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4 years ago

Why is strontium important?

Chemistry

1 answer:

Dmitrij [34]4 years ago

6 0

Its used for producing ferrite magnets and refining zinc. its salt causes vivid color crimson flames to produce flares

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A neutral atom has an atomic mass of 7 and atomic number of 3. Which of the following state is true? *

Rasek [7]

A. The atom has 3 protons, 3 electrons, and 4 neutrons.

6 0

3 years ago

At least three types of RNA are required for protein synthesis. Compare and contrast mRNA, rRNA, and tRNA by moving the descript

Vedmedyk [2.9K]

Explanation:

The difference among mRNA, tRNA and rRNA are:

mRNA: It carries DNA's protein building information from nucleus to the cytoplasm. It is also read as codons nucleotide triplet that indicate specific amino acids .

rRNA: The function of rRNA is to join amino acids to the peptide bonds.

tRNA: Delivers amino acids to the site of protein synthesis. It also has an anticodon that interact with specific codon of another nucleus.

The similarity among mRNA, rRNA and tRNA is that they all consists of ribonucleic acid and can exist outside the nucleus in eukaryotes.

7 0

4 years ago

4. A piece of metal weighing 0.0713 g was placed in a eudiometer containing dilute aqueous HCl. After the metal fully dissolved,

Anastasy [175]

Complete Question

4. A piece of metal weighing 0.0713 g was placed in a eudiometer containing dilute aqueous HCl. After the metal fully dissolved, 23.5 mL of hydrogen gas was collected by displace-ment of water and a 400 mm column of water was observed. The water temperature was 258C and the barometric pressure was 758.8 mm Hg (torr). Refer to the Introduction and data sheet to solve the following problems.

a) What is the vapor pressure of the water vapor in the column? (Consult Appendix E.)

b) What is the pressure of the water column expressed in mm Hg (torr)? The density of mercury is 13.6 g/mL.

c) Calculate the pressure of the hydrogen gas above the water in the column.

d) Calculate the volume occupied by the hydrogen gas at STP.

Answer:

a) $25\textdegree C=23.8 torrs$

b) $P_w=758.8$

c) $P_w=758.8=735torr$

d) $V_2=20.82mL$

Explanation:

From the question we are told that:

Metal weight $M_m=0.0713g$

Volume Hydrogen $V_h=23.5mL$

Displace-ment Column of water 400 mm column of water

Temperature $T =258\textdegree C$

Barometric Pressure $p=758.8mmHg$

Vapour Pressure of water at $25^oC$

Generally from (Consult Appendix E.)

Va-pour Pressure of water at

$25\textdegree C=23.8 torrs$

Pressure of Water column

$P_w=758.8$

c) Pressure of Water column (Consult Appendix E.)

$P_w=758.8=735torr$

Generally the equation for ideal gas is mathematically given by

$\frac{p_1v_1}{T_1}=\frac{p_2v_2}{T_2}$

Therefore

$V_2=\frac{p_1V_1T_2}{T_1p_2}$

$V_2=\frac{735*23.5*273}{298*760}$

$V_2=20.82mL$

5 0

3 years ago

Elements are organized on the periodic table based on their properties. Which statement correctly predicts and explains the chem

Elanso [62]

Answer is: a. Rubidium (Rb) is more reactive than strontium (Sr) because strontium atoms must lose more electrons.

The ionization energy (Ei) is the minimum amount of energy required to remove the valence electron, when element lose electrons, oxidation number of element grows (oxidation process).

Alkaline metals (group 1), in this example rubidium, have lowest ionizations energy and easy remove valence electrons (one electron), they are most reactive metals.

Earth alkaline metals (group 2), in this example strontium, have higher ionization energy than alkaline metals, because they have two valence electrons, they are less reactive.

Rubidium electron configuration: ₃₇Rb 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶5s¹; one valence electron is 5s¹ orbital.

Strontium electron configuration: ₃₈Sr 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶5s²; two valence electrons is 5s² orbital.

7 0

3 years ago

Read 2 more answers

Using the following equation for the combustion of octane calculate the heat associated with the formation of 100.0 g of carbon

natali 33 [55]

Answer:

The right solution is "-602.69 KJ heat".

Explanation:

According to the question,

The 100.0 g of carbon dioxide: