Answer:The Ordovician and Cambrian Periods are referred to as the "age of invertebrates", with trilobites abundant. In this period, brachiopods became more abundant that the trilobites, but all but one species of them are extinct today.
Explanation:
Answer:
clastic, organic, and chemical
The number of moles of each product that are formed if 2 moles of Fe2O3 react with 9 moles of CO is 4 moles of Fe and 6 moles of CO2
Explanation
write a balanced chemical reaction
that is FeO3 + 3 CO → 2 Fe + 3CO2
2 moles of Fe2O3 reacted with 3 x2=6 moles of Co to form Fe and CO2 therefore CO was in excess and Fe2O3 was limiting reagent.
use the mole ratio to determine the moles of each product.
that is <em>the mole ratio 0f Fe2O3 : Fe is 1:2 therefore the moles of Fe = </em>2x2=4 moles
<em>the mole ratio of Fe2CO3 : CO2 is 1: 3 therefore the moles of Co2 =</em><em> 2 x3= 6 moles</em>
Answer:
cutting, bending, dissolving, freezing, and boiling
Explanation:
A physical change is a change in one or more physical properties of matter without any change in chemical properties. In other words, matter doesn't change into a different substance in a physical change. Examples of physical change include but are not limited to, from solid to liquid or from liquid to gas are also physical changes.