HELPPP
4) The picture below shows information about the element Gold. How many protons does an atom of Gold have?

Answer:

83.33ml

Explanation:

Firstly, let's notice that 200ml are equal to 0.2L

M=number of moles of the solute ÷ number of liters. Let's call the number of liter by x:

2.5=x÷0.2

x=2.5×0.2

x=0.5

It means you'll need 0.5 mol of HNO. But your solution have 6 moles per liter, so how much do you need? Divide the moles by 12 to have 0.5, so now you need to divide the liter per 12 too. The liter is equal to 1000ml, so:

1000ml÷12=83.33ml

Answer:

HNO3 & H2SO4

Explanation:

HNO3 is Nitric acid and H2SO4 is Sulphuric acid

Answer:

Explanation:

Latent heat of fusion, also known as enthalpy of fusion, is the amount of energy that must be supplied to a solid substance (typically in the form of heat) in order to trigger a change in its physical state and convert it into a liquid (when the pressure of the environment is kept constant). For example, the latent heat of fusion of one kilogram of water, which is the amount of heat energy that must be supplied to convert 1 kg of ice without changing the temperature of the environment (which is kept at zero degrees celsius) is 333.55 kilojoules

The latent heat of fusion of a substance also accounts for the energy required to accommodate any increase in the volume of the substance post the change of its physical state. The temperature at which the substance undergoes the phase transition is called the melting point of the substance. Unless specified to be otherwise, the pressure of the environment (when expressing the latent heat of fusion of a substance) is always assumed to be 1 atmosphere of pressure (which is roughly equal to 101.325 kilopascals).

Answer:

Force is measured in Newtons, which are units that equal 1 kg * m/sec 2. Force is measured in Newtons, N. Mass is measured in kilograms, kg. The unit that is used to measure force in the SI system of units is the Newton.

Answer is Newtons because I looked it up

Answer:

0.313 M NaOH

Explanation:

Got it right on the test.

Taking into account the definition of molarity, the molarity of the solution is 0.313 M.

Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

[tex]molarity=\frac{number of moles}{volume}[/tex]

Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].

In this case, you know:

Replacing in the definition of molarity:

[tex]molarity=\frac{0.75 moles}{2.40 L}[/tex]

Solving:

molarity= 0.313 M

Finally, the molarity of the solution is 0.313 M.

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Answer:

BaF2 + Na2S → BaS2 + 2NaF (balanced equation)

Answer:

Explanation:

it is a covalent bond

carbon atom contains 4 electrons in its valance shell.here,carbon atom shares two of its electrons with two electrons of each oxygen atom forming double covalent bond and forms C02 molecule.

19.6 × ( 1 mol KOH / 56 grams KOH )

= 0.35 mol KOH

_________________________________

0.35 mol KOH ×( 2 mol H2O / 2 mol KOH )

= 0.35 mol H20

_________________________________

0.35 mol H2O × ( 18 g H2O / 1 mol H2O )

= 6.3 grams H2O

Answer:

2-Methylhexane

Because Ethylexane does not have hydrogen molecules neither,also it only has 2 options but they're just repeated

Answer:

289.8g

Explanation:

Using the formula as follows:

mole = mass/molar mass

Molar mass of SnF = 119 + 19

= 138g/mol

Using mole = mass/molar mass

2.1 = mass/138

mass = 2.1 × 138

mass = 289.8g

Answer:

3.02 moles

Explanation:

Converted using mole calculator.

Answer:

[tex]\boxed {\boxed {\sf 3.02 \ mol \ Ag}}[/tex]

Explanation:

We want to convert grams of silver to moles of silver. We can do this in 2 steps.

We can convert grams to moles using the molar mass. It tells us the mass of 1 mole of a substance.

This is a value found on the Periodic Table. It is the same value as the atomic mass, but the units are grams per mole (g/mol) instead of atomic mass units (amu). Look up silver's molar mass.

Let's make a ratio using the molar mass.

[tex]\frac{107.868 \ g\ Ag}{ 1 \ mol \ Ag}[/tex]

Since we are converting 326 grams to moles, we multiply by that value.

[tex]326 \ g\ Ag*\frac{107.868 \ g\ Ag}{ 1 \ mol \ Ag}[/tex]

Flip the ratio so the units of grams of silver cancel.

[tex]326 \ g\ Ag*\frac{ 1 \ mol \ Ag}{107.868 \ g\ Ag}[/tex]

[tex]326*\frac{ 1 \ mol \ Ag}{107.868}[/tex]

[tex]\frac{ 326}{107.868} \ mol \ Ag[/tex]

[tex]3.02221233359 \ mol \ Ag[/tex]

The original measurement of mass (326 grams) has 3 significant figures, so our answer must have the same.

For the number we found, that is the hundredth place. The 2 in the thousandth place (3.02221233359) tells us to leave the 2 in the hundredth place.

[tex]3.02 \ mol \ Ag[/tex]

A silver watchband with a mass of 326 grams is equal to 3.02 moles of silver.

Answer:

B). The rocks are being chemically weathered by the water.

Explanation:

Because the water is slowly destroying the rock

Answer:

12 mmilligrams of Po-218 was the mass of the original starting material

Explanation:

The half-life of a radioactive material is the time taken for half the amount ofnthe original material present in a radioactive material to decay or disintegrate.

After each half-life, half the original material present at the start remains.

For the radioactive polonium-218 having a half-life of 3.04 minutes, it means that if 1 g is the starting material, after 3.04 minutes, 1/2 g will be remaining; after, 6.08 minutes 1/2 of 1/2 which is 1/4 of the starting material will be remaining; and after 9.12 minutes, 1/2 of 1/4 = 1/8 g will be remaining.

From the question, number of half-lives undergone after 9.12 minutes = 9.12/3.04 = 3 half-lives.

After 3 half-lives, 1/8 of the original material is remaining.

1/8 = 1.50 mg

The original mass of the sample at the start = 1.50 mg × 8 = 12 mg

Therefore, 12 milligrams of Po-218 was the mass of the original starting material.

Answer:

they are all true

Explanation:

Answer:

12  My     Magnesium

13 Al Aluminum

19 K Potassium

20 Ca Calcium

Explanation:

I think

Answer:

The chemical formula of diphosphorus monoxide is OP2.

I'm not sure if this is correct, but hope it helps! :)

Answer:

pH = 4

Explanation:

Given that,

The concentration of [H⁺] is [tex]10^{-4}\ M[/tex]

We need to find the pH of the solution. We know that,

[tex]pH=-log[H^+][/tex]

Also,

HNO3 → H+ + NO-3

Put all the values,

[tex]pH=-log[1\times 10^{-4}]\\\\pH=4[/tex]

So, the pH of the solution is equal to 4.

Answer:

The process of unstable (or radioactive) atoms becomes stable by emitting radiation. This event over time is called radioactive decay. Alpha decay results in the loss of two protons and two neutrons from the nucleus

Answer:

radioactive disintegration

Explanation:

A.the force between two non polar molecules are stronger than the force between positive ions and freely moving electrons

Answer:

The initial  E°  for the second cell is the same as for the first cell.

Explanation:

Because the overall chemical reaction that occurs in the cell does not change.

The first galvanic cell generated the cell potential of +1.10 V. The second galvanic cell generates the same cell potential because the overall cell reaction remains the same.

The galvanic cell is given as the electrochemical cell that generates the exchange of chemical and electrical energy.

The cell potential is described as the rate of reaction with the difference in the potential of the cathode and the anode.

The reduction and the oxidation potential are governed by the number of electrons transferred in the chemical reaction.

In the second galvanic cell, the number of electrons transferred from the copper electrode will be equivalent to the first electrode, as the chemical reaction is the same. Thus, the cell potential of the second galvanic cell will be the same as the first cell.

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Answer:

NA + F2 = NAF - Chemical Equation Balancer.

2 Na + F 2 → 2 NaF

Na is a reducing agent, F 2 is an oxidizing agent. ; Pale-yellow to greenish gas with a pungent, irritating odor.

Answer:

I am giving u some explanation related this question pls see that

it may help u

Explanation:

The pH scale measures how acidic an object is. Objects that are not very acidic are called basic. The scale has values ranging from zero (the most acidic) to 14 (the most basic). As you can see from the pH scale above, pure water has a pH value of 7. This value is considered neutral—neither acidic or basic. Normal, clean rain has a pH value of between 5.0 and 5.5, which is slightly acidic. However, when rain combines with sulfur dioxide or nitrogen oxides—produced from power plants and automobiles—the rain becomes much more acidic. Typical acid rain has a pH value of 4.0. A decrease in pH values from 5.0 to 4.0 means that the acidity is 10 times greater.

How pH is Measured

There are many high-tech devices that are used to measure pH in laboratories. One easy way that you can measure pH is with a strip of litmus paper. When you touch a strip of litmus paper to something, the paper changes color depending on whether the substance is acidic or basic. If the paper turns red, the substance is acidic, and if it turns blue, the substance is basic

Answer:

160 g

Explanation:

1 mole of oxygen atom = 16 g

Number of moles of oxygen given = 5 mole

Molecular weight of oxygen molecule = 32 g/ mole

Weight of oxygen in gram = 5 mol x 32 g/mol= 160 g

Therefore, 160 g of oxygen is present in 5 moles.

Answer:

Molecules in both the metal and the surrounding air will start moving at higher speeds.

Explanation:

Temperature is a measure of the average kinetic energy of the molecules in a body. Thus, as the temperature of a body increases, its molecules tend to move faster.

At a high temperature of 150°C, the molecules in the metal hot plate move faster. Similarly, this heat is also transferred to the surrounding air molecules and they too start moving faster.

Therefore at 150°C, molecules in both the metal and the surrounding air will start moving at higher speeds.

Answer:

(C3H6)n

Explanation:

the chemical formula is (C3H6)n