Homework - Y7 W2 - Acid and alkali

Homework - Acid and alkali

Which acid is found in citrus fruits?

1. Sulfuric acid
2. Citric acid
3. Acetic acid
4. Nitric acid

Which acid is commonly used in batteries?

1. Acetic acid
2. Sulfuric acid
3. Citric acid
4. Hydrochloric acid

How do acids for example vinegar taste?

1. Sour
2. Sweet

Where in our digestive system is acid useful?

1. In our tear ducts
2. In our mucus membranes
3. In the small intestine
4. In the stomach

When acids are concentrated they are

1. Irritant
2. Corrosive
3. Strong
4. Weak

When acids are diluted they are

1. Irritant
2. Corrosive
3. Strong
4. Weak

What protection should you wear when dealing with acids in the lab?

1. Lab coat
2. Goggles
3. Gloves
4. Breathing mask

Which of the following is a common alkaline substance?

1. Vinegar
2. Baking soda
3. Lemon juice
4. Salt

Alkali are the chemical opposite of

1. Acids
2. Bases

What are alkalis used for?

1. Cooking products
2. Hairspray
3. Cleaning products
4. Alcohol wound wipes

Acid

Alkali

Toothpaste

Bleach

Baking soda

Vinegar

Are concentration and strength the same when talking about acids and alkalis?

Yes, concentration is the same as strong.

No, if an acid is concentrated it doesn't mean it is strong.

Yes, a strong acid is a concentrated acid.

No, a dilute alkali can still be strong.

What does the concentration of an acid refer to?

1. The amount of acid present in a given volume
2. The taste of the acid
3. The color of the acid
4. The temperature of the acid

How is the strength of an acid determined?

1. By its odor
2. By its color
3. By its density
4. By the extent to which it ionizes in water

What does a higher concentration of acid indicate?

1. A larger volume of acid
2. A lower density of acid
3. Less acidity
4. More acid molecules in a given volume

What effect does a stronger acid have on its concentration?

1. It makes the concentration undefined
2. It does not necessarily change the concentration
3. It always decreases the concentration
4. It always increases the concentration

How does diluting an acid affect its strength?

1. It makes the acid more reactive
2. It increases the strength of the acid
3. It decreases the strength of the acid
4. It has no effect on the strength

Phone batteries could last 50% longer if more 5G towers are built

5G

Increasing the density of 5G masts could slash a mobile network’s overall energy use by two-thirds and greatly extend the battery life of all phones, researchers have found.

Mobile phone signals are broadcast from towers in all directions, so much of the energy is wasted due to absorption, reflection and scattering. Agrim Gupta and his colleagues at the University of California, San Diego, say that cutting the distance of wireless transmissions is key as it would mean each cell…

How much longer could phone batteries last with more 5G towers?

1. 100%
2. 75%
3. 50%
4. 25%

Increasing the density of 5G masts could slash a mobile network’s overall energy use by _______.

1. two-thirds
2. three quarters
3. one fifth
4. three tenths