Chemistry Unit 3: Elements and Compounds

False (B)

True (A)

True (A)

<p>Si (B)</p> Signup and view all the answers

<p>Carbon (D)</p> Signup and view all the answers

<p>dog</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Nitrogen (B)</p> Signup and view all the answers

<p>The combining power of an element of a compound.</p> Signup and view all the answers

<p>AIN (B)</p> Signup and view all the answers

<p>3 (B)</p> Signup and view all the answers

<p>The name is incorrect because the cation (metal) should be named first, followed by the anion (nonmetal). The correct name for the compound is Calcium Sulfide.</p> Signup and view all the answers

<p>law</p> Signup and view all the answers

<p>A short hand expression of a chemical change (chemical reaction) through symbols and formulas.</p> Signup and view all the answers

<p>To obey the law of conservation of mass. In a balanced equation, the total number of atoms of each element on the reactant side must equal the total number of atoms of that element on the product side.</p> Signup and view all the answers

<p>Tella is prepared by fermenting a mixture of barley, teff, or sorghum. The yeast in the fermentation process converts sugars to alcohol, making it a chemical change.</p> Signup and view all the answers

<p>Other useful chemical reactions include: combustion (burning fuels), photosynthesis (plants converting sunlight into energy), rusting of iron (a chemical reaction with oxygen), neutralization (acid-base reactions to form salts), and many more.</p> Signup and view all the answers

<p>FeCl3 (D)</p> Signup and view all the answers

<p>He (D)</p> Signup and view all the answers

<p>Magnesium oxide (A)</p> Signup and view all the answers

<p>a. Zn b. P c. Hg d. Ca e. Sn</p> Signup and view all the answers

<p>a. 2Al(OH)3 → Al2O3 + 3H2O b. 4NH3 + 5O2 → 4NO + 6H2O c. 3Ca(OH)2 + 2H3PO4 → Ca3(PO4)2 + 6H2O</p> Signup and view all the answers

<p>a. 2Al + 3Br2 → 2AlBr3 b. 6Na + N2 → 2Na3N c. 2K + 2H2O → 2KOH + H2</p> Signup and view all the answers

A pure substance that cannot be broken down into simpler substances.

A substance formed when two or more elements chemically combine.

A shorthand way of representing elements or atoms of an element.

The symbolic representation of a compound, indicating the elements and their ratios.

The combining power of an atom, which helps in determining how elements bond.

Molecules made up of two atoms, usually of the same element.

A compound consisting of two different elements.

A process in which substances change into different substances.

Substances that undergo a chemical reaction.

Substances formed as a result of a chemical reaction.

Matter is neither created nor destroyed during a chemical reaction.

Ensuring the number of atoms for each element is equal on both sides of the equation.

The formation of an insoluble solid from a chemical reaction in solution.

A charged group of two or more atoms covalently bonded.

The smallest particle of a compound that can exist independently.

A number that indicates how many molecules are in a formula.

A number written below the line in a chemical formula indicating the number of atoms.

A reaction that releases energy, usually in the form of heat.

A reaction that absorbs energy from its surroundings.

The process by which plants use sunlight to synthesize foods from carbon dioxide and water.

The combining of elements or compounds to form a more complex compound.

A chemical reaction that typically involves oxygen and produces heat and light.

A biochemical process that converts sugars into acids, gases, or alcohol.

A representation of a chemical reaction using symbols and formulas.

Changes indicating a chemical reaction has occurred, like color changes or gas release.

The production of gas during a chemical reaction, indicated by bubbling.

Temperature changes that occur during a chemical reaction.

A solid that forms and separates from a liquid mixture during a chemical reaction.