Answer:
El Niño refers to the above-average sea-surface temperatures that periodically develop across the east-central equatorial Pacific. It represents the warm phase of the ENSO cycle. La Niña refers to the periodic cooling of sea-surface temperatures across the east-central equatorial Pacific.
Which has kinetic energy?
Ob
a tank of gasoline
a moving car
a battery
Ос
Od
water in a reservoir
Answer:
a moving car
Explanation:
because The faster an object is moving, the more kinetic energy it has. Any object that is moving has kinetic energy – the moving object has energy because of its motion.
3. Gold-198 decays with a half-life of 2.7 days according to the equation:198Au → 0−1β + 198Cd
a. Find the value of the rate constant, k. Include units.
b. How much of a 10.0 g sample of Au-198 remains after seven days? (Use the integrated rate law formula.)
a. k=0.256/day
b.sample of Au-198 remains after seven days : 1.67 g
Further explanation1. A half-life of 2.7 days⇒t1/2=2.7 days
The half-life can be expressed in a decay constant( λ)
[tex]\tt \displaystyle t_ {1/2} = {\dfrac {\ln (2)} {\lambda}}\\\\\lambda(or~k)=\dfrac{0.693}{2.7}=0.256/day[/tex]
2. We can use formula : (integrated rate law) :
[tex]\tt ln[A]=-kt+ln[Ao]\\\\ln(\dfrac{Ao}{A})=kt[/tex]
Ao=10 g
t=7 days
k=0.256/day
[tex]\tt ln(\dfrac{10}{A})=0.256\times 7\\\\ln(\dfrac{10}{A})=1.792\\\\e^{1.792}=\dfrac{10}{A}\\\\6=\dfrac{10}{A}\rightarrow A=1.67~g[/tex]
The mass of Au-198 that remains after seven days is 1.62 g.
We know that radioactive decay is a first order reaction hence;
k = 0.693/ t12
Where;
k = rate constant
t12 = half life
k = 0.693/ 2.7 days = 0.26 day-1
Using;
N =Noe^-kt
No = amount of radioactive material initially present
N = mass of radioactive substance present at time t
N = 10 e^-(0.26 × 7)
N = 1.62 g
The mass of Au-198 that remains after seven days is 1.62 g.
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Question 5 of 5
The Monroe Doctrine changed the United States' role in the world by:
O A. allowing the country to control a huge number of colonies around
the world.
O B. increasing the country's power to influence political decisions in
Europe.
C. giving the country a larger role in protecting other countries in the
Americas.
D. forcing the country to use its military to support all democratic
revolutions.
Answer:It is C i got it correct
Explanation:
Answer:
C. giving the country a larger role in protecting other countries in the
Americas.
Explanation:
Fe (s) + Pb(NO3), (aq) —> ___
Type of reaction: _____
Answer:
lead , chemical
Explanation:
The work done by effort is called
Answer:
load
Explanation:
the load is the work done by the effort on the machine
What is the largest limiting factor that keeps us
from traveling far away from Earth in space?
Use the drop-down menus to select the sentences that show precise use of pronouns.
1. Fred visited Nick after his graduation.
2. After Nick's graduation, Fred visited him.
1. Marie told Sarah that she makes great spaghetti.
2. Marie told Sarah, "You make great spaghetti."
1. John broke the fence with his bike.
2. John's bike hit a fence and it broke.
Answers
Sentence 1
Sentence2
Answer:
sentence 2, sentence 2, sentence 1
Explanation:
it was right for me on edge 2020
Answer:
1. Fred visited Nick after his graduation.
2. After Nick's graduation, Fred visited him.
1. Marie told Sarah that she makes great spaghetti.
2. Marie told Sarah, "You make great spaghetti."
1. John broke the fence with his bike.
2. John's bike hit a fence and it broke.
Plz answer as soon as possible!!
Question: what is a shared pair of electrons? What is an unshared pair?
Answer:
Explanation:
shared pair of electrons= covalent bond (sharing of electrons allows atoms to complete octet and gain stability)
unshared pair of electrons= lone pair/ non-bonding pairs
What is necessary to produce visible light from chemical compounds?
Answer:
the molecule must contain either pi bonds or atoms with non-bonding orbitals.
Explanation:
A non-bonding orbital is a lone pair on, say, oxygen, nitrogen or a halogen.
An atom of a certain element has 12 protons, 14 neutrons, and 2 valence electrons. What is the name of this element?
Given :
An atom of a certain element has 12 protons, 14 neutrons, and 2 valence electrons.
To Find :
The name of this element.
Solution :
We know, element with atomic number ( number of protons ) 12 and valance electrons is Magnesium.
Now, isotope of magnesium of proton with 14 neutrons is Mg-16 .
Therefore, name of element is Mg-16 .
Hence, this is the required solution.
Thanksgiving is November 26th. Today is November 9th. How many seconds are there until Thanksgiving Day?
Potato strips placed in a container of concentrated salt water will ultimately __.
What is the smallest unit of cellular organization?
Answer:
A cell
Explanation:
When vinegar and baking soda react, the mixture becomes cold to the touch and a gas and a new liquid substance are formed. Which best describes what is occurring in the reaction? The reaction is chemical and endothermic. The reaction is chemical and exothermic. The reaction is non-chemical and endothermic. The reaction is non-chemical and exothermic.
Answer:
A
Explanation:
The mentioned reaction between vinegar and baking soda is a type of chemical reaction and endothermic reaction as the reaction proceeds with absorption of energy which turns the mixture cold.
What is endothermic reaction?An endothermic reaction is defined as a chemical reaction which is a thermodynamic process accompanied by an increase in enthalpy of the system.In this process, a system absorbs energy from the surroundings which is mainly thermal energy.
Thus an endothermic reaction leads to an increase in the temperature of the system with a decrease in the temperature of the surroundings.Endothermic reactions usually involve the formation of bonds which requires input of energy.In endothermic reactions, entropy of the surrounding decreases.
Many endothermic processes involve the physical changes rather the chemical changes.In an endothermic reaction ,the potential energy of products is greater than that of reactants.
Learn more about endothermic reaction,here:
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someone help me please i’ll give brainly
[tex]\huge\boxed{Sublimation}[/tex]
_____________________________________Sublimation:Sublimation is a process in which the solid molecules gain energy from their surrounding and they now have enough energy to overcome the force of attraction with the neighboring molecules, thus they escape into the surrounding without going through the liquid phase, that means they directly jump to the vapor phase.
_____________________________________EndothermicThose process which absorb energy from their surrounding to form the product are called endothermic process. Since the SUBLIMATION requires additional energy, it is an endothermic change.
_____________________________________Best Regards,'Borz'What data do scientists use to determine when a volcano might erupt?
Whoever gives me the right answer will get brainliest.
Answer:
seismographs
Explanation:
Scientists use seismographs that record the length and strength of each earthquake to try to determine if an eruption is imminent. Magma and gas can push the volcano's slope upward.
Which of the following diagrams correctly represents the formation of a compound consisting of magnesium and fluorine?
Answer:
See explanation
Explanation:
The image attached describes the formation of magnesium fluoride.
Magnesium has two valence electrons while fluorine has seven valence electrons. Magnesium can now transfer one electron each to two fluorine atoms thereby forming the compound MgF2.
This has been shown pictorially in the image attached to this answer.
I WILL GIVE BRANLIEST HELP HELP HELP THE SUBJECT IS ACTUALLY SCIENCE What factor is a mushroom in an ecosystem? Abiotic or Biotic?
Answer: The answer is biotic
Explanation:Mushrooms are biotic because they are living things. Abiotic means non living, so these are factors in the environment that influence a living thing's life and chance of survival
Answer: jdusjzj bacteria germs
Explanation:
Students in a chemistry lab used sodium hydroxide to neutralize the carbonic acid in two different sodas, coke and sprite. More base was required to neutralize the sprite than the coke. What does this tell you about the acidity of sprite as compared to coke?
A: Coke is more acidic than sprite
B: Sprite is more acidic than coke
C: Coke and Sprite are equally acidic
D: There is not enough information to determine
Please help me It would mean everything!!
1. high
You are correct.
Cold region have more air pressure because air is denser.
12 Ethene gas, CH is completely burned in excess oxygen to form carbon dioxide and water
The equation for this exothermic reaction is shown.
CH 30, - 200, 2H,0
The table shows the bond energies involved in the reaction
bond
bond energy
(kJ/moly
614
413
C-C
CHH
0 0
СО
495
799
O-H
467
What is the total energy change in this reaction?
A-954 kJ/mol
B-1010 kJ/mol
C-1313 kJ/mol
D-1359 kJ/mol
Answer:
12 Ethene gas, CH is completely burned in excess oxygen to form carbon dioxide and water
The equation for this exothermic reaction is shown.
CH 30, - 200, 2H,0
The table shows the bond energies involved in the reaction
bond
bond energy
(kJ/moly
614
413
C-C
CHH
0 0
СО
495
799
O-H
467
What is the total energy change in this reaction?
A-954 kJ/mol
B-1010 kJ/mol
C-1313 kJ/mol
D-1359 kJ/mol
Explanation:
thats all you said
Design criteria are the desired features of a design. Identify at least two criteria for the design of the ammonia-making process. Explain why these criteria are important.
Answer:
The ammonia production design process has two design requirements;
Sustainable renewable energy production of hydrogen. Sustainable use of another thermal ammonia-water process to retrieve ammonia throughout the wastewater.Explanation:
In the following process, ammonia is provided by natural gas:
[tex]H_2 + RSH \to RH + H_2S\\\\H_2S + ZnO \to ZnS + H_2O \ \ (Waste \ water)\\\\CH_4 + H_2O \to CO + 3H_2\\\\CO + H_2O \to CO_2 + H_2\\\\[/tex]
Ammonia would then be generated in a process called also as Haber-Bosch process by responding to produced hydrogen to nitrogen throughout the presence of catalysts.
[tex]3H_2 + N_2 \to 2NH_3[/tex]
Answer:
Sustainable renewable energy production of hydrogen.
Sustainable use of another thermal ammonia-water process to retrieve ammonia throughout the wastewater.
Explanation:
10 divided by 2 im confused
if your serious about this question then it is 5
paragraph on water cycle
Answer:
The water cycle or hydrologic is a continuous cycle where water evaporates, travels into the air and becomes part of a cloud, falls down to earth as precipitation, and then evaporates again. ... These areas are usually close to oceans or large bodies of water that allow more water to evaporate and form clouds.
Explanation:
The density of lead is 11.4g/cm3. What volume, in ft3, would be occupied by 10.0 g of lead?
Answer:
The volume is 3.09 ft^3.
Explanation:
The formula for volume is mass divided by density. 10.0 g / 11.4 g/cm^3 = 0.87719. Converted to cubis foot is 3.09 ft^3. I hope this helps you.
The insect population competes for _______________________ and nectar.
Answer:
eachother or different type of flower
Explanation:
Gamma rays are often used to kill microorganisms in food, in an attempt to make the food safer. Some people contend that this irradiated
food is actually less safe to eat. Which, if true, would most effectively dispute their idea? (1 point)
a
Irradiated food only emits alpha particles, which are harmless.
Ob
Irradiated food is shown to not be radioactive.
C
Irradiated food only contributes to background radiation.
Irradiated food has molecules that undergo transmutation,
Od
Answer:
b . Irradiated food is shown to not be radioactive.
Explanation:
If it can be proven that irradiated food is not radioactive, then it will effective dispute the idea that irradiated food are less safe to eat.
An irradiated food is one in which ionizing radiations have been employed to improve food quality. Thus, bacteria and other food spoilers can be exterminated from the food. Most irradiated food do not contain radiation and are fit for consumption.If it can be proven, that this is true, then it will challenge the idea that irradiated foods are not safe.
What are the coefficients for the following chemical reaction?
___Be(BrO3)2 --> ___BeBr2+___O2
A.
1, 1, 3
B.
2, 2, 6
C.
2, 2, 3
D.
2, 1, 2
1 points
QUESTION 12
The previous question is an example of what type of chemical equation?
A.
Synthesis
B.
Decomposition
C.
Single Re-Placement
D.
Double Re-Placement
Explanation:
A and D. the answer is a and d
what’s the answer please gelp
Answer:
Option A. 1.8×10²⁴ molecules.
Explanation:
Data obtained from the question include:
Number of mole of methane = 3 moles
Number of molecules of methane =?
From Avogadro's hypothesis, we understood that 1 mole of any substance contains 6.02×10²³ molecules.
Thus, 1 mole of methane equally contains 6.02×10²³ molecules.
With the above information in mind, we can obtain the number of molecules in 3 moles of methane as follow:
1 mole of methane contains 6.02×10²³ molecules.
Therefore, 3 moles of methane will contain = 3 × 6.02×10²³ = 1.8×10²⁴ molecules.
Thus, 3 moles of methane contains 1.8×10²⁴ molecules.
PLEASE HELP!!!!!!!!
Step 4: Create Lewis dot diagrams.
a) Draw Lewis dot diagrams of the reactants and products on the paper with your chemical equation.
b) Select a different color to use for each element in the chemical reaction. Use your chosen color
for the element’s symbol and for its valence electrons.
c) Label these diagrams “Lewis Dot Diagrams.”
Answer:
Hey student your question is not proper arrange, i don't understand what you want us to do