CHEMISTRY COLLEGE

How many molecules are shown in the chemical formula pictured? H3PO4A) 1
B) 3
C) 4
D) 7

Answers

Answer 1
Answer:

Answer

A(1)

Explanation:

If you don't see a coefficient, which is the big number in front of the formula, then it's only one molecule.

Example of coefficient

4H3PO4  

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Identify the true statements about introns.a- they code for polypeptide proteinsb- they have a branch site located 20 to 50 nucleotides upstream of the 3' splice sitec- they end with the nucleotides AG at the 3' endd- they begin with the nucleotides GU at the 5' ende- they tend to be common in bacterial genes
Be sure to answer all parts. Industrially, hydrogen gas can be prepared by combining propane gas (c3h8) with steam at about 400°c. The products are carbon monoxide (co) and hydrogen gas (h2). (a) write a balanced equation for the reaction. Include phase abbreviations. (b) how many kilograms of h2 can be obtained from 8.31 × 103 kg of propane
For each set of dilutions (bleach and mouthwash), the first tube contained a 1:11 dilution (0.5 mL of agent was added to 5.0 mL of nutrient broth). What was the dilution of the MIC for the mouthwash and the bleach? Hint: You will have to calculate the dilution of each tube 2 – 4.
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What rules can you use to tell how many protons, neutrons and electrons make up an atom or ion?

Answers

The rule used for the determination of the protons, electrons, and neutrons has been the equal number of protons and electrons, while the number of the neutrons has been the difference in the atomic mass and the protons.

The atom has been the smallest particle that has comprised of electrons, protons, and neutrons as the subatomic particle. The neutrons and protons in the atoms have consisted within the nucleus. The electrons in the atom are revolving around the nucleus.

The atoms have been consisted of an equal number of protons and electrons, while the number of neutrons has been the difference in the atomic mass and the protons.

The ions have been formed with the loss or gain of the electrons by the atom in the terms of valence electrons to complete its octet.

For more information about the electrons and protons, refer to the link:

brainly.com/question/803445

Answer:

Explanation:

This question appears incomplete, however

The number of protons of an element/atom (atomic number) can be determined by checking for the position of the element on the periodic table. This is because elements are arranged according to there atomic number on the periodic table.

The number of electrons of any element (of a neutral atom) is equal to the number of protons of the same element.

The number of neutrons of an element/atom is determined by subtracting the atomic number of the element from it's mass number. Hence, mass number is the addition of the atomic number and the number of neutrons.

Ions are charged particles that have the same number of protons and neutrons as there parent atoms. Hence, they have different number of electrons when compared to there specific parent/neutral atom.

A negatively charged atom has more electrons than it's original atom. For example, fluoride ion (F⁻) has 10 electrons while fluorine atom has 9 electrons (meaning fluoride ion has one more electron than it's parent fluorine). The increase is dependent on the number "attached" to the charge. A positively charged atom has less electrons than it's original atom. For example, calcium ion (Ca²⁺) has 18 electrons while calcium atom has 20 electrons (meaning the calcium ion has 2 electrons less than it's parent calcium atom). As said earlier, the decrease here is also dependent on the number "attached" to the charge.

Suppose you perform a titration of an unknown weak acid solution. You start with 4.00 mL of the weak acid and find that it takes 14.2 mL of 0.0500 M NaOH to reach the equivalence point. What is the concentration of the unknown weak acid solution

Answers

Answer:

0.1775 M

Explanation:

The reaction that takes place is:

  • HA + NaOH → NaA + H₂O

Where HA is the unknown weak acid.

At the equivalence point all HA moles are converted by NaOH. First we calculate how many NaOH moles reacted, using the given concentration and volume:

  • 0.0500 M NaOH * 14.2 mL = 0.71 mmol NaOH

That means that in 4.00 mL of the weak acid solution, there were 0.71 weak acid mmoles. With that in mind we can now calculate the concentration:

  • 0.71 mmol HA / 4.00 mL = 0.1775 M

A solution of Na2CO3 is added dropwise to a solution that contains 1.05×10−2 M Fe2+ and 1.60×10−2 M Cd2+. What concentration of CO32− is need to initiate precipitation? Neglect any volume changes during the addition.

Answers

The Ksp of FeCO₃ is 3.45x10-11 and the Ksp of CdCO₃ is 8.7x10-12.

What is Ksp?

Ksp is a mathematical expression used to predict the behavior of a saturated solution. It is an abbreviation of the term “solubility product constant”, and is derived from the thermodynamic equilibrium equation that exists between a solid and its dissolved ions in a solution. Ksp is used to predict the solubility of a given ionic compound, and is a measure of the maximum amount of solute that can be dissolved in a given solvent at a given temperature and pressure.

To initiate precipitation, the concentration of CO²⁻₃ must be greater than or equal to the solubility product of the least soluble salt, which is CdCO₃.
Therefore, the concentration of CO²⁻₃ must be greater than or equal to 8.7x10-12 M.

To learn more about Ksp
brainly.com/question/25134328
#SPJ1

Need help I don't remember what to do?

Answers

I'm just doing the ones that you don't have numbers already for.
2.) just leave it alone and it's correct
3.) Mg + 2AgNo3 --> Mg(No3)2 + 2Ag
5.) just leave it alone and it's correct
8.) 10C3H8O3 + 15O2 --> 30CO2 + 4H2O
10.) P4 + 6Br2 --> 4PBr3
12.) 2FeCl3 + 6NaOH --> 2Fe(OH)3 + 6NaCl
13.) 2CH3OH + 3O2 --> 2CO2 + 4H2O
14.) 2Al + 3Cu(NO3)2 --> 2Al(NO3)3 + 3Cu
15.) 3CaCl2 + 2K3AsO4 --> Ca3(AsO4)2 + 6KCl
16.) 2NH3 --> N2 + 3H2
17.) 2H3PO4 + 3Ba(OH)2 --> Ba3(PO4)2 + 6H2O
19.) Mg3N2 + 6H2O --> 3Mg(OH)2 + 2NH3
I hope this helps you!!

1.Potato plants carry out photosynthesis to make molecules of glucose. If they can’t use all the glucose they make in a day, they store it as starch. Explain how they convert glucose to starch.2.A few days later, a potato plants has not made enough glucose to feed itself for the day. Explain how it gets glucose from starch it is storing. (Include the name of the process it uses)

Answers

Answer:

Question 1

Answer ;

in photosynthesis process, the plant have the ability to absorb the light using their pigment called as chlorophyll.  this light energy with the help of many enzymes will help the conversion of CO2 and water in to glucose  which is then transported to different parts of the plants for its usage in different cellular processes and growth. The excess of glucose which is not utilized and metabolized immediately is converted to complex sugar molecules and stored in the plant in the form of Starch to fulfill the future needs.

Question 2

Answer ;

starch are stored for many purpose. the pathway used to create and store glucose in the form of starch is a reversible process. if potato plant have not made enough glucose for the day to feed itself, the starch which was stored will be catabolized using different cellular enzymes in to glucose.the starch which is stored is broken down and needed in those conditions and days when there is no sunlight or cloudy weather for days.

Identify the characteristics that describe how human proteins are assembled. Check all that apply.

Answers

Answer:

Hi,

The assembling of proteins starts with the attachment of m RNA to the ribosomes in the cytoplasm. Each of the ribosome read the code in the m RNA from “start” to “ stop” choosing the specific amino acid building block and removing the unwanted growing protein. The ribosome performs this process in 0.02 seconds and with this rate it is possible for the cell to perform assembling of small protein such as insulin.

Best wishes!

Answer:

A, D, E, F

Explanation:

just took it on edge
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