Answer:
d=0.4cm
t=0.25km
v=7s of 100m
i hope it helps you
this is my asnwer
correct me if im wrong
#carryonlearning
what are radioactive tracers used for
Answer:
Radioactive tracers are widely used to diagnose industrial reactors, for instance by measuring the flow rate of liquids, gases and solids.
Explanation:
Radioactive tracers are widely used to diagnose industrial reactors, for instance by measuring the flow rate of liquids, gases and solids. A radioactive tracer is a chemical compound in which one or more atoms have been replaced by a radioisotope.
heres the link for more information
https://www.iaea.org/topics/radiotracers#:~:text=Radioactive%20tracers%20are%20widely%20used,been%20replaced%20by%20a%20radioisotope
.
Which of the following an ionic bond like what holds Na+ and Cl- together in NaCl?
(Hint: Ionic bonds form between metals & non-metals.)
a
The chemical bond that holds H+ and N3- together in NH3
b
The chemical bond that holds Be2+ and Cl- together in BeCl2
c
The chemical bond that holds B3+ and Cl- together in BCl3
d
The chemical bond that holds H+ and Cl- together in HCl
Answer:
Rb
Explanation:
Rb look closely
What is the molarity of a 9.13 L soda that contains 13.83 of sugar?
Answer:
1.52 M
Explanation:
Molarity of a solution is calculated as follows:
Molarity = number of moles (n) ÷ volume (V)
Based on the information given in this question,
Volume of soda (V) = 9.13 L
number of moles = 13.83 mol
Molarity = 13.83 ÷ 9.13
Molarity = 1.52 M
A 0.885 M solution of KBr whose initial volume is 82.5 mL has more water added until its concentration is 0.500 M. What is the new volume of the solution?
Answer:
[tex]V_2=146mL[/tex]
Explanation:
Hello there!
In this case, since the equation for the calculation of dilutions is:
[tex]M_1V_1=M_2V_2[/tex]
Whereas M is the molarity and V the volume, because the final concentration is lower than the initial. Thus, since we are asked to calculate the final volume, we solve for V2 as follows:
[tex]V_2=\frac{M_1V_1}{M_2}=\frac{0.885M*82.5mL}{0.500M}\\\\V_2=146mL[/tex]
Best regards!
Help ASAP brainly if you get it right for me please …
Answer:
Explanation:
The answer would be d
What’s a element that is a metal, contains 1 valance electron, 3 energy levels?
Explanation:
Sodium is the element having one valance electron and 3 energy level and is a metal.Its atomic number is 11 .So in first energy level ,there is 2 electrons ,in second energy level,there is 8 electrons and in third energy level,there is one electron.The one electron in the third energy level is called valance electron and it is a metal in the sence it has only one valance electron and it can easily loose it and gain +ve charge.
When the head of a match burns, chemical reaction is taking place. But a certain amount of energy is required to get this reaction started. This is the reactions activation energy. Describe where this energy comes from. What provides this energy?
Answer:
Rubbing the match against a rough surface
The activation energy is provided by friction between surfaces
Explanation:
Activation energy is the energy required to start a chemical reaction. It is the minimum energy that must be supplied for a reaction to proceed.
When we strike a match against a rough surface, what we are trying to do is to supply the required activation energy in the form of friction in order to get the combustion reaction started.
Hence, the activation energy for the combustion of a match head is supplied by friction when the match head is struck against a rough surface.
A 25.0mL solution of KOH is neutralized with 30.3 mL of 0.100M HBr. What is the concentration of the original KOH solution?
Answer:
The concentration of the original KOH solution is 0.1212 M.
Explanation:
Dilution is the process to reduce the concentration of solute in solution. This is accomplished by adding more solvent to the same amount of solute. In other words, dilution is the procedure followed to prepare a less concentrated solution from a more concentrated one, and it simply consists of adding solvent to an existing solution.
As only solvent is being added, the consequence is that by not increasing the amount of solute, but if the amount of solvent, the concentration of the solute decreases.
The expression for the dilution calculation is:
Ci* Vi = Cf* Vf
where:
Ci: initial concentration Vi: initial volume Cf: final concentration Vf: final volumeIn this case:
Ci= ? Vi: 25 mL Cf: 0.1 M Vf: 30.3 mLReplacing:
Ci* 25 mL= 0.1 M* 30.3 mL
Solving:
[tex]Ci=\frac{0.1 M*30.3 mL}{25 mL}[/tex]
Ci=0.1212 M
The concentration of the original KOH solution is 0.1212 M.
Consider the Hertzsprung Russell diagram seen here. We can use this diagram to classify stars and determine their characteristics.
The color of a star is determined by its temperature: the hottest stars are blue and the coolest are red. The Sun has a surface
temperature of 5,500°C and it appears yellow. The diagram also indicates that temperature coincides with luminosity: the hotter the
star, the higher the luminosity. You can also tell the size of each star from the graph as the larger the radius, the higher the
temperature and luminosity. Regardless of a star's position in the diagram, the energy that results in high temperatures and the stars
luminosity is generated by what process?
W
A)
nuclear fusion
B)
nuclear fission
gravitational forces of swirling gases
D)
friction generated by gravitational force
Answer:
Explanation:
A- nuclear fusion
what do mars, pluto, and Jupiter have in common (science) in 8th grade.
Answer:
they are all planets
Explanation:
When maganese dioxide is added to hydrogen chloride you get water maganese dichloride and chlorine gas write the balanved equation
Answer: When maganese dioxide is added to hydrogen chloride you get water maganese dichloride and chlorine gas then balanced equation is [tex]MnO_{2} + 4HCl \rightarrow 2H_{2}O + MnCl_{2} + Cl_{2}[/tex].
Explanation:
The word equation is given as maganese dioxide is added to hydrogen chloride you get water maganese dichloride and chlorine gas.
Now, in terms of chemical formulae this reaction equation will be as follows.
[tex]MnO_{2} + HCl \rightarrow H_{2}O + MnCl_{2} + Cl_{2}[/tex]
Here, number of atoms on reactant side are as follows.
Mn = 1O = 2H = 1Cl = 1Number of atoms on product side are as follows.
Mn = 1O = 1H = 2Cl = 4To balance this equation, multiply HCl by 4 on reactant side and multiply [tex]H_{2}O[/tex] by 2 on product side. Therefore, the equation can be rewritten as follows.
[tex]MnO_{2} + 4HCl \rightarrow 2H_{2}O + MnCl_{2} + Cl_{2}[/tex]
Hence, number of atoms on reactant side are as follows.
Mn = 1O = 2H = 4Cl = 4Number of atoms on product side are as follows.
Mn = 1O = 2H = 4Cl = 4Since, this equation contains same number of atoms on both reactant and product side. Therefore, this equation is now balanced equation.
Thus, we can conclude that when maganese dioxide is added to hydrogen chloride you get water maganese dichloride and chlorine gas then balanced equation is [tex]MnO_{2} + 4HCl \rightarrow 2H_{2}O + MnCl_{2} + Cl_{2}[/tex].
Use the periodic table to compare the sizes of ionic radii with the corresponding atomic radii or other
ionic radii. Choose from smaller and larger in the blanks below:
A sodium cation is
than a sodium atom.
A phosphorus anion is
than a phosphorus atom.
A magnesium ion is
than a sodium ion.
A chlorine ion is
than a phosphorus ion.
A potassium ion is
than a sodium ion.
1. smaller
2.smaller
3.larger
4.larger
5.smaller
2. ... its Larger. because The extra electrons add to the volume of the atom. Since they're just filling in levels that are already partially filled, it isn't by much, but they do push on the other electrons by way of their charge, decreasing the density of the 3-minus ion relative to that of the neutral atom.5.Na+ ions are smaller than K+ ions because K+ ions are farther down the periodic table, which causes atomic radius to increase because the strength of the bonds decreases (there are more elementary particles to attract, i.e. electrons, protons, neutrons), and they become more spread out. Also, K+ has more protons than Na+ ions. so yeah thats how i got my answer ever thou i got number 2 wrong
Answer:
Smaller
Larger
Smaller
Smaller
Larger
Explanation: Just correcting someone else's answer.
which wavelength of the band on the hydrogen emission line spectrum that has the most energy ? a. 410nm b.434nm c.486nm d.656nm
Answer: 410 nm
Explanation: Energy of a photon is E = hf = hc/λ. The smaller wavelength λ, the greater energy
Newton's third law of motion States that for every action there is an equal and opposite reaction. Which of these illustrates newtons third law?
Answer:
This question lacks options, the options are:
A: Two students of similar mass run into each other. They bounce off each other when they collide.
B: Two students of similar mass run side by side into a wall and punch holes of equal size before emerging on the other side.
C: Two students of similar mass run in opposite directions, but one accelerates at twice the rate of the other.
D: Two students of similar mass run at the same speed in opposite directions on a track. They will collide with 400 Newtons of force in 400 meters.
The answer is A.
Explanation:
Isaac Newton proposed three laws, which he called laws of motion. The third of these laws states that for every action, there is an equal and opposite reaction. This means that if an object A collides with object B, object B will exert a force of similar magnitude but in opposite direction on object A.
From the examples in the option, when two students of similar mass run into each other. They bounce off each other when they collide. This means that student 1 and student 2 will go in opposite directions after collision with one another. This portrays Newton's third law of motion.
Students studying solid-state
physics are discussing the
microscopic structure of
materials.
Which student's statement
correctly identifies the nature
of these materials?
Answer:Material X would be classified as a crystalline solid because atoms are in a highly ordered three-dimensional arrangement.
Explanation: it makes sense I'm sorry if its wrong
Can someone please help me with this question???
Answer:
C.
Explanation:
I looked it up.
7. If the pressure of a gas is 1.03 atm and the volume is 250 mL, then if the pressure is decreased to 0.95 atm, what is the new volume?
Answer:
V2 = 271.1 ml
Explanation:
Given:
P1 = 1.03 atm
V1 = 250 ml
P2 = 0.95 atm
V2 = ?
P1V1 = P2V2
V2 = (P1/P2)V1
= (1.03 atm/0.95 atm)(250 ml)
= 271.1 ml
What would be the volume, in liters measured at STP, of 9.75 moles of carbon monoxide?
I
If there were 11.25 moles of solute in a 6.0M solution, what volume would it have?
Answer:
1.875 dm^3
Explanation:
M = moles of solute ÷ volume of solution
M =11.25 x 6
= 1.875 dm^3
2L is the correct answer .
HOW TO CALCULATE ??
Given : moles of solute(n) = 11.25Molarity (M) = 6
To Find : Volume of the solution (v) = ?Key concept : [tex]M=\frac{n}{V(inL)}[/tex]On puting values and solving we get , V = 1.875 L ≈ 2L
Learn more about molarity at https://brainly.com/question/19943363
#SPJ2
ILL GIVE YOU BRAINLIEST!!The type of biome that we live in here in Knightdale, NC is what? *
1 point
A Tundra
A Savannah
A Tropical Rainforest
A Temperate Deciduous Forest
A Temperate Rainforest
A Boreal Forest
Answer:
Temperate Deciduous Forest
Explanation:
Cecilia finds this cell under the microscope:
How does she know it is an animal cell?
A It does not have a cell wall.
B It has a cell membrane.
C It has a nucleus.
D It is round.
Answer:
all of the above options is correct because animal cell have all the mention features.
hope it helps you have a great day keep smiling be happy stay safe ☺️
Which two planets are the largest? Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune
Answer:
Jupiter and Saturn are the two biggest planets
Which results in a chemical change?
A. A teacher feels a rough cloth
B. A student colors a blue paper
C. A student smells a flower
D. A teacher lights a candle
Answer:
D. I am pretty sure
Explanation:
:))))))
Answer:
D. A teacher lights a candle
Explanation:
If 5 moles of Al2O3 are formed in the reaction " 4 Al + 3 O2 ---> 2 Al2O3 " How many moles of Aluminum (Al) & How many moles of Oxygen (O2) are consumed in the reaction?
We are given the reaction:
4 Al + 3 O₂ → 2 Al₂O₃
___________________________________________________________
Finding moles of Al reacted:
from which, we can deduce that 4 moles of Al produces 2 moles of Al₂O₃
Ratio between their moles:
Moles of Al / Moles of Al₂O₃
4 / 2 = 2 / 1
so,
Moles of Al / Moles of Al₂O₃ = 2
Moles of Al = 2* Moles of Al₂O₃
we are given that 5 moles of Al₂O₃ are formed, replacing the value:
Moles of Al = 2*5
Moles of Al = 10 moles
___________________________________________________________
Finding moles of O₂ reacted:
from the given equation, we can also say that 4 moles of Al react with 3 moles of O₂
Moles of Al / Moles of O₂ = 4 / 3
3 * (Moles of Al) = 4* (Moles of O₂)
we know that 10 moles of Al reacted,
3 * (10) = 4 * (moles of O₂)
Moles of O₂ = 30/4
Moles of O₂ = 7.5 moles
2. If a gas at 500 mL has a temperature of 45°C, then what is the new volume when the temperature is increased to 65°C? Show your work.
Answer:
531.45 mL
Explanation:
From the question given above, the following data were obtained:
Initial volume (V₁) = 500 mL
Initial temperature (T₁) = 45 °C
Final temperature (T₂) = 65 °C
Final volume (V₂) =?
Next, we shall convert celsius temperature to Kelvin temperature. This can be obtained as follow:
T(K) = T(°C) + 273
Initial temperature (T₁) = 45 °C
Initial temperature (T₁) = 45 °C + 273
Initial temperature (T₁) = 318 K
Final temperature (T₂) = 65 °C
Final temperature (T₂) = 65 °C + 273
Final temperature (T₂) = 338 K
Finally, we shall determine the final volume of the gas. This can be obtained as follow:
Initial volume (V₁) = 500 mL
Initial temperature (T₁) = 318 K
Final temperature (T₂) = 338 K
Final volume (V₂) =?
V₁/T₁ = V₂/T₂
500 / 318 = V₂ / 338
Cross multiply
318 × V₂ = 500 × 338
318 × V₂ = 169000
Divide both side by 318
V₂ = 169000 / 318
V₂ = 531.45 mL
Therefore, the new volume of the gas is 531.45 mL
Can someone please check my answer?
yes correctly ☺️☺️
Explanation:
thank you ❣️
Which property is shared by both acids and bases?
1. changes red litmus paper to blue
2. feels slippery
3. conducts electricity in aqueous solution
4. tastes sour
O 1
2
4
3
[tex]\huge{\textbf{\textsf{{\color{navy}{An}}{\purple{sw}}{\pink{er}} {\color{pink}{:}}}}}[/tex]
3. Conducts electricity in aqueous solution.
ThanksHope it helps.Which of the following would you expect to happen to a sample of water with the salt potassium iodide (KI) added to it?
A. Vapor pressure lowering
B. All of these
C. Freezing point elevation
D. Boiling point depression
Answer: d
Explanation:
The correct answer is A: Vapor pressure lowering.
Certain properties in chemistry are called colligative properties. These colligative properties depends on the amount of solute present.
Examples of colligative properties include;
Vapor pressure loweringFreezing point depressionBoiling point elevationOsmotic pressureWhen a solute is introduced into water, the vapour pressure of water is lowered.
Hence, when KI is added to a sample of water, vapor pressure lowering occurs.
https://brainly.com/question/10323760
B. What do you notice about the density of the sinking objects? Dense objects feel very heavy for their size
Answer:
The answer is below
Explanation:
The density of an object is its mass per unit of volume. Dense objects feel very heavy for their size, while for objects with low density they are very light for their size.
Density is the ratio of mass to volume; it is given by:
Density (D) = mass (m) / volume (V)
An object sinks in water if the density of the object is greater than the density of water. While an objects floats on water if the density of the object is les than the density of water
Why are nonnative species a threat to biodiversity?
A. They often use up resources that other organisms need
B. They are not able to successfully breed in the wild
C. They release pollution into many environments
D. They easily contract and spread diseases to other organisms
Answer:
A. They often use up resources that other organisms need.
Explanation:
Invasive alien species are animals, plants, fungi and microorganisms entered and established in the environment from outside of their natural habitat. T
hey reproduce rapidly, out-compete native species for food, water and space, and are one of the main causes of global biodiversity loss.
