what is the total number of joules released when a 5.00 gram sample of water changes from liquid to solid at 0°C ?

Answers

Answer 1

Answer: The heat associated with a change of physical state of a system is: $Q = m\cdot l$ (being "l" the latent heat of state change).

$Q = 5\ g\cdot 334(J)/(g) = \bf 1,67\cdot 10^(3)\ J$

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How to name alkane using iupac system

Answers

Naming an alkane through the IUPAC system is pretty simple
so all it is is (prefix for number of carbon) + ane
For the first four in this homologous series you have
Meth- 1 carbon
Eth- 2 carbons
Pro- 3 carbons
But- 4 Carbons
Onward you use the prefixes you know such as Pent, Hex, Hept, Oct, Non, Dec

So for an alkane with 3 Carbons it would be Propane, with 4 - Butane with 8- Octane etc.

What is the level of co2 in solo (soft drink)?

Answers

The fizz in a soda is caused by the carbon dioxide dissolved in the liquid. The amount of carbon dioxide dissolved in the a solo can not be found in the internet. This might be a secret of the company and it is only them who knows this but surely the level of CO2 is still in a safe for consumption level.

Examine the graph below.Choose which of the following is NOT true.

Absolute zero on Kelvin scale is -273°C.
Liquefaction of the gas occurs at approximately -155°C.
Condensation occurs at 0°C.
The gas follows a linear relationship between volume and temperature.

Answers

Answer : The incorrect option is, Condensation occurs at $0^oC$ .

Explanation :

Absolute zero on Kelvin scale is $-273^oC$ .

This statement is correct because at $0K$ the temperature in degree Celsius will be, $0K=0-273=-273^oC$

Liquefaction of the gas occurs at approximately $-155^oC$ .

This statement is correct. From the given graph the liquification of gas occurs at $-155^oC$ .

The gas follows a linear relationship between volume and temperature.

This statement is correct. According to the Charles law, the volume of gas is directly proportional to the temperature of the gas. So, gas follow the linear relationship between the volume and temperature.

Condensation occurs at $0^oC$ .

This statement is incorrect because condensation occurs at $100^oC$ . and the condensation is a process in which the phase changes from the gaseous state to liquid state at constant temperature.

As we know that condensation is a reverse process of vaporization. Both the process occurs at constant temperature $100^oC$ .

Hence, the incorrect option is, Condensation occurs at $0^oC$ .

Obviously from the graph, the relationship is linear. Charle's laws also say that so that one can be eliminated. Also using the points on the graph, abolute 0 is -273 and liquefication occurs around -155. That sets the answer to Condensation occurs at 0

What sample size (grams) of Na3PO4 (FW 164.00) known to be 50.00% pure should be used to consume exactly 40.00 mL of 0.1000 M HCl to reach the 2nd end point

Answers

Answer:

0.109 g.

Explanation:

Equation of the reaction:

Na3PO4 + 3HCl --> 3NaCl + H3PO4

Number of moles of HCl = molar concentration × volume

= 0.1 × 0.04

= 0.004 mol.

By stoichiometry, 1 mole of Na3PO4 neutralises 3 moles of HCl. Therefore, number of moles of Na3PO4 = 0.004/3

= 0.0013 mol

Mass of Na3PO4 = molar mass × number of moles

= 0.0013 × 164

= 0.219 g

Since 50% of Na3PO4 was present in the sample. Let 100 g be the total mass of the substance

= 0.219 × 50 g/100 g

= 0.109 g.

what are the three molecules that are attached to the plasma membrane, and what are their roles/ functions?

Answers

Answer:

Ans:

*Carbohydrates

*Proteins

*Cholesterol

Explanation:

The plasma membrane is a structure that has several distinct roles in the cell

The plasma membrane is mainly composed of the phospholipid Bilayer, which is a layer of two sheets located in the internal and external parts. The Phospholipids are said to be Amphipathic because they have both properties of Hydrophobic and hydrophilic

*The Carbohydrate Molecules attach to the Plasma Membrane such as to the lipids and Proteins:

when They attach to the Proteins, they are known as glycoproteins, and they help in cell recognition, when they attach to the lipids, they are known as Glycolipids

*Protein Molecules play an important role in transport system such as Carrier Proteins

*Cholesterol Molecules help in balancing the Fluidity of the plasma membrane

hope this was of use

Help please more points1 Change 9.0 x 10^7 from scientific to standard notation

2 Change 3.2 x 10^-5 from scientific to standard notation

3 Which types of measurements are appropriate for scientific notation? *

The speed of light

The speed of a snail

The speed of your car

4 Write 0.0000000000372 grams in scientific notation. Then convert to SI base units.

5 Write 45,000,000,000 kilometers in scientific notation. Then convert your answer to SI base units

6 A bulb thermometer gives an indoor temperature reading of 21 degrees Celsius. A digital thermometer in the same room gives a reading of 20.7 degrees Celsius. Which devise is more precise? Explain.

Answers

Answer:

The answers are below

Explanation:

1.- Change 9.0 x 10^7 from scientific to standard notation

Just move the decimal point 7 places to the right

90000000

2 Change 3.2 x 10^-5 from scientific to standard notation

Just move the decimal point 5 places to the left

0.000032

3 Which types of measurements are appropriate for scientific notation? *

The speed of light is appropriate

The speed of a snail isn't appropriate

The speed of your car isn't appropriate

4 Write 0.0000000000372 grams in scientific notation. Then convert to SI base units.

Just move the decimal point 11 places to the right

3.72 x 10 ⁻¹¹ grams = 3.72 x 10 ⁻¹⁴ kg

5 Write 45,000,000,000 kilometers in scientific notation. Then convert your answer to SI base units

Just move the decimal point 10 places to the left

4.5 x 10 ¹⁰ km = 4.5 x 10¹³ m

6 A bulb thermometer gives an indoor temperature reading of 21 degrees Celsius. A digital thermometer in the same room gives a reading of 20.7 degrees Celsius. Which devise is more precise? Explain.

I think the digital thermometer is more precise because it can measure decimals, then the reading is closer to the right temperature. The other thermometer can't read decimals.

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