Answer:
a welding torch requires 4122.8L of ethylene gas at 0.64 atm
Answer:
Correct answer is B.
Explanation:
Took the test and got this right. :)
It shares the most properties with an element in its same row so it is Magnesium.
Answer:
NaCI + O2= NaCIO3 I think
Answer:
![\boxed {\boxed {\sf C. \ Phase \ change }}](https://tex.z-dn.net/?f=%5Cboxed%20%7B%5Cboxed%20%7B%5Csf%20C.%20%5C%20Phase%20%5C%20change%20%7D%7D)
Explanation:
A physical change is one where only physical, not chemical, properties change. Let's analyze each answer choice.
A. Change in odor
- A change in order is one of the signs of a chemical change.
B. Chopping
- Chopping is a physical change, because no new substances are produced. However, it's not reversible. It's impossible to put something chopped back together again permanently.
C. Phase change
- A phase change is another physical change, plus it is reversible. For example, you can freeze water into ice and melt it back to water.
D. Rusting
- Rusting is a chemical change, because new substances are created.
So, the best answer choice for a reversible physical change is <u>C. phase change</u>.