Answer:
"The number of protons in one atom of an element determines the atom's identity, and the number of electrons determines its electrical charge. The atomic number tells you the number of protons in one atom of an element. It also tells you the number of electrons in a neutral atom of that element."
Explanation:
-irion-isd.org:)
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The number of protons in an element's atom is represented by the element's atomic number. The atomic number identifies the element because the number of protons establishes the identity of the element.
What is atomic number ?The charge number of an atomic nucleus is the chemical element's atomic number, also known as nuclear charge number. This is the number of protons present in the nucleus of each atom of that element, or the proton number, for conventional nuclei.
The number of protons in an atom is the atomic number. It is sometimes referred to as the proton number for this reason. The capital letter Z is used to represent it in calculations.
The word zahl, which translates to "number of numerals" in German, or "atomzahl," a more recent word that means "atomic number," are the origins of the letter Z.
Thus, the number of protons in an element's atom is represented by the element's atomic number. The atomic number identifies the element because the number of protons establishes the identity of the element.
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Calculate the density of an object with a mass of 20 grams and a volume of
1000 cm3
Answer:
20/1000=0.02 denity+mass divided by volume
Can someone please help me!!??
Answer:
cyfctr rytfuhv
Explanation:
how many joules are needed to melt 24.9 grams of ice at 0° C?
.) Which statement is true? (A) At a given temperature, the temperature value is a measure of the total kinetic energy of all the molecules. (B) At a given temperature, all the particles have the same amount of kinetic energy. (C) At a given temperature, the average kinetic energy of the molecules is constantly changing. (D) At a given temperature, the temperature value is a measure of the average kinetic energy of all the molecules.
Answer:
(D) At a given temperature, the temperature value is a measure of the average kinetic energy of all the molecules.
Explanation:
Kinetic energy is defined as the energy of an object due to its motion.
Kinetic energy remains the same at a constant temperature but increases with an increase in temperature.
At a given temperature, the temperature is the measure of the average kinetic energy of all the molecules. With the increase in temperature of the molecule, some of the absorbed energy is stored within the particles and some of the energy contributed to the motion of the molecules. This causes change in average kinetic energy of molecules due to an increase in temperature.
The root mean square (RMS) speed of the molecules is the square root of the average of each individual velocity squared.
Hence, the correct answer is "(D)."
Under the right conditions, sodium (Na) and chlorine (Cl) can chemically combine to form sodium chlorine. Which of the following best explains how sodium and chlorine are able to create sodium chlorine?
A: sodium and chlorine exchange neutrons between eachother when they combine
B: electrons are transferred between sodium and chlorine when they combine
C: extra protons are created when both sodium and chlorine combine
D: The nucleus of both sodium and chlorine combined together
Answer:
I am pretty sure the answer is B
Explanation:
Which of the following is an alkaline earth metal. Hh
Answer:
The alkaline earth metals are six chemical elements in group 2 of the periodic table. They are beryllium, magnesium, calcium, strontium, barium, and radium.
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When the hot iron block is placed in the beaker containing room temperature water, what happens to the kinetic energy of the water?
You observe a car parked on the side of the road. If the car started to move, Which conclusion could you make?
The forces were balanced when the car was parked, but one or more forces changed. The total forces became unbalanced, causing it to move.
The forces were unbalanced when the car was parked. When the car moved, they became balanced.
The forces were balanced when the car was parked. The forces stayed balanced when it moved.
The forces were unbalanced when the car was parked, and two or more forces changed. The forces stayed unbalanced and caused the car to move.
Answer:
it was stable because of it was in Potential energy and unstable because it was in kinetic energy or vice Versa. im somehow confused
The density of aluminum is 2.7 g/ml. What is the volume of 8.1 g?
Answer:
volume= 3
Explanation:
D=m/v
2.7=8.1/v
2.7v=8.1
8.1/2.7= 3
8.1/3= 2.7 which is the density!
Answer:
3 mL
Explanation:
[tex]V = \frac{8.1 g}{3 mL} = 2.7 g/mL[/tex]
Sodium combines with water to produce sodium hydroxide and hydrogen gas. Which word equation represents this violent reaction? sodium hydroxide + water Right arrow. Sodium + hydrogen sodium + water Right arrow. Sodium hydroxide + hydrogen sodium + hydrogen Right arrow. Sodium hydroxide + water sodium + sodium hydroxide Right arrow. Water + hydrogen
Answer:
Explanation:
When Sodium reacts with water it forms Sodium hydroxide and hydrogen gas. Sodium being a alkali metal reacts violently with water and catches fire during this reaction
word equation
[tex]Sodium+Water[/tex]→[tex]Sodium Hydroxide+ hydrogen gas[/tex]
Chemically
[tex]2Na(s) + 2H2O[/tex]→[tex]2NaOH(aq) + H2(g)[/tex]
Sodium hydroxide and hydrogen gas are formed when sodium combines with water. As an alkali metal, sodium interacts violently with water, catching fire in the process.
Word equation:-
Sodium+Water →Sodium hydroxide+hydrogen
Chemically, the reaction is as follows:-
[tex]2Na+2H_2O\rightarrow2NaOH+H_2[/tex]
Na-Sodium
[tex]H_2O[/tex]-Water
NaOH-Sodium hydroxide
[tex]H_2[/tex]-hydrogen
Hence, the word equation is:-
Sodium+water Right arrow Sodium hydroxide+hydrogen
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Answer:
Explanation:
"Sublimation is the transition of a substance directly from the solid to the gas state, without passing through the liquid state."
This MIGHT be wrong, so dont assume this is the exact answer. Thats just what the internet says....
Hope I helped!!!
-Alexis ❤
explain how a bright-line spectrum is produced, in terms excited state, energy, and ground state
Answer:
cuz the light is a fraction of the world is screens like: tablets,tv,phones,computers. so the world is like nothing to anyone revolves around electronics so if you lost your electronic for 3 days.....could you do it???? (p.s the finge is pointing at you)
Explanation:
please answer I will give brainiest to who helps. On the morning of a birthday party, a balloon is filled with 8.5 L of helium (He) when the temperature is 294 kelvin. The party starts at 4:00 p.m., at which time, the temperature has risen to 305 kelvin. What is the new volume of the balloon?
Answer:
V₂ = 8.8 L
Explanation:
Given data:
Initial volume = 8.5 L
Initial temperature = 294 K
Final temperature = 305 K
Final volume = ?
Solution:
The given problem will be solve through the Charles Law.
According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.
Mathematical expression:
V₁/T₁ = V₂/T₂
V₁ = Initial volume
T₁ = Initial temperature
V₂ = Final volume
T₂ = Final temperature
Now we will put the values in formula.
V₁/T₁ = V₂/T₂
V₂ = V₁T₂/T₁
V₂ = 8.5 L × 305 K / 294 k
V₂ = 2592.5 L.K / 294 K
V₂ = 8.8 L
3. How is the transfer of energy different in electromagnetic waves
compared to mechanical waves?
Answer:
Electromagnetic waves are produced by the vibration of charged particles. ... A mechanical wave is a wave that is not capable of transmitting its energy through a vacuum. Mechanical waves require a medium in order to transport their energy from one location to another. A sound wave is an example of a mechanical wave.
Explanation:
HELP!!!! I HAVE 2 MINUTES!!!
A substance placed into an open plastic container at room temperature exerts a force against the bottom of the container but not the sides of the container. What is the most likely phase of this substance?
A. gas
B. solid
C. liquid
D. plasma
Answer:
a solid
Explanation:
because because gas would excerpt forced throughout the whole container and plasma would be too hot for the plastic container and liquid would flow throughout the container touching the sides and solid is the only one that would probably only touch the bottom of the plastic container exerting force through there
How many conversion factors would be used to convert 20 hectoliters to milligrams?
Help please❤️
Answer:
From unit Symbol Equals Result To unit Symbol
Explanation:
is this volume??? i need specifics
Which happens during crossing over?
Two sex cells join together and combine DNA.
Genes are exchanged between two alleles.
Genes are exchanged between two egg cells.
Chromosomes line up randomly during metaphase I.
Answer:
Chromosones line up randomly during Metaphase |
Explanation:
Answer:
answer is d
Explanation:for all you edge 2020 people :)
Which sentences describe disadvantaged of burning fossil fuels instead of using hydrogen fuel cells
Explanation:
thanks thanks thanks thanks thanks
Burning fossil fuels takes place inside expensive fuel cells.
Fossil fuels are nonrenewable.
Which of the following identifies a type of electromagnetic radiation with a higher frequency than Microwaves but a lower frequency than Ultraviolet waves?
Radio waves
X-rays waves
Gamma waves
Infrared waves
Answer:
infrared
Explanation:
it goes (in increasing order)
radio
microwave
infared
visible light
ultraviolet
xray
gamma ray
The infrared radiation in the electromagnetic spectrum is come in between ultraviolet waves and microwaves. It have high frequency than microwave and low frequency than UV rays. Thus option D is correct.
What is electromagnetic spectrum?Electromagnetic spectrum is the arrangement of different radiations in the order of increasing frequency or increasing energy thus in the decreasing order of wavelength.
The longer wave is radio waves with lowest energy and then microwave after that infrared waves are arranged in the spectrum. Thus next from visible light to UV, gamma and x-rays energy and frequency increases.
Higher wavelength radiations are less powerful but travel more distance where as shorter waves are more powerful but travel less. Thus, the radiation have less frequency than UV rays but high frequency than microwave is Infrared rays. Option D is correct.
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what did the Copernican revolution demonstrate?
Answer:
The Copernican Revolution was the paradigm shift from the Ptolemaic model of the heavens, which described the cosmos as having Earth stationary at the center of the universe, to the heliocentric model with the Sun at the center of the Solar System.
Explanation:
From Google
Four balls made of different materials are placed on a tabletop 2 meters from the floor.
Ball
Material
Mass
A
Styrofoam 5g
B
Rubber 18g
C
Plastic (hollow) 2g
D
Solid plastic 21g
Which ball has the GREATEST amount of potential energy?
Answer:
Styrofoam
Explanation:
Please help me with my science work
Answer:
what question do you need help with
Explanation:
Four materials are put into small containers. These materials are then moved from the small containers into larger containers. Which material will spread out to completely fill a larger container?
Answer quickly please
A.Air
B.Ice
C.Sand
D.Water
Answer:
Air
Explanation:
Air expands
Please I need help ASAP . I will mark brainliest
Answer:
1） add water
Explanation:
What occurs after cytokinesis is completed at the end of meiosis I?
Four haploid cells are formed.
Two diploid cells are formed.
Two haploid cells are formed.
Four diploid cells are formed.
Answer:
c
Explanation:
dewqewqwwAnswer:
d
Explanation:
eweqwe
What is the mass percent of a sugar solution having 15 g sugar dissolved in 63 g of solution?
Answer:
23.81%
Explanation:
15 × 100
63
23.809%
23.81%
Which scientist had the first true atomic theory?
What is the reaction ship between cells and tissues
Answer:
the answer is a bc tissues are a bunch of cells clumped together and tissues make up organs
Explanation:
If Chicago had experienced its average highest temperature
in August, which month would have had the longest day? Explain your
reasoning.
If Chicago had experienced its average highest temperature in August, the longest day remains the same and that is the 21st of June.
What is the effect of temperature on the length of the day?The effect of temperature induces the combination of more direct rays of the sunlight as the result of the tilting of the earth's hemisphere towards the sun to receive more solar energy and possess a warmer temperature.
But the temperature of a particular region also depends on the humidity and other abiotic parameters. So, if Chicago had experienced its average highest temperature in August, it does not mean that the longest day is in the month of August. It will remain, as usual, i.e 21 June.
Therefore, if Chicago experienced its average highest temperature in August, the longest day remains the same and that is the 21st of June.
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Which condition must be met for conduction to occur?
particles must be large
particles must be small
particles must be in contact
particles must be spread apart
The condition that must be met for conduction to occur is particles must be in contact. Therefore, the correct option is option C.
What is conduction flow of heat?A pan heats up when you place it on the flame. It's because heat is transferred from the burner to the pan. Also, it allows any other utensil or pan to heat up. Yet after a while, the vessel cools down when you remove it from the heat. That happens because the vessel's heat is dissipated onto the surrounding area.
It enables the vessel to cool. Heat is passed from a warm object towards the cold object in both situations. Typically, it occurs in every situation. Conduction is the process through which heat is transported from one object's hot end to its cool end. The condition that must be met for conduction to occur is particles must be in contact.
Therefore, the correct option is option C.
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