Answer:
Energy is released by the reaction
Explanation:
The statement which describes an exothermic reaction is that energy is released by the reaction.
What is an exothermic reaction?An exothermic reaction is defined as a chemical reaction which involves release of energy in the form of light,heat .In these reactions, energy is transferred from system to surroundings rather than taking energy from surroundings into system as in endothermic reactions.
In an exothermic reaction,change in enthalpy is negative.Therefore, it can be inferred that net amount of energy which is required to start the exothermic reaction is less than the net amount which is released by the reaction.
Examples of exothermic reactions are combustion reactions, detonation of nitroglycerin , neutralization reactions and nuclear fission.
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What is the coefficient for carbon dioxide (CO2) that completes and balances the equation below?
C6H12O6 + 6O2 à _?_ CO2 + 6H2O
1
2
6
12
How many orbitals does "p" have?
Answer:
three
Explanation:
Answer: 3
Explanation: The p sublevel has 3 orbitals, so can contain 6 electrons max. The d sublevel has 5 orbitals, so can contain 10 electrons max. And the 4 sublevel has 7 orbitals, so can contain 14 electrons max.
List the steps to write the shorthand electron configuration of argon.
Answer: 1s22s22p63s23p6.
Explanation:Therefore the Argon electron configuration will be 1s22s22p63s23p6. Because the third energy level has eight electrons and is therefore full (3s23p6) it is called a noble gas.
Julius went swimming at the lake. While he was playing on the shore, he found
a rock and a stick, and he threw them both in the lake. The rock sank to the
bottom, and the stick floated on top of the water. What must be true about the
stick and the rock?
Answer:
the rock is dencer than the water and the stick has more surface tension.
Answer:
The rock is heaver so it sinks to the bottom of the lake, and the and the stick is lighter so it floats.
Hope this helps☺️
(03.06 MC)
What is the strongest intermolecular force between an NaCl unit and an H2O molecule together in a solution? (4 points)
Group of answer choices
Covalent bonding
Dipole-dipole force
Hydrogen bonding
Ion-dipole force
Answer:
Hydrogen bonding
Explanation:
Its my answer
What is an energy sublevel?
A. The level of energy possessed by all electrons in one type of orbital
B. The energy required to gain electrons to form an octet
C. The energy contained within the nucleus of an atom
D. The amount of energy lost when 2 electrons are paired
Answer: A. The level of energy possessed by all electrons in one type of orbital. OR C. The energy contained within the nucleus of an atom.
Explanation: In chemistry, it would be A., but in physics, it would be C. It really depends on which subject in Science you’re doing. If you’re doing chemistry, choose A, if you’re doing physics, choose C.
An energy sublevel is A. The level of energy possessed by all electrons in one type of orbital.
What is an energy sublevel?An energy sublevel refers to the amount of energy that is possessed by all the electrons residing in an orbital. The energy sublevel can be ordered in the s, p, d, and f levels.
So, these are the orbitals described by the energy sublevel. The correct option number that describes the energy sublevel is then this; A. "The level of energy possessed by all electrons in one type of orbital."
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HI!! I need help, who has more energy red lights or radio waves?
Answer:
Red Lights
Explanation:
Which is a laboratory Thermometer made of?
Mercury or Alcohol
Answer:
Mercury
Explanation:
The old school laboratory thermometers were made from the liquid metal Mercury. It is a toxic element and must be handled with care.
Nowadays, we use digital thermometers, which are safer and provide a more accurate reading.
How many Pb and Kr atoms are there in Pb9(Al5Kr7)4?
can anyone help mwe? i needs help :(
Pb = 9
Kr = 28
Further explanationProust stated the Comparative Law that compounds are formed from elements with the same Mass Comparison so that the compound has a fixed composition of elements
In the same compound, although from different sources and formed by different processes, it will still have the same composition/comparison
Compounds can be formed from several elements, which can be the same or not .
The composition of the constituent elements is usually expressed in subscript
For compound : Pb₉(Al₅Kr₇)₄
The number of Pb atoms = 9
The number of Kr atoms = 7 x 4 = 28
Three out of 7 students at the dance were boys if 140 students attended the dance how many were girls enter number of girls here ___
what is the chemical formula for molybdenum(vi) sulfide
Answer: Mo2S6
Explanation: Only transition metals have Roman numerals. Metals first then nonmetals
Select all that apply.
Which valences have the greatest tendency to form ions?
+1
+2
+3
-4
+4
-2
-3
-1
Answer:
+1,-1,+2,-2,+3,-3
Explanation:
Some materials are phosphorescent, meaning that they can absorb light energy from the Sun, and then re-emit this energy later. Many objects people use today are phosphorescent, including glow-in-the-dark plastics. Some plastic objects have phosphorescent materials in them, which causes them to glow after they are exposed to light. In 1896, one year after x-rays were discovered, scientist Henri Becquerel hypothesized that uranium might work in this way as well. So he exposed a sample of uranium to sunlight, and then was pleased to discover that the uranium continued to emit energy even after it was taken out of the light. However, after several straight days of cloudy skies over his laboratory, Becquerel was shocked to discover that the energy kept coming from the uranium, even without sunlight. What had Becquerel accidentally discovered?
Answer:
Explanation:
After the Becquerel came to know the discovery of X-ray by Roentgen Becquerel began looking for a connection between the phosphorescence and the newly discovered X-rays. His thought was that phosphorescent uranium salts might absorb sunlight and reemit it as x rays.
To experiment this he exposed a sample of uranium to sunlight, and then was pleased to discover that the uranium continued to emit energy even after it was taken out of the light. However, after several straight days of cloudy skies over his laboratory, Becquerel was shocked to discover that the energy kept coming from the uranium,
He reported that the uranium salts emitted radiation without any stimulation from sunlight. He did further tests to confirm that sunlight was indeed unnecessary, that the uranium salts emitted the radiation on their own.
Initially he thought the effect was due to particularly long-lasting phosphorescence, but he soon discovered that non-phosphorescent uranium compounds exhibited the same effect. After that he announced that the element uranium was indeed what was emitting the radiation.
At first he also believed his rays were similar to x-rays, but his further experiments showed that unlike x-rays, which are neutral, his rays could be deflected by electric or magnetic fields which was against his expectations. Finally “Radioactivity” term was given to describe this new phenomenon.
This story of becquerel is well known example of accidental discovery.
Which mineral is found in both limestone and marble?
Answer:
Calcite
Explanation:
it is am mineral made up mostly of calcium carbonate
Answer:
Calcite is the answer your looking for.
Explanation:
Brainliest?
when the amount of energy increases, what happens to the frequency of that wave?
All of the statements below correctly describe eukaryotic cells. Some of the statements
also correctly describe prokaryotic cells. Which statement correctly defines a eukaryotic
cell, but not a prokaryotic cell?
Performs metabolic processes with the help of chemicals.
The flow of nutrients and wastes occurs across a membrane.
O Utilizes a nucleus to contain its DNA.
O Contains DNA as genetic material.
Hi! I am here to help so the answer is ,Utilizes a nucleus to contain its DNA!
Practice
What is the best definition of science? Choose the best answer.
Only learning through experimentation
Learning how the world works using evidence
8
Only looking at the world
A
9
Knowledge does not change - this knowledge has
been and is the same always
10
Aut
11
12
SUBMIT
13 P
Answer:
learning trough experimentation i think
Which two ideas about energy were lost when the caloric idea was abandoned?
Based on the trends you've identified, what generalizations can you make about how atoms gain or lose electrons?
Select all the correct answers.
1. Atoms with close to eight valence electrons tend to gain electrons when forming ions.
2. Atoms with only a few valence electrons tend to lose electrons when forming ions.
3. Atoms tend to gain or lose electrons such that they have eight valence electrons.
4. Atoms tend to gain or lose electrons in a way that results in the same electron configuration as a noble gas.
Answer:
All of them, see below
Explanation:
second pic
According to rule of octet, atoms gain or lose electrons so as to attain 8 electrons in valence shell. So atoms with fewer valence electrons will lose and atoms with valence electrons close to 8 will gain electrons. Thus, all the given statements are correct.
What is octet rule?Octet rule states that, atoms become stable when they achieve 8 electrons in their valence shell. As per this rule, atoms with fewer number of valence electrons or extra electrons are not stable.
Non-metals are all electron deficient. They contains valence electrons close to 8. Thus, they tends more to gain one or more electrons as per their valency to attain octet.
Similarly, metals are electron rich they contains one or two extra electrons in their valence shell and they easily lose these electrons to make the penultimate shell with 8 electrons being the the valence shell.
Noble gases in group 18 are stable since they are already having 8 valence electrons. Therefore, all the statements are correct regarding the lose/gain of electrons.
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Mr. Smith wanted to see if the color of light shined on a plant had an effect on the number of leaves it had. He gathered 2 groups of the same species of plants, gave them the same amount of water, and did the test for the same amount of time. On one group of plants he used white light. For the second group he changed the light color to red.
Answer:
This question is asking to identify the following variables in the question;
Independent variable: COLOR OF LIGHT
Dependent variable: NUMBER OF LEAVES OF THE PLANT.
Constant: SAME SPECIES OF PLANT, SAME AMOUNT OF WATER
Explanation:
Independent variable is the variable that is changed or manipulated by the experimenter in an experiment. In this experiment, the COLOR OF LIGHT is the independent variable because it is the variable that was changed
The dependent variable is the variable that is measured in an experiment or the variable that responds to the changes made to the independent variable. In this experiment, the dependent variable is the NUMBER OF LEAVES OF THE PLANT.
The constant is the variable that is kept unchanged by the experimenter throughout the experiment. In this case, the SAME SPECIES OF PLANT, SAME AMOUNT OF WATER are the constants.
Why does wood float in water and what is its density compared to water's 1.0 g/mL?
The density of wood <1 g/ml
Further explanationIf an object is put into the fluid, then there are 3 possibilities that will happen
1. floating 2. in the middle of the fluid 3. sinkFloating if the density of an object <the density of a liquid
In the middle of a fluid if the density of a liquid is the density of an object
Sink if the density of an object> the density of a liquid
Wood can float in water because it has a smaller density than water, so its density is <1 g / ml
At a constant temperature a tire has a pressure of 445 kPa and volume of 18.3 L. If the volume increases to 22.4 the new pressure of the tire will read ____kPa. Report your answer to the nearest whole number.
Answer:
P₂ = 364 KPa
Explanation:
Given data:
Initial pressure = 445 KPa
Initial volume = 18.3 L
Final volume = 22.4 L
Final pressure = ?
Solution:
The given problem will be solved through the Boly's law,
"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"
Mathematical expression:
P₁V₁ = P₂V₂
P₁ = Initial pressure
V₁ = initial volume
P₂ = final pressure
V₂ = final volume
Now we will put the values in formula,
P₁V₁ = P₂V₂
445 KPa × 18.3 L = P₂ × 22.4 L
P₂ = 8143.5 KPa.L/22.4 L
P₂ = 364 KPa
Are water molecules always polar or always non polar?
Answer:
hi
Explanation:
Water is a polar molecule. While the overall charge of the molecule is neutral, the orientation of the two positively charged hydrogens (+1 each) at one end and the negatively charged oxygen (-2) at the other end give it two poles.
Which group had the highest percentage of voter turnout for the 2008 election? A. advanced degree B. bachelor’s degree C. high school graduate D. less than 9th grade
Answer:
Republican
Explanation:
So sorry if im wrong but thus us what I remember studying
Please answer all and I will give you 50 points, you need to pick one for each
Answer:
1. 3
2. 2
3. 4
4. 1
Explanation:
13. Kelly is the dishes and decides to unfortunately wash her mother cast iron skillet by placing it in a sink full of water. After she's done washing it and leaves it to dry on the rack, she notices it's starting to turn weird colors. After first she thinks nothing of it until her mom calls her to the kitchen a day later as she's putting the dishes up. She is holding the iron skillet and she looks very upset. She shows Kelly how the iron has changed colors and tells her the skillet is ruined. What happened to the iron skillet considering if this is a physical or chemical property and which of the Metal VS Nonmetal properties has taken place?
Answer:
The skillet got rusted.
Explanation:
In the context, Kelly kept the iron skillet in the sink which is full of water. After washing the dishes, she noticed the skillet's color is starting to change. She kept it for dry on the rack but the day later the skillet was ruined and damaged.
It was a chemical and physical change in the property of the metal where the iron skillet which was kept in the sink full of water oxidized due to the water content and the iron got oxidized to form form iron oxide which is known as rust. It damages the utensil and the color changes to muddy red or brownish red.
Briefly explain in a few sentences the differences between how a sunflower gets energy and a squirrel gets energy. Include the words glucose, produces, and consumes in your answer.
Answer:
Explanation:
A sunflower, which is a plant, obtains its energy from the sunlight during a process called photosynthesis. This process uses the photons from the sunlight as energy to fixate CO₂ (which is in the air). This CO₂ is fixated and metabolized by the plant and produces glucose as the final product.
A squirrel, which is an animal, obtains its energy by the degradation of compounds found in the food (for example, a nut). Among other components, we can find carbohydrates, especially polymers formed by glucose monomers bound together. This polymer is first degraded by the saliva to monomers of glucose. This glucose is internalized and metabolized by the cells and after its lysis and passage through the Calvin cycle, it produces energy in the form of ATP and CO₂ as a final product (this process is called respiration).
What is the noble gas
configuration for Tungsten?
Answer:
[Xe] 6s² 4f¹⁴ 5d⁴
Explanation:
As new information is discovered, scientific theories are changed. Sometimes, old theories are revised. Why is this a necessary practice for science? Group of answer choices Old theories are dependent on primitive technology that was flawed, so new technology must be used. The process allows for an increasingly accurate understanding of the world It ensures that the newest ideas are the ones used to develop medicines and important safety equipment. New scientists need to get credit for their ideas or no one will go into science professions
Answer:
Old theories are dependent on primitive technology that was flawed, so new technology must be used.
Explanation:
The process of science is an unending process of inquiry into the nature of the universe. This inquiry into the nature of the universe is aimed at understanding of how things work and how the natural course of the universe can be exploited for man's good.
As new scientific evidences emerge, old theories are revised because we understand the world better, better technology is used to investigate nature in order to get a clearer view of natural phenomena.
Most old theories depend on obsolete technology, hence modern day sophisticated equipment must be used to correct the flaws of old theories.
How does the overall charge of oxygen-16
compare to the overall charge of oxygen-17 and oxygen-18? Use the
models of isotopes to help explain your answer
Answer:
there's a difference in neutrons in the neutron count
Explanation:
look at the diagram
The overall charge in both the isotopes is the same that is 0.
Explanation:
Isotopes are the atoms of the same element with the same number of protons and electrons but with different numbers of neutrons.In the isotope oxygen-17:
There are 8 protonsThere are 9 neutronsThere 8 electronsOverall charge on the oxygen-17:[tex]=+8+(-8)=0[/tex]
In the isotope oxygen-18:
There are 8 protonsThere are 10 neutronsThere 8 electronsOverall charge on the oxygen-18:[tex]=+8+(-8)=0[/tex]
The only difference in the given two isotopes is of number of neutrons
So from this, we concluded that the overall charge in both the isotopes is the same that is 0.
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