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3 years ago

Which element has an electron configuration of [Kr]5s2

Chemistry

1 answer:

nydimaria [60]3 years ago

5 0

Element name = <u>strontium</u>

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Which best represents the reaction of calcium and zinc carbonate (ZnCO3) to form calcium carbonate (CaCO3) and zinc? Ca → ZnCO3

artcher [175]

Ca + ZnCO3 → CaCO3 + Zn

3 0

3 years ago

Read 2 more answers

The combustion of ethene in the presence of excess oxygen yields carbon dioxide and water: c2h4 (g) + 3o2 (g) → 2co2 (g) + 2h2o

meriva

Answer:

$\boxed{-267.5}$

Explanation:

You can calculate the entropy change of a reaction by using the standard molar entropies of reactants and products.

The formula is

$\Delta_{r} S^{\circ} = \sum_n {nS_{\text{products}}^{\circ} - \sum_{m} {mS_{\text{reactants}}^{\circ}}}$

The equation for the reaction is

C₂H₄(g) + 3O₂(g) ⟶ 2CO₂(g) + 2H₂O(ℓ)

ΔS°/J·K⁻¹mol⁻¹ 219.5 205.0 213.6 69.9

$\Delta_{r} S^{\circ} = (2\times213.6 + 2\times69.9) - (1\times219.5 + 3\times205.0)\\\\= 567.0 - 834.5 = \boxed{-267.5 \text{ J}\cdot\text{K}^{-1} \text{mol}^{-1}}$

3 0

3 years ago

Help me please i need the answer now<br>(nonsense report)

rusak2 [61]

Answer:

Quantitative

Words, Measurement, Numbers, Charts, Instruments, Quantity, Data

Qualitative

Touch, Quality, Hear, Senses, Description, Exact, Narrative, Analyze

Explanation :

Quantitative Data

Can't measure
Has numerical value
Can campare
Do not depend on human eye

Qualitative Data

Can't measure
Don't have numerical value
Can't campare
Depend on human eye

3 0

3 years ago

The pressure in car tires is often measured in pounds per square inch (lb/in.2), with the recommended pressure being in the rang

Minchanka [31]

Answer:

2.62 atm

Explanation:

1 atm = 14.6959 psi

38.5 / 14.6959 = 2.62 atm

4 0

2 years ago

A certain element has only two naturally occurring isotopes: one with 18 neutrons and the other with 20 neutrons. The element fo

melamori03 [73]

Answer:

[Cl-18]⁻ & [Cl-20]⁻

Explanation:

By definition isotopes are elements with the same number of protons by different number of neutrons. Elements X-18 & X-20 have 17 protons and represent Chlorine isotopes Cl-18 & Cl-20 each with 17 protons and 18 electrons to give the isotopes a -1 oxidation state. Both isotope of chlorine have 7 electron in its valence shell and 10 electrons in its core structure. Gaining 1 electron fills the valence octet and establishes a -1 oxidation state.

7 0

3 years ago