Answer:
I pretty sure it's the pH level 7
Answer:
The answer to your question is: c
Explanation:
A descomposition reaction is a chemical reaction in which the only one reactant yields two or more products.
a) HCl + NaHCO3 → H2O + CO2 + NaCl
This is not a descomposition reaction because there are two reactants not one, this option is incorrect.
b) 2Na + Cl2 → 2NaCl
THis option is also incorrect because there are two reactants in descompositin reaction there is only one reactant.
c) 2HgO → 2Hg + O2
There are only one reactant that yields 2 products, this is a descomposition reaction.
d) AgNO3 + NaCl → AgCl + NaNO3
THis is not a descomposition reaction because there are two reactants.
Compounds having covalent bonds are dinitrogen trioxide, carbon dioxide.
compounds having ionic bonds are calcium chloride, Magnesium nitride, sodium bromide, aluminum oxide.
Explanation:
When a positive charged cation gets bonded with negative charge anion by transferring its electrons the ionic bonds are formed. It is seen between metals and non-metals.
In covalent bonds the electrons are shared equally between two atoms. It is generally seen bonds between 2 non metals.
Dinitrogen trioxide : It is a covalent compound as bonding between two non metals is there ie nitrogen and oxygen.
In carbon dioxide carbon has four electrons in outermost shell which have strong attraction with nucleus cannot be lost neither it can accommodate 4 electrons to stabilize the valence shell. Thus sharing takes place and its covalent bonding.
In calcium chloride ionic bond is formed because calcium gives 2 electrons to each of the chloride atoms and thus gets 2+ charge on calcium. Sharing of electrons let the octet complete.
Magnesium nitride is formed when Mg loses 2 electrons to complete octet and nitride gains 3 electrons. The electrostatic attraction causes ionic bonding in it.
sodium bromide: Bromine is electronegative i.e electron donor and sodium is highly electrospositive hence sharing of electrons would cause electrostatic attraction between them.
aluminum oxide : The ideal situation of ionic bonds that is between metal and non-metals is present in aluminum oxide.
Answer:D
Explanation:
Number of electrons=Number of protons
Sodium atom has 1 valence electron
Answer:
- Density Liquid = 0.841 g/mL
- Density Metal = 2.711 g/cm³
Explanation:
- The density of the liquid is:
Mass Liquid / Volume Liquid
From the problem we know that Volume Liquid = 25.0 mL, <u>the mass of the liquid can be calculated by substracting masses</u>:
- Mass Liquid + Mass Slug + Mass Empty Cylinder = 125.934 g
- Mass Liquid + 15.454 g + 89.450 g = 125.934 g
- Mass Liquid = 125.934 g - 15.454 g - 89.450 g
Thus the density of the liquid is:
Density Liquid = 21.030 g / 25.0 mL = 0.841 g/mL
2. The density of the metal slug is:
Mass Metal / Volume Metal
We already know that the mass of the slug is 15.454 g. Its volume can be calculated using <em>Archimede's principle</em>, which states that the volume of an object is equal to the volume of liquid it displaces, in other words:
Volume Metal = 30.7 mL - 25.0 mL = 5.7 mL
Thus the density of the metal slug is
Density Metal = 15.454 g / 5.7 mL = 2.711 g/mL = 2.711 g/cm³