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zaharov [31]
4 years ago
10

What forensic technique is seen as reliable? Why is this? what makes this technique more reliable and accurate than other techni

ques?
Chemistry
1 answer:
Diano4ka-milaya [45]4 years ago
8 0
Yes, the forensic technique is seen reliable nowadays especially the DNA testing. DNA testing is one of the highly recommended forensic techniques since prior to forensic science process, it will undergo first into rigorous examination and validation of the specimen.
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A 78.0 sample of gold at 175°C is put in a foam cup calorimeter with 25.0 g of water at 25.0°C. Calculate the specific heat of t
Nady [450]

The answer is the specific heat of the gold is 0.129 J/gC .

<h3>What is Calorimetry ?</h3>

It is an experimental method that allows one to calculate the heat change in a chemical process.

Calorimeter is just a reaction vessel. It could be a foam cup, a soda can, or a commercially available bomb calorimeter

Where q represents the heat change in the reaction, the calorimeter and the water. Since you are only measuring temperature, you will need to calculate the heat using it.

The change in heat of the gold is given by:

\rm q_{gold} = m c_{gold}\Delta T

=78 \times c_{p}\times (175-38.18)

The change in heat of the water is given by:

\rm q_{water} = mc_{p}\Delta T

m is the mass of water in the calorimeter in grams,

and delta T is the change in temperature.

where \rm c_{p} is the specific heat of water, which is 4.184 J/gC

mass of water =  25 g of water.

Temperature T₁ = 25°C

Final Temperature = 38.18 °C

Difference between temperature = 13.18 °C

\rm q_{water} = 25 \times 4.18\times 13.18

For a Foam Cup Calorimeter

\rm q_{water} = q_{cal}\\\\\\\rm 25\times4.18\times13.318 = 78 \times c_{p}\times (175-38.18)\\\\\\On \;solving\; this \;we \;get  \;c_{p} =  0.129

Therefore the  the specific heat of the gold is 0.129 J/gC

To know more about Calorimeter

brainly.com/question/4802333

#SPJ1

4 0
2 years ago
90 grams of glucose, C6H12O6, is dissolved in 2 liters of solution. Determine the molarity (M).
Masja [62]

Answer:

0.25 M

Explanation:

The first step is to determine how many moles of glucose there are, which means first finding out the molar mass of glucose. Carbon has a molar mass of about 12, hydrogen 1, and oxygen 16, so the total molar mass of glucose is about 6(12)+12(1)+6(16)=180 grams. This means that 90 grams is half a mole. Half a mole of substance divided by two liters of solution is (1/2)/2=1/4, or a molarity of 0.25. Hope this helps!

7 0
4 years ago
Can someone plz help me on question 3 I really need help plz
zavuch27 [327]

1. <em>Describe</em>

Frequency (f) and wavelength (λ) are inversely related.

f ∝ 1/λ

As one goes up, the other goes down and vice versa.

2. <em>Infer </em>

The frequency of infrared light is less than that of red light, so infra could mean something like less than or below or beneath.

Ultrahigh frequencies are extremely high compared with those of visible light. Ultrasound has frequencies that are far beyond what we can hear. An ultracentrifuge goes at extremely high speed, and an ultramicroscope can “see” tiny structures. Ultra could probably mean something like extremely or far beyond.

3. <em>Analyze </em>

Energy is directly proportional to frequency (E ∝ f).

Frequency is inversely proportional to wavelength (f ∝ 1/λ).

Energy is inversely proportional to wavelength (E ∝ 1/λ).

5 0
4 years ago
How many hybrid orbitals are found in CCl4?
Tatiana [17]
The answer is FOUR 4
hope this helps ;)
3 0
3 years ago
Read 2 more answers
1. What type of circuit is in the diagram?<br> parallel circuit<br> series circuit
devlian [24]

Answer:

A series circuit is defined as the circuit in which a number of resistances are connected one after the other.. In a series circuit, the flow of current follows a single path.

A parallel circuit is defined as the circuit in which a number of resistances are linked across each other in such a way that one terminal of each resistance is connected to form a junction point while the remaining end is also connected to form another point.

You havent added the diagram so i cant tell you the answer, but i added the definition of each circuit, see if that helps!

5 0
3 years ago
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