Answer:
A. People with perfect understanding of science
What is responsible for the blue sky?
Answer:
Gasses and particles in Earth's atmosphere scatter sunlight in all directions. Blue light is scattered more than other colors because it travels as shorter smaller waves. This it why we see a blue sky most of the time
Explanation:
I looked it up
Answer:
sun shine
Explanation:
A clear cloudless day-time sky is blue because molecules in the air scatter blue light from the sun more than they scatter red light. When we look towards the sun at sunset, we see red and orange colours because the blue light has been scattered out and away from the line of sight.
The mass of a mole of a substance can be found using the ____ of the substance.
Answer:
mass
Explanation:
Answer:
mass mass mass mass mass
oxidation number of lead is PbO2
Answer:
+4
Explanation:
Pedro is heating sugar to make caramel for an investigation. As the sugar is heating, he is looking for evidence of a chemical change. Select the observation that Pedro made about the chemical change.
Answer:
The sugar atoms formed new atoms after caramelization.
Explanation:
When sugar is heated to a certain temperature, it becomes caramel. Te formation of caramel from the sugar is a chemical process.
In the context, Pedro is doing an investigation by heating sugar to make caramel. Burning of the sugar crystal is a chemical change as different chemicals are present in both. The caramel formed cannot be revered back to sugar crystal, this also proves the chemical change of caramelization of sugar cubes. Sugar consists of carbon, oxygen and hydrogen atoms. It reacts with atmospheric oxygen atoms to form new groups of atoms and forms caramel.
How does the atomic radius of an element is related to its metallic character
Answer:
The large the atomic radius the more the metallic character of elements
Explanation:
The atomic radius is related to the metallic character in a way that the larger the atomic radius, the more metallic a body becomes.
Therefore, as we go down a group, metallic character increases.
Metallic character relies on the ability and willingness of an atom to share its valence electrons. As the size of an atom becomes large, the more metallic it is and the more its metallic character. In some other cases this character is known as electropositivity.When a substance is changed from a solid to liquid energy is_ _ _ _ d *81 points*
Answer:
That change is known as melting.
Explanation:
I am not sure what you are asking. I hope this helps!
Help pls!!! Thnk you
Answer:
521 nm
Explanation:
From the question given above, the following data were obtained:
Frequency (v) = 5.76×10¹⁴ s¯¹.
Wavelength (λ) =.?
RECALL: velocity (c) of light = 3×10⁸ m/s
Thus, we can obtain the wavelength of the green light by using the following formula:
c = vλ
3×10⁸ = 5.76×10¹⁴ × λ
Divide both side by 5.76×10¹⁴
λ = 3×10⁸ / 5.76×10¹⁴
λ = 5.21×10¯⁷ m
Next, we shall convert 5.21×10¯⁷ m to nanometer (nm). This can be obtained as follow:
1 m = 1×10⁹ nm
Therefore,
5.21×10¯⁷ m = 5.21×10¯⁷ m × 1×10⁹ nm / 1 m
5.21×10¯⁷ m = 521 nm
Thus, 5.21×10¯⁷ m is equivalent to 521 nm
Therefore, the wavelength (λ) of the photon of the green light is 521 nm.
Answer:
the wavelength (λ) of the photon of the green light is 521 nm.
Why do flowers have brightly-coloured petals
Answer:
Petals are modified leaves that surround the reproductive parts of flowers. They are often brightly colored or unusually shaped to attract pollinators. Together, all of the petals of a flower are called corolla.
What is the metallic ion in the compound CuCl2?
Answer:
Cu2+
Srry if I didnt help..
The metallic ion in the compound CuCl₂ is copper (Cu).
What is the metallic ion in the compound CuCl2?CuCl₂ is a combination of copper (Cu) and chlorine (Cl) ions. In this compound, copper has a positive charge of 2, and chlorine has a negative charge of 1. Copper is a type of metal that can make different charged particles (called ions) depending on what it combines with and how it reacts.
In CuCl₂, the copper ion has a positive charge of 2. This means that it has given away two electrons and has an oxidation state of +2. The chlorine ions have a negative charge of -1 because they have taken in one electron. This shows that they have an oxidation state of -1.
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Which of the following best explains why the atomic mass on the Periodic Table is a decimal.
his table shows the mass and volume of four different objects.
A two-column table with 4 rows. The first column titled objects has entries W, X, Y, Z. The second column titled Measurements has entries Mass: 16 grams Volume: 84 centimeters cubed in the first cell, Mass: 12 grams Volume: 5 centimeters cubed in the second cell, Mass: 4 grams Volume: 6 centimeters cubed in the third cell, Mass: 408 grams Volume: 216 centimeters cubed in the fourth cell.
Which ranks the objects from most to least dense?
X, Y, W, Z
X, Z, Y, W
W, Y, Z, X
Z, Y, X, W
Ranks the objects from most to least dense : X,Z,Y,W
Further explanationGiven
Object W : m=16 g, V=84 cm³
Object X : m=12 g, V= 5 cm³
Object Y : m=4 g, V= 6 cm³
Object Z : m=408 g g, V= 216 cm³
Required
Density
Solution
Density formula:
[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]
ρ = density
m = mass
v = volume
1. Object W
[tex]\tt \rho=\dfrac{16}{84}=0.19[/tex]
2. Object X
[tex]\tt \rho=\dfrac{12}{5}=2.4[/tex]
3. Object Y
[tex]\tt \rho=\dfrac{4}{6}=0.67[/tex]
4. Object Z
[tex]\tt \rho=\dfrac{408}{216}=1.89[/tex]
From most to least dense : X,Z,Y,W
what is the mass of 1.506 x 10^24 atoms of Argon
Answer:
99.90g
Explanation:
1.506 x 10^24atoms × [tex]\frac{1mol}{6.022*10^{23}atoms}[/tex] × [tex]\frac{39.948grams}{1mol}[/tex] = 99.90grams
multiply the atom by constant and by its molar mass
1.506 x 10²⁴ atoms of argons gas is two moles. One mole of argon weighs 35.9 g. Thus mass of two moles of argon is 89.9 g.
What is argon?Argon is 18th element in periodic table. It is placed in 18 the group and it is a noble gas or inert gas with completely filled orbitals. The group members of argon are neon, krypton, xenon and radon.
One mole of every substance contains 6.022 × 10²³ atoms. This number is called Avogadro number. Therefore, one mole of every element contains Avogadro number of atoms. The atomic mass of an element is the mass of one mole of that element.
Mass of one mole of argon is 35.9 g. Thus, it contains 6.022 × 10²³ atoms. Hence, the number of moles that contains 1.506 x 10²⁴ atoms is calculated as follows:
no.of moles = 1.506 x 10²⁴ / 6.022 × 10²³
= 2.5 moles.
The mass of 2.5 moles of argon is 2.5 × 35.9 = 89.9 g. Hence, the mass of 1.506 x 10²⁴ argon atoms is 89.9 g.
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please help out correct answers only
Answer:
Molecular formula = SF₆
Empirical formula is SF₆
Explanation:
Percentage of sulfur = 21.95%
Percentage of fluorine = 78.03%
Molar mass of compound = 146.1 g/mol
Empirical formula = ?
Molecular formula = ?
Solution:
Number of gram atoms of S = 21.95 / 32= 0.69
Number of gram atoms of F = 78.03 / 19 = 4.107
Atomic ratio:
S : F
0.69/0.69 : 4.107/0.69
1 : 6
S : F = 1:6
Empirical formula is SF₆
Molecular formula:
Molecular formula = n (empirical formula)
n = molar mass of compound / empirical formula mass
Empirical formula mass :
32 + 19×6 = 146
n = 146.1 / 146
n = 1
Molecular formula = n (empirical formula)
Molecular formula = 1 (SF₆)
Molecular formula = SF₆
NEED HELP ASAP! Newton's Law of Gravity says that any the effect of gravity between two objects depends on what two factors?
A: inductance and capacitance
B: Newtons and kilograms.
C: distance and mass.
D:joules and kelvins.
(will mark as brainiest)
(don't answer if you don't know please).
Answer:
C. Distance and mass.
Explanation:
Objects that have greater mass have more force of gravity between them.
What is the molar mass of NaOCI?
Answer:
the molar mass of NaOCl is 74.5g
Calculate the H+ ion concentration in a 8.8 x 10-4 M Ca(OH)2
solution.
form the molar concentration of the Ca(OH)2 which is a base we can deduct the pOH
pOH=-lg[OH-]
[OH-]=8.8 x 10-4 M
pOH=4
pH=14-pOH
pH=10
-lg[H+]=10
[H+]=10^-10
The concentration of Hydrogen ion [H⁺] in 8.8×10¯⁴ M Ca(OH)₂ is 5.68×10¯¹² M
The concentration of Hydrogen ion [H⁺] in a solution talks about the acidicity the solution. Thus, we can obtain the concentration of Hydrogen ion [H⁺] in 8.8×10¯⁴ M Ca(OH)₂ solution as illustrated below:
Step 1:Data obtained from the question
Concentration of Ca(OH)₂ = 8.8×10¯⁴ M
Concentration of Hydrogen ion [H⁺] =..?
Step 2:Determination of the concentration of Hydroxide ion [OH¯]
Concentration of Ca(OH)₂ = 8.8×10¯⁴ M
Concentration of Hydroxide ion [OH¯] =?
Ca(OH)₂ (aq)⇄Ca²⁺ (aq) + 2OH¯(aq)
From the balanced equation above,
1 mole Ca(OH)₂ produced 2 moles of OH¯.
Therefore, 8.8×10¯⁴ M Ca(OH)₂ will produce = 8.8×10¯⁴ × 2 = 1.76×10¯³ M
Thus, the Concentration of Hydroxide ion [OH¯] is 1.76×10¯³ M
Step 3:Determination of concentration of Hydrogen ion [H⁺]. Concentration of Hydroxide ion [OH¯] = 1.76×10¯³ M
Concentration of Hydrogen ion [H⁺] =..?[tex]H^{+} * OH^{-} = 1*10^{-14}\\H^{+} * 1.76^{-3} = 1*10^{-14}[/tex]
Divide both side by 1.76×10¯³
[tex]H^{+} = \frac{1*10^{-14} }{1.76*10^{-3}}\\[/tex]
[H⁺] = 5.68×10¯¹² M
Therefore, the concentration of Hydrogen ion [H⁺] in the solution is 5.68×10¯¹² M
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Why the graph isn't just a single sloped straight line.
Answer:
the equation could have mulitplication and square roots which may change the function of the line
How would you define speed and the formula to find speed?
Answer:
Speed is how fast you cover a certain distance
[tex]Speed=\frac{Distance}{time}[/tex]
what are the difference between an animal cell and plant cell
Answer:
ANIMAL CELL
Animal cells are generally small in size.
They don't have a cell wall
Except the protozoan Euglena, no animal cell possesses plastids.
Vacuoles in animal cells are many, small and temporary.
Animal cells have a single highly complex and prominent Golgi apparatus.
Animal cells have centrosome and centrioles.
PLANT CELL
Plant cells are larger than animal cells.
The plasma membrane of plant cells is surrounded by a rigid cell wall of cellulose.
They have Plastids
Most mature plant cells have a permanent and large central sap vacuole.
Plant cells have many simpler units of Golgi apparatus, called dictyosomes.
Plant cells lack centrosome and centrioles.
Hope this helps!
Answer: Differences between animal and plant cells :
Animal cell :- Animal cells are generally small in size. Cell wall is absent. Except the protozoan Euglena, no animal cell possesses plastids. Vacuoles in animal cells are many, small and temporary. Animal cells have a single highly complex and prominent Golgi apparatus. Animal cells have centrosome and centrioles. Plant cell :- Plant cells are larger than animal cells. The plasma membrane of plant cells is surrounded by a rigid cell wall of cellulose. Plastids are present. Most mature plant cells have a permanent and large central sap vacuole. Plant cells have many simpler units of Golgi apparatus, called dictyosomes. Plant cells lack centrosome and centrioles.
Explanation:
50 POINTS..!!! NEED RHE ANSWER ASAP..!!! consider the original wave at the top of the illustration. compare the original wave to the other four. which wave represents a wave with the same volume but a lower pitch?
a). wave a
b). wave b
c). wave c
d). wave d
Answer:
my best guess is b
Explanation:
typically the lower the pitch the longer the wave line inbetween the inclines are
please answer; i’ll give brain
Answer:
the answer to this question is option A mark me as brainliest
Is the singular possessive noun of walrus is walrus’s?
Answer:
Yes
Explanation:
Answer:the plural of walrus is walruses
Explanation:
hhhhhhhhhhhheeeeeeeelpppppp
Answer:
Solar photons
Hope this helps :)
Describe in three sentences how Ca (Calcium) can get a positive two charge?
A process by which softer, less weather-resistant rocks wear away and leave harder, more weather-resistant rocks behind is called a. differential weathering. c. chemical weathering. b. mechanical weathering. d. ice wedging.
Answer:
geosphere
Explanation:
Answer:
differential weathering.
Explanation:
What energy transformation occurs when a person is running
Answer:
Kinetic Energy (Hope This Helps)
Explanation:
(Brainliest)
Answer:
Chemical energy to kinetic energy. (Arguably heat energy (thermal) because of respiration)
38
Both ionization and dissociation produce ions of the solute in solution.
How do the two processes differ? Write two differences. *
Answer:
Detail is given below
Explanation:
Differences:
Ionization involves the formation of ions while in dissociation substance are break into atoms, ions or molecules.
In ionization atoms and molecules gain positive or negative charge.
While in dissociation positive and negative ions are not essentially formed substance could be break into neutral small particles.
Ionization occur in covalent compounds while dissociation occur in ionic compound.
Ionization example:
Cl + e⁻ → Cl⁻
Dissociation example:
NaCl → Na⁺ + Cl⁻
Here sodium and chloride ions are formed but in sodium chloride these ions were already present.
Another example:
N₂O₄ → 2NO₂
the outer skin makes the surfboard more expensive. Suggest two reasons why an outer skin is added to the polystyerene core.
(2 marks)
Answer:
It helps it not to break or crack. It is like an outer shell to protect it.
Explanation:
How many moles of sulfur trioxide are formed from 3 moles of oxygen using the given
balanced equation?
2 SO. +0,- 2 so.
Answer:
6 moles of SO₃ formed.
Explanation:
Given data:
Number of moles of SO₃ formed = ?
Number of moles of oxygen react = 3 mol
Solution:
Chemical equation;
2SO₂+ O₂ → 2SO₃
now we will compare the moles of oxygen and sulfur trioxide.
O₂ : SO₃
1 : 2
3 : 2/1×3 = 6 moles
Thus, six moles of SO₃ will formed.
Which formula represents a compound containing three atoms? A) HNO3 B)H2O C)LIF D)ZnSO4
Answer:
c actual contains three atom