What describes using organisms that were only alive during a specific time period to estimate the unknown age of items
A radioactive dating
B law of superposition
C relative dating
D index fossil
Answer:
c i just took the test
Explanation:
What is the difference between the chemical symbols CI and Cl2?
Cl refer to chlorine atoms. They don't exist naturally in that form. Rather, Cl2 refer to chlorine molecules, and they exist as that form in nature.
how many atoms are there in a 1 mol sample of water
Answer:
Explanation:
1 molecule has 2 hydrogens and 1 oxygen. That's 3 atoms.
1 mol of anything is 6.02 * 10^23 items. There are 3 atoms in 1 molecule
There are 6.02*10^23 * 3 atoms in a mol of water
Answer: 1.804 * 10^24 atoms in a mol of water.
What factors do you think should be considered in selecting a metal to use to reclaim copper? Which factor do you think is the most important? Explain.
Answer:
Aluminum
Explanation:
Aluminum would be the best choice to reuse copper from the copper chloride solution because it In the aluminum–copper reaction, the chloride ions help remove the aluminum oxide coating so that a reaction can take place through the oxidation of aluminum and the reduction of copper ions.The aluminum–copper chloride reaction is a simplified version of a waste reclamation and reduction strategy for handling toxic-waste materials.Please help me with this question. What are two elements that will react similarly to beryllium ?
Probably the two elements with properties most like beryllium are magnesium and aluminum.
According to the electronic configuration elements that will react similarly to beryllium are magnesium and calcium.
What is electronic configuration?Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
Learn more about electronic configuration,here:
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HELP ME PLEASE!!
Density (D) is defined by mass/volume .
Which item increases as heat is applied?
D
m
V
Answer:
volume
Explanation:
things expand when heat is applied taking up more space hence volume
Calculate the mass in grams of carbon dioxide produced from 11.2 g of octane (C8H18) in the reaction above.
18 + 25 O2 --> 16 CO2 + 18 H2O
89.6 g
17.3 g
34.5 g
46.2 g
Answer:
34.6g
Explanation:
Given parameters:
Mass of Octane = 11.2g
Reaction expression;
2C₈H₁₈ + 25O₂ → 16CO₂ + 18H₂O
Mass of octane = 11.2g
Unknown:
Mass of carbon dioxide produced = ?
Solution:
From the balanced reaction equation;
2 mole of octane produced 16 moles of carbon dioxide
From the given specie, let us find the number of moles;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of C₈H₁₈ = 8(12) + 18(1) = 114g/mole
Number of moles of octane = [tex]\frac{11.2}{114}[/tex] = 0.098mole
2 mole of octane produced 16 moles of carbon dioxide
0.098 mole of octane will produce [tex]\frac{0.098 x 16}{2}[/tex] = 0.79mole of CO₂
Mass of CO₂ = number of moles x molar mass
Molar mass of CO₂ = 12 + 2(16) = 44g/mol
Mass of CO₂ = 0.79 x 44 = 34.6g
If you have 1.26 x 1024 molecules, how many moles do you have?
Answer:
2.09 moles
Explanation:
1 mole=6.022*10^23 moles --> 1.26×10^(24)/(6.022*10^23)=2.09 moles
Using your knowledge of symbols, determine which compound listed must contain both copper and oxygen.
1. malachite, Cu 2CO 3(OH) 2
2. calcite, CaCO 3
3. glucose, C 6H 12O 6
4. chalcopyrite, CuFeS 2
Answer:
The correct option is Malachite which has both copper nd oxygen.
Explanation:
As we the symbol of copper is Cu while the symbols of oxygen is O. As the chemical formula of malachite is Cu₂CO₃(OH)₂. So it has Cu as well as O.
Glucose has only oxygen but no copper
Chalcopyrite has copper but no oxygen
Calcite has oxygen but no copper.
So correct answer is only malachite.
pls give brainlist
I have similar chemical and physical properties to calcium but my molecular mass is lower, what element am I?
-Potassium
-Scandium
-Magnesium
-Strontium
The melting point of table salt is 801.Is this a physical or chemical property
Answer:
Physical
Explanation:
When something melts it is still the same substance.
For example:
Ice and water are still both water, so that would be a physical change.
If a reaction changes the substance into a new/different substance then it is a chemical change.
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Answer:
2Fe₂O₃
Explanation:
If the number of atoms of each element are the same on reactant and product sides, it is a balanced equation. This is not a balanced equation because the number of atoms of each element are not the same on reactant and product sides.
To balance an equation, let's first list the atoms:
FeOThen, we count the number of atoms on both sides:
1 Fe 22 O 3We multiply the number of atoms for each element on either side by the number of molecules (aka coefficient, or "big number"):
4 Fe 26 O 3To balance the equation, we need the total number for Fe on the right side to be 4, and the total number for O on the right side to be 6. We can do that by adding a "big number", or coefficient in front, which when multiplied by the number of atoms for each element, makes a balanced equation.
2 is a good value: 2 × 2 = 4, and 2 × 3 = 6.
As such:
4Fe + 3O₂ → 2Fe₂O₃