In order to separate two substances by fractional crystallization, the two substances must differ in which of the following?(A) solubility
(B) specific gravity
(C) vapor pressure
(D) viscosity
(E) freezing point

Answers

Answer 1

Answer:
I would say vapor pressure, but I could be wrong. Good luck ^^

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The chemical formula for aluminum hydroxide? is Al(OH)3. Which of the following is true about aluminum hydroxide?

Answers

Where are the choices?

Write the balanced equation for the reaction that occurs when methanol, CH3OH (I) is burned in air. What is the coefficient of methanol in the balanced equation? (A) 1 (B) 3 (C) 2 (D) 4 (E) 3/2

Answers

Answer:

Explanation:

Methanol is an organic compound which burns with oxygen to produce carbon dioxide and water.

$2CH_3OH_((l))+3O_2_((g))\rightarrow 2CO_2_((g))+4H_2O_((g))$

Multiply coefficients times subscripts for each element in the formula, We get that there are 2 number of atoms of the carbon, 8 number of atoms of the hydrogen, and 8 number of atoms of the oxygen on both sides of equation. Hence, it is balanced.

The coefficient of methanol from the balanced reaction is 2.

Match each molecular formula to the corresponding empirical formula. 1) C₄H₈O₂ 2) C₄H₁₂O₄ 3) C₂H₁₀O₂ A) CH₃O B) CH₅O C) C₂H₄O

Answers

So empirical formulas would be the most simplified version where the proportions of the elements are the most simplified version. The best way to think of this would be like a recipe. If you want to make one cake and it says use two eggs then when you want two cakes you use four eggs. Each element works similarly. 1) divide by two as the greatest common factor (GCF) between 4,8, and 2 is 2 making 1) simplify to C2H4O so 1) C4H8O2 is the molecular formula of C)C2H4O. Then for 2) C4H10O4 we think of the GCF again. Biggest factor or GCF between 4,12,and 4 is 4, so divide the numbers in C4H12O4 by 4 making CH3O which is choice A) CH3O making 2) the molecular formula of A). Lastly do the same thing but from process of elongation 3) would be the molecular formula of B) CH5O. :) hope this helps :)))

Final answer:

The molecular formula C4H8O2 corresponds to the empirical formula C2H4O, C4H12O4 corresponds to CH3O, and C2H10O2 corresponds to C2H5O.

Explanation:

In chemistry, an empirical formula represents the simplest whole-number ratio of atoms in a compound, while a molecular formula represents the actual number of atoms in a molecule of the compound. To match each molecular formula to the corresponding empirical formula, divide the subscripts in the molecular formula by their greatest common factor. Hence:

C4H12O4 matches with B) CH3O
C2H10O2 fits with C) C2H5O

Learn more about Empirical and Molecular Formulas here:

brainly.com/question/32469611

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What is something a scientific law and a scientific theory have in common? Responses
A Both are backed up by evidence and facts Both are backed up by evidence and facts)
B Neither can be proven correct Neither can be proven correct)
C Both make a statement about a scientific phenomenon Both make a statement about a scientific phenomenon0,
A Both answer "why")

Answers

A. Both are backed up by evidence and facts!
- scientific law is made up of evidence
and facts or not it wouldn’t be a law.
- scientific theories are also backed up!
You need to have facts in order to
make it into a theory.

- it’s important to know that scientific
theories can become scientific laws :)

____ Turns food into a new form: a form that cells can use. A chemical change. B grinding. C physical change. D mixing. Why

Answers

The correct answer is A. Chemical change turns food into a new form, a form that cells can use. It happens because the food we eat cannot be processed by cells so several reactions inside our body allow chemical changes to the food we ate turning them to usable compounds for our cells.

Water is intitally present in a state where its molecules are far apart. During a change of state it’s molecule slow down which change of state has most likely taking place

Answers

Molecules will move faster and spread apart on warmer temperatures The colder it get the slower the molecules move so naturally those water molecules are on the path to freezing

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