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Oksi-84 [34.3K]
4 years ago
11

Visit the interactive periodic table and locate the element neon (Ne). Use the information within the square to answer these que

stions.

Chemistry
2 answers:
Svetach [21]4 years ago
7 0

Answer:

Atomic number = 10

Mass number = 20

Explanation:

Mass number = neutrons+protons

Mass number = 10+10 = 20

SVETLANKA909090 [29]4 years ago
5 0

Answer:

What is the atomic number of neon?

10

What is the atomic mass of neon? Give your answer to the nearest tenth.

20.2

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What is the balanced equation for the complete combustion of pentane (C5H12)?
LekaFEV [45]
2C5H12 + 16O2 —> 10CO2 + 12H2O

2•5=10 C 10=1•10
2•12=24 H 24=2•12
16•2=32 O 32=(10•2)+(1•12)
=20+12
6 0
4 years ago
What happens at the melting point temperature of a substance?
iren2701 [21]

Answer:

C

Explanation:

Melting point, temperature at which the solid and liquid forms of a pure substance can exist in equilibrium. As heat is applied to a solid, its temperature will increase until the melting point is reached. More heat then will convert the solid into a liquid with no temperature change.

5 0
3 years ago
PbSO4 has a Ksp = 1.3 * 10-8 (mol/L)2.
Oduvanchick [21]

i. The dissolution of PbSO₄ in water entails its ionizing into its constituent ions:

\mathrm{PbSO_{4}}(aq) \rightleftharpoons \mathrm{Pb^{2+}}(aq)+\mathrm{SO_4^{2-}}(aq).

---

ii. Given the dissolution of some substance

xA{(s)} \rightleftharpoons yB{(aq)} + zC{(aq)},

the Ksp, or the solubility product constant, of the preceding equation takes the general form

K_{sp} = [B]^y [C]^z.

The concentrations of pure solids (like substance A) and liquids are excluded from the equilibrium expression.

So, given our dissociation equation in question i., our Ksp expression would be written as:

K_{sp} = \mathrm{[Pb^{2+}] [SO_4^{2-}]}.

---

iii. Presumably, what we're being asked for here is the <em>molar </em>solubility of PbSO4 (at the standard 25 °C, as Ksp is temperature dependent). We have all the information needed to calculate the molar solubility. Since the Ksp tells us the ratio of equilibrium concentrations of PbSO4 in solution, we can consider either [Pb2+] or [SO4^2-] as equivalent to our molar solubility (since the concentration of either ion is the extent to which solid PbSO4 will dissociate or dissolve in water).

We know that Ksp = [Pb2+][SO4^2-], and we are given the value of the Ksp of for PbSO4 as 1.3 × 10⁻⁸. Since the molar ratio between the two ions are the same, we can use an equivalent variable to represent both:

1.3 \times 10^{-8} = s \times s = s^2 \\s = \sqrt{1.3 \times 10^{-8}} = 1.14 \times 10^{-4} \text{ mol/L}.

So, the molar solubility of PbSO4 is 1.1 × 10⁻⁴ mol/L. The answer is given to two significant figures since the Ksp is given to two significant figures.

8 0
3 years ago
An unknown element X has the following isotopes: 58X (68.00%
wlad13 [49]

The average atomic mass in amu of element X is 58.42 amu

The average atomic mass is the sum of the mass number of each of the isotopes multiplied by their respective abundances.

So;

The average atomic mass of element X is;

(58 * 0.68) + (60 * 0.26) + (0.06 * 62)

= 39.44 + 15.26 + 3.72

= 58.42 amu

The  average atomic mass in amu of X is 58.42 amu.

Learn more: brainly.com/question/13292428

5 0
3 years ago
An unknown rectangular substance measures 3.60cm high, 4.21cm long, and 1.17cm wide. If the mass is 21.3g what is this substance
tino4ka555 [31]

The rectangular substance measures 3.60cm high, 4.21cm long, and 1.17cm wide. If the mass is 21.3g  substances density will be 1.20 centimeter cube.

<h3>What is density?</h3>

The density of any substance is the ratio of the mass of substance to the volume of the substance and the unit will be centimeter cube.

The volume of the substance will be 3.60cm high × 4.21cm long ×1.17cm wide = 17.7 milliliters.

                       density = mass of substance / volume of substance

Substituting the value in formula

                        Density = 21.3g /  17.7 milliliters.

                         Density =  1.20 centimeter cube.

Therefore,  rectangular substance measures 3.60cm high, 4.21cm long, and 1.17cm wide. If the mass is 21.3g  substances density will be 1.20 centimeter cube.

Learn more about density, here:

brainly.com/question/15164682

#SPJ1

4 0
2 years ago
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