1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
pshichka [43]
3 years ago
12

Need help with 14 and 16 pls asap!! this is my friends test and im taking it tomorrow!!

Chemistry
1 answer:
marin [14]3 years ago
6 0

Answer:

Q14: 17,140 g = 17.14 kg.

Q16: 504 J.

Explanation:

<u><em>Q14:</em></u>

  • To solve this problem, we can use the relation:

<em>Q = m.c.ΔT,</em>

where, Q is the amount of heat absorbed by ice (Q = 3600 x 10³ J).

m is the mass of the ice (m = ??? g).

c is the specific heat of the ice (c of ice = 2.1 J/g.°C).

ΔT is the difference between the initial and final temperature (ΔT = final T - initial T = 100.0°C - 0.0°C = 100.0°C).

∵ Q = m.c.ΔT

∴ (3600 x 10³ J) = m.(2.1 J/g.°C).(100.0°C)

∴ m = (3600 x 10³ J)/(2.1 J/g.°C).(100.0°C) = 17,140 g = 17.14 kg.

<u><em>Q16:</em></u>

  • To solve this problem, we can use the relation:

<em>Q = m.c.ΔT,</em>

where, Q is the amount of heat absorbed by ice (Q = ??? J).

m is the mass of the ice (m = 12.0 g).

c is the specific heat of the ice (c of ice = 2.1 J/g.°C).

ΔT is the difference between the initial and final temperature (ΔT = final T - initial T = 0.0°C - (-20.0°C) = 20.0°C).

∴ Q = m.c.ΔT = (12.0 g)(2.1 J/g.°C)(20.0°C) = 504 J.

You might be interested in
Who made the idea that as you go down the periodic table the atomic radius increases and the first ionization energy decreases?
bekas [8.4K]

<u>Answer:</u>

The idea that as we go down the periodic table the atomic radius increases and first ionization energy decreases was given by Henry Moosely after he made some changes in the periodic table, the theory proposed by Mendeleev.

<u>Explanation:</u>

  • Both these trends were well explained and supported by genuine reasons.
  • As we go down a group in periodic table, a new shell is added at each level, which increases the size and hence the radius of the atom and the size of atom increases which means the outermost shell is increasingly moving farther from the atom.
  • Due to this fact, electrons experience less attractive force from the nucleus and electrons are easily removed, so the first ionization energy decreases.
7 0
3 years ago
Read 2 more answers
According to the kinetic theory, gases consist of particles that have motion that is constant, random, and rapid.occupy consider
bearhunter [10]

Answer:

Have motion that is constant, random, and rapid.

Explanation:

A is correct. This is one of the postulates of the Kinetic Molecular Theory.

B is <em>wrong</em>. The molecules of an ideal gas have a negligible volume.

C is <em>wrong</em>. The molecules of an ideal gas exert no attractive or repulsive forces on each other.

D is <em>wrong</em>. The molecules of an ideal gas are far apart from each other.

3 0
3 years ago
What is percentage of nitrogen is in nf2?
solmaris [256]
Molar mass NF₂ => 52.00 g/mol

Atomic mass N => 14 a.m.u

% N =  ( Atomic mass N / molar mass NF₂ ) x 100

( 14 / 52 ) x 100 = 26.92%

hope this helps!




6 0
3 years ago
galvanic cell is powered by the following redox reaction: (g) (aq) (l)(aq) (s) (aq) Answer the following questions about this ce
kotykmax [81]

Answer:

Explanation:

1. the 1/2 reaction that occurs at the cathode

3Cl2(g) +6e^- -------------> 6Cl^- (aq)

2 the 1/2 reaction that occurs at the anode

2MnO2(s) + 8OH^-(aq) ----------> 2MnO4^- (aq) + 4H2O(l) +6e^-      

2MnO2(s) + 8OH^-(aq) ----------> 2MnO4^- (aq) + 4H2O(l) +6e^-

E0 = -0.59v

3Cl2(g) +6e^- -------------> 6Cl^- (aq)                                                  

E0 = 1.39v

3Cl2 (g) + 2MnO2 (s) + 8OH^(−) (aq)---------> 6Cl^(−) (aq) + 2MnO4^(−) (aq) + 4H2O (l)  

E0cell = 0.80v

5 0
3 years ago
Mohs hardness strontium
Taya2010 [7]

Answer: 5.5

Explanation: Strontium titanate is both much denser (specific gravity 4.88 for natural, 5.13 for synthetic) and much softer (Mohs hardness 5.5 for synthetic, 6–6.5 for natural) than diamond.

5 0
3 years ago
Other questions:
  • What is the [OH^+] ina solution that has a pH=4.02
    14·1 answer
  • Consider the chemical equation. 2H2 + O2 mc022-1.jpg 2H2O What is the percent yield of H2O if 87.0 g of H2O is produced by combi
    11·2 answers
  • Indium has only two naturally occurring isotopes. the mass of indium-113 is 112.9041 amu and the mass of indium-115 is 114.9039
    10·1 answer
  • HELP!! I NEED AN ANSWER!!
    15·1 answer
  • HELP IM GIVING BRAINLY
    9·1 answer
  • Imagine two solutions with the same concentration and the same boiling point, but one has benzene as the solvent and the other h
    7·1 answer
  • What kind of forces act between molecules?
    10·2 answers
  • strychnine a deadly poison, has a formula mass of 334 g mol- and a percent composition of 75.42% C, 6.63% H, 8.38% N and the bal
    5·1 answer
  • What is the number of moles of potassium chloride present in 142 g of kcl?
    6·1 answer
  • Describe the motion of a person NOT wearing a seat belt if the car stops suddenly
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!