Which statement best describes a chemical change?
O A. A substance changes size or phase.
O B. Atoms are made and destroyed.
O C. The nuclei of atoms are rearranged.
O D. Substances form new substances.
Answers
Related Questions
10/4/2021
the total number of protons and neutrons in the nucleus
of an atom
a) atomic mass unit
b) mass number
c) atomic number
d) atomic mass
Answers
Answer:
atomic number
Explanation:
the molecular formula mass of this compound is 150 amu . what are the subscripts in the actual molecular formula?
Answers
Answer:
You need the mass composition of the compound.
This composition works fine for the formula mass 150 amu.
C: 40.0%
H: 6.7%
O: 53.3%
From that, you can solve the problem following theses steps:
1) Convert mass composition fo molar ratios by dividing ech element by its atomic mass =>
C: 40.0 / 12 = 3.33
H: 6.70 / 1 = 6.70
O: 53.3 / 16 = 3.33
2) Divide all the numbers by the smallest one =>
C: 3.33 / 3.33 = 1
H: 6.70 / 3.33 = 2
O: 3.33 / 3.33 = 1
3) Write the empirial formula and calculate its mass:
C H2 O => 1 * 12.0 g/mol + 2 * 1.0 g/mol + 1 * 16.0 g/mol = 30 g/mol
4) Calculate how many times the empirical mass is contained in the molecular mass:
150 / 30 = 5
5) Conclusion:
The molecular formula is C5 H10 O5, i.e. the number of each atom in the molecular formula are:
C =5, H = 10, O = 5
Which of these objects has the properties of a solid?
A.
desk
B.
water
C.
rain
D.
milk
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who is generally called the father of modern chemistry
Answers
Explanation:
Antoine Lavoisier is the answer
Answer:
Antoine Lavoisier is the father of chemistry
Explanation:
Antoine-Laurent de Lavoisier, also Antoine Lavoisier after the French Revolution, was a French nobleman and chemist who was central to the 18th-century chemical revolution and who had a large influence on both the history of chemistry and the history of biology.
help pleaseeeee <333
Answers
Answer:
In Test 1 the person substantially did better and either had better knowledge of the subject or studied for it more then they did for Test 2.
Explanation:
If you have 10 tasks complete to finish a project‚ how many days will you need to spend working on this course if you spend five days on each task?
A.p.e.x l.e.a.r.n.i.n.g reading skills and strategies
Answers
Answer:
Well 50 of course
Explanation:
5 days per tasks is like saying 10 times 5 which is 50.
Cumulus Clouds are _______ ______ clouds with __________ bases.
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Answer:
Cumulus Clouds are __puffy _____ clouds with ___flat _______ bases.
List some things that help with heat generation. What do you use everyday that helps with heat generation?
Answers
Answer: A toaster
Explanation: A toaster is an house held item that is used for heating and toasting bread and other stuff.
The best way to get the sugar out of a sugar-water solution is to __________.
Answers
Answer:
Distillation is the process by which sugar can be separated from the sugar solution.
Explanation:
Distillation, or classical distillation, is the process of separating the components or substances from a liquid mixture by using selective boiling and condensation.
Answer:
Boil the water, this would cause the water to evaporate and will leave behind the sugar crystals, which is known as distillation.
Today, the atom is defined as the_____ particle that can still be considered an____.
Answers
Answer:
Today, the atom is defined as the smallest particle that can be considered an element.
Explanation:
Answer:
Today,the atom is defined as the smallest particle that can still be considered an element.
Help me pls I will mark you as brain
Answers
Which is the property of nonmetals to evaporate easily?
brittle
dense
liquid
volatile
Answers
Answer:
Volatile
Explanation:
Nonmetal are usually volatile, which means it evaporate easily.
--
Easy.
Answer:
Volatile
Explanation:
Nonmetals are usually volatile, so it means that they can evaporate easily.
If an atom has 4 protons and 2 electrons its charge will be:
Answers
Answer:
It's charge will be positive
Explanation:
4>2
the rays produced in a cathode tube are
Answers
Answer:
Electrons
Explanation:
Cathode rays carry electronic currents through the tube. Electrons were first discovered as the constituents of cathode rays. J.J. Thomson used the cathode ray tube to determine that atoms had small negatively charged particles inside of them, which he called “electrons.”
The rays produced in a cathode tube are electrons which are present in the shells surrounding the nucleus of an atom.
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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50 POINTS!!!!!!
Reactions that occur spontaneously must reach an energy threshold before they can proceed. The graph shows the amount of energy needed for a reaction to occur. Explain how enzymes are involved in this reaction and can affect the rate of this reaction.
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Explain what the force of Gravity on each planet depends on.
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Answer:
It depends on the size and mass of the object. Look at Jupiter. It has a higher gravitational pull because it has a higher mass
15). A covalent chemical bond is one in which A) electrons are removed from one atom and transferred to another atom so that the two atoms become oppositely charged. B) protons and neutrons are shared by two atoms so as to satisfy the requirements of both atoms. C) outer-shell electrons of two atoms are shared so as to satisfactorily fill the outer electron shells of both atoms. D) outer-shell electrons of one atom are transferred to the inner electron shells of another atom. E) the inner-shell electrons of one atom are transferred to the outer shell of another atom.
Answers
Answer:
B) protons and neutrons are shared by two atoms so as to satisfy the requirements of both atoms
distinguish between the crust and and the lithosphere
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Answer:
What is the difference between the crust and lithosphere? The crust (whether continental or oceanic) is the thin layer of distinctive chemical composition overlying the ultramafic upper mantle. ... The lithosphere is the rigid outer layer of the Earth required by plate tectonic theory.
Explanation:
An ionic bond would most likely form between elements of which two families on the Periodic Table?
Answers
Answer:
Ionic bonds can form between nonmetals and metals, while covalent bonds form when electrons are shared between two nonmetals.
Explanation:
An ionic bond is formed between the electropositive and electronegative bonds. In the periodic table, it is formed between s block and p block elements.
What are chemical bonds?There are different types of chemical bonds: Ionic bonds, covalent bonds, and coordinate bonds.
Ionic bonds, also known as electrovalent bonds, are a type of linkage created in a chemical molecule by the electrostatic attraction of ions with opposing charges. When the valence (outermost) electrons of one atom are permanently transferred to another atom, a bond of this kind is created.
It takes place in positively charged cation and negatively charged anion. This type of bond is seen in NaCl, CaCl2, and other molecules.
Metal and non-metal, ionic bonding form. Ionic bonds, as opposed to covalent ones, involve the transfer of valence electrons between atoms.
An ionic bond is formed between the electropositive and electronegative bonds. In the periodic table, it is formed between s block and p block elements.
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- ¿Qué otros materiales de tu entorno podrías utilizar que te permita mejorar tu filtrador de agua?
Answers
Suelo, grava, bolas de algodón, material de desecho, carbón, arena y astillas de madera.
El suelo, la grava, las bolas de algodón, los desechos, el carbón, la arena y las astillas de madera son materiales extraídos del medio ambiente que nos permiten mejorar la filtración del agua porque estos materiales filtran partículas y otras impurezas del agua y la hacen potable.
La arena y la grava se consideran buenos filtros de agua porque forman capas permeables que filtran el agua. El agua puede pasar lentamente a través de estas capas permeables y la mayoría de las partículas de suciedad quedan atrapadas, por lo que podemos concluir que los materiales anteriores se pueden utilizar como filtros de agua.
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Suppose it takes 5 minutes for half of your sample to radioactively decay. If you started with 80 atoms, and have only 5 radioactive atoms left, how many half-lives have occurred?
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which of these is chemical property
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What caused the water level in the pipe to change when you put the bottle in cold water
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Answer:
Water cooled down and contracted.
Explanation:
When water contracts, its volume decreases. When the volume of the water in the bottle system decreases, the water is pulled farther down the clear pipe.
An atom of oxygen (atomic number 8) has a mass number of 17. How many neutrons are
in that atom?
Answers
# of neutrons = mass number - atomic number
= 17 - 8
= 9
∴ number of neutrons in an atom of oxygen of mass number 17, is 9.A dump truck, a sports car, and a bicycle are traveling at the same velocity. Which is true?
A The bicycle has the least kinetic energy.
B More information is needed to compare their kinetic energy.
C They all have the same kinetic energy.
D The sports car has the most kinetic energy.
Answers
Answer:
a
Explanation:
The object with greater mass is having greater kinetic energy. Here, all the objects has the same velocity therefore, the bicycle is having least kinetic energy.
What is kinetic energy?Kinetic energy is a form of energy generated by virtue of the motion of the object. The kinetic energy is related to the mass and velocity of the body by the expression below:
KE = 1/2 mv².
As per this equation, kinetic energy increases with an increase in mass or/ and velocity. The substance with greater mass is possessing the greater kinetic energy.
A dump truck has greater mass than a car and bicycle. Thus, at the same velocity for all, the greater kinetic energy is for the truck and the least kinetic energy is for the bicycle having the least mass here. Thus, option A is true.
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please help!! will have a thanks and brainliest
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Answer:
A
Explanation:
I just did learned all about this
half of the earth is in the light and the other half is in the shadow because
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Answer:
the sun doesn't shine on that half
Explanation:
Witch zone contains plenty of sunlight for photosynthesis
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Answer:
well maybe it is open ocean (or the euphotic zone, witch is not an answer choice)
Explanation:
The top zone is the euphotic or sunlit zone. This is the ocean zone that sunlight penetrates. Because this zone gets sunlight, photosynthesis can occur and plants can grow here. The sunlit zone goes down to about 660 feet.
how many protons does boron-11 atom have
Answers
Answer:
5
Explanation:
A student was adding baking soda and vinegar in a bottle. They then put a balloon on top of the bottle immediately after adding them together. The student observed that the balloon inflated and got larger. The student then predicted that the chemical reaction between the vinegar and the baking soda had created brand new matter, and would have more mass at the end of the reaction. Would you agree with the student’s prediction or not? Explain your answer.
Whoever answers my question gets BRAINLIEST!!
Answers
Answer:
The prediction of the student about the amount of reactant and product is incorrect.
No, I do not agree with the student’s prediction because the amount of reactant is always equals to the amount of product. According to the Law of Conservation of Mass, mass cannot be created nor destroyed. Therefore in any chemical reaction the mass of the products must equal or same to the mass of the reactants so according to this law, the prediction of the student is incorrect.
Explanation:Give brailiest please
Answer:
The chemical reaction that occurs when vinegar and baking soda (sodium bicarbonate) are combined, creates a gas that is known as carbon dioxide (or CO2). I would agree with the student's prediction because the atoms rearrange themselves to create the product.
Explanation:
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