Number of
Protons
Number of
Neutrons
Atomic
Number
Mass
Number
Element
(symbol)
А
7
B.
15
с
D
E
26
56
F.
Using the periodic table, complete the table to describe each atom. Type in your answers.
A
B
с
N
D

The pH value will be equal to 3.29 at the equivalence point.

Titration is the laboratory method that is performed to determine the concentration of the analyte. An indicator is used to know the equivalence point.

Given the concentration of HBr = 0.12 M

The concentration of ammonia = 0.12 M

The value of Kb for ammonia = 1.8 ×10⁻⁵

The chemical reaction is :[tex]NH_3 + HCl \longrightarrow NH^+_4 + Cl^-[/tex]

For the ammonia:      NH₃     NH₄⁺          H⁺

Initial conc.:               0.12 M     ----          -----

Change:                      - x            + x          +x

At equilibrium:         0.12-x           x            x

The acid dissociation constant :[tex]K_a =\frac{[NH_4][H^+]}{[NH_4^+]}[/tex]

[tex]\frac{K_w}{K_b} =\frac{[NH_4][H^+]}{[NH_4^+]}[/tex]

[tex]\frac{1\times 10^{-14}}{1.8\times 10^{-5}} =\frac{(x)(x)}{(0.12-x)}[/tex]

[tex]5.56\times 10^{-10}=\frac{x^2}{0.12-x}[/tex]

x² + 5.56× 10⁻⁵ x- 46.33 × 10⁻¹⁰ = 0

x = 4.57 × 10⁻⁵

The concentration of hydrogen ions = 4.57 × 10⁻⁵

The pH value = - log [H⁺]

pH = -log [4.57 × 10⁻⁵]

pH = 3.29

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Answer:

0.11M

Explanation:

What is the Molarity of a Ca(OH)2 solution if 30.0mL of

the solution is neutralized by 26.4mL of 0.25M HCI solution?

1L (1000 ml) of the HCl contains 0.25 moles of H ion

26.4 ml contains ( 26.4 X0.25/1000) moles of H ion ion

=0.0066 moles H ion

2HCl +Ca (OH)2-----> 2H2O +CaCl2

SO 2 H IONS NEUTRALIZE 1 Ca(OH)2 MOLECULE

00066 moles H ion neutralize 0.0033 moles Ca(OH)2

the 0.0033 moles are distributed over 30 ml, so the concentration of the

Ca(OH)2 IS 0,0033/(30/1000) =0.11 moles/liter or 0.11M

Answer:

V1/T1 = V2/T2

we must convert temperature from °c to kelvin

so T1= -20+273.15=253.15

and T2 = 60 +273.15= 333.15

0.215/253.15= V2/333.15

V2= 0.28L

hence, volume increases a little bit

Answer: 1000 kg * m / s

Explanation:

momentum is equal to mass times velocity!

50 times 20 is

1000

so momentum is 1000 kg * m/s

Answer: C. the saturation vapor pressure is lower near ice crystals than it is near supercooled droplets

The Bergeron process causes cloud droplets to grow because,  the saturation vapor pressure is lower near ice crystals than it is near supercooled droplets.

Physical transformations from a cloud of extremely small droplets to much bigger precipitation-sized particles that fall to the earth require a number of intricate and poorly understood physical processes.

The process of collision and coalescence, in which colliding droplets expand by merging together or coalescing, is how droplets form in warm clouds, those that solely contain liquid water.

Larger droplets pass through tiny droplets more quickly because they descend at a faster rate than the smaller ones. Strong updrafts (rising air currents) can produce cloud raindrops, just like hail, since they let heavier drops to stay suspended in the cloud.

Bergeron's process causes precipitation-sized particles to develop in cool clouds. Hence, option C is correct.

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Answer:

1) Organ

2) Organism

3) Organ System

4) Tissue

5) Cell or Tissue (im not sure)

6) Organism

7) Organ

8) Organism

9) Organism

Answer: the answer is molecules

A molecule is the smallest particle of a covalent compound that still has the properties of the compound.

Answer:

Friction

Explanation:

the resistance that one surface or object encounters when moving over another.

Answer:How do you determine the name of an element using protons, neutrons, and electrons?

   By knowing the number of protons, you know the atomic number. If you know the atomic number you know which element it is in the Periodic Chart. A good Periodic chart should give you enough information to determine the name of the element.

Explanation:

please mark me as brainliest

Answer:

safe? I guess it to me

Answer:

I think c.

Explanation:

I am not sure tho

Answer:

id say oxigan

Explanation:

i dont realy know but if im rong correct me

Answer:

Oxygen

Explanation:

Sound energy vibrates atoms andecause of this phenomenon, sound moves at a higher speed through solids than through liquids. Sound moves at its slowest speeds through gases.   molecules of matter as it travels through a medium. The more tightly packed the particles of a medium, the faster sound energy will transfer through it.

Answer:

Iron, as well as iron alloys, rusts because of a chemical reaction known as oxidation. When iron is exposed to moisture or oxygen, oxidation occurs. During this chemical reaction, iron is converted into iron oxide

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Answer: D is mostly empty space

Explanation: Rutherford's model shows that an atom is mostly empty space, with electrons orbiting a fixed, positively charged nucleus in set, predictable paths. Found this with his gold foil experiment

Answer:

volume

Explanation:

Answer:

the molecular structure of y shows that it is solid

Explanation:

because in solid state atoms are tightly packed and they are attached to them closely

Answer:

b it controls the entry and exit of substances

This problem is stating a situation in which a solid object is fully immersed in a liquid and the buoyant force is larger that its weight, so that you need to discuss whether this is possible or not.

In general terms, it is necessary to keep in mind that when the buoyant force is larger than its weight, the object will float. On the other side, when the buoyant force is smaller than the weight, then the object will sink.

It means that it could be possible to have this scenario under specific conditions. Now, the Archimedes' principle can be applied with the following version:

[tex]F_B+W>m_{obj}*a\\\\\rho _{fluid}*V*g+m_{obj}*g>m_{obj}*a\\\\\rho _{fluid}*V-m_{obj}>m_{obj}*a[/tex]

It means that the object can move down the liquid if has a significant acceleration (could be external), even when the buoyant force is larger than the weight

Learn more:

Answer:

1.35 moles

Explanation:

Calculate how many

of potassium (K) are present in a sample of 8.12x10^23 atoms of K​

6.02 X 10^23 atoms are 1 mole.  how many 6.02 X 10^23 are in

8.12 X 10^23

divide 8.12 X 10^23 into sets of 6.02 X 10^23

(8.12 X 10^23)/(6.02 X 10^23) =1.35 moles

The candy coating of the M&M is made of sugar and colored dye. When water comes into contact with the sugary coating, the positive and negative charges in the water molecules pull on the negative and positive charges in the sugary coating, and the coating dissolves.

Answer:

An Atom

Explanation:

This is the smallest unit which still has the properties of an element.

Answer:

Electrical- light + heat

Explanation:

By turning on the light Electricity energy takes place which gives us light energy which generates heat

Answer:

Chlorine  Cl atomic # 17, atomic mass 35.453

Explanation:

My atomic mass is 35.453

Dmitri  Mendeleev discovered the Periodic Table using atomic mass

look  at your  periodic table

only ONE element has an atomic mass of 35.453

Chlorine  Cl atomic # 17, atomic mass 35.453

Answer:

Explanation:

30+38

so this is the isosotope of Zn  that weighs 68

-so Zn68