Answer:
1) The volume occupied by an atom is composed of mainly empty space
2) Atoms have a very small, relatively dense, central nucleus that is positively charged
3) The region around the nucleus of an atom are orbited by negatively charged electrons in a the same fashion planets orbit around the Sun.
Explanation:
The selection of gold for the gold foil experiment was due to its ability to be rolled into extremely thin sheets such that it was expected for alpha particle to perforate or pass through the foil.
What are easy ways to
Study Chemistry ??
Answer:
seneca
past papers
take notes from videos
Explanation:
very good website, asks questions about the subject correct for your exam board and gives correct answers and explanations
exam papers always help
What is occurring during boiling?
A. Solvent particles increase in kinetic energy until they knock solute particles out of the solution and into the air.
B. Solute particles increase in kinetic energy until they knock solvent particles out of the solution and into the air.
C. Vapor pressure is greater than atmospheric pressure and water molecules escape from the solution into the air.
D. Atmospheric pressure is greater than vapor pressure, and water molecules escape from the solution into the air.
Reset Selection
Answer:
D: Atmospheric pressure is greater than vapor pressure,and water molecules escape from the solution into the air.
Atmospheric pressure is greater than vapor pressure, and water molecules escape from the solution into the air, which occurs during boiling. The correct option is D.
What is boiling?Boiling is a process when more heat is given to any liquid, it starts to boil. When the temperature is increased, boiling happens, but only in liquid. The molecules of liquid start to turn into vapor and start to escape into the atmosphere.
It is also called the vaporization of the liquid. The boiling points of different liquids are different, and they start to boil at their own temperature.
Thus, the correct option is D. Water molecules escape from the solution into the air when atmospheric pressure exceeds vapor pressure.
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What name is given to a non-metal when it forms an ion, and what type of charge does it have?
Answer:
Anions name is given to a non-metal when it forms an ion, and it has negative charge.
Answer:
Non metals form negative ions and negatively charged ions are called anions.
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Levi decides to examine the effect of fertilizer on the growth of tomato plants. He chooses four plants for his experiment and applies varying amounts of fertilizer to three of them. He does not apply fertilizer to one plant. Over a 15-day period, the plants receive fertilizer on Days 1, 4, 7, 10, and 13. Levi measures the height of all of his plants with a meter stick on days 3, 6, 9, 12, and 15. He also makes sure to hold all experimental factors constant except for the fertilizer.
Where should the independent and dependent variables of Levi's experiment be placed when graphed?
Select all that apply.
the amount of fertilizer;y-axis
plant height;x-axis
the amount of fertilizer;x-axis
plant height; y-axis
Answer:
the amount of fertilizer; x-axis
plant height; y-axis
Explanation:
The independent and dependent variables of Levi's experiment placed when graphed are the amount of fertilizer and the y-axis. Option B is correct.
What are independent and dependent variables?The independent variables are those which are not dependent on other factors for their working or cannot be influenced by any other factor and the dependent variable is just the opposite of this one.
The experiment depends on the height of the plant but the fertilizer is independent of to work of the plant and fertilizer is independent and high and depends on other factors.
Therefore, Option B is correct. independent and dependent variables of Levi's experiment placed when graphed are the amount of fertilizer and the y-axis.
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career in chemistry list ten
Explanation:
Chemistry Teacher.
Chemical Engineer.
Forensic Scientist.
Geochemist.
Biochemists
Pharmacologist
Analytical Chemist
Envionmental chemist
Water Chemist
Catalysis
Question 4 of 20:
Select the best answer for the question
4. Which of the following is a design theory from the 1980s that uses mathematics to guide computer-aided design
O A. C-K Theory
O B. General Design Theory
O C. ASE
O D. TRIZ
general design theory
It is, general design theory introduced in 1980s that uses mathematics to guide computer - aided design. Hence, option B is correct.
What is general design theory ?A variety of new design theories were developed in the 1980s as a result of technology developments like computer-aided design (CAD). The 1981 article "General design theory and a CAD system" by Hiroyuki Yoshikawa contains one of the early references to GDT.
Yoshikawa's theory "ultimately aims at elucidating the human capacity for designing in a scientific fashion, while simultaneously producing the practical information about design technique.
Many different approaches and interpretations of design theory have been made, ranging from personal statements of design principles made by designers, to philosophical conceptions of design, to a search for a design science using advanced mathematics. Hence, option B is correct.
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How many molecules of sodium oxide will be created if 275 grams of sodium reacts with excess oxygen? Given the equation: 4Na + O2 -> 2Na2O
Answer:
3.60 x 10^24 molecules Na2O
Explanation:
Explain why the reaction between lead oxide and carbon is called a redox reaction.....
Answer:
Explanation:
It's called a Redbox reaction because when a change in oxidation number occurs in a reaction, with both an increase in number and a decrease in number, then the reaction is classified as redox. If this doesn't occur, then the reaction is non- redox.
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c. CaCl2 can be melted to produce calcium metal and give off chlorine gas. The equation for this
is CaCl2()→ Ca(s) + Cl2(g). If 277.45 g CaCl2 were melted, how many grams of Ca(s) would
be formed? (10 points)
HELP MEEEEE PLEASE
Answer:
Total gram of Ca = 99.26 g
Explanation:
Given:
Mass of CaCl₂ = 277.45 g
Find:
Mass of Ca
Computation:
Ca = 40 g/mol
Cl₂ = 2 (35.5) g/mol = 71 g/mol
Total CaCl₂ = 111 g/mol
Total gram of Ca = [40 / 111] 277.45 g
Total gram of Ca = 99.26 g
what is plasma in chemistry
Explanation:
Plasma is an ionized gas, a distinct fourth state of matter. “Ionized” means that at least one electron is not bound to an atom or molecule, converting the atoms or molecules into positively charged ions.but plasma is present in human body too in a liquid form.
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best way to separate a solid from a liquid what separation technique is needed
Answer:
Filtiration technique
Explanation:
Answer the question in attachment and can I ask from which country you are.
I am new on this app.
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Answer:
1: exothermic
2:hydrated iron (III) oxide
3:reactants
4:precipitate
5: hydrogen gas
Answer:1.exothermic
2.hydrated iron (III) oxide
3.reactants
4.precipitate
5. hydrogen gas
what is filtration? ㅜㅜ ㅜㅜ
Answer:
filtration is the process of using a filter to remove solids from liquids or gasses.
Example:
an example of this is tea.
please help ASAP please!!
Answer:
If I am correct the last one because the pressure is decreasing and the temperature is increasing
Chromatography
separates a solution based
on differences in how its
components ________in
different phases of matter.
what are stop signs from barack Obama?
Answer:
President Obama signs the Stop Trading on Congressional Knowledge Act in a ceremony at the White House. President Barack Obama delivers remarks prior to signing the STOCK Act in the South Court Auditorium at the Eisenhower Executive Building (EEOB) of the... sorry I have to hurryy
Explanation:
18. If the pH of a strong acid solution is known to be 3.25, what is the [H+)?
(b) what is the pOH of this solution?
3. An atom
OF
elemente A has mass number 39 and 19 protons
Write the electron arrangement of the atom
Answer:
Explanation:
Potassium (K) atom has 19 electrons. The full electron configuration of Potassium (K) is 1s22s22p63s23p64s1
Principal energy level
Quantum number: n
1
2
3
4
5
6
Sublevels
availableQuantum number: l
1s
2s 2p
3s 3p 3d
4s 4p 4d 4f
5s 5p 5d 5f 5g
6s 6p 6d 6f 6g 6h
(30 points) alright so there’s this girl I’m ab to slide in her dms I just need a pickup line but nothing inappropriate bc I don’t like to slide in thirsty so if anyone has a completely hydrated cute pickup line help a simp out
Answer:
Are you a fruit, because honeydew you know how beautiful you look right now?
or maybe
I hear you’re good at algebra…..Will you replace my eX without asking Y?
or maybe
On a scale of one to ten you’re a nine… Because I’m the one left that you need.
Explanation:
Hope these help you.
Citrus fruits may taste sour because they are _____. acidic basic neutral too ripe
Answer:
A. acidic
Explanation:
Citrus fruits may taste sour because they are acidic. They have citric acid and ascorbic acids.
phương trình nào sau đây không đúng
Mg(OH)2 (t°)→ MgO+H2O
Fe(OH)2 (t°,chân không)→FeO+H2O
2Fe(OH)3 (t°)→Fe2O3+3H2O
2NaOH (t°)→Na2O+H2O
Phương trình NaOH sai nha
15. Sodium chloride is called an electrovalent compound whereas carbon dioxide is called covalent compound why?
Answer:
NaCl is an electrovalent compound because the sodium and chlorine atoms give one electron from their outermost shells to each other in order to complete their octets
Explanation:
Make me Brain liest plz );
Which are the physical properties of water
What is a base?
A. A substance that increases the concentration of oxygen in
solution
B. A substance that increases the concentration of OH ions in
solution
C. A substance that increases the concentration of H+ ions when dissolved
D. A substance that contributes chloride ions to the solution
Answer:
A base releases OH~ in a solution, so the answer is B
What happens when a chlorine atom gains an electron in its outer energy shell? A. It has an increase in the number of protons B. It becomes a negative ion C. It becomes a positive ion D. It has a decrease in the number of neutrons
Answer:
When a chlorine atom gains an electron, its outermost principal energy level achieves an octet. In this case, the ion has the same outermost shell as the original atom, but now that shell has eight electrons in it. Once again, the octet rule has been satisfied.
Explanation:
is a corroding metal a physical or chemical change?
Answer:
Corrosian is a chemical change
Explanation:
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Answer: broooo what is this
Explanation:
Find the density of a cube on Earth that weighs 1.5 kg and has a side-length of 10 cm.
Answer:
1500kg/m^3
Explanation:
Formula:
d=m/v
Given:
m=1.5kg
v=1000cm^3
(The side length of a cube is always equal to the others)
Required:
d=?
Solution:
d=m/v
d=1.5kg/1000cm^3
d=1.5kg/0.001m^3
d=1500kg/m^3
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In common speech, some people may use the terms hypothesis and theory interchangeably. In science, however, the terms have different meanings. What do you think is an important difference between a hypothesis and a theory?
Answer: In science, a hypothesis is a possible explanation for an observation, while a theory is an explanation that is supported by a large body of evidence.
Explanation: exact answer
3. why are fire tornadoes rare ?