Chemical reactions Definition and 77 Threads

I was wondering how come when ever there's a question like aluminum reacts with bromine it is usually written like Al + Br2? or Potassium reacts with oxygen is K + O2? How do we know when there's 2 of them?? Is there like a special rule? Why isn't there K2 or Al2??

Homework Statement When copper metal is placed in a beaker containing a solution of silver nitrate, a reaction occurs which can be represented by the following equation: 2AgNO3(aq) + Cu(s) -----> Cu(NO3)2(aq) + 2Ag(s) a) Give the net ionic equation to represent this reaction occurring...

like mixing household chemicals together to get a cool reaction to help my brother for the science fair? please don't say baking soda and vinegar half the school is doing that for a volcano.

Why do some chemical reactions release energy, while other chemical reactions absorb energy?

Homework Statement Styrene is a Hydrocarbon. If 0.438g of Styrene is burned in Oxygen and produces 1.481g of CO2 and 0.303g of H20, what is the empirical formula of styrene? Homework Equations The Attempt at a Solution No. of moles of CO2 - 1.481g / 44.0107g/mol = 0.0337mol No...

chemical reactions with hydrochloric acid does p-toluidine hydrochloride dissolve in HCl?? When it combines with HCl, what would it produce?

Does mass of compounds change due to exothermic/endothermic chemical reactions?

I realize that to calculate heat being released and contained during nuclear reaction you must understand the difference between its product mass and reactant mass by using *E=mc2.* My Question pertains to the heat being released during a chemical reaction... Is Mass conserved in this chemical...

Aspirin, C9 H8 O4 (molar mass 180.2g/mol), a drug used to relieve minor aches and pains, is prepared by the following reaction: C7 H6 O3 (s) + C4 H6 O3 (l) --> C9 H8 O4 (s) + C2 H4 O2 (l) If you need to prepare 45.0g of aspirin, and yield for the reaction is 85% how many grams of salicylic...

hi i have the following reaction isobutyric acid + 2-methoxyethanol <-> 2-methoxyethyl-2-methylpropanoate but i don't know all of the by-products. please help thanks edit: i think is only water and some unreacted reactants?

i can't do this home work. i REALLY suck at physics, this is why I am here. can someone help me pleasse? :) 1#to combust completely 7g of iron, 2L of oxygen is needed. for each of the following state if any unreacred iron rests after combustion and if it does how much: a) 2g of iron and...

A simple question really. Does acceleration affect the rate of a chemicall reaction. I.e if I was to put some test (chemical) experiment aboard a suitable craft and accelerate it to a high velocity, would the reaction occur at the same rate as it would at rest - ignoring relativistic effects...

please check my work... urgent pleasezz 1> ZnCl2 [aq] + 2KNO3 [aq] → Zn(NO3)2[aq] + 2KCl (s) 2> Ca[OH]2 [aq] + 2Na OAc [aq] →Ca(OAc)2[aq] + 2NaOH (s) 3> NiCl2 + 2KOH → Ni(OH)2 [aq]+ 2KCl (s)

I can not seem to understand what happens when you react ammonium with certain compounds. For example NH3 + Cu(NO3)2 = ?. How am I supposed to do this?

Homework Statement I basically have 4 sets of solutions which I have to write the chemical reactions for. I already figured out the chemical formulas for the reactants, and just need help determining the final products. I know how to balance, and just need help determining the products...

hello, i hope someone can help me. i have a few questions. The elements sulfur and chlorine react to give disulfur dichloride according to the equation: S8 + 4Cl2 --> 4S2Cl2. There are 0.5987 mol S8. a) How many moles of Cl2 are needed for complete reaction? b) What mass of S2Cl2 in...

Hello, I am a A level student. I find difficulties with different chemical reactions. Is there any simple way of predicting chemical reactions. Is there any basic principles that can be followed instead of memorising chemical equations? Different chemical reactions occurs in different...

Metal AX BX CX DX EX A - + + + + B + - + - - C + + - + - D...

Energy is neither created nor destroyed in a chemical reactions. Explain where the energy released by the reactions comes from.

Help me understand please 0.6 mole of O2, 0.8 mole of CO and 0.5 mole of CO2 are added to a 2-L container. The system is heated and 0.15 mole of CO2 is formed. Does that mean that on top of the initial 0.5 mole of CO2 an additional 0.15 mole of CO2 is formed or does that mean that in total...

Working a problem in Greenburgs "Advanced Eng. Mathematics", #8 page 170. Two substances w/ concentration x(t) and y(t), react to form a 3rd substance w/ concentration z(t). The reaction is governed by the system x’+ αx = 0 z’= βy x + y + z = γ solve for x(t), y(t), and Z(t) subject to...

Hi, i woud like to ask one thing... Discuss the idea that the standard of living in a society might be measured in units of kJ/person available in that society. ...just instruct me how to do this question i mean what answer they are looking for...

Hello, I just need some help on these questions and some explaining. I need help writing the condensed word equation for these chemical equations: A) Li + Hg(ClO)_2 \xrightarrow~Hg + LiClO Maybe: Lithium + Mercury(II) Chlorine oxide ------> Lithium Carbonate B) C_8H_1_8 + O_2...

Hello, I just need some help on these questions and some explaining. What to do: > Balance each of the following chemical equations. > Identify the type of chemical reaction (Decompostion, Combustion and Synthesis) > Write the condensed word equation A) Li + Hg(ClO)_2 \xrightarrow~Hg...

general "quantities in chemical reactions" questions hi, im in high school, and we are currently doing a unit of chemistry on quantities in chemical reactions, and there are a few things i don't get, and i was wondering if anyone could show me a formula or an example, on calculating the...

Hi I got two questions regarding the following chemical: i) P_4 + 5O_2 -----> P_4 O_10 ii) P_4 O_10 + 6H_2O -----> 4H3 PO_4 How many grams of P_4 O_10 are formed in i) if there is 35 grams of P_4 ?? How many grams of H_3 PO_10 are formed in ii) if I have 35 grams of P_4 ...

A Rule of Thumb: "Higher Electronegativity seeks bonding with Lower Electronegativity" Before completing my PhD in organic chemistry, with a minor in inorganic, some 20 yrs ago, I realized that the main mechanism for most organic reactions and most inorganic reactions was one of negative...