Precipitation, evaporation, condensation
Answer:
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>.
Answer:
Cacti remain homeostasis because of the lack of leafs it has, because it has no leaves it absorbs less heat keeping more water, it also has a nice waxy coat that remains moist and grows depending on the amount of water it holds, and it's stem acts as a water supply keeping the plant fed and cool in harsh ecosystems.
Hope this helps.
Answer:
of the following statements about a Brønsted-Lowry base is true? Group of answer choices
i. All Brønsted-Lowry bases contain a lone pair of electrons or a π bond.
ii. The net charge may be zero, positive, or negative.
iii. The net charge may be zero or positive.
iv. All Brønsted-Lowry bases contain a proton.
Answer: Only i. Is true.
Bronsted Lowry defines acid as proton donors. Bronsted Lowry defines the base species as that which can accept proton.
Explanation:
In order to accept a proton, a Brønsted-Lowry base must have at least one lone pair of electrons or pi (π) bond to form a new bond with a proton.
An acid-base reaction using the Brønsted-Lowry definition, is any reaction in which a proton is transferred from an acid to a base. We can use the Brønsted-Lowry definitions to discuss acid-base reactions in any solvent, as well as those that occur in the gas phase