What is the subscript of Carbon? 6 CaCO3

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:

Sediment to sedimentary rock (and vice versa) is Compactation and Cementation.

Explanation:

This happens via Lithification, which is the compacting of sediments under pressure.

Answer:

5 g/cm^3

Explanation:

Density of a substance= mass/ volume

Given:

volume = 4,

mass = 20

Assume volume is in cm^3

Mass is in "g"

Then substitute the values

Density of the substance=( 20/4)

= 5 g/cm^3

Answer:

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

Explanation:

Because the water is slowly destroying the rock

Answer:

its false..

Explanation:

pure water is an excellent insulator and does not conduct electricity. The thing is, you won't find any pure water in nature, so don't mix electricity and water.

hope it helps.

Answer:

False

Explanation:

Pure water does not conduct electricity. This is because pure water do not contain any salts. Pure water can conduct electricity when common salt is added to it, as salt solution is conducting in nature.

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:

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:

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

Answer:

[tex]M_{base}=0.0579M[/tex]

Explanation:

Hello there!

In this case, according to the given information in the undergoing chemical reaction, it is possible for us to realize that barium hydroxide reacts with hydrochloric acid in a 1:2 mole ratio, which means that at the equivalence point, we have:

[tex]2n_{base}=n_{acid}[/tex]

That can be written in terms of molarity and volume:

[tex]2M_{base}V_{base}=M_{acid}V_{acid}[/tex]

Thus, we solve for the molarity of the barium hydroxide to obtain:

[tex]M_{base}=\frac{M_{acid}V_{acid}}{2V_{base}} \\\\M_{base}=\frac{0.0895M*32.35 mL}{2*25.00mL}\\\\M_{base}=0.0579M[/tex]

Regards!

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:

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:

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:

The chemical formula of diphosphorus monoxide is OP2.

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

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:

Answer:

(C3H6)n

Explanation:

the chemical formula is (C3H6)n

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:

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:

have g8igcicg9ccgco

Explanation:

gcohogxzrxog floor. gi gi gi gi. r. uvgi7rz. g yde6ifkg. gg g goog oh g of ifz8fd8dti

Answer:

they are all true

Explanation:

Answer:

Aluminium is malleable. It means it can be hammered or changed into other shapes easily. In this case, the shape of a soft drink can.

Explanation:

This is my answer.

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

Answer:

12  My     Magnesium

13 Al Aluminum

19 K Potassium

20 Ca Calcium

Explanation:

I think

Answer:

Trabalho realizado por máquina térmica  = 250 J

Explanation:

Dado

Eficiência da máquina térmica = 5% = 0,05

A eficiência é igual à proporção do trabalho realizado pela máquina térmica para o calor fornecido a ela

Por isso,

0,05 = Trabalho realizado por máquina térmica / 5000 J

Trabalho realizado por máquina térmica = 5000 J * 0,05 = 250 J

Answer:

The space surrounding a magnet within which the magnetic effect is felt is called Magnetic field. A magnetic field is a vector field that describes the magnetic influence of electrical currents and magnetic materials.

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:

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.