Question

PLEASE HELP!! ILL GIVE YOU 30 POINTS!! ANSWER QUICK PLEASE!!!

1) which of the following pairs of substances would best be separated using a centrifuge, and why?
A) Cream and milk, because of their difference in density
B) Cream and milk, because of the difference in boiling point
C) Salt and water, because of their difference in magnetism
D) Salt and water, because of the difference in solubility
2) sterling silver is an alloy of silver made up of around 93% silver and 7% other metals, such as copper, all blended together to form the substance. What type of mixture is sterling silver?
A) A heterogenous mixture, because the different components are mixed evenly with in this substance
B) A heterogeneous mixture, because the different components are mixed on unevenly with in this substance
C) A homogeneous mixture, because the different components are mixed and evenly within the substance
D) A homogeneous mixture, Because the different components are mixed and unevenly within the substance
3) which of the following correctly describes compound?
A) The atoms are chemically bonded together and they retain their individual physical and chemical properties
B) The Atoms are not chemically bonded, and there is no set ratio for how the atoms can combine together
C) The atoms can only combine in fixed ratios, and they can only be separated by a chemical change
D) The atoms do not retain their individual chemical properties, and they can be seperated by physical means

Answer 1

3) a) The atoms are bonded together, and the compound has different physical and chemical properties than the individual elements.

Answer 2

1) centrifuge is used to separate mixtures which are heterogeneous in nature.

So here in the given examples

A) Cream and milk, because of their difference in density

2) sterling silver is a homogenous mixture alloy.

So answer is A homogeneous mixture, because the different components are mixed and evenly within the substance

3) Compound is when atoms combine by chemical reaction and they lose their identity