Answer:
0.95
Explanation:
trust
When two atoms form a molecule, the molecule has lower energy than the two separate atoms. However, when only two atoms are present, they bounce off each other and do not form a molecule. Explain what happens to the energy of the atoms when there are only two atoms and they collide.
DONT GIVE ME A LINK!!
Answer:
they end up bouncing against each other instead of merging together
Explanation:
Which of the following is an example of a molecular element?
a.NaCl b. CO2 c. Na d. O2
Answer:
oxygen (O2) is a molecular element
Explanation:
Molecular compound are chemical compounds that take the form of discrete molecules.
atomic element is an element which occurs independently as atoms and can react with other elements to form a compound
Ionic compounds are the compound which on dissolution form ions in solution
Mixture is the composition of different compounds
which substance has a mass is 13.5 grams, and its volume is 5 cm 3.
Answer:
Substance is Aluminium
Explanation:
We are given;
Mass; m = 13.5 grams
Volume; V = 5 cm³
Formula for density is;
density = m/V
Density = 13.5/5
Density = 2.7 g/cm³
From the table attached, we can see that the element with a corresponding density of 2.7 is Aluminium
If the graph of y = a x 2 + b x + c does not intersect the x -axis, then what is true about the roots? Both are real roots. Both are real roots. Both are imaginary roots. Both are imaginary roots. One is a real root, and one is irrational. One is a real root, and one is irrational. One is a real root, and one is rational.
Answer:
Both roots are imaginary roots.
Explanation:
Consider these things:
If we try to solve x²+1 = 0, notice that we aren't able to solve the equation in Real Number system because there are no negative outputs for quadratic function.
Remember that quadratic function has range greater or equal to the max-min value.
x-axis plane represents the solutions of that equation. If a graph intersects x-axis plane then it has a solution.
While a graph that doesn't have any intersects on x-plane, it means that the equation for that graph doesn't have real solutions but imaginary solutions.
As you may notice some of parabola graph has one intersect, two intersects or none. One intersect is one solution to the equation — Two intersects are two solutions of the equation and lastly, no intersects mean that no real solutions and remain only imaginary solution.
Mr. Ragusa is approached in his lab by one of his students named Hassan. Hassan had found a bottle of nitric acid that did not have a labeled molarity and wanted Mr. Ragusa to help him find it's molarity. Mr. Ragusa filled a buret to 4.85 mL with 0.30 M NaOH. Mr. Ragusa added 5 mL of the acid to a flask and added some phenolphthalein. Mr. Ragusa hit the titration spot on, and the final volume in the buret was 43.69 mL. What is the concentration of the Nitric Acid?
Round your answer to 2 decimal places. Include a unit in your answer. (ex: 1.2M)
HNO3 + NaOH --> NaNO3 + H2O
Answer:
2.33M
Explanation:
1. First, make sure the equation is balanced. In this case it would be HNO3+NaOH --> NaNO3 + H2O. (it is already balanced here.)
2. Find the initial volume, final volume, the volume of acid, volume of NaOH.
a. Initial Volume: 4.85 mL
b. Final Volume: 43.69
c. Acid (HNO3) Volume: 5 mL
d Volume NaOH: Initial V - Final V --> 43.69 mL - 4.85 mL = 38.84 mL NaOH
3. Find moles of NaOH reacted using the volume from D. Convert this volume into Liters. Multiply the volume of NaOH by molarity of NaOH given to you before. (.30 M NaOH)
a. x mol NaOH/ .03884 L = .30 mol NaOH/ 1 mol = .011652 mol NaOH
4. Now find the moles of acid. The acid given to you in the equation is HNO3. The .011652 mol NaOH is from the moles reacted that you just found. The moles on the right side would be the co-efficient in front of the elements in the equation. Since this equation does not have any coefficients (it's already balanced), it would just be 1.
a. .011652 mol NaOH/ x mol HNO3 = 1 mol NaOH/ 1 mol HNO3.
x = .011652 mol HNO3
5. Now find the concentration, also known as molarity. Divide the .011652 mol by the volume of acid you have been given (5 mL). Before using 5 mL, divide it by 1000 to get the Liter form.
a. .011652 mol HNO3/ .005 L = 2.3304 M HNO3
I hope you understand now. God bless!
Help i’m taking a test!!
What new element is formed from the equation below? (Answer form is
MN:, AN: , S)
Answer:
Element Z
Explanation:
I hope this is correct and helps you!
A man needs to lift a heavy box on the back of a truck or push up a ramp or lift it straight up from the ground to use around he won't have to move the box over a longer distance what did is the benefit of using a ramp to get the box
M
Mass can be measured in local units like dharni pau eto. Discuss the advantages of using
standard units of mass over the local units of mass. (Any two points)
N2 Points)
soup answer
Answer:
1.They are reliable.
2.They dont vary from person to person
Describe and show an example of valence electrons. What is a common trend you can remember to help you understand valence electrons?
Explanation:
valency from right to left in a Periodic Table in same period first increases then decreases and from top to bottom it is same for a same group
Neptune _____.
is a terrestrial planet
has a nearly horizontal axis
was discovered by mathematical calculations
is the largest planet in the solar system
Answer:
C. Was Discovered by Mathematical calculations
Explanation:
Terrestrial Planets are Inner Planets (Mercury,Venus,Earth,Mars) and Neptune is an ice giant or gas giant, Neptune is also not the largest planet in the solar system, I believe that's Jupiter. I don't know for sure if Neptune has a horizontal axis but my best guess is C. I hope this helps! :^)
Please help is for my final An example of a chemical change is-
evaporation of seawater
о
sublimation of dry ice (CO2)
melting of aluminum
burning wood reducing it to ashes
Explanation:
Souring of milk
Baking of cake
What are some of the issues facing the ocean ( give at least 3 )
Answer:
Pollution
Overpopulation
Destruction of habitats
Explanation:
What are the three parts of modern cell theory. Choose all that apply.
A.) The cell is the smallest living unit in organisms
B.) All cells come from other pre-existing cells
C.) All living things are made of cells
D.) All organisms are multicellular
Answer:
a,b,c
Explanation:
Answer:
C
...................
Why are shadows shorter around noon?
Make sure you give a full, detailed answer, not just one sentence.
Answer: Answer is in the Explanation.
Explanation: At noon the sun is directly above in the sky, the sun's rays are falling on the body making the shadow smaller. While in the evenings and mornings the sun is at a inclined position, so the sun's rays are falling at a inclined position making the body's shadow larger.
I looked it up on the internet and reworded it as good as I could.
During a combustion reaction, 9.00 grams of oxygen reacted with 3.00 grams of CH4.
What is the amount of the leftover reactant?
0.74 grams of methane
0.89 grams of methane
1.22 grams of oxygen
1.45 grams of oxygen
Answer:
0.74
Explanation:
this is the correct answer. I followed a correct answer that had the same probelm with different values, swithxed it with mine, and got 0.75. So its basically 0.74
A 125.0-g sample of a metal heated to 100.0 ∘C and placed in a calorimeter that contains 250.0 g of water. The temperature rises from 24.3 ∘C to 27.2 ∘C. What is the specific heat capacity of the metal? Ignore the calorimeter in your analysis. Group of answer choices
Answer:
0.333J/g°C is the specific heat of the metal
Explanation:
The heat that the metaal gives is equal to the heat that water is absorbing. The equation is:
S(metal)*ΔT(metal)*Mass(metal) = S(H2O)*ΔT(H2O)*Mass(H2O)
Where S is specific heat, ΔT is change in temperature and mass the mass in grams of the metal and water.
Replacing:
S(metal)*(100.0°C-27.2°C)*125.0g = 4.184J/g°C*(27.2°C-24.3°C)*250.0g
S(metal) = 4.184J/g°C*(27.2°C-24.3°C)*250.0g / (100.0°C-27.2°C)*125.0g
S(metal) = 0.333J/g°C is the specific heat of the metal
how many moles in 200 grams of Br
Awnser all of them if you can its really EASY im feelin generous today 30 pts
Answer: 1. Synthetic Substance or Synthetic compound 2. Oil 3. Biofuels 4. Salt and Sugar 5. medicine 6. Synthetic 7. Background Knowledge and Visualizing
Explanation: Hope this helps! Good luck!
Answer:
1= synthetic substance
2= natural gas
3= alcohol
4=artificial musks
5= medicine
6= synthetic
7=Questioning the Text
Explanation: If my answers are correct please mark me as a brainlist.
Consider the reaction.
2HF(g) +
H2(g) + F2(g)
At equilibrium at 600 K, the concentrations are as follows.
[HF] = 5.82 x 10-2 M
[H2] = 8.4 x 10-3M
[F2] = 8.4 x 10-3M
What is the value of Kea for the reaction expressed in scientific notation?
O 2.1 x 10-2
102.1 x 102
1.2 x 103
0 1.2 x 10-3
Answer:
0.021
Explanation:
Step 1: Write the balanced equation
2 HF(g) ⇄ H₂(g) + F₂(g)
Step 2: Calculate the value of the concentration equilibrium constant
The concentration equilibrium constant (K) is equal to the product of the concentrations of the products raised to their stoichiometric coefficients divided by the product of the concentrations of the reactants raised to their stoichiometric coefficients.
K for this reaction is:
K = [H₂] × [F₂] / [HF]²
K = (8.4 × 10⁻³) × (8.4 × 10⁻³) / (5.82 × 10⁻²)² = 0.021
What is the acceleration of a 7 kg
mass being pulled by a 56 N force?
Answer:
8 meters per second per second
Explanation:
Newton's second law: [tex]f=ma[/tex], force = mass multiplied by acceleration.
Therefore 56 / 7 = acceleration = 8
Which of these is a polar molecule?
1. SH2
2. CO2
3. F2
calculate the ph of the solution [oh-] = 1x 10-11 m
a. 11.0
b. 12.0
c. 2.7
d. 3.0
Answer:
d. 3.0
Explanation:
First we calculate the pOH of the solution, using the following formula:
pOH = -log[OH⁻]pOH = -log[1x10⁻¹¹ M]pOH = 11.0Using the pOH we can calculate the pH of the solution, keeping in mind the relationship between pH and pOH:
pH = 14.0 - pOHpH = 14.0 - 11.0pH = 3.0The answer is option d.
Which best describes the purpose of a fever?
Answer:
when you have a fever your body is trying to fight off a virus or some other kind of bad Bacteria
Explanation:
I think this because everyone has at least had a fever when they were sick and when you are sick you are likely to have a fever because your body is fighting off a bad bacteria
The name for the process that causes fertile land to become dirt-like is??
Deforestation
Urbanization
Construction
Desertification
Answer:
Desertification?
Explanation:
Desertification is when fertile lands become desert like
Lead, gold mercury, aluminum which one has the lowest heat capacity?
How many moles are in a solution with a concentration of 5 M and a volume of 0.25 L?
Answer:
160 mL
Explanation:
A substance has a boiling point of 78 °C. Which of the following is true about the substance? (5 points) a It will also change from a gas to a solid at 78 °C while the gas loses energy. b It will also change from a gas to a solid at 78 °C while the gas gains energy. c It will also change from a gas to a liquid at 78 °C while the gas loses energy. d It will also change from a gas to a liquid at 78 °C while the gas gains energy.
Answer: If a substance has a boiling point of [tex]78^{o}C[/tex] then it is true that it will also change from a gas to a liquid at 78 °C while the gas loses energy.
Explanation:
The temperature at which vapor pressure of a liquid substance becomes equal to the atmospheric pressure is called boiling point of substance.
At the boiling point, liquid phase and vapor phase remains in equilibrium.
This means that as liquid phase changes into vapor phase and also vapor phase changes into liquid phase at the boiling point.
Thus, we can conclude that if a substance has a boiling point of [tex]78^{o}C[/tex] then it is true that it will also change from a gas to a liquid at 78 °C while the gas loses energy.
The equilibrium of 2H2O(g) 2H2(g) + O2(g) at 2,000 K has a Keq value of 5.31 x 10-10. What is the Keq expression for this system?
A) [H2}^2[O2} / [H2O]^2
B) [H2][O2] / [H2O]
C) [H2O]^2 / [H2]^2[O2]
D) [H2O]^2 / [H2][O2]
Answer:
B
Explanation:
I don't know how to explain this but you get it
If a book has a weight of 23.2 N on Earth, what is its mass?
Answer: Mass is 2,37 kg
Explanation: Weight G = mg, and g = 9.81 m/s² on Earth.
m = W/g = 23.2 N / 9.81 m/s²
what is zinc chemical formula?
Answer:
Zn+2
Explanation:
I'm sorry if its wrong but have a good one!