Author: Anonymous

What is the name of the element that has a mass very close to two times the mass of an average atom of nitrogen (#7)

Anything that has mass and occupies volume is called ____.

How many protons, neutrons and electrons are there in an atom that has an atomic number of 54 and a mass number of 129? [protons], [neutrons], [electrons] What is the symbol for the element? [symbol]

The following statements describe some physical and chemical properties of sucrose (table sugar). Which response includes all that describe CHEMICAL properties, and none that describe physical properties?   a. it is a colorless solid b. it produces a black substance and gives off vapors when mixed with sulfuric acid c. it ignites and burns with a yellow flame when heated strongly d. its density is 1.6 g/mL e. it is usually in the form of small crystals although it can also occur as a powder  

Use whichever of the following equations necessary to convert 253 K to Fahrenheit.(Use only these equations – decimal answers will not be accepted)  °C = 5/9 (°F – 32)  °F = 9/5 (°C) + 32 °C = K – 273  

How many electrons are present in a SINGLE chlorine atom with a mass number of 35? 

How many electrons are present in a SINGLE fluorine atom with a mass number of 15?

What would you multiply atoms of scandium (Sc) by to get the units moles of scandium?

Which response lists all the substances below that are mixtures and not any pure substances? a. oxygen b. wine c. baking soda (NaHCO3) d. soil e. Cu

Which one of the following lists units of volume in decreasing order (from largest to smallest)?