Is this reaction endothermic or exothermic?
C2 + O2 --> CO2 + Heat
Endothermic
100
A scientist created a chemical reaction with 6 grams of one reactant and 13 grams of another. The reactants should weigh:
a) Less than 13 grams
b) Less than 19 grams
c) At least 13 grams
d) Exactly 19 grams
More than 19 grams
d. Exactly 19 grams
200
Electron have a ___________ charge.
Negative
200
Draw the domains in a magnetized nail.
All domains pointing in the same direction.
200
Draw a Bohr model for Hydrogen.
H
200
What are the reactants in this equation?
C2 + O2 --> CO2 + Heat
C2 + O2
200
Which of the following best describes an atom?
A) protons and electrons grouped together in a random pattern
B) protons and electrons grouped together in an alternating pattern
C) a core of protons and neutrons surrounded by electrons
D) a core of electrons and neutrons surrounded by protons
C) a core of protons and neutrons surrounded by electrons
300
_________ and ________ are located in the nucleus.
Protons and Neutrons
300
List TWO differences between a bar magnet and an electromagnet.
1) Electromagnets can be turned on/off
2) Electromagnets poles can be switched.
3) Electromagnets power can be changed.
300
Draw a Bohr model for Nitrogen.
N.
300
What does the "C" stand for in the thermal energy equation?What are the units for C?
Specific Heat Capacity, J/gC
300
The ATOMIC NUMBER tells us the number of ________________ and _____________ in an Atom.
Protons and Electrons
400
Describe the location of electrons in the atom.
On the outside of the atom in the electron cloud
400
What three components are essential for an electrical circuit?
Power source, power receiver, power pathway.
400
How many protons, electrons and neutrons does Aluminum have. Also, draw the Bohr model.
13 E, 14 N, 13 P
400
Calcualte the Thermal energy for the following:
45 g of Liquid Nitrogen was heated from 80°C to 15°C. How much energy was used to heat Nitrogen (N)? Heat Capacity of Nitrogen is 0.11 J /g C
321.75 Joules
400
How do you get the number of dots around a Lewis Dot Structure?
By counting the VALENCE ELECTRONS – the outermost electrons- on a Bohr Model
500
What is the name of the electrons that are farthest from the nucleus.
Valence Electrons
500
Draw a complete electrical circuit.
Drawing.
500
Draw the Lewis dot structure for Chlorine and indicate the number of protons, neutrons and electrons.
17 P, 17 E, 18 N
500
Gold, with a heat capacity of 0.13 J/gC, was heated and melted into a ring. A total of 450 Joules was used to heat the 30 gram piece of gold. What is the temperature change?
115.38 Celsius
500
When magnesium (Mg) metal is burned in the presence of oxygen (O), magnesium oxide (MgO) is produced. The properties of magnesium oxide are different than the individual properties of magnesium and oxygen because magnesium oxide is...
a) solution
b) a mixture
c) a compound
d) an element