Answer:
The bond angle in H2O is about (104.5∘). In H2O,O-atom has two lone pairs.
Explanation:
The VSEPR theory describes five main shapes of simple molecules: linear, trigonal planar, tetrahedral, trigonal bipyramidal, and octahedral.
First one is a
the
second one is b
The correct answer choice which best describes why a liquid needs a container when a solid does not is simply because:
Solids have definite shapes, and liquids fill their containers.
Matter is classified as element, compounds and mixtures
<h3>What is an element?</h3>
An element is a substance which cannot be split into simpler forms by an ordinary chemical process. This simply goes to say that elements are substances which cannot be decomposed into simpler substances by ordinary chemical reactions.
An atom is the smallest unit or part of an element which can take part in a chemical reaction.
On a general note, elements are classified as thus:
- Metals, non-metal, and metalloid.
- The extreme left side elements in the periodic table are metals, for example, aluminum, sodium, calcium, caesium, etc.
- However, elements on the right side are generally referred to as non-metals, carbon, chlorine, oxygen,
So therefore, the correct answer choice which best describes why a liquid needs a container when a solid does not is simply because:
Solids have definite shapes, and liquids fill their containers.
Learn more about atoms and elements:
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It has 4 pcs of Carbon (C) and 8 pcs of Hydrogen (H) so the formula is C4H8 - calls Butene.
Hope it helps!
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Answer:
Molar mass of menthol is 155.86 g/mol
Explanation:
Let's apply the colligative property of freezing point depression:
ΔT = Kf . m . i
As menthol is an organic compound we assume the i (Van't Hoff factor as non electrolytic, so i = 1)
m = mol /kg (molality)
Kf = Cryoscopic constant, in this case, for cyclohexane
ΔT = T° freezing of pure solvent - T° freezing solution
7.90°C = 20.8°C / m . m . 1
7.90°C / 20.8 m/°C = m
0.380 m = molality
0.380 moles are the moles of solute (menthol) dissolved in 1kg of solvent, but our mass of solvent is 25 g.
Let's convert the g of solvent to kg to work with molality
25 g = 0.025 kg
molal . solvent mass = moles of solute
0.380 mol /kg . 0.025kg = 9.49×10⁻³ moles
Now, we have the moles and the mass of solute. Let's determine the molar mass of menthol (grams / moles)
1.48 g / 9.49×10⁻³ m = 155.86 g/m
