When a substance undergoes a physicalchange, its chemical composition remains the same, and there is no formation of new substances.
A physical change is a process in which the physical properties of a substance are altered, but its chemical composition remains unchanged. In other words, the substance does not undergo a chemical reaction, and no new substances are formed. Instead, the changes observed are related to the state of matter or the physical properties of the substance.
Examples of physical changes include changes in state (such as melting, freezing, boiling, or condensing), changes in shape or size (like cutting, crushing, or bending), and changes in appearance (such as dissolving, mixing, or separating). These changes are usually reversible, and the substance can often be restored to its original state by reversing the process.
One characteristic of physical changes is that they do not involve the breaking or forming of chemical bonds between atoms or molecules. The individual particles of the substance (atoms, ions, or molecules) remain the same before and after the change. For example, when ice melts into liquid water, the water molecules remain H₂O molecules throughout the process.
In contrast, chemical changes (also known as chemical reactions) involve the rearrangement of atoms and the formation of new substances with different chemical properties. In a chemical change, the original substances are consumed, and entirely new substances are produced.
Understanding the difference between physical changes and chemical changes is essential in various scientific fields, including chemistry and materials science. It helps scientists distinguish between alterations in the physical appearance of a substance and fundamental changes in its chemical nature.
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The complete question is:
What happens when a substance undergoes a physical change?
Answer:
HERES ALL THE TEST ANSWERS
Explanation:
Physical Properties
1-What happens when a substance undergoes a physical change?
answer-Some physical properties change, but the substance keeps its identity.
2-What is an example of a physical change?
answer-ice forming and then melting back into water
3-When liquid gold becomes a solid, its particles get closer together. Which best describes what happened to the gold?
answer-the rearrangement of particles in a physical change
4-Eugene describes the physical property of a material as “sweet and floral.” What physical property of the material is Eugene most likely observing?
answer-odor
5-Which can occur during physical change?
answer-The particles can arrange in different ways.
6-If there is 8 g of a substance before a physical change, how much will there be afterwards?
answer- 8 grams
7-Which statement about the physical change of liquid water boiling into steam is true?
answer-the heat added represents an energy change
8-Fifteen grams of a liquid plastic are frozen in a physical change that increases the volume. What can be known about the plastic after the change?
answer- it will still weigh 15 grams
9-Which statement best compares and contrasts two physical properties of matter?
answer-Boiling points and melting points are similar because they both involve the change in a state of a material, but they are different because boiling point involves a change from a liquid to a gas and melting point involves a change from a solid to a liquid.
10-Serena is mixing a material into a beaker filled with a liquid. She notices that the material seems to disappear into the liquid. What physical property of the material is Serena most likely observing?
answer-solubility
Species originate through adaptation by natural selection.
Species originate through paleontological changes.
Species originate through changes in allele frequencies.
In the 1800s, Darwin explains the origin of species. As species originate through adaptation by natural selection.
Answer: Species originate through adaptation by natural selection
Explanation:
The Origin of species through natural selection is a pioneering scientific effort of the British naturalist Charles Darwin in England. Darwin's theory is that organisms are gradually evolving through what is called "natural selection"
It is a process in which organisms change due to hereditary changes in physical or behavioural traits. Changes that allow the body to better adapt to its surroundings, help it survive and have more offspring.
B. compounds,cells,tissues,organs,
C. molecules, atoms, elements,compounds
D. atoms, organs, cells, organs systems
Answer:
Explanation:
Sunflowers use a cross-pollination method of reproduction by attracting animals and insects such as bees and using them to spread reproductive pollen from one flower to another as well as the seeds the folower produces.