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3 years ago

Which reaction occurs spontaneously?

2 answers:

7 0

The reaction occurs spontaneously is Cl2(g) + 2NaBr(aq)-->Br2(l) + 2NaCl(aq). The answer is number 1. The rest of teh choices do not asnwer the question above.

WARRIOR [948]3 years ago

4 0

The answer is: (1) Cl2(g) + 2NaBr(aq)-->Br2(l) + 2NaCl(aq).

In this chemical reaction chlorine change oxidation number from 0 to -1 (reduction) and bromine change oxidation number from -1 to 0 (oxidation).

Chlorine is stronger oxidation reagent than bromine.

In VIIA or group 17 (halogen elements) there are six elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At) and tennessin(Ts).

They have high electronegativity because they have seven valence electrons in their outermost energy level, so they can gain an electron to have the octet rule.

Going down in the group, element are weaker oxidazing reagent and less reactive.

Electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

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Complete combustion of a 0.350 g sample of a compound in a bomb calorimeter releases 14.0 kJ of heat. The bomb calorimeter has a

dexar [7]

Answer:

Its final temperature is 25.8 °C

Explanation:

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

There is a direct proportional relationship between heat and temperature. The constant of proportionality depends on the substance that constitutes the body as on its mass, and is the product of the specific heat by the mass of the body. So, the equation that allows calculating heat exchanges is:

Q = c * m * ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation (ΔT=Tfinal-Tinitial)

When a body transmits heat there is another that receives it. This is the principle of the calorimeter. Then the heat released by the compound will be equal to the heat obtained by the calorimeter.

In this case, you know:

Q= 14 kJ= 14,000 J

c= 3.55 $\frac{J}{g*C}$

m=1.20 kg= 1200 g (1 kg=1000 g)
Tfinal= ?
Tinitial= 22.5 °C

Replacing:

$14,000 J= 3.55 \frac{J}{g*C}*1200 g*(Tfinal-22.5C)$

Solving:

$\frac{14,000J}{3.55\frac{J}{g*C} *1200 g} =T final - 22.5C$

3.3=Tfinal - 22.5 C

3.3 + 22.5=Tfinal

Tfinal= 25.8 °C

Its final temperature is 25.8 °C

3 0

3 years ago

Read 2 more answers

The rock outcrop, shown above demonstrates the law of included fragments. Identify the correct definition for the law of include

Radda [10]

Answer:

Explanation:

The law of included fragments states: Fragments found in a rock must be older than the rock itself.

7 0

2 years ago

An average microwave uses a frequency of 2.54 GHz. How much energy is emitted?

romanna [79]

Answer:

0.120 m

Explanation:

What you need to know here is that frequency and wavelength have an inverse relationship as described by the equation

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4 0

2 years ago

Which statement is true about compounds? They do not form living things. They do not form nonliving things. They are formed when

oksano4ka [1.4K]

Answer:

The true statement is:

They are formed when atoms of different elements combine.

Explanation:

Compounds are formed when atoms of different elements combine.

Atoms of different elements combine with each other to attain stable electronic configuration.

The atoms can combine with each other in two different ways:

1) By sharing the electrons

2) By exchanging electrons

When they share electrons with each other, they form a covalent bond.

When they exchange electrons, they form an ionic bond.

3 0

3 years ago

Taste buds at the back of your tongue are most responsive to sweet. True False

Nostrana [21]

They show equal response to every kind of taste , doesn't matter if sour , salty , sweet , pungent etc . that depends on what the person likes the most , if you like sugary edibles , then the brain would sense it and be happy about it , and show a greater tendency towards it.

5 0

2 years ago