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Alecsey [184]
3 years ago
7

Which element can join with other elements to form covalent bonds? beryllium (Be) carbon (C) cesium (Cs) iron (Fe)

Chemistry
2 answers:
Agata [3.3K]3 years ago
6 0

Answer:

It’s C

Explanation:

Rainbow [258]3 years ago
4 0

Answer:

Carbon (C)

Explanation:

Carbon is the only nonmetal there and covalent bonds happen between two nonmetal atoms

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How many kilojoules are released when 8.2 g of water condenses at 100 °c and cools to 15 °c?
MrRa [10]

Answer:- 2.92 kJ of heat is released.

Solution:- We have water at 100 degree C and it's going to be cool to 15 degree C.

So, change in temperature, \Delta T = 15 - 100 = -85 degree C

mass of water, m = 8.2 g

specific heat of water, c = 4.184\frac{J}{^0C.g}

The equation used for solving this type of problems is:

q=mc\Delta T

Let's plug in the values in the equation and solve it for q which is the heat energy:

q = (8.2)(4.184)(-85)

q = -2916.248 J

They want answer in kJ. So, let's convert J to kJ and for this we divide by 1000.

q=-2916.248J(\frac{1kJ}{1000J})

q = -2.92 kJ

Negative sign indicates the heat is released. So, in the above process of coiling of water, 2.92 kJ of heat is released.

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3 years ago
How does the density of one penny compare with the density of two pennies
Mice21 [21]
Density increases.......
6 0
3 years ago
When an oxygen atom is attached to a carbon atom the carbon atom becomes more?
Ad libitum [116K]
When an oxygen atom is attached to a carbon atom, the carbon atom becomes reduced.
5 0
3 years ago
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cylinder contains 250 g of Helium at 200 K. The external pressure is constant at 1 atm. The temperature of the surroundings is l
brilliants [131]

Answer:

The system gains 126100 J

Explanation:

The heat can be calculated by the equation:

Q = nxCxΔT, where Q is the heat, C is the heat capacity,n is the number of moles and ΔT is the variation of temperature (final - initial). The number of moles is the mass divided by the molar mass, so:

n = 250/4 = 62.5 mol.

The system must be in thermal equilibrium with the surroundings, so if the temperature of the surroundings decreased 97 K, the temperature of the system increased by 97 K, so ΔT = 97 K

Q = 62.5x20.8x97

Q = 126100 J

6 0
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Characteristic of enzymes allows it to be highly specific in the reactions they catalyze?
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The way that an enzyme forms from a polypeptide bond and the bonds formed between it caracterise the enzymes active site 

the active site is specific to certain substrates which are catalysed 
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