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ryzh [129]
3 years ago
13

Samantha AS

Chemistry
1 answer:
Anestetic [448]3 years ago
8 0

Answer:

Fe(NO2)3

Explanation:

A poly atomic ion is an ion that contains more than one atom.

If we look at all the compounds that have been mentioned among the options; KBr and NaF are both ionic but do not contain any covalent poly atomic ion.

However, Fe(NO2)3  contains NO2^+ which is a poly atomic ion that contains the covalent bond.

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An unknown metal has a mass of 86.8 g. When 5040 J of heat are added to the sample, the sample temperature changes by 64.7 ∘ C .
grandymaker [24]

Answer: The specific heat of the unknown metal is 0.897J/g^0C

Explanation:

The quantity of heat required to raise the temperature of a substance by one degree Celsius is called the specific heat capacity.

Q=m\times c\times \Delta T

Q = Heat absorbed=5040 Joules

m= mass of substance = 86.8 g

c = specific heat capacity = ?

Initial temperature of the water = T_i

Final temperature of the water = T_f

Change in temperature ,\Delta T=T_f-T_i=(64.7)^0C

Putting in the values, we get:

5040=86.8\times c\times 64.7^0C

c=0.897J/g^0C

The specific heat of the unknown metal is 0.897J/g^0C

4 0
3 years ago
PLEASE HELP
Ipatiy [6.2K]

Your answer should be “C.”

MARK ME BRAINLIEST PLEASE!!!!!!

6 0
3 years ago
Read 2 more answers
A transformer has 90 turns in the primary coil and 9 turns in the secondary coil If the output voltage is 6 V, what is the input
Afina-wow [57]

Answer:

60 V

Explanation:

From;

Vs/Vp = Ns/Np

Where;

Vs = voltage in the secondary coil = 6V

Vp = voltage in the primary coil= ??

Ns = number of turns in the secondary coil = 9

Np= number of turns in the primary coil = 90

6/Vp = 9/90

Vp= 90 * 6/9

Vp=  60 V

6 0
3 years ago
The number of electrons in a neutral atom is equal to the number of protons? True or false
NNADVOKAT [17]

Answer:

true

Explanation:

in order for the atom to be neutral the number of protons and electrons have to be the same.

3 0
2 years ago
If the concentration of h uons were to decrease what would happen to the oh ions
stich3 [128]
<span>If the concentration of H⁺ ions will decrease then the concentration of OH⁺ ions will increase.</span>
3 0
4 years ago
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