True or False
a gas that ignites a glowing splint is oxygen
Answers
The statement is true , oxygen is a gas which ignites a glowing splint.
How does oxygen ignite a glowing splint?
A splint is a simple piece which is used in scientific laboratories. They are typically long, thin strips of wood of about 6 inches long and 1/4 inches wide. They are consumable and inexpensive. They are used for lighting burners , chemical identification of various gases .
For gases which are hard to distinguish , a glowing splint test is used for identification of gases. . These tests are useful for identifying whether the gas is oxidizing,flammable or chemically inert.Oxygen is one of the gases which can be identified using the splinter test as it is combustible.
For the test, the splint is lit and is allowed to burn for a fraction of seconds and then blown out as the tip is still hot it is introduced into the jar containing the oxygen gas and thus re-igniting the splinter.
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Related Questions
Is the following a chemical change or a physical change? A pencil is sharpened in a pencil sharpener, leaving behind shaving. Physical Change Chemical Change
Would you expect the water or sugar solution to have the most supercooling? WHY? PLEASE HELP
An element, X, has 2 isotopes, X-32 with an abundance of 31.5% and X-35 with an abundanceof 68.5%. What is the average atomic mass of element X?
Reflecting and refracting telescopes are used to gather radiation from space. Which of these statements best explains why a refracting telescope is made smaller than a reflecting telescope?A. Small lenses cause less distortion in images than big lenses. B. Small lenses cause more distortion in images than big lenses. C. Small telescopes gather more radiation from space than big telescopes. D. Small telescopes produce clearer images of distant objects than big telescopes. * PLEASE ONLY ANSWER THIS QUESTION IF YOU KNOW YOUR ANSWER IS 100% CORRECT * Thank you! :) -Also- I have heard there is "no right answer" to this question from others, but I still need to answer it, (preferably correctly!)
B. H3O+ ions as the only positive ions in solution
C. OH– ions as the only negative ions in solution
D. H– ions as the only negative ions in solution
Answers
Answer : The correct option is, (C) ions as the only negative ions in solution
Explanation :
According to the Arrhenius concept, an acid is a substance that ionizes in the water to give hydronium ion or hydrogen ion and a bases is a substance that ionizes in the water to give hydroxide ion
.
A sample of is considered to be an Arrhenius base because when it dissolves in the water to yield
ions as the only negative ions in solution.
Hence, the correct option is, (C)
Answers
The reaction is:
Cl2(aq) + 2Br-(aq) --> 2Cl-(aq) + Br2(aq)
The oxidizing agent is the one that is being reduced which is chlorine where the charge changed from neutral to -1 while the reducing agent is the one being oxidized which is bromine where the charge change from -1 to a neutral charge.
Answer:
The answer is C:
Chlorine (Cl) is the oxidizing agent because it gains an electron
higher temperature / less kinetic energy / less space between particles/ higher volume
higher temperature / more kinetic energy / less space between particles / lower volume
higher temperature / less kinetic energy / more space between particles / lower volume
Answers
Answer: higher temperature / more kinetic energy / more space between particles / higher volume.
Explanation:
1) One postulate of the kinetic theory is that the average kinetic energy of gas particles is proportional to the absolute temperature of the gas.
That means that the higher temperature, the higher the kinetic energy of the molecules, which is the start of the sequence of the relationship between temperature and volume.
2) Since average kinetic energy is proportional to the square of the speed, KE = [1/2] mass × (speed)², it follows that at higher the kinetic energy the faster the molecules will move.
3) By moving faster, the particles will collide more frequently so they will move away from each other, occupying more space.
4) More space between the molecules, is more volume.
So, the sequence is complete: higher temperature → higher kinetic energy (higher speed) → more space → more volume.
The answer is: higher temperature/ more kinetic energy/ more space between particles/ higher volume
Stored electrical energy is converted to mechanical energy.
Stored mechanical energy is converted to mechanical energy.
Stored nuclear energy is converted to electrical energy.
Answers
(2) C6H12O(s) and HCl(g)
(3) KI(s) and NaCl(s)
(4) NaCl(s) and HCl(g)
Answers
Answer is: (2) C6H12O(s) and HCl(g).
Covalent bond is bond between nonmetals.
Carbon, hydrogen, chlorine and oxygen are nonmetals.
Hydrogen chloride (HCl) has polar covalent bond between hydrogen and chlorine.
Potassium iodide (KI) and sodium chloride (NaCl) are ionic compounds.
Ionic bond is the electrostatic attraction between oppositely charged ions (cations and anions).
Among the four options, option (2) C6H12O(s) and HCl(g) represent covalent compounds as they consist only of nonmetals.
The question asks which of the given sets of substances are covalent compounds. Covalent compounds are formed when two nonmetals combine. By looking at the given options, option (2) C6H12O(s) and HCl(g) correspond to covalent compounds. C6H12O(s) is glucose, a sugar composed of carbon (C), hydrogen (H), and oxygen (O) - all nonmetals. Likewise, HCl(g) is hydrochloric acid, composed of hydrogen (H), a nonmetal, and Chlorine (Cl), another nonmetal. The other options include substances like KI and NaCl which are ionic compounds, not covalent, because they are formed from a metal and nonmetal.
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Answers
The right response is that, Using the 0.200 M KBr solution, about 43.31 mL should be mixed with water to create a 0.0495 M solution with a volume of 175.0 mL.
175.0 mL is the final volume needed for a 0.0495 M solution. To achieve this, we can use the dilution formula and calculate the amount of 0.200 M KBr solution necessary.
V2C2 is equivalent to V1C1, as depicted by the formula C1V1 = C2V2.
Where:
Starting at 0.200 M, C1 indicates the concentration of the solution.
Unknown is the designation for the volume of the first solution that will be used.
The diluted solution's final volume is V2, and its ultimate concentration is marked as C2 (0.0495 M).
To determine V1, rewrite the equation as V1 = (C2 * V2) / C1.
Based on these values:
V2 is 175.0 mL, C1 is 0.200 M, and C2 is 0.0495 M.
Enter the corresponding values to establish V1:
= (0.0495 * 175.0) / 0.200 V1 = 43.3125 mL
You would need around 43.31 mL of the 0.200 M KBr solution to make a 0.0495 M solution (rounded to two decimal places) when diluted to 175.0 mL with water.
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Final answer:
To prepare a 0.0495 M solution of KBr by dilution to 175.0 mL with water, you would need 2.744 mL of 0.200 M KBr solution.
Explanation:
When diluting a solution, the equation M1V1 = M2V2 holds true, where M1 is the initial concentration, V1 is the initial volume, M2 is the final concentration, and V2 is the final volume. In this case, the final concentration (M2) is 0.0495 M, and the final volume (V2) is 175.0 mL.
Rearranging the equation to solve for V1, the initial volume of the concentrated solution needed, we have:
V1 = (M2 * V2) / M1
Substituting the given values:
V1 = (0.0495 M * 175.0 mL) / 0.200 M
V1 ≈ 43.3125 mL
This means you need 43.3125 mL of the 0.200 M KBr solution to achieve a concentration of 0.0495 M. However, since you have the concentrated solution at 0.200 M, you can dilute it further. The volume you take from the concentrated solution (V1) and the volume of water you add (V_water) should sum up to the final volume of 175.0 mL:
V1 + V_water = 175.0 mL
Rearranging to find V_water:
V_water = 175.0 mL - V1
V_water ≈ 175.0 mL - 43.3125 mL
V_water ≈ 131.6875 mL
So, you would take 43.3125 mL of the 0.200 M KBr solution and dilute it with approximately 131.6875 mL of water to get a total volume of 175.0 mL, resulting in a final concentration of 0.0495 M.
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