CHEMISTRY MIDDLE SCHOOL

Can you describe how mixtures relate to substances?

Answers

Answer 1
Answer: A substance in chemistry is a form of matter consisting having fixed chemical composition (like water). A mixture is a material made up of two or more substances (like water with sugar) - mixed, but not combined with chemical bonding.
Answer 2
Answer: A substance is a pure form of matter in which all the constituent particles are the same in their chemical nature, while a mixture is a combination of two or more substances. A substance cannot be separated into other kinds of matter by any physical process. But a mixture can be separated into pure substances  by appropriate separation techniques such as filteration, sedimentation, evaporation, crystallisation, etc..

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______ keeps the Earth from becoming too hot during the day and too cold at night. A. Insulation
B. The greenhouse effect
C. Solar radiation
D. Air conditioning

Answers

B.the greenhouse effect
The Answer is B) because of different changes

How does the absorption and release of energy affect temperature change during a chemical reaction?

Answers

If heat is absorbed, the temperature increases.

If heat is released, the temperature decreases.

Hope I helped. :)

an, 13 Students set up two environments see which one best supports growth of hibiscus flowers. One environment is created as a desert, using The plant is exposed to high temperatures. The a tropical other environment is create exposing the forest, using soil and the plant to high temperatures. What is variable used in the investigation? 5.2(A) CA The temperature The environmen The type of flower The amount of sunlight in D

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B. The Enviroment. The Soil and Humidity are differant. They both have high tematures, they use the same flowers in both, Hibiscus. The tropical environent should help the Hiviscus grow better.

what best explains why the use of fossil fuels for energy production is a not a long-term solution to the world's energy needs?

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We can't use fossil fuels forever, someday we will run out of coal for example.

Evaporating water is an example of a physical change because

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Answer:

Because it will go back to water when it rains

Explanation:

what rule can you state about the relationship between phase changes and temperature?Between phase changes and heat energy

Answers

The phase does not change until the substance is at the same temperature. Hope this helps! By the way, this was the answer for the question "What rule can you state about the relationship between phase changes and temperature"

Final answer:

Phase changes occur at specific temperatures under standard pressure and involve either absorption or release of heat energy. This process involves the modification of kinetic energy and intermolecular forces.

Explanation:

The relationship between phase changes and temperature or heat energy is that phase changes occur at specific temperatures under standard pressure and involve either absorption or release of heat energy. This is based on the theory of kinetic energy and intermolecular forces. For instance, when ice melts to become liquid water (also known as melting), it does it at a specific temperature which is 0 degrees Celsius under 1 atm pressure. During this phase change, the ice absorbs heat energy from the surroundings without changing its temperature.

Learn more about Phase Changes here:

brainly.com/question/32745747

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