Answer:
r the first one was the first one was the first one was the first one was the first one was w and I have to say it was a great place 33rd and I have to say it was a great place for him ccjfjtjtjgjcfnfjrjru and I think he's a good team and I think he's
Explanation:
d the same thing as the one that I was a great place for me j CVAnswer:
0 stuff
Just Search it up if sus
An atom of element Be has four protons, four electrons, and five neutrons. Which element below could be an isotope of this atom? Sodium-10 beryllium-10 boron-9 carbon-9
Answer:
beryllium-10
Explanation:
An isotope is an atom of the same element that has a different number of neutrons.
This means that an isotope of beryllium (Be) would have to be beryllium as well.
The number 10 references the fact that it has four protons and six neutrons:
4 protons + 6 neutrons = 10
While usually the element has 5 neutrons, so it is beryllium-9.
The element that could be an isotope of the atom with four protons, four electrons, and five neutrons is boron-9 and the correct option is option 3.
Isotopes are atoms of the same element that have a different number of neutrons. In this case, the given atom of beryllium has five neutrons, so an isotope of beryllium would have a different number of neutrons.
Among the options provided, boron-9 has a different number of neutrons (four) and is therefore a possible isotope of beryllium. Sodium-10, beryllium-10, and carbon-9 have different numbers of protons and are different elements.
Thus, the ideal selection is option 3.
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How many grams of potassium oxide would be needed to produce 5.00 g of potassium nitrate (KNO3) ?
Answer:
Mass = 2.355 g
Explanation:
Given data:
Mass of K₂O needed = ?
Mass of KNO₃ produced = 5.00 g
Solution:
Solution:
K₂O + 2HNO₃ → 2KNO₃ + H₂O
Number of moles of KNO₃:
Number of moles = mass/molar mass
Number of moles = 5.00 g/ 101.1 g/mol
Number of moles = 0.05 mol
now we will compare the moles of KNO₃ and K₂O.
KNO₃ : K₂O
2 : 1
0.05 : 1/2×0.05 = 0.025 mol
Mass of potassium oxide needed in gram:
Mass = number of moles × molar mass
Mass = 0.025 mol × 94.2 g/mol
Mass = 2.355 g
33. A basketball bounces on the gym floor nine times and finally comes to a rest. Which of these BEST explains why the
basketball rises to a lower height each time it bounces?
A. Gravity increases as the basketball bounces.
B. The floor adds energy to the bouncing basketball.
C. Energy is transferred from the basketball to the floor.
D. The air inside the basketball is heavier than the surrounding air.
is the sun a star?explain
Answer:
The Sun is a star. There are lots of stars, but the Sun is the closest one to Earth. It is the center of our solar system. The Sun is a hot ball of glowing gases.
Answer:
the sun is a star
Explanation:
Our Sun is an ordinary star, just one among hundreds of billions of stars in the Milky Way Galaxy. As the only star we can observe in detail, it provides a basis for our understanding of all stars. The Sun is composed almost entirely of hydrogen and helium gas.
What is the total mass shown on the triple beam balance scale?
A.163.5 g
B.253.5 g
C.263.5 g
D.283.5 g
Answer:
263.5
Explanation:
Add everything
Which sentence in the picture is true please help me with this
Answer:
C (top to bottom) or the 3rd one
Explanation:
How many atoms of N are in 0.755 mol of N2? ( mole conversion)
The number of atoms N in 0.755 mol of N₂ : 9.09 x 10²³
Further explanationThe mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
moles of N in 0.755 mol N₂ :
[tex]\tt 2\times 0.755=1.51~moles[/tex]
The number of atoms N :
[tex]\tt 1.51\times 6.02\times 10^{23}=9.09\times 10^{23}~atoms[/tex]
Iron(II) sulfate and calcium chloride
Answer: [tex]FeSO_4+CaCl_2\rightarrow CaSO_4+FeCl_2[/tex]
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
A double displacement reaction in which one of the product is formed as a solid is called as precipitation reaction.
The balanced chemical equation is:
[tex]FeSO_4+CaCl_2\rightarrow CaSO_4+FeCl_2[/tex]
Read the article and use the information to complete this task: Fuel Cell Vehicles Construct an argument for or against the immediate introduction of fuel-cell cars. Include likely points of objection from those with opposing views (such as environmental and economic impacts) as well as counterarguments to those objections.
Answer:
It causes no pollution.
It is less durable and very expensive.
Explanation:
Fuel Cell Vehicles are the vehicles which moves by using hydrogen gas to power an electric motor as compared to conventional vehicles that moves by burning of fossil fuels. There is no bad effect on the environment because Fuel Cell Vehicles cause no pollution like conventional vehicles. Due to less durable and very expensive, Fuel Cell Vehicles can't take the place of conventional vehicles because its higher price which is not affordable for the people.
Answer:
fuel cost and availability
vehicle cost and availability
domestic fuel sources
pollution
onboard fuel storage
fuel cell performance
An object's shadow was observed and measured at different times of the day. The data was recorded in the chart below. How does the data provide evidence that the sun is changing position in the sky throughout the day?
Answer:
Yes, the data provides evidence.
Explanation:
The data provides evidence of changing in length of object's shadow at different times of the day which indicates that the sun is changing position in the sky throughout the day. At the sunrise and sunset, the length of shadow is highest as compared to other times of the day while on the other hand, at the afternoon when the sun is present on the head, the shadow's length is the lowest. So we can say that the sun is changing position in the sky throughout the day.
A destructive change that is not caused by people
A. Climate
B. Natural disaster
C. Severe weather
D. Latitude
Answer:
Natural Disaster
Explanation:
Answer:
B and C
Explanation:
Natural disasters can be very destructive along with severe weather. Both mixed would be quite bad for us.
What are the 10 metals?
Answer: Metals:-
1) Gold
2) Silver
3) Iron
4) Copper
5) Nickel
6) Aluminum
7)Mercury( Liquid metal)
8) Titanium
9) Radium
10) Californium
Non-metals:-
1) Diamond
2) Sulphur
3) Graphite
4) Carbon
5) Iodine
6) Tincture
7) Bromine (liquid non-metal)
8) Phosphorus
9) Silicon
10) Boron
Hope this helps..... Stay safe and have a Merry Christmas!!!!!!!! :D
Explanation:
when 0.15 moles of sodium reacts with 0.30 moles of oxygen what is the moles of the product formed when one reagents is used in excess
Answer:
0.075 moles of product formed.
Explanation:
Given data:
Number of moles of oxygen = 0.30 mol
Number of moles of oxygen = 0.15 mol
Number of moles of product formed = ?
Solution:
Chemical equation:
4Na + O₂ → 2Na₂O
Now we will compare the moles of Na₂O with oxygen and sodium.
Na : Na₂O
4 : 2
0.15 : 2/4×0.15 = 0.075 mol
O₂ : Na₂O
1 : 2
0.30 : 2/1×0.30 = 0.6 mol
Less number of moles of Na₂O are produced by sodium thus it will limit the yield of Na₂O and act as limiting reactant while oxygen is in excess.
What is the wavelength of a photon of light with an energy of 5.2 eV? Please answer in nm.
1 eV = 1.60 x 10-19 J
Speed of light -3.0 x 108 m/s
Planck's constant = 6.626 x 10-34 Js
Please help Please Help
Answer:
1) false
2) true
3) true
4) false
5) false. I think
6) false
Which particle has a postive charge? neutron, electron, proton or beta particle
Answer:
Proton I believe
Explanation:
Finely ground nickel (II) hydroxide is placed in a beaker of water. It sinks to the bottom of the beaker and remains unchanged. An aqueous solution of hydrochloric acid is then added to the beaker and the Ni(OH)2 disappears. Which reaction best describes what occurred in the beaker?
Your answer:
Ni(OH)2 (s) + HCl (aq) → NiO (aq) + H2 (g) + HCl (aq)
Ni(OH)2 (s) + 2 HCl (aq) → NiCl2 (aq) + 2 H2O (l)
Ni(OH)2 (s) + 2 H2O (l) → NiCl2 (aq) + 2 H2O (l)
Ni(OH)2 (s) + 2 H2O (l) → NiCl2 (aq) + 3 H2O (l) + O2 (g)
Explanation:
Acid-base reaction will give salt and water.
The 2nd option is correct.
The chemical equation Ni(OH)₂ (s) + 2 HCl (aq) → NiCl₂(aq) + 2 H₂O (l) represents what happened in the beaker as acid and base reaction gives salt and water.
What is chemical equation?
Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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How many aluminum atoms are in 3.85 mol?
Answer: 4.00
Explanation:
which molecule in plants cells first captures the radiant energy from sunlight?
A. glucose
B. carbon dixide
C.chlorophyll
D.adenosine triphosphate
Answer:
c tell me if im wrong:)
Explanation:
:)
The molecule in plants cells first captures the radiant energy from sunlight is chlorophyll. The correct option is C.
What is chlorophyll?Chlorophyll, any of the pigments that participate in photosynthesis, the process by which light energy is converted to chemical energy through the synthesis of organic compounds.
Almost all photosynthetic organisms, including green plants, cyanobacteria, and algae, contain chlorophyll.
Chlorophyll is the name given to the green pigment used by plants to produce food during the photosynthesis process.
Chlorophyll is essential for photosynthesis, which allows plants to absorb light energy. Chlorophyll molecules are arranged in and around photosystems embedded in chloroplast thylakoid membranes.
Chlorophyll is the molecule in plant cells that first captures the radiant energy from sunlight.
Thus, the correct option is C.
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calculate the volume occupied by 0.500 mol of co2 at a pressure of 150 and temperature if 19 degrees celsius
Answer:
i think its A sorry if im wrong
Explanation:
The inner core of Earth is solid iron and nickel. Iron and nickel will melt at temperatures around 1,500°C. The average
temperature of the inner core is about 5,000°C. Why then, does the inner core not melt and become a liquid?
O A. The inner core isn't hot enough to melt iron or nickel.
OB. It is impossible to melt iron or nickel because they are metals.
C. The extreme pressure at the center of the Earth keeps the core solid.
D. The outer core is so cold that it keeps the inner core solid.
Answer:
maybe C?
Explanation:
srry if wrong
hope it helps
Answer: C.
Explanation:
A. Is out because we know that it can melt iron and nickel B. Is out because metal is most definitely meltable
And for D. Between 8,132° and 9,932° Fahrenheit Is the temperature of the outer core
(will mark brainliest) pls don’t scam - due today! these are my last points please answer
Answer:
A
Explanation:
It's know things
Answer:
Gregor mendel
Explanation:
He is considered by most the father of gentics
8. How are convection currents in the mantle (geosphere) and in the oceans (hydrosphere) similar? How are they different? Answer:
Answer:
Mantle convection is the slow creeping motion of Earth's rocky mantle caused by convection currents carrying heat from the interior of the earth to the surface while convection current in ocean in; Solar radiation affects the oceans: warm water from the Equatortends to circulate toward the poles, while cold polar water heads towards the Equator. The surface currents are initially dictated by surface wind conditions. The trade winds blow westward in the tropics, and the westerlies blow eastward at mid-latitudes. This wind pattern applies a stress to the subtropical ocean surface with negative curl across the northern hemisphere, and the reverse across the Southern Hemisphere. The resulting Sverdrup transport is equator ward.Because of conservation of potential vorticity caused by the poleward-moving winds on the subtropical ridge's western periphery and the increased relative vorticity of poleward moving water, transport is balanced by a narrow, accelerating poleward current, which flows along the western boundary of the ocean basin, outweighing the effects of friction with the cold western boundary current which origniates from high latitudes
Explanation:
13
Help lol please thanks
Answer:
Mass = 15.13 g
Explanation:
Given data:
Number of atoms of hydrogen = 8.11×10²³
Mass of ammonia formed = ?
Solution:
Chemical equation:
3H₂ + N₂ → 2NH₃
Number of moles of hydrogen:
1 mole contain 6.022× 10²³ atoms
8.11×10²³ atoms × 1 mol / 6.022× 10²³ atoms
1.35 mol
Now we will compare the moles of hydrogen and ammonia:
H₂ : NH₃
3 : 2
1.35 : 2/3×1.35 = 0.89 mol
Mass of ammonia:
Mass = number of moles × molar mass
Mass = 0.89 mol × 17 g/mol
Mass = 15.13 g
Choose the BEST answer from the four options A, B, C, or D: Due to which property of LPG are we asked to close the valve of the gas cylinder, in the kitchen in our homes? A. It is inflammable B. It is a liquid C. It has a bad smell D. It is a mixture
Answer:
A
Explanation:
We are usually asked to close the valve of the gas cylinder in our various kitchens at home due to the inflammable property of the Liquified Petroleum Gas.
Without closing the valve, the LPG would diffuse into our homes, and any form of spark would cause an explosion and lead to a fire. Lives and properties could be lost in the process.
The correct option is A.
What two things impact density of ocean water
Answer:
Temperature and salinity
Explanation:
Hey please answer this...
Answer:
594.6005021gHCl
Explanation:
[tex]734.0gNO(\frac{1molNO}{30.006gNO})=24.46177431molNO\\24.46177431molNO(\frac{4molHCl}{6molNO})=16.30784954molHCl\\\16.30784954molHCl(\frac{36.461gHCl}{1molHCl})=594.6005021gHCl[/tex]
Answer:
594.6005021gHCl
Explanation:
The science of classifying and naming organisms based on their different characteristics is called _________.
Answer:
taxonomy
Explanation:
Answer:
Taxonomy
Explanation:
The taxonometric way of classifying organisms is based on similarities between different organisms. A biologist named Carolus Linnaeus started this naming system. He also chose to use Latin words.
14. The noble gases in Group 18 are very reactive. *
O True
O False
Answer: the answer is True
Explanation:
A major component of gasoline is octane. When liquid octane is burned in air it reacts with oxygen gas to produce carbon dioxide gas and water vapor. Calculate the moles of octane needed to produce 2.40 mol of water. Be sure your answer has a unit symbol, if necessary, and round it to 3 significant digits.
Answer:
0.267 mol
Explanation:
The unbalanced equation for the reaction that takes place is:
C₈H₁₈ + O₂ → H₂O + CO₂Once we balance it we're left with:
2C₈H₁₈ + 25O₂ → 18H₂O + 16CO₂Using the stoichiometric ratio of water and octane from the balanced reaction, we can convert mol of water into mol of octane:
2.40 mol H₂O * [tex]\frac{2molC_8H_{18}}{18molH_2O}[/tex] = 0.267 mol C₈H₁₈Thus 0.267 moles of octane are needed to produce 2.40 mol of water.
