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kow [346]
3 years ago
12

Read the list of substances. Spoon, Styrofoam cup, Scissors, Pencil Which substances are likely to float in water?

Chemistry
2 answers:
KIM [24]3 years ago
4 0

Explanation:

Density is defined as the mass present in a unit volume of a substance.

Mathematically,       Density = \frac{mass}{volume}

Since, density is proportional to mass. So, more is the mass of an object more will be its density and vice-versa.

It is known that density of water is 1 g/ml. And any substance that has more density than water will sink into water when added to it. Whereas a substance that has less density than water will float in water when added to it.

Out of the given options density of a styrofoam cup is the least.

Hence, we can conclude that styrofoam cup is likely to float in water.

gogolik [260]3 years ago
3 0
Styrofoam cup. That's all that can float in water.
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A solution contains 3.95 g of carbon disulfide (CS2, molar mass = 76.13 g/mol) and 2.43 g of acetone ((CH3)2CO, molar mass = 58.
Feliz [49]

Answer:

The solution is not ideal and shows a positive deviation from Raoult’s law since Psolution (experimental) > Psolution (actual).

Explanation:

Number of moles of CS2 = 3.95g/76.13gmol-1 = 0.0519 moles

Number of moles of acetone = 2.43g/58.08gmol-1 = 0.0418 moles

Total number of moles = 0.0937 moles

Mole fraction of CS2 = 0.0519/0.0937 = 0.5538

Mole fraction of acetone = 0.0418/0.0937 = 0.4461

From Raoult’s law;

PCS2 = 0.5538 × 515 torr = 285.207 torr

Pacetone = 0.4461 × 332 torr = 148.1052 torr

Total pressure = 285.207 torr + 148.1052 torr = 433.3 torr

6 0
3 years ago
The diagram below shows the energy conversions of the Krebs cycle, which is part of cellular respiration. The U-shaped
VLD [36.1K]

Answer:

i dont even know tbh jk i wont waste ur time unless nvm ok so the answer is The correct answer would be C.10. Krebs cycle is a part of cellular respiration that takes place in the mitochondria. Five energy conversions take place in one complete cycle of the Krebs cycle. These conversions lead to the formation of three molecules of NADH, one molecule of FADH₂ and one molecule of ATP.

Explanation:bc im superrr smart

8 0
3 years ago
Read 2 more answers
Name one manufactured device or natural phenomenon that emits electromagnetic radiation in each of the following wavelengths: ra
Bas_tet [7]
Radio - Radio station transmits radio wavelength which is received by the
Radio. 
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Microwaves - Microwave Oven to heat up foods. </span>

<span>IR (infrared) - TV remote Control, to transmit IR light to a sensor in the TV so it can do some functions like increasing the volume, changing the channel etc. </span>


<span>Visible light - Sunlight or Light Bulbs </span>

<span>Ultraviolet - UV Lamps for sun tan, for detecting forged money </span>

<span>X-rays - Chest X-ray machines, Backscatter Xray (body scanner in airport security)
</span>
Gamma rays - Gamma rays<span> Medical Equipment which are used to kill cancer cells, to sterilize medical </span>equipment<span> </span>
7 0
3 years ago
5.5x10² – 6.50x10'<br> Express the calculation in correct significant digits
OLga [1]

Answer:

6.15x10^2

Explanation:

Hello!

In this case, when performing mathematical operations with numbers in scientific notation, the first step is to write them in standard notation:

550 - 65.0

Thus, the result without any significant figures-based analysis is:

615.0

However, since 550 is significant to the ones and 65.0 to the tenths, we need to round the result to the bigger significance, in this case to the ones; therefore the appropriate result would be:

615

That in scientific notation would be:

6.15x10^2

Best regards!

5 0
3 years ago
7.The equation below shows a process that occurs in all green plants.
pychu [463]

Answer:

Ⓓ The process follows the law of conservation of mass and energy is found in the product

Explanation:

This question depicts PHOTOSYNTHESIS, which is the process employed by green plants to manufacture their food in form of sugars (glucose). The general equation, which was given in the question is as follows:

6CO2 + 6H2O + energy → C6H12O6 + 6O2

This chemical reaction follows the LAW OF CONSERVATION OF MASS, which states that the amount of matter in reactant must equate that of the product. In this case, each element contains the same number of atoms in both reactant side and product side.

Also, energy is contained in the product but stored in the chemical bonds of the glucose molecule formed.

6 0
3 years ago
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