The answer for this question is C.
The moon is 260,000 miles away. How many feet is it from earth?
Answer:
1,372,800,000 Feet
Explanation:
1 Mile = 5280 Feet
260,000 Miles = 5280 × 260,000 Feet
260,000 Miles = 1,372,800,000 Feet
How can you increase the gravitational potential energy (GPE) of an empty shoe box on the bottom shelf of a bookcase?
A. all of the options listed here will increase the GPE
B. add items to the box and raise it to a higher shelf
C. add items to the box to increase its mass
D. raise the box to a higher shelf
We can calculate the about of potential energy in an object using the formula PE = mgh where m is the mass of the object, g is the acceleration due to gravity (which on Earth is a constant 9.8) and h is the height the object is from ground. If I have a 2kg bar of gold and raise that to a shelf mounted 3 meters from the ground what is that objects GPE? Remember to insert the numbers into the formula like this PE = (2)B. (9.8) (3) , you may use your calculator to complete this multiplication problem.
A. 14.8 J
B. 88.2 J
C. 58.8 J
D. 176.4 J
Which is an example of only potential energy
A. a skateboard rolling down a hill.
B. a puppy sleeping on the ground under a tree.
C. an elevator moving up to the 3rd floor.
D. an apple step on top of the teacher’s desk.
If Kinetic energy has the shorted name of energy of motion, what is the shortened name for Potential Energy?
A. Stored energy
B. Joules
C. Newtons
D. Awkward energy
Potential energy can be converted into kinetic energy, a good example of this is when a pole-vaulter bends the pole during a leap. When the pole is bent the most, does it store elastic or gravitational potential energy?
A. Only gravitational potential energy because that is more powerful than elastic potential energy.
B. The pole stores gravitational potential energy because it is bent from its natural shape when off the ground.
C. The pole stores elastic potential energy when the pole is bent because its shape is change from its natural shape and it will want to go back to its original form, just like a spring or stretched elastic material.
D. It has neither elastic or gravitational potential energy.
Is the potential energy of the roller coaster elastic or gravitational?
A. neither
B. gravitational
C. elastic
D. both
In the EXPLORE section of your lesson 4.08 on Potential energy there were several animations to watch that provided a graphic illustrating how the PE and KE in a system changed as skateboarder rides a pipeline or a pendulum moves, why did the bar for the total energy remain constant?
A. Energy is converted from kinetic to potential and potential to kinetic, but the total amount of energy is conserved.
B. Because these models do not take into account the impact of friction and air resistance and are helping to solidify the concept of energy conservation and that the total mechanical energy remains constant in that model.
C. This is because no energy is being created or destroyed in this system.
D. all answers given are correct
In class we learned that a car model with a mass of 5.0 kg that is placed on a track 3.0 m off the ground and is traveling at a speed of 4 m/s. Has a measurable kinetic and potential energy. Calculate the total mechanical energy of the object using the formula ME = KE + PE when the KE is 40 joules and the PE is 147 joules. (You may use your calculator on this addition problem.)
A. 60 J
B. 147 J
C. 40 J
D. 187 J
Answer:someone answer 4 b
Explanation:
123
Two solutions initially at 24.60°C are mixed in a coffee cup calorimeter. when a 100.0 ml volume of 0.100 m AgNO3 solution is mixed with a 100.0 ml sample of 0.200 m nacl solution, the temperature in the calorimeter rises to 25.30°C. Determine the dh for the reaction as written below. Assume that the density and heat capacity of the solutions is the same as that of water.
NaCl(aq)+AgNO3(aq) → AgCl(s)+NaNO3(aq)
a. -69 kJ
b. -35 kJ
c. -16 kJ
d. -250 kJ
Answer:
= - 59.7 kJ/mol
Explanation:
The total volume of the solution is:
= (100 + 100 ) mL
= 200 mL
mass of the solution = 200 × 1.00 = 200 g
Heat gained by the solution:
= mass × specific heat × temperature change in solution
= 200× 4.184 × (25.3 - 24.6)
= 585.76 J
Heat gained by calorimeter
= heat capacity × change in temperature of caiorimeter
= 15.5 × (25.3 -24.6)
= 10.85 J
Thus, total heat released = total heat gained
= 585.76 + 10.85 J
= 596.61 J
The no of moles of AgNO3 = 100/1000 × 0.100 = 0.01 mol
The no of moles of NaCl = 100/1000 × 0.200 = 0.02 mol
From above, it is obvious that AgNO3 is the limiting reagent
∴
ΔH_{rxn} = total heat released/ moles of AgNO3
= -596.61/0.01
= 59661 J/mol
= - 59.7 kJ/mol
6.
What volume does 14.0 g of Hydrogen gas (Hz) take up at a temperature of 30°C and a pressure of 120 kPa?
Note: Use Ideal gas law. R=8.31 (kPa x L)/(mol x K)
Answer:
V = 146.87 L
Explanation:
Given data:
Mass of sample = 14.0 g
Pressure of sample = 120 kpa
Volume of gas = ?
Temperature of gas = 30°C
Solution:
Number of moles of gas:
Number of moles = mass/molar mass
Number of moles = 14.0 g/ 2 g/mol
Number of moles = 7 mol
Pressure of gas:
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 8.31 KPa.L/ mol.K
T = temperature in kelvin
Now we will convert the temperature.
30+273 = 303 K
by putting values,
120 KPa × V = 7 mol × 8.31 KPa.L/ mol.K × 303 K
V = 17625.51 KPa .L/ 120 KPa
V = 146.87 L
Identify the two functional groups that react together to form the ester linkage between monomers in the PET polymer
Answer:
PET polymer or Polyethylene terephthalate is also known as Terylene. In the PET polymer, the ester linkage between the monomers is formed by the reaction of the OH group of ethylene diol (glycol) and the CO2H group of terephthalic acid.
In the family of polyester, PET is considered as the mostly used thermoplastic polymer resin.
It is used widely in clothing fibers, as liquid and food containers, and as a substance for engineering resins. In the United Kingdom it is known as terelyne, in the United States as Dacron, and in Russia as Lavsan.
Determine the oxidation number of sodium in Na202
Answer:
+1
Explanation:
Na₂O₂
NOTE: the oxidation number of oxygen is always –2 except in peroxides where it is –1.
Thus, we can obtain the oxidation number of sodium (Na) in Na₂O₂ as illustrated below:
Na₂O₂ = 0 (oxidation number of ground state compound is zero)
2Na + 2O = 0
O = –1
2Na + 2(–1) = 0
2Na – 2 = 0
Collect like terms
2Na = 0 + 2
2Na = 2
Divide both side by 2
Na = 2/2
Na = +1
Thus, the oxidation number of sodium (Na) in Na₂O₂ is +1
H2O2 is a polyatomic ion
?
Answer:
If you are meaning O2^2- ion, well, don’t forget that ions have a charge, that has to be specified when referring to them. It is a polyatomic ion just because it consists of more than one atom, irrespective of the fact that these atoms are of the same element or not. It was given that name because at the early times chemistry was founded as a science, it was found that with respect to other oxygenated substances, peroxides contained more oxygen than expected: Latin prefix per- gives the terms it is attached to the meaning of being increased, enhanced, and similar.
Explanation:
The figure shows the metabolic pathway for aerobic respiration. What part of the process does box E represent?
A. Pyruvate oxidation and the formation of acetyl-CoA
B. Electron transport via NADH and FADH2
C. Citric acid cycle
D. Glycolysis
Answer:
A
Explanation:
Answer:
b
Explanation:
The very top layer of Earth is the crust, which is relatively quite thin when compared to the other layers of Earth. Which of these best describes the composition of Earths crust?
1. Rocky
2. Gaseous
3. Liquid
4. Metallic
I NEED TO ANSWER PLEASE HELP ASAP PLEASEEEEE DONT SKIP I AM BEGGING YOU
Answer:
1 it is rocky
Explanation:
here why because the crust is made of igneous metamorphic and sedimentary rocks
If the nucleus of an atom is represented
as
24x11 the atom is?
Answer:
i think it Na (sodium)
Explanation:
identify the reactants in the following reaction: 2 ch3oh(l) + 3 o2(g) →2 co2(g) + 4 h2o(g)
Answer:
2 ch3oh(l) + 3 o2(g)
Explanation:
because they are at the beginning and they are what are being changed.
In the given chemical reaction: [tex]\rm 2 CH_3OH(l) + 3 O_2(g) \rightarrow 2 CO_2(g) + 4 H_2O(g)[/tex], the reactants are [tex]\rm CH_3OH[/tex] and [tex]\rm O_2[/tex], respectively.
Reactants are the starting materials or substances that are consumed in a chemical reaction to produce new products.
The reaction is a combustion reaction, where a fuel (in this case, methanol) reacts with oxygen gas to produce carbon dioxide and water vapor.
[tex]\rm 2 CH_3OH(l) + 3 O_2(g) \rightarrow 2 CO_2(g) + 4 H_2O(g)[/tex]
The starting molecules (reactants) in this reaction is [tex]\rm CH_3OH[/tex] and [tex]\rm O_2[/tex], which reacts to produce [tex]\rm 2 CO_2(g)\ and\ \4 H_2O(g)[/tex] as the final product.
Therefore, [tex]\rm CH_3OH[/tex] and [tex]\rm O_2[/tex] are the reactants in the given chemical reaction, respectively.
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Write the empirical formula of at least four binary ionic compounds that could be formed from the following ions:
Mg+2, Pb+4, I−, O−2
Answer:
MgI₂, MgO, PbI₄, PbO₂
Explanation:
For an ionic compound to be formed, it must be neutral, that is the total positive charge must be equal to the total negative charge.
Mg²⁺ and I⁻: The neutral ionic compound requires 1 Mg²⁺ and 2 I⁻ and the resulting empirical formula is MgI₂.
Mg²⁺ and O²⁻: The neutral ionic compound requires 1 Mg²⁺ and 1 O²⁻ and the resulting empirical formula is MgO.
Pb⁴⁺ and I⁻: The neutral ionic compound requires 1 Pb⁴⁺ and 4 I⁻ and the resulting empirical formula is PbI₄.
Pb⁴⁺ and O²⁻: The neutral ionic compound requires 1 Pb⁴⁺ and 2 O²⁻ and the resulting empirical formula is PbO₂.
Wha is the symbol and ionic charge of a element with 28 proton and 25 electrons?
Explanation:
bro the given address to subscribe and vaccine aur bhi
СH +
О, –
СО, +
НО
What is the balancing equation
Answer:
i would also like to know
Explanation:
plz..............................................
Which of the following does NOT describe elements? can join together to form compounds all the particles are alike can be broken down into simpler substances have unique sets of properties
Answer:
Can be broken down into simpler substances.
Explanation:
Elements are made of atoms, and that is the simplest understood unit of the universe. :) nOw GiB mY 50000 points.
Answer:
Can be broken down into simpler substances
Explanation:
Because atoms cannot be created or destroyed in a chemical reaction
(03.05 LC)
Look at the image shown
What does this image represent?
1.Linear molecule with one domain
2.Linear molecule with two domains
3.Tetrahedral molecule with four domains
4.Trigonal planar molecule with three domains
Answer:
The correct answer is 4
Explanation:
Boron trifluoride (BF₃) has a molecular geometry (as shown in the image in the question) referred to as trigonal planar; this is because each of the the fluorine atoms/molecules (bonded to the central boron atom) is placed in such a way that they form the three "end points"/"domains" of an equilateral triangle. Hence, the correct option is the last option.
The mole fraction of NaCl in an
aqueous solution is 0.132. What is
the weight/weight percent of NaCl in
this solution?
Molar Mass
NaCl: 58.44 g/mol
H20: 18.016 g/mol
Hint: Remember to give your answer as a percent!
The weight/weight percent(%w/w) of NaCl in solution : 33.03%
Further explanationGiven
Mole fraction of NaCl : 0.132
Required
The weight/weight percent of NaCl
Solution
1 mol solution : 0.132 mol NaCl + 0.868 mol H₂O
mass NaCl :
[tex]\tt 0.132\times 58.44 g/mol=7.714~g[/tex]
mass H₂O :
[tex]\tt 0.868\times 18.016~g/mol=15.64~g[/tex]
Total mass = 7.714 + 15.64 = 23.354 g
[tex]\tt \%NaCl=\dfrac{7.714}{23.354}\times 100\%=33.03\%[/tex]
What is the electron configuration of an isolated Cl atom? Express your answer in condensed form in order of increasing orbital energy as a string without blank space between orbitals. For example, [He]2s22p2 should be entered as [He]2s^22p^2.
Answer: [tex][Ne]3s^23p^5[/tex]
Explanation:
Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom.
The electrons are filled according to Afbau's rule in order of increasing energies . Chlorine atom has 17 atomic number of 17 and has 17 electrons. The nearest noble gas is Neon with 10 electrons and thus the electronic configuration in terms of noble gas is:
[tex]Cl:17:[Ne]3s^23p^5[/tex]
Which one of the following forms an ionic bond with Chlorine?
i think its B ........
Predict whether each substance will dissolve in water.
Answer:
Dissolves in water
Explanation:
The mass spectra of alcohols often fail to exhibit detectable M peaks but instead show relatively large _____ peaks?A) M+1
B) M+2
C) M-16
D) M-17
E) M-18
Answer:
E) M-18
due to the loss of water
If 280cm3 of hydrogen diffuses in 40secs, how long will it take for 490cm3 of a gas x, whose vapor density is 25 to diffuse under the same condition (RMM hydrogen =2)
The time taken by gas x : 350 s
Further explanationGraham's law: the rate of effusion of a gas is inversely proportional to the square root of its molar masses or
the effusion rates of two gases = the square root of the inverse of their molar masses:
[tex]\rm \dfrac{r_1}{r_2}=\sqrt{\dfrac{M_2}{M_1} }[/tex]
Molar mass = 2 x vapour density(VD)
r₁=rate Hydrogen = 280 cm³ / 40 s = 7 cm³/s
M₁=molar mass Hydrogen=2 g/mol
M₂=molar mass gas x=
[tex]\tt 2\times VD=2\times 25=50~g/mol[/tex]
[tex]\tt \dfrac{7}{r_2}=\sqrt{\dfrac{50}{2} }\\\\\dfrac{7}{r_2}=5\\\\r_2=1.4~cm^3/s[/tex]
[tex]\tt r_2=\dfrac{V_2}{t_2}\\\\t_2=\dfrac{V_2}{r_2}\\\\t_2=\dfrac{490~cm^3}{1.4~cm^3/s}\\\\t_2=350~s[/tex]
please answer I need help
Answer:
i dont uderstand collage
Explanation:
tough
After the first steps in writing an equation, the equation is balanced by
Answer:
law of conservation of mass
Explanation:
self explanatory
After the first steps in writing an chemical equation, the equation is balanced by adding coefficients so that law of conservation of mass is obeyed.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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A solution of HCl with a volume of 25.00 mL is titrated to the endpoint, with 0.250 M
NaOH. If it takes 34.56 mL of NaOH, what is the original concentration of HCl in the
solution?
HCl(aq) + NaOH(aq) → H20(l)+ NaCl(aq)
Answer:
[tex]0.3456\ \text{M}[/tex]
Explanation:
[tex]V_1[/tex] = Volume of NaOH = 34.56 mL
[tex]V_2[/tex] = Volume of HCl = 25 mL
[tex]M_1[/tex] = Concentration of NaOH = 0.25 M
[tex]M_2[/tex] = Concentration of HCl
When endpoint is reached the number of moles of NaOH will be equal to the number of moles of HCl
[tex]M_1V_1=M_2V_2\\\Rightarrow M_2=\dfrac{M_1V_1}{V_2}\\\Rightarrow M_2=\dfrac{0.25\times 34.56}{25}\\\Rightarrow M_2=0.3456\ \text{M}[/tex]
Concentration of HCl is [tex]0.3456\ \text{M}[/tex].
If equal masses of each substance absorb the same amount of heat, which substance undergoes the greatest temperature change
Answer:
See explanation
Explanation:
The heat capacity of a substance is determined by the chemical composition of the substance and its mass.
Now, if substances have equal masses, the substance with the lesser heat capacity undergoes the greater temperature change.
Hence, among the substances, the particular one with the lowest heat capacity is expected to undergo the greatest temperature change.
If equal masses of each substance absorb the same amount of heat, the substance which undergoes the greatest temperature change is: the one with the lowest specific heat capacity.
Specific heat capacity can be defined as the quantity of heat required to raise the temperature of a physical object or body per unit mass, by one degree Celsius (1°C) or one Kelvin (1 K).
This ultimately implies that, specific heat capacity is the quantity of heat absorbed or released per unit mass of a substance when its temperature increases by one degree Celsius (1°C) or one Kelvin (1 K).
Mathematically, the quantity of heat is given by the formula;
[tex]Q = mc\theta[/tex]
Where:
Q represents the quantity of heat.m represents the mass of an object.c is the specific heat capacity.[tex]\theta[/tex] is the change in temperature.Making [tex]\theta[/tex] the subject of formula, we have:
[tex]\theta = \frac{Q}{mc}[/tex]
Deductively, a substance undergoes the greatest temperature change when its specific heat capacity is lowest and its mass remains constant.
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how are all paths that have displacement of zero similar
Answer:
Any situation that has a path that stops at the same position that it started from has a displacement of zero.
Explanation:
Answer:
As long as they end in the same position as they started in they are considered to have a displacement of zero.
Explanation:
ily
How many water molecules are in 4 moles of water
Answer:
12.
Explanation:
There are 12 atoms within 4 water molecules.
Write a resonance form for pyrrole in which nitrogen has a formal charge of 1. Are comparable resonance forms possible for pyridine
Answer:
See explanation and image attached
Explanation:
Here attached are resonance forms of pyrrole and pyridine. The images were obtained from quora and researchgate respectively.
Now, we can see that in the resonance forms of pyrrole, the nitrogen atom in the heterocycle has a formal charge of +1. However, in the six membered pyridine hetrocycle, the nitrogen atom may have a formal charge of -1 or +1 as shown in the canonical structures attached. The structures in which nitrogen has a +1 formal charge in pyridine are comparable to structures obtained from pyrrole. These structures have less contribution to the structure of pyridine.
How many mL of 0.2860 M sulfuric acid are required to react with 58.42 mL of 0.09756 M iron(III) hydroxide
Answer:
0.05978 mL of 0.2860 M sulfuric acid is required to react with 58.42 mL of 0.09756 M iron (III) hydroxide.
Explanation:
The balanced reaction between tha surfuric acid and iron (III) hydroxide is:
Fe(OH)₃ + 3 H₂SO₄ → Fe(HSO₄)₃ + 3 H₂O
By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of reactants and products participate in the reaction:
Fe(OH)₃: 1 mole H₂SO₄: 3 molesFe(HSO₄)₃: 1 mole H₂O: 3 molesBeing molarity (M) the number of moles of solute that are dissolved in a given volume:
[tex]Molarity=\frac{number of moles}{volume}[/tex]
then the number of moles can be calculated as:
number of moles= molarity* volume
So, if 58.42 mL ( 0.05842 L) of 0.09756 M iron (III) hydroxide react, then it means that the number of moles that react are:
number of moles= 0.09756 M* 0.05842 L
number of moles= 0.005699 moles
Now it is possible to apply the following rule of three: if by stoichiometry 1 mole of Fe(OH) ₃ reacts with 3 moles of H₂SO₄, then 0.005699 moles of Fe(OH) ₃ with how many moles of H₂SO₄ does it react?
[tex]moles of H_{2} SO_{4} =\frac{0.005699 moles ofFe(OH)_{3}* 3moles of H_{2} SO_{4} }{1mole ofFe(OH)_{3}}[/tex]
moles of H₂SO₄= 0.017097
Being sulfuric acid 0.2860 M, it is replaced in the definition of molarity:
[tex]0.2860M=\frac{0.017097 moles}{volume}[/tex]
Solving for the volume:
[tex]volume=\frac{0.017097 moles}{0.2860 M}[/tex]
volume= 0.05978 mL
0.05978 mL of 0.2860 M sulfuric acid is required to react with 58.42 mL of 0.09756 M iron (III) hydroxide.
