The melting of gold is a physical change.why?

Answers

Answer 1

Answer: Because when a matter melts (or generally speaking, changes phases) its chemical structure does not change. By change of chemical structure I mean, reaction. When a matter melts it does not react with another one. It does not, give or take electrons to another matter or it does not share with them.

Answer 2

Answer: Melting gold can be reversed. Physical changes are ones that can be reversed, like bending a paperclip or getting whacked with a hammer and getting a dent. Chemical changes can't be reversed: like burning wood, or baking bread.

Related Questions

200 mL of nitrogen gas at 24K is heated to 47K.
Based on the electron configuration,how many valence electrons are in technetium, Tc? 1s²2s²2p63s²3p64s23d¹04p65s24d5 A2 C. 4 B. 5 D. 9
Descreva as principais caracteristícas dos compostos ionicos
How does melting point change as the number of carbon-carbon double bonds increases?
How can we determine if energy was released or absorbed during a reaction?a) Measure the mass of the reaction at the beginning and end b) Measure the temperature of the reaction at the beginning and end c) Measure the volume of the reaction at the beginning and end d) Measure the density of the reaction at the beginning and end

What is the approximate rate of descent required (for planning purposes) to maintain the electronic glide slope at 105 knots ground speed?

Answers

Answer:

555 ft per min

Explanation:

For the problem above, we can use the IAP chart and the ILS RWY 32 L approach. If we consider an electronic glide slope of 3 degrees, with the table of Rate-of-Descent in the IAP chart. Adjusting the angle of descent to 3 degrees and shifting the ground speed to approximately 105 knots, the estimated rate of descent is 555 ft per min.

What is heat?
(in scientific vocab)

Answers

my guess i dont know exactly but heat is energy

heat absorbed or radiated during a change of phase at a constant temperature and pressure. specific heat. the heat required to raise the temperature of one gram of a substance one degree centigrade. heat of condensation. heat liberated by a unit mass of gas at its boiling point as it condenses into a liquid.

What are the inventions of George Ohm or his commonly known name as Ohms Law

Answers

Ohms law is the mathematical relationship among electric current,resistance and voltage.I hope this is good enough

How many atoms of carbon are present in a molecule of :
Fructose and galactose

Answers

In Fructose, there are 4 carbon atoms. Fructose is a 5 atom molecule, and one of these is oxygen, therefore, the other 4 are carbon.
In Galactose, there are 6 carbon atoms.
Hope this helps :)

Answer:

the answer is starch

Explanation: i chose fructose but got it wrong and showed that starch is correct

Which formula represents an unsaturated hydrocarbon? Picture IHow many pairs of electrons are shared between the two nitrogen atoms? Picture II

I NEED EXPLANATION FOR BOTH QUESTIONS, PLEASE HELP ME! :)

Answers

1. Option C, unsaturated compounds are those which have multiple bonds (double, triple bonds between carbon atoms). Among the given, only C has double bond between Carbon atoms hence unsaturated compound.

2. Option A, there is only one pair of electrons between nitrogen atoms . One single covalent bond between two Nitrogen atoms by two electrons or one electron pair.

Unsaturated hydrocarbon: C because there is C=C in the molecule
1 pair of electrons

What is the oxidation number of Mn in KMnO₄? a. -7
b. -3
c. 0
d. +3
e. +7

Answers

I think the answer is e? That's if o is -2 if not it will be a

Other Questions

The scattering of light by a colloid is called the Brownian lighting, Tyndall effect, colloidal scattering, or aggregate reflection.

What measures the mads of an object

Which is denser, isopropyll alcohol( rubbing alchohol) or water?

How many moles of sodium hydroxide are contained in 65.0 mL of a 2.20 M solution?