Always report their observations and results truthfully
During an investigation a scientist heated 27 g of mercuric oxide till it decomposed to leave a dry product. The total mass of the product formed was 25 g. Does the law of conservation of mass hold true in this case?
Answer:
Yes.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.
So, this law is always happening.How might a hurricane in Florida cause anomalous nest data
What is the difference between a terrestrial planet and a gas giant
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.
How many atoms are equal to 1.5 moles of helium
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.
This number is as many as Carbon atoms present in 12g of Carbon 12. [tex]6.02 \times10^2^3[/tex] is also known as Avogadro's constant.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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A block has sides that are 2cm long, 3 cm wide, and 2cm high. What is the volume ?
True or false forces on earth are different from those elsewhere in the universe
Starting with the unbalanced equation for the combustion of ethanol,
C2H5OH(l)+O2(g)→CO2(g)+?H2O(l)
what coefficient should be placed in front of H2O to balance the hydrogen atoms
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).
list the major points in daltons atomic theory
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 fuel tank of an automobile has a capacity of 14.8 gallons. if the density of gasoline is 42.0 lb/ft^3, what us the mass of fuel in kilograms when the tank is full?
What is a boundary between geologic units?
geologic map
geologic unit
contact
fault line
What is the formula for germicide that is sufficient to kill blood-borne pathogens?
science question down below hurry
Give the number of significant figures: 0.011 cm
Significant figures:
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
what is the density of a cube that has a mass of 25 grams and a volume of 125cm
The density of a cube that has a mass of 25 grams and a volume of 125cm will be 0.2 centimeter cube.
What is density?
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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is sodium hydroxide dissolves in water a physical change
What happens to the speed of molecules in water vapor when it condenses to form a liquid?
which element is most reactive sodium,magnesium, or aluminum and why?
Why is it hard to prove the law when a gas is produced?
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.
What is law of conservation of mass?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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how do atoms form a new substance
Justine observed that the water level in a dish placed on the window sill decreased after a few days, and vapor formed. What best explains that she observed a physical change? Vapor can be easily condensed back to form water. Water and its vapor react with substances in different ways. The molecular composition of water changed when the water level decreased. Bonds between hydrogen and oxygen broke when the water level changed.
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.
What best describes the degree to which a material can transmit Heat A:melting point B:boiling point C: thermal conductivity D: electrical conductivity
What advantage do computers give scientist as tools for investigations?
why is the principle about the relationship between mass volume always true of substances , but not always true for mixtures
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.
Visible light represents a very small portion of the electromagnetic spectrum. Radiation to the left in the image, such as microwaves, has a longer wavelength than visible light. Radiation to the right has a shorter wavelength than is observable. Which radiation has a higher frequency than visible light?
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
what do you think he will found out when he swings the pendulum for 15 seconds
What characteristic of the molecule is important for this force to be effective in bonding?
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:
Which layer of earth atmosphere contains no water vapor, has an atmospheric pressure less than 0.1 atmosphere, and has an air temperature that increases with altitude?
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Which factor causes a decrease in the rate of dissolution?
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.