Nic bought 12 pens for 2$ each and 12pads of paper for 3$ each. Write two expressions for how nic could calculate his total. Write one expression in expanded form and one in factored form.

A 32 gram radioactive sample has a half-life of 2 days how much of the original sample remains after 6 days

Four identical zinc plates are placed in four different solutions of sulfuric acid (H2SO4). The following reaction occurs: Zn + H2SO4 ZnSO4 + H2 In which concentration of sulfuric acid solution would the reaction occur the fastest? A. 0.16 M H2SO4 B.

What types of mixtures are these? peanuts and almonds mixed together in a bowl food coloring dissolved in water a cup of tea and sugar a bucket full of sand and gravel

An atom of oxygen has eight electrons and wight protons true or false

The lighter elements of Group I and II have distinctly different chemistry from their heavier congeners. For example, Be and Li both have a strong tendency to form polymer-like structures with bridging atoms whereas the heavier elements do not.

Butter is melted in a pan. Which of the following is true about the change? Select one: a. It is a physical change that absorbs energy. b. It is a physical change that releases energy. c.

The freons are a class of compounds containing carbon, chlorine, and fluorine. while they have many valuable uses, they have been shown to be responsible for depletion of the ozone in the upper atmosphere.

Write its complete chemical symbol including mass number, atomic number, and net charge (if any).

How would you be able to use the spectrum of each gas to establish its identity

Which does not add to the reliability of a scientific source of information? displaying data in a colored chart clearly identifying the sources of the data explaining how the data was collected showing that many scientists had reviewed the