Answer:
-Why is Democritus important with regard to atomic theory? Democritus developed his atomic philosophy as a middle ground between two opposing Greek theories about reality and the illusion of change. He argued that matter was subdivided into indivisible and immutable particles that created the appearance of change when they joined and separated from others.
-Dalton's atomic theory was the first complete attempt to describe all matter in terms of atoms and their properties.
-What subatomic particle did JJ Thomson discover? He discovered the electron in 1897.
-In 1913, Neils Bohr proposed a new atomic model known as the Bohr's model, which is patterned after the solar system.
- List the principles of Bohr's model:
a. An electron moves around the nucleus in a circular orbit.
b. An electron's angular momentum in the orbit is quantisized.
c. The change in an electron's energy as it makes a quantum jump from one orbit to another is always accompanied by the emission or absorption of a photon.
- In 1926, Erwin Schrödinger used mathematical equations to describe the likelihood of finding an electron in a certain position. This model is known as the Rutherford Model of an atom.
-In 1932, James Chadwick discovered the neutron.
-Since 1932, the atomic theory has been further enhanced by the concepts that protons and neutrons are made of even smaller units called quarks. The quarks themselves are in turn made of vibrating strings of energy.
-Everything in the universe (except energy) is made up of matter.
-Therefore everything in the universe is made up of atoms.
-An atom itself is made up of three tiny kinds of particles called subatomic particles: protons, neutrons and electrons.
The protons and the neutrons make up the centre called the nucleus.
The electrons fly around above the nucleus in a small cloud.
The electrons carry a negative charge and the protons carry a positive charge.
In a normal (neutral) atom the number of protons is the same number of electrons.
Emelina wrote the equation of a line in point-slope form as shown below.
(y + 4) = 3 (x + 2)
What is Emelina’s equation in slope-intercept form?
I forgot to send this in my last question, Sorry!
[tex]1. \: = > 4( - 7) \\ = 4 \times - 7 \\ = - 28[/tex]
[tex]3. \: = > 9( - 12) \\ = 9 \times - 12 \\ = - 108[/tex]
[tex]4. \: = > - 6( - 8.75) \\ = 6 \times 8.75 \\ = 52.5[/tex]
[tex]5. = > 27( - 3) \\ = 27 \times - 3 \\ = - 81[/tex]
[tex]7. \: = > - 55(0) \\ - 55 \times 0 \\ = 0[/tex]
[tex]8. \: = > ( - 7)( - 7.25) \\ = 7 \times 7.25 \\ = 50.75[/tex]
[tex]11. \: = > ( - 1) {}^{4} \\ = 1 {}^{4} \\ = 1[/tex]
[tex]13. = > 42 \div ( - 7) \\ = - (42 \div 7) \\ = - 6[/tex]
[tex]15. = > - 9 \div 3 \\ = - (9 \div 3) \\ = - 3[/tex]
Solved ✔︎Compare the values of the two expressions using -3(-2) + 3 __3(-4)+9
Answer:
>
Step-by-step explanation:
expression 1: -3(-2) + 3 = 9
expression 2: 3(-4) + 9 = 3
Answer:
I think its number 1
Step-by-step explanation:
graph the ordered pair (-4,-1)
Answer:
-4 would be in the x axes and -1 would be in the y axes
Step-by-step explanation:
I hop i explained it well
The drawing i took dosent want to post
Answer:
Go to the x-axis (horizontal part) and find -4 on your graph. Then go down on the y-axis (vertical part) and look for -1. That's where you're going to plot the point, (-4, -1). I attached a photo to give you a visual.
Referring to the figure, a building casts a
shawdow 18 feet long. A woman standing near the
building is 5 feet 8 inches tall and casts a
shadow 4 feet long. What is the height of the
building in feet and inches?
HHHHHEEEEELLLLPPPPPP Please :> HAAAAAAAAAAALLLLLLLLLPPPPPPPPPPPPPPP
Trey's racehorse weighs 400 kilograms. How much does it weigh in grams?
Be sure to include the correct unit in your answer.
Answer,, 400000 grams
Explanation, 1 kilogram = 1000 grams,, you basically have to multiply 400 by 1000, you get 400000,, you're welcome. :)
please help me im not sure what to do
Answer:
Its 1 or 3 i think
Step-by-step explanation:
Find the next two numbers in a pattern?
7, - 28,112, - 448 __, __, . . .
Answer:
1,792 -7168
the pattern is to multiply by -4
Step-by-step explanation:
7 · -4 = -28
-28 · -4 = 112
112 · -4 = -448
-448 · -4 = 1,792
1,792 · -4 = -7168
Henry buys a house for $669,500 including closing costs. The closing costs are 3%. What is the price of the house without closing costs?
Answer:
Step-by-step explanation:
Don't know been years since i did percentages
Answer:
20,085 US$ that's the answer And sub to candy girl Drew on yt
In order to make green paint, a 2:3 ratio of blue paint to yellow paint is used. If there are 30 ounced of green paint how many ounces of blue panit was used?
Answer:
12 ounces
Step-by-step explanation:
2+3=5
30÷5=6
6×2=12
HELP I AM GOING TO BE ASKING QUESTIONS ALL DAY!!!!!!
Answer:
what do you need help with
Step-by-step explanation:
please someone help me
Answer:
Question 11:
A. He saves 63 dollars in week 1. 16 + 54 - 7 = 63
B. He saved 160 dollars after 2 weeks. 62 + 41 - 6 = 97 97+63= 160
C. Yes, he has 302 dollars after 3 weeks. 160 + 150 - 8 = 302
Step-by-step explanation:
12. 2, 4, and 5 are correct mah dude. take thy quiz correctly young one.
AND USE SCRATCH SHEET O' PAPER MAH GEEZ!
What is the GCF using distributive property of 40 and 25?
Answer:
Great Common Factor ♡•♡
Answer:
5 :)
Step-by-step explanation:
The number of kneepads (k) needed for a volleyball team depends on the number of players (p) on the team. Each player needs 2 kneepads. Which of the following are correct representations of this situation? Select all that apply.
Answer:
Look at the circled answers below (I hope its right):
I dont understand this so can someone drop me the solution as well? thx
Choose all the fractions that are equivalent to [tex]\frac{4}{8}[/tex]. (Click all that apply)
[tex]\frac{2}{6}[/tex]
[tex]\frac{8}{16}[/tex]
[tex]\frac{1}{2}[/tex]
[tex]\frac{3}{6}[/tex]
[tex]\frac{5}{10}[/tex]
[tex]\frac{7}{11}[/tex]
I really badly need to know this soon!
Answer: 8/16, 1/2, 3/6, and 5/10.
Step-by-step explanation:
4/8 simplified is 1/2, so if you simplify all the fractions, you will get the results I listed in the answer.
(3^2-8) + 4 =
(complete equation in image plz help)
Answer:
5
Step-by-step explanation:
3^2 = 3 x 3 = 9
( 3^2 - 8 ) + 4
= 9 - 8 + 4
= 1 + 4
= 5
Answer:
(3^2-8) + 4 = 5
Step to step explanation:
(3^2-8) + 4 (3^2 = 3 x 3)
(9 - 8) + 4
1 + 4
= 5
Hope this helps :)!
When a flash of lightning occurs, the number of seconds elapsed until thunder is heard can be used to approximate the distance from the storm. The graph models this situation. Which equation can be used to approximate the distance from a storm, y , in miles, given the number of seconds, x , that has elapsed from the moment that a flash of lightning is seen to the time thunder is heard?
The cost of the fabric is $1.31. What would you expect to pay for a similar piece of fabric that is 18 inches by 42 inches?
Answer: Calculate areas for 2 rectangles;
21*9= 189
18*42= 756
make an equation with data you have;
If 189 cost $1.31
756 cost $x
____________
756 *1.31 / 189 = $5.24 cost for second fabric
Second way;
(18x42) / (21x9) = 4 x 1.31 = $5.24
Help its for tomorrow
Answer:
sorry cant help...if you have any math you need help with I could solve that.
Use the steps below to answer questions 4-5.
Step 1: 2/3 (15a+27b+9a-12a)
Step 2:10a+18b+6a-8a
Step 3:10a+18b+(6a-8a)
Step 4: 8a + 18b
4.Which property below is used between Steps 1 and 2?
5.Which property below is used between Steps 2 and 3?
17 is 50% of what number?
Answer: 34
Step-by-step explanation:
therefore, the answer to "17 is 50 percent of what number?" is 34, and you can also derive that 50 percent of 34 equals 17
Answer:
34
Step-by-step explanation:
This is a fairly simple problem. If 17 is 50% of something, that means it's half of something. That means to multiply 17 times 2, and you get 34.
Lena baked 16 cookies with 2 scoops of flour. How many scoops of flour does Lena need in order to bake 32 cookies? Solve using unit rates.
Answer:
4
Step-by-step explanation:
can someone help my sister with this? i don't really know how to help her so she can understand...
Answer:
43a) -2
43b) 42
43c) -3.4
Step to step explanation:
43a) Look at the middle
43b) 17 - (-25) = 42
43c) add all and then divide by 7 to get -3.4
(Im not to sure bout the last one but the others im sure. But u hope this helps <3)
Answer: Not sure exactly cause im struggling to see but..
43a) is -3
43b) is 17
43c) is 12
Im not sure if this is right but im think it is (/ >_</)
helpppppppppppppppppp im doing a 8th grade benchmark
Answer:
800
Step-by-step explanation:
Answer:
It would be 8x10^-2
x = -2
Step-by-step explanation:
Marcus wants to use the Distributive Property to rewrite 28+72. Which expression could he use?
Need a B in math by Thursday HELPP PLEASE
what is -0.75 - 0.4 simplified
Answer:
= -0.75-0.4
= -1.15
Step By Step
The simplified result of -0.75 - 0.4 is -1.15.
To simplify the expression -0.75 - 0.4
Step 1: Start by subtracting the decimals without considering the signs: 0.75 - 0.4 = 0.35.
Step 2: Now, remember that the original expression had a negative sign in front of it, so the final answer needs to be negative. Since we already calculated a positive value (0.35), we'll make it negative by adding the negative sign: -0.35.
Step 3: Finally, we need to subtract the whole number parts. -0 (whole number part of -0.75) - 0 (whole number part of -0.35) = 0.
Putting it all together, we have -0 - 0.35 = -0.35.
But remember, the original expression had a negative sign, so the final result is -(-0.35), which simplifies to -0.35.
In mathematical terms, -0.75 - 0.4 = -0 - (0.75 - 0.4) = -0 - 0.35 = -0.35.
So, the simplified answer is -0.35, which can also be written as -1.15 (since -0.35 = -1.00 + 0.15).
In summary, when you subtract -0.4 from -0.75, you get -0.35 or -1.15, depending on how you choose to express it.
To know more about Expression here
https://brainly.com/question/3497654
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(Someone please help asap!) Plot the x- and y-intercepts to graph the equation.
y = 1/3x −1
Answer:
2
Step-by-step explanation:
2