Which best describes the difference between a physical change and a chemical change? A. A chemical change does not result in a new substance being formed, whereas a physical change does.

B. A physical change is a change from one state of matter to another; a chemical change results in a new substance formed.

C. A physical change produces a new element, and a chemical change results in a bond breaking between atoms.

D. A chemical change results in a new element being formed, and a physical change results in a new compound being formed.

Answers

Answer 1

Answer:

Answer:

The correct answer is B.

A physical change is a change from one state of matter to another; a chemical change results in a new substance formed.

Physical properties:

Physical properties are those which have same composition. In other words, composition does not change, only state may be change like solid to liquid, liquid to gas, solid to liquid etc.

Example.

Water when freezes into ice, it is physical change, just state is change.

Chemical properties:

The chemical properties depend upon composition.

Example:

Formation of precipitates is an example of chemical change.

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Chemist preformed Reaction of solid magnesium burning and found that the mass of the magnesium oxide what is greater than the mass of the magnesium. What is the reason behind this increase in math reaction of solid magnesium burning and found that the mass of the magnesium oxide what is greater than the mass of the magnesium. What is the reason behind this increase in mass?

Answers

Answer:

The magnesium reacted with the oxygen in the air.

Explanation:

For argument’s sake, let’s say that the mass of magnesium oxide was 3 g and that of the oxide was 5 g.

The reaction was

magnesium + oxygen ⟶ magnesium oxide

Mass: 3 g 5 g

Mass of oxygen = 5 g – 3 g = 2 g

The 3 g of magnesium must have combined with 2 g of oxygen to form 5 g of magnesium oxide.

Which metal does not form cations of differing charges? ( Which metal is NOT a transition metal?)A) Na

B) Cu

C) Co

D) Fe

E) Sn

Answers

The metal that does not form cations of differing charges is Sodium (Na).

The transition metals refers to the group of metals which one can find in the middle of a periodic table. Some of the metals that are able to form cations with different charges include:

Chronium (Cr)

Iron (Fe)

Cobalt (Co)

Copper (Cu)

Tin (Sn) ,

Mercury (Hg)

Lead (Pb)

It should be noted that Sodium (Na) is a metal metal that does not form cations of differing charges.

Therefore, the correct option is A.

Read related link on:

brainly.com/question/12843347

Answer:Na

Explanation:its not in group 3 to 13 hope this helps god bless

Define chemical change and give an example

Answers

Definition-A formation of new chemical substances.
Example- Sugar undergoes a chemical change when it is cooked to make caramel. :3

Hope I helped! Sorry if it's bad.

Chemical changes are the chemical properties associated with a specific matter.

Examples include toxicity, reactivity, stability, flammability, etc.

A mole or fraction of a mole represents a ____ number of atoms or molecules.A : specific

B : nonspecific

Answers

Answer:

specific

Explanation:

a mole represents the amount of grams it takes to have avogadro's number

Answer:

A is your answer

Explanation:

Can someone please help me in number 1 and 2 thankss

Answers

1. New moon, waxing gibbous, Full moon, and waning crescent are the main ones but there are more.

2. The revolution of the Earth is 365.25 days while the revolution of the moon is 28 days. Also, the Earth orbits the sun while the moon orbits the Earth and vaguely orbits the sun due to the orbit of the Earth.

3. Tidal waves, seasons, and the lunar cycle.

4. Moonlight is light that is reflected off the moon's surface that comes from the sun. This "lights" the moon up. Sunlight is light that comes from the sun which is made by a bunch of chemical reactions.

Good luck!

When does incomplete combustion occur?A.
sufficient supply of oxygen

B.
insufficient supply of carbon dioxide

C.
sufficient supply of carbon dioxide

D.
insufficient supply of oxygen

Answers

Answer:

D. insufficient supply of oxygen

Explanation:

Combustion is an exothermic reaction which involves the burning of a compound in the presence of oxygen. Combustion is a very useful life process as it produces heat and light.

For a complete combustion reaction to occur, the compound must be burnt over excess oxygen. The product is usually carbondioxide and water with release of some particulate matter.

In incomplete combustion, there is deficiency of oxygen. Here, oxygen becomes the limiting agent and it drives the reaction to an end. Incomplete combustion is always accompanied with the production of poisonous carbon monoxide and Carbon. We see incomplete combustion when smoke forms or when burning is accompanied by production of soot.

What makes a combustive process complete or not is the availability of oxygen gas for the reaction.

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