Answer:
this my answer
Explanation:
Rutherford's gold foil experiment showed that the atom is mostly empty space with a tiny, dense, positively-charged nucleus. Based on these results, Rutherford proposed the nuclear model of the atom.Three fundamental laws of chemical combination
Answer:
the law of multiple proportions, law of definite proportions, and law of conservation of mass.
Explanation:
(Hope this helps can I pls have brainlist (crown)☺️)
Number 8 question need help
Answer:
where is the question
Explanation:
pls. send it
What is a paper clip, a colloid? solution? or a suspension?
Answer:
I'm gonna guess it's a suspension
Explanation:
let me know if I'm wrong
1. Cooking pots are provided with wooden or plastic handles .Why?
Answer:
So the heat doesn't transfer to the handle and heat it up causing you to burn yourself in cooking process
Explanation:
Hope this helps! Happy Halloween
Cooking pots are provided with wooden or plastic handles because wood or plastic handles are bad conductors of heat. Hence, the heat from the hot appliances does not flow to our hands with the result that we can handle them without any difficulty.
Question 4 (2 points)
(02.04 MC)
Jackson is making dinner and is trying to dissolve salt into a pot of water. The salt is dissolving slowly. What should Jackson do to speed up the
rate of dissolving? (2 points)
O.
Ob
Oc
He should put larger salt particles in the water.
He should hear the water to a higher temperature.
He should completely stop stirring the pot of water.
He should slow down the speed he is stirring the pot
Od
Question 5 (2 points)
(02.04 MC
ribed below
Answer:
B. He should heat the water to a higher temperature.
Explanation:
Tiny particles that make up water and salt vibrate at higher speeds in hotter temperatures, which mixes the salt and water faster. This causes salt to dissolve much faster.
cuales son los nombres de la distribución de los electrones en un átomo ?
Ryan and Abigail are conducting an experiment. They place six ice cubes into a beaker and find the combined mass. They allow the ice cubes to melt and find the combined mass of the beaker and the liquid water.
A
A
Before
After
What can the students expect to be true about the two masses?
The mass of the ice cubes will be greater because solids are more dense.
The mass of the ice cubes will be greater because they took up more space in the beaker.
The mass of the ice cubes and the water will be equal because the same amount of matter is in the beaker
The mass of the ice cubes and the water will be equal because their particles have the same amount of energy
B
c
С
D
The mass of the ice cubes and the water will be equal because the same amount of matter is in the beaker.
Matter is anything that has mass and occupy space. All substances are composed of matter. According to the law of conservation of mass, matter can neither be created nor destroyed but can be converted from one form to another.
Since mass is the quantity of matter in a substance, the mass of the ice cubes and the water will be equal because the same amount of matter is in the beaker.
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Block A is made of copper, which has a specific heat value of 0.385 J/g*C.
Block B is made of aluminum, which has a specific heat value of 0.900
J/g*C. Both blocks have a mass of 100 grams. If you are trying to heat the
blocks to a temperature of 200 C, which block will need to absorb more
energy?
o Block A (copper) because it has a lower specific heat value.
o Block B (aluminum) because it has a higher specific heat value.
o Block A (copper) because it has a higher specific heat value.
o Block B (aluminum) because it has a lower specific heat value.
Block B will need to absorb more energy as it has higher specific heat value.
What is specific heat?Specific heat is defined as the amount of heat required to raise the temperature of one gram of a substance by one degree Celsius rise. Units of specific heat are calories or joules per gram per degree Celsius.
Specific heat capacity varies with temperature often and is different for each state of matter. While the substance which undergoes phase transition then it's specific heat is technically infinite.
Specific heat of a gas is significantly higher when it is allowed to expand as it is heated .It may also be referred to as a ratio between the specific heat capacities of two substances at a given temperature.It is calculated by the formula ,Q=mcT
For copper, it is 100×0.385×473=18210.5 J
For aluminium ,it is 100×0.90×473=42570 J
As the specific heat of aluminium is higher it will absorb more energy.
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a molecule that carries information across a synaptic cleft is a
.
You should be able to
these groups on the periodic table, and know their
properties.
Answer:
The vertical columns on the periodic table are called groups or families because of their similar chemical behavior. All the members of a family of elements have the same number of valence electrons and similar chemical properties.
Explanation:
I HOPE NAKATULONG PO AKO:)PA BRAINLEST NLNG PO SANA:(A horse runs 1 km in 15 s. What is the average speed
The average speed of the horse for the entire motion is 66.67 m/s.
The given parameters;
distance traveled by the horse, d = 1 km = 1,000 mtime of motion of the horse, t = 15 sThe average speed of the horse is calculated by dividing the total distance traveled by the horse by the time of motion.
The average speed of the horse is calculated as follows;
[tex]average\ speed = \frac{distance}{time} \\\\average\ speed = \frac{1000 \ m}{15 \ s} = 66.67 \ m/s[/tex]
Thus, the average speed of the horse for the entire motion is 66.67 m/s.
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Your future is affected by your choices today? I agree or disagree
Answer:
The choice that we had decided on doing today factors our future because whatever choice we decide on doing in the present day can impact how our life will play out in the future. ... After all, it is your life, so whatever you chose to do, you have the power to decide and create what you think would be best for you
Explanation:
Which element is named after a scientist?
Aluminum is manufactured using electrolysis. Carbon electrodes are used. Describe the nature of the electrolyte.
At which electrode is the aluminum produced?
Answer:
The traditional electrolyte for aluminium electrolysis is based on molten cryolite (Na3AlF6), acting as solvent for the raw material, alumina (Al2O3).Metals are found in ores combined with other elements. Electrolysis can be used to extract a more reactive metal from the ore.
Aluminum can and is used as both anodes and cathodes in electrochemical cells, but there are some peculiarities to using it as an anode in aqueous solutions. As you note, aluminum forms a passivating oxide layer quite readily, even by exposure to atmosphere. In an aqueous solution, if the potential is high enough, OH− and O2− are generated at the anode, which can then react with the aluminum to produce aluminum oxide. Al^3+ can also be generated directly. The electric field will draw the anions through the growing aluminum oxide layer towards the aluminum surface and the Al^3+ towards the solution, making the oxide layer grow both away from the electrode surface and into the surface of the electrode. In this way, coatings thicker than the normal passivation in air can be produced. However, aluminum oxide is a good electrical insulator, thus if a dense non-porous layer is grown, it will become impossible to pass current through it and growth will stop, leaving a relatively thin oxide layer (this is how the dielectric layers in electrolytic capacitors are made). This is the normal behaviour in aqueous solutions at near-neutral pH (5–7).
However, if a thick aluminum oxide layer is desired (e.g. to produce coatings on aluminum parts for dying or durability), maintaining porosity is necessary to avoid completely blocking access to the surface. One technique that is commonly used is using a low pH solution, which tends to redissolve some of the oxide and neutralize some of the formed OH−, leaving pores in the oxide layer through which the ions can travel and continue to react. These pores also give a good structure to retain dyes or lubricants, but generally need to be sealed after to protect against corrosion.
Someone pls help me I will make you brain
Answer:
the second answer
Explanation:
Answer:
A Erosion of structures and buildings
Explanation:
Write down the names, physical properties, and inertness of NOBLE GASES ( group no. 8)
Note:
*Please don't copy from anywhere
*50 POINTS!!!!!!!!
Answer:
There's No Answer Im Sorry
1. Every summer Cheyanne drives to California. It is 3600 km to get there. If she spends 32 hours driving, what is her speed?
Answer:
Their speed = 69.9043 miles per hour
orTheir speed = 112.5 kilometers per hour
Explanation:
Which statement best explains the difference between polar and nonpolar covalent bonds?(1 point)
Polar covalent bonds give/take electrons, while nonpolar covalent bonds share electrons.
Polar covalent bonds share electrons equally, while nonpolar covalent bonds share electrons unequally.
Polar covalent bonds share electrons unequally, while nonpolar covalent bonds share electrons equally.
Polar covalent bonds share electrons, while nonpolar covalent bonds give/take electrons.
Covalent bonding can be defined as the sharing of electrons between two atoms.
The statement which best explains the difference between polar and nonpolar covalent bonds is "Polar covalent bonds share electrons unequally, while nonpolar covalent bonds share electrons equally"
We have:
Polar covalent bond is a chemical bond in which electrons are shared unequally or unevenly between two atoms. Non-polar covalent bond is a chemical bond in which electrons are shared evenly or equally between two atoms.Therefore, the statement which best explains the difference between polar and nonpolar covalent bonds is "Polar covalent bonds share electrons unequally, while nonpolar covalent bonds share electrons equally"
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answer pls asap!!!!!!
Answer:
im going to go with letter c
Explanation:
Answer:
Changes can occur to physical properties of a substance, but the chemical composition of the substance remains the same.
Explanation:
Physical change is a change in which there is no change in the chemical arrangement and thus there is no redistribution of atoms. No new substances are formed. There is only change in size, shape and phase etc.
[tex]H_2O(l)[/tex]→[tex]H_2O(g)[/tex]
Chemical change is a change in which there is change in the chemical arrangement and thus there is redistribution of atoms. which leads to formation of new substances.
[tex]2Na+Cl_2[/tex]→[tex]2NaCl[/tex]
Water, made of 1 oxygen atom bonded with 2 hydrogen atoms, is what
Answer:
It is a water molecule.
Explanation:
A water molecule consists of two atoms of hydrogen linked by covalent bonds to the same atom of oxygen. Atoms of oxygen are electronegative and attract the shared electrons in their covalent bonds.
Answer:
A water molecule is an example of a molecule created through covalent bonding. Water is made up of one oxygen atom and 2 hydrogen atoms, hence the chemical symbol H2O. A hydrogen atom is made up of 1 proton at its core and 1 electron that revolves around the core in a three-dimensional orbit.
Explanation:
how many atoms of neon are present in 1.30 moles of neon?
Answer:
7.83 x 10^23 atoms
Explanation:
what process in the natural world converts radiant energy into chemical energy?
Answer:
Photosynthesis
Explanation:
Photosynthesis is the process in which plants collect radiant energy (from the Sun) and transform it into chemical energy.
Answer:
Photosynthesis is the process in which plants collect radiant energy (from the Sun) and transform it into chemical energy.
Explanation:
BECAUSE I SAID, btw its right i promise
answer pls ASAP will mark the brainliest
For me that is the first :
Both the identity and the properties of a substance change.
Which of these statements is not true?
A. Atoms of the same element can have different masses
B. The nucleus of an atom has a positive charge
C. Atoms of isotopes of an element have different numbers of protons
D. Atoms are mostly empty space
Option 5
Answer:
c.
Explanation:
They can have different neutron numbers, not proton numbers. If they were to have different proton numbers it would be classified as a different element.
Each mineral group has a distinctive chemical feature such as
a. oxides are a metal combined with oxygen
b. sulfides are a metal combined with sulfur and oxygen
c. halides are a salt combined with a metallic atom
d. phosphates are made of phosphate polygons
Answer:
A
Explanation:
Electrons are transferred from one atom to another.
Options:
Ionic Bond or Covalent Bond?
Answer:
ionic
Explanation:
ionic transfer of e^- ions formed (charges)
ionic=non-metal+ metal
ex: F+Ca
covalent sharing e^- no true charges
covalent= non-metal+ non-metal
ex: F+P
( my notes)
any atom is most stable when it’s outermost energy level contains
Explanation:
Atoms are at their most stable when their outermost energy level is either empty of electrons or filled with electrons. Sodium atoms have 11 electrons. Two of these are in the lowest energy level, eight are in the second energy level and then one electron is in the third energy level.
Any atom is most stable when it’s outermost energy level contains eight electrons.
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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1. What atoms make up a molecule of Water?
2. What atoms make up a molecule of Carbon Dioxide?
I would appreciate it if this got answered and I will mark as brainliest, thank you.
Explanation:
Atoms join together to form molecules. A water molecule has three atoms: two hydrogen (H) atoms and one oxygen (O) atom
Carbon dioxide is a colorless and non-flammable gas at normal temperature and pressure. Although much less abundant than nitrogen and oxygen in Earth's atmosphere, carbon dioxide is an important constituent of our planet's air. A molecule of carbon dioxide (CO2) is made up of one carbon atom and two oxygen atoms.
I hope you got it..... ♥️
Answer:
1) 1Atoms join together to form molecules. A water molecule has three atoms: two hydrogen (H) atoms and one oxygen (O) atom. **
2) Although much less abundant than nitrogen and oxygen in Earth's atmosphere, carbon dioxide is an important constituent of our planet's air. A molecule of carbon dioxide (CO2) is made up of one carbon atom and two oxygen atoms. Carbon dioxide is an important greenhouse gas that helps to trap heat in our atmosphere. ^^
Which hybrid orbitals overlap to form the sigma bonds between the indicated atoms in xanthine?
Many nitrogen and carbon atoms can be found in the structure of a heterocyclic molecule called xanthine, which is present in many biological systems.
The development of a sigma bond between these atoms is an essential component of its binding. A special example is the sigma bond between the nitrogen atom and the neighboring carbon atom. In the context of this sigma bond, the hybridization state of nitrogen can be either [tex]\rm sp^2[/tex]or [tex]\rm sp^3[/tex], and the hybridization state of carbon can be [tex]\rm sp^3[/tex]. A sigma bond is formed when the hybrid orbitals of carbon and nitrogen, which are each [tex]\rm sp^2[/tex] hybridized and [tex]\rm sp^3[/tex] hybridized, overlap. A strong covalent bond can develop when the [tex]\rm sp^2[/tex] hybrid orbitals of nitrogen and carbon line up. This allows electron sharing.
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Cho 200 g dung dịch NaCl 0,5M tác dụng hết với 400 ml AgNO3. Sau phản ứng thu được kết tủa và dung dịch không màu
a, Viết phương trình hóa học xảy ra?
b, Tính khối lương kết tủa tạo thành
c, Tính nồng độ mol của dung dịch AgNO3 đã tham gia phản ứng.
Answer:
Explanation:
a. NaCl+ AgNO3-----> NaNO3+ AgCl
b. Số mol của NaCl= 0,2*0,5= 0,1 (mol)
------> Số mol của kết tủa AgCl tạo thành= 0,1 mol (dựa vào phương trình hóa học)
-----> Khối lượng của kết tủa AgCl tạo thành= 0,1*143,5=14,35(g)
c. Số mol của AgNO3= số mol của NaCl= 0,1 (mol)
------> Nồng độ mol của dd AgNO3 đã tham gia phản ứng= [tex]\frac{0,1}{0,4}[/tex]=0,25(M)
