Answer:
The atomic model started out as a large single ball, then with electrons attached to it. It then became "planetary model" with electrons orbiting at specific levels, and then later one with a nucleus or multiple different particles like protons and neutrons, and electrons orbiting at general (but not specifically predictable) areas.
Explanation:
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Science
0.00098 I need that converted to the scientific notation I need help quick
Answer:
9.8×10^-4...... is the answer
I have science exam tomorrow plz guys help meh!!!
Differentiate between : Physical change and chemical change
Answer:
chemical change is a where a variation occurs when several reactants are combined or mixed together.
physical change is a process whereby you gain or lose energy as you cool or heat it.
Explanation:
what is potential energy
Answer:
The energy possessed by a body by virtue of its position relative to others, stresses within itself, electric charge, and other factors.
so simple question.
Answer:
Potential energy is stored energy that an object has because of its position.
Explanation:
Consider an example where a ball is thrown from a tall building. The point at which the ball is at its maximum height is said to have the maximum potential energy. As the ball gradually falls down, the potential energy decreases and turns into another form of energy, kinetic energy (energy in the form of motion). The ball at its peak position had stored energy, however, as soon as it begins moving, the stored energy will become less.
You can think of it this way where the ball has less and less distance to cover when falling downwards from the building. This shorter distance covered by the ball is proportional to the potential energy, so when the ball is about to hit the ground, the potential energy will be close to 0.
I hope this makes more sense!
what is the empirical formula of compound that is 64,8%,13,6%H and 21,6% O by mass?
Explanation:
Calculate the empirical formula. In any empirical formula problem you must first find the mass % of the elements in the compound. ... Then change the % to grams. ... Next, divide all the masses by their respective molar masses. ... Pick the smallest answer of moles and divide all figures by that.Please help me with this chemistry
Answer: gasoline, water, sea water, chloroform and mercury so B
Explanation:
What device will you use to determine the volume of a liquid?
O Balance
Metric beaker
O Graduated cylinder
O Flask
Answer:
graduated cylinder
what is single and double displacement reaction?
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What is the functional group of a carboxylic acid?
A. Carbon double bonded to oxygen and a hydroxyl group (OH).
B. Carbon bonded to a hydroxyl group (OH).
C
C. Carbon bonded to a nitrogen group.
D. Carbon double bonded to an oxygen and a hydrogen.
Answer:
A. Carbon double bonded to oxygen and a hydroxyl group (OH).
What is the density of water (in g/mL) to fouf significant figures at 6°C?
Answer :
0.9999432 g/cm^3
The density of water in g/ml up to 4 significant figures at 6°C is 0.9999432 g/cm³.
What are significant figures?Significant figures are used for establishment of a number which is presented in the form of digits. These digits give a meaningful representation to the numbers.
The significant figures are the significant digits which convey the meaning according to the accuracy. These provide precision to the numbers and hence are called as significant numbers.There are rules for counting significant figures which are as follows:
1)All non-zero digits are significant .
2)All zeroes which occur between non-zero digits are significant.
3)All zeroes to the left and right of a non-zero digit are not significant.
4) All zeroes on right of decimal are significant if a non-zero number follows them.
5)All zeroes on right side of non-zero digit are significant
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Which elements would react most easily with each other? (1 point)
an element with a high electronegativity and an element with a full shell of electrons
an element with a high electronegativity and an element with a single valence electron
an element with a high electronegativity and a second element with a high electronegativity
an element with a high electronegativity and an element with low reactivity
Answer: an element with a high electronegativity and an element with a single valence electron
is the correct answer
_______________________________________________________
Answer:
"Any element with a high electronegativity and an element with a single valence electron would react very easily on contact with each other."_______________________________________________________
"Why?"
For instance, fluorine is the most reactive non-metal element on the periodic table. Due to it's small size, as well as it's strong electronegativity, fluorine has a strong tendency to accept electrons from other atoms and ions. But when Fluorine comes in contact with Hydrogen (a single valence electron element), for instance, it immediately reacts, resulting in an explosion.
_______________________________________________________
Hope this helps!
What is the change of state in which a gas becomes a liquid?
Answer:
Condensation
Explanation:
Answer:
Condensation
Explanation:
When a gas changes to a liquid it is known as condensation. It happens when molecules in a gas slowly reduce their movement speed.
HOPE THIS HELPED
What is the Color of trioxonitrate
Answer:
blue white green and brownn
Explanation:
seen one
• 3. You have a rock with a volume of 15cm3 and a mass of 45 g. What is its
density? 3000 kg/m3
Answer: d=2.165 g/cm3
Explanation:Due to the nature of it being cubed we can calculate such equation with the mass being 45 grams in which we get 2.165 grams per cenimeter cubed
what sound is produced when lithium react with water?
Answer:
lithium reacts with water, forming lithium hydroxide and highly flammable hydrogen
Come up with 2 examples of derived units from everyday life.
Answer:
answer
Explanation:
Area : Square Meters,
Volume : Cubic Meters,
Density : Kilograms per Meter Cube,
Velocity : Meters per Second Squared,
Force : Newtons (Mass multiplied by Acceleration or Mass multiplied by Displacement divided by Time squared)…..
777 Joules of energy are applied to 25.0 grams of each of the following materials, which
will change temperature the most?
iron, glass, aluminum, copper, gold
Answer:
I think copper
Explanation:
Material IACS % Conductivity
Silver 105
Copper 100
Gold 70
Aluminum 61
Nickel 22
Zinc 27
Brass 28
Iron 17
Tin 15
Phosphor Bronze 15
Lead 7
Nickel Aluminum Bronze 7
Steel 3 to 15
the table might help- your indian brother
5.
Flow chart related to the ionic bond in sodium chloride
An ionic bond is formed between sodium and chlorine in sodium chloride. The correct flow chart is shown below.
The question is incomplete, the complete question is;
Complete the flow chart related to the ionic bond in sodium chloride-Atomic number,Electronic configuration of atoms,Electronic configuration of ion,Symbol of sodium ion .please help me to find the answer
The flow chart related to the ionic bond in sodium chloride is as follows;
Atomic number of sodium ----> 11Atomic number of chlorine ------> 17Electronic configuration of sodium; 1s2 2s2 2p6 3s1Electronic configuration of chlorine; 1s2 2s2 2p6 3s2 3p5Electronic configuration of sodium ion; 1s2 2s2 2p6Electronic configuration of chlorine ion; 1s2 2s2 2p6 3s2 3p6Symbol of sodium ion; [tex]Na^+[/tex]Sodium is in group 1 of the periodic table. It contains 11 electrons as shown by its electronic configuration. It forms sodium ion by loss of one electron. Group 1 elements form an univalent positive ion.
Chlorine is in group 17 of the periodic table. It has 17 electrons. It forms chloride ion by gaining one electron leading to the formation of sodium chloride.
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Find the density of mercury if 205 mL has a mass of 2790 g; round
your answer to the nearest 0.1 g/mL.
Answer:
D= m/ V
D = density of mercury , m= mass , V= Volume
D = 2790 / 205
D = 13.6 g/ml
D = 1.36 ×10-¹ g/ml
I hope I helped you^_^
PLS HELP. DUE TODAY.
1. T or F? All protons in an element contain an identical number of neutrons.
2. An atom with a _____ charge has the same number of protons and electrons.
Answer:
1. falseno all protons in an element doesn't contain an identical number of neutrons . number of electrons and number of protons contain identical number but the number of neutrons may vary. for eg: protons and neutrons of hydrogen is 1 and 0 respectively whereas protons and neutrons of helium is 2 and 2 .
2.neutral chargepls
answer
pls
pls
its ma homework
Answer:
2 ka A. nitrogen, oxygen, Carbon dioxide
Answer:
no 1 Ans gas
hope it works
Which statement describes a numerical result with good precision?
Answer:
poop
Explanation:
Name one real things modles represent
Answer:
objects or systems
Explanation:
I hope this helps
Describe two ways you could model atoms in a substance.
Answer:
You can model a substance doing a Lewis structure
And also you can model it doing a bond-line structure.
2. Your school club sold 600 tickets to a chili supper. The chili recipe for 10 persons
requires 2 teaspoons of chili powder. How many teaspoons of chili powder will you
need altogether?
Answer: 120 Teaspoons
Explanation:
TS = Teaspoons; R = Recipe ; S=Servings
(2 TS/R)/(10S/R) = (10S/2TS)
(600S)/(10S/2TS) = 120 TS
The graph below shows the changes in the temperature of ice when it is heated from -20 °C to 100 °C.
Heat curve for ice. The graph shows the changes in the temperature of ice when it is heated from negative 20 degrees Celsius to 100 degrees Celsius. The label for the x-axis reads 'Addition of heat over time.' The label for the y-axis reads 'Temperature (degrees Celsius).' There are labels on the graph (from 'A' to 'E') that designate significant events while applying heat to the ice. Portion AB has a slight incline while increasing the heat from negative 20 degrees to 5 degrees; portion BC stays at 5 degrees for a while; portion CD steadily increases in temperature from 5 degrees to 100 degrees over a significant period of time; portion DE stays at 100 degrees for a while.
Based on the graph, which of these conclusions is correct?
Answer:
D
Explanation:
I did it on a quiz.
Which of the following describes what a scientist does?
A. A scientist answers ethical questions.
B. A scientist asks questions about the world.
O C. A scientist determines right from wrong.
D. A scientist tells people how they should behave.
Answer:
B
Explanation:
Which phrase best describes a period on the periodic table?
a. elements that are in the same group
b. elements that have the same number of electrons
c. a column of elements
d. a row of elements
Answer:
d. a row of elements
Explanation:
Elements that are in the same group, have same number of electrons and make up a column in a periodic table.
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The phrase which best describes a period on the periodic table is; a row of elements.
The elements in the periodic table are divided into rows and columns. The rows are called the periods while the columns are called the groups.
This means that a period is best described as a row of elements from the foregoing.
Therefore, the correct answer is option D: a row of elements.
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What best describes what the pH number indicates about a solution?
O A. How acidic the solution is
B. What its ionic strength is
O C. How strong the acid is
O D. What the Ka constant is
Answer:
A. How Acidic the solution is
Explanation: pH is a measure of how acidic/basic water is. The range goes from 0 - 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base.
Answer:
A
Explanation:
The pH of a solution indicates it's acidity or alkalinity. The pH scale is an inverse logarithm that ranges from 0 to 14. Anything below 7.0 (ranging from 0.0 to 6.9) is acidic and anything above 7.0 ( from 7.1 to 14. 0) is basic or alkaline.
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giải gấp giúp em câu này với ạ:
a) Hoàn thành các phan ứng sau dưới dạng phương trình phân tử và phương trình ion thu gọn:
- CaCO3 + HCl =>
- Fe(SO4)3 + NaOH =>
- KCl + ? => KNO3 + ?
- Na2S + H2SO4 =>
b) Viết PTPU của các phương trình ion thu gọn sau, xác định chất nào là acid, chất nào là bazo:
- H(+) + OH(-) => H2O
- OH(-) + HCO3(-) => CO3(2-) + H20
Explanation:
what do you have written I can't understand one word right a properly
How many milliliters are there in 1.0 microliter?
Answer:
0.001
Explanation: