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9966 [12]
3 years ago
9

Which statement is correct about the conclusions of historical events? A) Historical event conclusions can be tested using the s

cientific method. B) Historical event conclusions are repeatable. C) Historical event conclusions are limited to evaluating existing evidence. D) Historical event conclusions can be observed in a laboratory setting.
Chemistry
2 answers:
kow [346]3 years ago
6 0

Answer: Historical event conclusions are limited to evaluating existing evidence.

Explanation: Historical events can be best understood by the examining the evidences discovered from different sites. That evidences may be present in the form manuscripts, literature, etc. And sometimes it is present in the form of fossils. Radio carbon dating is used to determine the age of such fossils which tells us about various conditions of that time when we examine it.

BARSIC [14]3 years ago
4 0

C is the correct answer I believe


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7 Which physical characteristic of a solution may
Nuetrik [128]

Answer:

2= its color

Explanation:

Transition elements are present in the middle of periodic table. These are d-block elements.

These are 38 elements.

All transition elements have partially filled d orbitals.

They showed color in compound because of d-d transition.

During the d-d transition electron absorbed the energy and emit the reminder energy. The emission is usually in the form of color light.

The color of ion is complementary to the absorbed color.

The transition elements are used as a catalyst in industries such as polymer, petroleum industries.

They are ductile, conduct heat and electricity.

5 0
2 years ago
Which liquids would cause the largest decrease in mass of a potato stick
riadik2000 [5.3K]

Answer:

distilled water I guess !

Just a guess though

If you find this useful, please mark my answer as the brainliest.

Explanation:

If you find this useful, please mark my answer as the brainliest.

distilled water

Explanation:

Some students investigated osmosis in raw potato sticks. The students measured the mass of three potato sticks using an electronic balance. The students left each potato stick in one of the three different liquids for 5 hours:i. distilled water. ii. dilute sodium chloride solution. iii. concentrated sodium chloride solution. After 5 hours they measured the mass again and calculated the change in mass. 1. Predict which of the liquids would cause the largest decrease in mass of a potato stick. 2. After the experiment, the students noticed that the potato stick with the lowest mass was soft and floppy. Explain why the potato stick had become soft and floppy. 3. The students followed the same experimental procedure with boiled potato sticks and found no overall change in mass in any of the solutions. Suggest why the mass of the boiled potato sticks remained the same.

3 0
3 years ago
22. A piece of wood board contains approximately 6.76 X 1023 molecules of wood, C2H4920, how
Licemer1 [7]

Answer:

<h2>1.23 moles</h2>

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

n =  \frac{N}{L} \\

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

n =  \frac{6.76 \times  {10}^{23} }{6.02 \times  {10}^{23} }  =  \frac{6.76}{6.02}  \\  = 1.22923...

We have the final answer as

<h3>1.23 moles</h3>

Hope this helps you

5 0
3 years ago
Fe + CuCl2 mc009-1.jpg FeCl2 + Cu Which pair of substances are the products?
grigory [225]
Fe+CuCl2=FeCl2+Cu
reactants--->reaction products
7 0
3 years ago
Read 2 more answers
If the temperature of water increases as you heat it, the temperature is the independent variable.
Simora [160]
False

becuase the temperates is dependant on heat or cold sources
5 0
3 years ago
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