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A 95% confidence level means that Multiple choice question. 95% of all X values will fall within the interval. we are 95% confident that we know the population mean. for repeated samples of size n, 5% of the confidence intervals will contain the population mean. for repeated samples of size n, 95% of the confidence intervals will contain the population mean.

20 Multiple Choice 1 point Which hybridization corresponds to a linear molecular shape?

21 Multiple Choice 1 point Question: In a calorimetry experiment, what role does heat capacity play in the calculations? It measures the change in the volume of the solution. It relates the heat absorbed to the temperature change. It relates the heat absorbed to the change in mass. It measures the change in chemical bonds.

19 Multiple Choice 1 point Molecular Geometry Question: Why does

have a trigonal pyramidal shape instead of trigonal planar? The lone pair occupies less space than a bonded atom. Nitrogen's small size prevents tetrahedral geometry. Hydrogen atoms repel each other more than lone pairs. The lone pair compresses bond angles below

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What is the expected number of times the family will cook at home each week?

18 Multiple Choice 1 point Molecular Geometry Question: When there are five regions of electron density around the central atom, what shape results and why? Tetrahedral, because five groups force a 3D pyramid. Octahedral, because electrons prefer

angles. Trigonal bipyramidal, because three groups spread out in a plane while two go above and below. Square pyramidal, because gne region always gets pushed down.

The equation for a confidence interval for μ when the population standard deviation is known is Multiple choice question. x± zα σn μ ±zα/2 σn x± zα/2σ2n x± zα/2 σn

17 Multiple Choice 1 point Molecular Geometry Question: What is the primary reason that a molecule like water

is bent instead of linear? The lone pairs on oxygen repel the bonded hydrogen atoms into a bent shape. Water's bonds have different lengths. The hydrogen atoms are too large to fit on opposite sides. The oxygen atom prefers a triangular arrangement.

14 Multiple Choice 1 point Question: Which structure correctly explains the resonance in the carbonate ion

? The double bond between carbon and oxygen can shift among the three oxygen atoms, creating three resonance structures with equal bond lengths. One carbon atom forms three single bonds with oxygen atoms, with all atoms carrying formal charges. Carbon rotates among the oxygens, breaking and forming new bonds as the molecule changes shape. Two oxygen atoms form double bonds, and one remains single bonded with two lone pairs.

13 Multiple Choice 1 point Question: Why does phosphorus pentachloride

violate the octet rule? Phosphorus can expand its octet by using d-orbitals, allowing five bonds instead of just four. Chlorine cannot share more than one electron, forcing phosphorus to break the rule. The molecule uses ionic bonding instead of covalent, removing the need for the octet. It forms resonance structures that prevent it from following the octet rule.

Calculate R using Kirchhoff's laws. Again, start by an assumed current I starting from the battery, and make your way through the circuit. Math will eventually give you the correct directions of the currents and in turn, R.unbalanced bridge circuit