Chemistry College

When a material gains thermal energy and melts, it is undergoing a physical change.

Answers

Answer 1

Answer:

True, it undergoes a physical change.

Explanation:

A physical change is a change that does not change the chemical makeup of a material. This includes altering its shape.

Related Questions

every spring has an equilibrium position which statement describe a spring at it equilibruim position?

Answers

The elastic potential energy is zero. The net force acting on the spring is zero. Explanation: The equilibrium position of a spring is the position that the spring has when its neither compressed nor stretched - it is also called natural length of the spring.Mar

A 12 gram piece of Cu at 475 oC is placed in contact with a 15 gram piece of Cr at 265 oC.

Assume the two pieces of metal are the system and that there is no heat exchange between system and surrounding.

What is the final temperature of the two pieces of metal expressed in degree C?

Answers

Answer:

349.22°C

Explanation:

Let the final temperature of the two pieces of metal be x.

Now, the warmer metal which is C u reduces from 475°C to x. Thus Δt for C u is; Δt1 = 475 - x.

The cooler metal Cr increases in temperature from 265°C to x. Thus, it's change in temperature is Δt for Cr is; Δt2 = x - 265.

Now from conservation of energy, the amount of energy leaving the C u metal is equal to the amount of energy entering the Cr metal.

Thus;

q_lost = q_gain

Where;

q_lost = m1•c1•Δt1

q_gained = m2•c2•Δt2

Now, c1 & c2 are the specific heat capacity of C u and Cr respectively.

From online tables, c1 = 0.385 J/g°C and c2 = 0.46 J/g°C

We are given;

m1 = 12g and m2 = 15g

Thus;

12 × 0.385 × (475 - x) = 15 × 0.46 × (x - 265)

2194.5 - 4.62x = 6.9x - 1828.5

6.9x + 4.62x = 2194.5 + 1828.5

11.52x = 4023

x = 4023/11.52

x = 349.22°C

Why does the flask have to be closed during the hydrochloric acid and sodium carbonate reaction?

Answers

Answer:

The flask has to be closed during the hydrochloric acid and sodium carbonate reaction as the resultant gas got trapped inside the closed flask.

Explanation:

The hydrochloric acid and sodium carbonate reaction was exothermic that caused the pressure to decrease. The flask has to be closed during the hydrochloric acid and sodium carbonate reaction as the resultant gas got trapped inside the closed flask.

In exothermic reactions, energy is produced in the form of heat or light.

A Barometer reads 29.1 inches of mercury.Calculate this pressure in mmHg.

What is the answer?

Answers

This follows a simple conversion technique. Basically what the question is trying to say here is to convert 29.1 inHg to mmHg. 1 inHg is equal to 25.4 mmHg so 29.1 inHg would be equal to [tex]25.4 * 29.1[/tex] which when evaluated turns out to be: [tex]739.14[/tex]. :D

The pressure will be 739.14 mm Hg.

What is pressure?

The SI unit measuring pressure would be the pascal, which measures the force of each unit area of the surface.

Calculation of pressure

It is known that 1inHg = 25.4 mm Hg.

Hence, the pressure = 25.4 × 29.1 = 739.14 mm Hg

Therefore, the pressure will be 739.14 mm Hg.

To know more about pressure

https://brainly.com/question/15175692

#SPJ2

Other Questions

Look at image which graph shows T (ABC)? Identify the central idea in Mao Zedong's speech "Serve The People." Select all that apply. A.dying for a cause B.living life to its fullest C.coming together as a nation D.taking advantage of the government What is the polynomial of least degree with the given zeroes -2 and 4? Lexi jarred 2.3 liters of jam after 2 days. How many days does Lexi need to spend making jam if she wants to jar 4.6 liters of jam in all? 3 + 2p - 4 = 11algebra 1 solving equations One of the draw backs of the profitablity index as a criteria for judging whether to accept a capital investment project is that:_______ Please help me I need help?!!! How do facilitators ensure that a group works together effectively? Check all that apply.-They assign time frames for different parts of the project.-They organize the way a group meeting will run.-They assign roles to every member of the group to complete.-They guide discussion so that everyone contributes equally.-They resolve conflicts and make sure all opinions are heard.-They record notes and track key decisions made. pleaseeee hurryyy i needd helpppHow many solutions are there for this equation? Why?2(m+2)=126mSelect the option that correctly answers both questions.a. There is one solution, because the coefficients of the variables on both sides of the equation are the same.b. There are no solutions, because the coefficients of the variables on both sides of the equation are different.c .There is one solution, because the coefficients of the variables on both sides of the equation are different.d. There are no solutions, because the coefficients of the variables on both sides of the equation are the same. Which principle is found in The Declaration of the Rights of Man and in The Citizen? All governments should be direct democracies. A government's power comes from the people. Women should have the right to vote. Constitutions should be based on Christian teaching. For all numbers x, f(x) = 3x + 3. What is the value off(3)? Many counties in Texas missed many school days in the fall of 2017 due to hurricanesthat year. A solution for how to make up those days was to add time to each school dayfor a portion of the year. It was decided that in order to make up a 6 hour school day, 10minutes would be added to each day. How many extended days would be needed tomake up 3 school days? (PEOPLE WHO HAVE READ CORALINE) Can someone please help me? I would give you the world!Coralines Survival Guide to the Other WorldYou will be creating a guidebook to help Coraline navigate the other world. Your guide must tell Coraline what to watch out for and how to deal with the physical, emotional, and mental challenges she faces.You could include Paragraphs like:Beware the Other MotherDont Trust the Other FatherWatch Out for the RatsA Map of the Other WorldYour guide should also include advice on what to do as well as what not to do, who you can trust, and what you need to find.Your guide should be at least 6-8 paragraphs long and contain at least one piece of textual evidence on each slide. Your guidebook should contain pictures and be visually attractive.this is my last try. any greedy people and im quitting brainly. I dont understand why you people do this! I just need help, im crying because 3 people have been greedy and all I need is help. Sorry.. I don't have anymore points to give anymore. this is all I have what is 0.44(534) ?? can someone help me? 11. A condition in which cells that look and act like cells of the ring of the uterus, but are found in other parts of the abdominal cavity is called:herriamenstruationendometriosisovulation A 12 gram piece of Cu at 475 oC is placed in contact with a 15 gram piece of Cr at 265 oC. Assume the two pieces of metal are the system and that there is no heat exchange between system and surrounding.What is the final temperature of the two pieces of metal expressed in degree C? 1pt Which factor was most important for the survival of early humans?O A. the absence of other homininsO B. little or no change in temperatureO C. reliable supplies of food and waterOD. access to materials for making tools What are the solutions to the quadratic equation 4(x + 2)2 = 36 x = 11 and x = 7 x = 7 and x = 11 x = 5 and x = 1 x = 1 and x = 5 Please help me and make sure to round the answers to the nearest hundred. Ill give you brainiest!