How compact a certain object or person is
Answer:
Density is a measure of mass per unit of volume.The average density of an object equal its total mass divided by its total volume.
will give brainliest for correct answer!!!
Which particles are gained and lost during a redox reaction?
A) electrons
B) protons
C) neutrons
D) positrons
Answer:
Atoms of Zn (s) lose electrons and are oxidized. Atoms of Zn (s) lose electrons and are reduced. There is a net loss of mass. There is a net gain of mass.
Explanation:
A proton has _______ charge.
Answer:
positive
Explanation:
Explanation:
A proton has positive charge ...
What are five things gravity can do
Which technology is unted to service versand
Answer: a computer
Explanation:
no one's even answering, so i'll just uh leave this here
Answer:
answering what???
Explanation:
Answer:
I answered
Explanation:
How many moles of Li3PO4 are in 2.2 L of a 0.6 M solution of Li3PO4? (remember Molarity=moles of solute/liters of solution)
Answer:
5 is the answer since I did this and got it rigt
Why would Pluto be colder than all of the other planets?
Answer:
Pluto is farthest from the sun and hence it receives extremely low energy of sun. The surface temperature of Pluto is about -240 !!!
Find the pH of a 3.50 x 10^-4 M H2SO4 solution (sulfuric acid).
Answer:
3.46
Explanation:
-log(3.50*10^-4) = 3.46
How do you know that an acid based reaction is completely neutralized?
Answer:
When an acid and a base react with each other, a neutralization reaction occurs, forming a salt and water. The water forms from the combination of the H + ions from the acid and the OH - ions from the base. Strong acids and strong bases completely dissociate, so the reaction yields a solution with a neutral pH (pH = 7).
Explanation:
Habitat loss due to the increasing human
population has caused
A. the number of extinctions to decrease
B. reductions in endangered species
C. increased biodiversity
D. decreased biodiversity
Answer:
D. decreased biodiversity
Explanation:
Habitat loss due to the increasing human
population has caused decreased biodiversity
4 × 10-5 cm in scientific notation
Answer:
400000
Explanation:
First, figure out what 10^5 is. It is 100000. Then multiply it by 4 and there is your answer!
Also if it is 4x10^-5, it is 0.00004!
Oh yeah! If you want it to be in scientific notation, it is: 4x10^5
Since that I didn't quite understand what you are trying to question, it is either 4x10^5 or 4x10^-5!
How much solute will remain undissolved when 180 g of potassium iodide is added in 100 cm3 of water at 30°C?
Answer:
[tex]m_{undissolved}=27g[/tex]
Explanation:
Hello,
In this case, we first define the solubility as the maximum amount of a solute that is completely dissolved in an specific amount of solvent and it is temperature-dependent. Thus for potassium iodide, its solubility at 30°C is 153 g per 100 cm3 of water, therefore, with the given amount, the undissolved amount results:
[tex]m_{undissolved}=180g-153g=27g[/tex]
Best regards.
How many moles are in 0.423 g of Ca
In calculating the mass of an atom the mass of the electrons is essentially
Answer:
Sex
Explanation:
when solid surfaces slide over each other, the kind of friction that occurs is _ friction
When solid surfaces slide over each other, the kind of friction that occurs is called Sliding Friction.
Answer for number 9 i need it asap thank you
Answer:
a) Trichloromethyl
b) Trinitrogen Pentoxide
c) Carbogen
Explanation:
Draw the principal organic product expected when 2-methylthiophene reacts with hno3. show minimized formal charges, if applicable.
Answer:
2-Methyl-5-nitrothiophene
Explanation:
The 2- and 5-positions of thiophene are the most susceptible to electrophilic aromatic substitution.
Thus, the major product from the reaction of 2-methylthiophene with HNO₃ in acetic acid is 2-methyl-5-nitrothiophene.
what do many bases have in common
Answer:
they often form hydroxide ions
Explanation:
Iodine-131 is a radioactive isotope, and is often used in certain medical treatments. It has a short half-life of about 8 days. If a hospital has a 750mg sample of it available, how much would be available after 48 days?
Iodine-131 is a radioactive element which keeps on decaying over the time. Decay of radioactive element always comes under first order kinetics. Therefore 16.2mg mass would be available after 48 days if a hospital has a 750mg sample of it available.
What is half life?Half life tells about the time at which the radioactive material decays to half of its initial concentration.
Mathematically, for first order reaction, the relationship between half life and rate constant can be given as
[tex]t_{1/2} = \frac{0.693}{K}[/tex]
where k = rate constant
[tex]t_{1/2} \\[/tex]= half life= 8 days
Substituting the given values
k=0.693÷8 =0.08days⁻¹
[tex]k=\frac{2.303}{t}log\frac{a}{a-x}[/tex]
a= initial concentration
a-x = final concentration after 48 days
[tex]0.08=\frac{2.303}{48 }log\frac{ 750}{a-x}[/tex]
solving this we get
a-x= 16.2mg
Therefore, 16.2mg mass would be available after 48 days if a hospital has a 750mg sample of it available.
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What volume of product is produced when 20.0 Mg of liquid hydrogen reacts with
excess liquid oxygen in a rocket propellant reaction? The gas is formed at 101.325 kPa and 40˚ C
Answer: The volume of product formed is 0.26 L
Explanation:
[tex]\text{Moles of solute}=\frac{\text{given mass}}\times{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} H_2=\frac{0.02g}{2g/mol}=0.01moles[/tex]
[tex]2H_2(l)+O_2(l)\rightarrow 2H_2O(g)[/tex]
As [tex]O_2[/tex] is the the excess reagent, [tex]H_2[/tex] is the limiting reagent as it limits the formation of product.
According to stoichiometry :
2 moles of [tex]H_2[/tex] give = 2 moles of [tex]H_2O[/tex]
Thus 0.01 moles of [tex]H_2[/tex] will give =[tex]\frac{2}{2}\times 0.01=0.01moles[/tex] of [tex]H_2O[/tex]
According to ideal gas equation:
[tex]PV=nRT[/tex]
P = pressure of gas = 101.325 kPa = 1 atm
V = Volume of gas = ?
n = number of moles = 0.01
R = gas constant =[tex]0.0821Latm/Kmol[/tex]
T =temperature =[tex]40^0C=(40+273)K=313K[/tex]
[tex]V=\frac{nRT}{P}[/tex]
[tex]V=\frac{0.01mol\times 0.0821L atm/K mol\times 313K}{1atm}=0.26L[/tex]
Thus the volume of product formed is 0.26 L
13) State four factors that can disrupt the
balance of the ecosystem-
Answer:
habitat change, climate change, invasive species, and pollution
Explanation:
Answer:
I’m looking for an answer aswell
Explanation:
When you standardized the Na2S2O3, what molarity of Na2S2O3 did you obtain?
V(Na2S2O3): 6.5 ml
V(KIO3)L: 5.0 ml
stoichiometric factor ( number of moles of Na2S2O3 reacting with one mole of KIO3): 6
Answer:
0.46M NaS₂O₃ (Assuming KIO₃ solution with a concentration of 1.0M)
Explanation:
Based on the reaction:
6 Na₂S₂O₃ + KIO₃ + 5 KI + 3 H₂SO₄ → 3 Na₂S₄O₆ + 3 H₂O + 3 K₂SO₄ + 6 NaI
6 moles of Na₂S₂O₃ react per mole of KIO₃
Assuming the molarity of the KIO₃ solution is 0,1M:
Moles of KIO₃: = 5.0x10⁻³L ₓ (0.1 mol / L) = 5.0x10⁻⁴ moles
As 6 moles of thiosulfate reacted per mole of iodate:
5.0x10⁻⁴ moles KIO₃ ₓ (6 moles Na₂S₂O₃ / 1 mole KIO₃) =
3.0x10⁻³ moles of Na₂S₂O₃. In 6.5mL (6.5x10⁻³L):
3.0x10⁻³moles Na₂S₂O₃ / 6.5x10⁻³ L = 0.46M NaS₂O₃
Determine whether or not the equation below is balanced. If it isn’t balanced, write the balanced form. Also, identify the reactant(s) and product(s) in this equation. Finally, label this as one of the five types of reactions: combination, decomposition, substitution, double replacement, or reversible.
Answer:
This is a balanced equation because the same types of atoms and the same numbers of each atom are present on both sides of the equation. 8 S atoms are found on both sides of the equation, and 48 F atoms are found on both sides of the equation. S8 and 24F2 are the reactants; 8SF6 is the product. This is a combination reaction because two substances (S8 and 24F2) undergo a chemical union to form a more complex substance (8SF6).
S8+24F2→8SF6
Explanation:
Volume is the
variable, and the
temperature of the gas is the
variable.
DONE
Answer:
Volume is the dependent variable, and the
temperature of the gas is the independent variable.
Explanation:
Variables Independent Variable: temperature; Dependent Variable: volume
Constants: pressure and number of molecules
"Volume is the variable, and the temperature of the gas is the variable," it means that volume and temperature are both variables in a certain context or scenario.
A variable is a factor or quantity that can change or vary in value. In this case, volume and temperature are the variables being discussed.
Volume refers to the amount of space occupied by a gas. It can be altered by changing the physical conditions of the system, such as adding or removing gas molecules or changing the container size.
Temperature, on the other hand, refers to the measure of the average kinetic energy of the gas molecules. It determines the speed and energy of the gas particles. Temperature can be modified by adding or removing heat from the system.
Both volume and temperature play crucial roles in understanding the behavior of gases, particularly in gas laws such as Boyle's Law, Charles's Law, and the Ideal Gas Law.
Therefore, volume and temperature are being identified as variables that can be independently manipulated or observed to study the behavior of gases or analyze specific gas-related phenomena.
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Your question is incomplete, but most probably your full question was.
"Volume is variable, and the temperature of the gas is variable". Explain this statement.
Find the specific heat of an unknown material with an initial temperature of 20°C, when 5000 Joules are applied to a 50 gram sample and the final temperature is 70°C
Answer:
2J/g°C
Explanation:
Q = 5000J
Initial temperature (T1) = 20°C
Final temperature (T2) = 70°C
Specific heat capacity (c) = ?
Heat energy (Q) = mc∇T
Q = mc∇T
Q = mc(T2 - T1)
5000 = 50 × c × (70 - 20)
5000 = 50c × 50
5000 = 2500c
c = 5000 / 2500
c = 2J/g°C
The specific heat capacity of the substance is 2J/g°C
Help ASAP it’s pass due
Answer:
I think its city y, I don't know if its right though.
Explanation:
What can be said about 1 mole of Ag and 1 mole of Au?
Explanation:
Avogadro's number. What can be said about 1 mol Ag and 1 mol Au? ... They contain the same number of atoms.
1 mole of Ag and 1 mole of Au contain the same number of particle. Therefore, option B is correct.
What is mole ?The International System of Units uses the mole (symbol: mol) as the unit of material quantity. How many elementary entities of a particular substance are present in an object or sample is determined by the quantity of that material. It is specified that the mole contains exactly 6.022140761023 elementary entities.
A mole is defined as the mass of a substance that has the same number of elementary particles as there are atoms in precisely 12.000 g of 12C.
In the periodic chart, group 11 includes the chemical elements roentgenium (Rg), copper (Cu), silver (Ag), and gold (Au). However, no chemical tests have yet been done to demonstrate that roentgenium behaves similarly to the heavier homologue of gold.
Thus, option B is correct.
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For 1 dish of potato wedges, you will need 5 potatoes , 2tbs pepper, and energy. You need to make 80 batches of potato wedges. How many potatoes do you need? Do you have enough?
Answer: you will need 400 potatoes
Explanation:
13. Hydrogen and helium have both been used to fill balloons. Which property of helium
makes it the preferred choice to hydrogen?
Answer:
Helium is lighter than Hydrogen and Helium is a much safer gas.
Answer:
Helium gas is known to be very light which makes it a preferred choice to hydrogen. Helium has low boiling point, low density, low solubility, high thermal conductivity and inertness. Since it is less dense, it is considered suitable for filling balloons.
a b c d e f g h i j k l m n o p q r s t u v w x y z
Answer:
B
Explanation:
The answer is substitution