Ch.2_Atoms_molecules_ions

Daniel, Mason, and Scarlett are studying atomic structures in their chemistry class. Their teacher shows them an atomic structure and asks, 'Which of the following statements is/are correct for the atomic structure shown here?'

• The element is carbon.

• There are six protons.

• There are six neutrons.

• The atomic number of this element is 6.

• All of the above.

Tags

NGSS.MS-PS1-1

Harper, Priya, and Ethan are discussing the nature of atoms during their science project. Harper says that an atom is the smallest part of an element. Priya thinks it's the smallest part of a compound, and Ethan believes it's the smallest part of a mixture. Another friend suggests that an atom consists of only protons and neutrons. Who is correct?

• Harper

• Priya

• Ethan

• Their other friend

• All of them

James, Anika, and Isla are studying for their chemistry exam. They are discussing atomic particles. They all agree on the following statements except one. Which statement is false?

• Electrons are negatively charged particles.

• Protons are positively charged particles.

• Neutrons are chargeless (neutral).

• Electrons and protons are located in the nucleus.

• Number of protons in an atom gives the identity of element.

Jackson, Priya, and Arjun are studying chemistry together. They come across an isotope of an element and want to calculate the number of neutrons in it. What is the correct formula they should use?

• A - Z

• A + Z

• Z - A

• None of the above.

Tags

NGSS.HS-PS1-8

In a chemistry class, Aiden learned that an oxygen atom usually forms an ion. He was confused about the exact ion it forms. Can you help Aiden identify the correct ion? (a)  

Evelyn, Aiden, and Abigail are working on a science project about elements. They are trying to find out the atomic weight of nitrogen in amu (atomic mass unit). Can you help them?

• 7

• 14

• 21

• 12

• 15

Abigail, Zoe, and Mason are working on a science project about greenhouse gases. They are particularly interested in CO₂. Can you help them figure out the molecular weight of CO₂ in amu (atomic mass unit)?

Hint. Atomic masses (amu): C 12.01 and O 16.00

• 12.01

• 16.00

• 44.01

• 28.01

During a science experiment, Nora, Isla, and Charlotte came across a compound with the formula NaCl. What is the name of this compound?

Isla, Daniel, and Noah were conducting a science experiment in their school. They were tasked with identifying the chemical formula of the gas they produced by mixing vinegar and baking soda. They found out that the gas was Carbon dioxide. Can you help them confirm the chemical formula of Carbon dioxide molecule?

​ ​ (a)  

• CO

James is learning about chemical compounds in his chemistry class. His teacher asked him about the formula of a compound formed from Ca²⁺ and Cl^-. Can you help James answer this? (a)  

• CaCl

Tags

NGSS.MS-PS1-1