Answer:
Explanation:
chlorine has 7 valence electrons while sodium has 1. on their own, they are very reactive elements. a full valence electron shell has 8 electrons, so when elements combine and have 8 electrons in their outer shell, they are not reactive. when sodium and chlorine are combined to form sodium chloride (table salt), it is no longer dangerous. the number of valence electrons changes its reactivity and how it combines.
The properties of sodium and chlorine change when they are combined to make sodium chloride should be explained below.
Information regarding chlorine:chlorine comprises of 7 valence electrons while on other hand, sodium has 1. A full valence electron shell contains the 8 electrons, so when elements combine and have 8 electrons in their outer shell, they are not reactive.
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An airplane travels east with a velocity of 90 m/s. How long does it take the airplane to cover a distance of 405 meters?
A. 4.5 seconds
B. 60.0 seconds
C. 90.0 seconds
D. 3.0 seconds
Answer:
The answer is option AExplanation:
To find the time taken given the velocity and distance covered we use the formula
[tex]t = \frac{d}{v} \\ [/tex]
From the question we have
[tex]t = \frac{405}{90} \\ [/tex]
We have the final answer as
4.5 sHope this helps you
Which statements describe a human-created mass extinction? Select three correct choices.
Answer:
Explanation:
where are the choices? I could help but im going to need those choices?
Sorry.
Answer:
-it results from the disappearance of entire species in a short time
-it is caused by the growth of the human population
-it is a long-term change
(A,C, & D)
Explanation:
I got the question right in Edg.
:)
Please tell me and why ?
Answer:
Thanks for the points
Explanation:
A sample of gas has a volume of 526 mL at 346 mmHg and 35.0°C. Determine the moles of gas.
Answer:
The moles of gas is 0.009474 moles.
Explanation:
Given that,
Volume = 526 mL
Pressure = 346 mmHg
Temperature = 35.0°C
We need to calculate the moles of gas
Using formula of ideal gas
[tex]n=\dfrac{PV}{RT}[/tex]
Where, P = pressure
V = volume
R = gas constant
T = temperature
Put the value into the formula
[tex]n=\dfrac{\dfrac{346}{760}\times0.526}{0.08206\times(35+273)}[/tex]
[tex]n=0.009474\ moles[/tex]
Hence, The moles of gas is 0.009474 moles.
0.0
A loaf of bread has a mass of
250.0 g and a volume of
2,575 cm3. What is the
density of the bread?
cm3
10
1
Answer:
0.097 g/cm3
Explanation:
divide mass over volume
What mass of benzene takes
up
325 mL if its density is
0.874 g/mL?
Answer:
The answer is 284.05 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume = 325 mL
density = 0.874 g/mL
We have
mass = 325 × 0.874
We have the final answer as
284.05 gHope this helps you
2. If a person in a wheelchair wanted to get to the second story of a two-story building, would it be easier to
take a short, steep ramp or a long, shallow ramp? Explain.
Answer:
The short steep ramp would be much harder because you will have to work more against gravity.
Explanation:
The long shallow ramp would be easier to take than the short, steep ramp because the person would have to use more force on the short, steep ramp to push the wheelchair against the force of gravity.
What is an inclined plane?An inclined plane or a ramp can be defined as a flat supporting surface tilted at an angle, with one end higher than the other, utilized as an aid for raising or lowering a load.
The inclined plane can be defined as one of the six classical simple machines developed by Renaissance scientists. Inclined planes can be utilized to move heavy loads over vertical obstacles.
Moving a body up an inclined plane needs less force than lifting it straight up, at a cost of an increase in the distance moved. The mechanical advantage, the factor by which the force is decreased, is equal to the ratio of the sloped surface's length to the height it spans.
The inclined plane provides the same amount of work to be done with a smaller force exerted over a greater distance. The angle of friction or the angle of repose can be defined as the maximum angle at which a load can rest motionless on an inclined plane because of the friction without sliding down.
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Fill in the blank to the Periodic Pun
Oh, I ate too much! Now I’m going to _________________ the rest of the night.
Answer:
stay up?...or shxt the rest of the night
Answer:
Answer C
Explanation:
These four ELEMENTS were found in early earth and they make up all living things.
A) True
B) False
The four elements:
Hydrogen
Oxygen
Carbon
Nitrogen
Answer: True
Air is a mixture of many things; it's not just Oxygen, but Hydrogen, Carbon, and Nitrogen as well are made up of air. Fun fact: Nitrogen is actually more abundant in air
Name at least 3 elements used for photographs and cameras .
hope this help!
How would you determine an atom's charge?
Answer:
The charge of an atom is the number of protons minus the number of electrons.
What do the elements in Group 2 have in common?
Answer:
they are all on the periodic table and they are all elements ?
Answer:
They are all alkaline each metals and they each have the same number of valence electrons
what are the physical characteristics of sand
Answer:
what do you mean by this ?
Explanation:
Answer:
Sand has a grainy form
Explanation: That's all I know for now
Between Na and Na+ which has larger size
Answer:
Na+ is smaller than Na because, it has given away one electron because of which the electron shielding gets stronger due to more protons and less electrons. Whereas, Cl- is larger than Cl because it has gained an extra electron and so, the no.07/12/2010
Explanation:
14.600 oz = ____g
(HELP ME PLEASE)
Answer:
The answer is 414.64 g the other answer is wrong
Explanation:
I took this assignment and got this question right
What is an intermolecular force?
O A. A force within a covalently bonded molecule
B. A force acting between the atoms within a molecule
O c. A force that holds a molecule together
O D. A force acting between two different molecules
Intermolecular force is the force acting between two different molecules. There are various kinds of intermolecular forces and the they differ in their strength.
What are intermolecular forces?Intermolecular forces are force of attraction or repulsion acting between two different molecules in a compound. The like charges of molecules repels and unlike charges will attracts together.
There are different kinds of intermolecular forces such as hydrogen bonding, Van der Waal's forces, dipole, dipole forces, London dispersion forces etc.
The strength of these forces vary from each other. The intermolecular force of attraction holds tow molecules together in a compound. Hence, option D is correct.
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Trillions of cells join together to form ?
Answer: you like your body and tissue and organs and stuff
Explanation: it takes so much cells because of them being so small but with out them we would not be at all the same
which type of matter cannot be broken done into simplier substances by a chemical change
Answer: Because atoms cannot be created or destroyed in a chemical reaction, elements such as phosphorus (P 4) or sulfur (S 8) cannot be broken down into simpler substances by these reactions. Example: Water decomposes into a mixture of hydrogen and oxygen when an electric current is passed through the liquid
Explanation:
Answer:
elements because they are the simplest form of matter so they can't be broken
Explanation:
Hope this helps:)
In which of the following physical states are the particles in constant motion?
1. Solid
II. Liquid
III. Gas (Vapor)
I and Ill only
O I. II and III
Oil and ill only
Ill only
Answer:
cgeh
Explanation:salamat
What makes the atomic radius change along a period in the periodic table?
A. More electrons in the valence shell make the radius bigger.
B. More protons in the nucleus pull the electrons in, making the
atomic radius smaller.
C. The increased atomic mass makes the atomic radius bigger.
D. More electrons pair in orbitals, making the atomic radius smaller.
Answer:B
Explanation:
Which best explains why making a pancake from batter is an example of a chemical change?
The pancake that forms is a different state of matter.
The change from batter to pancake can be reversed.
A new substance forms when the batter is cooked.
The batter changes shape when it is cooked.
Answer:
the correct answer is C. A new substance forms when the batter is cooked
Explanation:
I got it right on edge 2021. Hope this helps
Which of the following substances is an element? A. water B. table salt C. iron oxide D. hydrogen
Answer:
[tex]\boxed {\tt D. \ Hydrogen}[/tex]
Explanation:
An element has a uniform composition, cannot be broken down by chemical change, every atom has the same atomic number, and can be found on the Periodic Table.
Water is made of hydrogen and oxygen atoms (H₂O) so it is not an element.
Table salt is made of sodium and chloride atoms (NaCl) so it is not an element.
Iron oxide is made up of iron and oxygen atoms, so it is not an element.
Hydrogen is an element. It can be found on the Periodic Table as element H.
The correct answer is D. Hydrogen
PLEASE APEZ HELP I DONT UNDERSTAND
A teacher placed a plastic cup of warm coffee with a lid in the freezer.
Which statement describes the frozen coffee in comparison with the warm
coffee?
A. The amount of coffee is the same.
B. The speed of the coffee molecules has increased.
C. The temperature of the coffee has increased.
D. The arrangement of the coffee molecules is the same.
Answer: The answer is A
Explanation:.
what are two things that affect gravity?
Answer:
When dealing with the force of gravity between two objects, there are only two things that are important – mass, and distance. The force of gravity depends directly upon the masses of the two objects, and inversely on the square of the distance between them.
Explanation:
Example of Anchoring Bias
Answer:
Here is an example of anchoring Bias
If I were to ask you where you think Apple’s stock will be in three months, how would you approach it? Many people would first say, “Okay, where’s the stock today?” Then, based on where the stock is today, they will make an assumption about where it’s going to be in three months. That’s a form of anchoring bias. We’re starting with a price today, and we’re building our sense of value based on that anchor.
Anchoring bias occurs when people rely too much on pre-existing information or the first information they find when making decisions. For example, if you first see a T-shirt that costs $1,200 – then see a second one that costs $100 – you're prone to see the second shirt as cheap.
Anchoring or focalism is a term used in psychology to describe the common human tendency to rely too heavily, or "anchor," on one trait or piece of information when making decisions.
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If you had 4 protons and 5 neutrons you created which element *
Answer:
Beryllium
Explanation:
No. of protons = 4
No. of electrons = 4 (number of protons and neutrons are the same)
No. of neutrons = 5
You need to look at the number of electrons of the outer shell (group no.) there are and how many shells there are (period no.)
Then look at the period table of elements to find the element
what is the orbital notation for silver?
Answer:
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1 4d10
Explanation:
I think
A boy found a solid metal box in his backyard. The box had been buried for so long, it was difficult to determine from what the box was made. The boy measured the box and found its volume (v) to be 17.63 cubic centimeters (cm3) and its mass (m) to be 158 grams (g). The boy knows the formula for density (D) is D = m/v. This table shows the density of several metals. DENSITY OF METALS *
A. copper
B. gold
C. silver
D. tin
Answer:
Box is made up of copper, because density is 8.96 g/cm³.
Explanation:
Given data:
Volume of box = 17.63 cm³
Mass of box = 158 g
Which metal box is this = ?
Solution:
First we will calculate the density of box then we will compare it with the density value of given metals.
d = m/v
d = 158 g/ 17.63 cm³
d = 8.96 g/cm³
The calculated density is similar to the given density value of copper thus box is made up of copper.
The chemical formula for hydrogen
peroxide is H2O2. What is the total
number of atoms in one molecule of
hydrogen peroxide?
A 2
B 4
C6
D 8
what are parts of this water wheel system?
Answer: Explanation:
Water wheels have several important parts that work together (see diagram).
*Flowing water (delivered via a channel called a mill race)
*Large wooden or metal wheels.
*Paddles or buckets (arranged evenly around the wheel)
*Axle.
*Belts or gears.