Science Grade 8 Mid Term Assesment

Mass refers to the amount of matter in an object, and it remains constant regardless of the location, while weight is the measure of gravity acting on an object and can vary depending on the gravitational pull at different locations.

The incorrect answers provided do not accurately describe properties of matter as outlined in the correct answer. Weight is different from density, transparency is different from solubility, and flexibility is not equivalent to ductility or malleability.

Inertia is the tendency of an object to resist a change in motion, whether the object is at rest or moving. It is not related to the force of gravity, buoyancy, or speed.

Chemical properties describe how a substance behaves in the presence of other substances, such as undergoing a chemical reaction. Examples include flammability and reactivity.

Solids have a definite volume because they have a fixed shape, while liquids do not have a definite shape but have a definite volume. Gases, on the other hand, do not have a definite shape or volume.

The Atomic Theory was initially proposed by the Ancient Greeks, laying the foundation for our modern understanding of atoms and matter.

In this question, it is important to distinguish between mixtures and compounds. While mixtures can be separated by physical means, compounds are chemically combined. Solutions specifically refer to homogeneous mixtures, and the term 'homogeneous' means that samples taken from different areas of the mixture would be the same.

The nucleus is the dense, central region of an atom that contains protons and neutrons.

An ion is an atom or molecule that has gained or lost electrons, resulting in a negative or positive charge.

In an atom, each energy level has a maximum capacity of electrons as follows: 1st energy level can hold up to 2 electrons, 2nd energy level can hold up to 8 electrons, and 3rd energy level can hold up to 8 electrons. The total number of electrons in an atom is equal to its atomic number.

In an atom structure, protons are positively charged particles, neutrons are neutrally charged particles, and electrons are negatively charged particles. The rings around the nucleus represent energy levels where electrons are found.

When testing for gases, it is important to use specific indicators or methods that react to the presence of the gas in question. The correct test for each gas is essential to accurately identify its presence in a sample.

The correct answer explains the fundamental building block of an element, maintaining its unique properties.

The periodic table is a systematic way of organizing the chemical elements based on their atomic numbers and properties.

Photosynthesis involves the conversion of water, carbon dioxide, and light energy into glucose sugar and oxygen gas. The correct symbol and word equation for photosynthesis is A.

The correct interpretation of 2CuSO4 is that each molecule of copper sulfate contains 2 atoms of copper, 1 atom of sulfur, and 4 atoms of oxygen, resulting in a total of 2 atoms of each element in the molecule.