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How can you tell the difference between a phase change and when a chemical reaction produces a gas?
A phase change should not, in general, require more than one compound. A chemical reaction, by definition, will involve at least two compounds. The only "exception" would be a decomposition reaction, but in that case two different compounds would be formed so it's not really an exception.
How do you tell pure and mixture apart?
a pure substance only has one element and a mixture has many different compounds
Write the formula of the following compounds?
Unless you tell us in your question what compounds are listed, we can't answer it.
What are three things that chemical equations can tell you about a chemical reaction?
A chemical equation tells you what substances are reacting, what substances are produced and, in a balanced equation, provides the coefficients to tell us in what ratio the substances react or are produced.
What does a negative H tell you about a reaction?
yes
How can someone tell when equillibrium in a reaction has occured?
Equillibrium in a reaction has occured when the concentration of compounds remain unchanged.
How can you tell if two compounds will mix or react?
You can tell if two compounds will react by looking at the solubility rules. If a reaction were to happen it would make HNO3 and Na2SO4.
How do chemical reactions become balanced?
the molecules in the reaction react in ratios. for eg in water it is Hyogen and water in the ration 1:2. these ratios tell you how many of the atoms are required for the reaction.
How can you tell the difference between a phase change and when a chemical reaction produces a gas?
A phase change should not, in general, require more than one compound. A chemical reaction, by definition, will involve at least two compounds. The only "exception" would be a decomposition reaction, but in that case two different compounds would be formed so it's not really an exception.
What does the atomic symbol tell us about an element?
They tell you how many molecules of two or more compounds combine to form other molecules. The equation can, but will not always, tell you if the reaction requires heat or gives off heat (endothermic/exothermic), whether or not a catalyst is required.
Is a candle burns chemical reaction?
Yes, burning a candle is a chemical reaction. The easiest way to tell if something is a chemical reaction is if heat or light are given of, a new substance is formed, or a colour change happens. Chemical changes are irreversible.Yes, whenever a candle burns, it is a combustion reaction between the carbon compounds of the wick and wax of the candle and of oxygen in the air. These compounds burn to create carbon dioxide and water, and also a few smaller carbon compounds, which is evident as the smoke rising occasionally from the flame. The flame you see and the heat you feel rising off of the burning wick is the evidence of an exothermic chemical reaction.Yes, burning a candle is a chemical reaction. The easiest way to tell if something is a chemical reaction is if heat or light are given of, a new substance is formed, or a colour change happens. Chemical changes are irreversible.
What does h tell about a reaction?
The reaction is exothermic.
How are prefix used to name compounds?
Prefixes are used to tell how many of each kind of atom are in covalent compounds. - APEX
What does a positive H tell about a reaction?
The reaction is endothermic.
What does a negative deltaH tell about a reaction?
the reaction is exothermic
What does a negative H tell about a reaction?
The reaction is exothermic.
How do you tell pure and mixture apart?
a pure substance only has one element and a mixture has many different compounds
