1.
What are the two types of pure substances?
Correct Answer
C. Atoms and Compounds
Explanation
Atoms and compounds are the two types of pure substances. Atoms are the basic building blocks of matter and cannot be broken down into simpler substances. Compounds, on the other hand, are made up of two or more different types of atoms chemically bonded together. Both atoms and compounds have definite chemical compositions and distinct properties, making them pure substances.
2.
What are the two types of Mixtures?
Correct Answer
D. Homogeneous and Heterogeneous
Explanation
Homogeneous and heterogeneous are the two types of mixtures. A homogeneous mixture is a mixture that has a uniform composition throughout, meaning that the components are evenly distributed and not easily distinguishable. On the other hand, a heterogeneous mixture is a mixture that does not have a uniform composition, meaning that the components are not evenly distributed and can easily be distinguished.
3.
One specific type of homogeneous mixture is:
Correct Answer
C. A solution
Explanation
A solution is a specific type of homogeneous mixture where a solute is dissolved in a solvent. In a solution, the solute particles are evenly distributed throughout the solvent, resulting in a uniform composition. This distinguishes a solution from other types of mixtures like compounds, elements, and atoms, which do not necessarily have a uniform composition. Therefore, a solution is the correct answer as it accurately describes a specific type of homogeneous mixture.
4.
Cookies and cream ice cream would be classified as:
Correct Answer
B. A heterogeneous mixture
Explanation
Cookies and cream ice cream would be classified as a heterogeneous mixture because it is made up of different components that are visibly distinct. In this case, the ice cream contains visible pieces of cookies, which are dispersed throughout the creamy base. The presence of these distinct components makes it a heterogeneous mixture rather than a homogeneous mixture, which would have a uniform composition throughout.
5.
Table salt, also known as sodium chloride would be classified as:
Correct Answer
D. A compound
Explanation
Table salt, also known as sodium chloride, is classified as a compound because it is made up of two elements, sodium (Na) and chlorine (Cl), which are chemically bonded together in a fixed ratio. A compound is a substance composed of two or more different elements that are chemically bonded together. In the case of table salt, sodium and chlorine combine to form sodium chloride, resulting in a compound with distinct properties and a uniform composition throughout.
6.
A glass of Kool-Aid would be classified as:
Correct Answer
A. A homogeneous mixture
Explanation
A glass of Kool-Aid would be classified as a homogeneous mixture because it is a combination of water, sugar, and flavoring that is evenly distributed throughout the drink. This means that the composition and properties of the Kool-Aid are uniform throughout, making it a homogeneous mixture.
7.
Helium would be classified as:
Correct Answer
C. An element
Explanation
Helium would be classified as an element because it is a pure substance that cannot be broken down into simpler substances by chemical means. It consists of only one type of atom, helium atoms.
8.
The prefix homo- means:
Correct Answer
A. Same
Explanation
The prefix "homo-" is derived from the Greek word "homos" which means "same". It is commonly used in English to indicate similarity or sameness. For example, words like "homogeneous" and "homosexual" use this prefix to convey the meaning of "same kind" or "same sex". Therefore, the correct answer is "same".
9.
Two elements of chemically combined define:
Correct Answer
D. A compound
Explanation
A compound is formed when two or more elements chemically combine. In a compound, the atoms of different elements are bonded together in a fixed ratio. This means that the elements lose their individual properties and form a new substance with different properties. Therefore, a compound is different from a homogeneous or heterogeneous mixture, where the elements or substances are not chemically combined and can be separated physically.
10.
Two substances physically combined and that appears the same throughout is classified as:
Correct Answer
A. A homogeneous mixture
Explanation
A homogeneous mixture is a combination of two or more substances that are evenly distributed at a molecular or microscopic level. In this type of mixture, the substances are physically combined and appear the same throughout, with no visible boundaries or separation. This is different from a heterogeneous mixture, where the substances are not evenly distributed and can be seen as separate phases or components. An element is a pure substance that cannot be broken down into simpler substances, while a compound is a substance made up of two or more different elements chemically bonded together.