The amount of heat is calculated with the formula
q= m x Ce x <span> ΔT
q= heat
m= mass
Ce= specific heat
</span><span> ΔT= change in temperature
</span>m= 10.0 g
Ce = 0.903 J/gC
<span> ΔT = Tf - Ti = 35.0 - 20.0= 15
</span>
q= 10.0g x 0.903 J/gC x 15 = 135.45 J
B.) They all travel at the same speed
Explanation:
Anions and cations have different atomic sizes than the neutral atoms.
When the bromine atom becomes an anion, it ______ in size.
Anions involves gaining extra electrons. This basically leads to increased repulsion between the electrons and thereby increasing the size. Anions are always larger than the neutral atoms.
This means the answer is A. Increase
When the strontium atom becomes a cation, it ______ in size.
Cations involves losing valence electrons. This basically leads to a decrease in electron shells and electron repulsion thereby reducing the size. Cations are always larger than the neutral atoms.
This means the answer is B. Decrease
Answer:
SI, The International System of Units is a scientific method of expressing the magnitudes or quantities.
- amount of substance (mole)
- time (second)
- length (metre)
- mass (kilogram)
- electric current (ampere)
Hope this helps!
Use the mole ratio: 2 moles of NaN3 : 3 moles of N2
you have : 0.21 moles of NaN3 : x moles N2
Cross multiply: you get 0.3 moles for N2
To find the mass= # of moles * molecular mass
0.3 * 28
= 8.4g
