How many moles are equal to 157.8g of CaCl2?
Help me with this please!!
Answer:
To remember the order of taxa in biology (Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species):
"Dear King Philip Came Over For Good Soup"
Do Kings Play Chess On Fine Green Silk?
Do Kindly Place Cover On Fresh Green Spring Vegetables
Darn Kernel Panics Crash Our Family Game System
Do Keep Pond Clean Or Froggy Gets Sick
Convert from: 689 m =____mm*
(Metric Conversion chart)
A. 68,900 mm
B. 689,000 mm
C. 0.689 mm
D. 0.000689 mm
Answer:
b) 689,000mm
as 1m= 1000mm
Answer:
A
Explanation:
mark me brainlisted please
1. Sequence Order the path of a sound wave
from when it is produced by a source until
it is interpreted by the brain
Answer:1. The sound waves arrive at the pinna (auricle), the only visible part of the ear.
2. Once the sound waves have passed the pinna, they move into the auditory canal (external
acoustic meatus) before hitting the tympanic membrane (eardrum).
3. Once the sound waves reach the tympanic membrane, it begins to vibrate and they enter
into the middle ear.
4. The vibrations are transmitted further into the ear via three bones (ossicles): malleus
(hammer), incus (anvil), and the stapes (stirrup). These three bones form a bridge from
the tympanic membrane to the oval window.
5. Once sound passes through the oval window, it enters into the cochlea in the inner ear.
6. Hair cells in the organ of Corti (within the cochlea) are stimulated which in turn
stimulates the cochlear branch of the vestibulocochlear nerve.
7. The cochlear nerve then transmits electrical impulses to the auditory region of the brain
in the temporal lobe.
Explanation:
A male construction worker regularly consumes 18 000 kJ of energy per day. Suggest the effects this could have on his health.
Answer:
It could lead to Fatigue
Low energy.
Headaches.
Aches, pains, and tense muscles.
Chest pain and rapid heartbeat.
Explanation:
If a construction worker consumes 18000 KJ of energy on a daily basis, this could lead to adverse effects such as fatigue, headaches, aches, tense muscles, chest pain, and rapid heartbeat.
What are the energy requirements for a construction worker?
The NHS advises a man who is working at a construction site to eat 2,500 calories, and women to eat 2,000 calories, on daily basis. On an average, construction workers such as women should have around 2,000 calories a day which carries about 8,400 kilojoules and men should have around 2,500 calories a day which is about 10,500 kilojoules.
The best diet for a construction worker include foods such as grain, vegetable, fruit, dairy product, lean meat, seed, and fats for the maintenance of a healthier condition.
If a construction worker is taking 18000 KJ of energy in diet which is almost 8000 KJ more than the required amount then in this case, the worker may have fatigue, headaches, aches, tense muscles, chest pain, and rapid heartbeat.
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4. (10 Points) Why would a mixture of gases in a 5 L balloon react faster than a
mixture of the same gases in a 10 L balloon?
Answer:
There is more space in a balloon with less gases meaning it can move around a lot faster
Explanation:
How many moles of nitrogen are in 1 mole of Al(NO3)3?
O A. 4 moles of nitrogen
O B. 1 mole of nitrogen
C. 3 moles of nitrogen
O D. 7 moles of nitrogen
Answer:
c i think
Explanation:
how many atoms are present in the compound (nh4)2cr2o7
Answer:
2,8,2,and,7
Explanation:
What Is 50.0 g of water, H(2)O
Answer:
The chemical formula H₂O indicates that in one mole of the water there are two moles of hydrogen atoms. Calculate the moles of H₂O in 50 g. moles (n) ..
Explanation:
i need this asap will give brainliest
Answer:
Explanation:
42.32
Hope this helps sorry if wrong
Which is the chemical formula for a dinitrogen trioxide molecule?
A. SN2O
B. 2N3O2
C. NO3
D. N2O3
Answer:
The Answer would be D. N2O3
Explanation:
the Chemical bond is a Covalent bond to which the prefixes are Di and tri
Which of the following halogens has the largest atomic radius?
a. Chlorine
b. lodine
c. Bromine
d. Fluorine
Answer:
[tex]\boxed {\boxed {\sf B. \ Iodine }}[/tex]
Explanation:
Atomic radius is the measurement from the nucleus to the outer edge of the electron cloud.
As you go down a group (vertically) the atomic radius increases because more electron shells are added. As you go across a period horizontally, the atomic radius decreases.
If we look at the halogens group (17), we see they follow this order from top to bottom:
F - Fluorine
Cl - Chlorine
Br - Bromine
I - Iodine
Since it increases down the group, iodine must have the largest atomic radius.
Why is it dangerous to produce carbon dioxide in a closed container?
Please someone answer it’s due soon, and if you can get into detail with the answer
If two vectors combine in the same direction what mathematical operation would you use to
find the resultant vector?
Answer:
The head-to-tail rule is used to sum two vectors pointing in the same direction. (Vectors in the same direction are called collinear). The sum vector is slightly moved out of its correct position so that you can see it. For now, to determine if two vectors have the same direction look at a picture or use geometry.
E Zora wants to dissolve a solute in a solvent quickly. Which best describes what she should do? O decrease the pressure O decrease the surface area O shake it repeatedly O place in a refrigerator Mark this and return Save and Exit Next.
Answer:
c
Explanation:
By dissolving a solute in a solvent, a solution can be formed. To dissolve the solute in the solvent quickly, the solution must be shaken well. Thus option A is correct.
What is a solution?A solution is a substance formed by a solid solute in a solvent. The solution can be of homogeneous or hetreogenous. A homogenous solution is the one where the solute completely dissolve in the solvent and both the solvent and solute are in one phase.
In heterogenous solution, the solute and solvent are in two different phases due to the incomplete solubility of the solute. The solubility of a solute depends on the bond type of both solvent and solute, weight of solute, temperature and pressure as well mixing mode by shaking.
Some times heating the solution can be a good way to increase the solubility and quick dissolving. Where, the solute-solute interaction decreases and solvent-solute interaction increases.
Similarly, shaking thoroughly will make the solute easily dissolve. Hence, option A is correct.
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At 7 a.m., the science classroom had a temperature of 68˚F. By 3 p.m., the temperature had increased to 75˚F. Calculate the rate of temperature change from 7 a.m. to 3 p.m.
Hai!
I believe it would have to be 2.3.
Brainliest maybe?
Necesito las caracteristicas fisicas y quimicas de la teoria inorganica del petroleo
Answer:
de lapora en ciesta coma bodre sin una jacsinis loadera comastora jingla belaa
Explanation:
ik, i’m stup!d. please help:(
Answer:
a
Explanation:
If a disease strikes the snake population in the food chain shown, what will happen to the populations of hawks?
The population of hawks would decrease
The population of hawks would increase
The population of hawks would stay the same.
The population of hawks will increase and then decrease.
Answer:
The population of hawks would decrease cause the snake is decreasing
Explanation:
although i would think hawks could eat rabbits but it doesn't ask you that so its haws decreasing
Answer: The population of Hawks will decrease.
Explanation: When the population of one species decreases suddenly, as when a disease strikes the population, the populations higher in the food chain also decrease due to a loss in food supply. In this case the hawk population decreases because there are suddenly fewer snakes to eat. The species below the diseased species in the food chain increase because there are fewer predators. In this case, the rabbit population increases because there are fewer snakes to eat them.
balance Na20+H20--> NaOH
Answer:
2NaOH
Explanation:
Order these atoms from the highest to lowest amount of protons.
1. gallium
2. tin
3. potassium
4. barium
5. aluminum
Which of the following does NOT represent a consumer organism?
O Carnivore
Chemotroph
O Scavenger
O Herbivore
Answer:
number three
drop a like to help other people out
PLEASE HELP ME I WILL LOVE U FOREVER
Answer:
according to me option a is the correct one
How does a flux capacitor deteriorate under high octane pressure?
4. Which chemical formula below contains 2
different elements?
A. CO
B. Fe2O3
C. C2H4
D. All of the above
The chemical formula of CO, Fe₂O₃, and C₂H₄ contain atoms of two different elements. Therefore, option (D) is correct.
What is the chemical formula?A chemical formula provides information about the chemical proportions of atoms of each element that are present in a molecule or chemical compound. The chemical formula can be represented by using chemical symbols of elements, numbers (subscripts), and other symbols, such as commas, dashes, brackets, and plus (+) and minus (−) signs.
A chemical formula of a compound has no words but can be written in certain simple chemical structures. Chemical formulae can be more limited in power than chemical names and structural formulae. There are two kinds of chemical formulas in which one empirical formula and another molecular formula.
In the chemical formula of carbon monoxide (CO) has carbon and oxygen two different elements. In the chemical formula of iron oxide (Fe₂O₃) iron and oxygen are two different elements. In the chemical formula of ethane (C₂H₄ ) has carbon and hydrogen two different elements.
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I need to talk to a boy please ?
Please i need help with this question.
Please show workings where necessary and proof/ explain your point
Answer:
C
Explanation:
Please see the attached picture for the explanation.
Le Châtelier's principle:
When a stress is applied to a system at equilibrium, the system will respond by shifting in the direction that opposes/ minimizes the effect of the stress.
• This stress could be the addition or removal of a product or reactant, changes in the concentration of the products or reactants, or a change in temperature.
☆ Why can heat be written on the same side of the products when the reaction is exothermic?
• Exothermic means that heat is released, thus heat can be treated as a product.
• I like to remember it as Exothermic → Exit
An electron in an atom of hydrogen goes from energy level 6 to energy level 2. What is the wavelength of the electromagnetic radiation emitted?
Answer:
410 nm
Explanation:
when an electron falls from ni=6 to nf=2 , a photon of wavelength 410 nm is emitted.
When an electron falls then the wavelength of the electromagnetic radiation emitted is = 410 nm.
What is electromagnetic wavelength?
When The Electromagnetic wavelength directs to the measured distance between the trough or crest of each adjacent wave generated by the electromagnetic disturbance.
When the wavelength of electromagnetic radiation is comparable to the de Broglie wavelength of its quantum (photon).
Now we are Showing that the wavelength of electromagnetic radiation is comparable to the de Broglie wavelength of its quantum (photon).
Therefore, when an electron falls from ni=6 to nf=2, a photon of wavelength 410 nm is emitted.
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Which element would form a Covalent (Molecular) bond with Hydrogen (H)?
Answer:
Fluorine
Explanation:
Answer:
Covalent bonds usually occur between nonmetals. For example, in water (H2O) each hydrogen (H) and oxygen (O) share a pair of electrons to make a molecule of two hydrogen atoms single bonded to a single oxygen atom.
Most representative metal atoms tend to gain enough electrons to attain a stable noble gas (octet) configuration.
True or False
Answer:
False
Explanation:
Non- metals tend to gain electrons easily, metals tend to lose electrons easily
For example, oxygen, a non-gas, when it is an ion, has the option to lose 6 electrons to become like helium, or gain 2 electrons to become like the noble gas neon. However, it becomes like neon for 2 reasons.
A. As a general rule, atoms lose/gain the LEAST amount of electrons.
B. Oxygen is a nonmetal, therefore, to become like a Noble Gas, it would gain, as non-metals usually would, 2 electrons.