CHEMISTRY HIGH SCHOOL

What are the 5 areas of chemistry

Answers

Answer 1
Answer: The 5 main branches of chemistry are physics, analytical, biochemistry, organic chemistry, and inorganic chemistry.

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Bromine, a liquid at room temperature, has a boiling point of 58°C and a melting point of –7.2°C. Bromine can be classified as acompound. impure substance. mixture. pure substance.
Rank standard molar entropy without a data table? Without referring to a data table, rank the following compounds by standard molar entropy (highest to lowest). I can do it with a data table but not sure how to proceed without. Thank you for your help. N2(g) H2(g) C2H4(g)
as electrons are passed through the system of electron carriers associated with photosystem ii, they lose energy. what happens to this energy?
A sample originally contained 1.28 g of a radioisotope. It now contains 1.12 g of its daughter isotope. How many half-lives have passed since the sample originally formed? 3 4 8 16

Excess reagent definition

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The reactant in a chemical reaction that limits the amount of product that can be formed. The reaction will stop when all of the limiting reactant is consumed

What ion must be present for a compound to be considered a base?

Answers

it is OH- (hydroxide ion)

Determine which elements or compounds are products in the follow reaction equation: calcium + chlorine → calcium chloride A. calcium, chlorine, and calcium chloride B. calcium C. calcium and chlorine D. calcium chloride Reset Selection

Answers

Answer: D. calcium chloride

Explanation:

In reaction equations, reactants are on the left side of the arrow and products are on the right side of the arrow. So, our reactants are the elements calcium and chlorine, and our product is the compound calcium chloride.

I hope this helps! :)

Final answer:

In the given chemical reaction equation, the product is calcium chloride as it is formed from the reaction of calcium and chlorine.

Explanation:

In a chemical reaction, substances that are formed as a result of the reaction are known as products. In the given chemical equation, calcium (Ca) reacts with chlorine (Cl2) to produce calcium chloride (CaCl2). Therefore, in this reaction equation, the product is calcium chloride. The reactants, substances that exist before the reaction, are calcium and chlorine. So, the correct answer to your question is D. calcium chloride.

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The mass of a proton is equal to the mass of?

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It is about equal to the mass of the neutron. So, most people just say that they have the same mass.

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The answer would be neutron. Well, they do not have the exact same mass, only a difference of about 0.98 or even less than that. So they are counted as equals. 

For the same mixture, under the same conditions described in problem 7, calculate keq for 2nh3 (g) n2 (g) + 3h2(g). how is the keq for a forward reaction related to the keq for a reverse reaction

Answers

Answer: The relation between the forward and reverse reaction is K_f=(1)/(K_r)

Explanation:

For the given chemical equation:

2NH_3(g)\rightleftharpoons N_2 (g)+3H_2(g)

The expression of equilibrium constant for above equation follows:

K_f=([N_2][H_2]^3)/([NH_3]^2)         .......(1)

The reverse equation follows:

N_2 (g)+3H_2(g)\rightleftharpoons 2NH_3(g)

The expression of equilibrium constant for above equation follows:

K_r=([NH_3]^2)/([N_2][H_2]^3)       .......(2)

Relation expression 1 and expression 2, we get:

K_f=(1)/(K_r)

Hence, the relation between the forward and reverse reaction is K_f=(1)/(K_r)

If you have a crush and they are available but you don't know weather to ask them or just leave it alone which one to do

Answers

Answer: If you have a crush on someone, it can be difficult to decide whether to express your feelings or not. There are no hard and fast rules, but here are some things to consider:

Assess your feelings: Before you decide to act on your crush, it’s important to take some time to reflect on your feelings. Ask yourself why you like this person and what you hope to gain from expressing your feelings. Be honest with yourself about your motivations and expectations.

Consider the risks: While expressing your feelings can be exciting, it can also be risky. You may face rejection or damage an existing friendship. Think about how you would feel if the other person doesn’t feel the same way.

Think about timing: Timing is important when it comes to expressing your feelings. You don’t want to catch the other person off guard or put them in an awkward position. Consider whether this is a good time for both of you.

Be respectful: If you do decide to express your feelings, make sure you do so in a respectful way. Be honest but also considerate of the other person’s feelings.

Be prepared for any outcome: No matter what happens, be prepared for any outcome. If the other person doesn’t feel the same way, try not to take it personally. Remember that there are plenty of other people out there who would be lucky to have you in their life.

I hope this helps! Let me know if there’s anything else I can do for you.

Answer: Ask them

Explanation:

If you miss your chance you might regret it.
Other Questions
Why is calcium harder than potassium?
What is the percent by mass of oxygen in carbon dioxide (CO2)?
25) Which of these pH numbers indicates the highest level of acidity?A) 5B) 8C) 10D) 1226) Which pH indicates a basic solution?A) 1B) 5C) 7D) 1227) Given the following solutions:Solution A: pH of 10Solution B: pH of 7Solution C: pH of 5Which list has the solutions placed in order of increasing H+ concentration?A) A, B, CB) B, A, CC) C, A, BD) C, B, A28) Which of the following pH values indicates the highest concentration of hydronium ions in a solution?A) pH = 1B) pH = 2C) pH = 3D) pH = 429) As HCl(g) is added to water, the pH of the water solutionA) decreasesB) increasesC) remains the same30) What is the pH of a 0.0001 M aqueous solution of HCl?A) 1B) 2C) 3D) 431) What is the pH of a 0.001 M HNO3 solution?A) 1B) 2C) 3D) 1132) The [H3O+] of a solution is 1 × 10–8. This solution has a pH ofA) 6, which is acidicB) 8, which is basicC) 6, which is basicD) 8, which is acidic33) The H3O+ ion concentration of a solution is 1 × 10–4 mole per liter. This solution isA) acidic and has a pH of 4B) acidic and has a pH of 10C) basic and has a pH of 4D) basic and has a pH of 1034) The pH of 0.001M HCl isA) 1B) 2C) 3D) 435) Phenolphthalein is pink in an aqueous solution having a pH ofA) 5B) 2C) 7D) 1236) What is the color of the indicator thymol blue in a solution that has a pH of 11?A) redB) blueC) pinkD) yellow37) Three samples of the same solution are tested, each with a different indicator. All three indicators, bromthymol blue, bromcresol green and thymol blue, appear blue if the pH of the solution isA) 4.7B) 6.0C) 7.8D) 9.938) Based on the results of testing colorless solutions with indicators, which solution is most acidic?A) a solution in which bromthymol blue is blueB) a solution in which bromcresol green is blueC) a solution in which phenolphthalein is pinkD) a solution in which methyl orange is red39) Which indicator would best distinguish between a solution with a pH of 3.5 and a solution with a pH of 5.5A) bromthymol blueB) bromcresol greenC) litmusD) thymol blue40) Which indicator is blue in a solution that has a pH of 5.6?A) bromcresol greenB) bromthymol blueC) methyl orangeD) thymol blue41) Which indicator, when added to a solution, changes color from yellow to blue as the pH of the solution is changed from 5.5 to 8.0?A) bromcresol greenB) bromthymol blueC) litmusD) methyl orange42) The table below shows the color of the indicators methyl orange and litmus in two samples of the same solution.Which pH value is consistent with the indicator results?A) 1B) 5C) 3D) 1043) In which 0.01 M solution is phenolphthalein pink?A) CH3OH(aq)B) Ca(OH)2(aq)C) CH3COOH(aq)D) HNO3(aq)44) Which indicator is yellow in a solution with a pH of 9.8?A) methyl orangeB) bromthymol blueC) bromcresol greenD) thymol blue45) In which solution will thymol blue indicator appear blue?A) 0.1 M CH3COOHB) 0.1 M KOHC) 0.1 M HClD) 0.1 M H2SO446) According to Reference Table M, what is the color of the indicator methyl orange in a solution that has a pH of 2?A) blueB) yellowC) orangeD) red47) Which solution when mixed with a drop of bromthymol blue will cause the indicator to change from blue to yellow?A) 0.1 M HClB) 0.1 M NH3C) 0.1 M CH3OHD) 0.1 M NaOH48) According to one acid-base theory, NH3 acts as a base when an NH3 moleculeA) accepts an ionB) donates an ionC) accepts an ionD) donates an ion49) Given the diagram representing a reaction:According to one acid-base theory, the water acts asA) a base because it accepts an H+B) a base because it donates an H+C) an acid because it accepts an H+D) an acid because it donates an H+50) Given the balanced equation representing a reaction:According to one acid-base theory, the H2O() molecules act asA) a base because they accept H+ ionsB) a base because they donate H+ ionsC) an acid because they accept H+ ionsD) an acid because they donate H+ ions
Fill the 25-ml graduated cylinder with 11.5 mLof water, what’s the volume?