All categories

3 years ago

Need these ASAP ignore the use evidence from the text in question 1

Chemistry

1 answer:

mr Goodwill [35]3 years ago

6 0

It requires more energy to boil an substance than to melt it (with special exceptions). When something is boiled you are furthering the distance between the already stretched out molecules which will require more energy to do so, also in most cases you will be creating a vapor from boiling which has a high kinetic energy value.

You might be interested in

Why do scientists use stirbars in the laboratory?

andrew11 [14]

Answer:

A stir bar consists of a magnetic bar used to agitate a liquid mixture or solution

Explanation:

7 0

2 years ago

What is the mass of a light bulb

DIA [1.3K]

It is completely dependent on the type of light bulb you are talking about. There are many different kinds of light bulbs, I cant give you a solid answer.

3 0

4 years ago

What is the specific activity (in Bq/g) if 1.07 kg of an isotope emits 3.77X10⁷β⁻ particles per minute?

raketka [301]

Specific activity is the activity per unit mass of a radionuclide and is a physical property of that radionuclide. Activity is a quantity (for which the SI unit is the becquerel) related to radioactivity, and is defined as the number of radioactive transformations per second that occur in a particular radionuclide.

How do you find the specific activity of an isotopes?

Activity = λN.
= (0.693/8 days) x (1/86,400 sec/day) x (3 x 1017 atoms)
= 3 x 1011 atoms/sec I-131.
= 3 x 1011 dps I-131.

<h3>What is the specific activity of Co 60?</h3>

The average specific activity of 60Co in continental aquatic sediments is in the region of 1 Bq. kg-1 dry weight (Eyrolle et al., 2008). Cobalt distribution in the abiotic compartments of continental aquatic systems is characterised by the strong affinity of the element for sediment.

Learn more about specific activity of isotopes here:

<h3>brainly.com/question/364529</h3><h3 /><h3>#SPJ4</h3>

3 0

1 year ago

The letters Cu, C, and Ca are all chemicals for elements<br> True or false

Oksi-84 [34.3K]

Answer:

true

Explanation:

cu is copper, c carbon, ca calcium

6 0

2 years ago

How reliable is the perfect gas law in comparison with the van der waals equation?calculate the difference in pressure of 10.00g

Semmy [17]

Answer:

The perfect gas law is reliable at the limit of pressure tending to zero. That is to say, at low pressure. The Van der Waals law instead can be used at higher pressures.

Explanation:

The perfect law equation is

$P.V = n.R.T$

The perfect gas law considers that the gas molecules have no interaction between each other and each molecule has null volume. This condition happens at the limit of pressure tending to zero.

The Van der Waals equation is

$(P +\frac{n^{2}.a}{V^{2}})(V-n.b) = n.R.T$

On the other hand, the Van der Waals law has two extra terms, one to consider the interaction of the molecules (n2a/V2) and other to consider the volume of the molecules (V-nb). These terms make a better approximation to a real gas.

Using the two equations to calculate the pressure (P) for CO2 with

With the perfect law equation:

$P = \frac{n.R.T}{V} = \frac{0.23molx0.082\frac{atm.L}{K.mol}x298K }{0.1L} = 56.2atm$

With the Van del Waals law:

$P = \frac{n.R.T}{V-n.b} -\frac{n^{2}.a}{V^{2} }$

$P = \frac{0.23molx0.082\frac{atm.L}{K.mol}x298K}{0.1L - 0.23molx0.0429\frac{L}{mol} }-\frac{(0.23mol)^{2}x3.658\frac{atm.L^{2}}{mol^{2}}}{(0.1L)^{2}} = 43 atm$

At this case the difference between the results of the two equations is due to the big mass of CO2 which produce a high pressure.

8 0

3 years ago