25 Answered Questions for the topic Elements


How large does a star need to be for its supernova to produce element 115

How large does a star need to be for its supernova or hypernova / collapsar to produce super heavy elements like 115?Also, how abundant are these stars in the universe?


Directional nuclear reaction

Is there a strong enough substance that could overcome the heat and pressure of a nuclear blast, while also directing that blast? Lets say with a concave structure attached to pod?I want to know,... more


Sequencing problem - Is it possible to solve this problem with the given information

I have a sequencing problem that I cannot find a way to solve using the three major formulas for finding sequencing elements. The difference between terms is given (1/2). The sum of the terms is... more


Stable Ions From Elements

Predict the most stable ions for the following elements:   Rb Sr Li Cs Kr


Given the following goals and materials, create a procedural that would allow the completion of the goal, then briefly explain why it would work.

Goal: To identify an unknown element    Materials: Lithium, Calcium, Aluminum, Carbon, Nitrogen, Oxygen, Iodine, Helium 


Metals and nonmetals are both good conductors.

Periodic table 


Can someone help me with empirical formula and molar mass?

How do I find out the empirical formula of a molecule and how do I find the molecular formula?   Ex:    1. What's the empirical formula of a molecule containing 65.5% carbon, 5.5% hydrogen, and... more


Don't understand the "Criss Cross Method for Predicting Formulas", can someone help?

I especially don't understand the crossing between PO₄⁻³ and Ba⁺², can someone please help?


what is the empirical formula?

the compound xylene consists of 90.49% C and the rest is hydrogen.What is the empirical formula?


determine the mass of each sample

1.16 mmol carbon disulfide


What is the smallest possible part of an element that still has all the properties of that element



A hydrogen bomb releases 1x10^17 joules. How many bomb explosions are equal to the sun's energy output each second?

A hydrogen bomb releases 1x1017 joules. How many bomb explosions are equal to the sun's energy output each second?


Use the following equation to answer the following questions. (Show Work Please)

Equation: 2 Mg + CO2 = 2 MgO + C (already balanced)   71.66 g of Mg react with 91.25g of CO2. What is the limiting reagent in the reaction? What is the theoretical yield of MgO? Express your... more


Write the formula + include ALL states of matter (Show Work Please)

Aluminum nitrate in solution reacts with aqueous potassium hydroxide to produce aluminum hydroxide and potassium nitrate


What are the products of this reaction? ( Show Work + Explain )

Li2SO4 + BaCl2    The product would be LiCl + BaSO4   I am pretty sure, but can you explain why please?


If 16.5 g of Al are reacted with 39.2 g of chlorine gas, then aluminum chloride is formed.

Which reactant is the limiting reactant? What is the theoretical yield?   Formula: 2 Al + 3 Cl2 = 2 AlCl3 (already balanced)   Show all work for the two questions please


Limiting Reagents (Chemistry) Answer a-d + Show Work Please

Equation: Al2(SO3)3 + 6NaOH = 3Na2SO3 + 2Al(OH)3 (already balanced)   a) If 10.0 g of Al2(SO3)3 is reacted with 10.0 g of NaOH, determine the limiting reagent.   b) Determine the number of... more


List an element that fits in each of the following groups.

Halogen = Alkali metal =  Lanthanide series = Transition metal = Chalogen = Noble gas = Alkaline Earth metal = Actinide series =


Statistics Question

Type | Probability 1 ton | 0.25 2 tons | 0.06 5 tons | 0.01 10 tons | 0.11 20 tons | 0.57     An appliance dealer sells 5 types of air conditioners. The above gives the distribution of the... more


Calculate the number of grams of each element...

Calculate the number of grams of each element in 100 g of phenolphthalein if the compound is 75.46% C, 4.43% H, and 20.10% O by mass. Convert each to moles.


Ionic Size

I really don't understand what this is asking... please help.   1.) As you move left to right across the period, there are two elements that instead show a decrease in ionization energy. Identify... more


To which group in the periodic table does element M belong?

A certain element M is a main group metal that reacts with chlorine to give a compound with the chemical formula MCl2 and oxygen to give the compound MO. To which group in the periodic table does... more


Some chemistry questions about elements, and compounds

Hello, I humbly appreciate if you will answer these ff. questions.   1. Can you tell whether a substance is an element or a compound based on its physical appearance? 2. Knowing that an element... more


Using Clues to Identify Elements

Elements 2, 5, 18, 29, and 33 are colorless, odorless, unreactive gases. Of these gases, element 29 has the largest atomic mass.Elements 13, 19, 23, and 34 have six valence electrons, and element... more


Venn diagram

- Draw an appropiate Venn diagram and use the given information to fill in the number of elements in each region.   n(A ∩ B) = 21, n(A ∩ B ∩ C) = 6, n(A ∩ C) = 26,        n(B ∩ C)= 7, n(A ∩ C') =... more

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