What type of words should you include when you write your hypothesis

Chemistry

2 answers:

nignag [31]3 years ago

7 0

Answer:

An if/then statement. If ____happens, then _____ happens.

Explanation:

djyliett [7]3 years ago

3 0

I think / if ____ happens,then i think ___will happen

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according to the diagram, what three quantities can you calculate if you know the number of moles of a compound

Tems11 [23]

The number of moles of a substance can be used to calculate its mass, the number of atoms present in the compound as well as the number of moles of individual atoms/ions in the compound.

The number of moles of a compound or ion is defined as the ratio of its mass to its molar mass. The number of moles of a substance is very important when performing stoichiometric calculations.

If you have the number of moles of a substance you can find;

The mass of the substance
The number of atoms or ions in the substance
The number of moles of individual atoms/ ions in the substance.

Learn more: brainly.com/question/865531

4 0

2 years ago

How many mg of calcium are present in a 500-mg tablet of calcium carbonate??

Setler79 [48]

The molar mass of calcium carbonate is 100 mg/mmol, so the number of moles is:

moles CaCO3 = 500 mg / (100 mg/mmol) = 5 mmol

We see that there is 1 mole of Ca per 1 mole of CaCO3, therefore:

mass Ca = 5 mmol * (40.08 mg/mmol) = 200.22 mg

3 0

3 years ago

Consider the reaction pathway graph below.

igomit [66]

Answer:

subtract E from D

Explanation:

The graph shown the potential energy diagram of the reaction "reaction pathway".

X-axis represents the reaction progress, the transformation from the reactants to the products passing via the transition state.

Y-axis represents the potential energy of the reactants and the products and also the intermediate.

As clear from the attached image "F" represents the position of the reactants of the reaction, "B" represents the position of the intermediate/transition state and "G" represents the position of the products of the reaction.
Region "A" is the potential energy difference between the intermediate "B" and the reactants "F" which represents the activation energy of the reaction "Ea". Activation energy "Ea" can be defined as the minimum energy that the reactants should posses to initiate the reaction.
Region "C" is the potential energy difference between the reactants "F" and the products "G" which represents the enthalpy change of the reaction "ΔH".
ΔH = pot. energy of the products "G" - pot. energy of the reactants "F".
If "ΔH" is positive this means that the reaction is endothermic and this occurs when the potential energy of the products is greater than that of the reactants.

If "ΔH" is negative this means that the reaction is exothermic and this occurs when the potential energy of the products is smaller than that of the reactants.
In our example, It is obvious that the energy of the reactants is greater than the potential energy of the products.

So, ΔH will have a negative value which means that the reaction is exothermic reaction.
Thus, the right choice is: "subtract E from D" would provide evidence to support the inference that this is an exothermic reaction.