Answers
see screenshot for chart data
62.5 grams of material will remain after the indicated time has passed.
What are isotopes?Any of two or more species of atoms of a chemical element with the same atomic number and nearly identical chemical behaviour but with different atomic mass or a mass number and different physical properties.
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Related Questions
How many grams are needed to make 2 L of solution of 4 M LiNO3?
Answers
Answer:
552 g of LiNO₃
Explanation:
From the question given above, the following data were obtained:
Volume of solution = 2 L
Molarity of LiNO₃ = 4 M
Mass of LiNO₃ =?
Next, we shall determine the number of mole of LiNO₃ in the solution. This can be obtained as follow:
Volume of solution = 2 L
Molarity of LiNO₃ = 4 M
Mole of LiNO₃ =?
Molarity = mole /Volume
4 = mole of LiNO₃ / 2
Cross multiply
Mole of LiNO₃ = 4 × 2
Mole of LiNO₃ = 8 moles
Finally, we shall determine the mass of of LiNO₃ needed to prepare the solution. This is can be obtained as follow:
Mole of LiNO₃ = 8 moles
Molar mass of LiNO₃ = 7 + 14 + (16×3)
= 7 + 14 + 48
= 69 g/mol
Mass of LiNO₃ =?
Mole = mass /Molar mass
8 = Molar mass of LiNO₃ /69
Cross multiply
Molar mass of LiNO₃ = 8 × 69
Molar mass of LiNO₃ = 552 g
Thus, 552 g of LiNO₃ is needed to prepare the solution.
Condensation is the process by which water vapor in the air is changed. Into liquid water. Water molecules in the vapor form are arranged and randomly than in water.As condensation occurs liquid water forms from the vapor, the water molecules become more organized and heat is..
A)absorbed
B) created
C) radiated
D)realeased
Please help!!!
Answers
Answer:
the answer is B.
Explanation:
The heat is created
A strong beam of light is directed toward a tank filled with water. What caused the beam of light to change direction?
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When light travels from less dense air to denser glass or water, it slows down. Slowing down of a ray of light changes the direction of the ray of light.
What is Ray of light?Light that travels in a straight line in one direction is called a ray of light. When a group of light emanates from a source, it is called a beam of light. A beam of light is defined as the path of a photon or a group of photons traveling through a space appearing as a column of light.
There are three types of light rays. They are
Incident raysReflected raysRefracted raysExample of a beam is a beam of light with a pass from a laser or laser pointer. A beam of light is made up of particles called photons that carry specific amounts of energy. We cannot measure the length of a beam.
Thus, when light travels from less dense air to denser glass or water, it slows down. Slowing down of a ray of light changes the direction of the ray of light.
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Most objects are not able to float in midair. What must be occurring for these rings to float instead of fall
Answers
Answer:
magnetic force
Explanation:
A magnet is defined as an object that can attract other objects that are made of iron. Magnets also repels or push away other magnets. Every piece of magnets have two poles namely, a south pole and a north pole. When one magnet comes near another magnet, it exerts a magnetic force on the other magnet. This force can be attractive force or repelling force depending upon the poles surface of the magnet that are close to each other.
Like pole repel each other while opposite poles attract each other.
In the context, the rings of magnet are floating in the air because there is a magnetic force that is repelling the like surfaces or the like poles of these magnetic rings.
21 POINTS TO WHO EVER CAN ANSWER THIS
Explain why water is considered the "universal solvent".
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Answer:
Explanation:
Water is capable of dissolving a variety of different substances, which is why it is such a good solvent. And, water is called the "universal solvent" because it dissolves more substances than any other liquid. This allows the water molecule to become attracted to many other different types of molecules.
5.
__________currents can form when liquids and gases are heated. The cold air________and the hot
air
6. Energy can travel through empty space by________Dull black surfaces are_________radiators and_______absorbers. Shiny surface are_________radiators and
absorbers of radiation.
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Answer:
Explanation:
Convection
Cold air sinks
Hot air rises
Radiation
faster
better
poor
I think
What is the final chemical equation from the following intermediate chemical equations?
2 equations. First: upper P subscript 4 upper O subscript 6 (s) right arrow upper P subscript 4 (s) plus 3 upper O subscript 2 (g). Second: upper P subscript 4 (s) plus 5 upper O subscript 2 (g) right arrow upper P subscript 4 upper O subscript 10 (s).
Upper P subscript 4 upper O subscript 6 (s) plus 2 upper O subscript 2 (g) right arrow upper P subscript 4 upper O subscript 10 (s).
Upper P subscript 4 upper O subscript 6 (s) plus 8 upper O subscript 2 (g) right arrow 2 upper P subscript 4 (s) plus upper P subscript 4 upper O subscript 10 (s).
Upper P subscript 4 upper O subscript 6 (s) plus 15 upper O subscript 2 (g) right arrow upper P subscript 4 (s) plus upper P subscript 4 upper O subscript 10 (s).
Upper P subscript 4 upper O subscript 6 (s) StartFraction 5 over 3 EndFraction upper O subscript 2 (g) right arrow upper P subscript 4 upper O subscript 10 (s).
pls hurry
Answers
Answer:
A
Explanation:
edge2021
Answer:
A.
Explanation:
Edge
Jenna notices that the speed of the wind has increased throughout the day. What is causing the faster wind?
A. There has been no precipitation.
B. The difference in air pressure has decreased.
C. The difference in air pressure has increased.
D. The direction of the wind has changed to the south.
Answers
Answer:
It is either C or D I think
Explanation:
I did the test a week ago but I can not figure out if it was C or D, but it was one of them...Hope it helps!
I think its C I'm not sure though.
perspex and polythene are two examples of what?
Answers
What is the pH of a 0.0075 molar solution of ammonia (NH3)? given:publish =4.75.
Answers
Answer:
10.57
Explanation:
Step 1: Given and required data
Concentration of NH₃ (Cb): 0.0075 MBasic dissociation constant for NH₃ (Kb): 1.8 × 10⁻⁵Step 2: Write the basic dissociation reaction for NH₃
NH₃(aq) + H₂O(aq) ⇄ NH₄⁺(aq) + OH⁻(aq)
Step 3: Calculate the concentration of OH⁻
We will use the following expression.
[OH⁻] = √(Kb × Cb)
[OH⁻] = √(1.8 × 10⁻⁵ × 0.0075 M) = 3.7 × 10⁻⁴ M
Step 4: Calculate the concentration of H⁺
We will use the water ion product.
Kw = 1.0 × 10⁻¹⁴ = [H⁺] × [OH⁻]
[H⁺] = 1.0 × 10⁻¹⁴/3.7 × 10⁻⁴ = 2.7 × 10⁻¹¹ M
Step 5: Calculate the pH of the solution
We will use the definition of pH.
pH = -log [H⁺] = -log 2.7 × 10⁻¹¹ = 10.57
Ionization refers to the process of
A. changing from one period to another.
B. losing or gaining protons
C. turning lithium into fluorine.
D. losing or gaining electrons.
Answers
Answer:
B
Explanation:
If a gas is cooled from 222 K to 125 K and the volume is kept constant, what would be the final
pressure if the original pressure was 760 mmHg?
Answers
We know the initial and final temperatures of the gas (T1 = 222 K; T2 = 125 K) and the initial pressure (760 mmHg). And we want to know what the final pressure would be. Since pressure and temperature are directly proportional and the final temperature is less than the initial temperature, we should expect the final pressure (P2) to be less than 760 mmHg.
Rearranging Gay-Lussac’s law to solve for P2, we obtain P2 = P1T2/T1. Plugging in our quantities, we get our final pressure: P2 = (760 mmHg)(125 K)/(222 K) = 428 mmHg.
which element was used by the ancient egyptians, in the form of borax, to make mummies?
Answers
Answer:
boron compound - known as Borax
Explanation:
between 7.35 and 7.45, Which of the following best describes human
blood
Answers
Answer:
human blood is slightly basic
Explanation:
If the pH of a solution is less than 7, it is acidic. If the pH is 7, the solution is neutral and if the pH is greater than 7,the solution is basic. So human blood is slightly basic.
What is the mass of 3.92 mol of calcium chloride ?
Answers
Answer: Do a quick conversion: 1 moles Calcium Chloride = 110.984 gram using the molecular weight calculator and the molar mass of CaCl2.
Explanation:
Answer:
three mole of CaCI2 have a mass of 3•molx110.98•g•mol-1=333•g
what are clean sources of energy
Answers
solar energy
wind energy
hydro energy
tidal energy
geothermal energy
What are the stages of the life cycle of the sun
Answers
Main sequence star - red giant - white dwarf
In Order
A solution contains 6 mg isopropanol dissolved in 2 kg H2O. The isopropanol concentration is?
a. 3% isopropanol.
b.3 M isopropanol.
c.3 m isopropanol.
d. 3 ppm isopropanol.
Answers
Answer:
B
Explanation:
Mass=concentration × volume
Therefore, concentration = mass/volume
C=6/2
C=3
ionization refers to the process of what
Answers
Answer:
Any process that leads to the dissociation of a neutral atom or molecule into charged particles ions; the state of being ionized.
Explanation:
Which formula represents a nonpolar molecule containing polar covalent bonds?
Answers
Answer:
Figure 2 represents a nonpolar molecule containing polar covalent bonds
Explanation:
The CO2 molecule is linear, formed by 3 atoms and the electronegativity variations are equal, so its dipolar moment will be null, and this molecule will be nonpolar, however, it has polar covalent bonds.
Help me anyone? Thanks!!!!
Answers
Use the Pythagorean theorem.
A^2 + b^2 = c^2
Plug in the legs for a and b(they can be switched) and the hypotenuse for c.
_ Na3PO4 + _ HCl NaCl + _ H3PO4
Answers
Answer:
Na₃PO₄ + 3HCl —> 3NaCl + H₃PO₄
The coefficients are: 1, 3, 3, 1
Explanation:
_Na₃PO₄ + __HCl —> __NaCl + _H₃PO₄
The above equation can be balance as follow:
Na₃PO₄ + HCl —> NaCl + H₃PO₄
There are 3 atoms of Na on the left side and 1 atom on the right side. It can be balance by writing 3 before NaCl as shown below:
Na₃PO₄ + HCl —> 3NaCl + H₃PO₄
There are 3 atoms of Cl on the right side and 1 atom on the left side. It can be balance by writing 3 before HCl as shown below:
Na₃PO₄ + 3HCl —> 3NaCl + H₃PO₄
Now, the equation is balanced.
The coefficients are: 1, 3, 3, 1
An arctic weather balloon is filled with 34.1L of helium gas inside a prep shed. The temperature inside the shed is 5.°C. The balloon is then taken outside, where the temperature is â5.°C. Calculate the new volume of the balloon. You may assume the pressure on the balloon stays constant at exactly 1atm. Be sure your answer has the correct number of significant digits.
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Answer:
When the balloon is taken outside if the outside temperature is lower than the temperature inside the shed, the volume of the helium gas will decrease according to Charles' law. However, if the temperatureoutside is higher than inside the shed, the volume of the helium gas in the weather balloons will increase.
Note: The question is not complete. Assumptionshas been made about the temperature.
Explanation:
According to Charles' law of gases, the volume of a given mass of gas is directly proportional to its temperature in Kelvin provided its pressure remains constant.
Mathematically, V1T1 = V2T2
Given that the volume of the helium gas inside the weather balloon is 34.1 L at a temperature of 5 °C;
When the balloon is taken outside if the outside temperature is lower than the temperature inside the shed, the volume of the helium gas will decrease according to Charles' law. However, if the temperatureoutside is higher than inside the shed, the volume of the helium gas in the weather balloons will increase.
Assuming, the temperature outside the shed was 6.5 °C:
V1 = 34.1 L, T1 = 5.°C or 5.0 × 10^-10 °C = 273.1500000005
V2 = ?, T2 = 6.5 °C 6.5 × 10^-10 °C = 273.15000000065
V2 = V1T1/T2
V2 = (34.1 × 273.1500000005) / 273.15000000065
V2 = 34.1 L
Due the very small increase in temperature, the volume of the balloon increases only very slightly that is increase that it is negligible.
Help pleaseeeeeee:)))))
Answers
Answer:
the answer is: 1'699.98 ok i hope i have helped maybe
= 25 X 5 = (use the correct number of sig figs)
Answers
Answer:
1.25 *10^2
Explanation:
25*5 = 125
= 1.25 *10^2
someone pls help rn!!
Answers
Answer:
280
Explanation:
total pressure=partial pressure (He)+partial pressure (N2)+partial pressure (H2)
One of the possible reactions for nuclear fusion involves the collision of 2 deuterium
nuclei. Complete the reaction by identifying the missing particle: 2/1H + 2/1H ——> 1/0n +?
Answers
Answer:
³₂He
Explanation:
From the question given above, the following equation was obtained
²₁H + ²₁H —> ¹₀n + __
Let ᵇₐX be the missing part of the equation. Thus, the equation becomes:
²₁H + ²₁H —> ¹₀n + ᵇₐX
Next, we shall determine b, a, and X. This can be obtained as follow:
2 + 2 = 1 + b
4 = 1 + b
Collect like terms
b = 4 – 1
b = 3
1 + 1 = 0 + a
2 = 0 + a
a = 2
ᵇₐX => ³₂X => ³₂He
Thus the equation is:
²₁H + ²₁H —> ¹₀n + ᵇₐX
²₁H + ²₁H —> ¹₀n + ³₂He
The missing part is ³₂He
what happens when water changes from a solid to a liquid to a vapor
Answers
Answer:
It forms a water cycle!
Hope it helps!!!
What volume of concentrated 15M H2SO4 is required to prepare 0.75 liters of a 6.0M solution?
Answers
Answer:
30 ml
Explanation:
Balance the 2 chemical equation below: 1) _____H2 + _____02 ---> _____H20 2) _____CH4 + _____Cl2 ---> _____CCl4 + _____HCl Your answer:
Answers
Answer:
1.) 2H2 + O2 ---> 2H2O
2.) CH4 + 4Cl2 ---> CCl4 + 4HCl
Explanation:
In order to balance the equation, you have to make sure there are the same amount of each element on both sides.
Ex (#1). By adding the coefficients infront of H2 and H20, You now have 4 hydrogen's and 2 oxygens on the left side as well as 4 hydrogens and 2 oxygens on the right side.
Sorry if that's confusing, but hope this helps! :)