Periodic Table

Candice conducted an experiment to see if her rose bush plants would grow taller when watered with soda. She planted three rows of rose bushes and poured one can of soda on each plant daily. Each row received a different type of soda - dark, clear, or orange colored. Every Friday, Candice carefully measured and recorded the height of each rose plant. How could Candice improve her experiment?

• plant a different type of rose bush in each row
• move the roses in row #2 into the house
• pour different amounts of solda on each row of roses
• add a row of rose bushes that receive only water

An experiment is repeated one or more times in exactly the same way by a scientist.
What is this called?

• a dependent experiment
• an independent experiment
• a  repeated trial
• a scientific copy

Which metric unit should be used to measure the length of a flea's leg?

• hectometer
• decimeter
• millimeter
• meter

Which is correctly expressed in scientific notation?

• 3, 400 = 3.4  x 10³
• 0.00000576 = 5.76 x 10 ^-10
• 25, 000,000 = 2.5 x 10⁶
• 3, 400=  34 x 10 ²

One of dalton's conclusions concerning his atomic theory was that all atoms of the same element are---

• combined
• the same
• reacted
• different

The positively charged particle in the center of an atom is called the---

• electron
• proton
• quark
• neutron

The electron has a

• negative charge
• neutral charge
• positive  charge
• static charge

Which statement is supported by the atomic theory?

• Atoms combine to make all the substances on Earth.
• Atoms come in different sizes, but most are visible using a simple hand lens.
• Atoms are made up of smaller particles called molecules.
• Atoms are easily destroyed when matter is cooled or heated.

What is the chemical symbol of Hydrogen?

• H
• He
• Hg
• Hf

An atom's mass number is 10 and its atomic number is 6. How many neutrons does  the atom have? 

• 16
• 20
• 4
• 10