A rock has a volume of 50 mL and a mass of 200 g. What is the density??? please help

Answer: Size of Solute and Surface area

Explanation:  Rate of dissolution is the speed at which the given solute gets dissolved in the given solvent.

Now this rate of dissolution depends on may factors like-

a) Size of Solute - If the solute size is bigger then it will take much more time to get dissolved. Thus smaller size solute are easily dissolved in the solvent.

b)  Surface area - If the surface area of the solvent is larger, then the collision between the solute and solvent will be much higher and thus rate of dissolution will increase.

Thus decreasing the surface area of solute will lead to decrease in the rate of dissolution.

x- ray is the answer, believe old dude if you want to.. I just had this question on USA Test Prep

Answer: It is xrays

Explanation: because  i got it right just trust me

Final answer:

The coefficient that should be placed in front of H2O to balance the hydrogen atoms for the combustion of ethanol is 3. After balancing the hydrogen atoms, the fully balanced chemical equation for the combustion of ethanol is C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(l).

Explanation:

To balance the hydrogen atoms in the combustion of ethanol, we start with the unbalanced equation C2H5OH(l) + O2(g) → CO2(g) + H2O(l). Ethanol (C2H5OH) contains 6 hydrogen atoms, and since each molecule of water (H2O) contains 2 hydrogen atoms, we need 3 molecules of water to account for all the hydrogen atoms from ethanol. Therefore, the coefficient for H2O in the balanced equation is 3.

After placing 3 in front of H2O, the equation looks like this: C2H5OH(l) + O2(g) → 2CO2(g) + 3H2O(l), which balances the hydrogen atoms. To complete the balancing, the oxygen atoms also need to be accounted for. In the product side, there are a total of 7 oxygen atoms (4 from the 2CO2 and 3 from the 3H2O). There is 1 oxygen atom in the ethanol molecule, so we need 6 more oxygen atoms from O2, which means we need 3 O2 molecules. Thus, the coefficient for O2 is 3. The fully balanced equation is C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(l).

Answer:

Significant figures: 2

Explanation:

There are 2 significant figures since the zeros at the left side don’t count and the number can be expressed in its scientific notation as 11x10-3 cm

Answer:

Explanation:

The law of conservation of mass holds true, because the mass missing is in gas form. The fact that matter can change, doesn't mean they violate this law of conservation.

Dalton's atomic theory proposed that elements are made of atoms, which are indivisible and have specific mass and properties for each element. His theory also stated that atoms combine in fixed ratios to form compounds and cannot be created or destroyed in chemical reactions. Modifications have been made to this theory, as atoms can be divided and isotopes and nuclear reactions exist.

Dalton's Atomic Theory

John Dalton's atomic theory was a groundbreaking attempt to explain the nature and behavior of atoms. The main points of Dalton's atomic theory include:

Elements are composed of extremely small particles called atoms.

Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in these properties.

Atoms cannot be subdivided, created, or destroyed in chemical reactions.

Atoms of different elements can combine in whole number ratios to form chemical compounds.

In chemical reactions, atoms are rearranged, combined, or separated.

Despite its success, modifications to Dalton's atomic theory have been made. We now know that atoms can be divided into subatomic particles (electrons, protons, and neutrons), isotopes of elements can have different masses, and atoms can be transformed via nuclear reactions.

yes the answer would be A. Vapor can be easily condensed back to form water. I know because I took this exam and had this question too.

One mole substance there are [tex]6.02 \times10^2^3[/tex] elementary chemical entity present.  1.5 moles of Helium, there are  [tex]\bold{9.03 \times 10^2^3}[/tex] atoms present.

Mole Concept:

In one mole substance there are [tex]6.02 \times10^2^3[/tex] elementary chemical entity present.

As we know 1 mole = [tex]6.02 \times10^2^3[/tex]

hence,

1.5 moles of Helium = [tex]1.5 \times 6.02 \times10^2^3 = \bold{9.03 \times 10^2^3}[/tex]

Therefore we can conclude that in 1.5 moles of helium, there are  [tex]\bold{9.03 \times 10^2^3}[/tex] atoms present.

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The density of a cube that has a mass of 25 grams and a volume of 125cm will be 0.2 centimeter cube.

The density of the material is defined as the mass of the substance per unit volume or it is the ratio of mass of the substance to the volume of the substance and the unit will be centimeter cube.

To calculate density the given formula is mass of material to the volume of material.

density = mass / volume

                     mass = 25 grams        

                      volume = 125 cm

Substituting the value in the formula,

                  density = 25 / 125

                                = 0.2 centimeter cube.

Therefore, density of a cube that has a mass of 25 grams and a volume of 125cm will be 0.2 centimeter cube.

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Answer:

Van der Waals forces' is a general term used to define the attraction of intermolecular forces between molecules. The bigger the molecule, the bigger the force.

Explanation:

For pure substances, the mass and volume will always be the same or will always change the same way because all substance are the same throughout.

While for mixtures, you can have varying amount of each component therefore mass and volume will not change the same way for substances.

Gas Giants are usually bigger than Terrestrial Planets. Gas Giants also have thicker atmospheres, and have gaseous surfaces. Terrestrial planet tend to be smaller, and have solid surfaces. In our solar system, Mercury, Venus, Earth (home), and Mars are Terrestrial planets.  While Jupiter, Saturn, Uranus (the planet), and Neptune are Gas Giants. Gas Giants are also known as Jovian planets.

The compounds that can be deprotonated by −OH are formic acid and hydrogen sulfide.

Deprotonation may be defined as the process of elimination of a proton from a Bronsted-Lowry acid in an acid-base reaction. Deprotonation does not refer to the ejection or removal of a hydride ion (H-). The process of deprotonation actually removes a +1 charge from a chemical compound.

Formic acid (HCOOH) and hydrogen sulfide (H2S) is typically compound that can be deprotonated through the mechanism of deprotonation.

Such types of compounds are easily ionized in the forms of ions like HCOO- and H+. The deprotonation of such compounds is facilitated by the delocalization of protons to other instable form.

Therefore, the compounds that can be deprotonated by −OH are formic acid and hydrogen sulfide.

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Chemical reactions occur when the starting materials called the reactants rearrange their electrons to create new bonds. It is very difficult to prove the law of conservation of mass in the case of gases.

According to the law of conservation of mass, mass can neither be created nor be destroyed. It can be converted from one form to another. The law of conservation of mass says that the mass of reactants must be equal to the mass of products.

The gas molecules move quickly into the outside space and away from the system. When a gas is produced, it quickly diffuses away from the site of synthesis making it difficult to measure the mass of the products.

So the law of conservation of mass cannot be proved in the case of gases. Randomness is found to very high in gas molecules, so that the measurement of mass is difficult and could not be accurate.

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