CHEMISTRY MIDDLE SCHOOL

a certain skin lotion is a fine mixture of water and various oils. this lotion is cloudy and cannot be separated into oil and water by filtration. moreover, it’s compon do not separate when left standing. what type of mixture is it

Answers

Answer 1
Answer:

The answer is solution because it cannot be separated or  colliod homogenous mixture which has all the components in the same phase.  emulsions or what ever idk your answer but that my best answer :3


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HIGH SCHOOL

What is the pH of blood, given the hydrogen ion concentration is 4.0 × 10-8M?

Answers

Clinically, a blood pH of 7.4 is considered a normal value. If the pH of the blood is lower than 7.4, it is shown that the blood is acidic, that you have acidosis or a lack of bases. If the pH of the blood is above 7.4, it is said that the blood is alkaline, that you have an alkalosis or excess of base.

For calculating pH of blood, we will use next equation:

pH = -log c(H⁺)

pH = -log(4.0x10⁻⁸)

pH = 7.4
HIGH SCHOOL

The most stable elements have an atomic number above 92. a. a high proton to neutron ratio.
b. a high binding energy per nucleon.
c. a low binding energy per nucleon

Answers

Answer: b) high binding energy per nucleon

Explanation: Most elements become unstable as their atomic numbers reach/pass the special 92 number. This is due to the imbalance between neutrons and protons in their nucleus. As the number of protons and neutrons increases, the neutron-proton ratio in the nucleus has to increase to offset any instability in the nucleus.

The binding energy per nucleon of an element is the amount of energy required to disassemble the nucleus of an atom into its fundamental components (protons & neutrons). A high binding energy indicates serious difficulties in disassembling an atom's nucleus. Meaning the atom is very stable as the energy to cause it to decompose radioactively is too high.

So, an atom with atomic number higher than 92 would be stable if it has a high binding energy per nucleon.

COLLEGE

For each of the following redox reactions in the, identify the oxidizing agent and the reducing agent. 2Na(aq)+2H2O(l)→2NaOH(aq)+H2(g)
C(s)+O2(g)→CO2(g)
2MnO−4(aq)+5SO2(g)+2H2O(l)→2Mn2+(aq)+5SO2−4(aq)+4H+(aq)

Answers

Anywhere between 5sogt2 and 776sogt2
HIGH SCHOOL

What is the term for an atom with an unequal number of protons and electrons? A. neutron
B. ion
C. noble gas

Answers

B. ion. i hope this helps

what is the term for an atom with an unequal number of protons and electrons?

ion

HIGH SCHOOL

What mass of kcl is needed to precipitate the silver ions from 15.0 ml of 0.200 m agno3 solution?

Answers

This type of reaction occurs in the method of argentometric titration. This methods involves a silver solution that displaces to bond with the chloride ions in the sample to yield the precipitate, Silver Chloride (AgCl). The reaction between Silver Nitrate and the Potassium Chloride yields Silver Chloride and Potassium Nitrate:

KCl + AgNO₃ → AgCl + KNO₃

The balanced equation shows 1:1 ratio for all substances. These stoichiometric coefficients are useful in our calculations. Let's compute the moles of AgNO₃:

0.200 mol  AgNO₃/L * (0.015 L) = 0.003 moles of AgNO₃

Since 1 mole of AgNO₃ is equivalent to 1 mole of KCl, then, it would also need 0.003 moles of KCl. Knowing that the molar mass of KCl is 74.55 g/mol, the mass would be

0.003 moles * 74.55 g/mol = 0.224 g of KCl
MIDDLE SCHOOL

Explain why, even though a collision may have energy in excess of the activation energy, what reaction may not occur ?

Answers

Activation energy is the energy needed to start a reaction, eg the flame needed to start ... Collisions may have enough energy to react yet not react if the orientation of the molecules is incorrect. Difficult to explain here without graphics, but basically of the molecules are facing the wrong way it won't happen.

MIDDLE SCHOOL

The individual dipole moments in ammonia (NH3) do not cancel each other out. What is the strongest force that exists between molecules of ammonia?​

Answers

Answer:

                    The strongest force that exists between molecules of Ammonia is Hydrogen Bonding.

Explanation:

                    Hydrogen Bond Interactions are those interactions which are formed between a partial positive hydrogen atom bonded directly to most electronegative atoms (i.e. F, O and N) of one molecule interacts with the partial negative most electronegative atom of another molecule.

                    Hence, in ammonia the nitrogen atom being more electronegative element than Hydrogen will be having partial negative charge and making the hydrogen atom partial positive. Therefore, the attraction between these partials charges will be the main force of interaction between ammonia molecules.

                  Other than Hydrogen bonding interactions ammonia will also experience dipole-dipole attraction and London dispersion forces.

HIGH SCHOOL

A circuit breaker is a switch that automatically opens a circuit if too much current flows through it. True

False

Answers

Yes, I believe that is true. 
COLLEGE

Which of the following specifies the correct reducing agent in the given redox reaction? View Available Hint(s) Which of the following specifies the correct reducing agent in the given redox reaction? A. Fe + Cu2+ → Fe2+ + Cu; reducing agent is Fe2+ B. 2 Na + Cl2 → 2 NaCl; reducing agent is Cl2 C. C + O2 → CO2; reducing agent is O2 D. NiO + CO → Ni + CO2; reducing agent is CO.

Answers

Answer:  :  reducing agent is CO.

Explanation:

a)

The oxidation state of copper reduces from +2 to 0, it is getting reduced. As gets reduced, it acts as an oxidising agent.

The oxidation state of iron increases from 0 to +2. Thus, it is getting oxidized. As gets oxidized, it acts as a reducing agent.

b.

The oxidation state of chlorine reduces from 0 to -1, it is getting reduced. As gets reduced, it acts as an oxidising agent.

The oxidation state of sodium increases from 0 to +1. Thus, it is getting oxidized. As gets oxidized, it acts as a reducing agent.

c.

The oxidation state of oxygen reduces from 0 to -2, it is getting reduced. As gets reduced, it acts as an oxidising agent.

The oxidation state of carbon increases from 0 to +2. Thus, it is getting oxidized. As gets oxidized, it acts as a reducing agent.

d.

The oxidation state of nickel reduces from +2 to 0, it is getting reduced. As gets reduced, it acts as an oxidising agent.

The oxidation state of carbon increases from +2 to +4. Thus, it is getting oxidized. As gets oxidized, it acts as a reducing agent.

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