Answer:
In one mole of carbon , there are 6.02 × 1023 atoms. so in two moles , there will be twice that = 1.204× 1024.
Which hypothesis is directly tested in an experiment?
a. One specific confounding variable hypothesis.
b. All of the confounding variables hypotheses.
c. The research hypothesis.
d. both b and c
Two grams of sodium chloride (table salt) were completely dissolved in a glass of water. How would you classify the resulting material?
Group of answer choices
As a mixture.
As a salt compound
As a pure substance
As an element
Answer:
This is a mixture.
Explanation:
While you can no longer see the salt when it's dissolved, it's still there! It's just in tiny, tiny, invisible to the eye molecules. It's now a mixture of H20 molecules and NaCl molecules in a solution :)
The water doesn't bond to the salt, so it's not a compound.
It's not just one element, it's a mixture of many!
It's not a pure substance since it's NaCl AND H2O.
Why is fluorine a gas at room temperature?
GIVING BRAINLIEST AND LOTS OF POINTS ‼️‼️
Answer:
In fluorine, the electrons are tightly held to the nuclei. The electrons have little chance to wander to one side of the molecule, so the London dispersion forces are relatively weak. At a low enough temperature the molecules will all be solids. At a high enough temperature they will all be gases.
Explanation:
1. In_____particles are in contact with each other.
Answer:
condensed matter should be your answer
Explanation:
50 POINTS
Which will reduce the possible environmental damage associated with mining uranium?
A. installing newer water recycling systems in older power plants
B. increasing the reprocessing of used fuel for reuse
C. building additional fission nuclear power plants
D. developing better places to store radioactive wastes
Can y’all helping me solving this l will make you the brainlest❤️
Answer:
Genotype = genetic makeup or allele combination
phenotype = physical appearance
homzygous = both alleles are the same
heterozygous = both alleles are different
dominant allele = represented by a capital letter
recessive allele = lowercase letter
If you could only live in one climate forever, what climate would you choose?
Answer:
Explanation:
close to freezing cause once i go to bed my pillow will always stay cold and i can finally have all my blankets on and not over heat and not to mention when i play sports free air conditioning
If ONE mole of rocket fuel, ammonium perchlorate, NH4ClO4, is allowed to react with excess Al so that all of the NH4ClO4 is consumed, how many molecules of water will be produced? (All reactants & products are present in a 1:1 ratio.)
Answer:
9.03×10²³ molecules of H₂O
Explanation:
To solve this, we need to propose the reaction
NH₄ClO₄ → ammonium perchlorate
Al → Aluminum
Those are the reactants; the reaction is:
6NH₄ClO₄ + 10Al → 5Al₂O₃ + 3N₂ + 6HCl + 9H₂O
Then, water is one of the products. If we see the reaction, is a redox type.
Ratio is 6:9. In conclussion:
6 moles of ammonium perchlorate can produce 9 moles of H₂O
Then 1 mol of salt, may produce (1 . 9)/6 = 1.5 moles of water
Let's count the molecules:
1.5 mol . 6.02×10²³ molecules /mol = 9.03×10²³ molecules of H₂O
Why is Newton's first law of motion is sometimes called the law of inertia
Answer:
The reason why Newtons first law of motion is sometimes called the law of inertia is because it states that if the object is in motion, it will not rest unless an unbalanced force acts on the object.
Can anybody do this?
Answer:
0.17907
Explanation:
For the reaction 2h2+o2>h20, how many grams of water are produced from 70 grams of hydrogen
630g
Explanation:
firstly the equation has to be balanced. 2H2+o2>2H2o.
finding the mole of hydrogen?
mole = 70/2 which is equal to 35 mole of hydrogen.
35 mole of hydrogen is equal to the mole of water.
finding the mass of water=?
35=mass/18
mass= 35*18=630g of water
Answer please...
Answer
Answer:
d
Explanation:
Huck, I need help, and I don't get help, I'll Ducking do it again
Which surface will produce the most friction for the fan cart?
Glass
Wood
Metal
Cement
Answer:
wood
Explanation:
I think
I hope it helps
PLEASE HELP GUYS PLEASE!!!! I will LOVE WHOEVER HELP
ME FOREVER
Answer:
B. It is highly flammable.
Explanation:
Chemical properties deal with how the substance will behave when brought into contact with other substances, and usually have to do with it undergoing some kind of reaction. Flammability is a chemical property.
Density, melting point, and color are all considered physical properties.
Answer:
d
Explanation:
ignition is a chemical. reaction
A seedling is planted in soil that does not have any clay. What will most likely happen to the plant?
Answer:
Explanation:
Under good conditions the seedling can thrive in soil that does not have any clay as long as it gets the proper nutrients and right amount of sunlight/water that it needs. Clay in soil can provide the nutrients necessary for seedlings to thrive but can also cause many negatives. One such con of using clay is that it does not absorbe water very well, this ultimately causes the soil to become waterlogged and drowns the plants as no oxygen can pass through. This would ultimately kill the plants.
Which conversion factor below would you use to complete this conversion?
How many liters of bromine gas would 12.3 moles occupy at Standard Temperature and Pressure?
a.) 1 mole/22.4 L
b.) 22.4 mol/1 liter
c.) 22.4 L/1 mole
d.) 1 liter/22.4 mol
Answer:
c.) 22.4 L/1 mole
Explanation:
Using the general gas law equation as follows:
PV = nRT
Where;
P = pressure (atm)
V = volume (L)
n = number of moles (mol)
R = gas law constant (0.0821 Latm/molK)
T = temperature (K)
The standard values for a gas are as follows:
Standard pressure of a gas = 1 atm
Standard temperature of a gas = 273K
According to the information in the question, n = 12.3 moles
Using PV = nRT
V = nRT/P
V = 12.3 × 0.0821 × 273/1
V = 275.68 L
Based on this value of volume in liters for 12.3moles of Br gas, the volume per mole at standard temperature and pressure will be 275.68/12.3 = 22.4 Litres per mole. Hence, the answer is 22.4 L/1 mole.
How many moles are in 122 g of Cu? Conversion factor: 1 mol = molar mass
Answer:
122g/63.5
1.92 mol
A 3.56 L balloon is compressed to 1.00 L at constant temperature. If the initial pressure in the balloon was 101.3 kPa, what is the final pressure?
True or false: All molecules or atoms in a substance have the same amount of kinetic energy at a given temperature?
Answer:
1
False. if they all moved together at any time then it would be a million things withinthe human species all at once at a high rate
If more reactants are used in a chemical reaction, more products will be
produced. This is because *
1 point
More reactants have more atoms to react to form more products
More reactants take up the same volume
Too many products can slow down the reaction
More reactants cause the reaction to heat up
More reactants have more atoms to react to form more products.
More reactants have more atoms to react to form more products in a chemical reaction.
What is a Chemical reaction?This is the process which involves two or more molecules known as reactants collide with the right orientation and force to form a new product.
Increase in reactants means presence of more molecules involved in the reaction thereby leading to the formation of more product.
Read more about Chemical reaction here https://brainly.com/question/11231920?source=archive
plz help fast! P.S. I put chemistry by accident its biology lol
The measure of water’s ability of flow through sediment and rock is called
Answer:
Permeability.
Explanation:
The ability of a rock or soil to allow water to flow through it is call permeability. Materials such as gravel that allow the flow of water are permeable. Materials such as clay or granite that do not allow the flow of water are impermeable.
The faster rate of reaction was caused by using a higher temperature. Explain, in terms of particles, why a higher temperature causes a faster rate of reaction.
Answer:
Increasing the temperature a reaction takes place at increases the rate of reaction. At higher temperatures, particles can collide more often and with more energy, which makes the reaction take place more quickly.
Explanation:
Example 1 How much water (in grams) is produced when 65.2 grams of Calcium carbonate react with phosphoric acid to form calcium phosphate, water, and carbon dioxide?
Answer:
11.75 g H2O
Explanation:
3CaCO3 + 2H3PO4 --> Ca3(PO4)2 + 3H2O + 3CO2
MM H2O = 18.02 g/mol
MM CaCO3 = 100 g/mol
? g H2O = mass CaCO3 x (1 mol CaCO3/MM CaCO3) x (3 moles H2O/3 moles CaCO3) x (MM H2O / 1 mol H2O) = (65.2/100) x 18.02 = 11.75 g H2O
2. What is forensic odontology ? Why is this area helpful for investigators?
Explanation:
forensic odontology is the study of dental applications in legal proceedings. which may include bite marks.
it is helpful as it allows for the identification of unknown bodies through dental records.
Answer:
Also called forensic dentists, forensic odontologists are typically called in to: Identify human remains that cannot be identified using face recognition, fingerprints or other means. Identify bodies in mass fatalities, such as plane crashes and natural disasters. This area is helpful for investigators as it helps find more evidence for each case.
What is humidity?????????
Answer:
it is the moisture in the air
Explanation:
if we buy a dehumidephire we see that it collets water from the air
Answer:
Humidity describes the amount of water vapor or water molecules in the air. Weather scientists use the term “relative humidity,” which Joe Sobel, a meteorologist and senior vice president at Accuweather described as “a comparison of the amount of moisture in the air versus the amount of moisture the air could hold.”
Explanation:
Observa los dibujos cada uno representa una sustancia. Cada bolita representa un simboliza un átomo de un elemento.
Answer:
A: Elemento
B: Elemento
C: Elemento
D: Compuesto
E: Elemento
F: Compuesto
G: Compuesto
H: Compuesto
I: Elemento
J: Compuesto
K: Elemento
L: Elemento
Se adjunta la imagen con los dibujos.
Explanation:
Un elemento químico está compuesto por átomos específicos, por ejemplo el oxígeno, el helio, el sodio, cloro. Por otro lado, un compuesto químico es la combinación de dos o más elementos químicos diferentes, por ejemplo, cloruro de sodio, que forma por la combinación de sodio y cloro (NaCl), dióxido de carbono, que se forma por la unión de carbono con tres átomos de oxígeno (CO₃), agua que se forma por la combinación de dos átomos de hidrógeno con un átomo de oxígeno(H₂O), etc.
Lithium forms ions with a charge of lt Oxygen forms ions with a charge of 2- in the ionic compound lithium oxide, how many
atoms of lithium will there be if there is 1 atom of oxygen?
HELP ME
Answer:
There are 2 lithium atoms in the ionic compound lithium oxide, Li₂O
Explanation:
The charge of ions formed by lithium = 1⁺
The charge of ions formed by oxygen = 2⁻
In the ionic compound lithium oxide having 1 atom of oxygen, we have;
For the compound to be electronically neutral, the sum of the charges of the atoms in the ionic compound is zero
The charge of 1 atom of oxygen in the lithium oxide compound + The charge of the 'n' number of lithium atoms in the lithium oxide compound = 0
∴ 2⁻ + n × 1⁺ = 0
n × 1⁺ = 0 - 2⁻ = 2⁺
n = 2⁺/(1⁺) = 2
n = 2
The number of lithium atoms in the lithium oxide compound, n = 2
Therefore, there are two lithium atoms in the ionic lithium oxide (Li₂O) compound
Calculate the number of moles of NaOH contained in 250. mL of a 0.05M solution.
Answer:
https://newshamchem.weebly.com/uploads/2/2/0/3/22035226/molarity_&_worksheet_answer.pdf
question 9.
Explanation:
Answer:
.0125 moles
Explanation:
Molarity = moles/volume
.05 M = moles/.250L
.0125 = moles
2NO+2CO N 2 +2CO 2 There are 3.0 g of NO and 3.0 g of CO reacting . What is the limiting reactant ?
Answer: NO
Explanation:
As per the given balanced equation, 2 moles of NO reacts with 2 moles of CO. Hence, 3 g or 1.07 moles of CO needs to react with the same number of moles of NO. But we have only 3 g or 0.1 mole of NO. Hence, NO is the limiting reactant.
What is limiting reactant ?A limiting reactant in a reaction is the reactant which is fewer in amount or consume early without complete reaction with other reactants. Hence, as soon as this reactant is consume, the reaction stops.
Given 2 moles of NO reacts with 2 moles of CO.
molar mass of NO = 30 g/mol
molar mass of CO = 28 g/mol.
Number of moles in 3 g of CO = 3/28 = 1.07 moles
number of moles in 3 g of NO = 3/30 = 0.1 moles.
1.07 moles of CO needs 1.07 moles of NO. But only 0.1 moles are present.
Therefore, NO is the limiting reactant in this reaction.
Find more on limiting reactants:
brainly.com/question/14225536
#SPJ2