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
NeTakaya
3 years ago
7

How much energy is required to change the temperature of 35.0 g of Lead

Chemistry
1 answer:
Nezavi [6.7K]3 years ago
7 0

Answer:

Q = 270 Joules (2 sig. figs. as based on temperature change.)

Explanation:

Heat Transfer Equation of pure condensed phase substance => Q = mcΔT

Mixed phase (s ⇄ l melting/freezing, or l ⇄ g boiling/condensation) heat transfer equation => Q = m∙ΔHₓ; ΔHₓ = phase transition constant

Since this is a pure condensed phase (or, single phase) form of lead (Pb°(s)) and not melting/freezing or boiling/condensation, one should use

Q = m·c·ΔT

m = mass of lead = 35.0g

c = specific heat of lead = 0.16J/g°C

ΔT = Temp change = 74°C - 25°C = 49°C

Q = (35.0g)(0.16J/g·°C )(49°C) = 274.4 Joules ≅ 270 Joules (2 sig. figs. as based on temperature change.)

You might be interested in
The molecules of a substance must have what characteristics in order to be flexible
Goryan [66]
Answer:
            <span>The molecules of a substance which must have the <u>a</u></span><u>bility to move past one another</u> are said to be flexible.

Explanation:
                   Those substances are said to be flexible which can be bent without breaking. There are many substances which are hard in nature but still can be bent. The hardness of such materials is due to strong interactions between the molecules and the flexibility comes due to their amorphous backbone. Therefore, greater the crystalline level of macromolecules lesser is the flexibility and greater the amorphous character greater is the flexibility and vice versa. Also, the flexibility of polymers is increased by adding plastisizers in it. Plastisizers make the hard polymers flexible by breaking the crosslinkers and enabling the macromolecules to move past one another.

6 0
3 years ago
Which is the smallest?<br> A) 1.3 x 1020<br> B) 2.9 x 1021<br> C) 9.5 x 1032<br> d) 8.4 x 1019
alexgriva [62]
Answer: A, 1.3*1020, 1326

A. 1326

B. 2960.9

C. 9804

D. 8559.6
7 0
3 years ago
Read 2 more answers
Identify the folded membranes that move materials around the cell
yanalaym [24]
The ER takes up a lot of space in some cells<span>. The endoplasmic reticulum may be “rough” or “smooth.” ER that has no attached ribosomes is called smooth endoplasmic reticulum. </span>
7 0
2 years ago
Determine whether each melting point observation corresponds to a pure sample of a single compound or to an impure sample with m
ZanzabumX [31]

Answer:

Wide melting point range - impure sample with multiple compounds

Experimental melting point is close to literature value - pure sample of a single compound

Experimental melting point is below literature value - impure sample with multiple compounds

Narrow melting point range - pure sample of a single compound

Explanation:

The melting point of substances are easily obtainable from literature such as the CRC Handbook of Physics and Chemistry.

A single pure substance is always observed to melt within a narrow temperature range. This melting temperature is always very close to the melting point recorded in literature for the pure compound.

However, an impure sample with multiple compounds will melt over a wide temperature range. We also have to recall that impurities lower the melting point of a pure substance. Hence, the experimental melting point of an impure sample with multiple compounds is always below the literature value.

6 0
3 years ago
How would a long period without sunlight affect the food web?
zhuklara [117]

Answer: it would stop producers from producing food.

Explanation: why? Without the action of the producers to turn sunlight into food, the producers would die, and consumers that rely on them would lose their food source and die too.

7 0
2 years ago
Read 2 more answers
Other questions:
  • DNA samples should not be stored where?
    10·2 answers
  • Are chromosomes in side the nucleus of a plant cell
    8·1 answer
  • What gases occur in the same percentages throughout the layers of the atmosphere?
    9·1 answer
  • 4. What is an oscillatory motion? Give examples.​
    7·1 answer
  • What volume would be occupied by 7.75 g of a substance with a density of 1.71 g/cm3?
    10·1 answer
  • Classify an element having the following ground state electron configuration as an alkali metal, alkaline earth metal, nonmetal,
    14·1 answer
  • If it's a summer day and you want to take a picnic are you concerned with weather
    8·1 answer
  • PLEASE ASNWR ASAP
    6·1 answer
  • In an isolated system, mass can neither be<br> created or destroyed.<br> ube<br> FALSE<br> TRUE
    10·1 answer
  • What is the molar mass of CHCl3?<br> 48.47 g/mol<br> 83.92 g/mol<br> 119.37 g/mol<br> 121.39 g/mol
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!