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3 years ago

Unlike a mixture, a compound has a chemical formula that is always the same. TRUE or FALSE.

1 answer:

4 0

The answer is true, a compound has a chemical formula that is always the same. A chemical formula is a way of expressing the ratios of the atoms in a compound. It represents a compound so it is designated to a specific substance and cannot be changed.

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Does this look correct

Flura [38]

Yeah I think you should send it in

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3 years ago

Can I have some help please on #2,4,5

zzz [600]

It differs because a steam turbine runs off of a magnetic field and a steam engine runs off of coal

hope this helps :)

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3 years ago

The ability to conduct heat is an example of a chemical property. true or false

FrozenT [24]

False the ability to conduct heat is a physical property

7 0

3 years ago

Will a block of material having a volume of 1.97 x 105 cm3 and weighing 1.59 kg float or sink when placed in water? Show calcula

Olenka [21]

Answer:

float

Explanation:

density= mass/ volume (kg/m^3)

1.59 kg/0.197 m^3

=8.07 kg/m^3

density of H2O= 1000 kg/m3

since density(block)<density(H2O), the block will float

(can also be done in g/cm^3)

1590 g/ (1.97*10^5 cm3)= 0.00807 g/cm^3 < 1 g/cm^3 (h2O)

8 0

3 years ago

How many grams of lithium are in 1.25 x 10^26 atoms of Li?

NeX [460]

Mass of Lithium = 1443.73 g ≈ 1.4 kg

<h3>Further explanation </h3>

The mole is the number of particles(molecules, atoms, ions) contained in a substance

1 mol = 6.02.10²³ particles

Can be formulated

N=n x No

N = number of particles

n = mol

No = Avogadro's = 6.02.10²³

The number of atoms of Li = N=1.25 x 10²⁶

mol Li(n) :

$\tt n=\dfrac{N}{No}\\\\n=\dfrac{1.25\times 10^{26}}{6.02\times 10^{23}}\\\\n=2.08\times 10^2$

mass Li (Ar=6.941 g/mol)

$\tt mass=mol\times Ar\\\\mass=208\times 6,941\\\\mass=1443.73~g$

5 0

3 years ago