<span>If thermal energy (heat) must be added to a chemical reaction in order for the reaction to take place, the reaction is endothermic. </span>
D, because a medium is a state of matter (solid, liquid, or gas)
Answer:
1460 red Lego bricks will be sufficient for 10 kg child to consume to reach the LD-50 threshold.
Explanation:
Average mass of a Lego brick = 2.50 grams
Amount of cadmium in 1 gram of red lego brick = 274 μg =
1 μg =
Amount of cadmium in 2.50 grams of lego brick :
LD-50 for cadmium = 100 mg/kg
For a 10.0 kg child the amount of cadmium that will be lethal :
1 g = 1000 mg
Let the number of red Lego bricks ingested by the child to reach the LD-50 threshold be x.
x × (Amount of Cd in single 2.50 g red lego brick) = 1g
1460 red Lego bricks will be sufficient for 10 kg child to consume to reach the LD-50 threshold.
Answer:
A lead apron is a <u>non-critical </u> instrument.
Hope it helps!