Explanation

CaCO₃ → CaO + CO₂ is an endothermic reaction because it absorbs heat to decompose calcium carbonate.

Exothermic reactions (like combustion reactions) release heat to the surroundings.

Explanation

Hepatitis A and E are typically acute, short-term infections that resolve on their own without causing chronic liver disease.

Hepatitis B and C, on the other hand, can lead to chronic infections.

Explanation

To factor the expression:

4a² - 16

First, factor out the greatest common factor (GCF), which is 4:

4(a² - 4)

Then, recognize the difference of squares pattern:

a² - 4 = (a - 2)(a + 2)

So, the factored form is:

4(a - 2)(a + 2)

Explanation

A schema is a mental framework that helps organize and interpret information.

It allows individuals to understand new experiences by relating them to existing knowledge.

Explanation

The older child reinforces their own learning while teaching.

The younger child gains knowledge and guidance from the older one.

Explanation

The Pakistan Boy Scouts Association was established in 1947 after the partition.

It became a member of the World Organization of the Scout Movement in 1948.

Quaid-e-Azam Muhammad Ali Jinnah was the first Chief Scout of Pakistan Boy Scouts Association.

Explanation

The Aqeeqa of the Holy Prophet Muhammad (SAW) was performed by his grandfather Abdul Muttalib on the 7th day after his birth.

This is in accordance with Islamic tradition for newborns.

Explanation

Let's break it down step by step:

1. Expand 2x²(1 + 3x):

2x² + 6x³

2. Expand (1 + 4x² - 2x)(5x - 1):

= 5x - 1 + 20x³ - 4x² - 10x² + 2x

= 20x³ - 14x² + 7x - 1

3. Now subtract:

2x² + 6x³ - (20x³ - 14x² + 7x - 1)

= 2x² + 6x³ - 20x³ + 14x² - 7x + 1

= -14x³ + 16x² - 7x + 1

Explanation

Horseshoe design combines both circle and row formats, creating a semi-circular arrangement ideal for group discussions, assignments, and lectures.

It facilitates interaction while maintaining focus, with participants seated in a shape that promotes engagement.

Explanation

Backward Conditioning occurs when the conditioned stimulus (CS) is presented after the unconditioned stimulus (UCS) or during its presentation.

It is considered less effective in creating strong conditioning compared to other types.