Alkaline earth metal are the elements present in II group in the periodic table and are known as 'Metals' and have a charge of +2.
Alkaline earth metals - Be , Mg Ca, Sr , Ba, Ra
Halogens are present in VII A group in the periodic table and are 'Non-metals' and have a charge of -1.
Halogens - F, Cl, Br, I, At
When Alkaline earth metal (metals) combine with Halogens (non-metals) the compound formed will be ionic compound and the formula of the compound will be based on the charges of the element.
When we write the formula of the ionic compound the charges of the elements get criss crossed.
For example - Mg (Alkaline earth metal) have a charge of +2 and Cl (Halogen) have a charge of -1 and when they combine to form the formula their charges get criss crossed and we will get 
or 
When an alkaline earth metal, A, reacts with a halogen, X, the formula of the Ionic compound formed should be 
Answer:
carbon
Explanation:
tbh im not sure just guessing
Answer:
C.
Explanation:
Phase change is physical.
The question is incomplete, here is the complete question:
Gaseous compound Q contains only xenon and oxygen. When a 0.100 g sample of Q is placed in a 50.0-mL steel vessel at 0°C, the pressure is 0.230 atm. What is the likely formula of the compound?
A. XeO
B. 
C. 
D. 
E. 
<u>Answer:</u> The chemical formula of the compound is
<u>Explanation:</u>
To calculate the molecular weight of the compound, we use the equation given by ideal gas equation:
PV = nRT
Or,
where,
P = Pressure of the gas = 0.230 atm
V = Volume of the gas = 50.0 mL = 0.050 L (Conversion factor: 1 L = 1000 mL)
w = Weight of the gas = 0.100 g
M = Molar mass of gas = ?
R = Gas constant = 
T = Temperature of the gas = 
Putting value in above equation, we get:
The compound having mass as calculated is
Hence, the chemical formula of the compound is
Answer:
Explanation:
Brittleness : The ability of an object to break apart or shatter easily
Ductility: The ability of a substance to be stretched out into a long wire-like shape.
Lustre: the ability of an object to reflect light.
Malleability is a substance's ability to deform under pressure
The melting point of ice is 0°C. The melting point of a solid is the same as the freezing point of the liquid
Solubility is the relative ability of a solute to dissolve into a solvent.
solid: Has a definite shape and volume.
liquid: Has a definite volume, but take the shape of the container.
gas: Has no definite shape or volume. change of state
The resistance of a liquid to flowing is its viscosity.
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