L3 🧠 Elements and Compounds

An element can be broken down further

• True
• Elements are indivisible
• False

The vertical columns on the periodic table are called what

• Periods
• Rows
• Groups
• Sections

explain the difference between Compound and elements

Tags

NGSS.MS-PS1-1

Which of the following is true of elements

• All elements are naturally existing.

• An element is a pure substance that cannot be separated into simpler substances by physical or chemical means.

• Water is an element

• Different sets of elements share similar physical properties, but they never share chemical properties.

How are elements in the periodic table organized

• They are not organized in any particular pattern

• They are organized alphabetically by their chemical symbols.

• They are organized into horizontal rows called periods and vertical columns called groups.

• They are organized into horizontal rows called groups and vertical columns called periods.

Which of the following is not a compound

• Water

• Potassium Iodide

• Sodium chloride

• Hydrogen

Tags

NGSS.MS-PS1-1

Which of the following is true of electrolysis?

• It causes the chemical change of water into its component elements.

• It uses heat to break down a compound

• It causes the physical change of water into its component elements.

• It separates water into one part hydrogen and one part oxygen.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Copper(I) chloride and copper(II) chloride are both formed by the combination of copper and chlorine. The different masses of copper that combine with a fixed mass of chlorine in the two different compounds can be expressed as a small whole-number ratio. This ratio supports which law?

• the law of conservation of mass

• the law of multiple proportions

• the periodic law

• the law of definite proportions

Tags

NGSS.HS-PS1-7