.:Chemical Reactions:.

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Which of these is the correct balanced equation for the reaction between potassium and water?

2K(s) + 2H2O(l) → 2KOH(aq) + H2(g)

Look at this unbalanced symbol equation: Na + H20 → NaOH + H2. Which of these is the correct balanced equation?

2Na + 2H2O → 2NaOH + H2

Az

Alka Seltzer

Which halogen is a liquid at room temperature?

Bromine

C

Carbon

Co2

Carbon Dioxide

C3O3

Carbon Monoxide

Bubbles form

Chemical change

Change in color

Chemical change

Solid forms from 2 liquids mixing

Chemical change

Cr

Chromium

Cr2O3

Chromium Dioxide

Cl

Clorhide

Mixing baking soda and vinegar is an example of an endothermic reaction. If you were holding a beaker while this chemical reaction took place, then you would expect it to feel _______ after the reaction was complete.

Colder

Heat is a form of what?

Energy

Which of the following correctly describes changes in energy during a chemical reaction?

Energy may be either absorbed or released during a reaction

Cellular respiration is an example of a chemical reaction where energy is released. Which of the following is a reaction where energy is released?

Exothermic reaction

Iron and chlorine gas reacts to form Iron chloride

Fe +Cl2 → FeCl3

Which is a product in this equation? 6CO2 + 6H2O —> C6H12O6 + 6O2.

Glucose

What is the formula for a molecule of hydrogen?

H2

Density

How much matter is in matter

H

Hydrogen

What gas is always produced when a group 1 metal reacts with water?

Hydrogen

2H2s

Hydrogen Sulfide

Fe

Iron

What is the formula for potassium hydroxide?

KOH

What is the formula of the alkali produced when lithium reacts with water?

LiOH

What is the formula for sodium bromide?

NaBr

O

Oxygen

Ag

Silver

Ag2S

Silver Sulfide

Ag2s

Silver Sulfide

S

Sulfur

When a color change happens, a chemical reaction must have occurred.

True

+

Used to separate multiple reactants or products

H2O

Water

Zn

Zinc

Exothermic

accompanied by the release of heat. (hotter)

What name is given to the elements in group 1?

alkali metals.

Which halogen(s) will displace bromine from a solution of potassium bromide?

chlorine

Scientists observe that when lithium reacts with water, two new substances are formed (lithium hydroxide and hydrogen). They predict that the substances formed will have:

different properties than lithium and water have separately.

Two reactants are mixed in a test tube, and the test tube becomes very warm. This is a sign of a transfer of _____ taking place.

energy

"Meals, Ready to Eat" are an instant hot meal developed by the U.S. military for troops. The meal heats up when water is added to the magnesium metal tray because the chemical reaction between water and magnesium is an _________.

exothermic reaction

→Pt

formula written above the arrow is used as a catalyst in the reaction

(g)

gas

When zinc metal is mixed with hydrochloric acid, what is produced?

gas

(l)

liquid

When a chemical reaction takes place, the reaction must end with the same _____________ it began with.

number of atoms

(aq)

reactant or product in an aqueous solution (dissolved in water)

The _____ oxide turned to the silver metal when mercury (II) oxide was heated.

red

What color is Mercury (II) Oxide?

red

replaces the yield sign for reversible reactions that reach equilibrium

Endothermic

requiring the absorption of heat. (colder)

(s)

solid

→Δ

triangle indicates that the reaction is being heated

What color is lead(II) iodide?

yellow

yield sign; separates reactants from products


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