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taurus [48]
2 years ago
8

26. Classify each chemical equation as a combination/synthesis , decomposition, single replacement, double replacement, or combu

stion.
a. Pb(s) + Hg2SO4(s)  PbSO4(s) +2 Hg(l)
b. NaCl(aq) + AgNO3(aq)  AgCl(s) + NaNO3(aq)
c. 2 H20(l)2 H2(g) + 02(g)



27. Find the molar mass of nitric acid (HNO3).

28. Avogadro’s number refers to ___.
a. the maximum number of electrons that all of an atom’s energy levels can accommodate
b. the number of protons and neutrons that can fit in the shells of an atom’s nucleus
c. the number of particles in one mole of a substance
d. the number of particles in exactly 1.0 g of a substance


29. How many moles of oxygen atoms are in 1.5 moles of CO2? (Sc2c)
a. 1 mol b. 1.5 mol c. 2 mol d. 3 mol

30. What is the mass of 0.28 mol of iron ?

Chemistry
1 answer:
Natali [406]2 years ago
8 0

These are the answers.


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Select the correct answer from each drop-down menu. consider the substances hydrogen (h2), fluorine (f2), and hydrogen fluoride
nasty-shy [4]

The boiling point of HF is higher than the boiling point of H_2, and it is higher than the boiling point of F_2.

<h3>What is the boiling point?</h3>

The boiling point is the temperature at which the pressure exerted by the surroundings upon a liquid is equalled by the pressure exerted by the vapour of the liquid.

F_2 has weak dispersion force attractions between its molecules, whereas liquid HF has strong ionic interactions between H^+ and F^- ions.

Only London Forces are formed - Therefore more energy is required to break the intermolecular forces in HF than in the other hydrogen halides and so HF has a higher boiling point.

H_2 and F_2 will only have intra-molecular attractions and there will be no hydrogen bonds present in them. As a result, their boiling point will be lower.

Hence, the boiling point of HF is higher than the boiling point of H_2, and it is higher than the boiling point of F_2.

Learn more about the boiling point:

brainly.com/question/25777663

#SPJ1

7 0
1 year ago
The half life for the first order conversion of A to B is 56.6 hours. How long does it take for the concentration of A to decrea
sveta [45]

Answer:

It will take 188.06 hours for the concentration of A to decrease 10.0% of its original concentration.

Explanation:

A → B

Initial concentration of the reactant = x

Final concentration of reactant = 10% of x = 0.1 x

Time taken by the sample, t = ?

Formula used :

A=A_o\times e^{-\lambda t}\\\\\lambda =\frac{0.693}{t_{\frac{1}{2}}}

where,

A_o = initial concentration of reactant

A = concentration of reactant left after the time, (t)

t_{\frac{1}{2}} = half life of the first order conversion  = 56.6 hour

\lambda = rate constant

A=A_o\times e^{-(\frac{0.693}{t_{1/2}})\times t}

Now put all the given values in this formula, we get

0.1x=x\times e^{-(\frac{0.693}{56.6 hour})\times t}

t = 188.06 hour

It will take 188.06 hours for the concentration of A to decrease 10.0% of its original concentration.

4 0
3 years ago
Element whose atoms have completed their outer energy level are the ____​
umka21 [38]

Answer:

Noble gases

Explanation:

nobles gases have their outer energy level complete

5 0
2 years ago
Why pie bond are not perticipate in hybridaization​
DedPeter [7]
The first bond between two atoms is always a sigma bond and the other bonds are always pi bonds and a hybridized orbital cannot be involved in a pi bond. Thus we need to leave one electron (in case of Carbon double bond) to let the Carbon have the second bond as a pi bond.
3 0
2 years ago
In what month does winter begin in the southern hemisphere
Katyanochek1 [597]

In the Southern Hemisphere this would be around June 20 and culminates on September 22.

7 0
3 years ago
Read 2 more answers
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