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riadik2000 [5.3K]

4 years ago

9

Your friend makes the statement that, “Water boils at a higher temperature than ethanol.” To which step of the scientific method

does this statement belong?
A. Experiment
B. Observation
C. Theory
D. Scientific Law

1 answer:

deff fn [24]4 years ago

7 0

Explanation:

Experiment because water boils at 100°c and ethanol 80°co

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Where is Earth's heat energy most concentrated?

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Answer:

The core. Hope this helps and mark me brainliest <3

Explanation:

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When calcium reacts with tellurium to form an ionic compound, each metal atom loses electron(s) and each nonmetal atom gains ele

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Answer:

When calcium reacts with tellurium it will donates its two electrons and these two electron will be accepted by tellurium.

There must be 1 calcium atom for every 1 tellurium atom in the reaction.

Explanation:

Calcium has atomic number of 20. Its electronic configuration is given as:

$[Ca]=1s^2 2s^2 2p^6 3s^2 3p^6 4s^2$

Calcium atom will loose 2 elections to attain electronic configuration of noble gas.

$[Ca^{2+}]=1s^2 2s^2 2p^6 3s^2 3p^6 4s^0$

$Ca\rightarrow Ca^{2+}+2e^-$

Tellurium has atomic number of 52. Its electronic configuration is given as:

$[Te]=1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4s^24p^6 4d^{10} 5s2 5p4$

Tellurium atom will gain 2 elections to attain electronic configuration of noble gas.

$[Te^{2-}]=1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4s^24p^6 4d^{10} 5s2 5p6$

$Te+2e^-\rightarrow Te^{2-}$

So, when calcium reacts with tellurium it will donates its two electrons and these two electron will be accepted by tellurium.

$Ca^{2+}+Te^{2-}\rightarrow CaTe$

There must be 1 calcium atom for every 1 tellurium atom in the reaction.

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47. Describe the shapes and relative energies of the s, p, d, and f atomic orbitals.

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S orbital:spherical

P orbital:dumbbell

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F orbital:complex

Explanation:

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Convert from 1.56×1030 particles of sodium chloride (NaCl) to grams of sodium chloride.

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Answer:

15.14×10⁷ g

Explanation:

Given data:

Number of particles of NaCl = 1.56×10³⁰ particles

Mass of sodium chloride = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ particles

1.56×10³⁰ particles × 1 mol / 6.022 × 10²³ particles

0.259 ×10⁷ mol

Mass in gram:

Mass = number of moles × molar mass

Mass = 0.259 ×10⁷ mol × 58.44 g/mol

Mass = 15.14×10⁷ g

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