Answer: Br is the answer to the question.
When an animal eats corn or peanuts, will it also eat the seeds?
Answer:yes
Explanation:it doesnt know
What volume, IN MILLILITERS, of 5.0M HCl solution is required to react with 3.00 g or magnesium metal?
The volume of HCl = 2.10⁴ mL
Further explanationGiven
5.0 M(mol/L) HCl solution
3 g of Mg
Required
Volume of HCl
Solution
Reaction
Mg + 2HCl ⇒ MgCl₂ + H₂
mol of Mg (Ar=24 g/mol) :
mol = mass : Ar
mol = 3 : 24
mol = 0.125
From the equation, mol ratio of Mg : HCl = 1 : 2, so mol HCl :
= 2/1 x mol Mg
= 2 x 0.125
= 0.25
Molarity : mol solute per liters solution
M = m x V
V = M : m
V = 5 mol/L : 0.25
V = 20 L = 2.10⁴ mL
What is the percent composition of silicon dioxide, SiO2 ? (Atomic masses : O = 16 . 0 Si =28 .1
Answer:
60.1 i think
Explanation:
A certain electromagnetic wave has a wavelength of 6.25 x 10-7m. What is the
frequency of the wave?
Answer: 4.80 * 10¹⁴s⁻¹
Explanation:
Speed = Frequency * Wavelength
So:
Frequency = Speed/ Wavelength
Speed of light = 3 * 10⁸ m/s
Frequency = (3 * 10⁸ m/s) / (6.25 x 10⁻⁷m)
= 4.80* 10¹⁴hz
= 4.80 * 10¹⁴s⁻¹
The frequency of the electromagnetic wave is 4.8 x 10¹⁴s⁻¹
In an Electromagnetic wave, The frequency , speed and wavelength of an are related by the formula
λ= c/f
where
λ = wavelength in metres, m.
c= speed of light in metres per sec, m/s
f= frequency in per seconds or hertz,( s⁻¹ , Hz)
Given that Wavelength of the electromagnetic wave is 6.25 x 10-7m.
We know that speed of light is 3 x 10⁸ m/s
Substituting the values into the equation becomes
f = c/ λ
f= 3 x 10 ⁸m /s / 6.25 x 10⁻⁷ m = 4.8 x 10¹⁴s⁻¹
Hence, The frequency of the electromagnetic wave is 4.8 x 10¹⁴s⁻¹
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In the Lewis symbol for a sulfur atom, there are __________ paired and __________ unpaired electrons. A) 2, 2 B) 4, 2 C) 2, 4 D) 0, 6 E) 5, 1 Answer: B
Answer:
C) 2, 4.
Explanation:
Hello!
In this case, since the sulfur atom has six electrons at its outer shell, it suggests it needs to gain two electrons in order to attain a complete octet, that is why it has 2 paired electrons.
Moreover, since two electrons are paired, then 4 electrons will remain unpaired; therefore the answer would be C) 2, 4.
Best regards!
A landscape in Antarctica has an area of 500,000 square miles. It is covered with ice, giving the landscape an average elevation of 7520 feet. Without the ice, it is estimated the landscape would have an average elevation of 1500 ft. The average density of the ice is 0.917 g/mL. How many tonnes of ice cover that landscape?
Answer:
m = 2.18x10¹⁵ tons of ice
Explanation:
To solve this exercise, we need to work with the same units of conversion. In this case let's see the conversion of every unit here:
1 mi = 5280 ft
1 ton = 1000 kg
1 kg = 1000 g
1 mL = 1 cm³
1 mi = 1609.34 m or 160,934 cm
Now that we know the units, let's analyze the data.
The landscape has a 500,000 mi² of area, this is however without including the ice. The ice is apart, and has a 7520 ft of height. And if the landscape wouldn't have ice, then the height will be 1500 ft only.
With that data, we can know the actual height of the ice by a simple difference:
Hi = Hli - Hl
Where:
Hi: Height of ice
Hli: Height of ice + landscape
Hl: Height of landscape
Applying this expression, the height of ice is:
Hi = 7520 - 1500 = 6020 ft of ice
Now that we know the height of the ice, we can calculate the volume of whole landscape. But first, let's do the conversion of foot to mile:
Hi = 6020 ft * (1 mi/5280 ft) = 1.14 mi
And now, let's calculate the volume of the landscape in mile, and then, to centimeter:
V = 1.14 mi * 500,000 mi² = 570,000 mi³
To convert the cubic mile to cubic centimeter we just do the following:
V = 570,000 mi³ * (160934 cm / 1 mi)³ = 2.38x10²¹ cm³
Now, we can get the mass of the ice using the given density of ice (d = 0.917 g/cm³)
If d = m/V
then m = d * V
Replacing the data:
m = 0.917 g/cm³ * 2.38x10²¹ cm³
m = 2.18x10²¹ g
Finally, the tons of ice will be:
m = 2.18x10²¹ g * (1 kg / 1000 g) * (1 ton / 1000 kg)
m = 2.18x10¹⁵ tons of iceHope this helps
What does a mountain ecosystem host?
A. one ecosystem with a variety of wildlife
B. one ecosystem with a variety of plants
C. three or more ecosystems which can’t host plant life
D. three or more distinct ecosystems
Answer: D.
Explanation: :)
Answer:
d
Explanation:
Calculate the number of grams of solid aluminium chloride that will form when a mixture containing 0.150 g of aluminum powder and 1.00 g of chlorine gas is allowed to react.
2Al (s) + 3Cl2 (g) ---> 2AlCl3 (s)
a. 741 g AlCl3
b. 471 g AlCl3
c. 0.741 g AlCl3
d. 246 g AlCl3
Answer:
the answer is B:) have a good day
A chemist determined by measurements that 0.030 moles of barium participated in a chemical reaction. Calculate the mass of barium that participated in the chemical reaction. Round your answer to 2 significant digits.
Answer: 4.1 g of barium precipitated.
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar Mass}}[/tex]
Given : moles of barium = 0.030
Molar mass of barium = 137 g/mol
[tex]0.030=\frac{x}{137}[/tex]
x= 4.1 g
Thus there are 4.1 g of barium that precipitated.
There are three isotopes of X element (X):
X-17 isotope: atomic mass17.2 amu, abundance:78.99%
X-18isotope: atomic mass 18.1 amu, abundance 10.00%
X-19isotope: atomic mass:19.1 amu, abundance: 11.01%
Calculate the average atomic mass of X.
Answer:
Average atomic mass = 17.5 amu.
Explanation:
Given data:
X-17 isotope = atomic mass17.2 amu, abundance:78.99%
X-18isotope = atomic mass 18.1 amu, abundance 10.00%
X-19isotope = atomic mass:19.1 amu, abundance: 11.01%
Average atomic mass of X = ?
Solution:
Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) + (abundance of 3rd isotope × its atomic mass) / 100
Average atomic mass = (78.99×17.2)+(10.00×18.1) +(11.01+ 19.1) /100
Average atomic mass = 1358.628 + 181 +210.291 / 100
Average atomic mass = 1749.919 / 100
Average atomic mass = 17.5 amu.
Analysis of a salt results in the following composition: 3.47 g of Sodium; 2.12 g of Nitrogen; and 7.27 g of Oxygen. What is the simplest formula for this salt
Answer:
NaNO₃
Explanation:
Data obtained from the question include:
Mass of sodium (Na) = 3.47 g
Mass of nitrogen (N) = 2.12 g
Mass of oxygen (O) = 7.27 g
Simplest (empirical) formula =?
The simplest formula for the salt can be obtained as follow:
Na = 3.47 g
N = 2.12 g
O = 7.27 g
Divide by their molar mass
Na = 3.47 / 23 = 0.151
N = 2.12 / 14 = 0.151
O = 7.27 / 16 = 0.454
Divide by the smallest
Na = 0.151 / 0.151 = 1
N = 0.151 / 0.151 = 1
O = 0.454 / 0.151 = 3
Simplest formula = NaNO₃
Thus, the simplest formula for the salt is NaNO₃
Triangle K L J. Side K L is 23.1 feet, J L is 20.1 feet, J K is 16.8 feet. Angle K is 58 degrees, L is 45 degrees, J is 77 degrees. Triangle E F G. Side E F is 6.7 feet, F G is 5.6 feet, G E is blank. Angle E is 45 degrees, F is 77 degrees, G is 58 degrees.
Given these similar triangles, what is the common ratio of triangle LJK to triangle EFG?
1.5
2
3
4
the answer is 3
"C"
Answer:
The answer is C or 3
Explanation:
I took the assignment
Answer:
3 or C on edge
Explanation:
Which of the following is most likely to produce heat energy?
A
Momentum
B
Convection
C
Interaction
D
Magnetism
Answer:
B.Convection
the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat.
Answer:
B.
Explanation:
what is the similaritu of chicken skin to human skin?
Answer:
Explanation:
12.9 micrograms of iodine in both
Answer quick please
Answer:
In my perspective I think its D because Electrical energy is converted to light and heat
A mixture can be separated into simpler parts based on the components of the mixture's _____ properties.
volatile
reaction
physical
chemical
Answer:
Chemical is best answer
Explanation:
Mark me as brilliant and thank you
Please
Answer:
chemical is the answer
Explanation:
The rate law for the decomposition of phosphine () is It takes 135. s for 1.00 M to decrease to 0.250 M. How much time is required for 3.00 M to decrease to a concentration of 0.450 M
Answer:
189.71 secs
Explanation:
We know that decomposition is a first order reaction;
So;
ln[A] = ln[A]o - kt
But;
[A]o = 1.00 M
[A] = 0.250 M
t =135 s
Hence;
ln[A] - ln[A]o = kt
k = ln[A] - ln[A]o/t
k = ln(1) - ln(0.250)/135
k =0 - (-1.386)/135
k = 1.386/135
k= 0.01
So time taken now will be;
ln[A] - ln[A]o = kt
t = ln[A] - ln[A]o/k
t = ln (3) - ln(0.450)/0.01
t = 1.0986 - (-0.7985)/0.01
t = 1.0986 + 0.7985/0.01
t = 189.71 secs
can u pls help me with this question
Answer:
it's mass
Explanation:
just trust me it's just mass
A chemist must dilute 97.1 ml of aqueous magnesium fluoride solution until the concentration falls to 389 microMolarity . He'll do this by adding distilled water to the solution until it reaches a certain final volume. Calculate this final volume, in liters. Round your answer to significant digits.
Answer:
0.302L
Explanation:
...97.1mL of 1.21m M aqueous magnesium fluoride solution
In this problem the chemist is disolving a solution from 1.21mM = 1.21x10⁻³M, to 389μM = 389x10⁻⁶M. That means the solution must be diluted:
1.21x10⁻³M / 389x10⁻⁶M = 3.11 times
As the initial volume of the original concentration is 97.1mL, the final volume must be:
97.1mL * 3.11 = 302.0mL =
0.302L
Which atom has multiple oxidation states and
forms an ion that is colored when in solution?
A) F
B) Zn
C) C1
D) Cu
Answer:
Copper
Explanation:
PLEASE HELP!! PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP’
LEWIS STRUCTURES CHEMISTRY!
Answer:
B is the answer because it doesn't matches the num of valence electrons
Answer:
No, because it doesn't match the total number of valence electrons.
Explanation:
The total valence electrons should be 10. But if you add all the valence electrons it gives you 12
Write as a single exponent in simplest form: y⁸×y⁵
Answer:
y¹³
Explanation:
because it's a multiplication question we add exponents
8 + 5 = 13
so it's y¹³
In 2011, the number of transplants in the United States was 26,745, and the number of donors was 14,146. What is most likely the reason that there were more transplants than donors? The data that were used for comparison was not compatible. O The data were not recorded accurately There were retransplants done. © Each donor gave away more than one organ.
Answer:
Each donor gave away more than one organ.
Explanation:
edge 2021
Answer: D
Explanation:
what statements best describe the work of marie and pierre curie? check all that apply
Answer:
Discovered two new radioactive elements They came up with the term radio activity.conducted experiments with uranium-containing
Explanation:
What is the percent composition of oxygen in
beryllium nitrate, Be(NO3)2?
The percent composition of oxygen in beryllium nitrate, Be(NO3)2 is 72.166%.
What is percent composition ?
Percent composition is very straightforward. Percent composition indicates the percentage of each element in a compound by mass. A chemical compound is made up of two or more elements.
Percent composition is important because it allows us to calculate the percentage of each element in a compound. Here, the quantity is measured in terms of grams of the elements present.
For example, if we know the mass and chemical composition of a substance, we can find out the number of moles and calculate the number of atoms or molecules in the sample.
In Be(NO3)2 the percent composition of Beryllium (Be) is 6.775%, Nitrogenium (N) is 21.060% and Oxygenium (O) is72.166%.
Thus, The percent composition of oxygen in beryllium nitrate, Be(NO3)2 is 72.166%.
To learn more about the percent composition, follow the link;
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gThe mole fraction of potassium nitrate in an aqueous solution is 0.0194. The solution's density is 1.0627 g/mL. What is the molarity of KNO in the solution
Answer:
0.595 M
Explanation:
The number of moles of water in 1L = 1000g/18g/mol = 55.6 moles of water.
Mole fraction = number of moles of KNO3/number of moles of KNO3 + number of moles of water
0.0194 = x/x + 55.6
0.0194(x + 55.6) = x
0.0194x + 1.08 = x
x - 0.0194x = 1.08
0.9806x= 1.08
x= 1.08/0.9806
x= 1.1 moles of KNO3
Mole fraction of water= 55.6/1.1 + 55.6 = 0.981
If
xA= mole fraction of solvent
xB= mole fraction of solute
nA= number of moles of solvent
nB = number of moles of solute
MA= molar mass of solvent
MB = molar mass of solute
d= density of solution
Molarity = xBd × 1000/xAMA ×xBMB
Molarity= 0.0194 × 1.0627 × 1000/0.981 × 18 × 0.0194×101
Molarity= 20.6/34.6
Molarity of KNO3= 0.595 M
What is the heat of a reaction, in joules, with a total reaction mixture volume of 73.0 mL if the reaction causes a temperature change of 4.4 oC in a calorimeter
This question is incomplete, the complete question is;
What is the heat of a reaction, in joules, with a total reaction mixture volume of 73.0 mL if the reaction causes a temperature change of 4.4 °C in a calorimeter?
Assume that the reaction mixture has a density of 1.00 g/mL and a specific heat of 4.184 J/g-oC. The calorimeter has a heat capacity of 10.0 J/oC.
Answer: the heat of the reaction is 1387.9 J
Explanation:
Given that;
Volume = 73.0 mL
density = 1.00 g/mL
specific heat of solution = 4.184 J/g-oC
calorimeter has a heat capacity of 10.0 J/oC.
Temperature change ΔT = 4.4 °C
the heat of a reaction = ?
Total heat of the reaction will be equal to the amount of heat absorbed/lost by the solution and the calorimeter.
so heat of reaction q = mC_solΔT + C_alΔT
where m is mass, C_sol is specific heat capacity of the solution, ΔT temperature change and C_cal is heat capacity of calorimeter.
so first we calculate our mass;
mass = volume × density
= 73.0 mL × 1.00 g/mL
= 73.0 g
so we substitute into our equation;
q = mC_solΔT + C_alΔT
q = (73 × 4.184 × 4.4) + ( 10 × 4.4 )
q = 1343.9008 + 44
q = 1387.9 J
Therefore the heat of a reaction is 1387.9 J
can u pls help me with this question
Answer:
C
Explanation:
Condensation
Answer:
C....... ...................
Plssssssssssssssss help me
Answer:
Answer is True
I hope its help for you
have a great day
What is true of a covalent bond? (4 points)
Answer:
44
Explanation:
