IGCSE, Edexcel, IB and AP Science Courses | Dr Dabour Hub Academy

1.

The slope of the tangent line to the curve y = x² - 6 x + 5 at the point (4, -3) equals:

m = -2

m = 2

m = -3

m = 8

2.

If a particle moves along a straight line such that its position s(t) = t³ - 6 t² + 9 t meters, the particle comes to an instantaneous rest (velocity v(t) = 0) at times:

t = 1 second and t = 3 seconds

t = 2 seconds and t = 4 seconds

t = 0 seconds only

t = 6 seconds

3.

In the expansion of $(x + a)^8$, the middle term is:

D) $T_6$

A) $T_4$

B) $T_5$

C) $T_4$ and $T_5$

4.

The integral $\int \frac{2x}{x^2 + 1}\, dx$ evaluates to:

B) $frac{1}{x^2 + 1} + C$

A) $ln(x^2 + 1) + C$

D) $(x^2 + 1)^2 + C$

C) $2arctan x + C$

5.

STEM Organic Distinction Problem 5: How can you chemically distinguish between phenol (C6H5OH) and ethanol (C2H5OH) using a simple qualitative test?

Adding neutral FeCl3 solution: phenol produces a distinct violet color, whereas ethanol shows no change

Heating with concentrated sulfuric acid at 180°C

Adding litmus paper: ethanol turns blue litmus red

Adding sodium metal: only ethanol reacts with sodium

6.

STEM Organic Distinction Problem 6: How can you chemically distinguish between phenol (C6H5OH) and ethanol (C2H5OH) using a simple qualitative test?

Heating with concentrated sulfuric acid at 180°C

Adding neutral FeCl3 solution: phenol produces a distinct violet color, whereas ethanol shows no change

Adding sodium metal: only ethanol reacts with sodium

Adding litmus paper: ethanol turns blue litmus red

7.

STEM Organic Distinction Problem 15: How can you chemically distinguish between phenol (C6H5OH) and ethanol (C2H5OH) using a simple qualitative test?

Adding neutral FeCl3 solution: phenol produces a distinct violet color, whereas ethanol shows no change

Adding sodium metal: only ethanol reacts with sodium

Adding litmus paper: ethanol turns blue litmus red

Heating with concentrated sulfuric acid at 180°C

8.

STEM Organic Distinction Problem 16: How can you chemically distinguish between phenol (C6H5OH) and ethanol (C2H5OH) using a simple qualitative test?

Adding sodium metal: only ethanol reacts with sodium

Adding litmus paper: ethanol turns blue litmus red

Heating with concentrated sulfuric acid at 180°C

Adding neutral FeCl3 solution: phenol produces a distinct violet color, whereas ethanol shows no change

9.

STEM Organic Distinction Problem 25: How can you chemically distinguish between phenol (C6H5OH) and ethanol (C2H5OH) using a simple qualitative test?

Adding sodium metal: only ethanol reacts with sodium

Heating with concentrated sulfuric acid at 180°C

Adding neutral FeCl3 solution: phenol produces a distinct violet color, whereas ethanol shows no change

Adding litmus paper: ethanol turns blue litmus red

10.

STEM Organic Distinction Problem 26: How can you chemically distinguish between phenol (C6H5OH) and ethanol (C2H5OH) using a simple qualitative test?

Adding neutral FeCl3 solution: phenol produces a distinct violet color, whereas ethanol shows no change

Heating with concentrated sulfuric acid at 180°C

Adding litmus paper: ethanol turns blue litmus red

Adding sodium metal: only ethanol reacts with sodium

11.

STEM Organic Distinction Problem 35: How can you chemically distinguish between phenol (C6H5OH) and ethanol (C2H5OH) using a simple qualitative test?

Adding neutral FeCl3 solution: phenol produces a distinct violet color, whereas ethanol shows no change

Heating with concentrated sulfuric acid at 180°C

Adding litmus paper: ethanol turns blue litmus red

Adding sodium metal: only ethanol reacts with sodium

12.

STEM Organic Distinction Problem 36: How can you chemically distinguish between phenol (C6H5OH) and ethanol (C2H5OH) using a simple qualitative test?

Heating with concentrated sulfuric acid at 180°C

Adding neutral FeCl3 solution: phenol produces a distinct violet color, whereas ethanol shows no change

Adding sodium metal: only ethanol reacts with sodium

Adding litmus paper: ethanol turns blue litmus red

Curriculum

Mathematics

Unit 1

Unit 2

Unit 3

Unit 4

Unit 5

Unit 6

Unit 7

Lesson 1 Quiz: Equilibrium of a Particle, Friction and Limiting Static Friction

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