If you do not perceive a color change, or the emission of light or heat, it is still possible a chemical reaction has taken place.
A chemical change involves a change in the composition of a substance. It leads to the rearrangement of atoms and formation of a new substance.
Some cues may help us to know when a chemical change has taken place such as;
- Change in color
- Formation of a solid
- Evolution of heat
- Evolution of a gas
It is possible for a chemical change to occur without noticing these cues. For instance, two colorless solutions may react with each other and the product of the reaction remains colorless.
In this case, there is no physical cue signifying that a chemical change has taken place even though it actually happened.
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Answer: A variety of <u>microorganisms</u> can cause disease. Pathogenic organisms are of five main types: <u>viruses, bacteria, fungi, protozoa, and worms.</u> Some common pathogens in each group are listed in the column on the right. <u>Infectious agents can grow in various body compartments, as shown schematically in Fig.</u>
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Answer:
I think that 4 is the answer, sorry if I am wrong
Cohesion is the grammatical and lexical linking within a text or sentence that holds a text together and gives it meaning.
Answer: The supercontinent cycle is the quasi-periodic collection and dispersal of Earth's continental crust. There are different theories as to whether the volume of continental crust is rising, fading, or lingering about the same, but it is accepted that the Earth's crust is constantly moving.
