1st 9 Weeks Exam Review

Which of these elements is a highly reactive metal that is not a good conductor of heat or electricity?

• Calcium (Ca)

• Aluminum (Al)

• Silicon (Si)

• Nickel (Ni)

How many neutrons does the second element have?

• 12

• 11

• 10

• 9

Tags

NGSS.MS-PS1-1

An element is a solid with a metallic-gray appearance. It has 1-2 valence electrons, and is a great conductor of heat and electricity. It is not as reactive as other elements. In which section of the periodic table above would the element most likely be found?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

What types of particles are found in the cloud surrounding the atom’s nucleus?

• Positively charged particles and negatively charged particles

• Negatively charged particles only

• Neutral particles and positively charged particles

• Positively charged particles only

Tags

NGSS.MS-PS1-1

For an investigation a student poured a blue solution of CuSO₄ into a beaker. The student placed a shiny, silver-colored strip of zinc metal in the solution and observed the changes. Which of the following describes a chemical change was observed?

• a dark solid formed on the zinc metal

• the zinc metal remained silver-colored and shiny

• the CuSO₄ solution turned blue when the zinc metal was added

• none of these

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What safety equipment should be worn when conducting an investigation to determine how unbalanced forces affect the speed and/or direction of an object?

• A. goggles and closed-toe shoes

• B. goggles and gloves

• C. gloves and closed-toe shoes

• D. goggles, gloves, and closed-toe shoes

If something at your lab station catches on fire, what is the best response from the choices below?

• A. always run for the fire extinguisher if you see a flame

• B. if and only is it is possible to do so safely, cover the flames with a beaker or watch-glass, remove the solvents form the area, then get the fire extinguisher; if it's not possible to do this, leave the room and pull the fire alarm, and call 911 from a safe phone

• C. poor water on the flames

• D. the moment you see a hint of a flame, immediately leave the room and pull the fire alarm

Which of these best describes one of the subatomic particles that could be found at location X in the model of an atom shown above?

• A. It has mass but no charge.

• B. It has no mass and a positive charge.

• C. It has a large mass and a negative charge.

• D. It has no mass and an equal number of positive and negative charges.

Tags

NGSS.MS-PS1-1

Which of the formulas above contain equal numbers of nitrogen atoms?

• F. Formulas I and III

• G. Formulas I and V

• H. Formulas II and III

• J. Formulas I, II, and V

Tags

NGSS.MS-PS1-1

If your clothing or your partners clothing catches fire, what should you do?

• F. drop to the floor and roll to extinguish the fire

• G. run

• H. spray the fire with a fire extinguisher

• J. throw water on the burning clothes