Homework Indicators and pH

• Science
• Lower Secondary (Key Stage 3)

Homework Indicators and pH

What is the purpose of using litmus as an indicator?

1. To change the color of the solution
2. To determine the chemical composition of the substance
3. To measure the strength of acid or alkali
4. To show if a solution is acid or alkali

How does blue litmus paper act in an acidic solution?

1. It turns purple
2. It remains unchanged
3. It turns red
4. It turns blue

What does the universal indicator show about acids and alkalis?

1. The range of colors indicates their strength
2. Whether they are liquid or solid
3. Their chemical formula
4. Their physical state at different temperatures

In what form can universal indicator be found?

1. Paper or solution
2. Only in solution
3. Only in solid form
4. Only in powder

What can be used to create an indicator besides litmus and universal indicator?

1. Carrots
2. Spinach
3. Blueberries
4. Red cabbage

What does the pH scale measure?

1. Molecular weight of a substance
2. Color of a substance
3. Acidity or alkalinity of a substance
4. Temperature of a substance

What is the pH of a neutral substance?

1. 5
2. 12
3. 10
4. 7

Which substance has a pH lower than 7?

1. Pure water
2. Milk
3. Baking soda solution
4. Lemon juice

What does a pH of 14 indicate?

1. Slightly acidic substance
2. Strongly alkaline substance
3. Weakly alkaline substance
4. Neutral substance

What happens to the pH when a substance becomes more acidic?

1. pH stays the same
2. pH increases
3. pH fluctuates
4. pH decreases

Acid or Alkali?

Acid

Alkali

Stomach acid

Sodium hydroxide

Taste sour

pH < 7

pH > 7

Bleach

Vinegar

Acid

Neutral

Alkali

Taste sour

Soap

Water

pH 7

pH less than 7

pH more than 7

Lemon juice

Vinegar

Bleach

Perming.

Perming lotion is applied to make hair permanently curly. 

The lotion can be acidic or alkaline. After use a neutraliser is added to move the pH to 7.

Acid

Alkaline

Neutral

Hair's pH

Acid perming lotion

Alkaline perming lotion

Elon Musk's Starship goes 'farther than ever'

US company SpaceX's Starship rocket made major progress in its third test flight on Thursday, completing many of its objectives.

The two-stage vehicle produced a clean getaway from its Texas launch site, to send its upper portion around the globe to a re-entry over the Indian Ocean.

Which area did SpaceX's Starship rocket send its upper portion around?

1. The moon
2. The sun
3. Mars
4. The globe

How many stages does SpaceX's Starship rocket have?

1. One
2. Three
3. Two
4. Four

Where did the upper portion of SpaceX's Starship rocket re-enter the atmosphere?

1. Arctic Ocean
2. Indian Ocean
3. Atlantic Ocean
4. Pacific Ocean

What major progress did SpaceX's Starship rocket make in its third test flight?

1. Failing to launch
2. Completing many objectives
3. Experiencing engine failure
4. Losing communication with ground control

Where did SpaceX's Starship rocket complete its third test flight?

1. California
2. Florida
3. New Mexico
4. Texas

Elon Musk's Starship goes 'farther than ever'

Radio contact was lost towards the end but the firm said it was "incredible to see how far we got this time around".

SpaceX boss Elon Musk was delighted with the outcome of the flight, too.

He posted on X, formerly Twitter, that "Starship will take humanity to Mars".

Who will Starship take to Mars according to Elon Musk?

1. SpaceX employees
2. Astronauts
3. Humanity
4. Aliens

What was the reaction of the firm towards the end of the flight?

1. It was disappointing
2. It was expected
3. It was a failure
4. It was incredible to see how far we got this time around

What was said about the radio contact towards the end?

1. It was lost
2. It was maintained
3. It was improved
4. It was strengthened

What did SpaceX boss Elon Musk post on X?

1. I love space exploration
2. We will reach the moon
3. Starship will take humanity to Mars
4. Let's explore the stars

Who was delighted with the outcome of the flight?

1. NASA
2. Elon Musk
3. Jeff Bezos
4. Richard Branson

Elon Musk's Starship goes 'farther than ever'

Separation of the bottom half, the booster, from the top half, the Ship, occurred right on cue, two minutes and 44 seconds into the flight.

The ship then powered on, crossing the Atlantic and southern Africa.

Video cameras sent back spectacular views of Earth from more than 100 miles up.

At what point did the separation of the booster from the Ship occur?

1. Four minutes into the flight
2. Two minutes and 44 seconds into the flight
3. Three minutes into the flight
4. One minute and 30 seconds into the flight

Where did the ship travel after the separation?

1. Across the Atlantic and southern Africa
2. Across the Arctic and Antarctica
3. Across the Indian Ocean and Australia
4. Across the Pacific and northern Europe

How high above Earth did the video cameras capture the views?

1. 150 miles
2. More than 100 miles
3. 75 miles
4. 50 miles