Answer:
Water for;
(a) NaCl
(b) HF
(c) (NH₄)₂SO₄
Hexane for;
(a) Octane
Explanation:
In chemistry there is a Rue of Thumb, "<em><u>Like Dissolves Like</u></em>" according to which polar compounds will dissolve in polar solvents and non-polar compounds will dissolve in non-polar solvents.
In given statement two solvents are given.
(1) Water: Water is a polar compound. It has a polar bond and a bent shape, hence has a net dipole moment.
(2) Hexane: Hexane is nonpolar because the electronegativity difference between the carbon atom and hydrogen atom is very less i.e. 0.4.
Therefore, polar solutes like NaCl (ionic), HF (highly polar) and (NH₄)₂SO₄ (ionic compound) will dissolve in water and Octane (C₈H₁₈ nonpolar) will dissolve in hexane respectively.
Answer:


Explanation:
Aluminium hydroxide (
) is a base and hydrobromic acid (HBr) is a strong acid.
Hence an acid-base reaction occurs between
and HBr
Balanced molecular equation:

Balanced total ionic equation:

Balanced net ionic equation:

(net ionic equation is written by removing common ions present in both side of total ionic equation)
The changes in matter/energy can be classified as follows:
- Physical changes - Crystallizing salt from seawater
- Chemical changes - ripening fruit
- Nuclear changes - production of elements in the stars
<h3>What are physical, chemical and nuclear changes?</h3>
Matter and energy undergo physical, chemical and nuclear changes.
Physical changes are changes in which no new product is formed.
Chemical changes are changes in which no new product is formed.
Nuclear changes are changes in which no new product is formed.
Examples of each of the given changes is as follows:
- Physical changes - Crystallizing salt from seawater
- Chemical changes - ripening fruit
- Nuclear changes - production of elements in the stars
Therefore, matter/energy undergo changes.
Learn more about changes in matter at: brainly.com/question/3998772
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The letter only has reflection symmetry, if you rotated it it would look the same.
Answer:
4.14 x 10²⁴ molecules CO₂
Explanation:
2 C₄H₁₀ + 13 O₂ --> 8 CO₂ + 10 H₂O
To find the number of CO₂ molecules, you need to start with 100 grams of butane (C₄H₁₀), convert to moles (using the molar mass), convert to moles of CO₂ (using coefficients from equation), then convert to molecules (using Avagadro's number). The molar mass of C₄H₁₀ is calculated using the quantity of each element (subscript) multiplied by the number on the periodic table. The ratios should be arranged in a way that allows for units to be cancelled.
4(12.011g/mol) + 10(1.008 g/mol) = 58.124 g/mol C₄H₁₀
100 grams C₄H₁₀ 1 mol C₄H₁₀ 8 mol CO₂
-------------------------- x ---------------------- x ---------------------
58.124 g 2 mol C₄H₁₀
6.022 x 10²³ molecules
x ------------------------------------ = 4.14 x 10²⁴ molecules CO₂
1 mol CO₂