Semester questions chemistry

Dec 15th, 2015
DreamIt
Category:
Chemistry
Price: $5 USD

Question description

11 when you balance a chemical equation, what are you doing?

applying Mendeleev's law

applying the law of conservation of energy

applying the law of conservation of matter

applying the periodic law

12 which of the following equations describes a single -replacement reaction

2N2O5(g)--> O2(g)+4NO2(g)

Cl2(g) +2Kl(s)--> 2KCl(s)+l2(g)

2Na(s)+Cl2(g)-->2NaCl(s)

H2(g)+Br2(g)-->2HBr(g)

13 which of the following represents a correctly balanced chemical equation

Na2CO3(s)-->Na2O(s)+2CO2(g)

2ZnS(s)+2HCl(ag)-->4ZnCl2(ag)+H2S(g)

4Al(s)+3O2(g)-->2Al2O3(s)

Zn(s)+2HCl(ag)-->2ZnCl2(ag)+H2(g)

14 hydrogen gas and nitrogengas can react to form ammonia according to the following equation

N2(g)+3H2(g)-->2NH3(g)

how many liters of nitrogen gas are required to produce 2 moles of NH3(g)? one mole of gas occupies 22.4 liters under standard condtions of temperature and pressure STP

11.2L

22.4L

44.8L

67.2L

15 methane CH4, ammonia NH3, and oxygen can react to form hydrogen cyanide HCN and water according to this equation

2CH4+2NH3+3O2-->2HCN+6H2O

about how many grams of methane are required to produce 1 mole of HCN?

48g

16g

24g

34g

16 Carbonic acid H2CO3 forms when carbon dioxide CO2 dissolves in water according to this equation

CO2+H2O-->H2CO3

How many moles of CO2 must dissolve in an excess of water to produce 3 moles of H2CO3?

3mol

1mol

2mol

4mol

17 which of the following is a mixture of a gas dissolved in a liquid?

liquid hydrogen

dry ice (solid carbon dioxide)

soda pop

liquid oxygen

18 in a smple of which of these elements would you expect to find a sea of electrons surrounding nuclei?

N

O

Au

Ar

19 which of the following reactions often combines one reactant with oxygen?

synthesis

single-displacement

double-displacement

combustion

20  which of the following is correctly desribes the subatomic particles in the isotope 44Ca?

25 protons 20 elecrtons 24 neutrons

20 protons 24 electrons 25 neutrons

20 protons 20 electrons 24 neutrons

20 protons 24 electrons 20 neutrons





Tutor Answer

(Top Tutor) Daniel C.
(997)
School: UIUC
PREMIUM TUTOR

Studypool has helped 1,244,100 students

5 Reviews


Summary
Quality
Communication
On Time
Value
ashleyisgod
Nov 23rd, 2016
" Top quality work from this guy! I'll be back! "
Molly_Moon
Nov 1st, 2016
" AMAZING as always! "
Hemapathy
Oct 9th, 2016
" all I can say is wow very fast work, great work thanks "
BlueOcean
Sep 26th, 2016
" Awesome! Exactly what I wanted. "
kevin12622
Sep 17th, 2016
" Goes above and beyond expectations ! "
Ask your homework questions. Receive quality answers!

Type your question here (or upload an image)

1825 tutors are online

Brown University





1271 Tutors

California Institute of Technology




2131 Tutors

Carnegie Mellon University




982 Tutors

Columbia University





1256 Tutors

Dartmouth University





2113 Tutors

Emory University





2279 Tutors

Harvard University





599 Tutors

Massachusetts Institute of Technology



2319 Tutors

New York University





1645 Tutors

Notre Dam University





1911 Tutors

Oklahoma University





2122 Tutors

Pennsylvania State University





932 Tutors

Princeton University





1211 Tutors

Stanford University





983 Tutors

University of California





1282 Tutors

Oxford University





123 Tutors

Yale University





2325 Tutors