True or false and other stuff (below)?

Question

1) The substances that take part in a chemical reaction keep their properties.

2) The new substances made in chemical reaction have new properties.

3) The electrolysis of water is an example of a chemical change.

4) A chemical change makes new products.

5) A physical change makes new products.

Chemical change or physical change demolishing a car and the rustion of iron.

When ice changes to water the link-up of the atoms changes or not ?

When water changes to ice the link-up of the atoms changes or not ?

Answer 1

You won't learn if someone else does the work for you.

Answer 2

1) Consider pure sodium (Na) and table salt (NaCl). Pure sodium explodes when you put it in water, but NaCl just dissolves and, some say, improves taste.

2) See #3 -- does water have different chemical properties compared to oxygen?

3) What happens in the electrolysis of H2O? 2H2O --> 2H2 + O2. Do you think it's a chemical change if the water molecule (H2O) changes into hydrogen and oxygen?

4) See #2 and #3 -- is water different from oxygen?

5) This is actually somewhat of a nebulous question. A physical change doesn't actually change the properties of something, but ti can make a new 'product'. For example, ice melting to water is a physical change. Water and ice are different products, but are both H2O.

When you demolish a car, are you making or breaking any molecules in the car, or are you just squishing them around? If you actually change the chemical makeup/molecules of something, then it's a chemical change.

Rust is a change from Fe (iron) --> FeO2 ... do you think this is a chemical change?

I'm not sure what you mean by the "link-up of the atoms". When ice changes to water, the structure of how the molecules arrange is different (ie - ice atoms are less 'packed' than water atoms). Does ice float? Of course it does -- it floats because ice is less dense. Ice is less dense because its atoms aren't as closely packed.

Answer 3

1 False
2 True
3 True
4 True
5 False
6 Demolishing car= physical Rusting=chemical
7&8 the link of atoms changes in that a different structure is formed (a crystal in water) but not the actual atoms in both cases it's H2O

Answer 4

1)F
2)T
3)T
4)T
5)F
Demolishing a car is physical, rusting iron is chemical.
Melting ice does not affect the atomic bonds
Freezing water does not affect atomic bonds.
(You specified 'link-up of atoms.' The MOLECULES are changing their 'link-up' not ATOMS.)

Answer 5

1. False
2. true
3. true
4. true
5. false

Demolition of car: physical rusting: chemical
they do they become more free
yes they become more tightly paced

Answer 6

1)idk
2)true
3)idk
4)true
5)true and false (i think)
chemical
uhh not?
idk sry

Answer 7

F
T
T
T
F
P, C
Y
Y