Period 4 Quiz 10/20/23

Which of the following is classified as a pure substance?

• Lemonade

• Fruit punch

• ketchup

• Hydrogen

Answer explanation

A pure substance is a material that has a constant composition and cannot be separated into its components by physical means. Among the given options, lemonade, fruit punch, and ketchup are mixtures, while hydrogen is an element and a pure substance. Therefore, hydrogen is classified as a pure substance.

Substances that are made up of ONLY one type of atom (element) or compound.

• Heterogeneous mixture

• Pure substance

• Suspension

• Homogeneous mixture

Answer explanation

A pure substance is made up of only one type of atom (element) or compound, as mentioned in the question. Heterogeneous and homogeneous mixtures consist of multiple substances, while suspensions are a type of heterogeneous mixture. Therefore, the correct choice is a pure substance.

What is matter?

• Anything that has mass and occupies space

• Anything that has mass

• Anything that is made of air

• ALL of them 

Answer explanation

Matter is defined as anything that has mass and occupies space. This means it has a physical presence and can be weighed. The other options, such as having mass alone or being made of air, do not fully encompass the definition of matter. Therefore, the correct choice is 'Anything that has mass and occupies space'.

Tags

NGSS.MS-PS1-5

Which of the following is NOT a mixture?

• milk

• lemonade

• vegetable salad

• carbon

Answer explanation

The question asks which option is NOT a mixture. A mixture is a combination of two or more substances that are not chemically combined. Milk, lemonade, and vegetable salad are all mixtures, as they consist of multiple substances. Carbon, however, is an element and not a mixture, making it the correct choice.

Which of these is an element?

• Salt (NaCl)

• Water (H20)

• Oxygen (O)

• Carbon Dioxide (CO2)

Answer explanation

An element is a substance that cannot be broken down into simpler substances by chemical means. Among the given options, Oxygen (O) is an element, while Salt (NaCl), Water (H2O), and Carbon Dioxide (CO2) are compounds composed of two or more elements chemically combined.

Which of these is a compound?

• Aluminium (Al)

• Carbon Dioxide (CO2)

• Nitrogen (N)

• Sand

Answer explanation

A compound is a substance formed when two or more elements are chemically bonded together. Among the given options, Carbon Dioxide (CO2) is a compound as it consists of one carbon atom and two oxygen atoms bonded together. The other options, Aluminium (Al) and Nitrogen (N), are elements, while sand is a mixture of compounds and elements.

Tags

NGSS.MS-PS1-1

True or False: Elements and compounds are pure substances.

• True

• False

Answer explanation

True is the correct answer. Elements and compounds are both considered pure substances because they cannot be separated into simpler substances by physical means. Elements consist of only one type of atom, while compounds are made up of two or more different elements chemically bonded together.

Identify which images are HETEROGENEOUS MIXTURES! (Check all that apply)

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Solutions are ___________ mixtures.

• Solid

• Homogenous

• Heterogeneous

• Gas

Answer explanation

Solutions are homogenous mixtures because their components are uniformly distributed throughout the mixture. In a homogenous mixture, the composition is consistent, and the individual components cannot be easily distinguished. This is in contrast to heterogeneous mixtures, where the components are not uniformly distributed and can be easily separated.

What are the two types of Mixtures

• Elements and Subatomic Particles

• Protons and Electrons

• Atoms and Compounds

• Homogenous and Heterogeneous

Answer explanation

The two types of mixtures are Homogenous and Heterogeneous. Homogenous mixtures have a uniform composition throughout, while heterogeneous mixtures have visibly different components. The other options, such as elements, subatomic particles, protons, electrons, atoms, and compounds, are not types of mixtures but rather components of matter.