Chemistry Praxis

Students are completing a lab in which they investigate the impact of soil pH on the growth rate of grass. This lab connects which two science disciplines?

• physics and space science

• physics and biology

• chemistry and biology

Answer explanation

This lab illustrates the interconnectedness between soil acidity (chemistry concept) and nutrient availability (biology concept).

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

How many valence electrons does Silicon Have?

• 1 Valence electron

• 2 Valence electron

• 3 Valence electron

• 4 Valence electron

• 5 Valence electron

Tags

NGSS.MS-PS1-1

How many valence electrons does Potassium Have?

• 1 Valence electron

• 2 Valence electron

• 3 Valence electron

• 4 Valence electron

• 5 Valence electron

Tags

NGSS.MS-PS1-1

Which item on this element square is the chemical symbol?

• Copper

• 29

• Cu

• 63.546

Which of these samples shown best represents an element?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-1

Which of the following elements is most likely to form a covalent bond?

• Sodium (Na)

• Chlorine (Cl)

• Argon (Ar)

• Potassium (K)

What is the primary reason for the periodic trends in atomic size across a period?

• Increase in nuclear charge

• Increase in electron shielding

• Decrease in nuclear charge

• Decrease in electron shielding

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following compounds is an example of an ionic compound?

In a chemical reaction, the substance that is completely consumed when the chemical reaction is complete is called the:

• Catalyst

• Reactant

• Limiting reagent

• Excess reagent

Which of the following is a characteristic of a strong acid?

• High pH

• Low pH

• Neutral pH

• Variable pH