John hypothesized that dissolving salt into water produced a chemical reaction because the salt completely disappeared in the water. He dissolved 10 grams of salt into 500 mL of pure water. After leaving the beaker in the sunlight a few days, the water completely disappeared and salt crystals were left in the bottom of the beaker. Based on this observation, John knew his hypothesis was incorrect because-
Answer:
Explanation:
John knew his hypothesis was incorrect because he was left with the exact some compounds as he had started with. Something is only a chemical reaction if it changes the actual chemical structure and/or identity of a reactant. In this case, John mistook a physical change for a chemical change. The salt changes forms from solid to aqueous (dissolved in water), but did not change on a molecular level. Also, no new products were produced in the reaction and it did not show any of the 5 indicators of chemical reactions (temperature, colour and/or odour changes, formation of precipitate, production of a gas)
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You work for REV, Incorporated. Based on the documents provided, what does RPS most likely stand for?
Answer: Remote Private System
Explanation:I took this already I’m sure this the answer
what is kim taehyungs phone number
Answer:
who knows.
Explanation:
Religious affiliations are an example of which type of data?
Answer:
it is deemed personal data grouped with
Explanation:
racial or ethnic origin;
political opinions;
religious or philosophical beliefs;
trade union membership;
processing of genetic data;
biometric data for the purpose of uniquely identifying a natural person;
health;
sex life or sexual orientation.
Applying critical thinking skills is an effective way to avoid being sidetracked by irrational thoughts. Please select the best answer from the choices provided T F
Answer:
it is true
Explanation:
because i looked it up and it said true
Answer:
true
Explanation:
. Suppose that you prefer reading a book you already own to watching TV and that you prefer watching TV to listening to music. If these are your only three choices, what is the opportunity cost of reading? watching TV and listening to music watching TV listening to music sleeping the price of the book
A:watching TV and listening to music
B:watching TV
C:listening to music
D:sleeping
E:the price of the book
Answer:
B. Watching TV
Explanation:
Opportunity cost is a term used used to express cost in terms of forgone alternatives. It is a sacrifice made in order to choose something else.
Opportunity cost also refers to the gain, enjoyment, benefits that one would have gain but looses such as a result of preferring one alternative to another. With regards to the above, the opportunity cost of reading is watching TV because one must sacrifice watching TV for a book, hence reading a book means that there will be no TV to watch.
Sociology has been described by some as the study of common sense explain why you agree or disagree with this statement
Answer:
i disagree
Explanation:
sociology has always being described as the study of human behavior or the study of the development, structure, and functioning of human society.
which of the following is not a common criticism of piaget's theory?
Answer:
Explanation:
There have been a number of criticisms levelled at Piaget's theory. Piaget offers these terms up to indicate a change that has occurred in a child, but what exactly has changed? Piaget does not offer a specific operationalised definition that would guide ... A major criticism stems from the very nature of a stage theory.
There exists a criticism of the theory of Piaget as he tells us about the changes that occur in children. Each stage of child development form criticism in his theory.
What is pages theory?Piaget's theory is a theory of cognitive development and suggests that children move to from the lower to higher stages of mental development. His theory forms on the basis of how children acquire knowledge. Piaget makes use of critical change that takes place in children.
Find out more information about Piaget's theory.
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