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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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how can the molar mass of a gas can be determined
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]
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
help
if you start with a substance as a solid what will happen to the molecules as you add thermal energy (heat)?
Answer: One change of state happens when you add energy to the substance. This change of state is called melting. By adding energy to the molecules in a solid the molecules begin to move quicker and can break away from the other molecules.
Explanation: I hoped that helped!
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
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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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
7 types of motion you experience through the day.
Answer:
car is in the driveway
water is flowing in the river
a man is. walking in the road
a bird is flying in the sky
a tiger is running in the jungle
a tiger is running to eat a breakfast
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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Where is most of the water on earth found? What percentage?
Answer:
The ocean holds about 97 percent of the Earth's water; the remaining three percent is found in glaciers and ice, below the ground, in rivers and lakes. Of the world's total water supply of about 332 million cubic miles of water, about 97 percent is found in the ocean.
wait..if you asking about the country it's Brazil✌️
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.
-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
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~
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.
Two sphericle objects have masses of 8000 KG and 1500 KG their centers are separated by a distance of 1.5 M find the gravitational attraction between them
if I am correct I think its I'm am not 100 percent sure but I think this should be the answer
The gravitational force of attraction between them is 3.56 * 10⁻⁴ N
Using the formula of gravitational attraction
F = G*M1M2/d²
where G = 6.67 * 10⁻¹¹ Nm²Kg⁻²
M1 = 8000Kg
M2 = 1500 Kg
F = 6.67 * 10⁻¹¹ * 8000 * 1500 / (1.5)²
F = 3.56 * 10⁻⁴ N
The gravitational force of attraction between them is 3.56 * 10⁻⁴ N
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Answer:
up down up down thats the pattern
Explanation:
a sample of carbon dioxide gas occupies a volume of 20 L at standard temperature and pressure (STP). what will be the volume of a sample of argon gas that has the same number of moles and but tripled the absolute temperature?
Volume of Argon = 59.972 L
Further explanationIn general, the gas equation can be written
[tex]\large {\boxed {\bold {PV = nRT}}}[/tex]
where
P = pressure, atm
V = volume, liter
n = number of moles
R = gas constant = 0.08206 L.atm / mol K
T = temperature, Kelvin
At STP(0 C, 1 atm), 1 mol gas= 22.4 L
so for 20 L
[tex]\tt \dfrac{20}{22.4}=0.893[/tex]
For Argon
P = 1 atm
T = 273 K x 3 =819 K (tripled)
n = 0.893 (the same number of moles)
R = 0.082 L/atm.mol K
[tex]\tt V=\dfrac{nRT}{P}=\dfrac{0.893\times 0.082\times 819}{1}=59.972~L[/tex]
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Answer:
Explanation:
C
Choose the coefficient for blank 1 (in front of C)
___ C + ___ S8 --> ___ CS2
2
1
3
4
Answer:
;l ok
Explanation:
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!
Question 1
The best alternate headline for this article would be
o Scientists Find 500 Planets Outside Earth's Solar System
O Newly Discovered Exoplanet Has Earth-like Temperatures-Plus Water!
O Scientists Find "Goldilocks Zone" in Space-Neither too hot nor too cold!
Newly Discovered "Goldilocks" Planet Might Be Right for Life
Answer:
by Judith Curry On what we can learn from Goldilocks and The Three Bears ... In planetary science, the 'Goldilocks zone' is terminology for the the band ... We all know the fairy tale story of “Goldilocks and the three bears”, where GL ... as the discovery that the Earth was not the center of the solar system.
Explanation:
2. Leaves turning brown in the fall
Chemical or Physical or Both
What Evidences show that it’s Chemical, Physical, or Both:
An astronaut leaves Earth's surface and begins orbiting Earth. How will his departure from Earth affect his mass and weight?
What is it called when scientists in the same or similar field of study judge the quality of a fellow scientist’s scientific claim?
simply parmanent tissue real life application please help it's for my project
If I place a balloon in my fridge that initially has a pressure of 1.02 atm and a
temperature of 11.2 °C, what will be the pressure (in atm) of the balloon when it is
fully cooled to 4.00°C by my refrigerator?
Answer:
P₂ = 0.99 atm
Explanation:
Given data:
Initial pressure = 1.02 atm
Initial temperature = 11.2°C
Final pressure = ?
Final temperature = 4.00°C
Solution:
Initial temperature = 11.2°C (11.2+273 = 284.2 K)
Final temperature = 4.00°C (4.00+273 = 277 K)
According to Gay-Lussac Law,
The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.
Mathematical relationship:
P₁/T₁ = P₂/T₂
Now we will put the values in formula:
1.02 atm / 284.2 K = P₂/277 K
P₂ = 1.02 atm × 277 K / 284.2 K
P₂ = 282.54 atm. K /293 K
P₂ = 0.99 atm
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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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.
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..