A substance that cannot be separated into simpler substances by physical or chemical means is a(n)
A chemical combination of two or more different elements is a(n)
Which of the following is an example of an element?
Which of the following is an example of a compound?
What are the horizontal rows in the periodic table called?
What are the vertical columns in the periodic table called?
Identify each substance as either an element or a compound.
silicon
nickel
neptunium
tungsten
sodium chloride
francium
carbon dioxide
ice
borax
Element
Compound
Write the symbol for each element. Use correct upper and lower case letters.
neon
Write the symbol for each element. Use correct upper and lower case letters.
calcium
Write the symbol for each element. Use correct upper and lower case letters.
radon
Write the symbol for each element. Use correct upper and lower case letters.
Flerovium
Write the symbol for each element. Use correct upper and lower case letters.
Dubnium
Write the symbol for each element. Use correct upper and lower case letters.
Mercury
Write the symbol for each element. Use correct upper and lower case letters.
Moscovium
Use the law of definite proportions and the equation below to answer the questions. The law of definite proportions states that regardless of the amount, a compound is always composed of the same elements in the same proportion by mass.
Mass percentage of an element (%) = mass of element/mass of compound x 100.
A 20.0-g sample of sucrose contains 8.4 g of carbon. What is the mass percentage of carbon in sucrose? Show your work.
Use the law of definite proportions and the equation below to answer the questions. The law of definite proportions states that regardless of the amount, a compound is always composed of the same elements in the same proportion by mass.
Mass percentage of an element (%) = mass of element/mass of compound x 100.
Sucrose is 51.50% oxygen. How many grams of oxygen are in 20.0 g of sucrose? Show your work.
Use the law of definite proportions and the equation below to answer the questions. The law of definite proportions states that regardless of the amount, a compound is always composed of the same elements in the same proportion by mass.
Mass percentage of an element (%) = mass of element/mass of compound x 100.
A 2-g sample of sucrose is 6.50% hydrogen. What is the mass of hydrogen in 300. g of sucrose? Explain your reasoning.