CE Daily Challenge #09

Which ORGANELLE carries out respiration?

• mitochondria

• chloroplasts

• ribosomes

• golgi apparatus

Answer explanation

mitochondria = respiration

chlorplasts = photosynthesis

Which of these substances / chemicals are EXCRETED?

• carbon dioxide

• water

• feces

• bile

Answer explanation

the body makes waste CO₂ and H₂O - EXCRETED

feces is EGESTED - it is mostly undigested plant cellulose cell wals

What GAS TEST would you use to correctly identify the gas produced when POTASSIUM PREMANGANTE thermally decomposes?

• in lime water: goes from clear to cloudy

• in a flame: makes a squeaky pop

• use a glowing splint: relights

• add to anhydrous copper sulfate: goes from white to blue

Answer explanation

Potassium premanganATE (los of oxygen) - relases oxygen which relights a glowing splint

What method would you use to collect WATER from SALT WATER?

• distillation

• filtration

• evaporation

• sieving

If a car is travelling at a steady 70mph, what can you say about the forwards force of the engine compared to drag and friction?

• forces are balanced

• the forwards forces are bigger

• you cannot say

• the forwards force is vey big

What does the law for the Conservation of energy mean…

 

Select 3 answers

• energy cannot be lost

• energy cannot be created

• energy is transferred into other forms

• energy is lost forever

• the energy will run out

The Queen’s carriage marching speed is 1.2m/s. How far would it go in 10 minutes?

Answer explanation

t = 10 minutes = 600 seconds

SiDoT = D = SxT = 1.2x600 = 720m

The Jubilee horse parade was timed by 5 people to get an estimate of the horses’ speed. Why did 5 people time the parade?

• to make it more accurate

• to reduce human error

• in case one stop watch is wrong or faulty

• to calculate an average because that is the right thing to do

Answer explanation

every person would time slightly differently. More readings and taking an average would reduce HUMAN ERROR!