Answer:
Radiation therapy is the use of high energy radiation to kill cancer cells.
Answer:
Radiation Therapy.
Explanation:
Also known as radiotherapy, it uses high-energy radiation to damage and/or kill cancer cells.
Calculate the standard enthalpy of reaction
for the reaction 2 Na (s) + 2 H₂O (l)
2 NaOH (aq) + H₂ (g), Standard enthalpies
formation are -285.8 kJ/mol for H₂O and -470. 11 kJ/mol for NaOH (aq).
Answer:
-368.62 kJ/mol
Explanation:
[(2 x - 470.11 kJ/mol) ( 0kJ/mol)] - [ 2 x -285.8 kJ/mol) (2x 0 kj/mol)] = -368.62 kJ/mol
Where is the youngest rock in the Atlantic Ocean found?
plz hurry
Answer:
Seafloor Ages
They found that the youngest rocks on the seafloor were at the mid-ocean ridges. The rocks get older with distance from the ridge crest.
hope this helped
2H₂ + O₂ → 2H₂O
Convert grams of H₂ to grams of H₂O.
a. 44,680 g H₂O
b. 5,000 g H₂O
c. 345676543 g H₂O
d. 3335 g H₂O
Answer:
500100 benswuer kers olá Marilene
The mass of H₂O is 44,680 g for the given reaction 2H₂ + O₂ → 2H₂O. Therefore, the correct option is option A.
What is mass?In physics, mass is a quantitative measurement of inertia, a basic characteristic of all matter. It essentially refers to a body of matter's resistance to changing its speed or location in response to the force that is applied. The change caused by either an applied force is smaller the more mass a body has.
The kilogramme, which is defined approximately equal to 6.6 × 10⁻³⁴ joule second in terms of Planck's constant, is the unit of mass inside the Worldwide System of Units (SI). A joule is equivalent to one kilogramme multiplied by one square metre per second. The mass of H₂O is 44,680 g for the given reaction 2H₂ + O₂ → 2H₂O.
Therefore, the correct option is option A.
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6. El oxígeno gaseoso se calienta a presión constate de 50 °C a 300 K. Se conoce que inicialmente el volumen del sistema era de 1,3 litros. ¿Cuál es el volumen final del sistema?
Answer:
El volumen final del sistema es 1.2L
Explanation:
La ley de Charles establece que el incremento de la temperatura de un gas produce un incremento en el volumen directamente proporcional cuando la presión permanece constante. La ecuación es:
V₁/T₁ = V₂/T₂
Donde V es volumen y T temperatura absoluta de un gas en 1, el estado inicial y 2, su estado final.
Reemplazando:
V₁ = 1.3L
T₁ = 50°C + 273.15K = 323.15K
V₂ = Incógnita
T₂ = 300K
1.3L/323.15K = V₂/300K
1.2L = V₂
El volumen final del sistema es 1.2LWater often has dissolved gases and other chemicals in it. When this water encounters rocks, the minerals in the rocks can be changed by the process of
what’s another term for weak solutions
If u mean in terms of concentration, it will be 'Dilute'
One that is almost or entirely ionized in water is considered to be a strong acid or alkali. Nitric acid, sulfuric acid, and hydrochloric acid are a few examples. Weak solutions are not ionized in water.
What is a weak solution ?Bases provide a similar problem: a strong base is one that is completely ionized in solution. A weak base is one that is less than 100% ionized in solution.
The fundamental elements that do not completely ionize in water are known as weak bases. Ammonia is one substance that is a weak base. A portion of NH3 that dissolves in water separates into ammonium cation.
An acid that partially separates into its ions in water or an aqueous solution is referred to as a weak acid. On the other hand, in water, a strong acid completely dissociates into its ions. While the conjugate acid of a weak base is also a weak acid, the conjugate base of a weak acid is also a weak solution.
Thus, Weak solutions are not ionized in water.
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What is the meaning of this painting
Answer: things arnent always as they seem
Explanation:
How many carbon (C) atoms are in CaCO3?
Answer:one atom
Explanation:
The carbon symbol is C so only one
Calcium has 1 atom
Oxygen has 3 atoms
Answer:
Only one Carbon atom
Explanation:
CaCO3 is composed of one atom of Calcium, one atom of Carbon and three atoms of oxygen
If you have 3 moles of calcium carbonate, how many grams of calcium bicarbonate are formed?
Answer:
hhjcioz xlioyudiyyxyisrupautwtritu regards Roy
Consider the data [X] [Y] [Z] initial rate M M M M · s −1 Exp 1 0.30 0.20 0.35 0.210 Exp 2 0.60 0.10 0.70 0.420 Exp 3 0.60 0.20 0.70 0.420 Exp 4 0.60 0.40 0.35 0.105 What is a correct rate law for the reaction?
Answer:
Rate = k [X]⁻¹ [Z]²
Explanation:
[X] [Y] [Z] initial rate M M M M · s −1
Exp 1 0.30 0.20 0.35 0.210
Exp 2 0.60 0.10 0.70 0.420
Exp 3 0.60 0.20 0.70 0.420
Exp 4 0.60 0.40 0.35 0.105
In Experiment 2 and 3 where the concentrations of Y and Z were constant, doubling the concentration of Y had no effect on the rate of the reaction. This means, that the rate of the reaction is zero order with respect to Y.
In experiment 3 and 4, dividing the concentration of Z by 2, causes the rate of the reaction to decrease by 4. This means the rate of the reaction is second order with respect to Z.
In experiment 1 and 4, doubling the concentration of X, causes the rate of the reaction to decrease by half. This means that X has an order of -1 with respect to the rate of the reaction.
The rate expression is given as;
Rate = k [X]⁻¹[Y]⁰[Z]²
Rate = k [X]⁻¹ [Z]²
What is the molarity of a 300.0 mL solution containing 25.0 g of NaCl?
Answer:
1,43 M
Explanation:
molair mass NaCl = 58,44 g/mol
You need to calculate how many moles 25 g is:
25 g / 58,44 g/mol = 0,4278 mol
0,4278 mol / 0,3 L = 1,43 M
Which of the following is considered a dilute solution? Choose all that apply.
Very sweet tea
Contact lens solution
Tide pods (laundry detergent)
Swimming pool water
Answer:
Very sweet tea
Explanation:
yeah... because sweet tea can cause tooth decay in our mouth thats why...(Please check the other answers also...Its all my point of view....thank you)
Clear selection
1 point
5. Choose the correct pair to
complete the given statement.
The size of the pupil _ (i) _ in
bright light to allow _ (ii) _ light
to enter our eyes.
O A. (i) increases and (ii) more
B. (i) decreases and (ii) more
O C. (i) increases and (ii) less
O D. (i) decreases and (ii) less
6. Which labelled part gives the 1 poi
human eye, its characteristic
colour
?
Answer:
I believe it is d! Reason being, when you cover your eyes with your hands for a period if time, and then move your hands, your pupils become wide, this means that when there is light your pupils are most like decreasing in size and allowing less light! :) hope this helps
Nepal is rich in species diversity why?? Explain with any three reason. Help this beginer out !!!
Answer:
Nepal is a multilingual, multiethnic, multicultural and multi-religious nation. Unity in diversity is the defining characteristics of Nepali society. Mutual coexistence, tolerance and cooperation have guided the people in achieving social cohesion, peace and happiness.
Explanation:
Please mark as brainliest!
very urgent
1. Describe an experiment to show the chemical effect of electric current.
2. State three conditions necessary for combustion
3. Describe all that you observe when a piece of iron is placed in copper sulphate solution for a
few minutes.
Explanation:
STEP 1- Take two iron nails.
STEP 2- Clean it with sand paper.
STEP 3- Wrap copper wire around both the nails. And connect the other end to the battery terminal.
STEP 4- Take water in beaker and little amount of salt in it or a few drpos of sulphuric acid in it.
STEP 5- Immerse the nails in the solution.
STEP 6- Observe the nails carefully. You can see bubbles of gases coming out from water near nails.
When, electeric current is passed through water gases like hydrogen and oxygen are evolved.
2.Three things are required in proper combination before ignition and combustion can take place---Heat, Oxygen and Fuel. There must be Fuel to burn. There must be Air to supply oxygen. There must be Heat (ignition temperature) to start and continue the combustion process.
When iron is placed in Copper sulphate solution, the iron is coated with a brown coloured substance "copper" and CuSo4 solution changes from blue to light green. This is due to iron displaces copper as it is more reactive than copper.
An iron loses electrons. State the type of charge it will end up with
write in your own words
Answer:
Most atoms do not have eight electrons in their valence electron shell. Some atoms have only a few electrons in their outer shell, while some atoms lack only one or two electrons to have an octet. In cases where an atom has three or fewer valence electrons, the atom may lose those valence electrons quite easily until what remains is a lower shell that contains an octet. Atoms that lose electrons acquire a positive charge as a result because they are left with fewer negatively charged electrons to balance the positive charges of the protons in the nucleus. Positively charged ions are called cations. Most metals become cations when they make ionic
What is the measurement between two points known as?
Answer:
The measurement between to points is known as the distance
what is the defination of epsom salt?
MARK ME BRAINLIST
What is the answer to the formula 12+6/2+10?
0 25
O 14
O 19
03.6
The answer was 25
Do according to bodmas rule
Help please!! I'll name you brainliest!!
Answer:
MgO
Explanation:
ahh help, is it true or false?
which of the following is and example of a chemical property?
SCIENCE
What is it called when two or more elements are brought together?
A. Solution.
B. Mixture.
C. Chemical reaction.
Answer:
C
chemical reaction .
Answer:
C
Explanation:
Chemical reaction.
gases are also good conductors of electricity in discharge tube at
1)high pressure high voltage
2) low pressure low voltage
3) low pressure high voltage
4) never
pls help wil marks as brainliest
Answer:
3)low pressure and high voltage
When elements are arranged according to increasing atomic number, there is a repeating, regular pattern of properties
This is called
periodic law
group
periodic table
family
Answer:
grpup
Explanation:
napagaralan namin yan
Which processes are part of the fast carbon cycle?
Answer:
Option C
Explanation: Pass me the brainliest I only need 1
Does hydrogen have similar physical properties to alkali metals?
Answer:
YESExplanation:
because it contain 1 electron in its outermost shellTwo forms of energy found in all systems are kinetic energy and
Answer:
Potential energy
Explanation:
BRAINLIEST IF YOU GET IT!! 5 STARS & A THANK YOU!!
Which of the following is a distinguishing difference between rocks and minerals?
A. Minerals are aggregates of different rocks and elements.
B. Minerals have specific chemical compositions, but rocks do not.
C. Crystals are a type of rock and granite is a type of mineral.
D. Minerals are made of rocks combined in different combinations.
Answer:
B.
Explanation:
Minerals are formed due to chemical composition by rocks are pressured into their formed from dirt and naturally hard things.
The statement that represents a distinguishing difference between rocks and minerals is as follows:
Minerals have specific chemical compositions, but rocks do not.Thus, the correct option for this question is B.
What is the difference between rocks and minerals?A mineral is a naturally occurring substance with distinctive chemical and physical properties, composition, and atomic structure. Rocks are generally made up of two or more minerals, mixed up through geological processes.
Minerals are definitely formed due to chemical composition by rocks being pressured into their formation from dirt and naturally hard things. A rock is an inorganic and a solid naturally-formed substance without any chemical composition or atomic structure.
A mineral is also a solid, inorganic, substance as that like a rock which has a definite crystalline structure as well as chemical composition. Rocks form, break down and move through the rock cycle.
Therefore, the correct option for this question is B.
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Tammy spent of her savings on a watch. She then spent-of
the remainder on a
.
5
bag. What fraction of her money did she have left?
Answer:
1 / 2 of her money would be left
Explanation:
Tammy spent 2/5 of her savings on a watch. She then spent 1/6 of the remainder on a bag. What fraction of her money did she have left?
Taking the question bits by bit;
Tammy spent 2/5 of her savings on a watch
Amount Spent = 2/5
Remainder = 1 - 2/5 = 3/5
She then spent 1/6 of the remainder on a bag
Amount Spent = 1/6 * 3/5 = 1/2 * 1/5 = 1 /10
Total amount spent = 2/5 + 1 /10 = (4 + 1 ) / 10 = 5 / 10 = 1 / 2
Amount left = 1 - 1 /2 = 1 / 2