When Mendeleev started his work on organizing the elements, about how many had

been discovered?

about 10

well over 100

about 60

the same as today

Look up the diameters for lithium, sodium, potassium, and cesium atoms. what is the relationship between the atomic number of the element, and the diameter of its atoms? answer

28 Which of the following compounds contains a transition metal? A. magnesium bromide (MgBr2) B. sodium chloride (NaCl) C. potassium hydride (KH) D. iron oxide (FeO)

Which statement about the offspring is correct? answer; 50% will be heterozgous, 50% will be dominant, and 0% would be homozygous recessive

How many grams of KOH are dissolved in 2.50 liters of 1.50 M KOH? (The molar mass of KOH = 56.11 g/mol) 210 grams 93.5 grams 15.0 grams 56.11 grams

How many grams of magnesium are consumed to produce 35.2 liters of mgO

Which substance is the oxidizing agent in this reaction? 2CuO+C→2Cu+CO2 Express your answer as a chemical formula.

Why does the light bulbs have to be part of the loop in order for it to be succesful?

Which best describes the transition from gas to liquid? Energy must be removed because particles in liquid move more slowly. Energy must be added because particles in liquid move more quickly.

Calculate the mass of a 0.255-ml sample of a liquid with density 0.660 g/ml.

Which statement correctly describes the interaction between magnetic poles? North and south poles attract each other. North and south poles repel each other. Two north poles will attract each other. Two south poles will attract each other.