Answer:
I think third one is the right answer
Explanation:
if it is right please mark me as brainliest
Answer:velocity is positive
acceleration negative?
Explanation:
Write 2.0 x 10^-3 in standard notation.
Answer:
2.3 * 1,000 = 2,300
Explanation:
how did you determine where the lake was most likely to be ?
a moist red litmus paper is used for testing ammonia gas ,why
A moist red litmus paper is used for testing ammonia gas because ammonia is a base which turns moist red litmus paper blue.
What is a base?According to the Arrhenius concept, base is defined as a substance which yields hydroxyl ions on dissociation.These ions react with the hydrogen ions of acids to produce salt in an acid-base reaction.
Bases have a pH higher than seven as they yield hydroxyl ions on dissociation.They are soapy in touch and have a bitter taste.According to the Lowry-Bronsted concept, base is defined as a substance which accepts protons .Base react violently with acids to produce salts .Aqueous solutions of bases can be used to conduct electricity .They can also be used as indicators in acid-base titrations.
They are used in the manufacture of soaps,paper, bleaching powder.Calcium hydroxide ,a base is used to clean sulfur dioxide gas while magnesium hydroxide can be used as an antacid to cure acidity.
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What is the speed of a 6-kg bowling ball that has 30 J of kinetic energy?
Answer: 2700J
Explanation:
help me (photo attached). I'll mark brainiest :O
Answer:
1. freshwater and marine.
2. Living parts of plants and animals
3. Only plants
4. Meats and plants
5. Meats
6. Other: (Anything they can find that's edible)
7. Break down dead plants and animals into nutrients
8. Prey
9. Rainfall
10. Deserts
Let me know if this helped! Have a nice day! Tell me if these are correct and if any are wrong!
According to this entry from the periodic table, a neutral nitrogen atom usually has
____ protons, ____ neutrons, and _____ electrons.
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:
5. Dorji blows air into a red balloon and then squeezes out the air from it. Explain why it is a
physical change.
Answer:
This did not change the latex/composition of the balloon it just filled and went out.
Explanation:
Its the same way you fill a container without it being a chemical change.
What happens to air pressure as you move upward into the atmosphere?
it increases
it decreases
it remains constant or stays the same
it fluctuates and increases and decreases
Answer:
Pressure decreases with increasing altitude
Explanation:
At higher elevations, there are less air moecules.
Explanation:
The pressure exerted by the air in the atmosphere is greatest at Earth's surface and falls as altitude increases. The reason is that density and depth of the atmosphere are greatest at sea level and decline with increasing altitude.
where da fine shortys at follow da gram yfbg.jay
Answer:
no <3
Explanation:
Answer:
brody this aint the place for that daddy;)( no homo tho i aint with that gay stuff)
Explanation:
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
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.
Why was it so important that the scientist investigating the atom be young and unattached to existing scientific thinking
Answer:
so they can find the aswer and not get hurt
Explanation:
The scientist Neil Bohr has investigated the atom to be young and unattached to Albert Einstein thinking because he is fearless of his thinking and ready to find an explanation.
What is Einstein model?Einstein model is called as Einstein solid model. He stated as ever solid atom oscillate with the same frequency and contain large number of three dimensional quantum harmonic oscillation.
Bohr atomic model stated that electron revolve around the nucleus in its stable orbital without emitting radiant energy. It is primitive model of hydrogen atom. Bohr has given the expression l = nh / 2π
Where n = principle quantum number, l = angular momentum and h = plank constant
Thus, the scientist Neil Bohr has investigated the atom to be young and unattached to Albert Einstein thinking because he is fearless of his thinking and ready to find an explanation.
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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]
Ice cube trays hold about 350 grams of water. If the water comes out of the faucet at 37 degrees celcius, how much evergy do I have to remove to freeze the ice cubes?
Answer:
-171.79 KJ
Explanation:
We must keep in mind that water freezes at 0 degrees centigrade
Recall that heat lost during freezing can be obtained from;
H = mc(θ2 - θ1)
m = mass of the water = 350 g/1000 = 0.35 Kg
c = specific heat capacity of water = 4,200 J/kg°C
θ2 = final temperature = 0°C
θ1 = initial temperature = 37°C
H= 0.35 * 4,200 * (0 - 37)
H = -54390 J = -54.39 KJ
Energy given out when 1 mole of water freezes at its freezing point = -6.04 kJ
For 350 g of water; 350 g/18 g/mol * -6.04 kJ = -117.4 kJ
Hence total energy removed = (-54.39 KJ) + (-117.4 kJ) = -171.79 KJ
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:
who is Aufabu? Is he a man ?
Answer: No, it is a rule. The aufbau principle, from the German Aufbauprinzip, also called the aufbau rule, states that in the ground state of an atom or ion, electrons fill atomic orbitals of the lowest available energy levels before occupying higher levels. For example, the 1s subshell is filled before the 2s subshell is occupied.
How many grams are in 4.39 mol of copper
Answer: 278.966
Explanation: You can also approximate the number to 278.97
how many state of matter do we have
Answer:
3 we have three states of matter
Answer:
We have THREE (3) states of matter namely;
*Solid state
*Liquid state
*Gaseous state
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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how many molecules of co2 in 97.3 grams of co2
Answer:
1.33 × 10²⁴ molecules CO₂
General Formulas and Concepts:
Chemistry - Stoichiometry
Reading a Periodic TableDimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:
Step 1: Define
97.3 g CO₂
Step 2: Define conversions
Avogadro's Number
Molar Mass of C - 12.01 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of CO₂ - 12.01 + 2(16.00) = 44.01 g/mol
Step 3: Convert
[tex]97.3 \ g \ CO_2(\frac{1 \ mol \ CO_2}{44.01 \ g \ CO_2} )(\frac{6.022 \cdot 10^{23} \ molecules \ CO_2}{1 \ mol \ CO_2} )[/tex] = 1.33138 × 10²⁴ molecules CO₂
Step 4: Check
We are given 3 sig figs. Follow sig fig rules.
1.33138 × 10²⁴ molecules CO₂ ≈ 1.33 × 10²⁴ molecules CO₂
In photosynthesis-
A. light energy is transformed into chemical energy
B. molecular energy is transformed into kinetic energy
C. chemical energy is transformed into light energy
D. light energy is transformed into heat energy
Answer:
A.
Explanation:
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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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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Which of the following is a Halogen??
Answer:
Bromine
Explanation:
It's the halogen color on the periodic table of elements.
Answer:
Bromine
Explanation:
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
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
What is the smallest unit of life that conducts all life functions?
A. cell
B. organelle
C. tissue
D. organ
Answer:
a: cells
Explanation:
just did it. your welcome have a nice day
answer :- The smallest unit of life that conducts all life function are cell
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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What is the oxidation number of an element?
A. The number of atoms of an element in a formula
B. The charge an element would have if it lost or gained electrons
C. The number of valence electrons an element has
D. The group number for the element
Answer:
The charge an element would have if it lost or gained electrons