definitions
something that has weight and volume
What is matter?
0.00056 in scientific notation
What is 5.6 x 10-4?
mega, M represents this number (# or exponent) times a base unit
What is 1,000,000 or 106?
the answer in the correct amout of sig figs: 4.52 + 1.3 =
What is 5.8?
This element makes up about 78% of Earth's atmosphere and is essential for proteins and DNA.
What is nitrogen?
these examples represent what kind of change: cutting wood, melting ice, dissolving sugar in water
What is a physical change?
6.32 x 108 in decimal form
What is 632,000,000?
this prefix represents one thousandth 1/1000 of a base unit, meaning 1000 of these equal one base unit
What is m, milli-?
the answer in the correct amout of sig figs: 6.25 x 3.4 =
What is 21?
This element is the most abundant element in the human body by mass.
What is oxygen?
these are examples of what: carbon dioxide CO2, sodium chloride NaCl, glucose C6H12O6
What is a compound?
0.000000728 in scientific notation
What is 7.28 x 10-7?
the correct order largest to smallest: microgram, gram, kilogram, milligram, and decigram
What is kilogram > gram > decigram > milligram > microgram?
the answer in the correct amout of sig figs: (4.56 x 2.1) + 3.27 =
What is 12.8?
4.56 x 2.1 = 9.6, 9.6 + 3.27 = 12.87 --> 12.8
This is the reason a cut onion can make you cry: cutting the onion triggers a this that produces an irritating compound that reaches your eyes.
What is a chemical reaction?
air, vinegar, and salt water are all this type of mixture
What is a homogenous mixture?
spot the error:10700000 = 10.7 x 106
What is 1.07 x 107?
this exponent times a base unit represents centi
What is 10-2?
the answer in the correct amout of sig figs: (12.36 + 4.2)(3.45)/2.10 =
What is 27.2?
12.36 + 4.2=16.6, then 16.6 × 3.45 ÷ 2.10 = 27.271, which rounds to 27.2
This metal is liquid at room temperature and was once commonly used in thermometers. Its chemical symbol comes from its Latin name, hydrargyrum.
What is mercury?
trail mix, oil + water, and salad are this type of mixture
What is a heterogenous mixture?
a red blood cell has a diameter of 0.0000075 m - in scientific notation it is this
What is 7.5 x 10-6?
this prefix and abbreviation are paired with 1/1,000,000,000 and 10-9
What is n, nano?
0.0045 has this many sig figs because of this rule
What is 2 sig figs because LEADING zeros do not count?
what about trailing? trapped?
This element is so reactive with water that it can produce enough heat to ignite the hydrogen gas released during the reaction. It is also one of the few elements that can float on water because of its low density. It is also known to be high in bananas.
What is potassium?