Answer:
Helium
He
atomic number 2.
It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas,
Explanation:
These different types of helium atoms have different masses (3 or 4 atomic mass units ), and they are called isotopes. For any given isotope, the sum of the numbers of protons and neutrons in the nucleus is called the mass number. This is because each proton and each neutron weigh one atomic mass unit (amu). By adding together the number of protons and neutrons and multiplying by 1 amu, you can calculate the mass of the atom. All elements exist as a collection of isotopes. The word ‘isotope’ comes from the Greek ‘isos’ (meaning ‘same’) and ‘topes’ (meaning ‘place’) because the elements can occupy the same place on the periodic table while being different in subatomic construction.
Why can water dissolve many substances
Answer:
a substance that can dissolve other molecules and compounds, which are known as solutesBecause of its ability to form hydrogen bonds, , meaning that it can dissolve many different kinds of molecules.
Explanation:
why does a new flu shot need to be made each year ?
because we could be sick if don't get the shot there is a higher chance to have the flu
An orbital is a region in an atom where there is a high probability of finding
Answer: Electron
Explanation:
An orbital is a region in an atom where there is a high probability of finding an electron.
What is the name of the functional group that is attached to this hydrocarbon? The first and last of a chain of three carbons are each single bonded to 3 H; the center carbon is double bonded to O. alkyl halide alcohol carbonyl ketone
Answer:
Ketone
Explanation:
According to the description of the functional group attached to the hydrocarbon - the first and last of a chain of three carbons are each single bonded to 3 hydrogen (H)atoms; the center carbon is double bonded to an oxygen atom, O - it can be deduced that the functional group is a ketone group.
A ketone is a functional group with the structure R₂-C=O, where the two R are alkyl or phenyl groups which may be the same or different. The carbon in a double covalent bond with oxygen is called the carbonyl carbon. The two R groups are bonded to the carbonyl carbon in single covalent bonds.
In the hydrocarbon in this question, the two R groups are methyl groups, CH₃ bonded to the carbonyl carbon. The name of the hydrocarbon is propanone and it is a ketone molecule.
Answer:
Ketone
Explanation:
Explain this statement in your own words and give an example. The properties of the substances around us depend on the atoms and molecules that compose them.
Answer:
See explanation
Explanation:
Substances are composed of atoms. The combination of atoms in a substance determines the properties that the substance exhibits.
For instance, if atoms of metals and nonmetals combine, they give rise to ionic substance which are mostly solid and have high melting and boiling points.
On the other hand, atoms of nonmetals combine with each other to form covalent substances having low melting and boiling points and high vapour pressure sometimes.
Similarly, the kind of molecules present in a substance also determine the nature of the substance. For instance, the high boiling point of water is attributed to the polarity of the O-H bond. This explains why it has a much higher boiling point than CH4 of comparable molar mass but is a non-polar molecule.
Palladium acts as a catalyst for the synthesis of carbon dioxide from carbon monoxide and molecular oxygen. Which equation below represents this reaction?
Answer:
[tex]C+O_2\ \overrightarrow{Pd} \ CO_2[/tex]
Explanation:
Hello!
In this case, since the catalytic reactions involve the presence of a catalyst that decrease the activation energy of the undergoing chemical reaction, when we need to include it in the chemical equation, we usually put on or underneath the reaction arrow, just as shown below:
[tex]C+O_2\ \overrightarrow{Pd} \ CO_2[/tex]
Best regards!
8. Mary, the mouse, was hiding in the rocks when she saw a sandwich hit the ground at
the park. Being she was hungry, she decided to run to the sandwich, which was 30 feet
away. It took her 5 seconds to get to the sandwich. What was her average speed?
A box rests motionless on the ground. A student is pushing the box to the left with a force of 5 newtons. The force of friction opposes the student's force with a magnitude of 2 newtons in which direction and with what type of speed will the box move? A It will move left at a constant speed B It will move left at an increasing speed It will move right at a constant speed D It will move right at an increasing speed.
Answer: B
Explanation:
A box rests motionless on the ground. A student is pushing the box to the left with a force of 5 newtons. The force of friction opposes the student's force with a magnitude of 2 newtons in which direction and with It will move left at an increasing speed will the box move.
What is speed?speed is defined as the rate at which the position of an object changes in any direction. Speed is measured as the ratio of distance travelled to time. Speed is a scalar quantity because it only has direction and not magnitude.
The mathematical representation of speed is as follows: s = d/t
s is the speed in m.s-1
d is the distance travelled in meters
t is the time in seconds
There are four types of speeds and they are:
Constant speed Variable speed Average speed Instantaneous speedTo learn more about speed, refer;
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limestone CaCo3 decomposes into lime according to the equation below
CaCo3 = CaO + CO2
(i) Balance the chemical equation above
(ii)what mass of limestone would produce 11.2 grams of lime?
Show your working
Answer:
Mass = 19.0 g
Explanation:
Given data:
Mass of limestone react = ?
Mass of lime produced = 11.2 g
Solution:
Balanced chemical equation:
CaCO₃ → CaO + CO₂
Number of moles of lime:
Number of moles = mass / molar mass
Molar mass of lime 56.1 g/mol
Number of moles = 11.2 g/ 56.1 g/mol
Number of moles = 0.19 mol
Now we will compare the moles of CaO and CaCO₃
CaO : CaCO₃
1 : 1
0.19 : 0.19
Mass of limestone react:
Mass = number of moles × molar mass
Mass = 0.19 mol × 100.1 g/mol
Mass = 19.0 g
Zns (zinc sulfide) (Zn = 65.38; S = 32.06] *
The question is incomplete, the complete question is;
Zinc and sulfur react to form zinc sulfide by the equation shown below. How many grams of ZnS can be formed when 12.0 g of Zn reacts with 6.50 g of S? (Atomic mass: Zn = 65.38, S = 32.06).
Answer:
17.5 g of ZNS
Explanation:
The equation of the reaction is;
Zn(s) + S(s) ------->ZnS(s)
Number of moles of Zn = 12.0/65.38 = 0.18 moles
Number of moles of S = 6.50/32.06 = 0.20 moles
Hence Zn is the limiting reactant
If 1 mole of Zn yields 1 mole of ZnS
Then 0.18 moles of Zn also yields 0.18 moles of ZnS
Mass of ZnS produced = 0.18 moles * 97.44 g/mol = 17.5 g of ZNS
Answer:
17.5 g of ZNS
Explanation:
A chemist prepares a solution of potassium iodide (KI) by measuring out 88. umol of potassium iodide into a 200. mL volumetric flask and filling the flask to
the mark with water.
Calculate the concentration in mol/L of the chemist's potassium iodide solution. Round your answer to 2 significant digits.
Please Help me!
The concentration in mol/L of the chemist's potassium iodide solution : = 4.4 x 10⁻⁴ M
Further explanationGiven
88. μmol of Potassium iodide
200. mL volumetric flask
Required
The concentration
Solution
Molarity is a way to express the concentration of the solution
Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution
[tex]\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}[/tex]
Conversion :
88. μmol = 88 . 10⁺⁶ mol = 8.8 10⁻⁵ mol
200 ml = 0.2 L
The molarity :
= n : V
= 8.8.10⁻⁵ : 0.2
= 4.4 x 10⁻⁴ M
19.
Look at the following chemical equation.
NaBr + Cl2 → 2NaCl + Br2
Is this a balanced chemical equation?
A. Yes, because the mass of the reactants is equal to the mass of the products.
В.
No, because the mass of the reactants is less than the mass of the products.
C.
No, because the reactants contain fewer molecules than the products.
D
Yes, because the reactants contain the same number of chlorine (CI) atoms as the products.
Answer:
В. No, because the mass of the reactants is less than the mass of the products.
Explanation:
Chemical equation:
NaBr + Cl₂ → 2NaCl + Br₂
The given equation is not balanced because number of moles of sodium and bromine atoms are less on reactant side while more on the product side.
There are one mole of sodium and one mole of bromine atom on left side of equation while on right side there are 2 moles of bromine and 2 moles of sodium atom are present. The number of moles of chlorine atoms are balanced.
Balanced chemical equation:
2NaBr + Cl₂ → 2NaCl + Br₂
Now equation is balanced. Number of moles of sodium , chlorine and bromine atoms are equal on both side.
Please help, I need to turn this in.
cal the vol of carbon(ii)oxide produced at stp by. d dehydration of 6.00g of methanoic acid with concentrated H2SO4 (carbon =2oxygen=16 hydrogen=1 molar volume = 22.4dmcube pleeeeeeeeese I really need it a lot
The volume of CO= 2.912 L
Further explanationGiven
Dehydration of 6 g of methanoic acid with H2SO4
Required
The volume of CO
Solution
Reaction
HCOOH ⇒ CO+H₂O
MW = 1.Ar C+2.Ar H+2.Ar O
MW = 1.12+2.1+2.16
MW= 46 g/mol
mol = mass : MW
mol = 6 g : 46 g/mol
mol = 0.13
From equation, mol ratio HCOOH : CO, so mol CO = 0.13
Vm = 22.4 L
so for 0.13 mol :
= 0.13 x 22.4 L
= 2.912 L
What is the concentration of Iodine I2 molecules in a solution containing 2.54 g of iodine 250 cm3 of solution? A 0.01mol/dm3 B 0.02mol/dm3 C 0.04mol/dm3 D 0.08mol/dm3
Answer:
C. 0.04 moles per cubic decimeter.
Explanation:
The molar mass of the Iodine is 253.809 grams per mole and a cubic decimeter equals 1000 cubic centimeters. The concentration of Iodine ([tex]c[/tex]), measured in moles per cubic decimeter, can be determined by the following formula:
[tex]c = \frac{m}{M\cdot V}[/tex] (1)
Where:
[tex]m[/tex] - Mass of iodine, measured in grams.
[tex]M[/tex] - Molar mass of iodine, measured in grams per mol.
[tex]V[/tex] - Volume of solution, measured in cubic decimeters.
If we know that [tex]m = 2.54\,g[/tex], [tex]M = 253.809\,\frac{g}{mol}[/tex] and [tex]V = 0.25\,dm^{3}[/tex], then the concentration of iodine in a solution is:
[tex]c = \frac{2.54\,g}{\left(253.809\,\frac{g}{mol} \right)\cdot (0.25\,dm^{3})}[/tex]
[tex]c = 0.04\,\frac{mol}{dm^{3}}[/tex]
Hence, the correct answer is C.
What is both found in the outer core and mantle of the earth
Answer:
the Mantle
Explanation:
Answer:
Molten lava
Explanation:
I'm learning the same thing :)
Radars can help meteorologists detect clouds and sailors detect submarines. Radars send out radio waves and record their echoes after the radio waves reflect off an object. Two radars send out radio waves
with the same frequency. The first radar sends radio waves through the air. The second radar sends radio waves through the ocean. What is true about these radio waves?
Answer:
D
Explanation:
Same Wavelength. Also cause i did the test
Answer:
They have the same wavelenght
Explanation:
due fan 22 at 2.30pm
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This is a traded discussion 100 points possible
Rules Governing Electron Configurations
List and describe in your own words and in grammatically correct sentences, the rules that gover the manner in which electrons fill the energy levels around the nucleus of an atom, Explain
why there are exceptions to these rules and provide at least one example,
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Answer:
im not sure but i do know you have to look under 5.2
Explanation:
PLEASE HELP ME ASAP!!!!!
Answer:
ok ,
Explanation:
.
Convert 22.5 grams H2O to moles
Answer:
1.25mol
Explanation:
moles(n)=mass/Mr
Mr of H2O=(1*2)+16
=18
n=22.5/18
=1.25 mol
1.25 mol
The equation for the calculation of mass is as follows:-
[tex]moles(n)=mass(g)/molar mass(g/mol)[/tex]......(1)
Given:-
Mass of water =22.5 g
Molar mass of water=18 g/mol
Subsitute both the values in the equation (1) as follows:-
[tex]n=22.5\ g/18\ g/mol\\=1.25 mol[/tex]
Hence, the value in moles is 1.25 mol.
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What pressure is exerted by 0.625 moles of a gas in a 45.4 L container at -24.0 °C? Find pressure in units of atm.
Answer:
Ok to solve this you will need to use the Ideal Gas Law Formula which is as follows:
PV = nRT
P= pressure
V= volume
n= # of moles
R= Universal Gas Constant (0.0821 L x atm/mol x K)
T= Kelvin temperature
1.Simplify the Ideal Gas Law formula to what you need to solve for:
P = (nRT)/ V
2. List all you components as follows (this makes the process easier):
P = ?
V = 45.4 L
n = 0.625 mol
R = 0.0821 L x atm/ mol x K
T = 249 K
To find the Kelvin temperature K = C + 273
3. Plug in all your components in your set up formula:
P = [(0.625 mol)(0.0821 L x atm/ mol x K)(249 K)] / (45.4 L)
4. Cross out all similar units so the only thing left is atm because you are trying to find pressure.
P = [(0.625)(0.0821atm)(249)] / (45.4)
5. Multiply through and simplify
P = 0.28 atm
B. is the correct answer.
Glad I could help!! If you have any other questions just message me. Hopefully this was helpful.
Explanation:
Calcula la masa atómica del Hierro y las partículas subatómicas de cada uno de sus isótopos. Fe-54 (5.82%), Fe-56 (91.66%), Fe-57 (2.19%) y Fe-58 (0.33%).
Answer:
La masa atómica del hierro es 55.847 gramos por mol.
Explanation:
Las masas molares de [tex]Fe_{54}[/tex], [tex]Fe_{56}[/tex], [tex]Fe_{57}[/tex] y [tex]Fe_{58}[/tex] son 53.940 gramos por mol, 55.935 gramos por mol, 56.935 gramos por mol y 57.933 gramos por mol, respectivamente. La masa atómica del hierro se determina mediante el siguiente promedio ponderado:
[tex]M_{Fe} = \frac{5.82}{100}\times \left(53.940\,\frac{g}{mol} \right)+\frac{91.66}{100}\times (55.935\,\frac{g}{mol})+\frac{2.19}{100}\times \left(56.935\,\frac{g}{mol} \right)+\frac{0.33}{100}\times \left(57.933\,\frac{g}{mol} \right)[/tex]
[tex]M_{Fe} = 55.847\,\frac{g}{mol}[/tex]
La masa atómica del hierro es 55.847 gramos por mol.
giving brainlyest to whoever completes my question
Answer:
What question?
Explanation:
Answer:
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The products of the reaction CaF2 + Br2 → CaBr2 + F2 are formed by reacting calcium fluoride with bromine. If equal moles of each reactant were present, what would be the limiting reactant?
Answer:
there is no limiting reactant.
Explanation:
Given that:
CaF₂ + Br₂ -----> CaBr₂ + F₂
From the above equation;
We can see that there is an equal number of moles in the reactant side of the equation.
i.e.
one mole of CaF₂ reacts with one mole of Br₂.
Thus, there is no limiting reactant.
There will be no limiting reactants as the chemical equation has the reactant totally consumed and thus leading to no reactants.
We can see that there's an identical range of moles withinside the reactant aspect of the equation
CaF2 + Br2 → CaBr2 + F2 From the above equation;one mole of CaF2 reacts with one mole of Br2.What is reactant ?It is the substance that gets into the chemical reaction.
Thus, there's no proscribing reactant.
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Please explain your reasoning and give explanation of why you chose that answer
Answer:
a. Cellular Respiration produces more ATP than Anaerobic Respiration.
Explanation:
Cellular Respiration creates a total of 36-38 ATP per round. Anaerobic processes only produce 2 ATP per cycle.
what is happening to a reaction at equilibrium.
Answer:
A reaction at equilibrium implies that the concentration/amount of reactants & products present in that reaction don't change but will remain constant. It could also mean that the forward reactions and reverse reactions will occur at the same rates.
Explanation:
A reaction at equilibrium implies that the concentration/amount of reactants & products present in that reaction don't change but will remain constant. It could also mean that the forward reactions and reverse reactions will occur at the same rates.
The equation for photosynthesis is shown below .
Water + carbon dioxide > Glucose + Oxygen
Which compound contains the energy from the sun as a result of this process ?
Answer:
Glucose
Explanation:
Photosynthesis is the process of the transformation of the light energy from the Sun into stored chemical energy that can serves as the major source of energy in the food chain
The overall chemical equation for photosynthesis reaction can be presented as follows;
6CO₂(g) + 12H₂O(l) + Light Energy → C₆H₁₂O₆ + 6O₂ + 6H₂O
During cellular respiration, the energy in the glucose, C₆H₁₂O₆, is converted to energy stored in Adenosine Triphosphate (ATP) molecules which are released when the the ATP is converted into Adenosine Diphosphate (ADP)
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + Energy containing ATP
8)__MgCl2 +
Li2CO3 →
_MgCO3 +
LiCl Reaction Type:_
TT
Reaction type : Double-Replacement reactions
Further explanationGiven
Reaction
MgCl2 + Li2CO3 → MgCO3 + LiCl
Required
Balanced equation
Reaction type
Solution
Balanced equation
Li2CO3 (s) + MgCl2 (aq) → MgCO3 (s) + 2 LiCl (aq)
Double-Replacement reactions. Happens if there is an ion exchange between two ion compounds in the reactant to form two new ion compounds in the product
To predict whether this reaction can occur or not is one of them, the precipitation reaction.
MgCO3 is a precipitation compound
is solid iron pallets that are melted and drawn into wires is that chemical reaction
Answer:
It is not true that this is an example of a chemical reaction. This is a typical example of physical reaction.
Most physical changes are often phase changes.
A phase change is a change in the physical state of a body.
In this change, it is from solid to liquid.
Now new substances are formed.
When substances are changed from one form to another, it is a physical change.
In a chemical change, a new substance is formed at the end of the process.
Explanation:
yess of course
if you study the steps of melting the iron and makes the ores pure, you will know that there's many reaction happen to convert to wires
PLEASE HELP THIS IS THE LAST DAY AND IM FAILING!! PICTURE PROVIDED!! In this lab, what did the pennies represent? (im sorry if the words are small on the paper it makes me crop it so i had to put my camera farther away)
Answer:
The pennies represent the particles of the isotope either decaying, or staying the same after each shake. This is a random process.
In this lab, the pennies represent the nuclei of radioactive substances
What are radioactive substances?Radioactive substances are the unstable substances as they ahve unstable nuclei and will attain stability after the decay of nuclei in the form of emission of alpha, beta or gamma rays.
In the given lab report, the word pennies is used to represent the nuclei of radioactive substances which undergo radioactive decay or remain same.
Hence pennies is used to represent radioactive substances.
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