Answer:
Explanation:
I need help (yes again)
Answer:
with what?
Explanation:
Round the number 31.257592 to 5 significant figures.
Explanation:
Highlight the first 5 digits. You should highlight 3, 1, 2, 5, and 7 in that order.
Note the next digit after that is a 5, meaning we'll round that 7 up to 8
So 31.257592 becomes 31.258 when we round to five significant figures.
HELP! will mark brainliest if gotten right
Can somebody help me with this??!
What is the name of the following atoms?
An atom with 3 protons and 4 neutrons what is the name?
Answer:
an atom with 3 protons and 4 neutrons is a lithium atom
What are the coefficients that would correctly balance this equation? __Zn+__K2CrO4 > __K + __ZnCrO4
A. 2,1,2,1
B. 1,2,3,1
C. 1,2,1,2
D. 1,1,2,1
Can someone please help
D. 1,1,2,1
Further explanationEqualization of chemical reactions can be done using variables. Steps in equalizing the reaction equation:
1. gives a coefficient on substances involved in the equation of reaction such as a, b, or c, etc. 2. make an equation based on the similarity of the number of atoms where the number of atoms = coefficient × index (subscript) between reactant and product 3. Select the coefficient of the substance with the most complex chemical formula equal to 1Reaction(unbalanced)
Zn+K₂CrO₄ ⇒ K + ZnCrO₄
Give coefficient
aZn+K₂CrO₄ ⇒ bK + cZnCrO₄
Zn, left=a, right=c⇒a=c
K, left=2, right=b⇒b=2
Cr, left=1, right=c⇒c=1⇒a=1
O,left=4,right=4c⇒4c=4⇒c=1
Reaction(balanced0
Zn+K₂CrO₄ ⇒ 2K + ZnCrO₄
Which air is driest? Air Temp 30F Dew-point 29F, Air Temp 77F Dew-point 19F, Air Temp 66F Dew-point 60F, or Air Temp 50F Dew-point 36F
Answer:
Air Temp 77F Dew-point 19F
Explanation:
Quiz
The dew point can be described as the temperature required by the air to be cooled. The driest air will have a higher dew point, therefore, at an air temperature of 66°F and a dew point of 60°F. Therefore, option (C) is correct.
What is dew point?The dew point can be defined as the temperature at which air should be cooled to become saturated with water vapor assuming constant air pressure and water content.
Moisture capacity will decrease below the dew point. Airborne water vapor will condense to form liquid water or dew. Dew develops on the surface and occurs through contact with a cooler surface.
The dew point is called the frost point when the temperature is below the freezing point because frost is produced by deposition rather than a condensation of water.
The humidity also impacts the dew point. The dew point increases when there is higher moisture in the atmosphere. Therefore, the higher dew point refers to less humid air or drier.
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7. Think and discuss: As you move down a group, you will recall that the radius increases.
Why do you think an increase in atomic radius would result in a lower
ionization energy?
8. Think and discuss: As you move across a period, you will recall that the radius decreases.
Why do you think a decrease in atomic radius would result in a greater ionization energy?
9. Predict: Electron affinity (EA) refers to the energy released when an electron is added to
an atom. This release of energy is always expressed as a negative value. The greater the
magnitude of the negative value, the greater the attraction for electrons. (An EA of -100
kJ/mol would indicate a stronger attraction for electrons than an EA of -50 kJ/mol.)
How do you think the size of an atom will affect its ability to attract additional electrons?
Answer:
See explanation
Explanation:
7. As we move down the group more shells are added. The addition of more shells means that the atom becomes larger and the outermost electron is now at greater distance from the nucleus and screening effect becomes very important. This greater screening effect of the inner electron reduces the magnitude of effective nuclear charge on the outermost electron thereby lowering the ionization energy.
8. As we move across the period, the effective nuclear charge increases without a corresponding increase in the number of shells. As a result of this, the outermost electron becomes more tightly bound to the nucleus as the atom becomes smaller and atomic radius decreases causing a rise in the ionization energy from left to right across a period.
9. Actually, the smaller an atom is the greater its electron affinity. The smaller the atom is, the more the outermost shell is drawn closer to the nucleus and this means that the atom is better able to attract electrons to itself.
It is due to the size of atom which varies its force of attraction.
As you move down a group, the atomic radius increases due to addition of more number of shells in an atom. This increase in atomic radius would result in a lower ionization energy because the valance electron is farther from the nucleus and held with weak attractive force so less energy is required to remove it.
While on the other hand, as we move from left to right in a periodic table the atomic radius decreases due to addition of more electrons which shrinks the atom and brought the valance shell closer to the nucleus so it becomes harder to remove an electron because the nucleus held these electrons very tightly.
The size of an atom will affect its ability to attract additional electrons because of its force of attraction. Atoms with small radius has more ability to attract electrons due to higher force of attraction as compared to higher atomic radius atoms.
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The polyatomic ions are those ions which has more than two atoms involved such as the other options than OH^-1 in the question. The OH^-1 ion is the diatomic ion because it has only 2 atoms
______________________________________HOPE IT HELPS!Answer this easy science question for brainiest
First come first served:)
Answer:
The nucleus is a collection of particles called protons, which are positively charged, and neutrons, which are electrically neutral.
Explanation:
Answer:
the person above me is right
hope you do good on your test
Explanation:
How did you organize the tiles in part A? Describe the method that you used.
Answer:
I ordered the tiles from left to right and top to bottom as the numbers kept increasing. The tiles were also organized based on the color and shape that they were. The tiles with the same color and shape were arranged in the same column.
Explanation:
In the modern periodic table, the elements are listed in order of increasing atomic number and elements having similar chemical properties naturally line up in the same column (group).
Based on the quantity as well as shape of each tile, arrange them in the table.
What is tile?The majority of the time, tiles are thin, square usually rectangular coverings made of durable materials like ceramic, stone, metals, baked clay, or perhaps even glass. They are typically put in place inside an arrangement to cover surfaces including tabletops, borders, floors, walls, and roofs.
In another definition, a tile is indeed a building material or a comparable object, such the rectangular game counters. The word comes taken from the Latin phrase tegula, which means a roof tile made of heated clay. Based on the quantity as well as shape of each tile, arrange them in the table.
Therefore, based on the quantity as well as shape of each tile, arrange them in the table.
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Rising greenhouse gases. Climate change. Rising energy costs. Declining fossil fuels reserves. With the arguments against fossil fuels continuing to pile up it is no wonder people have latched onto nuclear power as an attractive solution....
1. What is nuclear fission? ________________________________________________________________________________
2. What is nuclear fusion? ________________________________________________________________________________
3. What happens when the energy from splitting an atom is released all at once? _____________________________________
4. What element is used in nuclear power plants as fuel? ________________________________________________________
5. What dangerous byproduct is produced by nuclear power plants? _______________________________________________
6. Describe THREE benefits of using nuclear power: ___________________________________________________________, _____________________________________________________, and __________________________________________
7. What is the function of the cooling towers of the nuclear reactor shown below? _____________________________________
Answer:
Nuclear Fission is a nuclear reaction or a Radioactive decay progress in which the necleus of an atom splits into two or more smaller, lighter neclei
An atom with 4 protons and 4 neutrons Is called?
Answer:
i'm pretty sure it's beryllium
Explanation:
Answer:
Beryllium
Explanation:
the atomic number is equal to protons
*blank* carry blood away from the heart, while *blank* carry blood back to the heart.
fill in the blank spaces...
A. capillaries
B. arteries
C. Blood vessels
D. Veins
Answer:
i think its C im not so sure
Explanation:
nrjdkfkzhsugogo
If you wanted to change the polarity of hydrogen bromide (HBr) by substituting the bromine by a different atom. Which atom would increase the polarity of the molecule?
Answer:
Chlorine
Explanation:
The Polarity of an atom is characterized as the dipole to dipole intermolecular forces between the slightly positively-charged end of one molecule to the negative end of another or the same molecule. Thus, the 'chlorine' atom would help in enhancing the polarity of hydrogen bromide(HBr) with 3.16 electronegativity as we know, the electronegativity increases if we move upwards in the periodic table.
Why would farmers in the United States be especially concerned about a decrease in ground water?
Answer:
yes probably
Explanation:
the decrease would affect the plants growing in the ground cause there is no access water they can get
What was the carbon cycle on the prairie like?
Answer:
Explanation:
Carbon cycle explains the movement of carbon between the earth's biosphere, geosphere, hydrosphere and atmosphere. ... Carbon atoms are then released as carbon dioxide when organisms respire. The formation of fossil fuels and sedimentary rocks contribute to the carbon cycle for very long periods.
Explain how Earth is heated through radiation
Answer:
Radiation happens when heat moves as energy waves, called infrared waves, directly from its source to something else. This is how the heat from the Sun gets to Earth. In fact, all hot things radiate heat to cooler things. When the heat waves hits the cooler thing, they make the molecules of the cooler object speed up.
Copernicus challenged the way in which people of his time thought about the solar system. How did Copernicus describe the motion of the sun?
A.The sun is stationary.
B.The sun revolves around Earth.
C.The sun moves in an elliptical orbit.
D.The sun moves in a straight line through space.
Answer:
A. The sun is stationary and we rotate around it.
Hope This Helps!
Answer:
A
Explanation:
the sun is stationary
Can someone tell me about kinetic, potential, and gravitational energy?
Answer:
the internet can teach you alot about all 3 things
Explanation:
Answer:
if you go on YT and search kinetic, potential, and gravitational energy their will be a bill nye vid that is very informational on the topic at hand!!!
Explanation:
hope this helps!!
How many moles of gas does it take to occupy 120 liters at a pressure of 2.3 atmospheres and a temperature of 340 K?
Answer:
9.9 moles
Explanation:
What we know:
P = 2.3 atm V = 120 L
R= .0821 L atm/K mol T= 340 K
What we're looking for: n = ?
2.3 atm ( 120 L) = n (.0821 L atm/K mol) (340 K)
2.3 ( 120 ) = n (.0821 / mol) (340)
276 = n (27.914 / mol )
9.9 = n / mol
9.9 mol = n
There are several differences between chemical and physical changes. Which process is a sign of a chemical change? A. Rotting potato gives all of bad smell
B. Melting block of ice leaves a large puddle
C. A cloud quickly changes shape when blown by wind
D. A plaster statue breaks when it falls into the floor. PLEASE HELP
Answer:
A. a rotten potato gives all of bad smell
Explanation:
B,C,D are all physical changes because we can reverse them back.we can cool the water back to make ice. if the wind passes again we can randomly get the same cloud shape in c. and in d we can make that statue again. but in A can we reverse the rotting process ? ( the enzyme reaction) no we cant because it is a chemical reaction it gives a bad smell because of the chemical changes occuring in it.
hope this helps
14. Which of the following groups is most at risk for developing this disease?
a) children born to mothers with dark skin, living far from the equator
b) adults with dark skin who live close to the equator
c) children born to mothers with light skin who live close to the equator
Answer: c
Explanation: built different
When would it be appropriate to use a model instead of a controlled experiment
a
is the correct answer
Determine the pressure of a 6.4L sample of oxygen gas at 300K and 100KPa, after the gas is compressed to 2.40L at 900K.
The pressure : 800 kPa
Further explanationBoyle's law and Gay Lussac's law
[tex]\tt \dfrac{P_1.V_1}{T_1}=\dfrac{P_2.V_2}{T_2}[/tex]
P1 = initial gas pressure (N/m² or Pa)
V1 = initial gas volume (m³)
P2 = gas end pressure
V2 = the final volume of gas
T1 = initial gas temperature (K)
T2 = gas end temperature
The pressure after the gas is compressed :
[tex]\tt \dfrac{100\times 6.4}{300}=\dfrac{P_2\times 2.4}{900}\\\\P_2=800~KPa[/tex]
Which chemical equation follows the law of conservation of mass?
A. 2NaOH + H2S04 - Na2SO4 + H20
B. NaOH+H2SO4 - Na2SO4 + 2H20
C. 2NaOH + H2S04 - Na2SO4 + 2H20
D. NaOH + H2SO4 - Na2SO4+H20
Answer:
C. 2NaOH + H₂SO₄ -> Na₂SO₄ + 2H₂O
Explanation:
Simply count up the elements in the reactants and the products, then compare.
Reactants:
2 Na = 2 Na
2 O + 4 O = 6 O
2 H + 2 H = 4 H
Products:
2 Na = 2 Na
4 O + 2 O = 6 O
2 x H₂ = 4 H
Because the constituent elements in the reactants = products, the law of conservation of mass is preserved. You can check the other 3 options to see that they will not equal each other.
Don't forget to distribute the coefficients to every part of the formula; on the other hand, subscripts only apply to the element they are under. If a coefficient needs to be multiplied to an element with a subscript, use the subscript instead of 1 (1 is when there are no subscripts).
The ____ energy of an object increases with its height.
Thermal
Chemical potential
Gravitational Potential
kinetic
Answer:
chemichal potential
Explanation:
Answer:
Gravitational Potential
How much energy is required to raise the temperature of 0.2 kg of aluminum from 15°C to 18°C? (Refer to table of specific heat values.)
The amount of energy which is required to raise the temperature of 0.2 kg of aluminum from 15°C to 18°C is 49,545 J.
How do we calculate absorbed energy?Amount of energy absorbed by any material will be calculated by using the below equation:
Q = mcΔT, where
m = mass of aluminum = 0.2 kg
c = specific heat of aluminum = 897 J/kg.K
ΔT = change in temperature = 18 - 15 = 3°C = 276.15 K
On putting these value on the above equation, we get
Q = (0.2)(897)(276.17) = 49,544.89 = 49,545 J
Hence required amount of energy is 49,545 J.
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Water is the only substance that can dissolve polar solutes. True or False?
Answer:
false!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Explanation:
I need help ASAP ... please
Answer:
help with what?
