In liquid water, an equilibrium exists between H2O(ℓ) molecules, H+(aq) ions, and OH−(aq) ions. A person experiencing acid indigestion after drinking tomato juice can ingest milk of magnesia to reduce the acidity of the stomach contents. Tomato juice has a pH value of 4. Milk of magnesia, a mixture of magnesium hydroxide and water, has a pH value of 10. The balanced chemical equation is 2H2 + O2 = 2H2O.
The changes shown are physicalchanges because when ice melts, it turns from solid to liquid.
Physical changes are when a substance changes in how it looks or acts without turning into something else. These changes can usually be undone, which means the substance can be brought back to how it was before.
When ice melts, it turns from solid to liquid. The tiny particles in the ice move around, but the stuff that makes up water stays the same. The process can go backwards, because the water that is a liquid can be turned back into ice.
When water gets really hot, it turns into gas called steam. The water molecules get enough energy to separate from each other and become vapor. Once again, the stuff that makes up water stays the same, and when steam cools down, it turns back into liquid water.
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Answer:
Because physical change are reversible change. we can reverse into the orginal effect.
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The amount of heat energy needed to raise the temperature of 59.7g of cadmium from 25°C to 100°C is 1,034.3J.
The amount of heat energy needed to raise a temperature can be calculated using the following expression;
Q = mc∆T
Where;
According to this question, 59.7g of cadmium is needed to be raised from 25°C to 100°C. The amount of heat needed can be calculated as follows:
Q = 59.7 × 0.231 × (100 - 25)
Q = 1,034.3J
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b. combine compounds to form elements.
c. are always covalent.
d. hold atoms together to form compounds.
. A pyramid of numbers differs from an ecological pyramid because it
a. shows the amount of energy within each trophic level.
b. displays the number of organisms at each trophic level.
c. is organized by trophic levels, while an ecological pyramid isn't.
d. attempts to describe a food chain or food web.
D. displays the number of organisms at each trophic level.
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B. This represents a chemical change only.
C. This represents both a physical and a chemical change.
D. This represents neither a physical change nor a chemical change.