Zinc and sulfurcombine to form zinc sulfide (ZnS) in which type of reaction?

• Synthesis

• decomposition

• single replacement

• double replacement

The light and dark circles in the pictures below represent different types of atoms. Which picture best represents a pure compound?

• 
• 
• 
• 

Tags

NGSS.MS-PS1-1

A student mixes salt and water in a beaker to form a solution. What properties of the substances would allow the student to then separate the components?

• Densities

• particle size

• boiling points

• electrical conductivity

An alpha particle that is emitted as nuclear radiation has the same structure as a

• Hydrogen nucleus

• helium nucleus

• neutron

• electron

Which action will cause sugar to form a new substance?

• Cooking sugar on stove

• dissolving a sugar cube in water

• Pouring sugar through a screen

• crushing sugar cube into pieces

Tags

NGSS.MS-PS1-2

A student added 10 mL of sodium chloride, NaCl, to 100 mL of water and then stirred the mixture until the salt was no longer visible. Which of the following best describes the mixture?

• Sodium chloride is a solute, water is a solvent, and salt is the solution

• Sodium chloride is the solute, salt water is the solvent, and water is the solution

• Water is the solute, sodium chloride is the solvent, and salt water is the solution

• Water is the solute, saltwater is the solvent, and sodium chloride is the solution

The chemical formula for water is H2O. What does the formula show about each element in the compound?

• The number of valence electron

• The charge of the compound

• The mass of the protons in each atom

• The number of atoms of each element

Tags

NGSS.MS-PS1-1

The weight of an object can change even when the mass stays the same. Which statement correctly identifies a relationship between mass and weight?

• The weight of the object depends on the mass and its volume

• Gravity affects the weight of an object but not its mass

• The mass of the object depends on its weight size

• Magnetic fields can affect mass but not weight

Tags

NGSS.MS-PS2-4

The electron dot diagrams of calcium and magnesium are shown. Both elements have the same number of valence electrons. In what other way are these elements the same?

• Both elements have the same atomic mass

• Both elements have the same atomic number

• Both elements are in the same period on the periodic table

• Both elements are in the same group on the periodic table

A 0.20 kg softball travels 97 meters (m) south for 4.5 seconds (s). What piece of information distinguishes the velocity from the speed of the ball?

• The ball went to south

• the ball travelled 97m

• The ball flew for 4.5sec

• the ball has a mass of 0.20 kg