Answer:
When atoms are excited they emit light of certain wavelengths which correspond to different colors. Each element produces a unique set of spectral lines. Since no two elements emit the same spectral lines, elements can be identified by their line spectrum.
Explanation:
What is the connection between the Bohr Model and Atomic emission spectra of elements?
Explanation:
electrons move arround nucleus in the orbit such as sun in suria system..
Please help me and I’ll give you brainiest!!!!!!!!!
Have a wonderful day!!:)))
Answer:
up down up down thats the pattern
Explanation:
Calculate the volume (in cm³) of 935 grams of steel. The density of steel is 7.8 g/cm³. Give your answer to 2 decimal places.
Answer:
119.87 cm³Explanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\[/tex]
From the question we have
[tex]volume = \frac{935}{7.8} \\ = 119.871794...[/tex]
We have the final answer as
119.87 cm³ to two decimal placesHope this helps you
A high school chemistry teacher asks four student groups to determine the number of protons, neutrons, and electrons (respectively) present in an ion of Titanium (Ti 2+). Which student group provides the best answer?
Answer:
Electrons - 20
protons - 22
neutrons - 26
Explanation:
Titanium has an atomic number of 22 indicating that the neutral atom has 22 protons.
Ti 2+ has lost two electrons and contains only 20 electrons, 22 protons.
The mass number of titanium is 48. Hence;
Mass number = atomic number + number of neutrons
Since the atomic number is 22 and the mass number is 48
number of neutrons = 48 - 22 = 26 neutrons
PLEASE HELP WITH THESE TWO QUESTIONS
2.) 50.0 grams of water at 100 degrees Celsius evaporated to water vapor 2 points
at 100 degrees Celsius. Calculate the amount of heat required for this
conversion.
2. A student measured 15.0 grams of ice in a beaker. The beaker was then
placed on a hot plate where it was heated uniformly for a certain amount
of time. During the melting process of the ice, the student noted that the
temperature was at 0 degree Celsius. When all the ice converted to water,
the final temperature was also at 0 degree Celsius. How much heat was
used to melt the ice?
1. Q=112.8 kJ
2. Q=5.01 kJ
Further explanationThe heat required for phase change :
melting/freezing :Q = mLf
Lf=latent heat of fusion
vaporization/condensationQ = mLv
Lv=latent heat of vaporization
1.
m=50 g=0.05 kg
Lv (water) = 2256 kJ/kg
[tex]\tt Q=0.05\times 2256=112.8~kJ[/tex]
2.
m=15 g=0.015 kg
Lf for water = 334 kj/kg
[tex]\tt Q=0.015\times 334=5.01~kJ[/tex]
eter explores the periodic table and how atoms can combine to form compounds. He uses beads with different sizes and colors as models. Each different type of bead represents atoms from a different element.
How can Peter best use the beads to show how compounds form in nature?
Answer is B- He can arrange the beads into various formations using different colors and sizes multiple times
Explanation: I hope the helped!
Peter can arrange the beads into various formations using different colors and sizes multiple times.
What is Periodic Table ?The periodic table, also known as the periodic table of the elements, is a tabular display of the chemical elements. It is widely used in chemistry, physics, and other sciences, and is generally seen as an icon of chemistry.
In order to show how compounds form in nature, the beads will be assigned to the different elements on the periodic table according to the following arrangements;
The beads representing the elements of each group in the periodic table will all have the same colorThe sizes of the beads within each group will increase from the top to the bottom of the groupWith the above arrangements, it will be possible to show the affinity and proportion of the elements in the compound formed in nature.
Therefore, Peter can arrange the beads into various formations using different colors and sizes multiple times.
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PLS PLS HELP
this is science
Answer:
its minerals :)
Explanation:
i hope its right
alsooo heyyyy
Answer:
minerals!!!!! i think anyway
Explanation:
PLEASE HELPPP
A(n) _________is a
group of atom. joined by chemical bonds.
THIS IS SCIENCE NOT CHEMISTRY
Answer; molecule
Explanation:
Which of the following characterizes a reaction at equilibrium?
A reaction comprises a reactant and a product. It is said to be in equilibrium when the rates for the forward and reverse reactions are equal. Thus, option D is correct.
What is an equilibrium reaction?An equilibrium reaction is a thermodynamic condition where the reactants and the products are at a stable position even before and after the reaction. They remain fixed and do not vary with the addition of any catalyst.
In the equilibrium position, the reaction rate of the forward (product formation) and reverse (reactant formation) remains the same and is seen in the reversible reactions only.
The amount of the products and the reactant remains constant till the temperature is constant but may vary if the tempearture is varied.
Therefore, the rate of reverse and forward are equal in the equilibrium reaction.
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1. Under what conditions can potassium bromide conduct electricity?
A only when melted
B. when melted or dissolved in water
C. only when it is in crystal form
D. only when dissolved
Answer:
potassium bromide can only conduct electricity when in an aqueous solution due to the electrostatic force between the ionic bonds
The potassium bromide can conduct electricity when melted or dissolved in water. Therefore, option (B) is correct.
What are ionic compounds?The crystalline solids which are formed by closely packed ions of opposite charge are called ionic compounds. In ionic compounds, the ions are connected with each other by ionic bonds in solis state.
The elements which can gain or lose electrons to attain their nearest noble gas configuration participate in the formation of ionic compounds. The solid ionic compound cannot able to conduct electricity.
In the melted state, the ions of K⁺ and Br⁻ can move from their fixed positions. Therefore, the KBr can conduct electricity when melted or dissolved in water.
The ionic compounds are able to conduct electricity in melted or dissolved in water. Because only in these states the ins can move freely while in the crystalline state the ions cannot move freely to conduct electricity.
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simply parmanent tissue real life application please help it's for my project
2.303 3-5.05x10-3
1 | - 1
T2298
Answer:
230,294.9 I think it's fine just try your past or ask teacher help
What happens during every chemical change?
A. Heat or light is produced.
B. Two substances combine to make a different substance.
C. One type of matter becomes another type of matter.
D. Matter changes from one state to another.
pleaase helpppp
Answer:
D
Explanation:
ahh i think,
AHH JUST LET ME SEND ITTT
Answer:
its one type of matter becomes another type of matter
Explanation:
it was that for a p e x
What pressure is required to compress 200 liters of air at 100 atmosphere into a
cylinder whose volume is 20.0 liters?
Answer:
P₂ = 1000 atm
Explanation:
Given data:
Initial volume of air = 200 L
Initial pressure = 100 atm
Final volume = 20.0 L
Final pressure required = ?
Solution:
The given problem will be solved through the Boly's law,
Mathematical expression:
P₁V₁ = P₂V₂
P₁ = Initial pressure
V₁ = initial volume
P₂ = final pressure
V₂ = final volume
Now we will put the values in formula,
P₁V₁ = P₂V₂
100 atm × 200 L= P₂ × 20.0 L
P₂ = 20,000 atm. L/ 20.0 L
P₂ = 1000 atm
How many moles of cesium carbonate will be produced when 5.34 moles of cesium reacts with iron (III) carbonate? (You must write and balance the formula equation!)
Answer:
2.67 moles of cesium carbonate (Cs2CO3).
Explanation:
We'll begin by writing the equation for the reaction. This is illustrated below:
Cs + Fe2(CO3)3 —> Cs2CO3 + Fe
The above equation can be balance as follow:
There are 2 atoms of Fe on the left side and 1 atom on the right side. It can be balance by putting 2 in front of Fe as shown below:
Cs + Fe2(CO3)3 —> Cs2CO3 + 2Fe
There are 3 atoms of C on the left side and 1 atom on the right side. It can be balance by 3 in front of Cs2CO3 as shown below:
Cs + Fe2(CO3)3 —> 3Cs2CO3 + 2Fe
There are 6 atoms of Cs on the right side and 1 atom on the left. It can be balance by putting 6 in front of Cs as shown below:
6Cs + Fe2(CO3)3 —> 3Cs2CO3 + 2Fe
Thus, the equation is balanced.
From the balanced equation above,
6 moles of Cs reacted with 1 mole of Fe2(CO3)3 to produce 3 moles of Cs2CO3.
Finally, we shall determine the moles of cesium carbonate (Cs2CO3) produced by the reaction of 5.34 moles of cesium (Cs). This can be obtained as follow:
From the balanced equation above,
6 moles of Cs reacted to produce 3 moles of Cs2CO3.
Therefore,
5.34 moles of Cs will react to produce = (5.34 × 3)/6 = 2.67 moles of Cs2CO3.
Thus, 2.67 moles of cesium carbonate (Cs2CO3) were produced from the reaction.
An object has a mass of 67.4 ounces and a volume of 13.8 cups. What is the density? _______ oz/cup (your answer should *only* be a number, round to one decimal place if needed) *
Answer:
4.9
Explanation:
Given data:
Mass of object = 67.4 ounce
Volume = 13.8 cup
Density = ?
Solution:
d = m/v
d = 67.4 ounce/13.8 cup
d = 4.9 oz/cup
Thus, density of object is 4.9 oz/cup.
Calculate the mass of 0. 4 moles of water.
Answer:
7.208 g
Explanation:
0.4mol x [tex]\frac{2(1.01) + 16.00 g}{1 mol}[/tex]
= 7.208 g
You are using molar mass of H20 to find the mass. Moles of 0.4 and 1 mol cancel out leaving you with just grams. You get the values in the numerator from the periodic table and the 2(1.01) is because you have 2 of the H in H20
If a disease destroying barley plants in a field swept through an ecosystem, what would happen to the barley eating bird populaiton in the field?
Answer:
It would decrease
Explanation:
In an ecosystem, organisms feed on one another for survival due to the fact that energy needed for metabolic activities in individual organisms can only be obtained via food. This question depicts that certain bird population feeds on barley plant in an ecosystem.
However, If a disease attacks the plants in such a way that it destroys the barley plants in the field, this would cause the barley-eating bird population to DECREASE because their food source has been affected.
Answer:
the barley-eating bird population in the field would decrease.
Explanation:
The graph shows a car's velocity over time. Velocity versus Time 60 40 Velocity, in mph forward 30 20 10 4 1 2 3 5 G Time, in seconds (s) What is the car's acceleration from 0 to 1 second? A. 8 mph/s B. 60 mph/s C. 10 mph/s D. 20 mph/s
The car acceleration form 0 to 1 will be 20 mph/s.
What is acceleration?The rate at which an object's velocity changes with respect to time is called acceleration. Accelerations are measured in terms of vectors. The orientation of the force is acting on an item determines the orientation of its acceleration. Acceleration can be calculated by using this formula:
a = v-u/ΔT.
where, a = acceleration, v = final velocity, u = initial velocity and T is temperature.
Calculation of acceleration.
It is given that v = 20 , u = 0,
ΔT can be calculated as,
[tex]=T_{2} - T_{1} \\= 2-1\\ = 1[/tex]
Now , put the values given data in acceleration formula
a = 20-0/ 1
= 20 mph/ s.
Therefore, acceleration of car will be 20 mph/s.
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-Particle Conversions
How many moles of Lithium are in 7.15 x 1024 atoms of Lithium?
Answer:
The answer is 11.88 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\ [/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{7.15 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 11.87707641...[/tex]
We have the final answer as
11.88 molesHope this helps you
PLEASE HELP ASAP
A beach ball has a mass of 5g a volume of 20cm3. What is the object's density?
Answer:0,25 g/cm3 creo
Explanation:densidad es masa entre volumen
Answer:
0.25 g/cm³
Step-by-step explanation:
As we know
The density is given by
Density = Mass / Volume
Putting the values
Density = 5g / 20 cm³
Density = 0.25 g/cm³
Sorry if wrong I'm not great at math!
10 g of copper is heated and the mass increases to 12.5 g. What is the mass of the copper in the new substances? show with steps
Answer:
10 g
Explanation:
The heating of copper can be represented by the following equation:
Cu + 1/2O2 ----> CuO
The new substance is copper oxide, CuO.
From the law of conservation of matter which says that matter can neither be created nor destroyed but be converted from one form to another, it means that barring any loss during heating, all the Cu should be converted to CuO. Hence, the amount of copper in the new substance should remain 10 g.
Choose the coefficient for blank 1 (in front of C)
___ C + ___ S8 --> ___ CS2
2
1
3
4
Answer:
;l ok
Explanation:
do you agree or not that evidence is only used to back scientific laws and provide evidence why or why not!!!!!! thank you, will mark brainliest to whoever does it correct the 1st time what i asked!!!!!!!!!!
Answer:
yes, because evidence from scientifically research studies, is important because it lets us make decisions based on what works with studies of science we can know if this is right or not
Explanation:
Hope i helped~
check wether all the answers are correct or not. please?
Answer:
c
your answer is correct
Ammonia is formed from the reaction of nitrogen and hydrogen according to the equation:
N2(g) + 3H2(g) 2NH3(g)
What is the maximum number of moles of ammonia that can be formed from the reaction of 27 moles of hydrogen?
A
41
B
27
18
D
9
Answer:
18 mol NH₃
General Formulas and Concepts:
Chemistry - Stoichiometry
Using Dimensional AnalysisExplanation:
Step 1: Define
RxN: N₂ (g) + 3H₂ (g) → 2NH₃ (g)
Given: 27 moles H₂
Step 2: Stoichiometry
[tex]27 \ mol \ H_2(\frac{2 \ mol \ NH_3}{3 \ mol \ H_2} )[/tex] = 18 mol NH₃
Step 3: Check
We are given 2 sig figs.
Since our final answer is in 2 sig figs, we do not need to round.
5 points
An atom has a mass number of 65. Its number of
neutrons is the sum of its atomic number and 3. How
many protons, neutrons, and electrons does this atom
have? What is the identity of this atom? *
(justify your answer step by step!)
Answer:
25 protons, 25 electrons, 30 neutrons. ......... manganese is the identity
Explanation;
x = atomic number -# of protons
The number of neutrons = x + 5
The mass number (sum of protons + neutrons) = 55.
x + (x + 5) = 55
2x + 5 = 55
2x = 50
x = 25; atomic number 25 = manganese (Mn)
so ;
25 = Protons
30=Neutrons
25=Electrons
how can the molar mass of a gas can be determined
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Check the correct box to describe the periodic trends in electronegativity.
Electronegativity across a period:
decreases.
increases.
Electronegativity down a group:
decreases.
increases.
Electronegativity across a period: increases.
Electronegativity down a group: decreases.
Explanation:
Just did on Edge 2021
Electronegativity across a period increases and Electronegativity down a group decreases.
What is Electronegativity ?Electronegativity, symbolized as χ, is the tendency for an atom of a given chemical element to attract shared electrons when forming a chemical bond.
An atom's electronegativity is affected by both its atomic number and the distance at which its valence electrons reside from the charged nucleus.
On the periodic table, electronegativity generally increases as we move from left to right across a period and decreases as you move down a group.
As a result, the most electronegative elements are found on the top right of the periodic table, while the least electronegative elements are found on the bottom left.
Hence, Electronegativity across a period increases and Electronegativity down a group decreases.
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What role does the Automated Surface Observing Systems (ASOS) play in weather forecasting?
Answer:
What role does the Automated Surface Observing Systems (ASOS) play in weather forecasting? It is a system of radar sensors used to track storms. It is the nation's primary weather-observing network. It provides weather reports much like the National Weather Service.
Explanation:
Answer:
the answer is c).It is the nation's primary weather-observing network.
Explanation: