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3 years ago

I will give the brainliest for who answer this questio but no guessing

Chemistry

2 answers:

xz_007 [3.2K]3 years ago

8 0

IVA: nonmetal/other metals VIIA:halogens VIII: Nobel Gases

Gnoma [55]3 years ago

5 0

Answer:

IVA: nonmetal/other metals VIIA:halogens VIII: Nobel Gases

Explanation:makes sense

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3.15 mol of an unknown solid is placed into enough water to make 150.0 mL of solution. The solution's temperature increases by 1

nordsb [41]

<u>Answer:</u> The enthalpy change of the unknown solid is 3.824 kJ/mol

<u>Explanation:</u>

To calculate the mass of solution , we use the equation:

$\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}$

Density of solution = 1.20 g/mL

Volume of solution = 150.0 mL

Putting values in above equation, we get:

$1.20g/mL=\frac{\text{Mass of solution}}{150.0mL}\\\\\text{Mass of solution}=(1.20g/mL\times 150.0mL)=180g$

The equation used to calculate heat released or absorbed follows:

$Q=m\times c\times \Delta T$

q = heat absorbed or released

m = mass of solution = 180 g

c = specific heat capacity = 4.18 J/g°C

$\Delta T$ = change in temperature = 16.01°C

Putting values in above equation:

$Q=180\times 4.18\times 16.01=12045.9J=12.046kJ$

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

$\Delta H_{rxn}=\frac{q}{n}$

where,

q = amount of heat absorbed = 12.046 kJ

n = number of moles of solid = 3.15 moles

$\Delta H_{rxn}$ = enthalpy change of the reaction

Putting values in above equation, we get:

$\Delta H_{rxn}=\frac{12.046kJ}{3.15mol}=3.824kJ/mol$

Hence, the enthalpy change of the unknown solid is 3.824 kJ/mol

5 0

4 years ago

If a machine has an AMA of 1 what does this tell you about the RF and EF?

patriot [66]

Answer:

Although you might think of a machine as complex system of gears, drive belts and and a motor, the definition physicists use is much simpler. A machine is simply a device that does work, and there are only six different types of simple machines. They include the lever, the pulley, the wheel and axle, the screw, the wedge and the inclined plane.

Explanation:

6 0

3 years ago

Compare the illustration above with the choices below. Which picture best represents the outcome according to the law of conserv

lutik1710 [3]

the answer is A

100% sure

8 0

4 years ago

Read 2 more answers

The 1. BLANK difference between the ice cubes and the water causes 2.BLANK energy to be transferred from the water to the ice cu

ivanzaharov [21]

Answer:

the temperature difference between the water and the ice cubes causes heat to be transferred from the water to the ice cubes,.

Explanation:

Heat always travels to where it is colder. Think about how ice cubes melt. They are very cold so the heat is transferred to them from he warmer water and they melt.

hope this helps! i would really appreciate brainliest :)

4 0

4 years ago

Read 2 more answers

What kind of solution would you have if it contained 50 grams of sodium chloride in 100 mL of water at 30˚C?

Svetlanka [38]

Answer:

Supersaturated solution.

Explanation:

Hello!

In this case, according to the types of solution in terms of the relative amounts of solute and solvent, we can define a point called solubility at which the amount of solute is no longer dissolved in the solvent; thus, a value of solute/solvent less than the solubility is related to unsaturated solutions, equal to the solubility is related to the saturated solutions and more than the solubility to supersaturated solutions.

Thus, since solubility is temperature-dependent, at 30 °C the solubility of sodium chloride is 36.09 g per 100 mL of water; which means that, since the solution has 50 g of sodium chloride, more than 36.09 g, we infer this is a supersaturated solution.

Best regards!

5 0

3 years ago