If a liquid does not have a constant boiling point but it looks the same throughout, then the liquid is probably a homogeneous mixture. A liquid that does not have a constant boiling point would mean that it is not a pure liquid, it would be a mixture of different substances. As stated, the liquid is observed to be the same all throughout then it most likely is homogeneous. Homogeneous mixture are mixture which has the same composition of the components at any point of the mixture. So, it would have uniform properties as well. Examples of this type of mixture would be soda, coffee, tea and juices.<span />
Answer:
Valence electron pairs are the total sum of lone pairs and bond pairs in the molecule. The electrons possess negative charge on them. They repel each other due to the presence of same charge. The lone pairs repel other electrons strongly, which are present around the central atom.
O2 isn't necessary for rusting, but some source of oxygen is required. Rust is just another name for iron oxide, and without oxygen there can't be oxide.
Hope this helps,
Davinia.
Answer is: density of the talc sample in air is 4,61 g/cm³.
m(talc) = 13,65 g.
d(talc) = 1,75 g/cm³.
V(talc) = m(talc) ÷ d(talc).
V(talc) = 13,65 g ÷ 1,75 g/cm³.
V(talc) = 7,8 cm³.
d(talc in air) = m(talc in air) ÷ V(talc).
d(talc in air) = 35,97 g ÷ 7,8 cm³.
d(talc in air) = 4,61 g/cm³.
A.) Collagen is a structural protein and hemoglobin is a protein involved in the transport of oxygen. Good Luck