- Some questions frequently asked by houseowners : omgg i have a test tomorrow, and i don't understand this?
♥ please someone, anyone help me with this! - atoms - ions - isotopes - molecules - atomic # - mass # - protons, electrons, and neutrons how do you get the atomic number using the protons, electrons, and neutrons? same with the mass number .. how do you get it? my science teacher sucks and won't explain this in a simpler way. please someone explain this to me .. in a understandable way .. please?!chemistry help please!!!?
♥ i have several questions.please answer what you can.this will decide if i pass or fail chemistry!thanks so much!!!!! #1which best describes this reaction: zn +cuso4 +znso4 a.combination b.decomposition c.single replacement d.combustion #2 which equation is balanced? a.h2so4+2naoh arrow na2so4+h2o b.ch4+cl2 arrow ch2cl2 +hcl c.h2o+mgo arrow mg(oh)2 d.al(oh)3+h3po4 arrow alpo4+2h2o #3 which shows simple chenical decomposition? a.h2+i2 arrow 2hi b.2nacl arrow 2na+cl2 c.naf+hci arrow hf+nacl d.i2+2nal+cl2 #4 if you nearly 10 x the density you should have what did you probably do wrong? a.mass and volume were multiplied b.mass of cylinder was included c.mass and volume were inverted #5 cu(s)+2agno3(aq) arrow cu(no3)2(aq)+2ag(s) number of grams of copper to produce 432 g of silver a.31.5 b.127 c.216 d.252 #6 what is the coefficient of the aici3? _aici3(aq)+__ba(oh)2(aq) arrow _al(oh)3(s)+_bacl2(aq) a.1 b.2 c.4 j.6 #7 which particle will complete this reaction? 59/27 co+_ arrow 60/27 co a.electron b.neutron c.nucleus d.proton #8 between element x and oxygen 2xo what would x likely be? a.fe b.zn c.ag d.sn #9 half life of phosphorus-32 is 14.30 days.how many mg of a 20.00 mg sample will remain after 85.80 days? a.3.333 b.0.6250 c.0.3125 d..1563 #10 how many mole in 59.6 g of baso4? a.0.256 b.3.91 c.13.9 d.59.6 #11 if sample of magnesium has a mass of 60g'how many moles of magnesium? a.1.1 b.1.2 c.2.0 d.2.5 #12 percent of mass of iron in feo? a.70% b.56% c.48% d.30% #13 empirical formula of ch2o and mass of 180 g compound's molecular formula? a.c3h6o3 b.c6h12o6 c.c6h11o7 d.c12h22o11 #14 most likely to bond to form a covalently bonded compound a.sodium and fluorine b.barium and chlorine c.phosphorus and oxygen d.magnesium and sulphur #15 which type of reaction? nh3(g)+hcl(g) arrow nh4cl(s) a.combustion b.decomposition c.single replacement d.synthesis #16 what coefficients are required to balance this: _fe2o3+_co arrow _fe+_co2 a.2,6,3,6 b.1,3,2,3 c.1,1,2,2 d.1,1,2,1 thanks a billion!!!!!!!!!!!!!!!!!!!!!!!!!!!.