Answer:
I believe its the last one
Explanation:
The gold-foil experiment showed that the atom consists of a small, massive, positively charged nucleus with the negatively charged electrons being at a great distance from the centre. Niels Bohr built upon Rutherford's model to make his own.
Someone plz help me ;-;
Answer:
the events of the story
Explanation:
hope this helps
What is the number of nitrogen molecules in 6.0 moles of N2?
Explanation:
just take the given moles and multiply it with the ratio of molecules to moles to get your answer
The number of nitrogen molecules in 6.0 moles of N2 is = 3.6 × 10²⁴
How to calculate number of moleculesAvogadro's number( 6.02 × 10²³) is equal to the number of molecules in 1 mole of substance.
That is,
1 mole of N2 = 6.02 × 10²³
6 moles of N2 = 6 × 6.02 × 10²³
= 36.12 × 10²³
= 3.6 × 10²⁴
Therefore, the number of nitrogen molecules in 6.0 moles of N2 is = 3.6 × 10²⁴
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what is called the quantity which can be measured ?federal
A unit of measurement is a definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of quantity. Any other quantity of that kind can be expressed as a multiple of the unit of measurement. For example, a length is a physical quantity.
Please help it’s worth a lot!! I need the answer ASAP!!
Answer:
Show me the previous question so I can help
If you wanted to find the chemical element of an atom, you would need to...
a. know how many electrons it has
b. know how many protons it has
c. know its melting temperature
d. see it with a microscope
Answer:
Know how many electrons it has
If you wanted to find the chemical element of an atom, you would need to know how many electrons it has. So the correct option is A.
What is a chemical element?Any compound that cannot be broken down into simpler chemicals by regular chemical processes is referred to as a chemical element or element. The building blocks of which all matter is made are called elements.
There are 118 chemical elements that are currently recognized. About 20% of them have only been created synthetically in the lab and are only known because they do not exist in nature or are only present in trace levels.
Of the known elements, 11 are gases under normal circumstances (hydrogen, nitrogen, oxygen, fluorine, chlorine, and the six noble gases), 2 are liquids (two more, cesium and gallium, melt at slightly above or around room temperature), and the remaining 7 are solids.
Compounds are made of a number of more complex substances that are formed when elements mix with one another. Nearly all conceivable compounds have been found, and there are likely millions more that have yet to be identified.
When two or more elements come together to create a compound, they lose their individual identities and the resultant substance exhibits properties that are very different from those of the original constituents.
Therefore the correct option is A
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Which piece of glassware is cone shaped (rest of question on image)
Glasswares are glass containers and objects. An Erlenmeyer flask is a piece of glassware that is cone-shaped except for a cylinder-shaped opening. Thus, option B is correct.
What is Erlenmeyer flask?Erlenmeyer flask has been commonly called titration or conical flask used in the laboratory to titrate the solution in an experiment. It was named after Emil Erlenmeyer, a German chemist. They are used to heat, cool, mix, titrate, and incubate processes.
They have a distinct shape with a round flat bottom and a narrow neck region that allows swirling and mixing of the solution without any spills. Its narrow opening accommodates the filter funnel that can be used for filtration.
Therefore, option B. Erlenmeyer flask (conical flask) is cone-shaped glassware.
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4. Write the electronic configuration of first 20 elements in the periodic table.
Hydrogen: 1
Helium: 2
Lithium: 2•1
Beryllium:2•2
Boron: 2•3
Carbon: 2•4
Nitrogen:2•5
Oxygen:2•6
Fluorine: 2•7
Neon:2•8
Sodium: 2•8•1
Magnesium: 2•8•2
Aluminium: 2•8•3
Silicon: 2•8•4
Phosphorus: 2•8•5
Sulfur: 2•8•6
Chlorine: 2•8•7
Argon: 2•8•8
Potassium: 2•8•8•1
Calcium: 2•8•8•2
Please give me brainliest, I spent a lot of time doing this
Lavoisier made an important contribution to chemistry by _____.
developing the atomic theory of matter
developing the law of conservation of matter
developing the law of multiple proportions
coining the term "atom"
Answer:
developing the atomic theory of matter
Explanation:
100g of radioactive mass has a half life of 5 days. Calculate the mass decayed off after 15 days
Answer:
12.5 gm
Explanation:
15 days is three half lives
100 * (1/2)^3 = 12.5 grams
A 147g piece of metal has a density of 7.00g/mL. A 50mL graduated cylinder contains 20.0mL of water. What is the final volume after the metal is added to the graduated cylinder
Answer: 41.0 ml
Explanation: (147g/7.00g/ml) = 21.0 ml for the metal
Add to 20.0ml to reach 41.0 ml to 3 sig figs
Convert the following:
1.
25.4 centimeters________ ??
millimeters
2.
53 millimeters ________ ??centimeters
Answer:
1. 254 milli
2. 5.3 centi
Explanation:
254 milli = 25.4 centi
53 milli = 5.3 centi
What are the 2 characteristics of all matter
1. What are they key characteristics scientists look for to figure of it something is real science or pseudoscience?
2. What are the five main steps in the scientific method?
3.What is a physical property?
4. What are the two types of physical properties?
Answer:
Among these warning signs are: A tendency to invoke ad hoc hypotheses, which can be thought of as “escape hatches” or loopholes, as a means of immunizing claims from falsification. An absence of self-correction and an accompanying intellectual stagnation. An emphasis on confirmation rather than refutation.oMake an observation.Ask a question.Form a hypothesis, or testable explanation.Make a prediction based on the hypothesis.Test the prediction.Iterate: use the results to make new hypotheses or predictions.3. A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance
4.extensive and intensive properties.
PLEASE MARK ME BRAINLIESTa molecule of an element is called what?
Answer:
a molecule of an element is called atomicity
Q. Calculate the number of atoms in each of the following (i) 52 moles of Ar (ii) 52 u of He (iii) 52 g of He
The number of atoms will be 3.131 x [tex]10^{25}[/tex], 7.8286 x [tex]10^{24[/tex], and 7.8286 x [tex]10^{24[/tex] atoms respectively.
Number of atomsThere are 6.022 x [tex]10^{23}[/tex] atoms in 1 mole of every substance.
52 moles of Ar will contain 52 x 6.022 x [tex]10^{23}[/tex] = 3.131 x [tex]10^{25}[/tex] atoms
52 u of He = 52/4 = 13 moles of He.
13 moles of he = 13 x 6.022 x [tex]10^{23}[/tex] = 7.8286 x [tex]10^{24[/tex] atoms
52 g of He = 52/4 = 13 moles of He.
13 moles of he = 13 x 6.022 x [tex]10^{23}[/tex] = 7.8286 x [tex]10^{24[/tex] atoms
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1. The number of atoms in 52 mole of Ar is 3.13×10²⁵ atoms
2. The number of atoms in 52 u of He is 7.83×10²⁴ atoms
3. The number of atoms in 52 g of He is 7.83×10²⁴ atoms
Avogadro's hypothesis1 mole of substance = 6.02×10²³ atoms
1. How to determine the number of atoms in 52 mole of Ar1 mole of Ar = 6.02×10²³ atoms
Therefore,
52 mole of Ar = 52 × 6.02×10²³
52 mole of Ar = 3.13×10²⁵ atoms
2. How to determine the number of atoms in 52 u of He4 u of He = 1 mole
Thus,
52 u of He = 52 / 4
52 u of He = 13 moles
From Avogadro's hypothesis,
1 mole of He = 6.02×10²³ atoms
Therefore,
13 moles of He = 13 × 6.02×10²³
13 moles of He = 7.83×10²⁴ atoms
Thus,
52 u of He = 7.83×10²⁴ atoms
3. How to determine the number of atoms in 52 g of He4 g of He = 1 mole
Thus,
52 g of He = 52 / 4
52 g of He = 13 moles
From Avogadro's hypothesis,
1 mole of He = 6.02×10²³ atoms
Therefore,
13 moles of He = 13 × 6.02×10²³
13 moles of He = 7.83×10²⁴ atoms
Thus,
52 g of He = 7.83×10²⁴ atoms
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arlon drank 500 mL of softdrink which had a mass of 450 g.
a. 1.11 g/mL c. 0.9 g/mL
b. 50 g/mL d. 225000 g/mL
Answer:
0.9 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]d = \frac{m}{v} \\ [/tex]
where
m is the mass
v is the volume of object
From the question we have
m = 450 g
v = 500 ml
[tex]d = \frac{450}{500} = \frac{9}{10} \\ = 0.9[/tex]
We have the final answer as
0.9 g/mLHope this helps you
Answer:
B) g/mL
Explanation:
Mass of Oxalic acid (solute) = 11g
Mass of Solution = 500ml
Density = 1.1 g/ml
We know that
Mass % of solute =
Massofsolution
Massofsolute×100
×
50
Mass of solution =
Volume of solution×
Density of solution
Mass of solution =
500×
1.1=
50×
11g
Mass % of the solute =
11×50
11×100
=
2%
Match the event with the type of change.
a. Making ice cubes from water
b. Making hot water for tea
c. Using dry ice to create a foggy punch bowl
а
<
1. Changes Between Liquids and Solids
2. Changes Between Liquids and Gases
3. Changes Between Solids and Gases
a
<
av
Answer:
A-1,
B-2,
C-3 is the answer of this queation
1. What is Science?
A. The goal of science is to investigate and understand the natural world, to explain events in the natural
world, and to use those explanations to make useful predictions.
How does the formula of an element differ from that of a compound?
Answer: Most elements don't have formulas.
Explanation: They exist as single atoms, witn no bonds to another atom. A few element do exist as molecules, such as )2 and N2, but they are bonded to the same atom. There are no different elements.
sorry for asking for too much but me needs helppppp
Answer:
physical
Explanation:
Answer:
Physical property
Explanation:
A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. Physical properties include color, density, hardness, and melting and boiling points. A chemical property describes the ability of a substance to undergo a specific chemical change.
What are three properties of inertia?
formation of bubbles can be associated with physical changes under certain contexts. provide examples of specific substances and describe the situations in which bubbles form during a physical change and a chemical change.
The neutrons affect the stability of the nucleus of the atom. True or False
Answer:
True.
Explanation:
This is because when the number of protons in the nucleus increases the neutrons needed for a stable nucleus increases even more rapidly.
Best of luck!!!
Why does magnesium chloride need to be molten in electrolysis
Answer:
this is from another brainliest answers.
Explanation:
Ionic compounds need to be molten or in solution for electrolysis to work. This is because the charged particles that make them up (ions) need to be free to move to the electrodes.
what happens when tin II chloride is reacted with iron III sulphate
Answer:
it changes from Lower temperature to higher temperature
Use the information from the diagram to calculate the enthalpy of combustion for methane.
(IGNORE MY ANSWER PLZ I ACCIDENTALLY CLICKED IT)
SOMEBODY PLZ HELP ME I REALLY NEED IT PLZZZZZZZZ
Answer:
The answer is A) -604KJ
Explanation:
I just took the Penn Foster test. =D you welcome!
Help me with physical science
Answer:ok
Explanation:fish
PLS I NEED HELP
The distance from the Sun to Mercury is 3.598 • 10^7
miles. The distance from the Sun to Neptune is
2.798. 10^9 miles. How far is Mercury from Neptune?
Write your answer in scientific notation.
Answer:
4.44309 × 109 ( 4443090000 kilometres )
2.760936126 × 109 ( 2760936126 miles)
Please make me the brainliest! !!
Answer:
The distance of Mercury to Neptune = The distance from sun to Neptune - The distance from sun to Mercury
= 2.798 . 10^9 - 3.598 . 10^7
= 2.798 . 10^9 - 0.03598 . 10^9
= 10^9 ( 2.798 - 0.03598 )
= 2.76202 . 10^9 miles
.
.
Hope it helps
. Restate What is a physical change in terms
of particle arrangement?
Answer:
In physical changes no new materials are formed and the particles do not change apart from gaining or losing energy
Explanation:
You are given 2 balls that are made of the same material. They are also the same size and color. One is hollow and one is solid. Determine the physical property that could be used to identify the ball as a solid.
Group of answer choices
boiling point
solubility
pH
density
Answer:density
Explanation:
it’s how’s how dens the ball is
