Answer:
The atomic number stands for the number of protons in an atom of the element.
The number of protons determines the identity of the element,
So the atomic number identifies the element. GOOD LESSONS ♡
If a liquid has a pH of 7 it is what?
Answer:
Neutral
Explanation:
A pH of 7 is neutral. A pH less than 7 is acidic. A pH greater than 7 is basic. The pH scale is logarithmic and as a result, each whole pH value below 7 is ten times more acidic than the next higher value.
Answer:
I believe it is neutral.
Explanation:
Since higher than 7 pH is alkaline, and lower than 7 pH is acidic.
Which of the following excited state electron configurations of C would require the longest wavelength of light to produce?
Question 23 options:
1s22s22p13s1
1s22s22p2
1s22s22p24s1
1s22s22p13p1
Answer:
Explanation:
Well ik its not math for this but for the first one if u add
22+22+13+1 u get 58
then second one 1+22+22+2=47
1+22+22+24+1=70
1+22+22+13+1=59
U notice how that most or some are all going up to 50 except the third one
So that means its 1s22s22p24s1
The longest wavelength is required for the excited state, 1s22s22p13s1.
According to the Bohr model, an atom absorbs energy and moves from a lower energy level to a higher energy level. Also energy is emitted when an electron moves from a higher to a lower energy level.
The lowest energy state of an atom is called the ground state. The excited state is a higher energy level. The smaller the energy difference between the energy levels, the longer the wavelength required for the transition.
Hence, the longest wavelength is required for the excited state, 1s22s22p13s1.
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Unit for mass, volume and density
Answer:
kg, m^3, kg/m^3
Explanation:
the SI units for these are:
mass: kilogram
volume: cubic meter
density: kilogram per cubic meter
How is color a physical change
Answer:Physical changes involve states of matter and energy. No new substance is created during a physical change, although the matter takes a different form. The size, shape, and color of matter may change. Physical changes occur when substances are mixed but don't chemically react.
Explanation:
How many moles of sucrose are dissolved in 500 ml of a 1.5 M sucrose solution?
A. 0.75 moles
B. 750 moles
C. 0.003 moles
D. 333 moles
How long does primary succession take? ty sm ily
A 13.58 g sample of a compound contains 8.67 g of iron, Fe, 1.60 g of phosphorus, P, and oxygen, O. Calculate the empirical
formula for the compound.
Answer:
[tex]Fe_3PO_4[/tex]
Explanation:
To do this, we find the moles of each element. We get around 0.155 moles of Fe, 0.051 moles of P, and 0.206 moles of O. We then divide each one by the smallest one (which is 0.051 moles of P). We then get 3 for Fe, 1 for P, and 4 for O. This correlates to the empirical formula of the compound.
The empirical formula for the compound is [tex]Fe_3PO_4[/tex] if a 13.58 g sample of a compound contains 8.67 g of iron, Fe, 1.60 g of phosphorus, P, and oxygen, O.
What is the empirical formula?
An empirical formula tells us the relative ratios of different atoms in a compound.
We need to calculate the number of moles:
Given data:
Mass of iron - 8.67 g
Mass of phosphorus -1.60 g
Mass of oxygen -3.31 g
Moles of iron - [tex]\frac{mass}{molar \;mass}[/tex]
Moles of iron - [tex]\frac{8.67 g}{56 g/mol}[/tex]
0.15 mole
Moles of phosphorus [tex]-\frac{mass}{molar \;mass}[/tex]
Moles of phosphorus - [tex]\frac{1.60 g}{31 g/mol}[/tex]
0.051 moles
Moles of oxygen -[tex]\frac{mass}{molar \;mass}[/tex]
Moles of oxygen - [tex]\frac{3.31 g}{16 g/mol}[/tex]
0.20 moles
Dividing each mole using the smallest number that is divided by 0.051 moles.
Fe:P:O :: 3:1:4
The empirical formula for the compound is [tex]Fe_3PO_4[/tex].
Learn more about empirical formula here:
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Why is Cobalt (Co) placed before Nickel (Ni) on the Periodic Table of the Elements even though it has a higher average atomic mass than nickel?
Nickel has fewer electrons.
Cobalt has a lower density.
Cobalt was discovered first.
Nickel has one more proton.
Answer: Nickel has one more proton.
Explanation:
The Periodic table orders elements based on their atomic number not by their atomic mass even though this order usually coincides with the atomic masses of the elements. Occasionally however, this is not the case as is proven by Cobalt and Nickel.
The atomic number of an element refers to the number of protons that the element has in its nucleus. Cobalt has 27 protons whilst Nickel has one more proton at 28 which is why it comes after Cobalt.
Answer:
lower density
Explanation:
plz help me the other was blurry I had to repost it
Answer:
HCN+CuSO4->H2SO4+Cu(CN)2
2,1,1,1
1.Add 2 to HCN it then becomes (H=2, C=2, N=2,) (had to add 2 cz on right side you had H2 in H2SO4)
2.1(nothing) cz on both sides we got 1Cu and 1SO4
3.1 cz again we have H2 on both sides and 1SO4 on both sides
4.1 cz we got 1Cu on both sides and 2C 2N on both sides (1st step)
if you know the answer to any of these pls help out I'll give brainiest. also a lot of points
Answer:
5. Divergent boundaries. Divergent boundaries can make underwater ocean trenches.
Explain why according to the kinetic theory of matter there is a problem with the Celsius scale for temperature.
Answer:
The Celsius scale is currently defined by two different temperatures: absolute zero and the triple point of Vienna Standard Mean Ocean Water (VSMOW; specially purified water). Based on this, the relationship between Celsius and Kelvin is as follows: TCelsius=TKelvin−273.15 T Celsius = T Kelvin − 273.15 .
A student was asked to name an element that reacts like chlorine (Cl). Which element should the student name?
Answer:
Bromine (BR2)
Explanation:
Cl2 + Br2 = ClBr
Write the complete ionic equation for the reaction that takes place when aqueous solutions of strontium hydroxide and lithium phosphate are mixed.
Answer : The net ionic equation will be,
[tex]3Sr^{2+}(aq)+2PO_4^{3-}(aq)\rightarrow Sr_3(PO_4)_2(s)[/tex]
Explanation :
In the net ionic equations, we are not include the spectator ions in the equations.
Spectator ions : The ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.
The given balanced ionic equation will be,
[tex]3Sr(OH)_2(aq)+2Li_3PO_4(aq)\rightarrow 6LiOH(aq)+Sr_3(PO_4)_2(s)[/tex]
The ionic equation in separated aqueous solution will be,
[tex]3Sr^{2+}(aq)+6OH^{-}(aq)+6Li^{+}(aq)+2PO_4^{3-}(aq)\rightarrow Sr_3(PO_4)_2(s)+6Li^+(aq)+6OH^{-}(aq)[/tex]
In this equation, [tex]Li^+\text{ and }OH^-[/tex] are the spectator ions.
By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.
The net ionic equation will be,
[tex]3Sr^{2+}(aq)+2PO_4^{3-}(aq)\rightarrow Sr_3(PO_4)_2(s)[/tex]
The complete ionic equation for the reaction between aqueous solutions of strontium hydroxide and lithium phosphate is:
3Sr²⁺(aq) + 6OH¯(aq) + 6Li⁺(aq) + 2PO₄³¯(aq) —> Sr₃(PO₄)₂(s) + 6Li⁺(aq) + 6OH¯(aq)
The complete ionic equation is simply an equation showing all available entities including the spectator ions present in the solution.
With the above information in mind, we shall write the complete ionic equation for reaction between aqueous solutions of strontium hydroxide and lithium phosphate. This can be obtained as follow:
In solution, strontium hydroxide, Sr(OH)₂ and lithium phosphate, Li₃PO₄ will dissociate as follow:
Sr(OH)₂(aq) —> Sr²⁺(aq) + 2OH¯(aq)
Li₃PO₄(aq) —> 3Li⁺(aq) + PO₄³¯(aq)
The reaction will proceed as follow:
Sr(OH)₂(aq) + Li₃PO₄(aq) —>
Sr²⁺(aq) + 2OH¯(aq) + 3Li⁺(aq) + PO₄³¯(aq) —> Sr₃(PO₄)₂(s) + 3Li⁺(aq) + 2OH¯(aq)
Balance the equation by writing 3 before Sr²⁺, 6 before OH¯, 6 before Li⁺ and 2 before PO₄³¯, to obtain the complete ionic equation as shown:
3Sr²⁺(aq) + 6OH¯(aq) + 6Li⁺(aq) + 2PO₄³¯(aq) —> Sr₃(PO₄)₂(s) + 6Li⁺(aq) + 6OH¯(aq)
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Which sample of matter can be separated into different substances by physical means
Answer:
a heterogeneous mixture
Explanation:
an example would be sand and water because it can be filtered which is a physical mean of separation.
Answer:
Heterogeneous mixtures
Explanation:
It is composed of two or more types of matter that can be present in varying amounts and can be separated by physical means. Heterogeneous mixtures vary in composition from point to point; homogeneous mixtures have the same composition from point to point.
The appearance of the surface of a mineral when it reflects light is known as
Answer:
Explanation:
The appearance of the surface of a mineral when it reflects light is known as
Which is NOT a reason why we use the scientific method?
To have something to share with other scientists
To minimize any mistakes and bias.
Because my teacher said so
To maintain good record keeping
Answer:
C. Because my teacher said so
Hope this helps :)
Answer:
Because my teacher said so
Explanation:
You good? lol
Questions and Problems 22 When water is heated, the temperature eventually reaches a constant value and forms a plateau on the graph. What does the plateau indicate?
Answer:
It indicates phase changes: melting then later boiling.
Explanation:
On the heating curve of water, the plateau marks phase change transitions.The temperature remains constant during this period.The first phase change is melting of water.The second phase change is boiling of water to gas.
What do you think makes an atom “neutral or ion”?
Plz help, i will give five stars and brainliest!
Answer: neutral
Explanation: An atom is made up of three major sub-atomic particles namely protons, electrons and neutrons. The electrons form a cloud around the nucleus and are bound to the nucleus by electromagnetic forces.
The density of a gas is 0.88 g/mL. What is the mass of 500.0 mL of this gas?
Answer:
The answer is 440 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume of gas = 500 mL
density = 0.88 g/mL
We have
mass = 0.88 × 500
We have the final answer as
440 gHope this helps you
Where are most of the metals found on the periodic table
Answer:
Left
Explanation:
Metals are located on the left of the periodic table, and nonmetals are located on the upper right. They are separated by a diagonal band of semimetals.
Giant kelp has gas-filled sacs to help it float so it can do what?
collect more sunlight
send signals to other plants
trap small fish
move with the ocean waves
Answer:
collect more sunlight
Answer:
to collect more sunlight
Explanation:
I
go to CALIFORNIA VIRTUAL ACADEMY ONLINE SCHOOL WITH K12
Solve for Density using D=M/V
10. A toy has a mass of 45g and Volume of 10 CM3.What is it's density?
Answer:
4.5 g/cm^3
Explanation:
use formula d=m/v
45/10
d= 4.5 g/cm^3
An element has three isotopes: St-284 (34.60%), St-285 (21.20%), and St-288 (44.20%). What is its average atomic mass?
Answer: I believe that it’ll be 284.45
Explanation:
May have to double check but I’m pretty sure that’s correct sorry if it’s not
write formulas: a) 3 nitrogen atoms, b) 2 phosphorus molecules // help please with these
Explanation:
a)3 N
b)2 P4
hope it will help u
The forces that hold atoms together in an element determine its
F. conductivity
G.melting temperature only
H.hardness only
J.melting temperature and hardness
How many different types of elements are there in acetone C3H6O?
Answer:
3
Explanation:
Answer:
10
Explanation:
Which statement about Earth's core helps explain Earth's magnetic field?
-Earth's core is composed of magnets.
-Earth's core is composed of iron and nickel.
-The outer core is solid,
-The inner core is liquid and moving
Answer:
it should be B. earths core is composed of iron and nickel, if not let me know.
Answer: B. Earth's core is composed of iron and nickel.
Explanation: The inner core is solid so C and D are incorrect and A is incorrect because the core isn't made of magnets so it has to be B.
How many moles are in 1.93x1023 particles of Na3PO4?
Answer:
The answer is 0.32 molesExplanation:
To find the number of moles given the 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
N = 1.93 × 10²³ particles
We have
[tex]n = \frac{1.93 \times {10}^{23} }{6.02 \times {10}^{23 } } \\ = 0.320598006...[/tex]
We have the final answer as
0.32 molesHope this helps you
No. of particles of Na₃PO₄ = 1.93×10²³
We have to find number of moles of the given compound[tex].[/tex]
Number of moles cam be found by using this formula :
[tex]\bigstar\:\boxed{\bf{\purple{n=\dfrac{N}{N_A}}}}[/tex]
n denotes number of molesN denotes number of particles[tex]\sf{N_A}[/tex]denotes avogadro's constantWe know that,
[tex]\bf{N_A}[/tex] = 6.022×10²³★ Calculation :
➠ n = N/[tex]\sf{N_A}[/tex]
➠ n = (1.93×10²³)/(6.022×10²³)
➠ n = 0.32 moles
★ Explore More :
n = weight / Molar massn = volume / 22.4Hope It Helps!How many C atoms are there in a sample of C,H, that contains 6.59 x 1026 H atoms?
A. 1.98 x 1027 C atoms
B. 2.47 x 1026 C atoms
C. 4.94 x 1026 C atoms
D. 3.17 x 1024 C atoms
Answer:
bill gates
Explanation:
Forces are measured in
Newton
Watt
Mass
Grams
Answer:
A
Explanation:
Force can also be described intuitively as a push or a pull. A force has both magnitude and direction, making it a vector quantity. It is measured in the SI unit of newtons and represented by the symbol F.