Module 1 Assessment

What is the chemical formula for methane?

• CH₄

• CO₂

• H₂O

• O₂

Answer explanation

The chemical formula for methane is CH₄, which indicates it consists of one carbon atom and four hydrogen atoms. The other options represent different compounds: CO₂ is carbon dioxide, H₂O is water, and O₂ is oxygen.

Which molecule is a product of the combustion of methane?

• Methane (CH₄)

• Oxygen (O₂)

• Water (H₂O)

• Helium (He)

Answer explanation

The combustion of methane (CH4) primarily produces carbon dioxide (CO2) and water (H2O). Therefore, water (H2O) is a correct product of this reaction, making it the right choice among the options.

What is the role of oxygen in the combustion of methane?

• It is a product.

• It is a reactant.

• It is a catalyst.

• It is an inhibitor.

Answer explanation

Oxygen is essential for the combustion of methane, as it reacts with methane (CH4) to produce carbon dioxide (CO2) and water (H2O). Therefore, oxygen is a reactant in this chemical reaction.

Which fuel source, gasoline or diesel, would produce the most carbon dioxide when it combusts?

• Gasoline

• Diesel

• Both produce the same amount

• Neither produce carbon dioxide

Answer explanation

Diesel produces more carbon dioxide when combusted compared to gasoline due to its higher carbon content and energy density. Therefore, the correct answer is diesel.

Tags

NGSS.HS-ESS2-6

NGSS.HS-PS1-4

How many bonds can the element NITROGEN make?

• 1

• 3

• 4

• 2

Answer explanation

Nitrogen has five valence electrons and can form three covalent bonds by sharing three of these electrons. This allows it to achieve a stable electron configuration, making the correct answer 3.

Tags

NGSS.HS-PS1-1

How many bonds can the element Magnesium make?

• 1

• 2

• 4

• 6

Answer explanation

Magnesium has 2 valence electrons and can form 6 bonds by sharing or transferring these electrons with other elements, allowing it to achieve a stable electron configuration.

Tags

NGSS.HS-PS1-1

Here is the chemical equation for the combustion of methane. Why is it that Oxygen gas molecules CANNOT form any other way? HINT: Talk about bonds.

• Oxygen gas can exist as O3 due to single bonds between atoms.

• Oxygen gas molecules can only form as O2 due to the need for double bonds between oxygen atoms for stability.

• Actually, Oxygen gas can form with just one bond

• Oxygen molecules can form as O2 and O4 because of triple bonds.

Answer explanation

Oxygen gas (O2) forms due to the need for double bonds between oxygen atoms, which provide stability. O3 (ozone) exists but is less stable, while O4 is not a common or stable form. Thus, O2 is the primary stable form.

Tags

NGSS.HS-PS1-2

Here is the chemical equation for the combustion of methane. Why is it that Methane molecules CANNOT form any other way? HINT: Talk about bonds.

• This is not true - Methane molecules can exist without any bonds at all.

• A carbon atom can bond 4 times, and hydrogen can bond 1 time

• Methane can form through ionic bonds between carbon and hydrogen.

• Methane can be formed by mixing carbon and oxygen without any bonds.

Answer explanation

A carbon atom can form four covalent bonds, while hydrogen can form one. This bonding capability is essential for the formation of methane (CH4), as it allows one carbon atom to bond with four hydrogen atoms, creating a stable molecule.

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-4

Combustion-powered (e.g., gas and diesel) cars are contributing to human-caused

climate change. Use evidence from your experiences in class and your background knowledge to support the claim. Be sure to clearly state your reasoning for why the evidence supports the claim. 3+ sentences.

Answer explanation

Combustion-powered cars emit greenhouse gases like CO2, which trap heat in the atmosphere. This contributes to global warming, as evidenced by rising temperatures and extreme weather patterns linked to increased fossil fuel use.

Tags

NGSS.HS-ESS3-1

As we move from left to right on the periodic table, the electrons...

• increase by one proton

• decrease by one electron

• remain the same

• increase by one neutron

Answer explanation

As we move from left to right on the periodic table, each element has one more proton in its nucleus, which also means it has one more electron to maintain electrical neutrality. Thus, the correct answer is that electrons increase by one proton.

Tags

NGSS.HS-PS1-1