Answer:
In his 1805 work, "A New System of Chemical Philosophy," Dalton propounded the tenets of his atomic theory: The chemical elements are made of atoms. The atoms of an element are identical in mass. Atoms of different elements have different masses.
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An atom of sodium-23 (Na-23) has a net charge of
+1. Identify the number of protons, neutrons, and
electrons in the atom. Then, explain how you
determined the number of each type of particle.
Use the
periodic table to help you.
Answer:
Protons= 11
neutrons= 12
electrons = 10
Explanantion:
Look for Na on periodic table
Atomic Number = 11
Atomic Mass = 23 (round it to be an integer)
Number of protons = Atomic number = 11
Number of neutrons = Atomic mass - atomic number = 23-11 =12
Number of electrons = 11 - e = ´+1 , electrons = 10
Answer:
Protons= 11
neutrons= 12
electrons = 10
Explanation:
That should be the answer :)
The gas in an aerosol can is at a pressure of 3.10 atm at 25 degrees Celsius. Directions on the can warn the user not to keep the can in a place above 52 degrees Celsius. What would the gas pressure in the can be at 52 degrees Celsius
Answer:
[tex]\boxed {\boxed {\sf 6.4 \ atm}}[/tex]
Explanation:
We are asked to find the pressure of a gas in a can given a change in temperature. We will use Gay-Lussac's Law, which states the pressure of a gas is directly proportional to the temperature. The formula for this law is:
[tex]\frac {P_1}{T_1}= \frac {P_2}{T_2}[/tex]
Initially, the gas in the aerosol can has a pressure of 3.10 atmospheres at a temperature of 25 degrees Celsius.
[tex]\frac { 3.10 \ atm}{25 \textdegree C}=\frac{P_2}{T_2}[/tex]
The temperature is increased to 52 degrees Celsius, but the pressure is unknown.
[tex]\frac { 3.10 \ atm}{25 \textdegree C}=\frac{P_2}{52 \textdegree C}[/tex]
We are solving for the new pressure, so we must isolate the variable [tex]P_2[/tex]. It is being divided by 52 degrees Celsius. The inverse operation of division is multiplication, so we multiply both sides of the equation by 52 °C.
[tex]52 \textdegree C *\frac { 3.10 \ atm}{25 \textdegree C}=\frac{P_2}{52 \textdegree C} * 52 \textdegree C[/tex]
[tex]52 \textdegree C *\frac { 3.10 \ atm}{25 \textdegree C}=P_2[/tex]
The units of degrees Celsius cancel.
[tex]52 *\frac { 3.10 \ atm}{25}=P_2[/tex]
[tex]52 *0.124 \ atm = P_2[/tex]
[tex]6.448 \ atm = P_2[/tex]
The original values of pressure and temperature have 2 and 3 significant figures. Our answer must be rounded to the least number of sig figs, which is 2. For the number we calculated, that is the tenths place. The 4 in the hundredth place tells us to leave the 4 in the tenths place.
[tex]6.4 \ atm \approx P_2[/tex]
The gas pressure in the can at 52 degrees Celsius is approximately 6.4 atmospheres.
Nguyên tố hoá học là gì
Nguyên tố hóa học, thường được gọi đơn giản là nguyên tố, là một chất hóa học tinh khiết, bao gồm một kiểu nguyên tử, được phân biệt bởi số hiệu nguyên tử, là số lượng proton có trong mỗi hạt nhân.
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Give reasons. 1. There is interrelation between wildlife and vegetation 2. Various activities of the man have helped for the survival of the wildlife. 3. Establishment of national parks and wildlife conservation area help for the protection of wildlife. 4. Different animals are put under Red List. 5. Giant hornbill is critically endangered species in Nepal. Answer the following questions.
Answer:
Yes
Explanation:
Place the above in a interrelating concept map include were physical changes and chemical changes would take place list several types of physical changes and chemical changes
[tex]{\huge{\pink{↬}}} \: \: {\huge{\underline{\boxed{\bf{\pink{Answer}}}}}}[/tex]
Hand tools in need of repair or replacement create hazards. Tools with wooden handles, like hammers and axes, can splinter or break in the middle of use, resulting in injury. Impact tools like chisels are unsafe for use if they have “mushroomed” heads because they could shatter on impact and cause injury.
Can someone plz help me plz giving brainliest
Answer: yes because it talks about what he pacifically he did and what the results was and he would probably need 2 get a little more data
Explanation:
GABReva 2. Explain the usefulness of friction
Answer:
Friction always slows a moving object down. ... Friction can be a useful force because it prevents our shoes slipping on the pavement when we walk and stops car tyres skidding on the road. When you walk, friction is caused between the tread on shoes and the ground. This friction acts to grip the ground and prevent sliding.
Isotope ?-1 has an atomic mass of 1.
99.985% of all atoms of element ? are of this
form.
Isotope ?-2 has an atomic mass of 2
0.015% of all atoms of element ? are of this form.
Answer: Isotope-1: Hydrogen (H)
Isotope-2: Deuterium (H)
Explanation: The periodic table shows that the smallest element in hydrogen (H), at an average atomic weight of 1.008. Hydrogen-1 has one proton, one electron, and no neutrons, which adds to 1 AMU. Hyrogen-2 is an isotope of hydrogen that contains 1 neutron in addition to the proton, bringing the mass to 2 AMU. It is only at 0.0156% abundance on Earth and is given the name Deuterium, sometimes refered to as "heavy water" when incorporated into a water molecule. A third isotope has 2 neutrons, and is called Tritium.
any integrated chem buffs out there?
The field of study that Christian Doppler's work influenced the most was about light waves.
Hope it helps you.
985 grams converted to kilometers
Answer:
?
Explanation:
did you mean kilograms?
how to calculate valency of atoms?
Answer:
The valency of a molecule is zero.
Explanation:
Valency is calculated by calculating number of electrons present in outermost orbitals of atom of element.
Hope it is helpful.....Answer in word.
1)What is the principal of chromatography?
Answer:
chromatography is based on the principle where molecules in mixture applied onto the surface or into the solid, and fluid stationary phase is separation from each other while moving with the aid of a mobile phase.
Can you join please.
It's urgent for help.
how many g/mL are in 12cg/L
Answer:
0.00012 g/ml
Explanation:
g are 100 x cg, and litres are 1000 x ml, so the number 12 needs to be divided by 100 x 1000 = 100,000 in order to get the correct result.
But you can also work through and figure it out logically.
1 cg = 0.01 g, so 12 cg = 0.12 g
So you have 0.12 g in 1 litre, which is 0.12 g in 1000 ml.
This means that in 1 ml you have 0.12/1000 = 0.00012 g.
please help if there are any experts please tell me whhich is correct
I believe that the answer to your question is letter D, normal line.
Additionally, according to the law of reflection, the angle of incidence is equivalent to the angle of reflection. This means that the angle of reflection is the angle between the normal line and the reflected ray.
I hope that this has helped you. Good day to you.
Which of the following are decomposition reactions?
A. CH4 (9) +202 (9) - CO2 (g) + 2H20 (9)
B. N2 (9) + 3H2 (9) ► 2NH3 (9)
C. CaCO3 (s) - Cao (s) + CO2 (9)
D. 2H20 (1) ► 2H2 (9) + O2 (9)
Answer:
C and D
Explanation:
A reaction is said to be decomposed, if the reactant is broken down to liberate single element.
Classify the items based on whether they are or are not matter.
Answer:
Matter:
toothpaste
gasoline
bacteria
cell
Not matter:
happiness
sound
Explanation:
Matter is something that has mass and volume. Happiness is just a feeling, it doesn't exist in 3d world. Sound is a wave or just the movement of matter (particles of matter). Others have masses and volumes.
To reduce the costs of extracting aluminum, what must be added to it to reduce the melting point? A. Bauxite B. Cryolite C. Cathode D. Anode
Answer:
cryolite
Explanation:
B B B B B
cryolite is the answer
Which group on the periodic table will react with oxygen to give covalent compounds with formula XO2?
Explanation:
group 1 elements reacts with oxygen
When NaCl is added to a solution of AgNO3, Pb(NO3)2, or Ca(NO3)2, in which case(s) does a precipitate fom?
A. AgNO3 only
B. Pb(NO3)2 only
C. Ca(NO)2 only
D. AgNO3 and Pb(NO3)2
When NaCl is added to a solution of AgNO₃, Pb(NO₃)₂, or Ca(NO₃)₂,a precipitate will form only in Ca(NO₃)₂ only.
What is double displacement reaction?In a double displacement reaction, the reacting substances exchange their ions or bonds and form new compounds
In a double displacement reaction, only ionic compounds can take part and compounds of only those metal reacts which will be almost having equal reactivity.
For example -
Sodium chloride can react with Potassium sulphate to form Sodium sulphate and Potassium chloride.
Barium nitrate can react with Lead sulphate to form Barium Sulphate and Lead nitrate.
Therefore, When NaCl is added to a solution of AgNO₃, Pb(NO₃)₂, or Ca(NO₃)₂,a precipitate will form only in Ca(NO₃)₂ only.
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What is the pH of [tex]0.025\times10^-^2[/tex]M [tex]NaOH[/tex]
Answer:
3.60
Explanation:
Just use the log function on your calculator, the number you get transform it to positive
- log [tex](0.025x10^{-2}[/tex]) = 3.60
What is the density of a piece of metal with a
mass of 23.5 g and a volume of 11.1 mL? You
will report in units of g/mL. Please answer only
with a number. Include only two decimals in
your answer.
The density of the piece of metal is 2.12g/mL
HOW TO CALCULATE DENSITY:
Density, which refers to the mass of an object in relation to its volume, can be calculated by dividing mass by volume. That is;Density (g/mL) = mass (g) ÷ volume (mL)
According to this question, a piece of metal has a mass of 23.5 g and a volume of 11.1 mL, hence, the density can be calculated as follows:Density = 23.5/11.1
Density = 2.12g/mL
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Sugar C12 H22 011 can be classified as a element, heterogeneous mixure, solution, compound
Answer:
The answer is a compound.
it is a compound as it contains different elements
Explanation:
What is the energy of a light wave with a frequency of 9.8 x 10^20 Hz?
Answer:
Regions of the Electromagnetic Spectrum
Wavelength (m)Frequency (Hz)Radio> 1 x 10-1< 3 x 109Microwave1 x 10-3 - 1 x 10-13 x 109 - 3 x 1011Infrared7 x 10-7 - 1 x 10-33 x 1011 - 4 x 1014Optical4 x 10-7 - 7 x 10-74 x 1014 - 7.5 x 1014
will mark brainliest if correct
Answer:
that would be B
Explanation:
how did they start water conservation in tamil nadu . short answer
Answer:
Historically,Tamil Nadu is known for its temple tanks and community tanks that not only save water for summer but also act as artifical ground water recharge structures. It also set an example by making rain water harvesting mandatory in all building. But now water crisis associated with monsoon failure for consecutive years had lead it to a desperate situation.
The table shows the charge on three unknown subatomic particles,
Charged Particles
Particle Charge on Particle
A
Positive
B
B
No charge
С
Negative
Which particle is most likely present in the nucleus of the atom?
O Only particle A
O Only particle C
O Both particles A and B
Both particles B and C
Answer:
Both particles A and B
Explanation:
A nucleus contains both protons and neutrons .
But protons are positively charged whereas neutrons have no charge.
[tex].[/tex]
Both particles A and B are most likely present inside the nucleus of the atom. Therefore, option (c) is correct.
What is the nucleus of an atom?The nucleus of an atom contains the particles protons and neutrons. Both the solid particles in an atom are responsible for 99.9% of the mass in the nucleus.
The protons are the positively charged particles that lie inside the nucleus. Therefore, the nucleus of an atom has a positive charge on it while the negatively charged electrons rotate around the nucleus.
The neutrons do not carry any charge. So we can say that the neutrons are neutral. Therefore, the charge on the nucleus is only due to protons.
The atomic powers which are holding the protons and the neutrons inside the nucleus are also vast. The protons are prsent very close to each other inside the tiny nucleus, so the electrostatic forces of repulsion act in the nucleus.
Therefore, particles with no charge and positive charge are most present in the nucleus of the atom.
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What are the answers to these?
Answer:
1)physical change
Explanation:
2)chemical change
My friend asked, Our sale is being used to measure
flour. What was the scale really measuring about
the flour?
A) color of flour
B) volume of flour
C) weight of flour
D) temperature of flour
Los elementos que forman aniones con carga -1 y una capa externa estable de ocho electrones pertenecen al grupo de los:
Los elementos que forman aniones con carga -1 y una capa externa estable de ocho electrones pertenecen al grupo de los: halógenos.
Para alcanzar la estabilidad, los átomos siguen la regla del octeto: ganan, pierden o comparten electrones para tener 8 electrones en su capa externa (capa de valencia).
Los elementos del Grupo 17 de la Tabla Periódica, conocidos como halógenos, tienen 7 electrones en su capa de valencia. Así, tienden a ganar 1 electrón para completar su octeto. Como los electrones tienen carga negativa, al ganar 1 electrón los aniones quedan con una carga de -1.
Puedes aprender mas sobre la regla del octeto aquí: https://brainly.com/question/18892451
How might you separate a mixture of iron fillings and salt?
Answer:
You use a magnet and the fillings will go with the magnet.