Based on its location on the periodic table, which element(s) have properties similar to N? Choose all that apply. *

When salt is placed on ice the ice melts. explain why?

Licemer1 [7]

Explanation:

When salt is added to ice, salt first dissolves in the film of liquid water that is always present on the surface, thereby lowering the ice's freezing point

please mark as brainliest ,I really need it

7 0

4 years ago

Please help 100 points.

Alexandra [31]

A. Snails and crayfish would not survive in Birch Lake at a pH of 6.2.

B. Once they die out, the walleye will disappear as well.

Walleye: pH 6.0 — pH 9.0

Crayfish: pH 6.5 — pH 8.0

Snails: pH 6.4 — pH 8.0

At pH = 7.3, all three can survive.

At pH = 6.2, snails and crayfish will die out.

Then, the walleye will disappear because <em>their food supply has vanished</em>.

6 0

3 years ago

If there is 25.0 L of gas at a temperature of 350C what is the temperature if the volume increases to 75.0L?

Zielflug [23.3K]

Answer:

The new temperature is 1596 C.

Explanation:

Charles's Law indicates that for a given sum of gas at constant pressure, as the temperature increases, the volume of the gas increases, and as the temperature decreases, the volume of the gas decreases.

Statistically, Charles's law is a law that says that when the amount of gas and pressure are kept constant, the ratio that exists between the volume and the temperature will always have the same value:

$\frac{V}{T}=k$

Being an initial state 1 and a final state 2, it is fulfilled:

$\frac{V1}{T1}=\frac{V2}{T2}$

In this case:

V1= 25 L
T1= 350 C= 623 K (being 0 C= 273 K)
V2= 75 L
T2= ?

Replacing:

$\frac{25 L}{623 K} =\frac{75 L}{T2}$

Solving:

$T2*\frac{25 L}{623 K} =75 L$

$T2=75 L*\frac{623 K}{25 L}$

T2= 1869 K= 1596 C

<u><em>The new temperature is 1596 C.</em></u>

4 0

3 years ago

Question 2 of 50

wolverine [178]

The thermal decomposition of calcium carbonate will produce 14 g of calcium oxide. The stoichiometric ratio of calcium carbonate to calcium oxide is 1:1, therefore the number of moles of calcium carbonate decomposed is equal to the number of moles of calcium oxide formed.

Further Explanation:

To solve this problem, follow the steps below:

Write the balanced chemical equation for the given reaction.
Convert the mass of calcium carbonate into moles.
Determine the number of moles of calcium oxide formed by using the stoichiometric ratio for calcium oxide and calcium carbonate based on the coefficient of the chemical equation.
Convert the number of moles of calcium oxide into mass.

Solving the given problem using the steps above:

STEP 1: The balanced chemical equation for the given reaction is:

$CaCO_{3} \rightarrow \ CaO \ + \ CO_{2}$