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4 years ago

Which type of star has the lowest density?

Chemistry

2 answers:

julsineya [31]4 years ago

8 0

The white dwarf has the lowest density of the stars listed. Hope this helps and have a nice day!

Otrada [13]4 years ago

3 0

Answer:

A. giant

Explanation:

Giant stars are older and hotter than dwarf stars. They can be thousands of times brighter than our Sun. They have low density (although they are large) as opposed to the white dwarf which is one of the celestial bodies with the highest density.

Among the giant stars we can mention the red giants and the blue giants.

The end of the lives of these stars is marked by explosive cosmic events, such as supernovae, which can give rise to black holes.

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What are all the possible masses of cl2 molecules that are made when two chlorine atoms bond together?

Pavel [41]

The masses of the 2 most common isotopes of Cl are 35 and 37. Therefore we can formulate 3 possible masses of Cl2:

35 + 35 = 70
35 + 37 = 72
37 + 37 = 74

However, Cl 35 is the most common isotope of chlorine of the two therefore it is the most probable that two Cl 35 atoms will combine, so 70 is the most common among all.

6 0

3 years ago

Read 2 more answers

Select the true statements regarding these resonance structures of formate.? Each carbon-oyxgen bond is somewhere between a sing

son4ous [18]

Answer : Option 1) The true statement is each carbon-oxygen bond is somewhere between a single and double bond and the actual structure of format is an average of the two resonance forms.

Explanation : The actual structure of formate is found to be a resonance hybrid of the two resonating forms. The actual structure for formate do not switches back and forth between two resonance forms.

The O atom in the formate molecule with one bond and three lone pairs, in the resonance form left with reference to the attached image, gets changed into O atom with two bonds and two lone pairs.

Again, the O atom with two bonds and two lone pairs on the resonance form left, changed into O atom with one bond and three lone pairs. It concludes that each carbon-oxygen bond is neither a single bond nor a double bond; each carbon-oxygen bond is somewhere between a single and double bond.

Also, it is seen that each oxygen atom does not have neither a double bond nor a single bond 50% of the time.

7 0

3 years ago

Read 2 more answers

If 30.0 grams of sulfuric acid react with 26.0 grams of aluminum hydroxide in a double replacement reaction, how many grams of w

FromTheMoon [43]

Answer:

a) mass of water produced= 11.16 g of water

b) mass of excess reactant= 9.36 g of aluminum hydroxide

Explanation:

The balanced reaction equation is;

3H2SO4 + 2Al(OH)3 → 6H2O + Al2(SO4)3

The next step is to determine the limiting reactant. The limiting reactant will give the least number of moles of product.

For sulphuric acid;

Molar mass of sulphuric acid =98gmol-1

Number of moles of sulphuric acid= 30g/98gmol-1 = 0.31 moles of sulphuric acid

From the reaction equation;

3 moles of sulphuric acid yields 6 moles of water

0.31 moles of sulphuric acid will yield 0.31 ×6/3 = 0.62 moles of water

For aluminum hydroxide;

Number of moles= 26.0 g/78 g/mol = 0.33 moles

From the reaction equation;

2 moles of aluminum hydroxide yields 6 moles of water

0.33 moles of aluminum hydroxide will yield 0.33 × 6/2 = 0.99 moles of water

Hence sulphuric acid is the limiting reactant.

Thus mass of water produced= 0.62 moles ×18gmol-1 = 11.16 g of water

Since 3 moles of sulphuric acid reacts with 2 moles of aluminum hydroxide

0.31 moles of sulphuric acid reacts with 0.31 ×2/3 = 0.21 moles of aluminum hydroxide

Thus amount of excess reactant = 0.33- 0.21 = 0.12 moles of aluminum hydroxide

Mass of excess aluminum hydroxide = 0.12 × 78 g/mol = 9.36 g of aluminum hydroxide

4 0

3 years ago

Chlorine- What is the mass number of this element? How many neutrons?

Alexxandr [17]

Answer:

Chlorine is a chemical element with atomic number 17 which means there are 17 protons and 17 electrons in the atomic structure. The chemical symbol for Chlorine is Cl. Neutron Number and Mass Number of Chlorine Mass numbers of typical isotopes of Chlorine are 35; 37.

Explanation:

5 0

3 years ago

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When sodium carbonate (Na2CO3) dissolves in water, it partially ionizes. The carbonate (CO3-) ion takes up a hydrogen ion and fo

NeX [460]

Sodium Carbonate is a strong base! Hope this helps!

4 0

4 years ago