1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
SVETLANKA909090 [29]
3 years ago
5

A student takes four samples of a white crystalline solid and places each in a well plate. On top of each sample, she carefully

places 20 drops of clear mystery liquids A, B, C and D. Her results for each well are: Liquid A: The solid dissolves quickly. Liquid B: The solid appears unchanged. Liquid C: The solid floats on top of the liquid. Liquid D: Fizzing occurs and the solid disappears. Which combination of solid plus liquid indicates a chemical change has taken place?
Biology
2 answers:
DaniilM [7]3 years ago
7 0

Dissolving doe not indicate or guarantee a chemical change.  Most of the time it is a physical change.

Unchanged solid in a liquid does not even indicate any change.

Solid floating on top of liquid does not indicate any change, physical or chemical.

When a mixture creates a new compound (gas from mixing solid and liquid), there is a chemical change.

xxMikexx [17]3 years ago
3 0

Answer:

The administration of liquid D shows a chemical change taking place.

Explanation:

A chemical reaction or a chemical change refers to a procedure where one or more components get changed into one or more novel and distinct substances. It can be said that a chemical change refers to a chemical reaction in which the realignment of atoms takes place.  

A physical change can get reversed, while a chemical change generally cannot get reversed. When a chemical change takes place, there is also a variation in the system's energy. A chemical change, which emits heat is known as an exothermic reaction, and the one that captivates heat is known as an endothermic reaction.  

When the liquid D is placed over the white crystalline solid, fizzing took place and the solid got disappeared. Thus, the solid form got transformed into a new substance with a fizzing sound showing the emergence of heat, all this indicates a chemical change taking place.  

You might be interested in
Describe how the smoking ban and increasing taxes on alcohol are designed to improve the health of nation
nasty-shy [4]
Because smoking can cause many different bad things to happen to you some examples would be lung cancer or if you smoke while you are pregnant you cold cause premature or birth defects to the baby, alcohol can just be bad a lot of the time because people can become addicted and loose a lot of money on buying alcohol and/or smoking materials.
5 0
3 years ago
the graph predicts the effect that each factor would have on the biodiversity of the mediterranean sea in the next 10 years. how
bixtya [17]

Answer: Exploitation, invasive species

If the government introduces laws prohibiting hunting, it would somewhat reduce the impact of exploitation would have on the biodiversity because hunting is mainly done for the purpose of fun or to derive valuables from animals like skin, horn, ivory, venome for selling them in the international market and making huge profit from them. Introduction of prohibition law on hunting will reduce killing and exploitation of animals for their valuables.

If laws prohibiting introduction of new plant or animal species within the country are passed, it will curb the effect of invasive species would have on the seas. Invasive species are those living species which are arrive or immegrate to new locations in search of resources. These species compete with native species which results in decline of native species. This will result in disturbance in actual sea biodiversity as this will result in decline in native sea species and may also lead to extinction of native species.

9 0
3 years ago
Read 2 more answers
A drug decreases heart rate by blocking a receptor on cardiac muscle cells. this drug probably binds to:
jolli1 [7]
Njfhuj gjjff yuku unkind hkkr ikhrb
7 0
3 years ago
A neuron transmits information by the secretion of hormones. True or False
grandymaker [24]

Answer:

The given statement is false.

A neuron is the basic structural and functional unit of the nervous system. It helps in transmitting information from one neuron to another neuron, gland, or muscle cell.

The conduction of nerve impulse is electrochemical in nature. It transmits the impulse electrically through the axon the nerve cells and chemically through synapses (gap between two nerves cells).

The axon terminals of pre-synaptic nerve cell release chemical messengers (also called neurotransmitters) in the synaptic cleft. These messengers then bind to the receptors present on the post-synaptic nerve cell and regenerate the nerve impulse.

4 0
3 years ago
Read 2 more answers
Think about the fact that some of the reactions that break down glucose occur in different parts of the cell than others. What p
IrinaK [193]
Explanation: some cells are specialized to do certain stuff. Like the breaking down of glucose wouldn't happen in the cells found in your leg.
4 0
3 years ago
Read 2 more answers
Other questions:
  • The two main parts of photosynthesis are know as?
    12·1 answer
  • What are the weather events related to a stationary front?
    13·1 answer
  • Which organelle is the store house for most of a cells genetic information
    12·2 answers
  • Please help me with my science I’ll give brainliest
    9·2 answers
  • Two ways that bacteria cause disease are
    6·1 answer
  • What happend to addie in 2014
    15·1 answer
  • Which method would be the most powerful approach to isolating a single mutant from a population of billions?
    8·2 answers
  • Can anyone help me write hard questions that you may have about Photosynthesis & Cellular Respiration? (This is for a survey
    13·1 answer
  • In the biogeochemical cycle for carbon, the same atoms of this element are moved and recycled around the planet through which sp
    7·2 answers
  • Which cellular process most directly ensures the formation, growth, and repair of specialized tissues in multicellular organisms
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!