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Question: Molecules can be described as A mixtures of two or more pure substances. B) mixtures of two or more elements that has a specific ratio between components. C) two or more atoms chemically joined together. D) heterogeneous mixtures. E) homogeneous mixtures. The Scientific Method A) is just a theory. B) is a strict set of rules and procedures that lead to inarguab C) isn’t used much in modern chemistry. D) is based on continued observation and experiment. E) is a framework for proving an argument you know to be true. Which of the following are examples of a chemical change? A) coffee brewing B) water boiling C) leaves turning color in the fall D) salt dissolves in water E) None of the above are chemical changes.

Transcribed text From Image:Molecules can be described as A mixtures of two or more pure substances. B) mixtures of two or more elements that has a specific ratio between components. C) two or more atoms chemically joined together. D) heterogeneous mixtures. E) homogeneous mixtures. The Scientific Method A) is just a theory. B) is a strict set of rules and procedures that lead to inarguab C) isn't used much in modern chemistry. D) is based on continued observation and experiment. E) is a framework for proving an argument you know to be true. Which of the following are examples of a chemical change? A) coffee brewing B) water boiling C) leaves turning color in the fall D) salt dissolves in water E) None of the above are chemical changes.

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General guidance

Concepts and reason

Any material with a definite or constant chemical composition is called a chemical substance or pure substance.These substances can be classified into chemical elements, chemical compounds, ions and/or alloys.

Molecule: Molecules are particles formed by the bonding of atoms by any chemical bonds.

Scientific method: It is the method which involves careful observation, experimentation, and evaluation of any hypothesis. Fundamentals

A mixture is formed when two or more types of substances are combined together in definite proportions. Mixtures are of two types: 1) Homogenous mixture 2) Heterogeneous mixture

Homogenous mixture: The components of a mixture which are mixed and are uniformly distributed throughout the mixture is known as a homogeneous mixture.

Heterogeneous mixture: The components of the mixture which are mixed and are not uniformly distributed areknown as heterogeneous mixtures.

Chemical changes: If, in a process, the chemical composition of the constituents change, and a new substance is formed, then the change is a chemical change.

Physical change: If, in a process, the physical state or composition of a substance does not change, then the change is called a physical change. Show less First Step | All Steps | Answer Only

Step-by-step

Step 1 of 6

(1)

The statements that do not describe molecules are given below:

A) Mixtures of two or more pure substances,

B) Mixtures of two or more elements that have a specific ratio between components,

D) Heterogeneous mixtures,

E) Homogeneous mixtures.Explanation | Common mistakes | Hint for next step

Pure substances are those substances made of no other particles. They cannot be further divided into smaller particles. Molecules are not mixtures of pure substances. Two or more elements combine to form a compound, not a molecule. Heterogeneous mixtures are those which contain different types or composition of particles. Homogeneous mixtures are those which contain the same composition of particles.

Ensure that the wrong options chosen are correct.

Correct:

The statements that do not describe molecules are given below:

A) Mixtures of two or more pure substances,

B) Mixtures of two or more elements that has a specific ratio between components,

D) Heterogeneous mixtures,

E) Homogeneous mixtures.

Incorrect:

The statements that do not describe molecules are given below:

A) Mixtures of two or more pure substances,

B) Mixtures of two or more elements that has a specific ratio between components,

C) Two or more atoms chemically joined together,

E) Homogeneous mixtures.

Identify the statement which describes a molecule.

Step 2 of 6

The statement which describes a molecule is as follows:

C) Two or more atoms chemically joined together. Part 1

The statement which describes a molecule is as follows:

A) Mixtures of two or more pure substances,

B) Mixtures of two or more elements that has a specific ratio between components,

C) Two or more atoms chemically joined together,

D) Heterogeneous mixtures,

E) Homogeneous mixtures.
Explanation | Common mistakes | Hint for next step

Molecules made up of atoms. Atoms are bonded together by chemical bonds to form molecules. Molecules may be heteronuclear or homonuclear. If the combined atoms are of the same element, then it is homonuclear. If the combined atoms are of different elements, then the molecule is heteronuclear.

Identify the statement correctly.

Correct:

The statement which describes a molecule is given below:

A) Mixtures of two or more pure substances,

B) Mixtures of two or more elements that has a specific ratio between components,

C) Two or more atoms chemically joined together,

D) Heterogeneous mixtures,

E) Homogeneous mixtures.

Incorrect:

The statement which describes a molecule is given below:

A) Mixtures of two or more pure substances,

B) Mixtures of two or more elements that has a specific ratio between components,

C) Two or more atoms chemically joined together,

D) Heterogeneous mixtures,

E) Homogeneous mixtures.

Identify the wrong statement for the scientific method.

Step 3 of 6

(2)

The wrong statements for scientific method are given below:

A) It is just a theory,

B) It is a strict set of rules and procedures that lead to inarguab,

C) It is not used much in modern chemistry,

E) It is a framework for proving an argument you know to be true. Explanation | Common mistakes | Hint for next step

The scientific methodis not just a theory. The procedures and rules of scientific theory do not lead to any arguments. Since it does not lead to any arguments, it is used in modern chemistry. It also does not stand as a framework for proving an argument that is known to be true.

Ensure that the wrong options are chosen correctly.

Correct:

The wrong statements for the scientific method are as follows:

A) It is just a theory,

B) It is a strict set of rules and procedures that lead to inarguab,

C) It is not used much in modern chemistry,

E) It is a framework for proving an argument you know to be true.

Incorrect:

The wrong statements for scientific method are given below:

A) It is just a theory,

B) It is a strict set of rules and procedures that lead to inarguab,

D) It is based on continued observation and experiment,

E) It is a framework for proving an argument you know to be true.

Identify the correct statement about the scientific method.

Step 4 of 6

The statement that is correct about the scientific method is as follows:

D) It is based on continued observation and experiments.Part 2

The statement that is correct about the scientific method is given below:

A) It is just a theory,

B) It is a strict set of rules and procedures that lead to inarguab,

C) It is not used much in modern chemistry,

D) It is based on continued observation and experiment,

E) It is a framework for proving an argument you know to be true.
Explanation | Common mistakes | Hint for next step

Scientific method is the method which gives detailed knowledge about any matter in the surrounding through careful observation and experimentation. It is the evaluation of any hypothesis. The scientific method evaluates a hypothesis and tests itsvalidity.

Take care while choosing the correct choices.

Correct:

The statement that correct about scientific method is given below:

A) It is just a theory,

B) It is a strict set of rules and procedures that lead to inarguab,

C) It is not used much in modern chemistry,

D) It is based on continued observation and experiment,

E) It is a framework for proving an argument you know to be true.

Incorrect:

The statement that correct about scientific method is given below:

A) It is just a theory,

B) It is a strict set of rules and procedures that lead to inarguab,

C) It is not used much in modern chemistry,

D) It is based on continued observation and experiment,

E) It is a framework for proving an argument you know to be true.

Identify the choices which are not chemical changes.

Step 5 of 6

(3)

The choices which are not chemical changes are as follows:

A) Coffee brewing,

B) Water boiling,

D) Salt dissolves in water,

E) None of the above are chemical changes.Explanation | Common mistakes | Hint for next step

All these choices undergo physical change. Coffee brewing is the making of coffee. Here, only the physical state of the coffee is changed. The constituents or composition of coffee is not changed on the making of coffee.

The other one is water boiling. When water is boiled, water vapor is produced. The physical state of water has only changed. The composition remains the same.

In the case of salt dissolving in water, the salt dissociates into its ions and gets hydrated in water. This is the chemistry of dissolution of salt in water. Here also, the state of salt does not change. It just dissociates into its ions.

Ensure that the wrong options are chosen correctly.

Correct:

The choices which are not chemical changes are as follows:

A) Coffee brewing,

B) Water boiling,

D) Salt dissolves in water,

E) None of the above are chemical changes.

Incorrect:

The choices which are not chemical changes are as follows:

A) Coffee brewing,

B) Water boiling,

C) Leaves turning color in the fall,

E) None of the above are chemical changes.

Identify the statement that is a chemical change.

Step 6 of 6

The example for chemical change is given below:

C) Leaves turning color in the fallPart 3

The example for chemical change is given below:

A) Coffee brewing,

B) Water boiling,

C) Leaves turning color in the fall,

D) Salt dissolves in water,

E) None of the above are chemical changes.
Explanation | Common mistakes

The color change of leaves during fall is considered as a chemical change. The compound which is responsible for the green color of leaves is chlorophyll. When the leaves fall, they stop preparing food and the chlorophyll pigment does not give green color to leaves. Chlorophyll masks the other pigments like anthocyanin, which gives a red color to the leaves. On the degradation of chlorophyll, anthocyanin or other color-giving pigments in leaves like carotenoids give color to the leaves. Thus, the color of the leaves change during fall.

Be careful while choosing the correct option.

Correct:

The example for chemical change is given below:

A) Coffee brewing,

B) Water boiling,

C) Leaves turning color in the fall,

D) Salt dissolves in water,

E) None of the above are chemical changes.

Incorrect:

The example for chemical change is given below:

A) Coffee brewing,

B) Water boiling,

C) Leaves turning color in the fall,

D) Salt dissolves in water,

E) None of the above are chemical changes.

Answer

Part 1

The statement which describes a molecule is as follows:

A) Mixtures of two or more pure substances,

B) Mixtures of two or more elements that has a specific ratio between components,

C) Two or more atoms chemically joined together,

D) Heterogeneous mixtures,

E) Homogeneous mixtures. Part 2

The statement that is correct about the scientific method is given below:

A) It is just a theory,

B) It is a strict set of rules and procedures that lead to inarguab,

C) It is not used much in modern chemistry,

D) It is based on continued observation and experiment,

E) It is a framework for proving an argument you know to be true. Part 3

The example for chemical change is given below:

A) Coffee brewing,

B) Water boiling,

C) Leaves turning color in the fall,

D) Salt dissolves in water,

E) None of the above are chemical changes.

Answer only

Part 1

The statement which describes a molecule is as follows:

A) Mixtures of two or more pure substances,

B) Mixtures of two or more elements that has a specific ratio between components,

C) Two or more atoms chemically joined together,

D) Heterogeneous mixtures,

E) Homogeneous mixtures. Part 2

The statement that is correct about the scientific method is given below:

A) It is just a theory,

B) It is a strict set of rules and procedures that lead to inarguab,

C) It is not used much in modern chemistry,

D) It is based on continued observation and experiment,

E) It is a framework for proving an argument you know to be true. Part 3

The example for chemical change is given below:

A) Coffee brewing,

B) Water boiling,

C) Leaves turning color in the fall,

D) Salt dissolves in water,

E) None of the above are chemical changes.

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