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Norma-Jean [14]
3 years ago
13

If density usually increases with decreasing temperature, why does ice float on liquid water? Explain.

Chemistry
1 answer:
zepelin [54]3 years ago
6 0

Answer:

If you continue to cool water past 4 degrees Celsius, its density starts to plummet (you can see this in the graph). At zero degrees, i.e., the temperature at which water turns into ice, the density of water is actually quite low. It turns out that ice has a lower density than water, and any object that has a lower density than the liquid form on which it’s kept (in this case, water) will be able to float!

Explanation:

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Which of the following describes the correct order for relative solubility of minerals in sedimentary rocks?
NARA [144]

Answer:

Evaporate minerals are more soluble than calcite and quartz.

Explanation:

Evaporate minerals are the water soluble minerals which at higher concentration precipitate out and crystallized forming rocks.

example of chemicals present are:

chlorides and sulphates.

Quartz is silica (very less soluble, or insoluble)

Calcite is calcium carbonate, again an insoluble salt.

Thus

Evaporate minerals are more soluble than calcite and quartz.

8 0
3 years ago
Hydrogen and nitrogen react to produce ammonia gas as shown in the following chemical
DerKrebs [107]

Explanation:

31.5 \: g \: aommnia \:  \times  \:  \frac{1 \: mol \: ammonia}{8 \: g \: ammonia \: } \:  \times  \frac{3 \: mol \: hydrogen}{2 \: mol \: ammonia} \:  \times  \frac{1 \: g \: hydrogen}{1 \: mol \: hydrogen}  =  \: 5.90625 \: g \: hydrogen \: must \: react \:

5 0
3 years ago
For the reaction C2H4(g) + H2O(g) --> CH3CH2OH(g)
Dominik [7]

Answer : The value of equilibrium constant for this reaction at 262.0 K is 3.35\times 10^{2}

Explanation :

As we know that,

\Delta G^o=\Delta H^o-T\Delta S^o

where,

\Delta G^o = standard Gibbs free energy  = ?

\Delta H^o = standard enthalpy = -45.6 kJ = -45600 J

\Delta S^o = standard entropy = -125.7 J/K

T = temperature of reaction = 262.0 K

Now put all the given values in the above formula, we get:

\Delta G^o=(-45600J)-(262.0K\times -125.7J/K)

\Delta G^o=-12666.6J=-12.7kJ

The relation between the equilibrium constant and standard Gibbs free energy is:

\Delta G^o=-RT\times \ln k

where,

\Delta G^o = standard Gibbs free energy  = -12666.6 J

R = gas constant  = 8.314 J/K.mol

T = temperature  = 262.0 K

K = equilibrium constant = ?

Now put all the given values in the above formula, we get:

-12666.6J=-(8.314J/K.mol)\times (262.0K)\times \ln k

k=3.35\times 10^{2}

Therefore, the value of equilibrium constant for this reaction at 262.0 K is 3.35\times 10^{2}

3 0
4 years ago
List the following elements in order , from best to worst conductor of electric current : silicon , copper, iodine.
Bingel [31]

Answer:

Iodine, Silicon, Copper.

Explanation:

Iodine is an insulator, which doesn't conduct electricity. Silicon is a semiconductor. Copper is a conductor.

8 0
3 years ago
What is the definition of an atomic radius
chubhunter [2.5K]

Answer:

iIllustrated Glossary of Organic Chemistry - Atomic radius. Atomic radius: The radius of an atom. This distance between an atom's nucleus and outer electron shell. ... Atomic radius differs with the bonding state of an atom (for example an nonbonded atom of an element versus the same element within a covalent bond).

5 0
3 years ago
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