Answer:
3
Explanation
N is 14, so multiply it by 6 (because 6 moles). Since it's N2, divide it by 2, then divide it by 14 (N in grams).
The endocrine system sends hormones through the blood to control the activities of tissues and organs.
Group of answer choices
a. True
b. False
answer:it is false
explanation: as it is true or false I think you don't need explanation
please help its due today..!
Answer:
This all should be correct:
c
a
c
a
Answer:
C, A, B, B
Explanation:
Question 1: C. inner core
Why? Because the inner core is literally the center of the Earth. Meaning it is the hottest part of the Earth.
Question 2: A. crust
Why? The crust is the outer most layer which is the layer we walk on so to speak. The Earth can be broken up into four layers and as said before the crust is the outer part of it. It is actually amounts to less than 1% of Earth's volume.
Question 3: B. basalt
Why? If we were to average the oceanic crust we would get something around six kilometers and this is the thickness. This is mostly made up of basalt.
Question 4: B. outer core
Why? Due to difference in pressure and temperature the outer core tends to release dense matter which sinks while warm (less dense rises). This causes the Coriolis force, resulting from the Earth's rotations.
What is the general word equation for salt formation by neutralization?
a. Metal + nonmetal
b. Acid + metal
c. Base + nonmetal
d. Acid + base
Answer:d. Acid+base
Explanation:
Because, The general word equation for salt formation by neutralization is acid + base = salt + water.
Answer:
D ACID + BASE
Explanation:
Determine whether these statements describe Geiger counters, scintillation counters, both, or neither. An amplifying device that indicates the presence of ionizing particles A device that permits determination of alpha and beta radiation emitted from a substance Film sensitive to radiation that is removed and developed to measure exposure A device used for monitoring individual cumulative exposure to ionizing radiation
Answer:
An amplifying device that indicates the presence of ionizing particles
GEIGER COUNTERS
A device that permits determination of alpha and beta radiation emitted from a substance
BOTH
Film sensitive to radiation that is removed and developed to measure exposure
NEITHER
A device used for monitoring individual cumulative exposure to ionizing radiation
NEITHER
Explanation:
1. Geiger counters and scintillation counters can be described by statements 1 and 2.
2. Statement 3 refers to film-based radiation detectors, not Geiger counters or scintillation counters.
3. Statement 4 refers to dosimeters, not Geiger counters or scintillation counters.
1. An amplifying device that indicates the presence of ionizing particles: This statement describes both Geiger counters and scintillation counters. Both types of counters use amplifying devices to detect and indicate the presence of ionizing particles.
2. A device that permits determination of alpha and beta radiation emitted from a substance: This statement describes both Geiger counters and scintillation counters. Both types of counters are capable of detecting alpha and beta radiation.
3. Film sensitive to radiation that is removed and developed to measure exposure: This statement describes neither Geiger counters nor scintillation counters. Instead, it refers to film-based radiation detectors, such as photographic film or thermoluminescent dosimeters (TLDs), which are used to measure radiation exposure.
4. A device used for monitoring individual cumulative exposure to ionizing radiation: This statement describes neither Geiger counters nor scintillation counters.
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Which describes the boundary where earthquake activity occurs along rift valleys? divergent boundary in the ocean divergent boundary on land convergent boundary in the ocean divergent boundary on land
Answer:
Divergent boundary on land
Explanation:
A rift valley is a lowland region that forms where Earth’s tectonic plates move apart (diverge), or rift. Rift valleys are found both on land and at the bottom of the ocean, where they are created by the process of seafloor spreading.
Rift valleys are created by tectonic activity and not the process of erosion.
Tectonic plates are huge, rocky slabs of Earth's lithosphere—its crust and upper mantle. Tectonic plates are constantly in motion—shifting against each other in fault zones, falling beneath one another in a process called subduction, crashing against one another at convergent plate boundaries, and tearing apart from each other at divergent plate boundaries.
The most well-known rift valley on Earth is probably the so-called "Great Rift Valley System" which stretches from the Middle East in the north to Mozambique in the south. The area is geologically active, and features volcanoes, hot springs, geysers, and frequent earthquakes.
Divergent boundary on land describes the boundary where earthquake activity occurs along rift valleys
for better understanding let's explain divergent plate boundary
Divergent plate boundary often happens only where 2 tectonic plates separate and thereafter create new land. most of them are in the ocean (Mid Atlantic Ridge). The Great Rift Valley in Africa is an example of a divergent plate boundary on thereafter the Great Rift Valley is filled of with water and product is a sea.Rift valley is commonly known as an area in a mid-ocean ridge where the plates are often separated and new crust begins to form. where plate tectonics exist, there is a divergent boundary or divergent plate boundary also called constructive boundary orfrom the above we can therefore say that the answer Divergent boundary on land describes the boundary where earthquake activity occurs along rift valleys, is correct
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which term names a small icy object that orbits the sun?
Answer:
It a comet
Explanation:
that why they are also called dirty snowballs
Answer:
A comment
Explanation:
Because I took the test and that 100 and because comets are icy and sometimes lead tale of water droplets behind them
what percentage of water on earth is fresh water
Answer:
only 2.5% is fresh water on earth
Answer:
The answer is 3%
Explanation:
Jenna is playing with her toy cars, which are both the same size. She pushes the red car with a strong push. She pushes the blue car with a weak push. What should Jenna expect to observe?
Answer:
red car will travel a much farther distance and at a faster speed as opposed to the blue car
Explanation:
Based on the information provided within the question Jenna can expect to observe that the red car will travel a much farther distance and at a faster speed as opposed to the blue car which will travel a shorter distance and at a lower speed. This is mainly because Jenna is applying an increased amount of force on the red car thus creating more acceleration and ultimately increasing the distance.
when does thermal energy stop moving
Answer:
at absolute zero.
Explanation:
absolute zero or 0 kelvin, is where all kinetic movement of electrons ceases in a molecule.
what are the rules for calculating protons
Answer:
Find the element,
Explanation:
Finding the element will tell you how many protons there are. For example, if you are given an atom of oxygen, you can figure out the number of protons by looking it up on a periodic table, which gives you 8.
If an atom is neutral, find the number of electrons. This number will also be the number of protons.
Explain why matter takes space
What mass of solute is needed to prepare each of the following solutions?
a. 1.00 L of 0.125 M K2SO4
b. 375 mL of 0.015 M NaF
c. 500 mL of 0.350 M C6H12O6
Answer:
a. 21.7824 g
b. 0.2362 g
c. 31.5273 g
Please see the answers in the picture attached below.
Explanation:
Please see the step-by-step solution in the picture attached below.
Hope this answer can help you. Have a nice day!
The mass of solute required in each case can be obtained form the stoichiometry of the reaction.
We know that the mass of each solution can be obtained from the relation;
mass/molar mass = concentration × volume
mass = concentration × volume × molar mass
a)
mass = 0.125 M × 1.00 L × 174 g/mol = 21.75 g
b) mass = 0.015 M × 375 /1000 × 42 g/mol = 0.24 g
c) mass = 0.350 M × 500/1000 × 180 g/mol =31.5 g
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1. Why is hot air hot?
Answer:
Explanation:
Radiation from the sun heats the ground, then the ground heats the air by process of conduction. When that happens air temp. and density start to change causing air convection currents. Hope I help.
A sample of air has a volume of 140.0 mL at 67C. To w
hat temperature must the gas
be lowered to reduce its volume to 50.0 mL at constant pressure?
Answer:
What that means is that when pressure and number of moles are kept constant, increasing the temperature will result in an increase in volume. Likewise, a decrease in temperature will result in a decrease in volume. In your case, the volume of the gas decreased by a factor of about 3, from "140.0 mL" to "50.0 mL".
Please help
What causes a wave to have a higher amplitude?
Answer:
More energy
Explanation:
Wave amplitude is determined by the energy of the disturbance that causes the wave. A wave caused by a disturbance with more energy has greater amplitude.
Answer:
energy of the disturbance
Explanation:
........ btw bts paved the way I saw you was army and thought I would say that
A chemistry student mixes 25 milliliters of 3.0 M hydrochloric acid (HCl) with excess sodium hydroxide. The chemicals react according to this chemical equation:
HCl + NaOH → NaCl + H2O.
If the volume of the resulting solution is 68 milliliters, what is the concentration of sodium chloride?
Answer:
1.1 mol/liter
Explanation:
You would use the M1V1 = M2V2 equation to solve this.
We know M1 is 3.0 M, V1 is 25 milliliters, and V2 is 68 milliliters. We need to find M2.
To find M2, first plug in what you know.
(3.0 M)(25 mL) = M2(68 mL)
Then, divide everything by 68 mL to get M2 by itself
Your answer should be a quite large decimal but I rounded it to 1.1 mol/liter.
Answer:
The concentration of sodium chloride is 1.1 moles/liter.
Explanation:
Could somebody answer these questions for me? Thanks!
1. What percentage of the earth is covered by water?
2. What sorts of signals does the brain use to communicate sensations, thoughts and actions?
3. Did dinosaurs and humans ever exist at the same time?
4. What is Darwin's theory of the origin of species?
5. Why does a year consist of 365 days and a day of 24 hours?
Explanation:
1) %70 earth is water and %30 is land.
2)" The single cells in the brain communicatethrough electrical and chemical signals.
3) b'coz earth revolve around the sun in365 days and rotates on its axis in 24 hours. It takes 365 days , because it takes that much time to complete one revolution and it takes 24 hours,because it takes time to complete one rotation as mercury takes 81 earthdays to complete one revolution.
4) Human originated from Adam And Eve.
An example of a double replacement chemical reaction takes place in batteries. In an alkaline battery, Manganese oxide reacts with water to form a different manganese oxide and hydroxide. Which is the correct balanced equation for this?
Answer:
2MnO2 + H2O => Mn2O3 + 2OH is the correct balanced equation.
When manganese oxide reacts with water to form a different manganese oxide and hydroxide, the correct balanced equation for this is 2MnO₂ + H₂O ⇾ Mn₂O₃ + 2OH.
What do you mean by balanced chemical equation ?The term balance chemical equation is define as the equation which satisfy the law of conservation of mass, i.e., “Total mass of the products is equal to the total mass of all the reactants”.
If a chemical equation is not balanced, it will break the law of conservation of mass. It will indicate that either mass is created or destroyed, which is impossible.
Balanced chemical equations have the equal number and type of each atom on both sides of the equation.
Thus, When manganese oxide reacts with water to produce a different manganese oxide and hydroxide, the correct balanced equation for this reaction is 2MnO₂ + H₂O ⇾ Mn₂O₃ + 2OH.
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HELP MEHHHHH were does the first stage of cellular respiration occur ?
Answer:
mitochondria
Explanation:
Cellular respiration occurs primarily in the mitochondria of your cells. The mitochondria is like the powerhouse of cells .
does gravity affect the orbit of the international space
Answer:
yes
Explanation:gergrgregbfbwerbebw
Which system produces immune cells?
A. circulatory
B. lymphatic
C. skeletal
D. respiratory
B. i think.
hope i helped! :)
Consider the total ionic equation below.
Ba2+ + 2NO3 + 2Na+ + Co3 —BaCO3 + 2Na+ + 2NO3
Which is the net ionic equation for the reaction?
O Ba2+ + C03 —> BaCO3
© 2Na+ + co} → Na2CO3
NO3 + Na* —> NaNO3
O Ba2+ + 2NO3 →→ Ba(NO3)2
Answer:
Ba²⁺ + CO₃²⁻ → BaCO₃
Explanation:
A net ionic equation is a way to write a chemical reaction in which you list only the species that are participating in the reaction.
For the reaction:
Ba²⁺ + 2NO₃ + 2Na⁺ + CO₃²⁻ → BaCO₃ + 2Na⁺ + 2NO₃
As you can see, NO₃ and Na⁺ are not participating in the reaction. Thus, net ionic equaation is:
Ba²⁺ + CO₃²⁻ → BaCO₃
Complete Question
Consider the total ionic equation below.
[tex]Ba^{2+} + 2NaO_3^{1 -} + 2Na^{+} + CO_3^{2-} ----> BaCO_3 + 2Na^{+} + 2NO_3^{1-}[/tex]
Which is the net ionic equation for the reaction?
A [tex]Ba^{2+} _{(aq)} + CO_3 ^{2-} _{(aq)} ----> BaCO_3_{(s)}[/tex]
B [tex]2Na^+ + CO_2 ----> Na2CO3[/tex]
C [tex]NO3 + Na ^ + ----> NaNO3[/tex]
D [tex]Ba_2^+ + 2NO3 ----> Ba(NO3)2[/tex]
Answer:
Option A is the correct option
Explanation:
The given ionic equation is
[tex]Ba^{2+} + 2NaO_3^{1 -} + 2Na^{+} + CO_3^{2-} ----> BaCO_3 + 2Na^{+} + 2NO_3^{1-}[/tex]
Looking at this complete ionic equation we see that [tex]Na^{+1} \ and \ NO_3^{1-}[/tex] did not change in the reaction so they will not be included in the net ionic equation so the net ionic equation becomes
[tex]Ba^{2+} _{(aq)} + CO_3 ^{2-} _{(aq)} ----> BaCO_3_{(s)}[/tex]
what causes different colors to appear in the sky?
Answer:
Molecules and small particles in the atmosphere change the direction of light rays, causing them to scatter. Scattering affects the color of light coming from the sky.
Explanation:
can someone Fing answer this PLEASE! NOW
Chemical Reactions Performance Task
Description: A student conducted two different demonstrations in their science class that started with copper chloride (CuCl₂). They have provided you with the following data tables to help you determine if a physical change or chemical reaction occurred during the demonstrations.
Demonstration 1:
Reactants
substances at beginning of reaction
Products
substances at the end of the reaction
Substance
(Chemical Formula)
Copper Chloride
(CuCl₂)
Water
(H₂O)
Copper Chloride
(CuCl₂)
Water
(H₂O)
Properties
Density: 2.51 g/cm³
Melting Point: 100ºC
Boiling Point: 993ºC
Density: 1 g/cm³
Melting Point: 0ºC
Boiling Point: 100ºC
Density: 2.51 g/cm³
Melting Point: 100ºC
Boiling Point: 993ºC
Density: 1 g/cm³
Melting Point: 0ºC
Boiling Point: 100ºC
Based on the patterns (similarities and differences) in the properties of the reactants and products in the table above, is this a physical or chemical reaction? Cite specific evidence from multiple properties in the data table to support your answer. (5pts)
Claim
Evidence
Reasoning
Demonstration 2:
Reactants
substances at beginning of reaction
Products
substances at the end of the reaction
Substance
(Chemical Formula)
Copper Chloride
(CuCl₂)
Iron
(Fe)
Iron Chloride
(FeCl₂)
Copper
(Cu)
Properties
Density: 2.51 g/cm³
Melting Point: 100ºC
Boiling Point: 993ºC
Density: 7.86 g/cm³
Melting Point: 1538ºC
Boiling Point: 2682ºC
Density: 3.16 g/cm³
Melting Point: 677ºC
Boiling Point: 1023ºC
Density: 8.96 g/cm³
Melting Point: 1085ºC
Boiling Point: 2562ºC
Based on the patterns (similarities and differences) in the properties of the reactants and products in the table above, is this a physical or chemical reaction? Cite specific evidence from multiple properties in the table to support your answer. (5pts)
Claim
Evidence
Reasoning
Using the data from Demonstrations 1 and 2, fill out the table below to describe the difference between a physical and chemical reaction in terms of the rearrangement and/or conservation of atoms and molecules. Choose conserved or not conserved for atoms. Choose rearranged or not rearranged for molecules. (4pts)
Physical Changes
Chemical Reactions
Atoms:
(conserved/not conserved)
Molecules
(Rearranged/Not rearranged)
Answer:
Need to broken down more.
Explanation:
Answer:
its FIND NOT fing
Explanation:
The Ka for benzoic acid is 6.5 × 10−5. Calculate the pH of a 0.12 M benzoic acid solution.
Answer:
pH=4.05
Explanation:
C7H6O2 -> C7H6O- + H+
ka= [C7H6O-] [H+]/[C7H6O2]
During equilibrium
[C7H6O-]= [H+]= x^2
[C7H6O2]=0.12-x
Replace
ka= x^2/0.12-x
6.5 x10^-5= x^2/0.12-x
7.8x10^-6 - 6.5 x10^-5x=x^2
x^2+ 6.5 x10^-5x - 7.8x10^-6
Solution of quadratic equation
x=8.8 x10^-5
pH= -log [H+]= -log 8.8 x10^-5=4.05
The pH value of the benzoic acid solution is equal to 4.05.
What is pH?pH can be defined the negative logarithm of hydrogen ion concentration. pH can be seen as an abbreviation of the power of hydrogen or the concentration of hydrogen ions in a solution.
Mathematically, pH equals the negative logarithmic value of the concentration of hydrogen ion (H⁺).
pH = -log [H⁺]
The pH scale have range from 0 to 14 when 7.0 is neutral. A low pH is acidic and a high pH is basic. Pure water has a pH of 7.0.
The partial dissociation of benzoic acid in an aqueous solution can be shown as:
[tex]C_6H_5COOH +H_2O[/tex] ⇄ [tex]C_6H_5COO^- +H_3O^+[/tex]
ka= [C₆H₅O⁻] [H₃O⁺]/[C₆H₅COOH]
At equlibrium:[C₆H₅O⁻] = [H₃O⁺] = x²
[C₆H₅COOH] = 0.12-x
The equilibrium constant: ka= x²/0.12-x
6.5 × 10⁻⁵ = x²/0.12-x
7.8 × 10⁻⁶- 6.5 × 10⁻⁵ x = x²
x²+ 6.5 × 10⁻⁵ x- 7.8 × 10⁻⁶ = 0
The solution of the given quadratic equation will be:
x = 8.8 × 10⁻⁵
pH= -log [H⁺]= -log [8.8 × 10⁻⁵] = 4.05
Therefore, the pH of the given benzoic acid solution is 4.05.
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Compare and contrast monoprotic and polyprotic acids.
3. The organelle that produces materials that need to be released from the cell
is the:
A. storage granule
B. microvilli
C. chloroplast
D. vacuole
4. An organelle found in plant cells, fungi, and some protists, animal cells, and
bacteria is the:
A. storage granule
B. microvilli
C. chloroplast
Dvacuole
why do we see only one side of the moon from earth?
Answer:
The moon's period of rotation and revolution are equal
Which statement best describes the difference between nuclear fission and nuclear fusion reactions?
Answer:
They are both nuclear reactions that produce energy.
Fission is the splitting of heavy, unstable nucleus into two lighter nuclei.Fusion is the process where two light nuclei combine together (this process releases a vast amount of energy)Several atmospheric gases contribute to global warming: carbon dioxide, methane, and nitrous oxide. Considering this, which choice would do the LEAST to directly reduce atmospheric carbon dioxide.
Answer:
A
help u and it's A
Explanation:
