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3 years ago

Explain how matter is not created or destroyed when there are chemical and physical changes.

2 answers:

4 0

When 2 different kinds of matter make contact, if they react to each other, they simply exchange atoms, not making any new matter in the process, they simply gets turned into something different.

bija089 [108]3 years ago

4 0

Matter is neither created nor destroyed during a chemical or physical reaction but changes from one form to another, for example when we burn wood this is a chemical reaction by burning the wood we are not destroying it we are just changing it to a different form which is charcoal, also melting ice is a physical reaction here we are changing the ice from solid to liquid (water).

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Which substance is used to remove rust from metal

wel

Chemically speaking, rust is a base and any acid will remove it. The choice of acid is going to be the thing to consider, since acid + base = salt and water. Phosphoric acid left a residue because the salt Iron phosphate is insoluble in water. Iron's soluble salts include the chloride, the sulfate and the nitrate. Industrially speaking, you need to "pickle" your iron. Pickling is a process in which dilute sulfuric acid is used to remove any surface corrosion prior to either painting or plating an iron surface. Sulfuric acid is ordinary battery acid and the salt Iron sulfate is not toxic. Sulfuric acid is one of the most common acids used (besides hydrochloric acid). The dilute kind is not terribly corrosive but concentrated sulfuric acid is a thick, syrupy liquid which can cause some nasty chemical burns if allowed to remain on the skin. It also heats up quite a lot when water is added, so this is an "Acid to water not water to acid" situation. The other choice is Hydrochloric acid, known as muriatic acid. The 20% concentrate is available in nearly any hardware store. It isn't as corrosive as concentrated sulfuric acid, but it has a burning, acrid stench, so never use the concentrate without adequate ventilation. It is ordinarily used to remove hard water deposits (boiler scale) but does a good on on rust as well. Concentrated Iron chloride isn't entirely inert but lots of rinsing will turn it back into harmless rust/sludge, especially if the rince water is naturally hard. Nitric acid will remove corrosion from anything, but it is extremely corrosive, smells worse then Hydrochloric acid and isn't easy to get, since it can be used to create some powerful explosives

3 0

3 years ago

Read 2 more answers

Any atom is most stable when it’s outermost energy level contains

slamgirl [31]

Explanation:

Atoms are at their most stable when their outermost energy level is either empty of electrons or filled with electrons. Sodium atoms have 11 electrons. Two of these are in the lowest energy level, eight are in the second energy level and then one electron is in the third energy level.

6 0

2 years ago

What mixture is it ?

joja [24]

The mixture should be

Heterogeneous

Explanation:

Definition: Diverse in character or content.

7 0

3 years ago

2.1 x 10^-3 x 2 x 10^2 =

Bumek [7]

Answer:

I believe it is B

Explanation:

hope it helps. please let me know if it's wrong

4 0

2 years ago

Consider the combustion of h2(g) 2h2(g)+o2(g)→2h2o(g). If hydrogen is burning at the rate of 0.49 mol/s, what is the rate of con

mamaluj [8]

Answer : The rate of consumption of oxygen = 0.245 mol/s

Solution : Given,

Rate at which Hydrogen burns = 0.49 mol/s

The Reaction is,

$2H_{2}(g)+O_{2}(g)\rightarrow 2H_{2}O(l)$

In this reaction, 2 moles of hydrogen react with the 1 mole of oxygen.

The rate at which oxygen burns is equal to the half of rate at which hydrogen burns.

Rate at which Oxygen burns = $\frac{1}{2}$ × 0.49 mol/s

= 0.245 mol/s

5 0

2 years ago