Help and explain step by step if you can!

Answer:

Copper and silver should work.

Explanation:

Answer:

7.0

Explanation:

In the titration of a weak acid and a strong base, the pH or equivalence point will be greater than 7. Therefore, option D is correct.

The pH of the solution can be described as the negative logarithm of hydrogen ions (H⁺) concentration. Mathematically, the pH value is generally inversely proportional to the hydrogen ion's concentration.

pH = -log ([H⁺])

In chemistry, the pH scale is used to determine the basicity or acidity of an aqueous solution. Acidic solutions can be calculated to have lower pH values than alkaline solutions.

The pH scale has a scale of 0 to 14 while pH 7.0 is neutral. A low pH of about 1 or 2 is acidic and a high pH of 12 or 14 is basic.

The pH value of the weak acid and a strong base solution will be greater than seven because the conjugate base of a weak acid is weakly basic.  Therefore, the expected pH from a weak acid and a strong base if equal concentrations will be greater than 7 can be 10.4.

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#SPJ2

Answer:

Explanation:

Given species;

  Beryllium

  Calcium

   Sulfur

Unknown:

Give the symbol, number of neutrons and the mass number

Solution:

The symbols of the species are;

    Beryllium  -   Be

    Calcium     -  Ca

     Sulfur       -  S

Number of neutrons:

    Beryllium - 5

   Calcium    - 20

   Sulfur       -  16

Mass number :

  Beryllium - 9

    Calcium - 40

     Sulfur -    32

Answer:

Salt and sand can be separated by mixing the two substances with water. The salt will dissolve into the water, while the sand will settle at the bottom of the mixture.

Explanation:

answer:

tehehehe mix red and white!

Explanation:

Answer:

Red and white mixed together makes pink :)

Explanation:

Answer:

This question is incomplete

Explanation:

This question is incomplete, however, the element that has 52 electrons only is Tellurium (Te) and when the electronic configuration of elements with more than 52 electrons are written, the 52nd electron is indicated/paired the same way the 52nd electron of Te is indicated/paired. Hence, while writing the electronic configuration of Te, it is written as

[Kr] 4d¹⁰ 5s² 5p⁴ where [Kr] is the electronic configuration of krypton. Based on this, we can deduce that the 52nd electron will be in the first orbital of the P subshell (as attached in the picture). This is because when indicating the electrons in the subshell, one electron will be spread across each orbital and if any electron is still remaining, it will be added starting from to the first orbital of the subshell, however no two electrons in an orbital in a subshell can have the same spin and hence must face opposite direction based on pauli's exclusion principle (as seen in attached); thus for the 5p-orbital of elements with 52 or more electrons, when one electron each is represented in each box (3 boxes in total) in the 5p-orbital, the remaining electron is paired with the the first electron in the first box of the 5p-orbital

Answer:

False,

but it depends of the meaning of the word particle

Explanation:

even if it's a metallic bounding, or if it's very solid, has low temperature, and has a very high electrostatic force of its atoms, its particles will have some kind of movement, because it has temperature, that means that it has some kind of Agitation

Particles in a block of iron are stationary. That is true.

The particles in a block of iron are stationary depending on the temperature of the block of iron. Since the block of iron is a solid and particles of a solid tend to have low kinetic energies at low temperatures, then at low temperatures, the particles in the block of iron would be stationary.

So, Particles in a block of iron are stationary. That is true.

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Answer:

This question is incomplete

Explanation:

This question is incomplete. However, generally hydronium ion (H₃O⁺) is produced when hydrogen ion (usually from an acid) is attracted to the negative pole of water (which is the oxygen part).

To determine the ratio in this case is simple, the ratio of the new to the original hydronium ion concentration is;

the calculate new concentration of hydronium ion, [H₃O⁺]

pH = -log[H₃O⁺] hence,

[H₃O⁺]  = log⁻¹pH (meaning antilog of pH)

Kindly note that the pH to be used here is 2 + the original pH given

Hence, if the original pH given is 2

The new [H₃O⁺] will be 4

[H₃O⁺] = log⁻¹ 4

= 10000

Same formula should be used to determine the concentration of the original hydronium ion concentration using the original pH given.

Hence, [H₃O⁺] = log⁻¹ 2

= 100

The ratio of the new to the original hydronium ion concentration will be

10000:100

100:1

The ratio of the new to the original hydronium ion concentration when the pH of a solution increases by 2 is; 1: 100

The Hydroxonium ion is similar to the hydrogen ion concentration and is written as;. {H3O+¹}.

The formula for calculating the pH of a solution is;

When the pH increases by 2 units; (e.g., from 3 to 5).

Therefore; By evaluation;

Therefore; 10-⁵/10-³ = 10-².

In essence; the ratio of the new to the original hydronium ion concentration is; 1 : 100

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Answer:

European Union was on grand committee

Answer:

European Union

Explanation:

hehe

Answer:

b

Explanation:

The stone will feel warmer than the glass after 20 minutes.

This can be defined as a process of heat transfer which involves direct contact between the objects.

The stone and the lamp in contact with each other means heat will be transferred to the stone thereby making it warmer and the reason why option B was chosen as the most appropriate choice.

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Answer:

screwdriver,fork,key,screw

Explanation:

the key is made of either copper or a different metttal or conducter just like the other objects are made of a semiconducting material

Answer:

[tex]2Z^+ (aq) + SO^{2-} _{4} (aq) = Z_{2} SO_{4}[/tex]

Explanation:

The reaction between Z(aq) and Na2SO4 forming a brown ppt shows that the product formed from this reaction is a solid. and also it can be seen that Z+ is a monocationic while SO4 is dianionic, hence molecules (2) of Z+ will combine with (1) molecule of SO4

below is the balanced chemical equation for this reaction

[tex]2Z^+ (aq) + SO^{2-} _{4} (aq) = Z_{2} SO_{4}[/tex]

Answer:

In the International System of Units (SI), the standard unit of volume is the cubic metre (m3). The metric system also includes the litre (L) as a unit of volume, where one litre is the volume of a 10-centimetre cube.

Explanation:

i think

Answer:

They have the same number of protons, but a different number of neutrons.

Explanation:

All atoms of the same element have the same number of protons, however, they don't necessarily have the same number of neutrons. If atoms of the same element have different numbers of neutrons, they are isotopes of one another. An example is carbon-12 and carbon-13. Carbon-12 has 6 protons and 6 neutrons. Carbon-13 has 6 protons and 7 neutrons. They are isotopes.

Answer:

the color black absorbs energy which in turn will make u hot. the color white reflects energy which in turn will keep u cool

Explanation:

Answer:

The answer is c

Explanation:

The answer is c because dark colored clothes absorb more electromagnetic waves than a white t-shirt because lighter only reflects

Answer: Two reactants combine to form one product.

Explanation: :/

Answer:

10.88g

Explanation:

The main components of dry air are N2 at 78.08% vol , O2 at 20.95% vol, and Argon at 0.934% vol. We will not be concerned with the lesser components because they will not have a significant effect on our answer.  First we need to find the molar mass of dry air so we use the formula Mass = (percent mass * molar mass of gas) we then plug and chug: MM = (0.7804 * 28.01) + (0.2095 * 31.99)+(0.00934 * 39.95) which gives MM = 28.93 mol/gram

Now that we have the molar mass we use conversion factors to get 0.376g / 28.93mol = 10.88g

the answer is atomic number

Answer:

atomic numbers

Explanation:

In order for two atoms to be different, they have to have a different number of protons. Protons are represented by the atomic number. Thus, atoms of two DIFFERENT elements must have different atomic numbers.

I took the test and got 100%

Hope this helps!

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\[/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question

N = 1.204 × 10²⁴ atoms of gold

We have

[tex]n = \frac{1.204 \times {10}^{24} }{6.02 \times {10}^{23} } \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

12.78 kJ

Explanation:

The correct balanced reaction would be

[tex]2CH_3OH\rightarrow 2CH_4+O_2\Delta H=252.8\ \text{kJ}[/tex]

Mass of methanol = [tex]3.24\ \text{g}[/tex]

Moles of methanol can be obtained by dividing the mass of methanol with its molar mass [tex](32.04\ \text{g/mol})[/tex]

[tex]\dfrac{3.24}{32.04}=0.10112\ \text{moles}[/tex]

Enthalpy change for the number of moles is given by

[tex]\dfrac{\text{Number of moles of methanol in the reaction}}{\text{Enthalpy change in the reaction}}=\dfrac{\text{Number of moles in 3.24 g of methanol}}{\text{Enthaply in change in the mass of methanol}}[/tex]

[tex]\\\Rightarrow\dfrac{2}{252.8}=\dfrac{0.10112}{\Delta H}\\\Rightarrow \Delta H=\dfrac{0.10112\times 252.8}{2}\\\Rightarrow \Delta H=12.781568\approx 12.78\ \text{kJ}[/tex]

The change in enthalpy is 12.78 kJ.

When 3.24 g of CH₃OH are decomposed, the change in the enthalpy is 12.8 kJ.

Let's consider the following thermochemical equation.

2 CH₃OH ⇒ 4 CH₄ + O₂    ∆H = 252.8 kJ

First, we will convert 3.24 g of CH₃OH to moles using its molar mass (32.04 g/mol).

[tex]3.24 g \times \frac{1mol}{32.04g} = 0.101 mol[/tex]

According to the thermochemical equation, 252.8 kJ are absorbed when 2 moles of CH₃OH react. The enthalpy change when 0.101 moles of CH₃OH react is:

[tex]0.101 mol \times \frac{252.8 kJ}{2mol} = 12.8 kJ[/tex]

When 3.24 g of CH₃OH are decomposed, the change in the enthalpy is 12.8 kJ.

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Answer:

a momentum

Explanation:

because it appears Earth's surface

On approaching the earth's surface, the momentum of the object increases. Thus, option A is correct.

The momentum can be defined as the velocity of the specific mass of the object. The stopping force has the force acting in the opposite direction of the force applied to reduce the acting force.

When an object has been approaching the earth's surface there has been an increase in the mass of the object with respect to the gravity force. The increase in mass results in the increase in the momentum of the object.

Thus, on approaching the earth's surface, the momentum of the object increases. Thus, option A is correct.

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Answer:

1.71x10²⁷

Explanation:

If we sum 1/2 of (3) + 1/2 of (1):

1/2 (3.) C(s) + 1/2O₂(g) ⇌ CO(g), K₃ = √2.10×10⁴⁷  = 4.58x10²³

1/2 (1)   1/2CO₂(g) + 3/2H₂(g) ⇌ 1/2CH₃OH(g) + 1/2H₂O(g), K₁ = √1.40×10² = 11.8

C(s) + 1/2O₂(g) + 1/2CO₂(g) + 3/2H₂(g) ⇌ 1/2CH₃OH(g) + 1/2H₂O(g) + CO(g)

K' = 4.58x10²³ * 11.8 = 5.42x10²⁴

+1/2 (2):

1/2 CO(g) + 1/2H₂O(g) ⇌ 1/2CO₂(g) + 1/2H₂ (g), K = √1.00×10⁵ = 316.2

C(s) + 1/2O₂(g) + H₂(g) ⇌ 1/2 CHO₃H(g) + 1/2CO(g)

K'' = 5.42x10²⁴* 316.2 =

Answer:

5.296 Moles

Explanation:

I literally found this answer in one of my old notebooks if you need I can try to explain it so you can understand.

Answer : The correct answer is option (3) [tex]5.68\times 10^{-19}J[/tex]

Explanation: Given,

Wavelength =  350 nm = [tex]350\times 10^{-9}m[/tex]         [tex](1nm=10^{-9}m)[/tex]

Now we have to determine the energy of photon.

Formula used:

[tex]E=\frac{hc}{\lambda}[/tex]

where,

E = energy  of photon

h = Planck's constant =  [tex]6.63\times 10^{-34}J.s[/tex]

c = speed of light =  [tex]3\times 10^{8}m/s[/tex]

[tex]\lambda[/tex] = wavelength of photon

Now putting all the given values in this formula, we get:

[tex]E=\frac{(6.63\times 10^{-34}J.s)\times (3\times 10^{8}m/s)}{350\times 10^{-9}m}[/tex]

[tex]E=5.68\times 10^{-19}J[/tex]

Therefore, the energy of photon is, [tex]5.68\times 10^{-19}J[/tex]

Answer:

Must contain isolated both isolated atoms and molecules

Explanation:

There is very little intermolecular forces of attraction between atoms and molecules of a gas.

Hence in a gas mixture; We mostly find isolated atoms and molecules with minimal interaction with each other, hence the answer.

Answer:

hope it  helps you❤❤❤

Explanation:

The physical change would be the sugar dissolving in water because no reaction is occurring.

sugar dissolving in warm water is an example of physical change.

physical change is doesn't alter the composition or the identity of the substance .

That's mean when you dissolves sugar in water, after a while the object will be the same which mean that the component doesn't change

Answer:

Al⁺³ , O⁻²

Explanation:

This is an oxidation reduction reaction (Redox).

Chemical reaction:

4Al + 3O₂   →    2Al₂O₃

The oxidation state on Al and O on left hand side is zero. On right hand side Al is present in +3 oxidation state while O is present in -2 oxidation sate.

Oxygen is reduced and Al is oxidized in this reaction.

The oxidation reduction reactions are called redox reaction. These reactions are take place by gaining or losing the electrons and oxidation state of elements are changed.

Oxidation:

Oxidation involve the removal of electrons and oxidation state of atom of an element is increased.

Reduction:

Reduction involve the gain of electron and oxidation number is decreased.