A container has 1.50 moles of hydrofluoric acid molecules, a deadly acid that can kill someone in minutes molecules are 9.03 × 10 ²³ molecules.
What are moles?Moles are the smallest unit of a molecule that participates in the formation of the molecules to compete in a reaction and the value will be equal to the Avogadro number 2.303 × 10 ²³.
To calculate the total number of molecules the value of one mole is 2.303 × 10 ²³. so, for 1.50 moles of hydrofluoric acid will be,
1.50 moles = 2.303 × 10 ²³.moles
hydrofluoric acid molecules = 1.50 × 2.303 × 10 ²³
hydrofluoric acid molecules = 9.03 × 10 ²³ molecules.
Therefore, 9.03 × 10 ²³ molecules are present in the container has 1.50 moles of hydrofluoric acid molecules, a deadly acid that can kill someone.
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Is this statement true or false?
A chemical reaction is balanced when the number of atoms of each element is the same for both the reactants and the products.
true
false
Answer:
truetysm
tysm
tysm dear
Someone help me with this I will make you brain
HELP PLEASE I HAVE A TEST TODAY AND I DON'T UNDERSTAND ANY OF THIS...
265 kilojoules of energy are added to 150g of ice at 0 degrees C how many grams of water would boil away
Answer:
About 67 grams or 67.39 grams
Explanation:
First you would have to remember a few things:
enthalpy to melt ice is called enthalpy of fusion. this value is 6.02kJ/mol
of ice
it takes 4.18 joules to raise 1 gram of liquid water 1 degree C
water boils at 100 degrees C and water melts above 0 degrees C
1 kilojoules is 1000 joules
water's enthalpy of vaporization (steam) is 40.68 kJ/mol
a mole of water is 18.02 grams
we also have to assume the ice is at 0 degrees C
Step 1
Now start with your ice. The enthalpy of fusion for ice is calculated with this formula:
q = n x ΔH q= energy, n = moles of water, ΔH=enthalpy of fusion
Calculate how many moles of ice you have:
150g x (1 mol / 18.02 g) = 8.32 moles
Put that into the equation:
q = 8.32 mol x 6.02 = 50.09 kJ of energy to melt 150g of ice
Step 2
To raise 1 gram of water to the boiling point, it would take 4.18 joules times 100 (degrees C) or 418 joules.
So if it takes 418 joules for just 1 gram of water, it would take 150 times that amount to raise 150g to 100 degrees C. 418 x 150 = 62,700 joules or 62.7 kilojoules.
So far you have already used 50.09 kJ to melt the ice and another 62.7 kJ to bring the water to boiling. That's a total of 112.79 kJ.
Step 3
The final step is to see how much energy is left to vaporize the water.
Subtract the energy you used so far from what you were told you have.
265 kJ - 112.79 kJ = 152.21 kJ
Again q = mol x ΔH (vaporization)
You know you only have 152.21 kJ left so find out how many moles that will vaporize.
152.21 kJ = mol x 40.68 or mol = 152.21 / 40.68 = 3.74 moles
This tells you that you have vaporized 3.74 moles with the energy you have left.
Convert that back to grams.
3.74 mol x ( 18.02 g / 1 mol ) = 67.39 grams
Inside the box is a list of endangered animals in the Philippines. Group the animals in three ways and make a diagram of your groupings in the space below.
if you answer this question right you get 100 points. What is my favorite color it is a 4 letter word and it ends with e
° °
∵ω∵
Answer:
Blue!!
I think it is blue!
is it blue cuz i think its blue
Someone pls help me I will make you brain
Answer:
lll and ll
Explanation:
pls help ASSSAPPPP!!!!
Answer:
b or d
Explanation:
Answer:
The answer is B (it's reactivity)
How do anion formation and valence electrons relate?
Answer:
Atoms gain valence electrons to form anions.
Explanation:
When acids dissolve in water, what is released into the resulting solution?
H+ and OH-ions equally
H+ (hydrogen) ions
OH- (hydroxide) ions
Answer:
H+ (hydrogen) ions
Explanation:
Answer:
H+ (hydrogen) ions
Explanation:
plz help fast. Which of the following represents a chemical change? (2 points)
1. decomposition of stone due to acid rain
2. iron's attraction to a magnet
3. the pink color of a rose
4. rocks being smoothed by rapid water movement
Answer:
1. Decomposition of stone due to acid rain.
3. The pink color of a rose.
Explanation:
Chemical changes always end up with new products in an equation, or it has always something to do with chemicals. Physical changes on the other hand, do not result in new products and it just changes the physical properties and physical state of matter of the object.
What volume of hydrogen gas forms if 10.0 g of Zn reacts at STP?
Answer:
0.690 liters is the volume of hydrogen gas produced if 2.00 grams of zinc is used with an excess of hydrochloric acid.
Explanation:
Zn(s)+2HCl(aq)\rightarrow ZnCl_2(aq)+H_2(g)Zn(s)+2HCl(aq)→ZnCl2(aq)+H2(g)
Mole so zinc = \frac{2.00}{65 g/mol}=0.03077 mol65g/mol2.00=0.03077mol
According to reaction, 1 mole of zinc gives 1 mole of hydrogen gas.
Then 0.03077 mole of zinc will give :
\frac{1}{1}\times 0.03077 mol=0.03077 mol11×0.03077mol=0.03077mol of hydrogen gas
Pressure of hydrogen gas ,P= 1 atm
Temperature of of hydrogen gas ,T= 273.15 K
Volume of hydrogen gas = V = ?
Moles of hydrogen gas = 0.03077 mol
PV = nRT (Ideal gas equation )
V=\frac{nRT}{P}=\frac{0.03077 mol\times 0.0821 atm L/mol K\times 273.15 K}{1 atm}V=PnRT=1atm0.03077mol×0.0821atmL/molK×273.15K
V = 0.690 L
Please answer quickly
Answer:
a) II and III
is the correct
Although a scientific theory is well supported and widely accepted, what might cause it to change? HELPPP
a new evidence
b scientific law
c indivial claim
D a scientific model
Answer:
d
Explanation:
Someone pls help me I will make you you brain
Answer:It’s cyclone movement
Explanation:
What forms a weak acid?
(Hint: Carbonation)
A) carbon dioxide/iron
B) carbon dioxide/water
C) carbon dioxide/materials
D) Oxygen/rust
Which of the following is a physical change?
evaporation
explosion
rotting of food
corrosion
Answer:
i believe it is c
evaporation
Explanation:
Hope it's the correct one if not very sorry.
Which of the following are properties of compounds formed by covalent bonding (Select all that apply)
1. When you dissolve an covalent compound in water, the solution does not conduct electricity.
2. Covalent compounds often have lower melting points than ionic compounds.
3. When you dissolve an covalent compound in water, the solution conducts electricity.
4. Covalent compounds form when combining two or more nonmetal atoms.
5. Covalent compounds form when combining a two metal atoms.
6. Covalent compounds form when combining a metal atom with a nonmetal atom.
Answer:1, 2, and 4
Explanation:
covalent bonds are not ionic. the elements SHARE electrons
Which of the following are properties of compounds formed by covalent bonding (Select all that apply)
1. When you dissolve an covalent compound in water, the solution does not conduct electricity.
2. Covalent compounds often have lower melting points than ionic compounds.
3. When you dissolve an covalent compound in water, the solution conducts electricity.
4. Covalent compounds form when combining two or more nonmetal atoms.
5. Covalent compounds form when combining a two metal atoms.
6. Covalent compounds form when combining a metal atom with a nonmetal atom.
The properties of covalent compounds are option 2, 3 and 4. Covalent bonds are weaker than ionic bonds.
What are covalent bonds?Covalent bonds are formed by sharing electrons between two atoms. Non metals with comparable electronegativities forms covalent bonds. They are weaker than ionic bond. Thus have lower melting point.
Melting point depends on the bond strength that's why covalent compounds have lower melting point compared with ionic bonds.
Polar covalent bonds can conduct electricity when dissolved in water because of the presence of free electrons. Thus option 3 is correct.
Hence, the properties in option 2, 3 and 4 are correct for covalent compounds.
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Define what the goldilocks zone in our solar system ?
Answer:
the "goldilocks zone" is the habitable zone around a star where it's not too hot and not too cold, so liquid water and life can exist on the planets in this zone.
Explanation:
The distance Earth orbits the Sun is just right for water to remain a liquid and for life to not be frozen or fried. This distance from the Sun is called the habitable zone, or the Goldilocks zone.
how did dalton advance the atomic philosophy proposed by democritus
Answer:
(Hope this helps can I pls have brainlist (crown)☺️)
Explanation:
Dalton turned Democritus' views on atoms into a scientific theory by employing experimental methods. Atoms can join or detach during chemical processes, but they never transform into a different atom.
Dalton was an excellent polymath, a natural philosopher, and a real scientist. His thorough investigations prompted him to suggest an early atomic theory for which exceptions would be difficult to uncover today:
Dalton offered the following:
Atoms are microscopic particles that make up elements. Atoms of the same element have the same size and mass; however, atoms of other elements have varying sizes and masses when compared to atoms of other elements. Subdivision, creation, and destruction of atoms are all impossible.
All of these ideas were developed after a great deal of testing. Other researchers may replicate his work, and new findings could be included into this atomic idea.
Democritus, on the other hand, was a 5th-century BC Greek philosopher. He conducted no experimental work as far as we know, and none of his publications have survived. He postulated that matter was made up of a single indivisible element known as an atom; the word atom originates from the Greek word oos, which meaning "uncuttable" or "indivisible." So the name atom might be a homage to Democritus.
suppose that hypothetical element Jovian occurs as three isotopes with mass numbers 44, 46, and 48 respectively. If, in nature, Jovian occurs as Jovian-44 approximately 22.4% of the time, and as Jovian-46 approximately 44.0% of the time, what is the best value to use as the atomic mass of Jovian?
Answer:
46.2 amu
Explanation:
The average atomic mass of an element can be determined using the percentage abundance and mass of its isotopes. The average atomic mass of the hypothetical element Jovian is 46.2 amu.
What is average atomic mass?Most of the elements have two or more isotopes in nature with different percentage abundance and mass. The average atomic mass of the element is then calculated using the formula written below:
Average atomic mass = % abundance /100 × mass of isotope 1 + % abundance /100 × mass of isotope 2 + .....
Given the mass % abundance of Jovian -44 = 22.4 %
Jovian- 46 = 44 %
Jovian -48 = (100 - (44 + 22.4)) = 33.6 %
Average atomic mass of Jovian = ( 22.4 /100 × 44 ) + ( 44 /100 × 46) + ( 33.6 /100 × 48 ) = 46.2 amu
Therefore, the average atomic mass of the hypothetical element is 46.2 amu.
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Does sodium (Na) and argon (Ar) on the periodic table have similar properties? Explain in terms of location on the periodic table
Sodium (Na) and Argon (Ar) on the periodic table does not have similar properties.
PERIODIC TABLE:
Periodic table is the organized table that showcases the position of elements. The periodic table is organized into groups and periods. Groups of the periodic table is in a vertical format labeled 1 - 7 while the period is in a horizontal format labeled 1 - 7. Elements in the same group have the same number of valence electrons and hence, possess similar chemical properties. Sodium (Na) belongs to group 1 while argon is a noble gas, hence, they are not in the same group of the periodic table and cannot have same properties.Learn more at: https://brainly.com/question/24089206?referrer=searchResults
How many Atoms are in H2COCH? Need asap pleassseee!
Mitotic cyclins control the progression of S phase and mitosis. G1 phase and G2 phase. S phase and G2 phase. G2 phase and mitosis
Answer:
D
Explanation:
Its D
Answer:
Its d for edge
Explanation:
Do you think the Clean Air Act was a good solution to the changing environment in England? Explain.
Americans breathe less pollution and face lower risks of premature death and other serious health effects. Environmental damage from air pollution is reduced. The value of Clean Air Act health benefits far exceeds the costs of reducing pollution. ... New plants and factories install modern pollution control technology.
Which equation is balanced?
A) A
B) B
C) C
D) D
Answer:
All of them are equal cause they both have the same sign
Explanation:
how many bonding and non bonding domains are on the central atom in NH2-
1bonding and 3non-bonding
(Refer to the attachment for structure
draw the skeletal structure of the alkyl halide that forms the following alkene as the only product in an elimination reaction. you do not need to show lone pairs.
The alkyl halide that forms the alkene shown as the only product in an elimination reaction is bromomethyl cyclohexane.
An elimination reaction is a reaction in which two atoms are removed to create a double bond. Elimination reaction is a type of reaction that is common to alkyl halides.
In this reaction, a hydrogen atom and a halogen atom are both removed to yield a double bond. The structure of the product depends on the structure of the reactant alkyl halide.
Bromomethylcyclohexane shown in the image attached yields the alkene product in the image attached as the only product when it undergoes elimination reaction.
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during which two processes does a substance release energy?
Answer:
Freezing and condensation
Explanation:
Because they are exothermic, they release energy
how is an inoculating loop or needle sterilized prior to use?
Answer:
it is placed over a bunsen burner to heat up and remove all bacteria
Explanation:
Compared to the atomic radius of sodium, the atomic radius of argon is smaller. This is a result of
The atomic radius of Argon is smaller than the atomic radius of sodium because the effective nuclear charge increases as we move left to right in a period.
What is the atomic radius?The atomic radius can be described as the shortest distance between the center of the nucleus of the atom and the outermost shell of the atom. An atomic radius can also be defined as half the distance between two atoms of the same element bonded together.
In general, the atomic radius of an atom reduces as we move from left to right in a period on the periodic table because while moving from left to right in a period, there is an increase in the effective nuclear charge. In periods, the valence electrons enter in the same outermost shell.
The atomic radius of atom increases when we move down a group because of the addition of a new principle shell.
Sodium is present at beginning of the third period and the Argon is present at the end of the same period. Therefore, Argon experiences a more effective nuclear charge than sodium so it has a smaller atomic radius.
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