Answer:
B. double replacement
Explanation:
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ERGENT!!!!!!!!!!!: A runner eats a snack with 375 Calories of nutritional energy. After her snack, she burns 3,160 kJ while running. [1 Calorie = 4.184 kJ] Which of the following statements is TRUE? (Select ALL that apply) *
A. There were 3,140 kJ of energy in the snack.
B. There were 1,570 kJ of energy in the snack.
C. During her run, she used 755 Calories of energy.
D. During her run, she used 189 Calories of energy.
E. The runner used fewer Calories while running than she consumed during her snack.
F. The runner used more Calories while running than she consumed during her snack.
Answer:
B. There were 1,570 kJ of energy in the snack.
C. During her run, she used 755 Calories of energy.
F. The runner used more Calories while running than she consumed during her snack.
Explanation:
According to this question, a runner eats a snack with 375 Calories of nutritional energy. After her snack, she burns 3,160 kJ while running.
Since 1 Calorie = 4.184 kJ, it means that the runner consumed 375 × 4.184 = 1570 kJ of energy. In other words, THERE WERE 1,570 kJ OF ENERGY IN THE SNACK.
Also, the runner burns 3,160 kJ while running meaning that she equivalently burnt 3160/4.184 = 755.258 calories. Approximately, 755 calories of energy were burnt by the runner while running.
In a nutshell, the runner consumed 375 calories of energy in her snack but used up 755 calories while running. This means that the runner used more Calories while running than she consumed during her snack.
I really need help with this ASAP
Answer:
1) Reaction rate, in chemistry, the speed at which a chemical reaction proceeds. It is often expressed in terms of either the concentration (amount per unit volume) of a product that is formed in a unit of time or the concentration of a reactant that is consumed in a unit of time.
2) By collecting the hydrogen gas that is produced over water or in a syringe, rate graphs can be produced. The volume of gas produced and the time taken need to be recorded. The rate of the same reaction could be monitored by measuring the change in the mass of reactants as they react to form products.
A student uses visible spectrophotometry to determine the concentration of CoCl2(aq) in a sample solution. First the student prepares a set of CoCl2(aq) solutions of known concentration. Then the student uses a spectrophotometer to determine the absorbance of each of the standard solutions at a wavelength of 510nm and constructs a standard curve. Finally, the student determines the absorbance of the sample of unknown concentration.
The original solution used to make the solutions for the standard curve was prepared by dissolving 2.60g of CoCl2 (molar mass 130.g/mol) in enough water to make 100.mL of solution. What is the molar concentration of the solution?
A) 0.200 mol
B) 0.500 mol
C) 1.00 mol
D) 5.00 mol
Answer:
A
Explanation:
2.60 g of CoCl2 was dissolved in water to make 100 mL of solution.
Number of moles of CoCl2 dissolved = mass/molar mass
= 2.60/130
= 0.02 mole
Molar concentration of solutions = number of moles/volume (dm3)
= 0.02/0.1
= 0.200 M
Hence, the molar concentration of thesolution is 0.200 molar.
Correct option = A
A student prepared a solution used to make the solutions for the standard curve by dissolving 2.60g of CoCl₂ (molar mass 130. g/mol) in enough water to make 100. mL of solution. The molar concentration of the solution is 2.00 M.
First, we will convert 2.60 g to moles of CoCl₂ using its molar mass (130. g/mol) as the conversion factor.
[tex]2.60 g \times \frac{1mol}{130. g} = 0.0200 mol[/tex]
0.0200 moles of CoCl₂ are in 100. mL (0.100 L) of solution. The molar concentration of the solution is:
[tex]M = \frac{0.200 mol}{0.100 L} = 2.00 M[/tex]
A student prepared a solution used to make the solutions for the standard curve by dissolving 2.60g of CoCl₂ (molar mass 130. g/mol) in enough water to make 100. mL of solution. The molar concentration of the solution is 2.00 M.
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Why is sublimation such a critical component for the water cycle in cold climates?
Answer:
Sublimation is a critical component for the water cycle in cold climates where water in the solid form or ice is prevalent because sublimation which is the transformation of a solid substance to a liquid without passing through the liquid phase including when ice transforms directly into vapors, readily takes place when the relative humidity is low and the wind is dry, which are conditions that can be found combined mainly in cold climates
Explanation:
N2 + 3H2 Right arrow. 2NH3 What is the percent yield of NH3 if the reaction of 26.3 g of H2 produces 79.0 g of NH3? Use Percent yield equals StartFraction actual yield over theoretical yield EndFraction times 100..
Answer:
53.4%
Explanation:
N₂ + 3H₂ → 2NH₃
Given that:
26.3 g of H₂ react with N₂ to produce 79.0 g of NH₃
Then:
The number of moles of H₂ = 26.3g of H₂ * (1 mol of H₂/ 2.02g of H₂)
= 13.05 mol of H₂
The number of moles of NH₃ = 13.05 mol of H₂ * ( 2mol of NH₃/ 3 mol of H₂)
= 8.697 mol of NH₃
The mass of NH₃ = 8.697 mol of NH₃ *( 17.04g of NH₃/ 1 mol of NH₃) = 148.1 g of NH₃
The percent yield = actual yield/ theoretical yield * 100%
The percent yield = ( 79.0 g/ 148.1 g )* 100%
The percent yield ≅ 53.4 %
Answer:
53.4
Explanation:
It is difficult to burn a heap of green leaves but dry leaves catch fire easily.
Explain.
Answer:
i dont really have explaining but see green leaf have some amount of water and chlorophyll so it doesn't get burnt and dry leaves lose water and have no amount of them so they get burnt
HOPe It WiLl HeLp........what is Bohr's atomic model?
Answer:
The Bohr model and all of its successors describe the properties of atomic electrons in terms of a set of allowed (possible) values. Atoms absorb or emit radiation only when the electrons abruptly jump between allowed, or stationary, states. Direct experimental evidence for the existence of such discrete states was obtained (1914) by the German-born physicists James Franck and Gustav Hertz.
Explanation:
If the weight of displaced liquid and the weight of an object are the same, the object will:
Answer:
Float
Explanation:
If the weight of liquid displaced and the weight of an object are the same, the object will float in the liquid.
From Archimedes principle, when an object is immersed in fluid, a force called upthrust supports it and it equal to the weight of the liquid displaced.
When in a liquid, the weight of the liquid displaced is the same as that of the of the object, it will float and not sink.
How is light produced in an atom?
Answer:
light is the result of electrons moving between defined energy levels in an atom called shells.
Explanation:
when something exited an atom like collision with another atom or a chemical reaction, an electron may absorb energy boosting it to a higher level shell.
Please help my teacher is rushing me
Which of these is the correct Lewis dot structure for LiCl.
NEED ASAP!!!
Sound energy travels by electromagnetic radiation.
True
False
false
Explanation:
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what is a significant figure of 0.502 ?
a summary about a gas 5 sentences
Answer:
Gases have two properties that set them apart from solids and liquids. First, gases spontaneously expand to fill the container they occupy, no matter its size. In other words, a gas has no fixed volume or shape. Secondly, gases are easily compressible.
Explanation:
Hope this helps
In animals. energy is produced by the:
A. endoplasmic reticulum
B. nucleus
C. mitochondria
D. chloroplast
When an object such a a stone is dropped into water, it disturbs the surface of the water. Waves form at the surface of the water and travel outward from the point of the disturbance.
The diagram below is based on a single frame from a video of the waves that formed when a stone was dropped into water.
If a student were to measure the distance labeled as "Z," she would know the value of the _______ of the wave.
A.
radius
B.
amplitude
C.
frequency
D.
wavelength
Answer: sorry i’m late but the answer is D- wavelength :)
Explanation:
How many molecules are there in 5H20?
A.5
B.7
C.10
D.11
What is the frequency of a particular type of electromagnetic
radiation with a wavelength of 5.00 x 10-8 m?|
Answer:
f = 0.6× 10¹⁶ Hz
Explanation:
Given data:
Wavelength of radiation = 5.00 × 10⁻⁸ m
Frequency of radiation = ?
Solution:
Formula:
Speed of light = wavelength × frequency
speed of light = 3 × 10⁸m/s
Now we will put he values in formula.
3 × 10⁸m/s = 5.00 × 10⁻⁸ m × f
f = 3 × 10⁸m/s / 5.00 × 10⁻⁸ m
f = 0.6× 10¹⁶ s⁻¹
s⁻¹ = Hz
f = 0.6× 10¹⁶ Hz
How many days does it take for 16 g of palladium-103 to decay to 1.0 g? The half-life of palladium-103 is 17 days.
Answer: It will take 68 days for the palladium to decay.
Explanation: ima smart dude
How do the elements in each group differ? How are they similar?
Explanation:
All the elements in one group have the same number of valence electrons. The valence electrons are those on the energy level the most distant from the nucleus. These valence electrons are those involved in bonding with other atoms to form compounds.
In the periodic table elements in the same group posses similar physical and chemical property and this is due to the similarity in the number of valence electrons found in their valence shells.
While in the periodic table as we move down a group the atomic number of the elements will continue to increase because elements in the same group are located in different periods as well.
Hence we can conclude that the difference in the elements located in a group is that they have different atomic numbers while the similarities is that the posses the same number of valence electrons.
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New account if u added my account antonio716 this my new account new friends
how did u even find me again i wanna see if people are
me with a wey some one made
Answer:ok
Explanation:
Which is the more energetic, a red photon or a blue photon? Explain in terms of frequency and wavelength.
Answer:
Shorter waves vibrate at higher frequencies and have higher energies. Red light has a frequency of around 430 terahertz, while blue's frequency is closer to 750 terahertz. Red photons of light carry about 1.8 electron volts (eV) of energy, while each blue photon transmits about 3.1 eV.
Im so sorry if this isnt what you are looking for :(
Happy if it is :3
Glycerine is known as a negative catalyst.why?
Answer:
The presence of 1-2% ethanol as catalyst, suppresses the oxidation of chloroform with oxygen to give a poisonous gas called phosgene. ... Here glycerol acts as negative catalyst. Criteria or characteristics of catalysts. i. The mass and chemical composition of catalyst should remain unchanged at the end of the reaction.
Explanation:
What’s the definition of renewable energy
Answer:
energy from a source that is not depleted when used, such as wind or solar power.
Explanation:
Explanation:
renewable energy is energy from a source that is not depleted when used such as wind or solar power.
Hope this helps :)
How does the mass of an oxygen nucleus
compare to the mass of the 8 protons and
8 neutrons that make up the nucleus?
Answer: The mass of the nucleus is less than the mass of the 8 protons and 8 neutrons.
Explanation:
54. Copper(I) sulfide is formed when copper and sulfur are
heated together. In this reaction, 127 g of copper reacts
with 41 g of sulfur. After the reaction is complete, 9 g of
sulfur remains unreacted. What is the mass of copper
sulfide formed?
SEL
Ma
Answer:
159g
Explanation:
Copper (I) sulfide is formed by the chemical reaction between copper and sulfur. Copper is a limiting reagent that results in the formation of 190.26 grams of copper(I) sulfide.
What is a limiting reagent?A limiting reagent is defined as the reactant that gets completely utilized in the reaction and affects the amount of the product formation. On the contrary, the excess reagent is present in more amounts.
Given,
Mass of copper = 127 gm
Mass of sulfur = 41 gm
Moles of copper:
n = mass ÷ molar mass
n = 127 ÷ 63.546
n = 1.99
Moles of sulfur:
n = 41 ÷ 32.065
n = 1.27
The reaction is shown as:
Cu + S → CuS
Here, 9 g of sulfur remains unreacted and hence is an excess reagent, and copper being consumed is a limiting reagent.
Here, 1 mole of copper reacts to form 1 mole of copper sulfide hence, 1.99 moles of Cu produces, 1.99 moles of copper sulfide.
Mass of CuS is calculated as:
Mass = moles × molar mass
Mass = 1.99 mol × 95.611 g/mol
= 190.26 grams
Therefore, 127 gm of copper and 41 gm of sulfur produces 190.26 grams of copper sulfide.
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How could a synthetic material such as Acegram affect society?
Explanation:
Synthetic fiber or synthetic fibre (in British English; see spelling differences) are fibers made by humans through chemical synthesis, as opposed to natural fibers that are directly derived from living organisms. They are the result of extensive research by scientists to improve upon naturally occurring animal and plant fibers. In general, synthetic fibers are created by extruding fiber-forming materials through spinnerets, forming a fiber. These are called synthetic or artificial fibers. Synthetic fibers are created by a process known as polymerization, which involves combining monomers to make a long chain or polymer. The word polymer comes from a Greek prefix "poly" which means "many" and suffix "mer" which means "single units". (Note: each single unit of a polymer is called a monomer). There are two types of polymerization: linear polymerization and cross-linked polymerization.
Synthetic material are madeup of monomers and long chain of monomers are known as polymers. The process is known as polymerization and the synthetic material are turned as microplastic which takes a long period of time to decompose. By this way the synthetic materials are very harmful for the society.
What is synthetic material?Synthetic materials are microplastic pollution and madeup up of polymers which is a long chain of polymers and the process is known as polymerization.
The synthetic materials are often converts into microplastic that takes a long period of time to decompose and they are also responsible for generation of greenhouse gases.The synthetic material which is popularly known is nylon which is very tough to recycle.
Therefore,synthetic material are turned as microplastic which takes a long period of time to decompose. By this way the synthetic materials are very harmful for the society.
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What two gases are produced during the electrolysis of water?
Answer:
hydrogen and oxygen.
Explanation:
The smallest particle of an element that retains the properties of that element is a(n) ____. a. atom c. proton b. electron d. neutron
Answer: proton
Explanation:
They are what give an atom it’s identity
This reaction releases energy as heat. Explain whether the reaction is exothermic or endothermic and whether it obeys the law of conservation of energy
Answer:
Exothermic, it obeys the law of conservation of energy
Explanation:
The reaction is an exothermic change. In this kind of change, heat is liberated to the surrounding. So the surrounding becomes hotter at the end of the heat change.
In chemical reactions that involves the loss of energy as heat, they obey the law of conservation of energy.
The law of conservation of energy states that energy is neither created nor destroyed but transformed from one form to another. In such reactions as this, chemical energy is transformed into heat energy.