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Chemistry

Kaliyah Bolton

Sarah heated some orange coloured crystals in a test tube. The crystals turned green and fizzed. After the fizzing stopped, the test tube was allowed to cool. A green powder was left in the tube. Determine whether a chemical or a physical reaction has occurred. Identify two observations that support your decision.

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Chemistry

Dandy

In which orbital does an electron in a bromine atom experience the greatest effective nuclear charge?

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Chemistry

Elvis Farmer

Kool-Aid is made up of sugar (C6H12O6), food coloring, and water. It is an example of a (n)

element

heterogeneous mixture

homogeneous mixture

compound

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Chemistry

Isla Bruce

A laboratory experiment requires 250 millimeters of water for boiling. It also requires 100 millimeters of water for a cooling process.

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Chemistry

Guest

Which set of procedures and observations indicates a chemical change?

A) Ethanol is added to an empty beaker and the ethanol eventually disappears.

B) A solid is gently heated in a crucible and the solid slowly turns to liquid.

C) Large crystals are crushed with a mortar and pestle and become powder.

D) A cool, shiny metal is added to water in a beaker and rapid bubbling occurs.

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Chemistry

Priscilla Jefferson

If 100 grams citric acid react with 100 g baking soda how many grams of carbon dioxide?

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Chemistry

Guest

What state of matter undergoes changes in volume most easily?

a. solidb. liquidc. gasd. frozen

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Chemistry

Ray Barr

What was the result of the atomic theory?

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Chemistry

Janiah Haynes

Explain mitosis and meiosis in your own words.

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Chemistry

Josephine

What device changes mechanical energy into electrical energy?

Question 4 options:

transformer

generator

copper wire

light switch

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Chemistry

Mira Villarreal

Reaction rates are affected by how often the particles collide

true

false

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Chemistry

Emilio Ortiz

A 25 N and 5 N force pull to the right. Friction is 10 N. If the object is 5 kg, find the net force and acceleration.

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Chemistry

Camille Banks

What properties of matter are intensive independent of their size

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Chemistry

Guest

What is the density of an object having a mass of 8.0g and a volume of 25cm3

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Chemistry

Kody

What is a Cilla? (In drawing)

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