When there are lone pairs on the valence shell of the central atom in a molecule, the bond angle is decreased.
The shape of molecules depend on the number of electron pairs on the valence shell of the molecules. These electron pairs could be lone pairs or bond pairs. Lone pairs occupy more space around the central atom since it is attracted to only one nucleus compared to bond pairs which are attracted to two nuclei.
When lone pairs are present on the central atom in a molecule, they tend to "squeeze" the molecule thereby decreasing the bond angle in the molecule. Hence, presence of one or more lone pairs of electrons make the bond angles get smaller.
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Which scientist is credited with developing the fist scientific atomic theory
Answer:
German chemist G.E. Stahl
Science is based on the correspondence theory of truth, which claims that truth corresponds with facts and reality.
Answer:
true/ correct
Explanation:
During the process of peer review, a scientific study must have:
Group of answer choices (( its not precision//validity ))
repetition
precision
accuracy
validity
Answer:
Accuracy
I guess
Cause then it makes sense
Hope this helps
Which of the following is the best definition of a chemical change?
A. All of these
B. The ability of something to undergo a change or reaction.
C. Something that can be observed or measured without changing the identity of the substance.
D. A change that alters the identity, or chemical composition, of a substance at the atomic level.
Answer:A
Explanation:
An electrochemical cell was designed using magnesium anode and zinc cathode calculate the EMF of the cell
Will the reaction be spontaneous or not? Give reason for your answer
When the cell potential is positive then the electrochemical reaction is spontaneous. The Ecell is positive when Zn serves as cathode and Mg serves as anode hence the reaction is spontaneous.
An electrochemical cell is any type of cell in which energy is produced by a spontaneous chemical reaction. Redox reactions that occur in an electrochemical cell produce energy.
An electrochemical cell becomes spontaneous only when Ecell is positive. Ecell is positive when a metal that has a more negative electrode potential serves as the anode.
Since Mg has a more negative electrode potential that Zn, it follows that a cell in which Mg is the anode and Zn is the cathode will have a positive Ecell and the reaction will be spontaneous.
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how should the mass of copper metal at the end of the reactions compare to the starting mass of copper?
Answer:
The produced mass of copper should equal the starting mass of copper.
A 10.0 cm sample of copper has a mass of 89.6 g. What is the density of copper?
Answer:
19.3 g/cm3
Explanation:
plz give branliest
Only_________are involved in forming chemical bonds betwen two atoms
a. s orbital electrons
b. p orbital electrons
c. valence electrons
d. innermost electrons
C)
Only valence electrons are involved in forming chemical bonds betwen two atoms.
Hope this helped you- have a good day bro cya)
at sea level, the average height of mercury in a barometer is
Answer: 760 mm
Explanation:
At sea level, a mercury column will rise a distance of 760 mm. At higher altitudes, the atmospheric pressure is decreased and so the column of mercury will not rise as high.
What metal is highly reactive and bonds easily with other elements
Answer: alkali metal
Explanation: ONLY if that is in you suggestions
if not i think this is right
Someone pls help me I will make you brain
Answer:
Lung function decreses at a faster rate for young people (last answer choice)
Explanation:
2 hydrogen atoms; 3 helium atoms; 5 oxygen atoms; 6 iron atoms
19 aluminum atoms; 15 phosphorus atoms; 7 sodium atoms
B. What do the following spellings indicate:
4Cl; 12 thousand; 17Zn; 2 grams; Three; 8C; 15Al
Answer:
4chlorine;12thousand ;17zinc;2grams;three 8carbon;15aluminium
Someone pls help me I will make you brain
Answer:
the first one
Explanation:
hope this helps
Someone pls help me I will make you brain
Answer:
The answer is true. ozone in the stratosphere is a toxic pollutant that can cause tightness or shortness of breath.
How long does it take Earth to make one rotation on its axis?
12 hours
48 hours
24 hours
Please answer ASAP
Answer:
24 hours
Explanation:
There are 24 hours in a day cause that is how long for the earth to spin on its axis
Answer:
24 hours
Explanation:
The time it takes Earth to rotate so the sun appears in the same position in the sky, known as a solar day, is 24 hours. However, the time it takes Earth to complete one full rotation on its axis with respect to distant stars is actually 23 hours 56 minutes 4.091 seconds, known as a sidereal day.
What is the process called when oxygen is mixed with another compound or element?
Answer:
Combustion
Explanation:
The process of adding oxygen to anything is called combustion
Which of the following are directly proportional? *
volume and temperature
pressure and volume
pressure and temperature
How does a balanced chemical equation demonstrate the Law of Conservation of Mass? (1 point)
O it shows that only physical changes follow the Law of Conservation of Mass
O it shows that no atoms have been gained or lost during the reaction
O it shows that the properties of the elements stay the same after the reaction
O it shows that all compounds remain bonded after the reaction
Explanation:
A balanced equation demonstrates the conservation of mass by having the same number of each type of atom on both sides of the arrow. enjoy
Answer:
It show that no atoms have been gained or lost during reaction
Explanation:
What is water supply ?
Answer:
a water suppley is water that pepople buy to dreak and ues
Explanation:
Mitotic cyclins control the progression of S phase and mitosis. G1 phase and G2 phase. S phase and G2 phase. G2 phase and mitosis
Answer:
D
Explanation:
Its D
Answer:
Its d for edge
Explanation:
what if water didnt have a negative charge?
Answer:
Explanation:
It would be positively charge
Which element is named after a scientist?
Why is there gold on the inside of a cell phone but plastic on the outside
Answer:
Gold is chemically stable and conducts electricity.
Small pockets of gold are used to make mobile phone circuit board.
The plastic is lined to act as antenna gate. It's what makes a phone not a calculator but a communication point, since it allows the data flow, Bluetooth connection, Wi-Fi. Mainly, it allows radio waves to flow.
Which of the following would not be made in a ribosome?
O enzymes
O cholesterol
O antibodies
O water-soluble hormones
Answer:
cholesterol(lipid)
Explanation:
Ribosomes are called PROTEIN FACTORY
Ribosomes are involved in protein synthesis
Any metabolite or substance protein in nature can be synthesized on ribosomes
enzymes are protein in natureantibodies are y shaped protective proteinswater soluble hormones are also amine or protein in natureSince they are protein in nature hence can be synthesized on ribosome.
WRONG OPTIONS:
CHOLESTEROL IS LIPID IN NATURE
LIPIDS ARE NOT proteins and cannot be SYNTHESIZED ON RIBOSOME
LIVER DOES THIS FUNTION OF CHLESTEROL SYNTHESIS.
the smallest unit of matter that retains the properties of that matter is
Answer:
here is your answer.
Explanation:
atom.
thanks for asking:)
When the skydiver is falling at a constant velocity after the parachute is open, what is their acceleration?
Answer:
Once the parachute is opened, the air resistance overwhelms the downward force of gravity. The net force and the acceleration on the falling skydiver is upward. ... The skydiver thus slows down. As the speed decreases, the amount of air resistance also decreases until once more the skydiver reaches a terminal velocity.
When the skydiver is falling at a constant velocity after the parachute is open, acceleration is zero.
The acceleration of the skydiver will be zero shortly after the parachute opens, but we can not call it as “acceleration due to gravity”.It's the acceleration due to gravity and air resistance together, and the forces cancel each other out to give an acceleration of zero.Once the parachute is opened, the air resistance overwhelms the downward force of gravity. The net force and the acceleration on the falling skydiver is upward.Learn more:
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A solution is made by adding 200 g table salt to 1 L water. The solubility of salt is 36 g/100 mL water.
Which term best describes this solution?
dilute
saturated
supersaturated
unsaturated
Answer:
The answer is unsaturated
Answer:
supersaturated
Explanation:
Where in the cell do most aerobic respiration take place?
a)
mitochondria
b)
cell membrane
c)
nucleus
cân bằng phương trình Al + HCl → AlCl3 + H2
Answer:
Explanation:
Balance the reaction of Al + HCl = AlCl3 + H2 using this chemical equation balancer!
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