Answer: B
Explanation: A fluorine atom has nine protons and nine electrons, so it is electrically neutral. (neutral =0)
The nucleus of a fluorine atom has a charge of zero as the atom has equal number of positive and negative charges.
What is an atom?An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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un ejemplo de cambio físico ocurre cuando: a) horneamos pan dulce. b) endulzamos el agua de limón. c) freímos los huevos. d) tostados los granos de café.
Answer:
...
Explanation:
A certain amount of gas at 25°C and at a pressure of 0.800 atm is contained in a glass vessel. Suppose that the vessel can withstand a pressure of 2.00 atm. What is the maximum temperature in Kelvin that the gas can have without bursting the vessel?
a. 745 K
b. 62.5 K
c. 298 K
d. 760 K
The maximum temperature : a. 745 K
Further explanationGiven
Gas at 25°C(298 K) and at a pressure of 0.800 atm
Final pressure = 2 atm
Required
Final temperature
Solution
Gay Lussac's Law
When the volume is not changed, the gas pressure in the vessel is proportional to its absolute temperature
[tex]\tt \dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}[/tex]
Input the value :
T₂=(P₂T₁)/P₁
T₂=(2 atm x 298 K)/0.8 atm
T₂ = 745 K = 472 °C
6 Li + Zn3(PO4)2 ------- > 2 Li3PO4 + 3 Zn
If 48.6 g of zinc is made, how many moles of lithium phosphate are also made? _______ moles
Moles of Lithium phosphate : 0.495
Further explanationGiven
6 Li + Zn₃(PO₄)₂ ------- > 2 Li₃PO₄ + 3 Zn
Required
Moles of Lithium phosphate
Solution
moles of Zinc(Ar=65,38 g/mol) :
= mass : Ar
= 48.6 : 65.38
= 0.743
From equation, mol ratio of Zn : Li₃PO₄ = 3 : 2, so mol Li₃PO₄ :
= 2/3 x mol Zn
= 2/3 x 0.743
= 0.495
What volume will a gas occupy at 325 K if it occupies 5.8 L at 376 K? Assume the moles and pressure of gas are held constant
A) 2.89 L
B) 3.76 L
C) 5.01 L
D) 6.73 L
Answer:
5.01 L
Explanation:
my guy i just took the test, it was this one
Identify the reaction type shown and describe the clues that were used to identify it.
NH4NO3 → N2O + 2H2O
Answer:
This chemical equation represents a decomposition reaction. This identification is based on the fact that the single reactant chemical compound breaks down into two different chemical substances that are different from the initial chemical substance.
Explanation:
it was the sample response lol
A reactant is broken down into two or more products in the decomposition reaction. The given reaction is a decomposition reaction.
Decomposition reaction:
In this type of chemical reaction, a reactant is broken down into two or more products.
For example- Ammonium nitrate is broken down into nitrous oxide and water molecules.
[tex]\bold {NH_4NO_3 \rightarrow N_2O + 2H_2O}[/tex]
Therefore, the given reaction is a decomposition reaction.
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What is the percent yield of this reaction if 22.o g of Mgl2 is produced by the reaction of 25.0 g of Mg with 25.0 g of l2?
% yield = 80.719
Further explanationGiven
22.0 g of Mgl₂
25.0 g of Mg
25.0 g of l₂
Required
The percent yield
Solution
Reaction
Mg + I₂⇒ MgI₂
mol Mg = 25 g : 24.305 g/mol = 1.029
mol I₂ = 25 g : 253.809 g/mol = 0.098
Limiting reactant = I₂
Excess reactant = Mg
mol MgI₂ based on I₂, so mol MgI₂ = 0.098
Mass MgI₂ (theoretical):
= mol x MW
= 0.098 x 278.114
= 27.255 g
% yield = (actual/theoretical) x 100%
% yield = (22 / 27.255) x 100%
% yield = 80.719
Please I need help I can’t fail
What element has an energy level Electron Configuration of 2-8-18-8?
Argon
Calcium
Krypton
Chlorine
answer:
krypton.
explanation:
it is a noble gas, so has full-valence shell. also, reference back to the periodic table.
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Determine the final temperature of sample with a specific heat of 1.1 J/g°C and a mass of 385 g if it starts out at a temperature of 19.5°C and 885 J of energy are added to it.
Answer:
T2 =21.52°C
Explanation:
Given data:
Specific heat capacity of sample = 1.1 J/g.°C
Mass of sample = 385 g
Initial temperature = 19.5°C
Heat absorbed = 885 J
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = Final temperature - initial temperature
885J = 385 g× 1.1 J/g.°C×(T2 - 19.5°C )
885 J = 423.5 J/°C× (T2 - 19.5°C )
885 J / 423.5 J/°C = (T2 - 19.5°C )
2.02°C = (T2 - 19.5°C )
T2 = 2.02°C + 19.5°C
T2 =21.52°C
Calculate the molar mass of Li2SO4.
Answer:
109.94 g/mol
Explanation:
Li is 6.94 and there's 2 of those = 13.88
1 S = 32.06
4 O = 63.996
Add all of those together to get 109.936 round to 109.94
The ____________________ two objects are from each other, the _____________ the force of gravity between them. fill in spaces
Answer:
Farther, lesser
Explanation:
The farther the two objects are from each other, the lesser the force of gravity between them.
The force of gravitational attraction between two bodies is inversely proportional to the distance between them.
This premised on the Newton's law of universal gravitation which states that "the gravitational force of attraction between two bodies is directly proportional to the product of their masses and inversely proportional to the square of the distances between them".
So, the farther the distance, the lesser the gravitational attraction and vice versa.
Write down and Balance
the chemical equation
Hydrogen + Oxygen=Water
The energy of the emitted electrons depends on the
1. exposure
2. frequency
3. intensity
of the light.
Answer:
2. Frequency
Explanation:
Edge 2021
Which of the following statements regarding bond energies is FALSE?
Answer:where are the statements
Explanation:
Molecules in a gas have lots of energy and spread out even more than molecules in a liquid. Warm water has more energy than cold water, which means that molecules in warm water move faster than molecules in cold water. If the atoms of an object are moving fast, the temperature would be
High
Low
Medium
Unknown
Answer:
High
Explanation:
The answer to this question has been hinted in the question;
molecules in warm water move faster than molecules in cold water
This means that the relationship between temperature and movement of atoms is as follows;
At higher temperatures, atoms possess more energy and due to this they are able to move at high velocity (really fast).
On the other hand, lower temperatures means that the atoms possess less energy and due to this they move with a lower velocity.
Problem
Atoms of which two elements have a combined total of 39 protons?
A Nickle, Ni, and copper, Cu
B None of these
CPotassium, K, and calcium, Ca
DNitrogen, N, and oxygen, O
Submit Answ
Type here to search
Answer:
C) Potassium, K, and calcium, Ca
Explanation:
Given pair of elements:
Ni and Cu
Potassium and Ca
Nitrogen and oxygen
Solution:
We know that number of protons and number of electrons are always equal and number of electron or number of proton is called atomic number.
Number of protons given elements:
Ni number of protons = 28
Copper number of protons = 29
Combine number of protons = 57
K number of protons = 19
Ca number of protons = 20
Combine number of protons = 39
Ni number of protons = 7
O number of protons = 8
Combine number of protons = 15
Thus, option C is correct.
How is water used in human living? Give at least five examples.
What is the molecular formula for a compound that is 40.0% C, 6.6% H, and 53.4% O and the molar mass is 120.0g/mol?
Answer:
molecular formula of the compound is C₄H₈O₄
Explanation:
First the empirical formula of the compound is determined:
Divide the percentage masses by the molar mass of each element to determine the mole ratio;
Carbon, C: 40/12 = 3.33
Hydrogen, H: 6.6/1 = 6.6
Oxygen, O: 53.4 / 16 = 3.3
dividing through with the smallest ratio to obtain the simplest whole number mole ratios
C = 3.3/3.3 = 1
H = 6.6/3.3 = 2
O = 3.3/3.3 = 1
Therefore, the empirical formula is CHO
molecular formula/mass = n (empirical formula/mass)
120 g/mol = n( 12 + 1 * 2 + 16)
30n = 120
n = 4 therefore, the molecular formula = 4(CH₂O)
molecular formula of the compound is C₄H₈O₄
The liquid inside the cell is called
Answer:
The cytoplasm
Explanation:
Cytoplasm is the gelatinous liquid that fills the inside of a cell. It is composed of water, salts, and various organic molecules. Some intracellular organelles, such the nucleus and mitochondria, are enclosed by membranes that separate them from the cytoplasm.
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Humans have developed ways to increase the of their
environment. true or false
Answer:
True......................had to do this because we need atleast 20 letters
Which element would most likely bond with lithium & why?
Answer:
Fluorine is most likely to bond with lithium One lithium (Li) atom can combine with one fluorine (F) atom. Together, they make the formula LiF. Fluorine has seven electrons of it's own. Lithium gives up its one electron to make both atoms happy.
Answer:
Fluorine is most likely to bond with lithium One lithium (Li) atom can combine with one fluorine (F) atom. Together, they make the formula LiF. Fluorine has seven electrons of it's own. Lithium gives up its one electron to make both atoms happy.
Select the correct location on the image.
Identify the apparatus on the table that is best suited for a chemist to measure the volume of a liquid.
Answer:
The third one from the left–the graduated cylinder.
Explanation:
The laboratory apparatus that gives an "accurate" or "precise" measurement of a liquid's volume is the graduated cylinder. All you have to do is to pour the liquid into the cylinder and read its measurement using the calibrated scale.
The graduated cylinder comes in different sizes, which means the scale divisions will depend on its size. When reading the measurement, it is important to take note to read at the bottom of the meniscus because it gives the most accurate volume.
Answer:
graduated cylinder
Explanation:
Through which medium would it be easiest to hear someone speaking to you?
Select one
-sea water
-concrete wall
-vacuum
-Air
Answer:airr
Explanation:
What is a microbiome?
Answer:
A microbiome is the community of micro-organisms living together in a particular habitat.
Explanation:
What form of energy causes the chemical reaction in photosynthesis?
Answer:
Photosynthesis, the process by which green plants and certain other organisms transform light energy into chemical energy. During photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds.
Explanation:
Answer:
Radiant energy (from the sun)
Explanation:
What is the name of Na3N?
HELP PLEASEEEE !!!!
Answer:
the answer I's the first one
What is the molar mass of nitrogen gas, N2(g)? How many moles of nitrogen
molecules are in 56 grams? Explain.
Answer:
28g/mol
2 moles of nitrogen are present
Explanation:
The molar mass is defined as the mass of a chemical when 1 mole of this substance is present and is used to convert mass of the substance to moles or vice versa. Is widely used in stoichiometry problems.
1 atom of nitrogen has a molar mass of 14g/mol. N₂(g) -The molecule that contains 2 atoms of nitrogen- has a molar mass of 28g. That is 28g/mol.
56g of N₂ are:
56g * (1mol / 28g) =
2 moles of nitrogen are present5. Determine if each statement is true or false about forming a hypothesis:
a. It must be long.
b. It is an educated guess.
c. It is in if…then format.
d. It must be testable.
e. It must start with I think.
the question is a picture pls help
The unknown alcohol = 2-propanol
Further explanationGiven
volume = 50 ml
mass = 39.4 g
Required
The unknown alcohol
Solution
Density of sample :
= mass : volume
= 39.4 g : 50 ml
= 0.788 g/ml
The unknown alcohol at room temperature = liquid, so the unknown alcohol is 2-propanol because it has temperature range between -90 to 82 for liquid and the density = 0.788 g/ml
What will the formula of a diatomic element look like?
Answer:
or example, most samples of the elements hydrogen, oxygen, and nitrogen are composed of molecules that contain two atoms each (called diatomic molecules) and thus have the molecular formulas H2, O2, and N2, respectively. ... A molecule of sulfur is composed of eight sulfur atoms and is therefore written as S8.