Answer:
A. Antoine Lavoisier
Explanation:
He is know for creating the first chemical textbook. This textbook included rules for naming different chemical compounds, which is the still the same method we use to this day.
Hoped this can help! :D
Answer:
a
Explanation:
What was the atomic theory about?
A) the existence of isotopes
B) the properties of the nucleus
C) the structure of the atom
D) the existence of electrons
Answer:
C
Explanation:
According to John Dalton's Atomic theory, it was about the structure of the atoms: "Each chemical element is composed of extremely small particles that are indivisible and cannot be seen by the naked eye, called atoms"
Answer:
C, the structure of the arom
Explanation:
It says it on google
Materials
Crayon
Table 2. Investigating crayons and candle when heated
Property before
heating
Property after heating
Answer:
1 - Crayon
Before heating is solid
After heating is liquid
2 - Candle
Before heating is solid
After heating is liquid
Explanation:
Crayon when heated become liquid at a temperature of 115 degrees Fahrenheit or above. When the temperature reached to 120 degrees Fahrenheit for crayon it melts down completely.
When Candle is heated it melts and liquid form of wax falls off which again becomes solid in second after reaching the floor. The melting point of candle is 130 degree Fahrenheit or above.
A potato cooks in a microwave oven. Microwaves are invisible waves that contain energy. How is heat being added to the potato?
Answer:
radiation
Explanation:
Microwave ovens are so quick and efficient because they channel heat energy directly to the molecules (tiny particles) inside food. Microwaves heat food like the sun heats your face—by radiation.
Answer:
The energy from the microwaves is absorbed by the potato.
Explanation:
Which of the following is an example of a chemical change?
A- The shell of an egg breaks when it is struck against a hard surface.
B- Chocolate squares are melted to make cake icing.
C- Flour and sugar are sifted together into a measuring cup.
D- A mixture of flour, sugar, eggs, and butter is baked to become a cake.
Answer:
D
Explanation:
It is D because once youve put together the ingredients and baked it you can not go in and taake out every ingredient and put it back to how it was before (Please also try to help me with my question it it about scaled copies, Please and thank you!)
Answer:
I believe the answer is B. Chocolate squares are melted to make cake icing.
Explanation:
What is true of gas?
Answer:
Gas is a state of matter that has no fixed shape and no fixed volume. Gases have lower density than other states of matter, such as solids and liquids. There is a great deal of empty space between particles, which have a lot of kinetic energy. ... The particles exert more force on the interior volume of the container
Explanation:
Answer:
Gas is a state of matter that has no fixed shape and no fixed volume. Gases have lower density than other states of matter, such as solids and liquids. There is a great deal of empty space between particles, which have a lot of kinetic energy. ... The particles exert more force on the interior volume of the container.
Explanation:
how does water get back into the atmosphere
Water gets back into the atmosphere because of the water cycle. The water cycle includes evaporation, precipitation and more. water from the ocean evaporates due to the sun and then precipatates as rain.
Noble gases are ________ because they have ______ outer shell electrons. A. very reactive, 1 B. inert, 8 C. inert, 0 D. very reactive, 8
Answer:
B
Explanation:
They don't react to other elements because their valence shell is already full.
Noble gases are inert because they have 8 outer shell electrons.
The correct answer is B) inert, 8
What is an electron quick answer?
An electron is a negatively charged subatomic particle. It is able to be either loose (no longer attached to any atom), or bound to the nucleus of an atom. Electrons in atoms exist in spherical shells of diverse radii, representing electricity ranges.
What number of electrons are in the outer shell?A maximum of the elements essential in biology want eight electrons in their outermost shell for you to be stable, and this rule of thumb is referred to as the octet rule.
Learn more about electrons here: https://brainly.com/question/16099437
#SPJ2
How many strips can you eat before you turn your skin pink? THIS IS KEEPING ME UP 24/7 ALL NIGHT!! HOW MANY!!!
Answer: ???? Chicken strips?
Explanation:None
Answer:
my input on this question is 69,420
Florida is the __________________ "capital" of the US?
Answer:
Orange
Explanation:
Answer:
tropical
Explanation:
tropical tropical
which property of matter changes during a chemical change but not during a physical change
Answer:In a physical change, atoms are not rearranged and the matter's physical and chemical properties are unchanged. Chemical changes, on the other hand, rearrange the atoms of matter in new combinations, resulting in matter with new physical and chemical properties.
Explanation:
easy
Which is the best metal to use in an alloy to increase its electrical conductivity?
Aluminum (Al)
Silver (Ag)
Zinc (Zn)
Antimony (Sb)
Answer:
[tex]{\huge{\pink{\underline{\underline{Question:}}}}}[/tex]
Which is the best metal to use in an alloy to increase its electrical conductivity?
[tex]{\huge{\pink{\underline{\underline{Answer:}}}}}[/tex]
Silver(Ag)..........
From the options The metal that would increase the electrical conductivity of an alloy is ; Silver ( Ag )
Silver ( Ag ) with an electrical conductivity of 6.3x10⁷ m/ohm is the best electrical conductor in its pure state. although aluminum and copper are good conductors of electricity. Silver been the best conductor should be the best metal to be used in an alloy to increase the electrical conductivity of the alloy.
Hence we can conclude that The metal that would increase the electrical conductivity of an alloy is ; Silver ( Ag
Learn more : https://brainly.com/question/24680545
A trainer wanted to train a dolphin to do a different trick every day and compare it with the trick on the original day to see how many tricks the dolphin
could learn to do.
Which of the following is a homogeneous mixture? a. Na(s) b. H2O(l) c. Cl2(g) d. NaCl(aq)
pls help
Answer:
H²0 is answer is H20 ok please
which of the following is a part of daltons atomic theory select all that apply
Answer:
Stewie Griffin
Explanation:
Scandium (II) Oxide
A. ScO2
B. Sc2O2
C. ScO
D. ScC2O4
19. Why should all measurements be done multiple times?
Answer:
Increasing precision with multiple measurements
Explanation:
The more measurements you take (provided there is no problem with the clock!), the better your estimate will be. Taking multiple measurements also allows you to better estimate the uncertainty in your measurements by checking how reproducible the measurements are.
Answer:
All measurements should be done twice to absolutely make sure that you have the correct measurement and to avoid any mistakes if you are like building lets say a table or doing a equation. The saying is measure twice cut once
Explanation:
Plz help!
How is gold an element? Explain.
Answer:
Gold is an extremely rare element on Earth. Because it doesn't react with very many other elements, it is often found in its native form in the Earth's crust or mixed with other metals like silver. ... Gold is also found in ocean water.
Explanation:
Imagine you have two beakers. Both beakers are filled with the same amount of water. The water in both beakers is the same temperature as well. You add 50 g of Substance A to the first beaker, and 50 g of Substance B to the second beaker. After stirring both beakers, there is a small pile of Substance A at the bottom of the first beaker. None of Substance B is visible in the second beaker. Which of the following statements is true? A. Substance A is less soluble in water than Substance B. B. Substance A is more soluble in water than Substance B. C. Substance A is not soluble in water. D. Substance B is not soluble in water.
Answer:
A.) Substance A is less soluble in water than Substance B.
Explanation:
Substance A is less soluble in water than Substance B.
What is Solubility?
This is defined as the ability of a substance, the solute, to form a solution with another substance, the solvent.
We were told that small particles were present in Substance A and none in Substance B which means all was dissolved which is why option A was chosen as the most appropriate choice.
Read more about Solubility here https://brainly.com/question/13620168
How can you remove energy from matter?
A By increasing its volume
B By lowering its temperature
C By increasing its pressure
D By boiling it
Answer:
you can remove energy from the matter by lowering its temperature
Lowering matter's temperature is an efficient way to take energy out of it.
B) By lowering its temperature is correct
What is energy?Energy is the quantifiable quality that is transferred to a body or a physical system and is noticeable in the performance of work as well as in the form of heat and light.
Energy is a conserved resource; according to the law of conservation of energy, energy can only change its form; it cannot be created or destroyed.
Primary energy sources come in a variety of forms, such as nuclear energy and fossil fuel energy.
Learn more about energy here:
https://brainly.com/question/13881533
#SPJ6
if the latitude is high does it mean it’s is hot or cold PLEASE HELP
Answer:
cold
Explanation:
cold is when it get high on lattitude
PLEASE HELP ASAP!
Read carefully and Fill in the blanks
Li = 1s^2 2s^1
Mg = 1s^2 2s^2 2p^6 3s^2
Br = 2s ^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^5
ASAP MULTIPLE CHOICE WILL MARK BRAINLIEST
An electrically neutral atom of beryllium has four protons.
Which statement is true?
There are four electrons.
There are four neutrons in the nucleus.
There is a charge of +4 on an atom of beryllium.
There is a charge of −4 on an atom of beryllium.
Answer:
There are four electrons
7. Crive reason :
a) CO₂ as
oxide
Mohs Scale of Mineral Hardness Hardness Mineral Absolute Hardness 1 Talc 1 2 Gypsum 2 3 Calcite 9 4 Fluorite 21 5 Apatite 48 7 Quartz 100 8 Topaz 200 According to the Moh's Scale of Mineral Hardness, the sample mineral that will scratch gypsum but not apatite is MOST LIKELY A) calcite. B) quartz. C) talc. D) topaz.
Answer: A) calcite
Explanation:
Hardness can be defined as the ability of the mineral to resist the scratch. It is the property to judge the hardness of the mineral. Mineralogist study this property of hardness using Mohs hardness scale.
Talc is the least hard substance after that gypsum, then calcite, fluorite, and then apatite.
The gypsum can be scratched by the calcite but the calcite cannot scratch apatite as it is softer than apatite.
Which material is the best conductor? Which material is the best insulator? Which material would enable you to warm your hands the fastest?
LDPE
HDPE
latex
Mylar
Neoprene
Answer:
Mylar
Explanation:
The metals are good conductors of electricity whereas plastics and wood are referred to as the insulators. Here all the given options are insulators. The best insulator is Mylar. The correct option is D.
What are conductors and insulators?The materials which allow electricity to flow through them is defined as the conductors whereas the substances which resist or do not allow the current to pass through them are called the insulators.
The human body is a best conductor and the conductor has free electrons on their surface. The insulators are solid in nature and they do not have free electrons at all.
The term Mylar is also called the plastic films. It is one of the most recognized and widely used polyester films. It is an excellent electrical insulator which can effectively trap heat.
Here LDPE is a poor conductor of electricity and HDPE is chemically inert. The latex and neoprene are forms of rubber which does not conduct electricity.
Thus the correct option is D.
To know more about conductors, visit;
https://brainly.com/question/28582532
#SPJ3
Scientists can identify an element by looking at the structure of a single A.molecule. B.electron. C.neutron. D.atom.
By definition, the correct answer is option D. Scientists can identify an element by looking at the structure of a single atom because the number of protons can be determined, and thus its identity.
All atoms are composed of a central nucleus in which there are particles with a positive electric charge, the protons, and neutron, which is an electrically neutral subatomic particle, around which other particles with a negative electric charge that are electrons move.
Thus, the atom is electrically neutral, since the positive charge of the protons is compensated by the negative charge of the electrons.
Atoms of different elements have different amounts of protons. The atomic number (which is identified by the letter Z) indicates the amount of protons that is present in the nucleus of an atom.
This number is then responsible for defining the electronic configuration of the atom and the chemical properties of the element. Then it is possible to say that the number of protons in the nucleus, that is to say the atomic number Z, of an atom determines its identity.
Finally, the correct answer is option D. Scientists can identify an element by looking at the structure of a single atom because the number of protons can be determined, and thus its identity.
Learn more:
https://brainly.com/question/5527493?referrer=searchResultshttps://brainly.com/question/24445381Which of these best describes the relationship between density and the rate of heat transfer?
A.) Heat transfers between objects regardless of density.
B.) The greater the difference in densities between objects, the slower the heat will transfer.
C.) The less dense the object, the faster the heat will transfer.
D.) The denser the object the faster the heat will transfer.
Answer:
C.) The less dense the object, the faster the heat will transfer.
Write down physical and chemical properties for rust, at least 4 each will give brainliest
Answer:
Physical properties; Gallium metal melts at 30⁰c
Chemical properties; Iron metal rusts
Which activity is the result of cell division at work
1. A bone breaks
2. A plant wilts
3. A wound heals
4. A meal is digested
when earth is closest to the sun, the northern hemisphere is in winter, why is this true?
Explanation:
Opposite hemispheres have opposite seasons, no matter the earth's rotation, because of the earth's tilt. The earth's tilt is responsible for all seasons.