at standard pressure how do the boiling point and the freezing point of NaCl compare to the boiling point and freezing point of H2O

Answers

Answer 1

Answer: Usually in this context you would be referring to the boiling and freezing point of a NaCl solution (saltwater) compared to pure H_{2}O. Sematics would be different for NaCl compound itself, you would say melting and boiling point for a solid substance- and the temperatures would be very, very radical (high).
The boiling point of pure water is 100 degrees C (212 F), and the freezing/melting point is below 0 degrees C (32 F). For a salt water solution, the boiling point is raised and the melting point is lowered. This means that water will stay liquid for an increased range of temperature. Depending on the amount of NaCl solute in the water, the boiling and melting points may change a few degrees.

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Stoichiometry problems which give a known amount of one reactant and solve for an amount of product frequently state that there is "an excess" or "plenty" of the reactant(s) not given. (For example, in the equation 2Na + 2H2O → 2NaOH + H2, how many grams of sodium hydroxide are produced from 3.0 mol of sodium with an excess of water?) Why is it necessary to know that there is an excess of these reactant(s)?
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Suppose that a substance in a beaker is heated over a burner in a science lab. Which observation would most likely indicate that a chemical change has occurred in the substance?1) If the substance is a liquid or solid, an increase in temperature would indicate a chemical change.2) If the substance is a liquid, a change of some of the liquid to gaseous form would indicate a chemical change.3) If the substance is a solid, a change of some of the solid to liquid form would indicate a chemical change.4) If the substance is a liquid or solid, the production of an odor would indicate a chemical change.

Is hair abiotic or biotic

Answers

Hair is biotic factor because even though it may seem dead it is still a living factor on your body.

Answer:

Hair is an abiotic factor because it is actually not living.

Observe the nature changing around your home. You can observe plants, animals, and parts of your actual home as you begin to notice changes in matter. Collect data for two examples of changes in matter. Use the Changes in Matter observation questions to determine if your examples are physical or chemical changes.Your answer should include two examples, the types of changes observed, and evidence of how the examples were formed. You can use this format:

Example 1:

Type of Change:

Evidence:

Answers

Answer:

Example 1. One change I observed was when cooking, I needed to boil water. The water was later evaporated due to the increase of heat from the stove below the pot. Heat traveled and transferred from the stove to the pot then the water. This change is from liquid to gas.

Example 2. I was mixing sugar into my tea, the sugar dissolved into the tea. This is an example of dissolving a solid into a liquid. The tea took the properties of the sugar and turned the drink sweet.

Extra, taking a hot shower and steam leaves the shower. This change is of evaporation.

Explanation:

Hope this helps, even though it was late! <3 :)

How many moles of silver chloride are produced from 15.0 mol of silver nitrate

Answers

Answer: 15.0

Explanation:

1) The chemical formula of silver nitrate is AgNO₃

2) The chemical formula of silver chloride is AgCl

3) Therefore, by mass balance you know that all the atoms of Ag in AgNO₃ will en up at the AgCl. This is a mole ratio 1:1.

4) Since, there are 15.0 moles of Ag atoms in 15.0 moles of AgNO₃, you conclude, using the 1: 1 ratio, that 15.0 moles of AgCl are produced.

Silver chloride is AgCl, while silver nitrate is AgNO3. There is the same amount of AgNO3, so the silver from a sample of silver nitrate can produce the same amount of silver chloride. Therefore, this produces 15.0 moles of silver chloride.

Which volume of 2.0M NaOH(aq) is need to completely neutralize 24 milliliters of 1.0M HCl(aq)?(1) 6.0mL (2) 12mL (3) 24mL (4) 48mL

Answers

The answer is (2) 12mL. The reaction equation is NaOH + HCl = NaCl + H2O. So the mol number of NaOH is equal to HCl. The concentration of NaOH is twice of HCl so the volume of HCl is twice of NaOH.

Stars are formed from interstellar clouds because ofthe Law of Entropy
the Law of Universal Gravitation
the Law of Stellar Evolution
the Law of Propulsion

Answers

The answer is D. Stars are formed from interstellar clouds because of the Law of Universal Gravitation. The interstellar clouds are termed as nebula. When other stars dies a supernova occurs then the gravity from this pushes matter into the clouds until it cannot overcome the gravitational pull and it collapses which heats matter up forming a star.

Plz solve this i need helpprozac C17H18F3NO is a widely used antidepresent that inhibits the uptake of sertonin by the brain. how many molecules are in 3 grams of prozac?

Answers

Molar mass prozac

C17H18F3NO = 309.33 g/mol

1 mol -------------- 309.33 g
x mol -------------- 3 g

x = 3 / 309.33

x = 0.00969 mol

1 mol ------------- 6.02x10²³ molecules
0.00969 --------- y molecules

y = 0.00969 * 6.10x10²³

y = 5.83x10^21 molecules

hope this helps!.

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The word equation for the reaction between magnesium carbonate and hydrochloric acid is shown below.magnesium carbonate + hydrochloric acid = magnesium chloride + carbon dioxide + watersadiq added hydrochloric acid to magnesium chloride in a flaskSUGGEST THE PH OF HYDROCHLORIC ACID ?the carbon dioxide produced was bubbled through lime water.HOW WOULD THE LIME WATER CHANGE?

ASAP pleaseee and Thankyou