Understanding the Conservation of Matter

What is the definition of Conservation? Conservation means ________.

• the protection, preservation, management, or restoration of natural resources

• the destruction of natural habitats for urban development

• the increase in pollution levels in natural areas

• the exploitation of resources without any regulation

Answer explanation

Conservation refers to the protection, preservation, management, or restoration of natural resources, making the first answer choice the correct definition. The other options describe harmful actions contrary to conservation.

What is the definition of Matter? Matter is ________.

• anything that has mass and takes up space

• a type of energy that moves in waves

• only the air we breathe

• something that cannot be seen or touched

Answer explanation

Matter is defined as anything that has mass and takes up space. This includes all physical substances, unlike the other options which describe energy, air, or intangible concepts.

What is a Chemical Reaction? A chemical reaction is ________.

• a process in which substances (reactants) are transformed into different substances (products)

• a process where substances remain unchanged

• a process that only involves physical changes

• a process that does not involve any transformation

Answer explanation

A chemical reaction is defined as a process in which substances (reactants) are transformed into different substances (products). This distinguishes it from processes that do not involve any transformation.

Reactants are (a)   .

• the original substances in a chemic

• the products formed after a chemica

• the catalysts that speed up a react

• the energy released during a reacti

Answer explanation

Reactants are defined as the original substances in a chemical reaction. They undergo transformation to form products, making the first answer choice the correct one.

Match the following terms with their correct definitions in a chemical reaction.

• Reactants

• the catalysts that speed up the reaction

• Products

• the energy released during the reaction

• Energy

• the substances formed as a result of a chemical reaction

• Catalysts

• the reactants before the reaction starts

What is Mass? Mass is ________.

• the amount of matter in an object

• the space an object occupies

• the weight of an object on Earth

• the color of an object

Answer explanation

Mass is defined as the amount of matter in an object, making it the correct choice. The other options describe different properties: space (volume), weight (force due to gravity), and color (appearance).

What is a Closed System? A closed system is ________.

• a system where no matter can enter or leave

• a system where energy and matter freely enter and leave

• a system that only allows energy to enter or leave

• a system that exchanges both matter and energy with its surroundings

Answer explanation

A closed system is defined as a system where no matter can enter or leave, meaning it is isolated from its surroundings in terms of matter, while energy may still be exchanged.

What is a Balanced Equation in chemistry? A balanced equation is ________.

• an equation where the number of atoms of each element is the same before and after the reaction

• an equation where the reactants and products are always gases

• an equation that only uses coefficients of one

• an equation that does not include any products

Answer explanation

A balanced equation ensures that the number of atoms for each element is equal on both sides of the reaction, reflecting the law of conservation of mass. This is crucial for accurately representing chemical reactions.

Match the scientific terms with their correct meanings.

• Relocate

• increase in size only

• Grow

• change in form, appearance, or structure

• Transform

• remain the same forever

• Permanent

• move from one place to another without changing

What does Decompose mean in science? To decompose means to ________.

• break down into simpler substances

• combine into more complex substances

• move rapidly

• change color

Answer explanation

To decompose means to break down into simpler substances. This process is essential in science, particularly in biology and chemistry, where complex organic materials are transformed into simpler components.