All categories

3 years ago

A. How does the atomic radius change going down and across the periodic table?

1 answer:

6 0

Answer: A when going down the periodic table your atomic radius will get bigger same if you got to the side. B Moving left to right within a period or upward within a group, the first ionization energy generally increases

Explanation:

You might be interested in

What is the progression of a space rock as it from space to Earth’s surface?

Bezzdna [24]

I think that's called "Trajectory"

3 0

4 years ago

Read 2 more answers

A hydrogen filled balloon has a volume of 8.3 L at 36°C and 751 mmHg. How many moles of hydrogen are inside the balloon?

tamaranim1 [39]

Answer: I think the formula is PV=nRT and I divide both sides by RT, but this is as far as I can get in my equation before I get stumped: (751 mm Hg) (8.3 L)/ (309 K) Can you help?

Explanation:

8 0

3 years ago

How many grams of carbon dioxide are created from the complete combustion of 21.3 L of butane at STP?

Bond [772]

Answer:

165.5 g of CO2

Explanation:

We must first put down the balanced reaction equation:

C4H10(g) + 13/2 O2(g) ------> 4CO2(g) + 5H2O(g)

From the reaction equation, one mole of butane occupies 22.4 L hence we can establish the stoichiometry of the reaction thus:

22.4 L of butane created 174 g of CO2

Therefore 21.3 L of butane will create 21.3 × 174/22.4 = 165.5 g of CO2

3 0

4 years ago

When a 3.80 g sample of C8H18(l) is burned in a bomb calorimeter, the temperature of the calorimeter rises by 27.3 oC. The heat

Fudgin [204]

Answer: The enthalpy of the reaction is -5112.5 kJ/mol

Explanation:

To calculate the heat absorbed by the calorimeter, we use the equation:

$q=c\Delta T$

where,

q = heat absorbed

c = heat capacity of calorimeter = 6.18 kJ/°C

$\Delta T$ = change in temperature = 27.3°C

Putting values in above equation, we get:

$q=6.18kJ/^oC\times 27.3^oC=168.714kJ$

Heat absorbed by the calorimeter will be equal to the heat released by the reaction.

Sign convention of heat:

When heat is absorbed, the sign of heat is taken to be positive and when heat is released, the sign of heat is taken to be negative.

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Given mass of octane = 3.80 g

Molar mass of octane = 114 g/mol

Putting values in above equation, we get:

$\text{Moles of octane}=\frac{3.80g}{114g/mol}=0.033mol$

To calculate the enthalpy change of the reaction, we use the equation:

$\Delta E=\frac{q}{n}$

where,

q = amount of heat released = -168.714 kJ

n = number of moles = 0.033 moles

$\Delta E$ = enthalpy change of the reaction

Putting values in above equation, we get:

$\Delta E=\frac{-168.714kJ}{0.033mol}=-5112.5kJ/mol$

Hence, the enthalpy of the reaction is -5112.5 kJ/mol

4 0

3 years ago

Antifreeze is mixed with water in a car's cooling system because the solution what?

Nikolay [14]

Antifreeze is an additive in water-based liquid to lower down the freezing point of such liquid. It is used to make use of the colligative properties of solutions specifically freezing-point depression for cold climate and boiling-point elevation to allow higher coolant temperature.

8 0

4 years ago