NO- (isoelectronic or same as O2) is hard base
H+ is hard acid
bonding depends which pi* has more electron density and calc shows more on N...hence HNO is more likely (bent) molecule
whatever....
You have an atom with 17 protons, 18 neutrons, a net charge -1, and a mass of 35. How many electrons does this atom have?
Answer:
this atom have 18 electronsExplanation:
we know that in nutral state of atom , an atom have equal number of protons and electrons ,but in this question this atom is not nutral means it is charged this atom have -1 charge this means it gains 1 electron .in nutral state if an atom have equal number of proton and electron when the atom is charged(gain or lost certain amount of electron) number of electron become proton -the electron it losts or proton + the electron it gainsthis atom have -1 charge this means it gains 1 electron so the number of electron calculated by ; proton + the number of electron it gains; this atom have 17 protons so , number of electron =17+1=18there fore this atom have 18 electrons. I think its helpful for youIs halogen radioactive
Answer: yes
Explanation:
how many grams are present in 0.885 moles of manganese?
A. 48.6g
B. 62.1 g
C. 27.5 g
D. 0.016g
E. 21.5g
As per the details given, 48.6 g are present in 0.885 moles of manganese. The correct option is A.
To determine the gram contained in a given number of moles, use the element's molar mass. Manganese (Mn) has a molar mass of roughly 54.94 g/mol.
To calculate the grammes in 0.885 moles of manganese, use the following formula:
moles of Mn × molar mass of Mn = mass of Mn in grams
On calculating it:
0.885 moles × 54.94 g/mol = 48.60 g
Therefore, the mass of manganese present in 0.885 moles of manganese is 48.60 grams.
Thus, the correct answer is A. 48.6g.
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What mass of carbon dioxide is produced from the complete combustion of 4.60x10^-3g of methane?
Answer:
Explanation:
CH4 + 2O2 ==> CO2 + 2H2O
mols CH4 = grams/molar mass
Using the coefficients in the balanced equation, convert mols CH4 to mols CO2.
Now convert mols CO2 to grams. g = mols x molar mass.
When 3.93 grams of lactic acid, CHoOs(s), are burned in a bomb
calorimeter that has a total heat capacity of 10.80 kJ-K-1, the
temperature of the calorimeter increases by 5.43 K. Assume AHrxn
=
AErxn. Given that AH°f of H¿O(I) = -285.8 kJ-mol-1 and AH°f of CO:(g)
= -393.5 kJ• mol-1, calculate the AH°f of lactic acid.
The heat released in the combustion of lactic acid is absorbed by the
calorimeter and in the decomposition of the lactic acid.
ΔH°f of lactic acid is approximately -716.2 kJ
Reasons:
Known parameters are;
Mass of the lactic acid = 3.93 grams
Heat capacity of the bomb calorimeter = 10.80 kJ·K⁻¹
Change in temperature of the calorimeter, ΔT = 5.34 K
ΔHrxn = ΔErxn
ΔH°f of H₂O(l) = -285.8 kJ·mol⁻¹
ΔH°f of CO₂(g) = -393.5 kJ·mol⁻¹
The chemical equation for the reaction is presented as follows;
C₃H₆O₃ + 2O₂ → 3CO₂ + 3H₂OThe heat of the reaction = 10.80 kJ·K⁻¹ × 5.34 K = 57.672 kJ
Molar mass of C₃H₆O₃ = 90.07 g/mol
Number of moles of C₃H₆O₃ = [tex]\dfrac{3.93 \, g}{90.07 \, g/mol}[/tex] = 0.043633 moles
Number of moles of CO₂ produced = 3 × 0.043633 moles = 0.130899 moles
Heat produced = 0.130899 mole × -285.8 kJ·mol⁻¹ = -37.4109342 kJ
Moles of H₂O produced = 0.130899 moles
Heat produced = 0.130899 mole × -393.5 ≈ -51.51 kJ
Therefore, we have;
Heat absorbed by the lactic acid = ΔH°f of H₂O + ΔH°f of CO₂ + Heat absorbed by the calorimeter
Which gives;
Heat absorbed by lactic acid = -37.4109342 kJ - 51.51 kJ + 57.672 kJ ≈ -31.249 kJ
The heat absorbed by the lactic acid ≈ -31.249 kJ
[tex]\Delta H^{\circ}f \ of \ C_3H_6O_3 = \dfrac{-31.249}{0.043633} \approx -716.2[/tex]
ΔH°f of C₃H₆O₃ ≈ -716.2 kJ
Heat of formation of lactic acid ≈ -716.2 kJ.
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Muối sunfua với hidro sunfua có giống nhau về tính chất vật lý không ạ. Ứng dụng và điều chế muối sufua như thế nào ạ
the answer is is is is is is is is is is is is is is
If you take 35 mL of solution from (#2c) and add 0.225 L of water what is the concentration of the resulting solution in (% v/v)? (hint: you must determine the final volume first)
HELP
We want to find the concentration of the resulting solution of mixing 35mL of a given solution and 0.225 L of water.
We will find that the concentration is 13.5%.
First, we need to write both of these in the same units.
We know that:
1000 mL = 1L
Then:
35 mL = 0.035 L
So when we mix the solution and the water we end with a total volume of:
V = 0.035L + 0.225L = 0.260L
The concentration of solution will be equal to the quotient between the volume of solution we used (0.035 L) and the total volume of the mixture (0.260L)
We will get:
Concentration = (0.035L)/(0.260L) = 0.135
Now to write it as a percentage, we only need to multiply this by 100%.
0.135*100% = 13.5%
This means that the mixture has a concentration of the 13.5%.
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why does exercising causes the change in our body ( breathing/heart rate)
Answer:
Explanation:
The biggest change in the body caused by regular exercise is to muscle tissue. ... At the cellular level, exercise triggers the release of substances that dilate the blood vessels in the muscle, letting in more oxygen, says Prof Bradford. These are short-term effects, but deeper changes come with regular exercise.
Exercising causes changes in our body because we're working our muscles so there's more going on with us compared to when we're just laying down. We need more oxygen to go to our muscles so we breathe harder and more rapidly. Our heart also beats faster because it needs to pump more blood to the muscles that are being worked.
EXPLAIN BRIEFLY WHY CHEMISTRY IS CONSIDERED AS MAJOR BRANCH OF SCIENCE
Answer:
Chemistry is sometimes called “the central science,” because it bridges physics with other natural sciences, such as geology and biology. Chemistry is the study of matter and its properties.
Explanation:
~found it~
4. The cup is a volume widely used by cooks in the UAE. One cup is equivalent to 237 mL.
a. If 1 cup of olive oil has a mass of 216 g, what is the density of olive oil in kg/mL?
b. Convert the density from part A to kg/mL. Write your answer in scientific notation.
Taking into account the definition of density and scientific notation, the density of olive oil is 0.000911 [tex]\frac{kg}{mL}[/tex] or 9.11×10⁻⁴[tex]\frac{kg}{mL}[/tex]
Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.
In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance. That is, density is the relationship between the weight (mass) of a substance and the volume it occupies.
The expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
[tex]density=\frac{mass}{volume}[/tex]
In this case, you know that:
mass= 216 g= 0.216 kg (being 1000 g= 1 kg)volume= 237 mLReplacing in the definition of density:
[tex]density=\frac{0.216 kg}{237 mL}[/tex]
Solving:
density= 0.000911 [tex]\frac{kg}{mL}[/tex]
On the other side, scientific notation is a quick way to represent a number using powers of base 10.
The numbers are written as a product:
a×10ⁿ
where:
a is a real number greater than or equal to 1 and less than 10, to which a decimal point is added after the first digit if it is a non-integer number. n = a whole number, which is called an exponent or an order of magnitude. Represents the number of times the point decimal is shifted. It is always an integer, positive if it is shifted to the left, negative if it is shifted to the right.In this case, the density expressed in scientific notation is: 9.11×10⁻⁴[tex]\frac{kg}{mL}[/tex]
In summary, the density of olive oil is 0.000911 [tex]\frac{kg}{mL}[/tex] or 9.11×10⁻⁴[tex]\frac{kg}{mL}[/tex]
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about density: brainly.com/question/952755?referrer=searchResults brainly.com/question/1462554?referrer=searchResultsscientific notation: brainly.com/question/18073768?referrer=searchResultsPlease answer question (e)
Answer:
here is no question (e).............
What energy keeps the water cycle going?
Answer:
the the that keeps the water cycle going is heat
how many number of atoms are present in 0.55moles of calcium
Explanation:
The warmer and less dense air near the ground rises during the day pulling more air through the valley floor. This gentle upslope wind known as a valley breeze. ... The cooler and denser air at higher elevations flows back down the slopes of the mountain and into the valley. This is called a mountain breeze.29-May-2017

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A mountain breeze and a valley breeze are two related, localized winds that occur one after the other on a daily cycle. They are not the same as anabatic and katabatic winds, which are larger and stronger. These winds are opposite from each other. Wikipedia
state why vulcanologist make predications about when a volcano will erupt
Answer:
They want to know how long it has been since it last erupted.
Explanation:
Scientists study a volcano's history to try to predict when it will next erupt. They also want to know the time span between its previous eruptions
A 623 ml sample of gas at STP is allowed to expand (like the universe) until it
occupies a volume of 1200 ml, What temperature would be needed to return the
gas to standard pressure? (all trying to find some equilibrium)
P
T
V
Initial latm
623
Final
loton
Effect
고
212
Yoo
&
a. What variables are constant? (NOT CHANGING!)
How many moles of Magnesium(Mg) are
in 2.46 x 10^28 atoms of Magnesium?
so 2.46 X 10^28 contains (2.46 X 10^28)/(6.02 X 10^23) =
(2.46 X 10 X 10^27)/ (6.02 x(10^23) = (24.6/6.02) X 10^ (27-23)=
4.09 X 10^4 = 40,900
Answer:
4.09 X 10^4 = 40,900 moles
Explanation:
How many moles of Magnesium(Mg) are
in 2.46 x 10^28 atoms of Magnesium?
PLEASE LEARN THIS FUNDAMENTAL RULE OF CHEMISTRY...1 MOLE OF ANYTHING CONTAINS AVOGADROS NUMBER OF PARTICLES}
6.02 X 10^23.09
so 2.46 X 10^28 contains in moles(2.46 X 10^28)/(6.02 X 10^23) =
(2.46 X 10 X 10^27)/ (6.02 x(10^23) = (24.6/6.02) X 10^ (27-23)=
4.09 X 10^4 = 40,900 moles
Pls help I don’t understand: Which of these is a balanced chemical reaction?
A) CO + O2–>CO2
B) CO + 2O2–> 2CO2
C) 2CO + O2—> 2CO2
D) 2CO + 2O*small 2 not 202*—> 2CO2
Answer:
C) 2CO + O₂ → 2CO₂
Explanation:
The equation C is correct.
2CO + O₂ → 2CO₂
This equation have four oxygen atom and two carbon atoms on both side of equation. So it is correctly balanced.
All others are incorrect:
A) CO + O₂ → CO₂
this is incorrect because there are three oxygen atoms on left while two atoms on right.
B) CO + 2O₂ → 2CO₂
this is incorrect because there are five oxygen atoms on left while four atoms on right.
D) 2CO + 2O₂ → 2CO₂
this is incorrect because there are six oxygen atoms on left while four atoms on right.
helpppppppppppppppppppppppppppp
Answer:
condensationExplanation:
Condensation is a process in which the evaporated liquid substance such as water vapor gets turned back to its liquid form water.
So, condensation is the process in which water vapor changes to liquid .Can water molecules form ions by
themselves?
Determine the total mass of 5 moles of CuSO4.5H2O
Answer:
Answer: 1247.5 grams
Explanation:
explanation on image .
The water in a fishery became polluted when toxic waste was dumped into its pond, causing the fish population to substantially decline. The percents of fish that survived are recorded in the table.
Day 1 2 3 4 5
% Survival 79 55 38 31 19
a) What is the order of the reaction live fish ------> dead fish?
b) What is the rate constant?
c) If the fish continue to die at this rate, how many fish will be alive after 10 days?
In the pond, the percentage of fish left after ten days is 4%.
Given that;
N(t) = Noe^-kt
Where;
N(t) = percentage of fish at time t
No = Initial percentage of fish
k = rate constant
t = time taken
Given that we had 100% fish population at the beginning, we can see that this reaction is first order.
The rate constant is obtained from;
When t = 5
19 = 100e^-5k
19/100 =e^-5k
0.19 = e^-5k
ln 0.19 = -5k
k = ln (0.19)/-5
k = 0.33
In ten days;
N(10) = 100e^-0.33(10)
N(10) = 4%
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600.0 ml of a 0.385 M solution of LiCl is diluted to 900.0 ml. What is the new concentration of the solution.
Taking into account the definition of dilution, the new concentration of the solution is 0.2567 M.
First of all, you have to know that dilution is the reduction in concentration of a chemical in a solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.
In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volumeof the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where
Ci: initial concentration Vi: initial volume Cf: final concentration Vf: final volume
In this case, you know:
Ci= 0.385 M Vi= 600 mL= 0.600 L (being 1000 mL= 1 L) Cf= ? Vf= 900 mL= 0.900 LReplacing in the definition of dilution:
0.385 M× 0.600 L= Cf× 0.900 L
Solving:
Cf= (0.385 M× 0.600 L)÷ 0.900 L
Cf= 0.2567 M
In summary, the new concentration of the solution is 0.2567 M.
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brainly.com/question/20113402?referrer=searchResults brainly.com/question/22762236?referrer=searchResultsSelect the statements that correctly describe an asteroid. Check all that apply
Largest of the space rocks found orbiting the Sun.
Smallest of the space rocks found orbiting the Sun.
most are found between Mars and Jupiter
most are found between Jupiter and Saturn
Answer:
Explanation:
Most of this ancient space rubble can be found orbiting the Sun between Mars and Jupiter within the main asteroid belt. Asteroids range in size from Vesta – the largest at about 329 miles (530 kilometers) in diameter – to bodies that are less than 33 feet (10 meters) across.
Colligative properties are dependent only on the number of particles in a solution, and not their identity. (select all that apply) Select one or more: a. Acidity b. Depression of freezing point c. Lowering of vapor pressure d. Osmotic pressure e. Elevation of boiling point f. Mortality g. Value h. Molarity
These colligative properties include reduced vapor pressure, increased boiling point, decreased freezing point, and increased osmotic pressure.
What do you mean by osmotic pressure?When a semipermeable membrane separates a solution from pure water, osmotic pressure is defined as the pressure that must be applied to the solution side to stop fluid movement.These colligative properties include reduced vapor pressure, increased boiling point, decreased freezing point, and increased osmotic pressure. As described in this module, this small set of properties is critical to many natural phenomena and technological applications.The pressure required to prevent water from diffusing through a membrane via osmosis is known as osmotic pressure. The concentration of the solute determines it. Water diffuses from the lower concentration area to the higher concentration area.Osmotic pressure is a 'colligative' property, like freezing point depression, which means that it depends on the number of particles in solution but not on their chemical identity.To learn more about : Osmotic pressure
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highlight main approaches that could be used to investigate the waterer Quality.
Answer:
Seven methods were used to assess water quality in the river system. These methods included single-factor assessment, water quality grading, comprehensive pollution index, the Nemerow pollution index, principle component analysis, fuzzy comprehensive evaluation, and comprehensive water quality identification index.
60) Which of the following is a chemical property?
A) Sugar is a solid at room temperature.
B) Potassium reacts with water to form potassium hydroxide.
C) Sugar dissolves in water.
D) Gasoline and water do not mix.
.
Answer:
C is the answer. Sugar Dissolves in water
Explanation:
Brainliest Maybe
Sugar dissolves in water is a chemical property. Therefore, option C is correct.
What do you mean by chemical properties ?Chemical properties describe a substance's characteristic ability to react to form new substances; they include flammability and corrosion susceptibility. A pure substance's chemical and physical properties are the same in all samples.
A chemical property is the ability or inability to change one type of matter into another. Chemical properties include flammability, toxicity, acidity, reactivity, and heat of combustion.
A chemical property explain the ability of a substance to undergo a specific chemical change. To verify a chemical property, we look for a chemical change.
Thus, Sugar dissolves in water is a chemical property, option C is correct.
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Calculate the average kinetic energies of CH4g and N2 g molecules at 273 K and 546K
Answer:
Average kinetic energy of gases, which is derived from the RMS (root mean square speed) and KE equation, can be solved as:
It appears that the average KE of gases is dependent on the temperature which means that all gases will have the same KE as long the temperature is the same
What is the main component of natural gas
Answer:
I believe that would be methane! I hope this helps you!
Answer:
methane
Explanation:
The largest component of natural gas is methane, a compound with one carbon atom and four hydrogen atoms (CH4). Natural gas also contains smaller amounts of natural gas liquids (NGL, which are also hydrocarbon gas liquids), and nonhydrocarbon gases, such as carbon dioxide and water vapor.The main component in natural gas is methane. It also has ethane, propane, butane, hydrocarbons.
2.When copper (II) nitrate reacts with sodium hydroxide, copper (11) hydroxide is produced.
How many grams of copper (11) hydroxide can be prepared from 2.7 g of copper (II) nitrate
reacting with sodium hydroxide?
Answer:
2Cu + S ~~~> Cu2S Copper (C) reacts with sulfur (S) to form copper sulfide as shown in the equation. A scientist adds 12.7 grams of Cu to 3.2 grams of S to start the reaction.
Explanation:
Two carbon atoms (Group 14) bond with two hydrogen atoms (Group 1) to form acetylene (C2H2). How would each carbon atom in acetylene bond?(1 point)
A) Each carbon atom would share one pair of electrons with hydrogen and three pairs with the other carbon atom.
B) Each carbon atom would share one pair of electrons with hydrogen and one pair with the other carbon atom.
C) Each carbon atom would share one pair of electrons with the other carbon atom and three pairs with each hydrogen atom.
D) Each carbon atom would share one pair of electrons with the other carbon atom and two pairs with each hydrogen atom.