Explanation:
1one electron and -1 for anions
2 O2- indicates an ion of oxygen having two extra electrons. I.e., since an oxygen atom normally has 8 protons and 8 electrons, this ion has 10 electrons (-10 charge) and 8 protons (+8 charge) giving it a charge of -2 (-10 + 8 = -2).
...
Flame test lab
What are the answers to the last two columns and how do I solve them?
f = 5.08 x 10¹⁴/s
E=3.366 x 10⁻¹⁹ J
Further explanationRadiation energy is absorbed by photons
The energy in one photon can be formulated as
[tex]\large{\boxed{\bold{E\:=\:h\:.\:f}}}[/tex]
Where
h = Planck's constant (6,626.10⁻³⁴ Js)
f = Frequency of electromagnetic waves
f = c / λ
c = speed of light
= 3.10⁸
λ = wavelength
I will give example number 1, and for subsequent numbers, the steps will be the same
For NaNO₃ with λ=590 nm=5.9 x 10⁻⁷m
Frequency(f) :
[tex]\tt f=\dfrac{3.10^8}{5.9\times 10^{-7}}=5.08\times 10^{14}/s[/tex]
Energy(E) :
[tex]\tt E=6.626.10^{-34}\times 5.08\times 10^{14}=3.366\times 10^{-19}~J[/tex]
jumping on a cemented floor is more pain full than a sandy flour,why
Answer:
Is soft
Explanation:
because concrete is hard ash so t hink flour would be safer
In metallic bonding, which of these particles are able to move around freely?
A.) protons
B.) electrons
C.) neutrons
Answer:
Electrons
Explanation:
They mad chillin da electron cloud.
A car is traveling on the freeway going 65 miles/hour. Then it has to slow down
because of traffic. The forces acting on the car are
O only balanced.
O balanced, then unbalanced.
O only unbalanced.
O unbalanced, then balanced.
Answer:
Unbalanced, then balanced OR only unbalanced
Explanation:
At first, the force is unbalanced. This is what is causing the car to move. Then, the car slows down. If the car were to stop, then it would be unbalanced, then balanced. However, if the car never stops, then it would stay unbalanced the whole time. While it is not a specific answer, I hope this helps!
Answer:
the forces action on the car are only balanced hen unbaclanced
Explanation:
A physical property tells how a substance changes into a new substance
Answer:
false
Explanation:
Standard pressure is equal to
1 atm
1 kPa
273 atm
273 kPa
Standard pressure is equal to 1 atm. Therefore option 1 is correct.
Standard pressure is equal to 1 atm, which stands for atmosphere. It is a unit of pressure commonly used in the field of chemistry and physics. Standard pressure is defined as the pressure exerted by a column of mercury in a barometer when the atmospheric conditions are at standard temperature and pressure (STP).
STP is defined as a temperature of 0 degrees Celsius (273.15 Kelvin) and a pressure of 1 atmosphere (1 atm). Therefore, at STP, the standard pressure is equal to 1 atm.
While pressure can be measured in various units such as pascals (Pa), kilopascals (kPa), and atmospheres (atm), the standard pressure is specifically defined as 1 atm.
Know more about STP:
https://brainly.com/question/30778889
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Which of the following is a mixture of substances?
A
copper
B
platinum
C
gold
D
steel
Answer:
the answer is c
b/c contain more than one element
What volume of carbon dioxide is produced when 6.40 g of methane gas, CH4 (g), reacts with excess oxygen? All gases are at 35.0C and 100.0 kPa.
Answer:
V = 10.3 L
Explanation:
Given data:
Mass of methane = 6.40 g
Volume of CO₂ produced = ?
Temperature = 35°C (35+273 = 308 K)
Pressure = 100.0 KPa (100.0/101 = 0.98 atm)
Solution:
Chemical equation:
CH₄ + 2O₂ → CO₂ + 2H₂O
Number of moles of CH₄:
Number of moles = mass/molar mass
Number of moles = 6.40 g/ 16 g/mol
Number of moles = 0.4 mol
Now we will compare the moles of CO₂ with CH₄.
CH₄ : CO₂
1 : 1
0.4 : 0.4
Volume of CO₂:
Formula:
PV = nRT
0.98 atm ×V = 0.4 mol ×0.0821 atm.L/mol.K × 308 K
0.98 atm ×V = 10.11 atm.L
V = 10.11 atm.L /0.98 atm
V = 10.3 L
Lacie is riding her bicycle at a velocity of 5 m/s, her mass is 50kg. What is her kinetic energy?
Answer:
Explanation:
given,
velocity = 5m\s
mass = 50kg
kinetic energy = ?
therefore, we know that,
kinetic energy = 1\2 * mass * velocity^2
= 1\2 * 50* 5 ^ 2
= 1\2 * 50* 25
= 1\2 * 1250
= 625
therefore, kinetic energy is 625
HOPE IT HELPED :D
what is a ball and socket joint?
Answer:
spheroidal joint
Explanation:
Ball-and-socket joint, also called spheroidal joint, in vertebrate anatomy, a joint in which the rounded surface of a bone moves within a depression on another bone, allowing greater freedom of movement than any other kind of joint.
A girl has a weight of 450 N and her feet have a total area of 300Cm2
Answer:
15000N/m²
Explanation:
Given parameters:
Force exerted by the girl = 450N
Area = 300cm²
Unknown:
Pressure exerted by her feet =?
Solution:
Pressure is the force per unit area on a body;
Pressure = [tex]\frac{force }{area}[/tex]
We need to convert the given area to m²;
10000cm² = 1m²
300cm² = [tex]\frac{300}{10000}[/tex] = 0.03m²
Pressure = [tex]\frac{450}{0.03}[/tex] = 15000N/m²
How many Oxygen atoms are present in this
molecular formula: 2CO2?
find ionic compounds
Answer:
1:1
Explanation:
The ratio of metal cationic atom to non-metal anionic atom in the compound is 1:1.
This is an ionic compound.
This is because metal cationic atom has two valence electrons. Non-metal anionic oxygen has six valence electrons Calcium loses two of its valence electrons to be isoelectronic with Ar and this confers a stable configuration to it. Non-metal oxygen atom accepts the electrons and adds 2 to its 6 electrons to become isoelectronic with neon. So, 1 metal cationic atom combines with 1 non-metal anionic atom to form the compound.Which of the following statements is NOT
true about isotopes of the same element?
1. They always have different atomic
weights.
2. They always have different numbers of
protons.
3. They always have the same atomic number.
4. They always have different numbers of neutrons.
Answer:
answer is 2 ............
In winter, soap does not dissolve properly in water. Why?
Answer:
it is because in winter there is a situation of cold means there is less movement in particles of water thats why it happens.
you may also be knowing in particles of matter have constant movement at all time.
50.4g of magnesium metal is added to a graduated cylinder containing 30ml of water. the water level rises to the 85ml mark, from this information, calculate the density of the magnesium metal?
please help fast
I WILL MARK YOU AS BRAINLIEST
Answer:
c
Explanation:
all the atoms must be balanced.
What are two or more substances not chemically combined called? *
Element
Compound
Mixture
Atom
Answer:
✖︎ Mixture← is the right answer answer, so don't choose that....…
THE corrects answer would be MIXTURE
!!!!!!Brainliest??
EXPLANATION
✰1. I take the quiz
✰2. The word already describe it self, mixture is a substance made by mixing other substances together.
✰a mixture is a material made up of two or more different substances which are physically combined. A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions and colloids.
Once magnesium (Mg) gives up electron(s) to become an ion, it will become (Hint - it gives up electrons. What would happen to an onion that gives up layers?) *
A.) a cation that is larger than the original atom
B.) a cation that is smaller than the original atom
C.) an anion that is smaller than the original atom
Answer:
B.) a cation that is smaller than the original atom
Explanation:
When the atoms of an element gains or loses electrons, it becomes charged. This charged atom is called an ION. An ion can either be a CATION or ANION depending on whether the atom loses electrons to become positively charged (cation) or gains electrons to become negatively charged (anion).
In this case, magnesium (Mg) atom gives up or loses electron(s) to become an ion, it will become positively charged and hence called a CATION. However, since it loses electrons in its atom, it becomes SMALLER than the original magnesium atom. This is because the electrons left in the atom becomes more attracted to the nucleus and decreases the ionic radius.
When Earth is tilted on its axis why does it orbit the sun ?
Answer:
Here
Explanation:
Some assume our planet's changing distance from the sun causes the change in the seasons. That's logical, but not the case for Earth. Instead, Earth has seasons because our planet's axis of rotation is tilted at an angle of 23.5 degrees relative to our orbital plane, that is, the plane of Earth's orbit around the sun
The concept of continental drift was developed by Alfred Wegener. Which of the following pieces of evidence does NOT support Wegener's hypothesis?
Group of answer choices
Fossils of the same organisms are found on different continents.
Similar glacial sediments are found in different parts of the world.
The shapes of the continents fit together like pieces of a jigsaw puzzle
Climates at different latitudes are similar to one another.
Answer:
Climates at different latitudes are similar to one another.
Explanation:
The choice that is not a proof of Wegener's concept of concept of continental drift is that climates at different latitudes ae similar to one another.
Wegener did not use climatic evidence to proof continental drift. He did use fossils found on different continents such as the mesosaurus to propose the theory of continental drift. Wegener also used evidence of glacial sediments to justify his claims. He also fitted the earth into a giant puzzle.Answer:
Climates at different latitudes are similar to one another.
what is the air pressure in central texas
Answer:
30.8
Explanation: AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
30.08
i recommend looking at a map for these kinds of questions.
how many atoms are in Tetrachloroauric acid
Answer:
29 i think
Explanation:
Which model shows 6 electrons in the outer shell of the atom?
Answer:
2 has 6 on the outer shell
Which shows the correct order of steps when using wind to generate electricity?
wind turbine blades turn generator → generator changes kinetic energy to electricity → kinetic energy from wind turns blades on wind turbine
kinetic energy from wind turns blades on wind turbine → wind turbine blades turn generator → generator changes kinetic energy to electricity
kinetic energy from wind turns blades on wind turbine → generator changes kinetic energy to electricity → wind turbine blades turn generator
wind turbine blades turn generator → kinetic energy from wind turns blades on wind turbine → generator changes kinetic energy to electricity
Answer:
B.) kinetic energy from wind turns blades on wind turbine → wind turbine blades turn generator → generator changes kinetic energy to electricity
Explanation:
correct on edge
just took the quiz
The correct order of steps when using wind to generate electricity is kinetic energy from wind turns blades on wind turbine → wind turbine blades turn generator → generator changes kinetic energy to electricity. Therefore, option B is correct.
What do you mean by the kinetic energy ?The energy an item has as a result of motion is known as kinetic energy. A force must be applied to an item in order to accelerate it. We must put forth effort in order to apply a force.
Kinetic energy has the following formula: K.E. = 1/2 mv², where m is the object's mass and v is its square velocity.
The kinetic energy is measured in kilograms-meters squared per second squared if the mass is measured in kilogrammes and the velocity is measured in metres per second.
The steps when using wind to generate electricity is kinetic energy from wind turns blades on wind turbine → wind turbine blades turn generator → generator changes kinetic energy to electricity.
Thus, option B is correct.
To learn more about the kinetic energy, follow the link;
https://brainly.com/question/26472013
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Acid rain is an example of _____________ weathering
Answer:
a chemiacal
Explanation:
A teacher performs a flame test lab experiment for various compounds. During the lab, the teacher mislabels one of the solutions. She needs to identify the unknown sample. Explain how the teacher can identify the unknown sample.
Answer: By performing the flame test
Explanation:
The flame test can be performed by the teacher to visually identify the substance in the solution. The metals give a characteristic color on burning. The heat of the flame causes the excitation of the electrons present in the metal ions this leads to release of energy along with the emission of visible wavelength of light. This visible light can be observed by human eye. For example, the copper produces the blue color in flame, barium gives green flame, and sodium gives yellow flame.
ANSWERS PLEASE HELP
i need answers
Answer:
C. is the correct answer
Explanation:
how many grams of chlorine can be produced by the electrolysis of sodium chloride solution
Fe²O³ + 3CO --> 2 Fe + 3CO²
calculate the mass of chlorine that can be formed from 50g of sodium chloride
Answer:
4.3/5. 129
Explanation:
Hope this is correct
an ionic compound is formed when
