Answer:
I think No
Explanation:
Which of the following best describes a hypothesis?
A. An explanation that is supported by scientific data
B. A proven explanation for experimental results
c. A possible answer to a scientific question
D. A question about the natural world
please help i will give brainliest
How many protons does a nitrogen atom have?
07
0 14
8
05
Answer:
07.
Explanation:
Answer:
7
Explanation:
We call these different isotopes of nitrogen. There are always 7 protons because the nucleus is always a nitrogen nucleus (Z=7). Since different isotopes of an element have different numbers of neutrons (but always the same number of protons) they have different mass numbers.
5)
Experiments with gold foil indicated that atoms
A)
usually have a uniform distribution of positive charges
B)
usually have a uniform distribution of negative charges
C)
contain a positively charged, dense center
D)
contain a negatively charged, dense center
Answer:
c
Explanation:
I just learned all this in chemistry too lol
got 100 on the test last week so its good
Experiments with gold foil indicated that atoms contain a positively charged, dense center and the correct option is option C.
Experiments with gold foil, known as the Rutherford gold foil experiment, were conducted by Ernest Rutherford in 1911. In this experiment, he bombarded a thin gold foil with alpha particles.
Most of the alpha particles passed through the foil with little deflection, but some of them were deflected at large angles, and a small fraction even bounced back. This observation led Rutherford to conclude that the atom contains a positively charged, dense center called the nucleus, where most of its mass is concentrated. He proposed the nuclear model of the atom, which became a significant advancement in the understanding of atomic structure.
Thus, the ideal selection is option C.
Learn more about Gold foil experiment, here:
https://brainly.com/question/33537458
#SPJ6
Niels Bohr’s model of the atom helped to explain
Answer:
a theory for the hydrogen atom based on quantum theory that energy is transferred only in certain well defined quantities. Electrons should move around the nucleus but only in prescribed orbits.
Explanation:
which process explains how rock that formed underground is now aboveground in sierra nevada
Answer:
formation process
Explanation:
farllon plate was fully subducted along pacific coast line
The cascade mountains formed from the igneous rocks by plate movement are younger and they are formed by the uplift of plates makes them appears aboveground in sierra Nevada.
What are cascade mountains in Sierra Nevada ?Since they were formed by melting above a subduction zone, the Cascades and Sierra Nevada's rocks are largely igneous. The Cascades, which initially arose 36 million years ago and are still forming now, are younger mountains.
In contrast, the Nevadan Orogeny, which occurred over 200 million years ago, is when the plutonic core of the Sierra Nevada started to form. When subducting at a sharp angle, oceanic lithosphere at the edge of the North American continent melted, and the magma surged back through the continental crust to form a volcanic arc.
The once-deep granite batholith that makes up today's Sierra Nevada was exposed by erosion after being raised by the North American plate. Although one small spur is located in Nevada, the elevated granitic intrusion is 640 kilometers long and largely located in California.
Find more on rocks in Sierra Nevada:
https://brainly.com/question/21856412
#SPJ3
Which of these is an example of chemical separation of a substance?
-Distillation
-Magnetism
-Paper Chromatography
-Bond breaking
Answer:
Bond broking
Explanation:
Bond broking.
Use the drop-down menus to select the sentences that show precise use of pronouns.
1. Fred visited Nick after his graduation.
2. After Nick's graduation, Fred visited him.
1. Marie told Sarah that she makes great spaghetti.
2. Marie told Sarah, "You make great spaghetti."
1. John broke the fence with his bike.
2. John's bike hit a fence and it broke.
Answers
Sentence 1
Sentence2
Answer:
sentence 2, sentence 2, sentence 1
Explanation:
it was right for me on edge 2020
Answer:
1. Fred visited Nick after his graduation.
2. After Nick's graduation, Fred visited him.
1. Marie told Sarah that she makes great spaghetti.
2. Marie told Sarah, "You make great spaghetti."
1. John broke the fence with his bike.
2. John's bike hit a fence and it broke.
Is vacuole a plant or animals cell
Answer:
plant
Explanation:
let me know if correct
Use the model to answer the question.
Which element symbol actually represents the model?
Plz answer
Answer:
B
Explanation:
Boron has 5 protons.
compare the size of F- and Na+ with atomic size of Neon?
Fluorine's atomic configuration is (2,7). As it's charge is -1, it will have 8 electrons in it's outermost shell thus filling its octate. similarly, Sodium loses one electron.
There you go :)
Please Help!!!
Which of the following is not a good indication that a chemical change has occurred?
A. The formation of gases
B. A change in color
C. A scratched surface
D. The release heat or light
Answer:
C.
Explanation:
A state property X has a value 89.6 units. It undergoes the following changes, first increase by
3.6 units, then increase by another 18.7 units, then decrease by 12.2 units and finally attains a
value of 85.5 units The value for this series of change is A) 14.2 units
B) -4.1 units C) 108.3 units
D) uncertain
Answer:
B) -4.1 units
Explanation:
According to this question, a state property X has a value 89.6 units. It undergoes the certain changes as follows:
- first increase by 3.6 units
- then increase by another 18.7 units
- then decrease by 12.2 units
- and finally attains a value of 85.5 units
This can be mathematically represented by 89.6 - {3.6 + 18.7 - 12.2 - x) = 85.5
To get x, we say;
89.6 + 3.6 = 93.2
93.2 + 18.7 = 111.9
111.9 - 12.2 = 99.7
99.7 - 85.5 = 14.2units.
The changes that occured is represented as follows:
= (3.6 + 18.7) - (12.2 + 14.2)
= 22.3 - 26.4
= -4.1 units
PLEASE HELP ME!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! You think that although there are some differences, the human nervous system is similar to a computer. You're friend says, "No way! A computer is just metal, wires, and plastic." Develop an argument that would persuade your friend that there are similarities between these two systems. Include specific examples and evidence to support your position.
Answer:
We have nerves that are just like wires that run through our body that tells us what is going on and what to do about it. The hard dive like in a computer is our brain, which is made up of three parts that control things like coordination, movement, involuntary, and voluntary movement. The sensory numerous just like the keys in a computer pick up what we are doing in life.
Explanation:
how do i caculate velocity
Answer:
Velocity Equation in these calculations:
Final velocity (v) of an object equals initial velocity (u) of that object plus acceleration (a) of the object times the elapsed time (t) from u to v.
Explanation:
Heat and temperature are related, but they are not the same thing. Heat is a form of
energy called thermal energy. Objects are composed of molecules, which move around.
When molecules gain energy, they move even more. Every object on Earth has thermal
energy. That's because even the molecules inside very cold objects are not perfectly still,
Temperature is a measure of the intensity of an object's thermal energy. It tells us the
average amount of thermal energy an object has. This is why a small hot object can have a
higher temperature but less thermal energy than a large cold object.
Based on the passage, an object with a lot of thermal energy
А
might be cold but very small
B
might be cold but very large.
is always large
is always small.
To quote the passage: "...a small hot object can have a
higher temperature but less thermal energy than a large cold object."
In other words, a small object can have a high average thermal energy, and therefore a high temperature, but since the object is smaller, the magnitude of thermal energy present in the object is by default less than that in the larger object. As the passage indicates, every object has thermal energy. So, despite the fact that the larger object is colder, it still has a greater thermal energy due to the number of molecules that comprise the larger object.
Answer:Based on the passage, an object with a lot of thermal energy might be cold but very large.
Which has kinetic energy?
Ob
a tank of gasoline
a moving car
a battery
Ос
Od
water in a reservoir
Answer:
a moving car
Explanation:
because The faster an object is moving, the more kinetic energy it has. Any object that is moving has kinetic energy – the moving object has energy because of its motion.
How many grams are equal to 0.11 mole of copper(I) chromate?
Mass of Copper(I) chromate( CuCrO₄) = 19.75 g
Further explanationThe mole is the number of particles contained in a substance
1 mol = 6.02.10²³
Moles can also be determined from the amount of substance mass and its molar mass
[tex]\tt \large{\boxed{\bold{mol=\dfrac{m(mass)}{MW(molecular~weight)}}}[/tex]
0.11 mole of Copper(I) chromate( CuCrO₄) ⇒ MW=179.54 g/mol, so mass :
[tex]\tt mass=mol\times MW\\\\mass=0.11\times 179.54\\\\mass=19.75~g[/tex]
calculate the ph of a solution whose(oh^-) is 4.583*10^-5 mole dm cube (pkw=14)
pH of solution = 9.661
Further explanationpH is the degree of acidity of a solution that depends on the concentration of H⁺ ions. The greater the value the more acidic the solution and the smaller the pH.
pH = - log [H⁺]
So that the two quantities between pH and [H⁺] are inversely proportional because they are associated with negative values.
pOH=-log[OH⁻]
[tex]\tt pOH=-log[4.583\times 10^{-5}]\\\\pOH=5-log~4.583=4.339[/tex]
pH+pOH=pKw
[tex]\tt pH=14-4.339\\\\pH=9.661[/tex]
What will happen to the flow of blood in blood vessels (pulse) if heart beat rate increase
Answer:
"Low levels of the hormone epinephrine, also called adrenaline, cause blood vessels to relax and widen. High levels of this same hormone, along with the hormone norepinephrine, cause the blood vessels to narrow and the heart rate to rise, increasing blood pressure."
Explanation:
Explain how the isotopes and ions of an atom differ.
Answer:
istopes is a situation in which each of two or more forms of same element that contain equal number of proton....while ions of an atoms are with extra electrons or missing electrons so they tends to differ
Please help me how do i solve this
Answer:120
Explanation:2gfdxxfgngfnf
what is atomic?................................................
Answer:
oh I'm here thanks for your points
Answer:
thanx for the points
Explanation:
What is the K-T boundary?
Answer:
Definition
The Cretaceous/Tertiary boundary (KT), also often called the Cretaceous/Paleogene (K/Pg) boundary, marks the contact between the Mesozoic and Cenozoic eras ∼ 65 Ma ago. The KT boundary is characterized by the last major mass extinction in Earth history that saw the demise of the non-avian dinosaurs along with 50% to 60% of the Earth fauna and flora.
Consider the reaction: 3 N2 (g) + 2 O3 (g) → 6 NO (g) ΔfH ° (kJ/mol) 0.00 142.26 90.37 Sm ° (J mol-1 K-1) 191.5 237.7 210.6 What is ΔrG ° for this reaction in kJ/mol at 350 K?
Answer:
Explanation:
3 N₂ (g) + 2 O₃ (g) → 6 NO (g)
Δ H(rxn ) = 90.37x 6 - ( 0 + 142.26 x 2 )
= 542.22 - 284.52
= 257.7 kJ
Δ S(rxn ) = 6 x 210.6 - ( 2 x 237.7 + 3 x 191.5 )
= 1263.6 - ( 475.4 + 574.5 )
= 213.7 J / K
Δ G = Δ H - T Δ S
= 257.7 - 350 x 213.7
= - 74537.3 kJ .
Δ G / mole = - 74537.3 / 6 = - 12422.88 kJ / mol.
2.
Which one of the following substances is a compound?
A. Hydrogen
B. Tron
C. Oxygen
D. Sodium fluoride
Explain your answer:
A chemistry teacher is able to grade chemistry labs at a rate of 5 labs for every 3 minutes. They need to grade 165 labs how many hours will it take?
Answer:
1.65hr
Explanation:
Given parameters:
Number of labs = 5 labs
Time taken = 3 minutes
Unknown:
Time taken in hours to grade 165 labs = ?
Solution:
Let us find the rate of the teacher;
Rate = [tex]\frac{number of labs}{time}[/tex]
Insert the parameters and solve;
Rate = [tex]\frac{5}{3}[/tex] = 1.67labs/min
Now;
Time to grade 165 labs = [tex]\frac{number of labs}{rate}[/tex]
Time to grade 165 labs = [tex]\frac{165}{1.67}[/tex] = 98.8min
Since;
60min = 1hr
98.8min = [tex]\frac{98.8}{60}[/tex] = 1.65hr
at least three everyday things that exist or occur because of science.
Answer:
1.A POWER DRILL COULD SET YOUR HOUSE ON FIRE, IN THEORY.
2.STICKY NOTES COME OFF EASILY BECAUSE THEIR ADHESIVE IS UNEVEN. ...
3.GUM IS CHEWY BECAUSE IT'S MADE OF RUBBER. ...
4.OFFICE BUILDINGS ARE EVER-SO-SLIGHTLY TALLER AT NIGHT. ...
5.A LEGO BRICK CAN SUPPORT 770 POUNDS OF FORCE. ...
6.POLISHING SHOES IS LIKE FILLING IN A ROAD'S POTHOLES.
Explanation:
Express in scientific notation. Choose the answer with the proper number of significant figures. 9x10^9/4.5x10^1
Answer:
Your answer should be 2.4 x 10^9. please hit the crown
Explanation:
The table above summarizes data given to a student to evaluate the type of change that took place when substance X was mixed with water. The student claimed that the data did not provide enough evidence
to determine whether a chemical or physical change took place and that additional tests were needed. Which of the following identifies the best way to gather evidence to support the type of change that
occurred when water and X were mixed?
The question is incomplete, the complete question is;
The table above summarizes data given to a student to evaluate the type of change that took place when substance X was mixed with water. The student claimed that the data did not provide enough evidence to determine whether a chemical or physical change took place and that additional tests were needed. Which of the following identifies the best way to gather evidence to support the type of change that occurred when water and Xwere mixed?
A. Measuring the melting point of the mixture of water and X
B. Adding another substance to the mixture of water and X to see whether a solid forms
C Measuring and comparing the masses of the water, X, and the mixture of water and X
D Measuring the electrical conductivities of X and the mixture of water and X
Answer:
D Measuring the electrical conductivities of X and the mixture of water and X
Explanation:
Unfortunately, I am unable to reproduce the table here. However, from the table, the temperature of the of the mixture of the solid X and water was 101.6°C. This is above the boiling point of water and way below the temperature of the solid X.
This goes a long way to suggest that there was some kind of interaction between the water and X which accounted for the observed temperature of the system of X in water.
The only way we can be able to confirm if X actually dissolved in water is to measure the conductivity of the water. dissolved solids increase the conductivity of water.
The statement which identifies the best way to gather evidence to support the type of change that occurred when water and X were mixed is:
D Measuring the electrical conductivities of X and the mixture of water and XAccording to the given question, we are asked to show the statement which identifies the best way to gather evidence to support the type of change that occurred when water and X were mixed. \
As a result of this, we can see that from the complete question, there is a need to note the temperature of the solution which is 101.6°C and then to measure the conductivity of the water to know for sure the type of change that occured.
Therefore, the correct answer is option D
Read more here:
https://brainly.com/question/18384031
The density of lead is 11.4g/cm3. What volume, in ft3, would be occupied by 10.0 g of lead?
Answer:
The volume is 3.09 ft^3.
Explanation:
The formula for volume is mass divided by density. 10.0 g / 11.4 g/cm^3 = 0.87719. Converted to cubis foot is 3.09 ft^3. I hope this helps you.