Beginning-of-Year Science Assessment Pt. 1

Front

What is a valence electron?

Back

A valence electron is an electron that is located in the outermost shell of an atom and can participate in forming chemical bonds.

Front

Why do sodium and lithium have similar chemical properties?

Back

Both sodium and lithium have one valence electron, which gives them similar reactivity.

Front

What is an invasive species?

Back

An invasive species is a non-native species that spreads widely in a new habitat, often outcompeting native species for resources.

Front

How can farmers improve water quality in nearby streams and lakes?

Back

Farmers can improve water quality by planting crops that need less fertilizer, reducing runoff of harmful chemicals.

Front

What happens to native grasses when an invasive species like buffelgrass is introduced?

Back

The population of native grasses will likely decrease due to competition for space and resources.

Front

What is the role of fertilizers in agriculture?

Back

Fertilizers provide essential nutrients to crops, but excessive use can lead to water pollution.

Front

What is the significance of energy levels in an atom?

Back

Energy levels determine the distribution of electrons around the nucleus and influence an atom's chemical properties.

Front

What is the relationship between protons and electrons in a neutral atom?

Back

In a neutral atom, the number of protons equals the number of electrons, balancing the overall charge.

Front

How does competition affect ecosystems?

Back

Competition can lead to the decline of certain species, especially if one species is more efficient at utilizing resources.

Front

What is the impact of reduced fertilizer use on the environment?

Back

Reduced fertilizer use can lead to improved water quality and healthier ecosystems by minimizing nutrient runoff.