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
Svet_ta [14]
3 years ago
15

3. What is the main difference between a physical change and a chemical

Physics
1 answer:
Lana71 [14]3 years ago
3 0

Answer:

B and D could both be right as they are quit similar.

Consider two rods of the same length and diameter,

Increasing the diameter of one would change the expansion qualities of that rod even though there would be no chemical changes,

However, leaving the physical appearance of both rods the same while applying a reactive substance (acid or something) to one of the rods would not necessarily change the physical appearance of that rod but could make a considerable change in the  physical properties of that rod.

You might be interested in
A 4.0 kg mass is attached to a spring whose spring constant is 950 N/m. It oscillates with an amplitude of 0.12 m. What is the m
Fudgin [204]

Answer:

velocity = 2.62m/s

Explanation:

950= (4 x A)/0.12

950 x 0.12 = 4 x A

114 = 4 x A

A = 114/4

A = 28.5m/s²

  • U²=2as
  • U² = 2 x 28.5 x 0.12
  • U² = 6.84
  • U = √6.84
  • U = 2.62m/s
3 0
3 years ago
If the gas inside the flask in the above exercise is cooled so that its pressure is reduced to a value of 715.7 torr, what will
evablogger [386]

Answer:

(a) 49.0 mm

Explanation:

#First we need to calculate the height of the mercury arm:

Reduced pressure is 715.7torr, Initial Pressure is 797.3torr, Required pressure is:

P_g_a_s=P_a_t_m+P_h\\  

The difference in the two arms will give the pressure difference between the gas placed in the flask attached to an open-end mercury manometer.

P_g_a_s=P_a_t_m+P_h\\797.3=P_a_t_m+(136.4mm-103.8mm)\\P_a_t_m=764.7mm\\\\h_t_o_t_a_l=136.4mm+103.8mm=240.2mm\\\\P_g_a_s=P_a_t_m+\bigtriangleup h\\\bigtriangleup h=P_g_a_s-P_a_t_m\\\\\bigtriangleup h=715.7mm-764.7mm\\=-49mm

Hence the height of the mercury in the arm is 49.00mm

4 0
3 years ago
Identify the force acting on the mass that causes the spring to extend
blsea [12.9K]

Jjjj. Uirhrhhruuegrur

4 0
3 years ago
For years, marine scientist were mystified by sound waves detected by underwater microphones in the Pacific Ocean. These so-call
pychu [463]

Answer:

225 m

Explanation:

f = Frequency of the T wave = 6.8 Hz

v = Speed of sound in seawater = 1530 ms⁻¹

\lambda = Wavelength of the T wave

we know that, frequency, speed and wavelength are related as

wavelength = \frac{speed}{frequency}

\lambda = \frac{v}{f}

Inserting the values, we get

\lambda = \frac{1530}{6.8}\\\lambda = 225 m

7 0
3 years ago
Which of the following is an engineering solution
Alona [7]
By "solution" it means a course of action that, once carried out, brings about some desired state of affairs. The use of engineer in this context is as a verb meaning "to arrange or bring about through skillful, artful contrivance."
5 0
3 years ago
Read 2 more answers
Other questions:
  • Why at the poles is the cenripetal accleration zero?
    14·1 answer
  • A scalloped hammerhead shark swims at a steady speed of 1.5 m/s with its 88 cm -cm-wide head perpendicular to the earth's 56 μT
    15·1 answer
  • If four vertical cables are holding up a rectangular, 100- Newton sign, how much tension is on each cable?
    15·2 answers
  • Model the concrete slab as being surrounded on both sides (contact area 24 m2) with a 2.1-m-thick layer of air in contact with a
    14·1 answer
  • A 10 kg block is attached to a light cord that is wrapped around the pulley of an electric motor, as shown above. At what rate i
    9·1 answer
  • Conversion fraction 1$=4q, how many are in 20$
    10·2 answers
  • Will give Brianliest answer. help.
    10·1 answer
  • O.
    7·1 answer
  • Can you answer this math homework? Please!
    12·1 answer
  • a 1 kg ball is confined to move on a. vertical circle of a radius 2 meters. There is no friciton between the bead and the circul
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!