All mixtures are made up of 2 or more elements or compounds.
All mixtures are made up of solutions
All mixtures are made up of compounds.
All mixtures are made up of elements.
All mixtures are made up of two or more elements or compounds.
Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:
1)Molecular compounds where in atoms are joined by covalent bonds.
2) ionic compounds where atoms are joined by ionic bond.
3)Inter-metallic compounds where atoms are held by metallic bonds
4) co-ordination complexes where atoms are held by co-ordinate bonds.
They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.
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Answer:
Answer the first ine made up of 2 or more.....
The sides of a metal pan become hot when the pan is placed on a stove burner.
A person gets a sunburn from lying on the beach too long.
An ice cube melts when a person holds it in his hand.
Answer:
An ice cube melts when a person holds it in his hand.
Explanation:
The correct option is D.
Substances that can conduct electricity in aqueous solutions are called electrolytes. Calcium chloride is an example of an electrolyte. Ionic compounds are usually good electrolytes, this is because they contain mobile ions, which can carry electricity round an electrical circuit. Both positive and negative ions are present in electrolytes; the positive ions comes from the metals while the negative ions comes from the non metals. These ions are able to move about when the compound is in the molten form or in aqueous solution.
To fully react with 750 g of HCl (approximately 20.5 moles), a minimum of 10.25 moles of sodium carbonate is needed.
To calculate the minimum amount of sodium carbonate needed to react fully with 750 g of HCl, we need to start by converting the 750 g of HCl to moles. The molecular weight of HCl is about 36.5 g/mol, so 750 g is about 20.5 mol of HCl. Looking at the reaction equation Na2CO3 + 2HCl → 2NaCl + CO2 + H2O, you can see that you need one mole of sodium carbonate to react with two moles of HCl. Therefore, to fully react with 20.5 mol of HCl, you will need a minimum of 10.25 mol of sodium carbonate.
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Answer:
T2 = 29.79°C
Explanation:
Equliibrium signifies that heat loss = heat gained
Heat gained by Ice;
H = ML
Mass, M = Number of moles * Molar mass = 1 * 18 = 18g
l = 6.01 k J m o l = 334 J/g
C = 4.186 J/g
H = 18(334)
H = 6012
Heat lost by water
H = MCΔT
H = 18 * 4.186 * (50 - T2)
H = 3767.4 - 75.348T2
Since H = H, we have;
6012 = 3767.4 - 75.348T2
- 75.348T2 = 3767 - 6012
T2 = 2245 / 75.348
T2 = 29.79°C