Answer:
ITS D
Explanation:
Answer:
I did the test and the answer is A.
On the periodic table, what is a group? For the main groups, what characteristic
do the elements have in common?
In modern times, we know that the elements in a given group (also known as a family or column) have the same number of valence electrons, with ground state configurations having a consistent pattern, for instance:
F 1s2 2s2 2p5, Cl 1s2 2s2 2p6 3s2 3p5, Br 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p5, etc.
Of course, the ground state configurations play a major role in determining how an element reacts and what compounds it forms. Thus, the elements in a given group have similar properties.
The structure of the table also predicts how the properties vary. For instance, atomic radius increases down a group as does metallic character.
Hope this helps have a awesome day/night✨Explanation:
After one week there was a white solid but no liquid in the dish. What had happened to the water in the dish?
Answer:
it disappeared loll jk
it obviously dried
well you may Mark me as brainliest
What do LEGOs and DNA have in common?
Answer:
They are both building blocks
Explanation:
DNA builds up life while legos build things
please if you know help
the formula of copper sulfate crystals is CuSo4.5H2O. 400ml of 0.02mol/l copper (ii) sulfate solution is needed to be prepered .
a. calculate the molar mass of the solute .
b. calculate the mass of the solute that sould be weighted to prepare this solution .
c. describe in details the steps of preperation of the solution
Answer: a. 249.5 g/mol
b. 1.996 g
c. Measure 1.996 g of [tex]CuSO_4.5H_2O[/tex] and dissolve in water until the volume is 400 ml
Explanation:
Molar mass is the sum of atomic masses of all the elements present.
Thus molar mass of [tex]CuSO_4.5H_2O[/tex] = 1(63.5)+1(32)+4(16)+5(18) = 249.5 g/mol
Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.
To calculate the number of moles for given molarity, we use the equation:
[tex]\text{Molarity of the solution}=\frac{\text{given mass of solute}\times 1000}{\text {Molar mass of solute}}\times \text{Volume of solution in ml}}[/tex]
[tex]0.02mol/L=\frac{x\times 1000}{249.5g/mol\times 400}[/tex]
[tex]x=1.996 g[/tex]
c. We need to measure 1.996 g of [tex]CuSO_4.5H_2O[/tex] and dissolve it in water to make the volume 400 ml.
Describe particle movement in solid,liquid and gas
Answer:
In a solid, they're really close together and vibrate a LITTLE, in a liquid they're kinda close together but change movement because water will change shape depending on the container they're in. For gas they are spread far from each other and vibrate A LOT
Explanation:
What is the best description of the results of a chemical reaction
Answer:
the final reaction
Explanation:
a chemical reaction is caused from the two reactants
How many electrons does a phosphorus atom need to achieve a noble gas configuration
Answer:
Explanation:
In order to have a full shell it needs eight. It is easier to gain three electrons instead of losing five. Therefore phosphorus tends towards P3−
This environment has a lot of trees high temperatures and high humidity all year long which environment is this describing
Answer:
Rainforest
Explanation:
rainforests tend to have high humidity, explaining why you always sweat there. and including high temps.
Which statement gives two characteristics of all liquids?
They spread out to fill space and have atoms that vibrate in place.
They have atoms that vibrate in place and have a definite shape.
They will change shape to fit a container and have definite volume.
They have definite volume and have atoms that move freely in all directions.
Answer:
C
Explanation:
9. What is the atomic number of the atom in the diagram above?
Answer:
the atomic number of the atom can be determine through the number of protons in the nucleus
The protons are usually the atomic number.
Please help me with this! It’s not timed so take your time!
Answer:
pretty sure they're called groups
How much does the temperature over the land change in one day?
Answer:
13.7 degrees.
Explanation:
An unknown compound is found to have a molar mass of 392.16 g/mol. If the empirical formula is C2H5PF2, what is the molecular formula
Answer:
C8H20P4F8
Explanation:
Molecular formula is based off a ratio of the molecular formula's molar mass divided by the empirical formula's molar mass.
The molar mass of the empirical formula C2H5PF2 is 98.02g. We find this by adding the molar masses of all elements in the formula, multiplied by their subscripts.
2(12.01) + 5(1.01) + 30.97 + 2(18.99) = 98.02
We then divide the molecular molar mass by the empirical molar mass.
392.16/98.02 = 4
This tells us that the molecular formula has 4 times the mass of the empirical formula. Because mass comes from the elements in the formula, we multiply all the subscripts by 4 to get the molecular formula.
2x4 = 8
5x4 = 20
1x4 = 4
2x4 = 8
So the molecular formula is C8H20P4F8
Hey.... If I got a question in my exams of which metal does not react with hydrochloric acid and I write gold as the answer, will I get full marks on that questiona dn the whole exam paper in total????
Answer:
I think you would pretty much get the answer wrong.
You won´t get full credit. sorry for your wrong test answer, :(
Explanation:
The correct answer would be copper and mercury do NOT react with hydrochloric acid.
The picture above is a diagram of what earth-sun-moon phenomena?
A.Earth-Sun-Moon
B.Solar Eclipse
C.Lunar Eclipse
D.Orbit
if you do't know plz dont answer
Answer:
lets just say he got pay back btw it's lunar eclipse babe
Explanation:
How much heat would be needed to vaporize 450 g of silver?
Answer:
225
Explanation:
I hope it helps
How do the terms denature, catalyst, active site, and substrate relate to each other
Explanation:
The enzyme 's active site binds to the substrate. Increasing the temperature generally increases the rate of a reaction, but dramatic changes in temperature and pH can denature an enzyme, thereby abolishing its action as a catalyst. ... When an enzyme binds its substrate it forms an enzyme-substrate complex.
friend,please mark my answer in brainliest answersfriend,please follow me friend,please thanks this answerfriend,please vote it 5 starWhy are constellations and predictable locations in the night sky but planets are hard to find
Answer:
Because you can see the stars everynight pretty much, but the planets you need a telescope for. Plus, the planets are moving everynight making night and day so they all move! :)
Explanation:
Hope this helps! Brainliest plz?
24) Which of these lists the order of sublevels by INCREASING energy? *
3d, 4s, 4p
4s, 3d, 4p
4p, 3d, 4s
4s, 4p, 3d
Answer:
4s, 3d, 4p
Explanation:
(3d,4s,4p) and (4p, 3d, 4s) both are decreasing energy, while (4s,4p,3d) is incorrect order it should be (4s,3d,4p).
Which of the following will dissolve most rapidly?
A) Sugar cubes in cold water
B) powdered sugar in hot water
C) powdered sugar in cold water
D) sugar cubes in hot water
Answer:
The correct answer to your Question is B.
Explanation:
Hope you have a great day :)
The substance from the options that will dissolve most rapidly is : ( B ) Powdered sugar in hot water.
Factors responsible for solubilityIncrease in temperature, state of solute and volume will determine the rate at which solubility occurs. The powdered sugar is in less solid state when compared to sugar cubes and therefore will dissolve most rapidly in hot water than a sugar cubes in hot water.
Hence we can conclude that The substance from the options that will dissolve most rapidly is : ( B ) Powdered sugar in hot water.
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Here we see the valence shells of oxygen and magnesium.
How will the electrons react to make a stable product?
1 electron will move from oxygen to magnesium.
2 electrons will move from oxygen to magnesium.
1 electron will move from magnesium to oxygen.
2 electrons will move from magnesium to oxygen.
Answer:
2 electrons will move from magnesium to oxygen
Explanation:
Valence electrons have higher energy than the electrons in inner orbits, valence electrons participate in chemical reactions. A certain element's chemical characteristics can also be determined by the quantity of valence electrons that are present. The correct option is C.
What are valence electrons?The amount of electrons an atom must gain or lose in order to achieve the electrical configuration of the nearby noble gas or inert gas is known as valence. "Valence electrons" are described as "non-filled electrons in the outer shells."
The s and p electrons in the outermost shell are valence electrons. Core electrons are those found in the inner shell. Valence electrons are minuscule subatomic particles that we come across as we examine and investigate an element's atom. We can trace the valence electrons and forecast the sorts of bonds with the aid of Lewis structures.
'Mg' has two valence electrons and 'O' has six valence electrons. So 'Mg' loses its two electrons to 'O' to attain the octet.
Thus the correct option is C.
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what is the chemical formula for cuprous nitride
Answer:
Cu[NO(down arrow)3]^2
Explanation:
3 is a subscript and 2 is an exponent.
The rock in a particular iron ore deposit contains 78% Fe2O3 by mass. How many kilograms of the rock must a mining company process to obtain 1.0 x 103 kg of iron?
Answer:
103 so easy so free dogwater
Explanation:
Mass percentage does not have any unit as numerator and denominator contains the same unit. The mass of rock is 2.56×10⁶g when it contains 1.0 x 10³ kg of iron in it.
What is percentage by mass?Mass percentage represents the the percentage of each element that is making a particular compound.
Mathematically,
Percentage of mass = (component’s mass ÷ total mass) x 100%
Percentage of mass of ferric oxide is = 78% by mass in rock
From this we can interpret the following
100 g of rock contains = 78gram ferric oxide
(100÷78)g of rock contains= 1 gram of ferric oxide
mass of iron in rock =1.0 x 10³ kg = 1.0 x 10⁶ g
(100÷78)×1.0 x 10⁶ g of rock = 1.28×10⁶g of ferric oxide
now 1 mole of ferric oxide contains 2 atoms of iron, so the total mass of iron is 1.28×10⁶g ×2=2.56×10⁶g of iron.
Therefore the mass of rock is 2.56×10⁶g when it contains 1.0 x 10³ kg of iron in it.
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Which of the following reactions is NOT properly classified?
(A) Synthesis - MgO + CO2 → MgCO3
(8) Decomposition - 2 Fe(OH)3 → Fe2O3 + 3 H2O
(c) Combustion - CO2 + 2 H2O → CH4 + 2 02
(D) Synthesis – 2 Na + Cl2 → 2 NaCl
What is the main purpose of the excretory system?
Question 6 options:
To cause movement of the body
To respond to stimuli
To transport nutrients
To remove waste products
Answer:
To remove waste products
Explanation:
I think
Answer:
to remove waste products
If the hydrogen ion concentration, [H+], in a solution is 2.65 x 10-2 M, what is [OH-]?
Answer:
A
Explanation:
If the hydrogen ion concentration, [H+], in a solution is 2.65 x 10-2 M, then [OH-] will be 3.77x 10-13 M
What is hydrogen ion concentration?
Hydrogen ion concentration is the factor that determines the acidity of water.
Given,
[tex]H^+=2.65*10^-^2[/tex]
To find the concentration of [OH-].
It is known that,
[tex][H^+]*[OH^-]=1*10^-^1^4[/tex]
[tex]OH^-=\frac{1*10^-^1^4}{2.65*10^-^2}[/tex]
[tex]OH^-=3.77*10^-^1^3[/tex]
Thus, the correct answer is 3.77x 10-13 M.
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Which group has the greatest number of valence electrons?
Answer:
chlorine
General Electronic configuration of the group number 2 elements is, . General Electronic configuration of the group number 17 elements is, . From this we conclude that the chlorine is the element which has the greatest number of valence electrons available for bonding. Hence, the correct option is, Chlorine
Explanation:
Explanation:
group 18
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(SCIENCE) HURRY HELP!!
Anabolic steroids are especially dangerous for teenagers whose bones are still growing.
true or false
Answer:
True
Explanation:
Generally makes sense.
How hot is magma?
27 points
Answer:
2200 degrees Fahrenheit
Explanation:
700°C to 1300C where's my points at
The EPA sets national air-quality standards for common air pollutants. The
graph shows the change in the concentrations of these pollutants over time.
Which conclusion do the data in the graph support?
A Concentrations of all pollutants have decreased.
B. Monitoring concentrations of pollutants is too expensive.
O C. Concentrations of all pollutants have increased.
O D. Monitoring concentrations of pollutants has been ineffective.
Answer:
A
Explanation:
Just took the quiz
The irregularity of the chart means that, monitoring concentrations of pollutants has been ineffective.
What is the EPA?The EPA is the environmental protection agency which takes care of the set limits of pollutamts that are released into the environment. The chart shows the monitoring of the concentrations of pollutants over a period of time.
We can see tat the chart is so irregular. The irregularity of the chart means that, monitoring concentrations of pollutants has been ineffective.
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