Test results indicated a chemical change has taken place

1 answer:

5 0

Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color chage, formation of a precipitate, formation of a gas, odor change, temperature change.

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How many electrons are in an uncharged atom of chromium

deff fn [24]

Look up chromium on periodic table.
It's atomic number is 24.
It gives number of protons in an element.
Since the atom is uncharged (no extra or subtracted electrons), the number of protons will equal the number of electrons.

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3 years ago

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What does the term "periodic" mean in the "periodic table of elements"?

Aleks04 [339]

It's the rows. They are periods. (1,2,3,4,5,6,7 - the ones without the letters).

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3 years ago

The molar heat capacity of an unknown substance is 92.1 J/mol-K. If the unknown has a molar mass of 118 g/mol, what is the speci

dlinn [17]

Answer : The specific heat (J/g-K) of this substance is, 0.780 J/g.K

Explanation :

Molar heat capacity : It is defined as the amount of heat absorbed by one mole of a substance to raise its temperature by one degree Celsius.

1 mole of substance releases heat = 92.1 J/K

As we are given, molar mass of unknown substance is, 118 g/mol that means, the mass of 1 mole of substance is, 118 g.

As, 118 g of substance releases heat = 92.1 J/K

So, 1 g of substance releases heat = $\frac{92.1}{118}=0.780J/g.K$

Thus, the specific heat (J/g-K) of this substance is, 0.780 J/g.K

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3 years ago

How many moles of tungsten atoms are in 4.8x10^25 atoms of tungsten?

allsm [11]

Number of moles = number of atoms/Avogadro's number
= (4.8x10^25)/(6.02x10^23)
=79.7 mol (3sf)

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3 years ago

How are the pressure and temperature of a gas related

expeople1 [14]

Answer:

The pressure of a given amount of gas is directly proportional to its absolute temperature, provided that the volume does not change (Amontons's law). ... The volume of a given amount of gas is inversely proportional to its pressure when temperature is held constant (Boyle's law).

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2 years ago

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Test results indicated a chemical change has taken place ​

Test results indicated a chemical change has taken place