Compounds put together will form -a. elements.
b. mixtures.
c. atoms.
d. pure substances.

Answers

Answer 1

Answer: The correct answer is B. Compounds put together will form mixtures because compounds itself are pure substances which contains elements and atoms. Mixtures is a system that is made up of two or more substances or compounds which are not combined chemically.

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Which are functions of nucleic acids?Choose all answers that are correct.

A.
to defend against infection

B.
to provide structural support

C.
to carry genetic information

D.
to process information

Answers

i would go with b and c if you can choose both

In which solution will thymol blue indicator appear blue?(1) 0.1 M CH3COOH (3) 0.1 M HCl
(2) 0.1 M KOH (4) 0.1 M H2SO4

Answers

Answer: (2) 0.1 M KOH

Explanation:

Thymol blue is an universal indicator. Thymol blue has a blue color when in basic conditions (pH > 7), a green color in neutral conditions (pH =7), and a yellow color in acidic conditions (pH < 7).

pH or pOH is the measure of acidity or alkalinity of a solution. pH is calculated by taking negative logarithm of hydrogen ion concentration.

0.1 M $CH_3COOH$ , 0.1 M $HCl$ and 0.1 M $H_2SO4$ are all acidic in nature.

Thus thymol blue will appear blue in basic 0.1 M KOH.

In 0.1 M KOH, thymol blue indicator would appear blue.

student has calibrated his/her calorimeter and finds the heat capacity to be 14.2 J/°C. S/he then determines the molar heat capacity of aluminum. The data are: 25.5 g Al at 100.0°C are put into the calorimeter, which contains 99.0 g H2O at 18.6°C. The final temperature comes to 22.7°C. Calculate the heat capacity of Al in J/mol·°C.

Answers

Answer:

24.03 J/mol.ºC

Explanation:

For a calorimeter, the heat lost must be equal to the heat gained from water plus the heat gained from calorimeter, which has the same initial temperature as the water.

-Qal = Qw + Qc (minus signal represents that the heat is lost)

-mal*Cal*ΔTal = mw*Cw*ΔTw + Cc*ΔTc

Where m is the mass, C is the specific heat, ΔT is the temperature variation, al is from aluminum. w from water and c from the calorimeter. Cw = 4.186 J/gºC

-25.5*Cal*(22.7 - 100) = 99.0*4.186*(22.7 - 18.6) + 14.2*(22.7 - 18.6)

1971.15Cal = 1699.10 + 58.22

1971.15Cal = 1757.32

Cal = 0.89 J/g.ºC

The molar mass of Al is 27 g/mol

Cal = 0.89 J/g.ºC * 27 g/mol

Cal = 24.03 J/mol.ºC

What is the charge on an electron?

Answers

Answer

1.60217662 × 10-19 coulombs

Explanation:

Carbon can bond with other carbon atoms to produce cyclic hydrocarbon structures.TRUE

FALSE

Answers

Answer:

The answer is True

Explanation:

Cyclic hydrocarbons are organic compounds that consist of carbon and hydrogen atoms that bond to form rings or cyclic structures. The simplest are cycloalkanes, hydrocarbons formed by a closed carbon chain with all the simple bonds.

There is a very special group of cyclic hydrocarbons called aromatic hydrocarbons. Its name is due to the fact that the first to be discovered had pleasant smells. They all start from a basic structure that can be repeated many times. An example of this type of hydrocarbon is bancene.

The statement about "Carbon can bond with other carbon atoms to produce cyclic hydrocarbon structures" is true. Carbon can also bond with other four atoms because of its outer shell (valence shell) that has four electrons. This is the reason why organic molecules can be so large because of this bonding.

The combustion of a sample butane, C4H10 (lighter fluid) produced 2.46 grams of water. how much oxygen was used up in grams