Answer:
covalent bonds form between two nonmetals, resulting in a sharing of electrons-in order to reach their eight valence electrons (octet rule ) however the atoms rarely share the electrons equally. In polar covalent bonds, the electrons are shared unequally.
ex. HCl
and H2O
How many atoms are in 25.0 moles of calcium (Ca)?
Answer:
1.8066e+24 is the answer
Help please see attached screenshot
Answer:
balanced equation of glucose
6CO2 + 6H2O----------C6H12O6 + 6O2
in the presence of sun light.
6.
Ammonia (NH3) acts as a weak base in aqueous solution. What is the acid that reacts with this base
when ammonia is dissolved in water?
(A) NHA
(B) H2O
(C) Oxygen, which is always dissolved in water
(D) None of the above, there are no acids in pure water
Answer:
90% of people marry there 7th grade love. since u have read this, u will be told good news tonight. if u don't pass this on eight comments your worst week starts now this isn't fake. apparently if u copy and paste this on ten comments in the next ten minutes you will have the best day of your life tomorrow. you will either get kissed or asked out in the next 53 minutes someone will say i love you.!Explanation:
Ammonia acts as a weak base in aqueous solution. Water is the acid that reacts with this base when ammonia is dissolved in water.
What is a base?According to the Arrhenius concept, base is defined as a substance which yields hydroxyl ions on dissociation.These ions react with the hydrogen ions of acids to produce salt in an acid-base reaction.
Bases have a pH higher than seven as they yield hydroxyl ions on dissociation.They are soapy in touch and have a bitter taste.According to the Lowry-Bronsted concept, base is defined as a substance which accepts protons .Base react violently with acids to produce salts .Aqueous solutions of bases can be used to conduct electricity .They can also be used as indicators in acid-base titrations.
They are used in the manufacture of soaps,paper, bleaching powder.Calcium hydroxide ,a base is used to clean sulfur dioxide gas while magnesium hydroxide can be used as an antacid to cure acidity.
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What can be concluded from the following statements about a property of metats? • Acast-iron skillet on a stove is used to try bacon • A metal spoon left in a pot of soup heating on a stove is too hot to touch - An aluminum playground slide gets hot on a summer day. O A Metals combine with nonmetals.O B. Metals are good insulators. O C Metals conduct electricity D Metals conduct heat.
Answer:
D - metals conduct heat
True or false: chewing your food is the first step of digestion. o True O False
Answer:
True
Explanation:
I searched it up lol
What causes a substance to be hydrophobic?
help?? help for mee??? maybe? what if i said...please????
Answer:
c
Explanation:
because they transfer an electron the sodium ion has a positive charge, and the chlorine ion has a negative charge so one gives off positive and one gives of negative
bromine water can be used to distinguish between these two molecules?? true or false
Answer:i dkd
Explanation:
jsach
What percentage of the world's species of plants and animals can be found in the rainforest?
Answer:
50
Explanation:
List at least three things that your body strives to keep constant. (9 points) Think about what
aspects of your body overall, of one body organ, or of your blood stay nearly unchanged all the time
Answer:
Temperature, heart rate and blood flow.
Explanation:
The three things that our body strives to keep constant in overall body aspect are Temperature, heart rate and blood flow.
What is the Importance of Life process ?Life processes are important to carry out daily life activities. They help to produce energy and maintain homeostasis in the body. The life processes help a body survive with the changes in the environment.A slight disturbance in any of the life processes disturbs the entire functioning of the body.
Therefore ,
The Three things that our body strives to keep constant in overall body aspect are Temperature, heart rate and blood flow.
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explain why the boiling tube was slanted of the hydrated copper II sulfate
Question 15 (3 points)
How are cations and anions related to metals and nonmetals?
Answer:
uff mere dil ma ture kali chadiya ha uff tumi apne buni ha
Answer:
Cations (positively-charged ions) and anions (negatively-charged ions) are formed when a metal loses electrons, and a nonmetal gains those electrons. ... And all of them form an anion with a single negative charge.
You start with a container that is 8L big and the temperature in the room is 326K.
If the you take the container out in the heat at 352K, how big will it get?
Answer:
The new volume is 8.64 L.
Explanation:
Charles's Law consists of the relationship that exists between the volume and the temperature of a certain quantity of ideal gas, which is maintained at a constant pressure. For a given sum of gas at constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases.
In summary, Charles's law is a law that says that when the amount of gas and pressure are kept constant, the quotient that exists between the volume and the temperature will always have the same value:
[tex]\frac{V}{T} =k[/tex]
Being an initial state 1 that modifies its conditions until a final state 2, it is fulfilled:
[tex]\frac{V1}{T1} =\frac{V2}{T2}[/tex]
In this case:
V1= 8 LT1= 326 KV2= ?T2= 352 KReplacing:
[tex]\frac{8L}{326 K} =\frac{V2}{352 K}[/tex]
Solving:
[tex]V2=352 K*\frac{8L}{326 K}[/tex]
V2= 8.64 L
The new volume is 8.64 L.
when Henry mosléy came up with he's own atomic number?
I WILL MARK AS BR*NLIST IF YOU CORRECT ANSWER
Answer:
1911 is when he made it
Explanation:
Moseley's law provided a reasonably complete experimental set of data that supported the (new from 1911) conception by Ernest Rutherford and Antonius van den Broek of the atom, with a positively charged nucleus surrounded by negatively charged electrons in which the atomic number is understood to be the exact physical number of positive charges (later discovered and called protons) in the central atomic nuclei of the elements.
Why aren’t dominant genes ALWAYS more common?
Answer:
selective breeding
Explanation:
Example: pretend that rabbits can only be brown or black and black is dominant. If only the brown rabbits reproduce it will eventually be more common Hope this helps
what is the pH when h+=0.045 M?
Answer:
pH≈1.35
Explanation:
-log(0.045)≈1.35
. Chalk is made of CaCO 3 . How many molecules are in 5 grams of chalk?
Answer:
20.02 grams of chalk.
Explanation:
What volume of 5.00 M KI stock solution is needed to make 250. mL of a 1.50 M solution?
A) 0.0300 mL
B) 33.3 mL
C) 75.0 mL
D) 833 mL
Taking into account the definition of dilution, the correct answer is option C): 75 mL of the stock solution are required to prepare 250 mL of a 1.50 M solution.
Definition of dilutionYou have to know that when it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution.
Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.
In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where:
Ci: initial concentrationVi: initial volumeCf: final concentrationVf: final volumeVolume of 5.00 M KI stock solution neededIn this case, you know:
Ci= 5 M Vi= ?Cf= 1.5 MVf= 250 mL= 0.250 L (beign 1 L= 1000 mL)Replacing in the definition of dilution:
5 M× Vi= 1.5 M× 0.250 L
Solving:
Vi= (1.5 M× 0.250 L)× 5 M
Vi= 0.075 L= 75 mL
In summary, the correct answer is option C): 75 mL of the stock solution are required to prepare 250 mL of a 1.50 M solution.
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Given : 4.50 molte
How many moles of ammonia would you get if 4.50 moles of hydrogen gas
reacted
19) Which one of the following statements describes a chemical property of hydrogen gas?
A) Hydrogen gas has a density of 0.00009 g/cm’ at STP.
B) Hydrogen gas burns in air.
C) Hydrogen gas has a boiling point of 20. K at standard pressure.
D) Hydrogen gas is colorless.
HELP!! 30 POINTS!!!! What does the energy graph look like for this reaction??
C3H8+5O2 -> 3CO2+4H2O
I have the data, I just need to know how to make the graph, please!!
total enthalpy of reactants= -103.85
total enthalpy of products= =-2147.81
=-2043.96 kJ/mol exothermic reaction
Answer:
Bottle Nose Dolphin ummmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm
Explanation:
a tiny particle in the nucleus of an atom that is about the same size as a proton is a(n)
A. electron
B. neutron
C. solid
D. element
Answer:
b. neutron.
Explanation:
I hope this helps.
Answer:
B. Neutron
Explanation:
Neutrons are about the same size as protons. In addition, nuclei are made up of neutrons and protons. Electrons are located in the electron cloud, which is outside of the nucleus. Solids are hard matter, and an element is a substance that cannot be broken down any further.
Hope this helps!
1. Cancer is a disease in which cells
a. grow and divide uncontrollably. b. die before they can mature.
c. stop producing DNA. d. die during mitosis.
____ 2. Which of these traits is controlled by a gene with multiple alleles?
a. straight hairline b. smile dimples
c. widow’s peak d. blood type
____ 3. Which of these is an example of the benefits of genetic engineering?
a. cross-breeding to create disease-resistant crops
b. creating human insulin to treat people with diabetes
c. analyzing karyotypes and pedigree charts
d. growing a new plant from a cutting
____ 4. A carrier is a person who has
a. one recessive and one dominant allele for a trait.
b. two recessive alleles for a trait.
c. two dominant alleles for a trait.
d. more than two alleles for a trait.
____ 5. Sex-linked genes are genes on
a. the X chromosome only. b. the Y chromosome only.
c. the X and Y chromosomes. d. all 23 pairs of chromosomes.
______ 6. What is the chromosome theory of inheritance?
a. Chromosomes are carried from parents to offspring on hybrids.
b. Genes are carried from parents to offspring on chromosomes.
c. Hybrid pairs of chromosomes combine to form offspring.
d. Codominant genes combine to form new hybrids.
____ 7. How can a mutation affecting skin be harmful to an animal?
a. It can make the animal more visible to its prey or predators.
b. It can cause disease in the animal.
c. It can make the animal resistant to certain diseases.
d. It can make the animal resistant to drugs
______ 8. What happens during meiosis?
a. Two sex cells combine.
b. Chromosome pairs separate and are distributed into new sex cells.
c. Each sex cell copies itself to form four new chromosomes.
d. Chromosome pairs remain together when new sex cells are formed.
Answer:
1. a
2. a.
3. b.
4. a.
5. c.
6. b.
7. a.
8. c.
Explanation:
A 2.50 L sample of butane gas (C4H10), measured at 22.0
oC and 1.20 atm pressure, is combusted completely and
the carbon dioxide gas collected at the same pressure and
temperature. What volume of CO2 is produced?
Answer:
Same i guess hdjekfhkshfjfkr
The resultant volume of the carbon dioxide gas which is produced by the combustion of butane is 14.4L.
How do we calculate the moles of gas?Moles of any gas will be calculated by using the ideal gas equation as:
PV = nRT, where according to qustion for butane gas
P = pressure = 1.20 atm
V = volume = 2.50L
n = moles = ?
R = universal gas constant = 0.082 L.atm / K.mol
T = temperature = 22 degree celsius = 295.15 K
On putting values we get
n = (1.20)(2.50) / (0.082)(295.15) = 0.124 moles
Given chemical equation is:
C₄H₁₀ + 13/2O₂ → 4CO₂ + 5H₂O
From the stoichiometry of the reaction, it is clear that,
1 mole of C₄H₁₀ = produces 4 moles of CO₂
0.124 mole of C₄H₁₀ = produces 4×0.124=0.496 moles of CO₂
Now we calculate the volume for the carbon dioxide gas at the given pressure and temperature as:
V = (0.496)(0.082)(295.15) / (1.20) = 14.4 L
Hence required volume of CO₂ is 14.4 L.
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Two tons of water is pumped into a tank 15 ft. High in 5 minutes. Determine the power output of the pump. (Note: One ton is equal to 2,000 lb. And remember to convert the minutes to seconds.)
Answer:
200 lb•ft/s
Explanation:
From the question given above, the following data were obtained:
Force (F) = 2 tons
Time (t) = 5 mins
Height (h) = 15 ft
Power (P) =?
Next, we shall convert 2 tons to pound. This can be obtained as follow:
1 ton = 2000 lb
Therefore,
2 tons = 2 × 2000
2 tons = 4000 lb
Next, we shall convert 5 mins to seconds. This can be obtained as follow:
1 min = 60 s
Therefore,
5 mins = 5 × 60
5 mins = 300 s
Finally, we shall determine the power of the pump. This can be obtained as follow:
Force (F) = 4000 lb
Time (t) = 300 s
Height (h) = 15 ft
Power (P) =?
P = F × h / t
P = 4000 × 15 / 300
P = 60000 / 300
P = 200 lb•ft/s
Thus, the power of the pump is 200 lb•ft/s
Answer:
It's 200 ft-lb/sec
Explanation:
I did it before!
Which property of sulphuric acid makes it suitable to use as a catalyst for the preparation of esters?
helllllppppppp pleaseeeeeee
After eating, nutrients must be oved to other parts of the body. Which of the following systems will transport these nutrients.
nervous
digestive
circulatory
excretory
Answer:
The circulatory system
Explanation:
name two examples which are not considered as matter
Answer:
Light and Sound can be considered as non-matter.
Explanation:
Various forms of Energy like Heat, Sound, Light can be considered as non-matter
what happens to the electrons in an ionic bond and a covalent bond?
Answer:
In ionic bonding, atoms transfer electrons to each other. Ionic bonds require at least one electron donor and one electron acceptor. In contrast, atoms with the same electronegativity share electrons in covalent bonds, because neither atom preferentially attracts or repels the shared electrons.
Answer:
In ionic bonding,
atoms transfer
electrons to each
other. Ionic bonds
require at least one electron
donor and one electron
acceptor. In contrast, atoms
with the same electronegativity
share electrons in covalent
bonds, because neither atom
preferentially attracts or repels
the shared electrons.