What is the empirical formula for a molecule containing 46.8% Si and 53.2% O?

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.

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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Blizzards pose hazards beyond hurricane-force winds and snow-filled roads, including infrastructure failures leading to fatalities, potential health issues like respiratory ailments, injuries due to hazardous conditions, and significant economic impacts.

Beyond the direct impact of hurricane-force winds and snow-filled roads, blizzards can cause various other hazards that affect both people and the environment. Critical infrastructure can fail, as seen in the south Texas freeze, where electrical capacity faltered leading to widespread blackouts. The lack of power in freezing temperatures can lead to fatalities and other severe consequences, including the inability to heat homes, frozen and burst water pipes, and the loss or contamination of the water supply.

Another major hazard caused by blizzards is the health impact on individuals. This includes conditions like 'dust pneumonia,' especially among those vulnerable such as children and the elderly, due to prolonged exposure to dust and soot inhalation. In addition, extreme weather conditions can lead to a higher incidence of injuries and exacerbate chronic health conditions, including respiratory diseases. Moreover, the economic damage from such a storm can be immense, disrupting local economies and livelihoods long after the storm has passed.

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

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).

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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Answer:

In biology, adaptation has three related meanings. The definition that relates most to this question is given below:

Adaptation is the dynamic evolutionary process that fits organisms to their environment, enhancing their evolutionary fitness.

A Nettle plant also known as common nettle, stinging nettle nettle leaf, or just a nettle or stinger, is a herbaceous perennial flowering plant in the family Urticaceae with the ability to sting.

Explanation:

One of the biological traits that the nettle has is its ability to produce inflammatory effect (that is a burning stinging sensation on the skin known as "contact urticaria"). This unpleasant effect is achieved by impaling the skin of the animal via spicules. The spicules cause mechanical irritation.

The stinging effect is also achieved by the introduction of biochemical irritants such as histamine, serotonin and choline among other chemicals into the skin.

This sort of defence or protection mechanisam keeps animals away from the nettle.

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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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Answer :  The correct option is, (B) Gallons

Explanation :

English system : It is defined as the measurement system that is used in many countries including the United States.

The English system measured the things in feet, inches and mile for length, ounce, ton, pint and gallons for volume.

As per question, we conclude that  the unit of volume in the English system of measurement is gallons.

Hence, the correct option is (B) Gallons

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

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.

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.

The volume of the substance can be calculated by dividing the given mass (0.451g) by the density (0.824 g/mL). Therefore, the volume equals approximately 0.547 mL.

The subject of this question is the calculation of volume using the given mass and density of a substance. The density is defined as mass per unit volume. Thus, you can calculate volume by dividing the mass by the density.

For this specific question, the given mass of the substance is 0.451g and the density is 0.824 g/mL. To calculate volume, divide the mass by the density. So, Volume = mass/density = 0.451g / 0.824 g/mL = 0.547 mL.

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Answer:

41,160 is the first

4,200 is the second

less than is the third

6,860 is the last one

Explanation:

The weight of the Lunar Landing module on Earth is 41202 N

The mass of the lunar landing module on the moon is 4200 N

The weight of the lunar landing module on the moon is less than its weight on Earth.

The calculated weight in the moon is 6867 N

A lunar landing module is a lunar landing designed to enable astronauts to travel via a spacecraft in a lunar orbit as well as the lunar surface.

From the given  parameters:

The weight of the Lunar Landing module on Earth is:

Weight on Earth = mass (m) × acceleration due to gravity (g)

Weight on Earth = 4200 kg × 9.81 m/s²

Weight on Earth = 41202 N

The mass of the Lunar Landing module on the Moon is calculated by using the formula:

Weight on Moon = mass (m) × acceleration in the moon

Where;

Since mass on earth = mass in the moon;

The weight of the lunar landing module on the moon is less than its weight on Earth.

The calculated weight in moon = 4200 × 1.635 m/s²

The weight in moon = 6867 N

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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.