FREE SCIENCE AND STUDY GAMES ABOUT CEMICAL AND

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FREE SCIENCE AND STUDY GAMES ABOUT CEMICAL AND

PHYSICAL EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -26 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: What causes the bubbles in a chemical reaction?

Answer:

Some chemical reactions occur and cause a gas to form. The bubbles are the evidence of the gas fumes escaping

Question 2: electrical conductivity

Answer:

Electrical conductivity is the measure of a material's ability to allow the transport of an electric charge..

Question 3: color

Answer:

We can easily observe the color of a substance by looking at it.

Question 4: melting point

Answer:

The melting point is the point at which a substance changes from a solid to a liquid.

Question 5: hardness

Answer:

Hardness - Hardness is the measure of how difficult or easy it is to scratch a substance.

Question 6: density

Answer:

is how tightly packed the atoms in an object are.

Question 7: solubility

Answer:

Solubility is the measure in which an is one a object deos into another object

Question 8: weigth

Answer:

Weigth is the effect of gravity on the mass of an object (change deping on grv)

Question 9: combustion

Answer:

Combustion is a chemical reaction that produces heat and light.

Question 10: Chemical change examples

Answer:

Some examples of chemical change formation of compund, examples of reacting, examples of oxidation, and examples of toxicity

Question 11: Toxicity

Answer:

Toxicity is the ability or strength of a substance to cause poisonous effects to living things.

Question 12: Chemicla change

Answer:

A chemical change occurs when a substance undergoes a change that creates a new substance with different chemical and physical properties than the original substance. The change is not reversible.

Question 13: physical change examples

Answer:

The form, size, shape, or color of an object can be changed without affecting what makes up the substance.

Question 14: luster

Answer:

Luster - Luster describes how light is reflected off the surface of an object. (How shiny is the object?)

Question 15: mass

Answer:

mass it the amonut of matter (same everwhere)

Question 16: physical property examples

Answer:

Some examples of physical properties are color, odor, size, hardness, luster, phase of matter, mass, density, boiling point, melting point, solubility, and conductivity.

Question 17: physical change

Answer:

A physical change is a change that happens without changing the chemical composition of a substance.No new substance is formed. The change is usually (but not always) reversible.

Question 18: Chemical property

Answer:

A chemical property is a trait or behavior of a substance that gives it the ability or inability to undergo a chemical change.

Question 19: odor

Answer:

Odor - Many substances have a noticeable odor.

Question 20: size

Answer:

Size - The size of a substance can be measured without altering the chemical makeup of the substance.

Question 21: What causes the odor when milk sours?

Answer:

When milk begins to ferment (break down), it smells bad because of the bacteria that is being formed.Chemicals with a sour odor are released by this bacteria

Question 22: Chemical property examples

Answer:

Some examples of chemical properties oxidation ,flammability toxicity, combustibicity, reactiviy and radioactivily

Question 23: What is a precipitate

Answer:

It is an insoluble (can't dissolve) solid that is formed when two liquids combine.

Question 24: Combustibility and flammability

Answer:

Combustibility and flammability both mean the ability a substance has to burn.

Question 25: physical property

Answer:

A physical property is a characteristic of matter that can be observed and measured without changing the identity or chemical makeup of the substance.

Question 26: boiling point

Answer:

The boiling point is the point at which a substance changes from a liquid to a gas .