ZnCl2 + H2 Which is the correct balanced chemical equation?,When does an electric discharge occur?">






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Chapter 1 Chapter 2 Chapter 3 Chapter 4
100
Moving the material to a location where the temperature is lower.
Which would decrease a material's thermal energy?
100
Group 3 - 4 - 5 - 6 - 7
Or Column 13 - 14 - 15 - 16 - 17
Which group of elements on the periodic table forms covalent compounds with other nonmetals?
100
Zn + 2HCl --> ZnCl2 + H2
The chemical equation :
Zn + HCl --> ZnCl2 + H2
Which is the correct balanced chemical equation?
100
When an unbalanced electric charges become balanced.
When does an electric discharge occur?
200
Thermal expansion
Which term describes what happens to a cold balloon when placed in a hot car?
200
Metals with metals.
Which types of atoms pool their valence electrons to form a "sea of electrons"?
200
It is the same.
Iron combines with oxygen gas and forms rust. the Compare the total mass of the products with the mass of the reactants.
200
In a parallel circuit.
There are two lightbulbs in Fatema's garage, when she turns off the light switch, only one lightbulb goes dark. How are the lightbulbs connected?
300
40 C.
If water in a bath is at 104 F, then what is the temperature of water in degrees Celsius?
300
He (Helium) and Ar (Argon) are two atoms that have something in common. Explain what's that by showing your work.
300
Decomposition.
Synthesis.
4KNO3 --> 2K2O + 2N2 + 5O2
What is the type of this reaction?
What type of reaction is the reverse reaction?
300
A light bulb is an electric device, a battery is a source of electric energy, and the wires are electric conductors.
A circuit contains a light bulb, a battery, and wires. Name these components using their function.
400
The steel spoon.
A spoon made of aluminum and a spoon made of steel have the same mass. The aluminum spoon has a higher specific heat than the steel spoon. Which spoon becomes hotter more quickly when placed in a pan of boiling water?
400
Losing two electrons.
What change would make an atom with 2 electrons on its 1st shell and 2 valence electrons on its second have the same electron arrangement as a noble gas?
400
Comparing the chemical properties of the starting substances and ending substances + the signs of the presence of a chemical reaction.
How can you verify that a chemical reaction has occurred?
400
7.5 V
Four identical lightbulbs are connected in series to a 30-V battery. What is the voltage across each lamp?
500
Conduction is the transfer of thermal energy through the collisions between the particles of materials. In gas, the particles are further apart than the liquid and the solid, that is why it takes more time.
Why is conduction slower in gas than in a liquid or a solid?
500
Because oxygen has 6 valence electrons and needs to share two electrons to because stable, so it can share two pairs of electrons with another atom, while the chlorine has 7 valence electrons and needs to share 1 electron to become stable, so it can only share one pair of electrons with another atom.
Why is it possible for an oxygen atom to form a double covalent bond, but it is not for a chlorine atom? (HELP YOURSELF BY DRAWING THE ELECTRON DOT DIAGRAM)
500
CH4 + 2O2 --> CO2 + 2H2O
Which equation shows that atoms are conserved in the reaction?
CH4 + O2 --> CO2 + H2O
2CH4 + O2 --> 2CO2 + H2O
CH4 + 2O2 --> CO2 + 2H2O
500
An anion gains one or more electrons. So it becomes a negative ion because gaining electrons, the amount of negative particles (electrons) becomes higher than the amount of positive particles (protons).
A particle called an anion forms when an electrically neutral atom gains or loses electrons.
What kind of charge does an anion have? Explain your answer.






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