CHEMISTRY HIGH SCHOOL

The elements carbon and sulfur are solids at room temperature. Can you reasonably predict that a compound of these two elements will also be a solid at room temperature?

Answers

Answer 1
Answer: Yes I think your write

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MIDDLE SCHOOL

How would global warming change the water cycle and the climate around bodies of water, like oceans and lakes? A)Warmer temperatures would cause in a drier, hotter climate.

B)Warmer temperatures would cause more precipitation and less run-off.

C)Warmer temperatures would cause more evaporation and more precipitation.

D)Warmer temperatures would cause more evaporation and much less ground water.

Answers

For someone who lives in the northern hemisphere: this is most likely to be the answer: (c) Warmer temperatures would cause more evaporation and more precipitation. This is also probably why hurricanes are more powerful nowadays.
Hello!

The answer is: C)Warmer temperatures would cause more evaporation and more precipitation.

Why?

Warmer temperatures around bodies of water like oceans and most lakes will alterate the temperature of the water. A temperature increment will be traduced in more evaporated water, which can be translated into more precipitations.

It's a negative aspect, especially when we there are coastal communities, this climate alteration will translate in extreme flooding, affecting in a really bad and dangerous way the coastal communities, but flooding is not the only affectation, in fact, this will make the climate out of control, while some can experiment extreme flooding, others will experiment extreme droughts.

Have a nice day!

HIGH SCHOOL

Terry is convinced that heating peanut butter will increase its mass so that it covers more bread. Is he correct?

Answers

No heating peanut butter does the opposite

COLLEGE

Solid Iron (III) reacts with oxygen gas to form iron (III) oxide, which is the compound we see when rust is present. Based on this information, which of the following is true?4Fe + 3O2---> 2Fe2O3A.4 moles of iron will need 2 moles of oxygen gas to fully reactB.12 moles of iron, if reacted completely, can produce 8 moles of iron (III) oxide.C.9 moles of oxygen can produce 9 moles of Iron (III) oxide D.6 moles of oxygen can react completely to produce 6 moles of iron (III) oxide.E.none of the above

Answers

Answer:

Option E is correct. none of the above is correct

Explanation:

Step 1: Data given

Solid Iron (III) = Fe^3+

iron (III) oxide = Fe2O3

Molar mass Fe = 55.845 g/mol

Molar mass Fe2O3 = 159.69 g/mol

Step 2: The balanced equation:

4Fe + 3O2 → 2Fe2O3

4 moles of iron will need 2 moles of oxygen gas to fully react

⇒ This is false 4 moles of iron will need 3 moles of oxygen gas to fully react

B.12 moles of iron, if reacted completely, can produce 8 moles of iron (III) oxide.

⇒ This is false: When 12 moles of iron completely react, we can produce 12/2 = 6 moles of Fe2O3

C.9 moles of oxygen can produce 9 moles of Iron (III) oxide

⇒ This is false; 9 moles of O2 can produce 6 moles of Fe2O3

D.6 moles of oxygen can react completely to produce 6 moles of iron (III) oxide.

⇒ This is false 6 moles of O2 will react completely to produce 4 moles of Fe2O3

E.none of the above

MIDDLE SCHOOL

Which is greater, the moons period of rotation or its period of revolution? A. the moons rotational period.

B. the moons revolution period around earth.

C. they are equal.

D. neither are known.

WILL MARK BRAINLIEST

Answers

C. they are equal

This is because it takes about the same amount of time for the moon to rotate around its axis that it does to rotate around the Earth.

Answer:

The answer is C. They are equal

COLLEGE

. If the following mixtures of two compounds are being separated by gas chromatography, which one of the compounds would be expected to elute from the column first (have the shortest retention time)? Consider boiling points that are only I or 2°C apart to be essentially identical. Consider compounds with the same functional groups to be identical in polarity if they differ by no more than a few carbons. Look up any necessary structures. Mixture Compound with the shortest retention time Polarity of the column packing a. ethyl acetate (bp 77°C) and ethyl butyrate (bp 120°C) polar nonpolar b, ethyl acetate (bp 77"C) and ethyl butyrate (bp 120°C) c. acetic acid (bp l 18°C) and n-butyl alcohol (bp 117c) polar d. sec-butyl alcohol (bp 100"C) nonpolar and ethyl propionate (bp 99c)

Answers

Answer:

a. Ethyl acetate.

b. Ethyl acetate.

c. N-butyl alcohol.

d. Sec-butyl alcohol.

Explanation:

In gas chromatography, the elution order depends of boiling point and polarity of compounds. The lower boiling point will elute first and the elution depends of kind of column you are using; if column is polar, non-polar compounds will elute first and vice versa.

a. ethyl acetate (bp 77°C) and ethyl butyrate (bp 120°C) polar:

As the structures of these two molecules just change in 2 carbons it is possible to consider that are the same polarity. Thus, we will see just boiling point, as ethyl acetate has lower boiling point will elute first.

b. ethyl acetate (bp 77°C) and ethyl butyrate (bp 120°C)  nonpolar

Again, we will consider the same polarity for both compunds and ethyl acetate will elute first because its boiling point

c. acetic acid (bp 118°C) and n-butyl alcohol (bp 117c) polar.

As boiling point are similar we will see polarity: Acetic acid is a carboxilic acid and n-butyl alcohol has just a OH group in tis structure, that means acetic acid is more polar. As column is polar, acetic acid will be more retained doing n-butyl alcohol elutes first.

d. sec-butyl alcohol (bp 100"C) and ethyl propionate (bp 99c) nonpolar

As boiling point are similar we will see polarity: Sec-butyl alcohol has just a OH group but ethyl propionate is an esther, that means sec-butyl alcohol is more polar. As column is nonpolar, the polar compound will elute first, that is sec-butyl alcohol.

i hope it helps!

MIDDLE SCHOOL

When you push a desk that doesn't move, A. sliding friction occurs.
B. static friction occurs.
C. rolling friction occurs.
D. fluid friction occurs.

Answers

B. static friction occurs.

Explanation:

When a body is pushed and it does not move, static friction has occurred.

Static friction is a type of friction that keeps a body at rest. It must be overcome before a body at rest can start moving.

  • An object in motion experiences a sliding friction.
  • Friction is generally defined as the resistance to motion of a body.
  • In fluids, it is generally experienced as the viscosity.
  • Static friction is the strongest of all the friction.

Learn more:

Friction brainly.com/question/7174363

#learnwithBrainly

COLLEGE

A zinc rod is placed in 0.1 MZnSO4 solution at 298 K. Write the electrode reaction and calculate the potential of the electrode. (EZ24/2 = -0.76V.)

Answers

Answer: The potential of electrode is -0.79 V

Explanation:

When zinc is dipped in zinc sulfate solution, the electrode formed is

Reduction reaction follows:  

To calculate the potential of electrode, we use the equation given by Nernst equation:

where,

= electrode potential of the cell = ?V

= standard electrode potential of the cell = -0.76 V

n = number of electrons exchanged = 2

   (concentration of pure solids are taken as 1)

Putting values in above equation, we get:

Hence, the potential of electrode is -0.79 V

MIDDLE SCHOOL

What could help a scientist determine the approximate age of the dinosaur age?

Answers

Answer:

It's determined by the layer of rock it is in.

Answer:

The ages of dinosaur fossils are determined by the layer of rock in which they are ... you can see the complete geologic column, how do scientists know it exists? ... laid down over 542 million years, for an average of 49,272 years per foot of rock. .... dinosaurs lived in shallow water because it would help support their weight

Explanation:

COLLEGE

What did GEM Anscombe stand for give a brief description?

Answers

Answer:

Explanation:

Anscombe is a philosopher who has approached contemporary themes, today enormously current, precisely in the ethical and social field, stimulating the development of virtue ethics as an alternative to utilitarianism, Kantian ethics and social contract theories. Anscombe argues that what we understand as a moral obligation, what we "must" do, is an obligation to God.

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