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Chemistry

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Vilma Hirthe

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Cards in this guide (11)
What is the photoelectric effect

Apexvs.

Electrons are knocked off atoms, causing electricity to flow.

How many elements were there in 1860

63 elements had been discovered so far.

What is a reason an engineer may choose to use a prefabricated building component

She wants to use standard materials to minimize negtive environmental impacts

What law states that energy is never created or destroyed

The law of conservation of energy

What does adding a neutron to an atoms nucleus do to the atoms mass

we can not add neutron

Are elements arranged in in a periodic table or an element table

The elements are arranged in a periodic table. Refer to the related link for a printable periodic table.

What makes up nearly all of the atom's mass

The nucleolus.

An atom of aluminum (Al) has an atomic number of 13 and a mass number of 27. How many neutrons does it have

14

Chlorine (Cl) has an atomic number of 17. It often forms an ion by gaining 1 electron. What would its charge be

-1

Na-23 has 12 neutrons what is its atomic number

11

An engineer chooses to use a composite material that incorporates concrete and recycled glass for the floors of a new building. This is an example of

Green design

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