Answer:
temperature differences
Explanation:
Solar heating of the Earth's surface is uneven because land heats faster than water, and this causes air to warm, expand and rise over land while it cools and sinks over the cooler water surfaces. ... Wind is the result of pressure changes in the atmosphere.
TRUE OR FALSE
The products are the molecules that are produced in a reaction.
Answer:
true
Explanation:
the new substances formed as a result of a chemical reaction are called products
Why do elements form an ionic bond
Answer:
An ionic bond is formed when a metallic element and a non-metallic element form a compound.
Explanation:
As you may know, each atom contains a set amount of electrons. For example, Hydrogen has one electron, helium has two electrons, lithium has three electrons and so on.
Electrons come in shells. The first shell can hold 2 elections at most, and each shell past this point can hold 8 electrons. When an atom has a filled outer shell, it is considered stable. (This so why the noble gases are unreactive- they have a full outer shell of electrons.)
This is why compounds can form- it is the chemical bonding of 2 or more chemical elements: take NaCl, sodium chloride, or SO2, sulphur dioxide.
You specifically asked about ionic bonds. Ionic bonds, as expressed above, form between a compound of a metallic and non metallic element.
Let's take sodium chloride as an example. Sodium has 1 electron in its outer shell and chlorine has 7. Both need a full outer shell to become stable. Because of this, the sodium atom loses its only electron in its outer shell to become a sodium ion and the chlorine atom gains the electron to become a chlorine ion as well. Because of this, both ions have a full outer shell, rendering them stable.
Now, because the sodium ion is short of one electron, it has more protons than electrons, resulting in it having a positive charge. The chlorine ion is the opposite, having a negative charge.
Problem #2: A photographic "stop bath" contains 160mL of pure acetic acid,
HC H20 in 650ml solution. What is the v/v concentration of acetic acid
in the stop bath?
Answer:
100008
Explanation:
The v/v concentration of 160ml pure acetic acid in 650ml solution is 24.61 %.
There is 160ml of pure acetic acid in the 650 ml solution of acetic acid.
The volume/volume concentration of acetic acid can be calculated as:
Volume/Volume = [tex]\rm \frac{volume\;of\;acetic\;acid}{Volume\;of\;solution}\;\times\;100[/tex]
v/v = [tex]\rm \frac{160}{650}\;\times\;100[/tex]
v/v = 0.2461 [tex]\rm \times[/tex] 100
v/v = 24.61 %
The concentration of pure acetic acid in the 650 ml solution is 24.61 % (v/v).
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Complete Table G to view the effect of surface area on the rate of reaction by transferring your data from Tables D and E to Table G.
Which form of the sodium bicarbonate tablet dissolves the fastest?
- Whole Tablet
- Quartered Tablet
- Crushed Tablet
Answer:
The answer would be
crushed tablet
Explanation:
just took the test on edg2020
Answer:
Crushed Tablet
Explanation:
How many zeroes are significant in the measurement 0.0400200?
Answer:
4
Explanation:
if the 0 is in the beginning it is not significant.
0 in between are always significant.
the 0 at the end are only significant if theres a decimal.
How many moles of oxygen atoms (not
molecules) are present in 6.41×1025 molecules
of dinitrogen pentoxide (N2O5)?
1. 532 mol
2. 106 mol
3. 32 × 1025 mol
4. 266 mol
Answer:
532 moles of O atoms.
Explanation:
Given data:
Number of moles of oxygen atom present = ?
Number of molecules of N₂O₅= 6.41×10²⁵ molecules
Solution:
First of all we will calculate the number of moles of N₂O₅.
1 mole = 6.022×10²³ molecules
6.41×10²⁵ molecules × 1 mol /6.022×10²³ molecules
106.4 mol
Number of atoms of O:
1 mole of N₂O₅ contain 5 moles of O atoms.
106.4×5 = 532 mol
please answer Look at this image of a galaxy. Which type of galaxy is shown? A. elliptical B. irregular. C. normal spiral or D. barred spiral
Answer:
c .
Explanation:
Answer:
c
Explanation:
When the first American astronauts were planning to walk on the Moon, they knew that the gravity on the Moon was less than the gravity on Earth. With this information, what did the astronauts expect to be MOST different on the Moon? Select one: a. their mass b. their height c. their weight d. their volume
Answer:
Their weight.
Explanation:
Weight is the measurement of gravity pushing you down, so with less gravity there would be less weight.
The astronauts expect their weight to be different on the Moon
Definition of weightWeight is simply defined as the gravitational pull of the earth on an object. It is measured in Newton.
Description of weightThe weight of an object varies with location because of gravity.
The weight of an object is related to it's mass according to the following equation:
Weight = mass × Acceleration due to gravity
Since the gravity of the Moon is lesser than that of the Eearth, the astronauts certainly knew that their weight will be different on the Moon.
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I AM SO CONFUSED PLEASE HELP:(
When ice at 0°C melts to liquid water at 0°C, it absorbs 0.334 kJ of hear per gram. Suppose the heat needed to melt 49.5 g of ice is absorbed from the water contained in a glass. If this water has a mass of 0.219 kg and a temperature of 21.0°C, what is the final temperature of the water? Assume the specific heat is that of pure water, 4.18 J/(g-°C). (Note that you will also have 49.5 g of water at 0°C from the ice.)
When ice at 0°C melts to liquid H2O, it absorbs 334 J per gram. The specific heat of water is 4.184 J g– 1 deg–1.
The final temperature of the water is equal to 2.94 °C.
What is the heat capacity?Heat capacity can be described as the amount of heat needed to change the heat content of one mole of material by 1°C. Specific heat is the amount of heat needed to change the heat content of 1 gram of a material by 1°C.
The heat energy is absorbed by a substance, and its temperature increases. The rise in the temperature for each substance is different for different substances therefore, they have different heat capacities.
Given, the mass of the ice = 49.5 g
the mass of water, m= 0.219 Kg
The specific heat of water,Cp = 4.18 J/(g.°C)
The change in the temperature of the water, ΔT = (T - 21)°C
The heat absorbed by ice = 49.5 × 0.334 KJ = 16.53 KJ
The heat lost by water = 219 × 4.18 × (T - 21)
The heat absorbed by ice = The heat lost by water
-16.53 KJ = 219 × 4.18 × (T - 21) J
- 16530 = 915.42 (T-21)
T-21 = - 18.06
T = 2.94 °C
Therefore, the final temperature of the water is 2.94 °C.
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What is the standard cell notation of a galvanic cell made with magnesium
(Mg) and gold (Au)?
Answer:
Mg(s) | Mg2 + (aq) Au + (aq) | Au(s)
Explanation:
The standard cell notation of a galvanic cell made with magnesium (Mg) and gold (Au) Mg(s) | Mg² + (aq) Au + (aq) | Au(s).
Thus, The cathode is the location of reduction, while the anode is the location of oxidation. The identity of the electrodes in a real cell depends on the direction that the net cell reaction is taking place.
If, during spontaneous operation, electrons move from the left electrode to the right electrode (as shown in the cell notation above), the right electrode's potential will be higher than the left electrode's, and the cell potential will be positive.
The direction of "conventional current flow" goes from positive to negative, which is the reverse of how electrons move. This means that a galvanometer installed in the external circuit would show a positive reading if the electrons are flowing from the left electrode to the right.
Thus, The standard cell notation of a galvanic cell made with magnesium (Mg) and gold (Au) Mg(s) | Mg² (aq) Au + (aq) | Au(s).
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What is the speed of a 6-kg bowling ball that has 30 J of kinetic energy?
Answer: 2700J
Explanation:
Why solid heat faster than liquid?
A. Because the molecules of solid are far to each other
B. Because the molecules of solid are close to each other
C. Because the molecules of solid are not moving.
D. Because the molecules of solid are very small.
please answer me the correct answer
Answer:
The answer is B. The molecules of a solid are close to each other
Which of the following is a Halogen??
Answer:
Bromine
Explanation:
It's the halogen color on the periodic table of elements.
Answer:
Bromine
Explanation:
what did hooke find in his research
Answer:Robert Hooke, (born July 18 [July 28, New Style], 1635, Freshwater, Isle of Wight, England—died March 3, 1703, London), English physicist who discovered the law of elasticity, known as Hooke’s law, and who did research in a remarkable variety of fields.
Explanation:
In 1655 Hooke was employed by Robert Boyle to construct the Boylean air pump. Five years later, Hooke discovered his law of elasticity, which states that the stretching of a solid body (e.g., metal, wood) is proportional to the force applied to it. The law laid the basis for studies of stress and strain and for understanding of elastic materials. He applied these studies in his designs for the balance springs of watches. In 1662 he was appointed curator of experiments to the Royal Society of London and was elected a fellow the following year.
One of the first men to build a Gregorianreflecting telescope, Hooke discovered the fifth star in the Trapezium, an asterism in the constellation Orion, in 1664 and first suggested that Jupiter rotates on its axis. His detailed sketches of Mars were used in the 19th century to determine that planet’s rate of rotation.
A cell contains the same DNA as its parent cell. This is a result of which process? mitosis meiosis gamete formation fertilization
Answer:
Mitosis
Explanation:
A cell that contains the same DNA as its parent cell is a product of mitosis.
Mitosis is a cell division process that takes place in somatic cells. In meiosis a single cell divides to produce two daughter cells each having the same DNA as the parentMitosis ensures that the same DNA is found between the parentMitosis is used for repairing and production of new cells.Answer:
Mitosis
Explanation:
David is making an omelet. She breaks some eggs into a bowl and uses a fork to beat the eggs. Then, she mixes shredded cheese into the eggs. Finally, she pours the mixture into a hot pan and cooks it until it forms a solid omelet. During which step does a chemical change occur? (7 Points)
David breaks eggs into a bowl.
David uses a fork to beat the eggs.
David makes a mixture of eggs and cheese.
David cooks the mixture of eggs and cheese until it forms a solid.
Answer:
the forth one i think
Explanation:
What do you think our solar system consists of?
Answer:
planets,stars and lots more
Answer: Our solar system consists of the stars, the Sun, the planets (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune), dwarf planets such as Pluto, many moons, and a bunch of asteroids, comets and meteoroids!
Explanation:
Which of these is a helpful interaction that harms no animal
Answer:
It's mutualism I am pretty sure
I hope this helps :)
How can you relate the blocks in the periodic table and the numbers of its column into the electron configuration
Answer:
The elements are listed by atomic number (the number of protons in the nucleus), and elements with similar chemical properties are grouped together in columns.
According to this entry from the periodic table, a neutral nitrogen atom usually has
____ protons, ____ neutrons, and _____ electrons.
How many grams are in 4.39 mol of copper
Answer: 278.966
Explanation: You can also approximate the number to 278.97
After decaying for 48 hours, one-sixteenth (1/16) of the original mass of a radioisotope sample remains unchanged. What is the half-life of this radioisotope?
The half-life of this radioisotope : 12 hr
Further explanationThe atomic nucleus can experience decay into 2 particles or more due to the instability of its atomic nucleus.
Usually radioactive elements have an unstable atomic nucleus.
General formulas used in decay:
[tex]\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{t/t\frac{1}{2} }}}[/tex]
t = duration of decay
t 1/2 = half-life
N₀ = the number of initial radioactive atoms
Nt = the number of radioactive atoms left after decaying during T time
t=48 hr
[tex]\tt \dfrac{Nt}{No}=\dfrac{1}{16}[/tex]
The half-life :
[tex]\tt \dfrac{1}{16}=\dfrac{1}{2}^{(48/t\frac{1}{2} )}\\\\(\dfrac{1}{2})^4=(\dfrac{1}{2})^{48/t\frac{1}{2}}\\\\4=48/t\frac{1}{2}\\\\t\frac{1}{2}=12~hr[/tex]
Will award 25 points!! And give out brainliest :))
Answer:
# of protons is 95
# of neutrons is 147
Hope this helps!
Explanation:
Answer:
Protons: 95
Neutrons: 148
- Protons and electrons are equal
- To find the amount of neutrons, subtract the amount of protons/electrons from the atomic number
how did you determine where the lake was most likely to be ?
what is the specific heat of a 25.0 g substance that absorbs 493.4 j and raises the temperature from 12.0°c to 34°c?
Answer:
Specific heat of substance = 0.897 J/g.°C
Explanation:
Given data:
Specific heat of substance = ?
Mass of substance = 25.0 g
Heat absorbed = 493.4 J
Initial temperature = 12.0 °C
Final temperature = 34°C
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 34°C -12.0°C
ΔT = 22°C
493.4 J = 25 g ×c× 22°C
493.4 J = 550 g.°C ×c
c = 493.4 J / 550 g.°C
c = 0.897 J/g.°C
7th GRADE SCIENCE 25 POINTS I WILL GIVE BRAINLIEST INTERNAL AND EXTERNAL STIMULI IN PLANTS PLEASE LIST 5 EXAMPLES FOR INTERNAL AND 4 EXAMPLES FOR EXTERNAL HELLP PLEASEE ignore the 1st answer for external :)
Answer:
ok how about you answer my question, why would a moderator delete ALL of my answers to peoples questions?! now i have negatove points. smh
Explanation:
ugh sorry -_-
Answer:2.Plants have oxygen in them they also breathe oxygen and help the climate 3.there are all kinds of plants but the very first plant was a tree. 4. You might think plants are genetal normally they are but some types of plants can be very feisty such as the plant that eats stuff like actually opens it mouth some people think this is amazing and can lead to bigger things.! 5. Normally you see the pants normal size like little and pretty but there is enormous plants around the world that can get up to as big as a couch or bigger.
Explanation:
Sorry if I did bad lol
3. You have a sample of fluorine to analyze. The sample is made up of neutral atoms. Using the information in the diagram at the right, determine the number of protons, neutrons, and electrons found in each atom of your sample. Explain your answer.
Answer:
1. Proton number is 9
2. Neutron number is 10
3. Electron number is 9
Explanation:
The following data were obtained from the question:
Atomic number = 9
Mass number = 19
1. Determination of the number of protons.
The atomic number of an element is simply the number of protons present in the atom of that element. Mathematically, it is expressed as:
Atomic number = proton number
Atomic number = 9
Proton number = atomic number = 9
Thus, the proton number is 9
2. Determination of the Neutron number.
Mass number = 19
Proton number = 9
Neutron number =?
Mass number = Proton + Neutron
19 = 9 + Neutron
Collect like terms
19 – 9 = Neutron
10 = Neutron
Thus, the Neutron number is 10.
3. Determination of the number of electrons.
Since the sample is made up of neutral atoms, the number of protons and electrons are equal i.e
Electron number = Proton number
Proton number = 9
Electron number = Proton number = 9
Thus, electron number is 9
Using the information given in the diagram, the number of protons, neutrons and electrons in an atom of the Fluorine-19 sample are 9, 10 and 9 respectively.
Given :
Atomic number = 9Atomic mass = 19The number of protons = Atomic number
Hence, the number of protons = 9
2).
Recall :
Atomic mass = proton number + neutron numberSubstituting the values into the formula :
19 = 9 + neutron number
neutron number = 19 - 9
neutron number = 10
3.)
The number of electrons = proton number + charge
Since, the atom contains neutral atom, then charge = 0
Number of electrons = 9 + 0
Number of electrons = 9
Therefore, the Number of protons, neutrons and electrons are 9, 10 and 9 respectively.
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Which segment of this graph shows a decreasing velocity? F 80 D. El 60 Position (m) с B 20 10 20 30 40 50 60 70 80 90 100 Time (s) OA A to B B. B to C C. C to D D. D to E O E. E to F
A decrease in velocity occurs at point D to E in the given displacement - time graph.
What is velocity?Velocity is defined as the time rate of change of displacement with time. It is measured in meters per second.
A decrease in velocity occurs when there is a small change in displacement at a large amount of time.
Velocity from C to Dv = Δx/Δt
v = (60 - 40)/(60 - 40) = 1 m/s
Velocity from D to Ev = (60 - 60)/(80 - 60) = 0 m/s
Thus, a decrease in velocity occurs at point D to E in the given displacement - time graph.
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Just need help with this last question
its electrical energy -------> light and heat
Hope this helps
mark brainliest if helpful
Answer:
C
Explanation:
Potential energy is obtained by an object's positioning so the first and last choice cannot be correct.
Of course the electrical energy is not destroyed so that one's not correct either.
The energy conversion that takes place must be electrical energy to light and heat.
What’s the answer? I need it ASAP
Answer:
i got c. 57.6 yds
Explanation:
hope u get it right
good luck