8th Grade Second Six Weeks Review 2024-25

Which of these atoms has the MOST mass?

• indium

• tin

• yttrium

• iodine

The instructions for a lab warned students to avoid putting Na in the liquid used during the experiment. What element should not be placed in the liquid?

• A nitrogen

• B phosphorus

• C sodium

• D silicon

During a game, students were asked to select the correct symbol with the element. All of the following answers would be correct EXCEPT —

• A Na — sodium

• B H — helium

• C O — oxygen

• D C — carbon

What element is represented in this model if the atomic number is 3?

• lithium

• carbon

• nitrogen

• neon

Tags

NGSS.MS-PS1-1

In the Bohr model of an atom, protons are represented in blue, the neutrons are red and the electrons are green. Use your periodic table and determine which of the following atoms is represented by the Bohr model.

• Magnesium

• Calcium

• Aluminum

• Sodium

Tags

NGSS.MS-PS1-1

Plants perform a chemical reaction known as photosynthesis in which light energy is converted into chemical energy in the form of sugars. The chemical equation for photosynthesis is displayed. Which statements accurately describe the chemical reaction process that plants undergo? Select TWO correct answers.

• No new substances are produced during the process of photosynthesis since it is a chemical reaction.

• There are more carbon (C) atoms on the products side of the equation than there are on the reactants side.

• A new substance is produced during photosynthesis because photosynthesis is a chemical reaction.

• There are fewer hydrogen (H) atoms on the products side of the equation than there are on the reactants side.

• The number of oxygen (O) atoms is the same on the reactants and products side of the chemical reaction.

Tags

NGSS.MS-PS1-5

NGSS.MS-LS1-6

A student creates a mixture of water and washing soda weighing 10 g and a mixture of water and epsom salts weighing 15 grams. He knows that when he mixes the two substances a chemical change will occur. According to the law of conservation of mass, what should the weight of the products be after he mixes them?

• 10g

• 15g

• 5g

• 25g

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

The Law of Conservation of Mass states-

• That in order to conserve mass we should always recycle our waste.

• That conservation efforts are the only way to preserve the mass that exists in natural habitats.

• That the mass in chemical reactions cannot be created nor destroyed, just rearranged.

• That you should use only the minimum amount of chemicals necessary in a chemical reaction in order to conserve your supply of that chemical.

Tags

NGSS.MS-PS1-5

Which of the following is correct?

• reactants ← products

• reactants products

• reactants → products

• reactants = products

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

6CO₂ + 6H₂O + Sunlight → C₆H₁₂O₆ + 6O₂ In the above formula, how many atoms of Carbon are on the product side of the equation?

• 6

• 2

• 13

• 12

Tags

NGSS.MS-PS1-5

NGSS.MS-LS1-6