Answer:
Explanation:
Chemists categorize chemical changes into three main classes: inorganic chemical changes, organic chemical changes, and biochemical changes.
Burning of paper and log of wood.
Digestion of food.
Boiling an egg.
Chemical battery usage.
Electroplating a metal.
Baking a cake.
Milk going sour.
Various metabolic reactions that take place in the cells.
Potassium is a silvery-white, solid metal. Chlorine is a greenish-yellow gas. When these two elements react chemically, they yield potassium chloride which is an odorless salt with a crystal structure. Potassium chloride is used in the production of fertilizer.
Required:
Which part of atomic structure is responsible for the reactivity of atoms?
The electrons present in the valence shell of an atom are responsible for the reactivity of atoms.
What is an atom?An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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look at the chemicals listed below and answer the questions . iron
water
sand
oxygen
gold
carbon dioxide
helium
carbon
rust
seawater
1. Name the two metals
2.Name a gas that is not an element
3.Name a mixture
4.Name a non metallic element that is a solid .
Answer:
1. gold and rust
2. carbon dioxide
3. sea water
4. carbon
Answer:
1. Gold and Iron
2. Helium
3. Seawater
4.Rust
Explanation:
What is the purpose of an indicator in a titration.
Answer:
The role of indicator in titration is to detect the endpoint of the titration. When the colour of the solution changes, it indicates that the concentration of the chemical specie has reached a critical range. This change in colour is possible with the help of indicators.
Explanation:
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#carry on learning and keep safe
correct me if I'm wrong and if correct brainliest me please
Elements that become cations during bonding become smaller as a result.
A.
True
B.
False
During an investigation, a student mixes two liquids in a beaker. The student recorded the following observations in her science notebook.
I. Both liquids are clear prior to mixing.
II. Both liquids are room temperature prior to mixing.
III. The liquid turned pink when mixed.
IV. The temperature of the liquid increased.
V. Over time, a white solid formed at the bottom of the beaker.
Required:
What are evidence of a chemical reaction?
Answer:
3, why because most of the time chemicals reacts within eachother to make new compound that's may lead the liquid chemicals to deflect some of the spectrom of light like red,yellow,blue
To solve such this we must know the concept of chemical reaction. There are so many ways to identify the chemical reaction. Therefore the correct options are option 3, 5.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved that is mass can nether be created nor be destroyed in a chemical reaction.
There are so many types of chemical reaction reaction like combination reaction, double displacement reaction. The evidence of a chemical reaction are "the liquid turned pink when mixed" and "over time, a white solid formed at the bottom of the beaker".
Therefore the correct options are option 3, 5.
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"It is not the union that organizes the employees; it is management."
The statement "it is not the union that organizes the employees; it is management " means that :
The management creates the climate which allows the union to convince employees to accept union representation.This excerpt shows that although the union helps in the organization of employees for better and easy management of staffs by the management, the management creates an enabling environment by creating stipulations which allows the u ions to convince staffs to join and accept union representation in staff welfare matters.
Hence we can conclude that, the management creates the climate which allows the union to convince employees to accept union representation.
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Can anyone help me? I will try to give brainliest.
Answer:
Looking at the table, Silver is definitely the most conductible metal there. It has the lowest electrical resistivity which means it allows for an easier flow of electrons, and it also has a higher thermal conductivity which means it would exhibit a higher conductivity. Diamond has the highest thermal conductivity, but the electrical resistivity is extremely high and due to its giant covalent/tetrahedral molecular structure (being an allotrope of Carbon), electrons can't necessarily jump around. Diamond wouldn't be a conductor at all.
The most simplest composition and structures provide a higher thermal conductivity. For example, with Diamond, we know that it is a structure made of covalent bonds of carbon, so its thermal conductivity is high.
Answer:
Q1
Copper
Explanation:
Copper is a good conductor of electricity, its resistance is high, and its chemical activity is weak
Q2
The thermal conductivity of a specific material is highly dependent on a number of factors. These include the temperature gradient, the properties of the material, and the path length that the heat follows.
PLEASE help in the middle of a test: When table salt forms, which action occurs between the reacting elements?(1 point)
Answer:
don't know if this is what your looking for but it might be a NEUTRILIZATION REACTION.
Answer:
i think its sodium donates an electron to chlorine
Explanation:
Which of these questions can be answered using science?
What is the best career?
Does water exist on Venus?
Should the use of automobiles be stopped?
Which is the most interesting subject to study?
Answer:
B. Does water exist on Venus?
Explanation:
The first question, " which is the best career " isn't answered by science since it's subjective. different individuals will have different views, but I believe, whatever field a particular person like is the best field career. The third question is a " computer and technology " related question along with It being subjective while the forth
the question, just like the up to two questions, it's also subjective but the second question is in fact understandable by science.
Answer:
Does water exist on Venus?
Explanation:
This answer would be answered using science because venus is another planet and we don't have access to it, the only way we would know would be if scientists traveled there and explored it.
I need help ASAP my final 20 points!!!
Pls help if you only know the correct answer! Thanks! :)
Answer:
i think itd be an exothermic reaction
Explanation:
An exothermic process releases heat, causing the temperature of the immediate surroundings to rise.
what are two possible ways to show the structure of ch4?
Answer: Two possible ways to show the structure of CH4 are its electron dot diagram or structural formula. CH4 or methane's molecular formula is given as CH4. The structural formula is a graphical representation of a chemical compound.
Answer:
using electron dot diagrams or structional formula
2. Is the following sentence true or false? Most earthquakes generate
tsunamis.
Which type of reaction is
NaOH + KNO3 NaNO3 + KOH
-->>
Answer:
Explanation:
NaOH + KNO3 --> NaNO3 + KOH. combustion. CH4 + 2 O2 --> CO2 + 2 H2O. single displacement. 2 Fe + 6 NaBr --> 2 FeBr3 + 6 Na. double displacement.
-
Which image shows in nonrenewable resource?
Answer:
1
Explanatio
right on edge
Among the given images, the one which is an example of non-renewable source of energy is image -1 the cooking gas is a petroleum product and it is non-renewable.
What are non-renewable energy sources?Non-renewable energy sources are sources of energy that come from finite resources that cannot be replenished on a human timescale. They are called non-renewable because their reserves are being depleted faster than they can be replenished. These energy sources include:
Fossil fuels: Coal, oil, and natural gas are the three main types of fossil fuels. They are formed over millions of years from the remains of plants and animals that lived long ago. Fossil fuels are currently the most widely used sources of energy for electricity generation, transportation, and industrial processes.
Nuclear energy: Nuclear energy is produced through the process of nuclear fission, which involves splitting atoms of uranium or plutonium to release energy. Nuclear power plants generate electricity using this process.
Non-renewable energy sources are a major contributor to greenhouse gas emissions, which contribute to climate change. As a result, there is a growing need to transition to renewable energy sources that are sustainable and have a lower environmental impact.
Here, image 1 - cooking gas is non-renewable.
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Would an alkaline earth metal make a good replacement for tin in a tin can?
Answer:
Definitely not. This is because the alkaline earth metal [basically group 2 elements] are reactive and will react with the contents of the can, contaminating it.
No, alkaline earth metals would not be a good replacement for tin in a tin can because alkali from alkaline earth metals react with tin and release hydrogen.
What are alkaline earth metals?Alkaline earth metals are present in group 2 of the periodic table. They are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).
They are called alkaline earth metals because their hydroxide and oxides are highly alkaline. Their metal oxides are found in the earth's crust.
These metals have 2 electrons in their outer shell, and they are highly reactive, so they will react with the tin in a tin can.
Thus, alkali from alkaline earth metals react with tin and generate hydrogen, hence they would not make an acceptable replacement for tin in a tin can.
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Methane has the chemical formula of CH4 and would, therefore, it would be
considered...
Answer:
compound
Explanation:
A compound contains more than one element.
Methane's chemical formula (CH4) indicates that it consists of one carbon atom and four hydrogen atoms.
Therefore, methane is a compound.
If a sample of air in a school container was heated, would the percentage of oxygen in the air increase, decrease, or remain unchanged?
Answer:
increase
Explanation:
Let's suppose we have a sample of air in a closed container. We heat the container and we want to predict what would happen to the pressure.
According to Gay-Lussac's law, the pressure of a gas is directly proportional to its absolute temperature.
Thus, if we increased the temperature of the air by heating it, its pressure would increase.
If a sample of air in a closed container was heated, the total pressure of the air would increase.
what is the number of the atom in 1 mole of methanol CHɜOH ?
why do i have white spots on my teeth after brushing?
as the atoms of the elements from atomic number 3 to 9 are considered in sequence from left to right on the periodic table, the atomic radius of each successive atom is
Answer:
decreasing
Explanation:
from left to right the nuclear effective charge is increasing, attracting with a greater force the electrons and making the atom to reduces itd atomic radius
The atomic radius decreases along a period in periodic table. Thus, from the third element Li to the 9th element fluorine, atomic radius decreases and F has the lowest radius among them.
What is atomic radius?Atomic radius is the distance from the nucleus to the valence shell. The atomic radius decreases from left to right in periodic table. Thus, the higher atomic radius is exhibited by metallic elements.
The horizontal rows in the periodic table is called periods. Along a period , atomic radius decreases and electronegativity increases. When moving to the right there is no increase in the number of shells and the filling of electrons does not achieve octet except for group 18. Hence, they are electronegative.
From atomic number 3 to 9 atomic number is decreasing. Hence, among these elements, the smallest one is fluorine (Z = 9).
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Would you expect the shielding effect to be greater in bromine than in chlorine?
A. Yes, because there are more filled orbitals in bromine.
B. Yes, because bromine has a higher atomic number.
C. No, because they are both in the same family.
D. No, because chlorine has a higher electronegativity than bromine.
The shielding effect of bromine is greater than chlorine because there are more filled orbitals than in chlorine.
Shielding EffectThis is the process where by electrons are protected by the pull attraction of the nucleus with the use of electron shells. The shielding effect increases down the group of the periodic table and increases across the period. This is because when you move down the group, there's an increase in the number of shell by 1 and it helps to reduce the effect of nuclear attraction on the electrons. However when you move across the period, there's an increase in the numbers of electron with the same shielding electrons from group 1(a) across the period to group 7(a).
Factor that affect the shielding effect of an electronThe numbers of electrons on the inner shells.Type of orbital which the electron is located.Shielding effect is primarily dependent on the numbers of electrons in the inner shells as well as the type orbitals.
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Alkaline batteries adopted their name from the _____ that is present in the reactions at both the zinc anode and the MnO2 cathode.
Answer:
hydroxide ion
Explanation:
The alkaline battery got this name because it has an alkaline electrolyte of potassium hydroxide.
when an electron is acquired by a neutral atom, the energy change is called
Answer:
when an electron is acquired by a neutron atom, the energy change is called its electron affinity
When an electron is added to a neutral atom to create a negative ion, the energy of the atom changes (in kJ/mole). This is how electron affinity is defined. Alternatively put, the possibility of the neutral atom receiving an electron.
What is electron affinity ?The amount of energy released when an electron binds to a neutral atom or molecule in the gaseous state to produce an anion is known as the electron affinity of an atom or molecule.
Although there is a slight distinction between the two, electron gain enthalpy is occasionally also referred to as electron affinity. The amount of energy released when an electron is added to a single gaseous atom is known as the electron gain enthalpy.
The amount of energy released when an atom receives an additional electron is known as its electron affinity. The gaseous state is when electron affinities are measured. On the periodic table, electron affinities tend to shift from negative to positive as we move from left to right.
Thus, when an electron is acquired by a neutral atom, the energy change is called as electron affinity.
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2. What problem did astronaut Eugene Cernan encounter while on an EVA? How did it relate to
Newton's third law of motion?
Answer:
Well he couldn't be pushed back as there isn't a place for him to float back, because of Newton's third law: Every force has an opposite force when Eugene pushes, he will float backwards
Explanation:
Hope this helps!
B. Number the digestive process in the correct sequence. Write A-E on the blank 21. Food moves into the small intestine. 22. Food is stored and further broken down by acid and powerful enzymes 23. Your saliva helps break down what you're eating and turn it into chemicals called enzymes. 24..Food moves through your esophagus. 25. Anything left in the small intestine moves into the large intestine
Answer:
21. D (Food moves into the small intestine.)
22. C (Food is stored and further broken down by acid and powerful enzymes.)
23. A (Your saliva helps break down what you're eating and turn it into chemicals called enzymes.)
24. B (...Food moves through your esophagus.)
25. E (Anything left in the small intestine moves into the large intestine.)
Explanation:
Food first enters the mouth where it is chewed and broken down by salivary amylase. Then, it is swallowed, moving down the esophagus to the stomach where it is stored and further broken down by acids and enzymes. And, these broken down food molecules moves into the large intestine.
5.20763 to three significant figures
Answer:
5.21
Explanation: You can only have 3 digits, so you would round to the hundredths place
why don't elements in a group have consicutive atomic numbers?
Answer:
Periods have consecutive atomic number as they are in a row and groups are vertical meaning they are in a column and groups have similar properties
How are elements arranged on the periodic table?
Question 10 options:
boiling point
atomic mass (# of protons and neutrons)
density
atomic number (# of proton
Answer: They are arranged by atomic number.
What are some examples of a physical change? (list more than 2 examples)
Answer:
Examples of physical change include changes in the size or shape of matter. Changes of state, for example, from solid to liquid or from liquid to gas, are also physical changes. Some of the processes that cause physical changes include cutting, bending, dissolving, freezing, boiling, and melting.
Explanation:
I hope this helps