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pav-90 [236]
3 years ago
5

Why don't we use meters or miles when discussion distances between stars or galaxies?

Chemistry
1 answer:
taurus [48]3 years ago
4 0
If we use mile or something else it will be hard to measure in sky .
Because the mile or meters too short for the space,
Galaxy and stars are too long far away from us if we use mile or meter,
It till be take like miliion year to measure.


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Substances that are more dense have ___________ (lower or higher) specific gravity.
natita [175]

Answer:

Higher

Explanation:

The answer is higher because Specific gravity is the density of a substance divided by the density of water.  Specific gravity is almost always very close to the same value as the density is, meaning the higher, or more dense, a substance is, the higher the specific gravity is.

4 0
3 years ago
Assume that the total volume of a metal sample is the sum of the volume occupied by the metal ions making up the lattice and the
mojhsa [17]

Answer:

92.4%

Explanation:

The volume per cubic meter of sodium preoccupy by the sodium ions is

V_{Na}  =    n \times V

where;

volume (V) of each Na atom   = \dfrac{ 4}{3}  \pi r^3

Radius of each ion = 97.3 pm = 97.3 × 10⁻¹²

no.of atoms in the sample n =  mass of the sample / ( molar mass / NA)

mass of the sample per cubic metre =  911 kg/m³

∴

V = \bigg [ \dfrac{4}{3} \pi r^3 \bigg ] \bigg [\dfrac{MN_A}{m} \bigg ]

V = \bigg [ \dfrac{4}{3} \pi (97.3 \times 10^{-12} )^3 \bigg ] \bigg [\dfrac{ (911 kg/m^3 (m^3))(6.023\times 10^{23})}{27.7 \times10^{-3}\  kg/mol } \bigg ]

V = 0.07643 m³

The fraction of available conduction electrons are;

= (1 - V)

= 1 - 0.07643

= 0.92357

≅ 92.4%

5 0
3 years ago
A _____ is a new substance formed in a chemical reaction.
Lorico [155]
B. product
Think about it like this: a company produces products, not coefficients.
5 0
3 years ago
If you dissolve 0.1 mol of formic acid in 1 L of water, ther esulting solution contains 0.004 mol of H₃O+. Based on this informa
zhuklara [117]

In an ideal case, the acid would completely protonate. such an acid would be a strong acid.  Dissociation of Formic acid looks like:

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one mole of formic acid should give one mole of Hydronium(H₃O⁺) ions

similarly, 0.1 moles of formic acid should produce 0.1 moles of hydronium ions. but we know that it is not the case, a much lesser amount is actually formed.

Which means that Formic acid did not completely dissociate into COOH⁻ and H⁺ ions.

Hence, Formic Acid is a weak acid

5 0
3 years ago
Part B<br> Do you think that the phases of the moon follow a pattern
Ludmilka [50]
The most obvious patterns of the moon are the phases of the moon, which move in a month-long cycle. Because the moon reflects its light from the sun, only the part of the moon that faces the sun is visible. The full moon is when the entire moon is visible
4 0
3 years ago
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