Which is an example of a chemical change?
Answers
Answer:
Example: Burning wood
Souring milk
Mixing acid and base
Baking a cake
Explanation:
Chemical changes occur when a substance combines with another to form a new substance.
Example: Burning wood
Souring milk
Mixing acid and base
Baking a cake
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For the reaction below, describe the temperature and pressure conditions that would produce the highest yield of the forward reaction. Explain your answer in terms of Le Châtelier's principle.
Match each of the following fat-soluble vitamins with the unit used to express the amount required in the diet. A: microgram. B: miligram
Answers
Explanation:
Answer and Explanation:
Oxygen-16 and oxygen-18 differ in structure only in that oxygen-18 has two more neutrons in its nucleus than oxygen-16 has.
There are three known stable isotopes of oxygen (8O): 16O, 17O, and 18O. Radioactive isotopes ranging from 11O to 26O have also been characterized, all short-lived.
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Answers
Answer: B. lipids
Explanation:
When an individual has an energy surplus, the extra energy is stored in the body as lipids. Lipids are used for energy in the long term
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Answer:
it has 3 valence electrons
Explanation:
2+2+1 is 5, boron is 5 and its in the 3rd group
b. stronger intermolecular forces than iodine
c. lower average kinetic energy than iodine
d. higher average kinetic energy than iodine
Answers
They can be created by chemical reactions.
They can consist of no more than two types of elements.
They all have the same properties regardless of their elemental composition.
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Compounds have varying properties, depending on the compounds they are made from, and are created by chemical reactions.
Answer: The correct option is that the compounds are created by chemical reactions.
Explanation:
Option 1: Elements combine chemically in a specific ratio to form compounds. They can't be separated by physical methods like filtration. For example, is made up 2 H-atoms and 1 O-atom. When we filter water through normal filtration, we do not obtain H-atom and O-atom separately, but we get combined form of hydrogen and oxygen atom that is
.
Option 2: Compounds are formed when two or more elements combine chemically.
Option 3: Compounds can have more than two types of elements. For example, In , 3 elements are present - Calcium(Ca), Carbon(C), Oxygen(O).
Option 4: Compounds formed have different properties from one another. There can be difference in physical properties as well as chemical properties. For example, (water) and
(calcium carbonate) are two compounds. Water is present in liquid state and calcium carbonate is present in solid state. Hence, it showed that all the compounds cannot have same properties.
Answers
A. ∆G=negative, ∆H= positive, ∆S= positive, T = large
B. ∆G=positive, ∆H= positive, ∆S= positive, T = large
C. ∆G=negative, ∆H= negative, ∆S= positive, T = large
D. ∆G=negative, ∆H= positive, ∆S= negative, T = large
E. ∆G=positive, ∆H= positive, ∆S= negative, T = large
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