All categories

2 years ago

1. Distinguish between physical and chemical changes. Include examples in your explanations.

Biology

2 answers:

Rashid [163]2 years ago

8 0

Answer:

Physical change

Any change to the physical properties of a substance is called a physical change.

Physical changes are usually reversible as no new substance is formed. It is the same substance but with changed physical properties.

Chemical change

A change in which one or more new substances are formed is called as a chemical change.

Usually a chemical change involves a chemical reaction, which forms new products.

Example : Rusting of Iron, or burning wood.

Explanation:

have a good day <3 sorry i could answer q1 only ill think baout the others..

777dan777 [17]2 years ago

7 0

Answer:

A physical change is one in which altering the substance doesn’t change its composition. In other words, this is a change in the form of a substance without the production of a new substance. Physical changes can include breaking up the substance into smaller pieces or altering its state of matter.

A chemical change does involve a change in the substance’s composition. Here the change in the composition of a given substance causes a new substance to be produced in place of the original substance. Burning a match is an example of a chemical change.

Elements, which are listed in the periodic table of elements, are substances that can’t be broken down any further by ordinary types of chemical change.

Compounds consist of two or more elements that are combined chemically in such a way that the elements themselves can no longer be identified by their individual properties.

Mixtures consist of two elements mingled together without combining chemically. The individual properties of each material are maintained.

Shape Volume

Solid Definite (holds shape) Definite (fixed volume)

Liquid No definite shape (takes the shape of the container) Definite (fixed volume)

Gas No definite shape (takes the shape of the container) No definite volume (takes the volume of the container, but will expand indefinitely if not contained)

Atomic mass is generally equal to the sum of the number of protons plus the number of neutrons in an atom. This can be found in reference charts and on the periodic table, typically below the element’s chemical symbol.

Molecular mass is found by adding up all of the atomic masses of all of the individual atoms in one molecule of a compound.

Location Charge

Proton nucleus positive

Neutron nucleus no charge (neutral)

Electron shells (orbitals) surrounding the nucleus negative

Dalton’s atomic theory makes the following assumptions:

All matter consists of small particles called atoms.

All atoms of the same element are alike in size, shape, and weight, but differ in these properties from the atoms of the other elements.

Chemical reactions take place between atoms, and even in the most violent chemical reactions, the atoms don’t break into pieces.

Atoms combine with other atoms to form molecules.

Explanation:

You might be interested in

Which of the following is true? Group of answer choices In the brain, neurons are more abundant than neuroglia. An action potent

mr_godi [17]

Answer:

The true statements are:

An action potential never occurs in dendrites.

Norepinephrine is a monoamine.

Explanation:

In the following question only two statements are true that are; an action potential never occurs in dendrites as it occurs in nerves to send signals from cell body and axon and transmit it.

The second correct statement is Norepinephrine is a monoamine as these are particular neurotransmitters dopamine, serotonin, also known as catecholamines sometimes.

Thus, the correct answer is :

An action potential never occurs in dendrites.

Norepinephrine is a monoamine.

6 0

3 years ago

What is the molecule in this image?

Ratling [72]

Answer:

Protein.

Explanation:

In the image above, we see a molecule that is made up of several amino acids. The molecule that is made up of amino acids is protein.

Proteins are the most abundant organic macromolecules in cells, fundamental to cell structure and function. They are found in all cell types and viruses.

They are formed by amino acids linked together and joined by peptide bonds, as shown in the image above.

Of extremely high molecular weight, proteins are composed of carbon, hydrogen, nitrogen and oxygen, practically all of them have sulfur. Elements such as iron, zinc and copper may also be present.

All proteins are made up of a set of 20 amino acids, arranged in varying specific sequences.

3 0

3 years ago

In 3-4 sentences, explain how Waste Management is contributing to conservation efforts.

tekilochka [14]

Answer:

Recycling saves energy, helps keep materials out of landfills and incinerators, and provides raw materials for the production of new products. It converts organic materials, like food waste and yard trimmings, into a valuable soil amendment that contributes to soil health and keeps organic wastes out of landfills.

Explanation:

Recycling saves energy, helps keep materials out of landfills and incinerators, and provides raw materials for the production of new products. When waste cannot be prevented, recycling is the next best option. Recycling is more than extending the life of landfills. It is about making the best use of the resources we have available and conserving those resources for future generations. It is about conserving water, energy, land and raw materials.

Composting is recycling for organics. It converts organic materials, like food waste and yard trimmings, into a valuable soil amendment that contributes to soil health and keeps organic wastes out of landfills.

7 0

3 years ago

5. What type of energy is needed for active transport?

Leya [2.2K]

ATP( adenosine triphosphate )

6 0

3 years ago

Read 2 more answers

Describe the importance of the inner membranes separating different regions of the mitochondrion and the chloroplast.

cupoosta [38]

Answer:

The thylakoid membrane is responsible for separation of different regions of the mitochondrion and the chloroplast.

This membrane is responsible for the major difference between chloroplasts and mitochondria in terms of their structure and function.

The membrane is very important in chloroplasts and it fills the role of the inner mitochondrial membrane in electron transport and the chemiosmotic generation of ATP.

4 0

3 years ago

Read 2 more answers