Explanation:
CH4 + 2 O2 -> CO2 +2 H2O
4 H3N+3 O2 -> 6H2O + 2 N2
The formula C2H4 can be classified as both a molecular formula
and an empirical formula. The answer is number 4.
Just need the points
Calcium and vitamin D are essential to building strong, dense bones when you’re young and to keeping them strong and healthy as you age. The information included here will help you learn all about calcium and vitamin D – the two most important nutrients for bone health.
What is Calcium and What Does it Do?
Cheese, milk, fish, almonds, and other bone-healthy foods
A calcium-rich diet (including dairy, nuts, leafy greens and fish) helps to build and protect your bones.
Calcium is a mineral that is necessary for life. In addition to building bones and keeping them healthy, calcium enables our blood to clot, our muscles to contract, and our heart to beat. About 99% of the calcium in our bodies is in our bones and teeth.
Every day, we lose calcium through our skin, nails, hair, sweat, urine and feces. Our bodies cannot produce its own calcium. That’s why it’s important to get enough calcium from the food we eat. When we don’t get the calcium our body needs, it is taken from our bones. This is fine once in a while, but if it happens too often, bones get weak and easier to break.
Too many Americans fall short of getting the amount of calcium they need every day and that can lead to bone loss, low bone density and even broken bones.
How Much Calcium Do You Need?
Answer:
<em>ionic equation:</em>
2NH4(+)(aq) + CO3(2-)(aq) + Mg(2+)(aq) + 2Cl(-)(aq) → NH4(+)(aq) + Cl(-)(aq) + MgCO3(s)
<em>net ionic equation: </em>
NH4(+)(aq) + CO3(2-)(aq) + Mg(2+)(aq) + Cl(-)(aq) → MgCO3(s)
<em></em>
Explanation:
For ionic equations Start with a balanced molecular equation. Break all soluble strong electrolytes (compounds with (aq) beside them) into their ions
. Indicate the correct formula and charge of each ion
.Indicate the correct number of each ion
. Write (aq) after each ion and bring down all compounds with (s), (l), or (g) unchanged. The coefficients are given by the number of moles
(NH4)2CO3(aq)→ 2NH4(+) + CO3(2-). Then
2NH4(+)(aq) + CO3(2-)(aq) + Mg(2+)(aq) + 2Cl(-)(aq) → NH4(+)(aq) + Cl(-)(aq) + MgCO3(s)
For net ionic equations Write the balanced molecular equation.
Write the balanced complete ionic equation. Cross out the spectator ions that are present, it means the repeated ions on both sides of the equation. Write the "leftovers" as the net ionic equation.
NH4(+)(aq) + CO3(2-)(aq) + Mg(2+)(aq) + Cl(-)(aq) → MgCO3(s)