Chemical And Physical Properties

  • NGSS
  • AP Chemistry
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1. What is the universal solvent?

Explanation

Water is considered the universal solvent because it has the ability to dissolve a wide range of substances. This is due to its unique molecular structure, which allows it to form hydrogen bonds with other molecules. These hydrogen bonds break apart the solute particles and surround them, dispersing them evenly throughout the solvent. Water's polarity also enables it to dissolve both polar and nonpolar substances, making it an effective solvent for many different compounds. Additionally, water's abundance and accessibility in nature make it the most widely used solvent in various biological, chemical, and industrial processes.

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2. Which is a list of physical properties of a substance that can be observed or measured without changing the it's identiy?

Explanation

The list of physical properties of a substance that can be observed or measured without changing its identity includes color, shape, texture, odor, melting point, boiling point, density, and solubility. These properties can be determined through visual observation or by conducting experiments that do not alter the chemical composition of the substance.

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3. Even though all solid states of other materials are denser than the liquid states of materials, what is a unique property of water?

Explanation

One unique property of water is that its solid state, ice, is less dense than its liquid state. This means that ice floats in water, which is not commonly observed with other materials. This property is due to the hydrogen bonding between water molecules, which causes them to arrange in a lattice structure when frozen, resulting in increased space between the molecules and lower density.

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4. Which chemical property means the ability for a substance to burn?

Explanation

Combustibility refers to the ability of a substance to burn. It is a chemical property that indicates the likelihood of a material to ignite and sustain a fire or combustion process. Substances with high combustibility are easily ignited and burn readily, while those with low combustibility require more heat or oxygen to ignite. Acidity, reactivity, and basicity are other chemical properties that are unrelated to the ability to burn.

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5. What temperature does water turn into ice freezes?

Explanation

Water freezes at 0 degrees Celsius because this is the temperature at which its molecules slow down and form a solid lattice structure. At temperatures below 0 degrees Celsius, water molecules lose energy and arrange themselves into a crystal lattice, resulting in the formation of ice.

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6. Referring to question number 7, what are the materials in an experiment that are kept the same such as the soil, water, and plants?

Explanation

In an experiment, the materials that are kept the same, such as the soil, water, and plants, are called constants. These are factors that are intentionally kept unchanged throughout the experiment in order to isolate and analyze the effect of the independent variable on the dependent variable. By keeping these materials constant, any changes observed in the dependent variable can be attributed solely to the independent variable being tested.

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7. What measures the average kinetic energy of the atoms and molecules in matter?

Explanation

Temperature measures the average kinetic energy of the atoms and molecules in matter. It is a measure of how fast the particles are moving and how much energy they possess. The higher the temperature, the greater the average kinetic energy of the particles. Temperature is typically measured in units such as degrees Celsius or Fahrenheit.

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8. Referring to question number 7, what is the dependent variable?

Explanation

The dependent variable in this question is the height the plants grow. The dependent variable is the factor that is being measured or observed in an experiment and is expected to change in response to the independent variable. In this case, the height of the plants is being measured, and it is expected to vary based on the other variables such as the soil, water, and lights.

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9. What is the independent variable of an experiment if you place three of the same types of plants in the same type of soil, then give them the same amounts of water each day, but place them under different colored light?

Explanation

In this experiment, the independent variable is the lights. The independent variable is the factor that is intentionally manipulated or changed by the researcher. In this case, the researcher is placing the plants under different colored lights. By doing so, they are testing how different colored lights might affect the growth or development of the plants. The other variables, such as the soil, the plants, and the water, are kept constant in order to isolate the effect of the lights on the plants.

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What is the universal solvent?
Which is a list of physical properties of a substance that can be...
Even though all solid states of other materials are denser than the...
Which chemical property means the ability for a substance to burn?
What temperature does water turn into ice freezes?
Referring to question number 7, what are the materials in an...
What measures the average kinetic energy of the atoms and molecules in...
Referring to question number 7, what is the dependent variable?
What is the independent variable of an experiment if you place three...
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