CHEMISTRY HIGH SCHOOL

The valence electrons occur in what part of the atom?a. the nucleus
b. in each electron shell
c. the outer electron shell
d. the innermost electron shell

Answers

Answer 1
Answer: The correct answer to the question that is stated above is letter  c,  the outer electron shell.

Valence electrons occur in the outermost shells of an atom.

>> Valence electrons are electrons that are associated with an atom, and that can participate in the formation of a chemical bond.

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Which quantity can vary among atoms of the same element?A) mass numberB) atomic numberC) number of protonsD) number of electrons
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For the reaction C5H5N(aq) + H2O(l) C5H5NH+(aq) + OH-(aq), which of the following is a conjugate acid-base pair? a. C5H5N, C5H5NH+b. C5H5NH+, OH-c. H2O, OH-d. C5H5N, H2O
What is The ratio of atoms in HCI is

Given the balanced equation representing a reaction at 101.3 kPa and 298 K:N2(g) + 3H2(g) => 2NH3(g) + 91.8 kJ
Which statement is true about this reaction?
(1) It is exothermic and DH equals -91.8 kJ.
(2) It is exothermic and DH equals +91.8 kJ.
(3) It is endothermic and DH equals -91.8 kJ.
(4) It is endothermic and DH equals +91.8 kJ.

Answers

Answer (4)

Endothermic processes: are those in which occurs the absorption of heat.
the change of enthalpy (ΔH) is greater than zero.

hope this helps!

In which block of the periodic table is uranium (U) found?

Answers

Uranium is in the "f" block, because it's external electron configuration is 5d^4

Final answer:

Uranium (U) is found in the f-block of the periodic table, specifically in the actinide series.

Explanation:

Uranium (U) is found in the actinide series, which is located in the f-block of the periodic table. The actinide series consists of elements with atomic numbers from 89 to 103. Uranium is the 92nd element, making it part of this series. The f-block is located below the main body of the periodic table, between groups 3 and 4.

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Which of the following statements is true of the critical temperature of a pure substance?A. The critical temperature is the temperature above which the liquid phase of a pure substance can exist.
B. The critical temperature is the temperature above which the liquid phase of a pure substance cannot exist.
C. The critical temperature is the temperature below which the liquid phase of a pure substance cannot exist.
D. The critical temperature is the temperature at which all three phases can coexist.
E. The critical temperature is the temperature at which the pure substance reaches, but cannot go beyond, the critical pressure.
Can someone explain this one?

Answers

B
After temperature reaches certain treshold the difference between density of liquid and gas state disappears, and it is impossible to liquify the substance.

Answer:what do u mean tho

Explanation:

A sample of carbon-12 has a mass of 6.00 g. How many atoms of carbon-12 are in the sample?

Answers

The number of atoms in the 6 grams of carbon is equal to 1.506 × 10²³.

What is Avogadro's number?

The Avogadro number is the proportionality factor which is the number of particles such as atoms, molecules, or ions in one mole of a substance.

Avogadro's number possesses a numeric value of 6.022 × 10²³ reciprocal moles. Avogadro's constant is named by Stanislao Cannizzaro after the scientist Amedeo Avogadro.

Given, the mass of the carbon in sample = 6 g

The number of atoms of one mole of carbon = 6.022 × 10²³

The atomic mass of one mole of carbon = 12 g

It means 12 g of the carbon has atoms = 6.022 × 10²³ carbon atoms

Then  6 grams of carbon will have atoms = (6/12) × 6.022 × 10²³

                                                                     =  3.011 × 10²³ carbon atoms

Therefore, the atoms of carbon in 6 g of sample of carbon are 3.011 × 10²³ atoms.

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Convert grams to moles [grams/molar mass] ~ Moles
Convert moles to atoms [moles * 6.02 x 10^23] = Atoms
Half of 6.02 x 10^23 is 3.01 x 10^23 so here is our answer.

What are four physical properties of aluminum foil?

Answers

1) solid
2) ductile
3) malleable
4) silver in color

Malleable means that it is "flexible" or can be permanently reshaped easily.  Ductile means that it can be drawn out into a wire.  Aluminum foil's state of matter is solid, and it appears in a silver color.
Solid

Shiny

Dole

Conductor if electricity

What term describes matter that is a substance made of different kinds of atoms bonded together?

Answers

compounds or molecules

Answer:

The actual answer is compounds from the science notebook

Explanation:
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