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3 years ago

Why might it be important in a real life situation, to know if a chemical or physical change occurred?

1 answer:

6 0

There are four signs that a chemical reaction has occurred: a change in color, a change in temperature, formation of a gas or formation of a precipitate. A precipitate is a solid that forms when two liquid solutions are mixed. As matter changes in a chemical reaction, it can either absorb or release energy.

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Why is galvanized steel preferred for outdoor uses?

Marizza181 [45]

Galvanized steel is preferred for outdoor uses because it is ideal to prevent rotting/corrosion A steel will rot more quickly if it's exposed to a larger amount of oxygen and H2O , which will exist if we put it oudoor Coating the steel with additional zinc will slow down the process

7 0

2 years ago

Describe the relationship between the radius of a cation and that of the atom from which it is formed. a. cations are much small

koban [17]

<h3>Answer;</h3>

Cations are much smaller than their corresponding parent

<h3>Explanation;</h3>

Parent atom has more electrons and thus the effective nuclear charge on each electron is less.
When a cation is formed electron(s) is/are lost. Thus the effective nuclear charge or simply put, the attraction of the nucleus towards the electrons increases. Therefore, due to greater pull, the nucleus pulls the shells towards it, there by reducing the size, which makes cations smaller than their corresponding parent.

3 0

3 years ago

What mass of helium is in a 2.00 L balloon at STP? pls help me lol

sertanlavr [38]

Once upon a time there was a lovely

princess. But she had an enchantment

upon her of a fearful sort which could

only be broken by love's first kiss.

She was locked away in a castle guarded

by a terrible fire-breathing dragon.

Many brave knights had attempted to

free her from this dreadful prison,

but non prevailed. She waited in the

dragon's keep in the highest room of

the tallest tower for her true love

and true love's first kiss. (laughs)

Like that's ever gonna happen. What

a load of - (toilet flush)

Allstar - by Smashmouth begins to play. Shrek goes about his

day. While in a nearby town, the villagers get together to go

after the ogre.

3 0

2 years ago

For an ideal gas, evaluate the volume occupied by 0.3 mole of gas.

Serhud [2]

Answer:

V=0.3×22.4=6.72 liters hope this helps

8 0

2 years ago

ethanol is a common laboratory solvent and has a density of 0.789 g/mL. what is the mass, in grams, of 151 mL of ethanol

natta225 [31]

V = 151 mL = 151 cm³
d = 0,789 g/mL = 0,789 g/cm³
--------------------------------------

d = m/V
m = d×V
m = 0,789×151
m = 119,139g

3 0

3 years ago

Read 2 more answers