manuel tested the effects of temperature on solubility of sugar in water. he measured the maximum amount of sucrose (in grans) he could dissolve in 100 g of water. manuel repeated the test at five different temperatures. the graph of his results are below
based on his observations which of the following is a general hypothesis manuel might form?
a) the solubility of a solid increases as the temperature increases
b the solubility of a solid decreases as temperature increases
c) the decreasing solubility of solid raises the temperature of water
Answer:
A
Explanation:
A rise in temperature means that there is more thermal energy which will be used in the reaction by the sugar/sucrose, that is why solubility increases with temperature increase
Answer: The solubility of a solid increases as the temperature increases.
Explanation: THE ANSWER!! okay everbody
Can somebody help me if you know what this is
The nucleus of an atom contains which subatomic partcles?
Answer:
The nucleus contains two types of subatomic particles, protons and neutrons. The protons have a positive electrical charge and the neutrons have no electrical charge. A third type of subatomic particle, electrons, move around the nucleus. The electrons have a negative electrical charge.
a 24.37mol of gas occupied 5.32ml vessel. what mole of the gas should be removed to get a volume of 2.56ml?
Mole of the gas should be removed to get a volume of 2.56ml is 10.26 mol.
Equation :Given data,
Volume₁ = 5.32ml
number of moles at 5.32ml n₁ = 24.37mol
Molarity = ?
Volume₂ = 2.56ml
number of moles = ?
First to find molarity of gas using formula,
M = nV
where,
M is molarity
n is numbers of mole
V is volume
So, putting the values of volume₁,
M = 24.37mol x 5.32ml
M = 129.65 mol/ml
So again to get moles of second volume in same formula we have,
M = nV
So,
n = M / V
n₂ = 129.65 / 2.56ml
n = 50.64mol
So,
n₂ - n₁ = 50.64mol - 24.37mol
n = 26.27
So,
mole of the gas removed = 26.27 / 2.56
mole of the gas removed = 10.26mol
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