Which of the following metals is soluble in water with S2-?

Is a graph that starts at 25 and drops to 21, stays the same in temperature an endothermic reaction or an exothermic reaction?

ki77a [65]

Answer:

Explanation:

Endo and Exo thermic are defined by what changes take place in the environment of the reaction.

If the temperature goes up, the reaction is giving up heat. It is Exothermic.

If the temperature goes down, the reaction requires heat. It is Endothermic.

In this case, the temperature went down. The reaction is Endothermic.

5 0

2 years ago

Which statement best describes the properties of sucrose?

crimeas [40]

Answer:

D. They are different from the properties of carbon, oxygen, and hydrogen.

Step-by-step explanation:

Carbon, oxygen, and hydrogen are all elements.

Sucrose is a compound containing carbon, oxygen, and hydrogen. Its properties are different from those of its elements.

For example, carbon is a black solid, while oxygen and hydrogen are colourless gases. Sucrose is a white solid.

6 0

4 years ago

Read 2 more answers

What mass in grams of a molecular substance (molar mass = 50.0 g/mol) must be added to 500 g of water to produce a solution that

Lera25 [3.4K]

Answer: The mass of the substance that must be added is 75.2 grams.

Explanation:

Elevation in boiling point is defined as the difference in the boiling point of solution and freezing point of pure solution.

The equation used to calculate elevation in boiling point follows:

$\Delta T_b=\text{boiling point of solution}-\text{boiling point of pure solution}$

$\Delta T_b$ = ? °C

Boiling point of pure water = 100°C

Boiling point of solution = 101.54°C

Putting values in above equation, we get:

$\Delta T_b=(101.54-100)^oC=1.54^oC$

To calculate the elevation in boiling point, we use the equation:

$\Delta T_b=iK_bm$

Or,

$\Delta T_b=i\times K_b\times \frac{m_{solute}\times 1000}{M_{solute}\times W_{solvent}\text{ in grams}}$

where,

$\Delta T_b$ = 1.54°C

i = Vant hoff factor = 1 (For non-electrolytes)

$K_b$ = molal boiling point elevation constant = 0.512°C/m.g

$m_{solute}$ = Given mass of solute = ? g

$M_{solute}$ = Molar mass of solute = 50.0 g/mol

$W_{solvent}$ = Mass of solvent (water) = 500 g

Putting values in above equation, we get:

$1.54^oC=1\times 0.512^oC/m\times \frac{m_{solute}\times 1000}{50.0g/mol\times 500}\\\\m_{solute}=\frac{1.54\times 50.0\times 500}{1\times 0.512\times 1000}=75.2g$

Hence, the mass of substance that must be added is 75.2 grams.

3 0

4 years ago

3. A 0.821-mol sample of a substance composed of diatomic molecules (of the same atom) has a

ivanzaharov [21]

104949.991110192929292929

8 0

3 years ago

What is the mass number of neon (Ne)? A. 20 B. 18 C. 10 D. 2

kupik [55]

Answer:

A

Explanation:

it is round up to 20

7 0

3 years ago

Read 2 more answers