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schepotkina [342]
3 years ago
10

Need help please help me

Chemistry
1 answer:
Mademuasel [1]3 years ago
8 0

Answer:

The answer is most likely compound a

Explanation:

Covalent compounds have low melting and boiling points and conduct electricity poorly

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How many significant figures are in 0.00102?
zaharov [31]

Answer:

3

Explanation:

102 are significant figures

7 0
2 years ago
Read 2 more answers
What can be said about an Endothermic reaction with a negative entropy change?The reaction isa. spontaneous at all temperatures.
Lyrx [107]

Answer:

1. d. The reaction is spontaneous in the reverse direction at all temperatures.

2. c. The reaction is spontaneous at low temperatures.

Explanation:

The spontaneity of a reaction is associated with the Gibbs free energy (ΔG). When ΔG < 0, the reaction is spontaneous. When ΔG > 0, the reaction is non-spontaneous. ΔG is related to the enthalpy (ΔH) and the entropy (ΔS) through the following expression:

ΔG = ΔH - T. ΔS  [1]

where,

T is the absolute temperature (T is always positive)

<em>1. What can be said about an Endothermic reaction with a negative entropy change?</em>

If the reaction is endothermic, ΔH > 0. Let's consider ΔS < 0. According to eq. [1], ΔG is always positive. The reaction is not spontaneous in the forward direction at any temperature. This means that the reaction is spontaneous in the reverse direction at all temperatures.

<em>2. What can be said about an Exothermic reaction with a negative entropy change?</em>

If the reaction is exothermic, ΔH < 0. Let's consider ΔS < 0. According to eq. [1], ΔG will be negative when |ΔH| > |T.ΔS|, that is, at low temperatures.

3 0
3 years ago
Find the solution to the question
Evgesh-ka [11]

Answer:

B

Explanation:

FUN is not building block of matter.

4 0
2 years ago
What is the ph of a 2.00 m hno2 solution if ka=5.00 e-6?
zysi [14]

Answer: -

2.5

Explanation: -

Initial [HNO₂] = 2.00 M

ka = 5.00 x 10 ⁻⁶

ICE table for HNO₂ =

[\left[\begin{array}{cccc}concentrations&HNO2&H+&NO2\\Initial&2.00&0&0\\Change&-x&+x&+x\\Equilibrium&2.00-x&x&x\end{array}\right]

Ka = \frac{x2}{2.00-x}

5.00 x 10-6 = \frac{x2}{2.00-x}

x = 0.0032 M

pH = - log [H⁺]

= - log 0.0032

= 2.5

6 0
3 years ago
When a strontium atom loses two electrons, it becomes a(n) _____ with a charge of _____?
Iteru [2.4K]
<span>When a strontium atom loses two electrons, it becomes a(n) cation with a charge of 2+.
when any neutral atom loses an electron it becomes cation that is positively charged ions and an ion gets the charge according to the number of electrons loses. And if an atom gains an electron it becomes anion that is negatively charged ions.</span>
7 0
3 years ago
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