Question 1

Refer to the second and third images. A mass is suspended from the ceiling by two cables, forming angles with the ceiling. If the mass is 3 kg and the angles are 55° and 30° with respect to the ceiling, which equation correctly represents the equilibrium condition for the vertical components of the forces?

Accepted Answer

$$T_1$$ \sin 55^\circ + $$T_2$$ \sin 30^\circ = F_g$$

Question 2

The fourth image shows a triangle with sides $$a$$, $$b$$, $$c$$ and angles $$A$$, $$B$$, $$C. $$Which law is most appropriate to use when solving for an unknown side in a non-right triangle when two angles and one side are known?

Accepted Answer

The Sine Rule: $$\frac{a}{\sin A} = \frac{b}{\sin B} = \frac{c}{\sin C}$$

Question 3

The fifth and sixth images show a parallelogram. In vector addition, what does the diagonal of the parallelogram represent?

Accepted Answer

The resultant vector of the two concurrent vectors

Question 4

The seventh image shows a molecule with a central atom and four surrounding atoms. What is the molecular geometry of this molecule according to VSEPR theory?

Accepted Answer

Tetrahedral

Question 5

The eighth image shows a metallic structure. What type of bonding is represented here?

Accepted Answer

Metallic bonding

Question 6

The ninth image shows a ball-and-stick model of ethane. What is the empirical formula of ethane?

Accepted Answer

$$CH_3$$

Question 7

The tenth image shows the Lewis structure of ethane. What is the total number of valence electrons in the ethane molecule ($$C_2H_6$$)?

Accepted Answer

14

Question 8

The eleventh image shows three containers with different arrangements of particles. Which container represents a gas at the highest temperature?

Accepted Answer

The container with the most widely spaced and fastest moving particles

Question 9

The twelfth image shows a laboratory flask. Which of the following best describes the use of this flask in a titration experiment?

Accepted Answer

It is used to contain the solution of unknown concentration to which the titrant is added.

Question 10

In the context of the images and the study material, which of the following best describes the difference between empirical and molecular formulas?

Accepted Answer

The empirical formula shows the simplest whole-number ratio of atoms, while the molecular formula shows the actual number of each atom in a molecule.

Grade 11 Physics and Chemistry Essentials: Structured Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard