A block of aluminum occupies a volume of 15.0 mL and weighs 40.5 g. What is its density?
What is 8.1g/mL
100
A certain element exists as three different isotopes, 24.1% of all the isotopes have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 22.2% have a mass of 75.20 amu. What is the average atomic mass of this element?
What is 71.16amu.
100
____________ is the considered the father of modern chemistry.
What is Antoine Laviosier.
100
There are ______ periods on the periodic table.
What is seven.
100
To dispose of chemicals you should __________
What is follow the instructions from your teacher or use the designated waste container.
200
Mercury metal is poured into a graduated cylinder that holds exactly 22.5 mL. The mercury used to fill the cylinder weighs 306.0 g. From this information, calculate the density of mercury.
What is 13.6g/mL
200
If element X consists of 78.7% of atoms with a mass of 24.0 amu, 10. 1% of atoms with a mass of 25.0 amu. and 11.2% of atoms with a mass of 26.0 amu. what is the
average atomic mass of element X?
What is 24.332amu
200
Robert Milikan is well known for ___________
What is identifying the negative one charge for electrons.
200
There are _____ groups on the periodic table
What is 18.
200
If you injure yourself or others, you should _____________.
What is inform your teacher immediately.
300
What is the weight of the ethyl alcohol that exactly fills a 200.0 mL container? The density of ethyl alcohol is 0.789 g/mL.
What is 157.8g
300
If element X consists of 92.0% of atoms with a mass of 28.0 amu. each. 5.0% of atoms with a mass of 29.0 amu. each, and 3.0% of atoms with a mass of 30.0 amu. each.
What is the average atomic mass of element X?
What is 28.11amu
300
_____________ stated that atoms were indestructible and indivisible but could not prove it.
What is Democritus.
300
Approximately 75% of the periodic table is made up of _____.
What is metals.
300
Flammable materials should never be dispensed or used near _________
What is flame or heat source.
400
A rectangular block of copper metal weighs 1896 g. The dimensions of the block are 8.4 cm by 5.5 cm by 4.6 cm. From this data, what is the density of copper?
What is 8.92g/cm3
400
If element X consists of 60.4% of atoms with a mass of 68.9 amu. each and has atoms with a mass of 70.9 amu. each. What is the atomic mass of element X?
What is 69.70amu.
400
James Chadwick is responsible for the findings of __________.
What is neutrons.
400
Group 18 is called ___________.
What is noble gases.
400
What is the proper way to use a pipette?
What is using a rubber bulb or pump, not by mouth.
500
A flask that weighs 345.8 g is filled with 225 mL of carbon tetrachloride. The weight of the flask and carbon tetrachloride is found to be 703.55 g. From this information, calculate the density of carbon tetrachloride.
What is 1.59g/mL
500
What is the average atomic mass of element Y if Y consists of atoms with a mass of 120.90 amu. and 42.75% of atoms with a mass of 122.90 amu?
What is 121.76amu.
500
____________ stated that atoms were mostly made up of empty space with neutrons and protons inside of the nucleus. Electrons surrounded the outside of the nucleus.
What is Rutherford.
500
Elements within the same groups have similar _____________.
What is chemical and physical properties.
500
When mixing acid and water, you should pour __________into _______.