Physical change is a change that occurs in a substance that does not change the identity of the substance. It does not alter the chemical structure of the molecules ehile chemical change involves the breaking of the bonds in the substance forming new substance. To identify a metal physically, we can use properties like their boiling and melting points. We can determine at what temperatures these metals melt or boil then from literature we compare the values. Another properties that can be looked upon to are hardness, color and density. For chemical methods, we can allow it to react with substances, that will produce precipitates containing the metal in question. Also, we can use other methods like titration method. All chemical methods involves the use of chemical reactions.
Answer and explanation:
Active and passive transport of solutes across a membrane differ essentially in the requirement of energy to impulse the process. <u>Passive transport</u> occurs in favor of the solute concentration gradient (from higher solute concentration to lower solute concentration) and it does not require energy supply. Ions and small hydrophobic molecules are commonly transported by passive transport across the plasmatic membrane. By other hand, <u>active transport </u>occur against the solute concentration gradient (from lower solute concentration to higher concentration) so it requires energy, usually supplied by ATP consumption. Membrane channels and pumps are often required in this kind of transport.
Answer:
20000 mg
Explanation:
1 kg = 1000000
so if u multiply 0.020kg by 1000000 u get 20000
D. Dependent on an objects position
CaCl2(s) -> Ca^2+(aq)+Cl(aq)
