CHEMISTRY HIGH SCHOOL

The Metal Wire In An Incandescent Lightbulb Glows When The Light Is Switched On And Stops Flowing When It Is Switched Off. This Simple Process Is Which Kind Of Change?

Answers

Answer 1
Answer:

Answer: physical change

Explanation:

A physical change is defined as a change in which there is alteration in shape, size etc. No new substance gets formed in these changes

Example: Melting of ice

A chemical change is defined as a change in which a change in chemical composition takes place. A new substance is formed in these changes.

Example: Corrosion of iron called as rusting.  

Thus when the metal wire in an incandescent light bulb glows when the light is switched on and stops flowing when it is switched off is just a physical change as there is no change in chemical composition.
Answer 2
Answer: Physical Change. If matter is not chemically changing, then its a physical change.

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Which metal is more active than NI and less active than Zn?1. Cu
2. Cr
3. Mg
4. Pb

Answers

Answer : The correct option is, (2) Cr (Chromium)

Explanation :

The reactivity series of metal are arranged of the reactivity from the highest to the lowest. Reactivity series is used to determine the products of the single displacement reactions. In the single displacement reaction, the most reactive metal displaces the least reactive metal.

From the given reactivity series we conclude that there are two metal (Mg and Cr) are more reactive metal than the Ni and there are two metal (Pb and Cr) are less reactive metal than the Zn. So, the Cr (Chromium) is the metal which is more active than Ni and less active than Zn.

Hence, the correct option is, (2) Cr
Cr is more active than nickel and less active than zinc.

What is inert pair effect​

Answers

Answer:

The inert pair effect is the tendency of the two electrons in the outermost atomic s-orbital to remain unshared in compounds of post-transition metals. The term inert pair effect is often used in relation to the increasing stability of oxidation states that are two less than the group valency for the heavier elements of groups 13, 14, 15 and 16. .[1] The name suggests that the outermost s electrons are more tightly bound to the nucleus in these atoms, and therefore more difficult to ionize or share

What is the empirical formula for a compound if a sample contains 3.72g of P and 21.28g of Cl?

Answers

The empirical formula or simplest formula gives the smallest whole-number ratio of the atoms present in a compound.It gives the relative number of atoms of each element present in the compound.The ratio will be              3.72 : 21.28

The point at which a substance is at complete equilibrium is called? User: a hydrogen bond is a special form of what type of bond

Answers

I don't know what the answer to your first question is. All of my teachers have only called it the equilibrium point.  However for your second question, a hydrogen bond is a special type of dipole-dipole attraction.  Only oxygen, nitrogen, and fluorine are able to make them when bonded with hydrogen.  Hydrogen bonding is what makes water have such a high boiling point considering how light the molecule is.

If 37.4 grams of water decompose at 297 Kelvin and 1.30 atmospheres, how many liters of oxygen gas can be produced? Show all of the work used to solve this problem. 2H2O (l) yields 2H2 (g) + O2 (g)

Answers

To determine the liters of oxygen gas, we convert the 37.4 grams of water to moles, which is 2. 078 moles. The moles oxygen is half the moles of water which is equal to 1.039 moles. Using ideal gas equation, PV=nRT, we get the volume from the given temperature and pressure. The volume is 19.49 liters.

Which of these would be easily soluble in water?a. salt
b. oil
c. aluminum foil

Answers

A) Salt, because salt can easily dissolve in water. Oil would not dissolve or evaporate in water (think of an oil spill - does that oil dissappear?). Aluminum foil would definitely not dissolve in water, so it is not soluble.

Answer:

salt

Explanation:

because is logic sense lol
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