Answer:
75.4 g.
Explanation:
Hello there!
In this case, since the solubility stands for the maximum amount of a solute that is completely dissolved in a specific amount of solvent, typically 100 g of water as the universal solvent; we need to take into account that the higher the temperature the higher the solubility for the most of the solids.
In such a way, since the solubility of potassium bromide at 20 °C is 65.3 g per 100 g of water, at 40 °C is 75.4 g per 100 g of water, proving the aforesaid. Therefore, 75.4 g of potassium bromide will form a saturated solution with 100 g of water at 40 °C.
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Which element consists of positive ions immersed in a “sea” of mobile electrons?
A.
Sulfur
B.
Nitrogen
C.
Calcium
D.
Chlorine
Answer:
Calcium
Explanation:
Calcium is the only metal here
hope this helps...
A positive ion is an atom or a molecule that has a net positive charge. The charge of the proton in an atom or a molecule is positive.
A subatomic found in the atom or the molecule that lacks a positive charge is called an electron.
The correct answer is:
Option C. Calcium
This can be explained by:
Compounds or substances which have positive ions engaged in a sea of movable electrons are assumed to be metals.The electrons existing in the metals encompass the positively loaded nuclei instead of projecting their assigned atoms.Calcium is the only metal found in the given list and hence is the answer.
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snow and ice absorbs much of the Sun's radiant energy
True or False?
Answer with "True" Or "False" please, thank you.
Answer: True
Explanation: I have done this before but I hope this helps.
PLEASE HELP with these problems ASAP!!! 30 points!!
Answer:
which?........................
When relative humidity is at 100 percent, air is said to be what?
Answer:
Fully saturated or "a chance of rain"
Explanation:
When relative humidity reaches 100%, the air is fully saturated with vapor. That means that there is a possibility of rain.
Why are salt solutions not used to treat the roads during snow events when the temperature is below -15 degrees Celsius? *
A. Salts are nonelectrolytes and do not demonstrate the Van't Hoff Factor.
Therefore the freezing point cannot be depressed lower than -15 C.
B.The solubility of a salt will decrease with decreasing temperature making it even more difficult to concentrate a solution. The maximum quantity that can saturate a solution and attain the maximum molality that aligns with solubility values at that low of a temperature cannot provide the multiplier high enough to depress the freezing point to temperatures below -15 C.
C.Salt has a maximum molality of 0.6m.
D.Salts can melt ice but cannot prevent freezing.
Answer:
i think thats c
Explanation:
In the equation:
X →
226
88
Ra + He
The symbol Xrepresents
A)
222
Th
86
222
B)
Rn
86
230 Th
C)
90
D)
230
90
Rn
Answer:
²³⁰₉₀Th
Explanation:
X → ²²⁶₈₈Ra + ⁴₂He
The given equation shows the alpha emission. When He particle emit the original atom convert into the atom having mass number less than 4 and atomic number less than 2 as compared to parent atom the starting atom. It means the parent atom is ²³⁰₉₀Th.
Alpha radiations are emitted as a result of radioactive decay. The atom emit the alpha particles consist of two proton and two neutrons. Which is also called helium nuclei. When atom undergoes the alpha emission the original atom convert into the atom having mass number less than 4 and atomic number less than 2 as compared to parent atom the starting atom.
Alpha radiations can travel in a short distance.
These radiations can not penetrate into the skin or clothes.
These radiations can be harmful for the human if these are inhaled.
These radiations can be stopped by a piece of paper.
₉₂U²³⁸ → ₉₀Th²³⁴ + ₂He⁴ + energy
If 2.35 L hydrogen gas react with nitrogen gas to form nitrogen trihydride, how many grams of nitrogen will be needed for the reaction to be completed?
0.98 g
0.49 g
21.93 g
1.47 g
Answer:
1.47 g
Explanation:
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Answer:
the answer to the first one is B and the second one is that the volume is a control, the heart rates are dependent, the how music played is controlled, how the heart rates are measured is controlled, the music played is independent
) The volume of a balloon was 50,200 litres. If the temperature
at ground level was 25 degree celcius and the atmospheric pressure was
720mm Hg. How many moles of Hydrogen gas were needed to
fill the balloon?
Answer:
1943.1 moles
Explanation:
From the question given above, the following data were obtained:
Volume (V) = 50200 L
Temperature (T) = 25 °C
Pressure (P) = 720 mmHg
Number of mole (n) of H₂ =?
Next, we shall convert 25 °C to Kelvin temperature. This can be obtained as follow:
T(K) = T(°C) + 273
Temperature (T) = 25 °C
Temperature (T) = 25 °C + 273
Temperature (T) = 298 K
Next, we shall convert 720 mmHg to atm. This can be obtained as follow:
760 mmHg = 1 atm
Therefore,
720 mmHg = 720 mmHg × 1 atm / 760 mmHg
720 mmHg = 0.947 atm
Thus, 720 mmHg is equivalent to 0.947 atm
Finally, we shall determine number of mole of Hydrogen gas, H₂, needed to fill the balloon as follow:
Volume (V) = 50200 L
Temperature (T) = 298 K
Pressure (P) = 0.947 atm
Gas constant (R) = 0.0821 atm.L/Kmol
Number of mole (n) of H₂ =?
PV = nRT
0.947 × 50200 = n × 0.0821 × 298
47539.4 = n × 24.4658
Divide both side by 24.4658
n = 47539.4 / 24.4658
n = 1943.1 moles
2210.20 J of energy is equal to how many calories?
Answer:
528.25 Calories
Explanation:
From the question given above, the following data were obtained:
Energy in Joules = 2210.20 J
Energy in calories =?
We can convert 2210.20 J to calories by doing the following:
4.184 J = 1 cal
Therefore,
2210.20 J = 2210.20 J × 1 cal / 4.184 J
2210.20 J = 528.25 Calories
Thus, 2210.20 J is equivalent to 528.25 Calories.
Is Na2SO4 ionic or covalent
Answer: What types of bonds exist between the atoms in a molecule of sodium sulfate, Na2SO4 ? The formula for this compound can be written as [Na+]2[SO42-], the sulfate anion is formed by covalent bonding between sulfur and oxygen. Since there is a bond polarity to a S-O bond these are polar covalent bonds.
Explanation:
The sulphate anion is created via covalent interaction between oxygen and sulphur, and the formula to this chemical is [[tex]Na^+[/tex]][[tex]SO_4^{2-}[/tex]]. These S-O bonds constitute polar covalent bonds because they have a bond polarity.
A polar bond represents a particular type of covalent bond in general. It is also the point at which an ionic bond and an unadulterated covalent bond begin to form, according to another definition. A polar covalent bond, on the other hand, is a link that occurs between two atoms and is made up of electrons which are scattered unevenly if we would like to explain it more precisely. The molecules have a tendency to have an electrical dipole moment in which the two ends are slightly either positive or negative as a result of this condition. The sulphate anion is created via covalent interaction between oxygen and sulphur, and the formula to this chemical is [[tex]Na^+[/tex]][[tex]SO_4^{2-}[/tex]]. These S-O bonds constitute polar covalent bonds because they have a bond polarity.
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HELP PLEASE! Which of these is an example of the climate of a region?
Continental
Foggy
Overcast
Sunny
Answer:
Continential
Explanation:
foggy, overcast, and sunny are all examples of weather
I promise it's easy points
Describe the life cycle of a star what determines the path a star could take.
PLEASE HELP
What do you know about valence electrons?
Answer:
Valence electrons are the electrons in the outermost shell, or energy level, of an atom
Explanation:
Answer:
Valence electrons are the electrons in the outermost shell, or energy level, of an atom. For example, oxygen has six valence electrons, two in the 2s subshell and four in the 2p subshell. We can write the configuration of oxygen's valence electrons as 2s²2p⁴
A blueberry bush uses energy from the sun to make sugars. which set of enerdy transformations BEST describe this process?
What is the first step for response to an emergency situation?
Answer:
Back away from the situation and tell the supervisor/teacher
Which of the following describes a perpetual-motion machine?
A. A battery that contains one oxidized metal and one reduced metal
B. A renewable energy source
C. A motor that requires no energy input once it is running
D. An electric motor that is powered by an electromagnet
SUBMIT
Answer:
a motor that requires no energy input once it is running
Answer:
c
Explanation:
a p e x :)
The density of whole milk 1.04 g per mL. What is the volume (in quarts) of 18.5 pounds of whole milk?
The volume : 8,526 quarts
Further explanationGiven
The density of whole milk = 1.04 g/ml
mass = 18.5 pounds
Required
The volume
Solution
Conversion of mass
1 pound = 453,592 g
18.5 pounds = 8391,45 g
Density formula:
[tex]\large{\boxed {\bold {\rho~=~ \frac {m} {V}}}}[/tex].
Input the value :
V = m : ρ
V = 8391,45 g : 1.04 g/ml
V = 8068.7 ml
1 ml = 0,00105669 quarts
8068.7 ml =8,526 quarts
What fraction of a 100 g sample of K - 42 will remain after 24.8 hours?
Answer:
1/4
Explanation:
From the question given above, the following data were:
Original amount (N₀) = 100 g
Time (t) = 24.8 h
Fraction remaining =?
NOTE: The half-life of K–42 is 12.4 h
Next, we shall determine the number of half-lives that has elapse. This can be obtained as follow:
Time (t) = 24.8 h
Half-life (t½) = 12.4 h
Number of half-lives (n) =?
n = t / t½
n = 24.8 / 12.4
n = 2
Finally, we shall determine the fraction remaining. This can be obtained as follow:
Number of half-lives (n) = 2
Fraction remaining =?
Fraction remaining = 1/2ⁿ
Fraction remaining = 1/2²
Fraction remaining = 1/4
How many moles are in 17.0 grams of H2O2?
Answer: 0.500
Explanation:17.0 g H202 x (1 mol H202/34.0 g H202)=0.500 mol H202
Answer: 0.5 moles are present in 17.0 g of [tex]H_{2}O_{2}[/tex] .
Explanation:
Number of moles present in a substance is the given mass divided by molar mass of the substance.
As the given mass of [tex]H_{2}O_{2}[/tex] is 17.0 g and its molar mass is 34 g/mol.
Hence, number of moles present in given 17.0 g of [tex]H_{2}O_{2}[/tex] is as follows.
No. of moles = [tex]\frac{mass}{molar mass}[/tex]
= [tex]\frac{17.0 g}{34 g/mol}[/tex]
= 0.5 moles
Therefore, 0.5 moles are present in 17.0 g of [tex]H_{2}O_{2}[/tex] .
Definition in your own words
Will check if you got it from online.
Word: States (Phases) of Matter
Answer:
Liquid,gas,solid and plasma
Explanation:
There four phases of matter. These phases are the gas phase(steam), the liquid phase(water), the solid phase(Ice) and finally the plasma phase(moucous).
A line in the Balmer series of the emission spectrum of atomic hydrogen is observed at a wavelength of 486.3 nm. Deduce the upper state principal quantum number for this transition.
Answer:
4
Explanation:
The Balmer series refers to to a series of spectral emission lines of the hydrogen atom that occurs when an electron moves from higher energy levels to the energy level of n= 2.
Hence;
λ = 486.3 * 10^-9 m
RH = 1.097 * 10^7 m-1
nf = 2
ni = ?
Using the formula;
1/λ = RH (1/nf^2 - 1/ni^2)
1/486.3 * 10^-9 = 1.097 * 10^7 (1/4 - 1/ni^2)
2.06 * 10^6/1.097 * 10^7 = (1/4 - 1/ni^2)
0.188 = 1/4 - 1/ni^2
1/ni^2 = 1/4 - 0.188
1/ni^2 = 0.25 - 0.188
1/ni^2 = 0.062
ni^2 = 16
ni = 4
A solid reactant is placed into a beaker of a warm water. The liquid vigorously bubbles as the solid dissolves into the solution. What will most likely happen if the temperature of the liquid is slightly reduced?
Answer:
Fewer bubbles will be produced because of fewer collisions of reactant molecules
Explanation:
As the solid dissolves into the solution after the liquid has been vigorously bubbled, if the temperature of the liquid is reduced a little, what will happen is that fewer bubbles will be produced as a result of lesser amount of collisions occurring between the reactant molecules
Answer:
b
Explanation:
Which planet has these characteristics?
- cold at the surface, hot at the core
- 30 moons orbiting it
- the largest rings
- a surface that is not solid
Pluto
Jupiter
Neptune
Saturn
what is the meaning of science
Answer:
Here goes
Explanation:
the intellectual and practical activity encompassing the systematic study of the structure and behaviour of the physical and natural world through observation and experiment.
What's the equation for the reaction of Trifluoro bromide with Ammonia gas. ( brainliest assured )
Answer:
Ammonium bromide can be prepared by the direct action of hydrogen bromide on ammonia. It can also be prepared by the reaction of ammonia with iron(II) bromide or iron(III) bromide, which may be obtained by passing aqueous bromine solution over iron filings.
Explanation:
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in an electron dot diagram of fluorine , how many dots should be drawn around the elements symbol
Answer:
7 dots
Explanation:
The Goodyear blimp contains 5.7 x 10^6 L of helium at 25 degrees Celsius and 1 atm. What is the mass in grams of the helium inside the blimp
Answer:
1.72x10⁻⁵ g
Explanation:
To solve this problem we use the PV=nRT equation, where:
P = 1 atmV = 5.7x10⁶ Ln = ?R = 0.082 atm·L·mol⁻¹·K⁻¹T = 25 °C ⇒ (25+273.16) = 298.16 KAnd we solve for n:
1 atm * 5.7x10⁶ L = n * 0.082 atm·L·mol⁻¹·K⁻¹ * 298.16 K n = 4.29x10⁻⁶ molFinally we convert moles of helium to grams, using its molar mass:
4.29x10⁻⁶ mol * 4 g/mol = 1.72x10⁻⁵ gWhat are the three states in which water exists on Earth?
In the nucleus, a sodium atom (Na) has 11p+ and 12 nºo. How would you write the
sodium ion based on the loss of one electron?
Answer:
Na⁺
Explanation:
Given parameters:
Number of protons = 11
Number of neutrons = 12
Writing the expression based on sodium ion that lost one electron;
In a neutral sodium atom, the number of protons and electrons are the same. Number of protons are the the positively charged particles in an atom.
Number of electrons are the negatively charged particles.
If an atom loses electron for instance sodium:
Number of electrons = 10
Number of protons = 11
Charge on the atom = 11 - 10 = 1+
So, the symbol of the atom is Na⁺