3 years ago

How can you determine if a molecule is held together by covalent bonds?

Chemistry

1 answer:

goldfiish [28.3K]3 years ago

6 0

You can determine this by looking at the lewis dot structure of the molecule

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How much heat is released as the temperature of 25.2 grams of iron is decreased from 72.1°C to 9.8°C? The specific heat of iron

prisoha [69]

Answer:

$Q=-697.06\ J$

Negative sign says that release of heat.

Explanation:

The expression for the calculation of the heat released or absorbed of a process is shown below as:-

$Q=m\times C\times \Delta T$

Where,

$\Delta H$ is the heat released or absorbed

m is the mass

C is the specific heat capacity

$\Delta T$ is the temperature change

Thus, given that:-

Mass = 25.2 g

Specific heat = 0.444 J/g°C

$\Delta T=9.8-72.1\ ^0C=-62.3\ ^0C$

So,

$Q=25.2\times 0.444\times -62.3\ J=-697.06\ J$

Negative sign says that release of heat.

8 0

3 years ago

PLEASE HELP

otez555 [7]

Answer:

P2≈393.609Kpa so I think the answer is 394 kPa

Explanation:

PV=mRT Ideal Gas Law

m and R are constant because they dont change for the problem. That means

PV/T=mR = constant

so P1*V1/T1=P2*V2/T2 and note that the temperatures are in absolute temperatures (Kelvin) because you can't divide by zero.

So P2 = P1*V1*T2/(V2*T1) = 101325 Pa * 700 mL * 303K/(200 mL*273K)

P2 = 393609 Pa

5 0

3 years ago

Read 2 more answers

1. Cp is smaller than Hx

andreev551 [17]

1 has a higher ionization dismal aoa

8 0

2 years ago

Need help answering this question

a_sh-v [17]

Answer:

1st = saturated

Explanation:

Bro first ka answer saturated he

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2 years ago

Which is the correct electron configuration for sodium?

sattari [20]

Explanation:

Ne] 3s¹ is the answer your welcome

7 0

2 years ago