The temperature reading of –14°C corresponds to a Kelvin reading of:

A diver is going through ocean search-and-rescue training. The graph shows the relationship between her depth and the time in se

Bas_tet [7]

Answer:

The answer is below

Explanation:

The graph is attached. The time in seconds (s) is plotted on the x axis and the depth in feet (ft) on the y axis.A positive depth is used to represent above the water and a negative depth means below the water.

From the graph, the point (5, -8) is the maximum depth in which the diver has traveled. This means that at 5 seconds, the diver was 8 feet below the water. After 5 seconds, the diver start to swim ul\p

4 0

2 years ago

A student is trying to classify an unidentified, solid gray material as a metal or a nonmetal. Which question will best help the

vekshin1

Answer:

A - Is the material malleable or ductile?

Explanation:

3 0

2 years ago

Determine the percent yield for the reaction between 6.92 g K and 4.28g of oxygen gas if 7.36 g of potassium oxide is produced.

Illusion [34]

Answer:

percentage yield = 88.25%

Explanation:

Firstly, write the chemical reaction and balance the equation.

Potassium react with oxygen to produce potassium oxide.

K + 02 → K2O

Balance the equation

4K + 02 → 2K2O

The limiting reactant is K so the yield of potassium oxide can be calculated using grams for potassium.

atomic mass of K = 39.1g/mol

grams for 4 mole of potassium = 4(39.1) = 156.4 g

grams for 2 moles of K2O = 2( 39.1 × 2 + 16) = 188.4 g

If 156.4 g of K produces 188.4 g of K2O

6.92 g of K will produce ? gram of K2O

cross multiply

grams of K2O = 6.92 × 188.4/156.4

grams of K2O = 1303.72/156.4

grams of K2O = 8.33585677749

grams of K2O = 8.34 g

percentage yield = actual yield/theoretical yield × 100

actual yield = 7.36 g

theoretical yield = 8.34 g

percentage yield = 7.36/8.34 × 100

percentage yield = 736/8.34

percentage yield = 88.2494004796%

percentage yield = 88.25%

5 0

2 years ago

Interpret: Since hot packs release heat, you might assume that cold packs release cold. Use the definition of endothermic to exp

Anastasy [175]

Answer:

Endothermic means: accompanied by or requiring the absorption of heat. So therefor cold packs would not be endothermic because they don't release cold. Instead they absorb heat

Explanation:

7 0

2 years ago

When elemental sodium is added to water, the sodium atoms ionize spontaneously. uncharged na becomes na+. this means that the na

Temka [501]

Ionized, become charged, become a cation

hopefully that helps

5 0

2 years ago