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2 years ago

A solution of sucrose (sugar) in water is in equilibrium with solid sucrose. If more solid sucrose is now added, with stirring,

1 answer:

7 0

When equilibrium is reached, the solution is said to be saturated. A solution containing a higher concentration of solute than its solubility is said to be supersaturated.

Answer: d

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A 17.98-g piece of iron absorbs 2056.5 joules of heat energy, and its temperature changes from 25°C to 200°C. Calculate the spec

V125BC [204]

Answer: $0.65\ J/g.^{\circ}C$

Explanation:

Given

Mass of iron piece is $m=17.98\ g$

Heat absorbed $Q=2056.5\ J$

Temperature changes from $25^{\circ}C\ to\ 200^{\circ}C$ i.e.

$\Delta T=200-25=175^{\circ}C$

Heat absorbed is given by $Q=mc\Delta T\quad [c=\text{specific heat of material}]$

Insert the values

$\Rightarrow 2056.5=17.98\times c\times 175\\\\\Rightarrow c=\dfrac{2056.5}{3146.5}\\\\\Rightarrow c=0.65\ J/g.^{\circ}C$

Thus, the specific heat of iron is $0.65\ J/g.^{\circ}C$

7 0

3 years ago

Use the de Broglie's Wave Equation to find the wavelength of an electron moving at 7.3 × 106 m/s. Please show your work. Note: h

ad-work [718]

Answer:

$\lambda=9.96\times 10^{-11}\ m$

Explanation:

The expression for the deBroglie wavelength is:

$\lambda=\frac {h}{m\times v}$

Where,

$\lambda$ is the deBroglie wavelength

h is Planck's constant having value $6.62607\times 10^{-34}\ Js$

m is the mass of electron having value $9.11\times 10^{-31}\ kg$

v is the speed of electron.

Given that v = $7.3\times 10^6\ m/s$

Applying in the equation as:

$\lambda=\frac {h}{m\times v}$

$\lambda=\frac{6.62607\times 10^{-34}}{9.11\times 10^{-31}\times 7.3\times 10^6}\ m$

$\lambda=\frac{10^{-34}\times \:6.626}{10^{-25}\times \:66.503}\ m$

$\lambda=\frac{6.626}{10^9\times \:66.503}\ m$

$\lambda=9.96\times 10^{-11}\ m$

6 0

3 years ago

Every pure substance has exact and specific density. What are two purposes that a chemist would use a calculated density for.

adell [148]

Answer:

1. Density can be used to identify a substance

2. Density can be used to ascertain whether a substance will float in water.

Explanation:

The calculation of the density of a substance can be used to identify the substance. If the density of a substance is calculated accurately, and compared with a table of standard densities, then we can identify that substance.

Also, density determines whether an object will float or sink in water. If an object is less dense than water then it will float in water. If it is denser than water, then it will sink in water.

7 0

3 years ago

All of the following can be an affect of pollution EXCEPT

Gelneren [198K]

Except D.
Pollution doesn't prevent cancer.
Unless the pollution is made of a cancer-curing medicine.

5 0

3 years ago

Read 2 more answers

A certain automobile contains 4 tires, 2 headlights, 1 steering wheel,

Step2247 [10]

Answer:

143 parts I think probably not

5 0

3 years ago