Science chemical balanced

CO2 is what ?

Carbon dioxide

What's color by itself ?

is not a significant identifier of a substance

subscript

is written to the lower right of the element symbol. If no subscript is written, only one atom of that element is part of the compound. For example, in H2O, the number 2 is the subscript for hydrogen and means that there are 2 atoms of hydrogen in the compound of water; since there is no subscript for oxygen it is assumed to be one atom of oxygen.

Where is the subscript written?

written to the lower right of the element symbol.

Density

Density is a property that describes the relationship between the mass of a material and its volume. Substances that are denser contain more matter in a given volume.The density of a substance will stay the same no matter how large or small the sample of the substance, and therefore, density can be used as a physical property for identification of the substance. For example, lead is a very heavy, dense metal. The density of lead is much greater than the density of the very light metal, aluminum.

What is hydrogen gas symboll?

H2

Product

Product New substances formed in a chemical reaction. Products are located on the right side of the arrow.For example, the following chemical equation shows the formation of water (H2O) from oxygen gas (O2) and hydrogen gas (H2). The reactants are oxygen gas (O2) and hydrogen gas (2H2), located on the left side of the arrow. The product, water (2H2O), is on the right side of the arrow.

What side is the product?

Right

NaCl is what?

Salt

What does Na mean?

Sodium

The ability to burn

The ability of a substance to burn is a chemical property that involves a substance reacting quickly with oxygen to produce light and heat.

The ability to rust

The ability of a substance to rust is a chemical property that involves a substance reacting slowly with oxygen. The process is called rusting.

H2O is what ?

Water

balanced chemical equation

balanced chemical equation has the same number of each kind of atom on the reactant side as on the product side. To determine whether a chemical equation is balanced, two numbers are considered: the subscript (7-5.7) and the coefficient.

Chemical properties

can also be used to help identify a substance. Chemical properties can be recognized only when substances react or do not react chemically with one another, that is, when they undergo a change in composition. A chemical property of one substance usually involves its ability to react (combine) or not react with another specific substance. Two examples of chemical properties include:

Physical properties

can be observed and measured without changing the kind of matter being studied. The following physical properties can be used to help identify a substance:

Elements are made up of how many atoms?

one kind of atom and the symbol for each element is unique.

What's C2H4O2

Acetic acid

Chemical formulas:

Are constructed from the symbols of elements composing the substances

Chemical equation

Chemical equation Used to represent a chemical reaction that has occurred. It contains the chemical names or the chemical formulas of the substances that are involved in the reaction. An arrow is used to distinguish between the substances that are broken apart or combined from the substances that are formed in the reaction. The arrow can be translated as "yields" or "makes."

Chemical symbols:

Chemical symbols: -Show the atoms of the elements composing a substance

What the symbol, for chlorine?

Cl

Color

Color can be used to help identify a substance, along with other properties. By itself color is not a significant identifier of a substance. Absence of color is also a physical property.

What does H mean ?

Hydrogen

What side is reactant?

Left

substances

NaCl - table salt, H2O - water, C6H12O6 - simple sugar, O2 - oxygen gas, CO2 - carbon dioxide, and N2 - nitrogen gas) (and the names and symbols for the elements listed in the chart (above).) For example, when students see the formula H2O, they should be able to recognize that this is water.

What's N2

Nitrogen gas

What does O mean ?

Oxygen

Reactant

Reactant Substances broken apart or combined in a chemical reaction. Reactants are located on the left side of the arrow.

Atoms are equaled on both sides ...

Reactant and product

The law of conservation of matter states

The law of conservation of matter states that matter can neither be created nor destroyed, but can be changed in form. Because matter is neither created nor destroyed, the total mass of the material(s) before the reaction is the same as the total mass of material(s) after the reaction.

A balanced chemical equation has what ?

The same number of each kind

Boiling Point

The temperature at which a liquid boils. During the process of boiling a substance changes from a liquid to a gas. Boiling begins when the liquid starts to form bubbles throughout, which grow larger, rise to the surface, and burst. As long as the substance is boiling the temperature of the liquid remains constant (at the boiling point). Boiling point is unchanging under constant conditions for a given substance and therefore can be used as a physical property for identification of the substance. The boiling point for pure water at sea level is 100oC or 212oF.

Melting Point

The temperature at which a solid can change to a liquid. The temperature at which a pure substance melts is unchanging under constant conditions. Therefore, the melting point of a pure substance can be used as a physical property for identification. Ice melts to form liquid water at 00C (32oF).

What are the four hydrogens

There are four hydrogen atoms on the reactant side (coefficient of 2 x subscript 2) and four hydrogen atoms on the product side (coefficient 2 x subscript 2).

an arrow is translated as..

Yields or makes

Compounds

are composed of more than one element and their formulas have more than one type of symbol showing the different elements that compose the compound.

Chemical formulas

are constructed from the symbols of the elements composing the substances.are constructed from the symbols of the elements composing the substances. In a chemical formula, the numbers as subscripts show how many of each kind of atom are in the compound. The subscript is written to the lower right of the element symbol. If no subscript is written, only one atom of that element is part of the compound. For example, in H2O, the number 2 is the subscript for hydrogen and means that there are 2 atoms of hydrogen in the compound of water; since there is no subscript for oxygen it is assumed to be one atom of oxygen.

Elements

are made up of one kind of atom and the symbol for each element is unique.

coefficient

coefficient is the number that comes before the chemical formula and indicates the number of particles that participate in the reaction. In order to determine whether an equation is balanced, multiply the number in front of the chemical formula in the equation (coefficient) by the number written below the symbol for the element(s) (subscript) in the formula. If no coefficient is written, it is understood to be one. For instance, for "2H2O" there are 4 hydrogen atoms and 2 oxygen atoms. The number of each kind of atom on the left side of the arrow must equal the number of each kind of atom on the right side of the arrow for the equation to be balanced.For example, in the chemical equation for the reaction of water (liquid) breaking into hydrogen (gas) and oxygen (gas) as represented by the balanced chemical equation: 2H2O —> 2H2 + O2 There are four hydrogen atoms on the reactant side (coefficient of 2 x subscript 2) and four hydrogen atoms on the product side (coefficient 2 x subscript 2). There are two oxygen atoms on the reactant side (coefficient 2 x (understood) subscript 1) and two oxygen atoms on the product side ((understood coefficient 1 x subscript 2). There are the same number of hydrogen atoms (4) and oxygen atoms (2) on both sides of the equation; therefore, the equation is said to be balanced. Since there are the same number of each kind of atom on both sides of the arrow and atoms represent kinds of matter, the amount of matter is the same on both sides of the equation, which supports the law of conservation of matter.