Explanation:
Volume of gas produced = 3.36 L
as molar volume of gas at STP is 22.4 L
so
no of moles of H2 = 3.36 ÷ 22.4 = 0.15 mole
from balanced reaction equation
Zn + 2HCl = ZnCl2 + H2
Ratio of no of moles between H2 : HCl is 1:2
as H2 moles = 0.15 mole
so
HCl moles reacted = 0.15 × 2 = 0.3 mole
as HCl molar mass = 1 + 35.5 = 36.5 g/mole
so Mass of 0.3 mole of HCl = 0.3 × 36.5 = 10.85 gram
fraction of HCl in Solution
= 10.85 ÷ 109.5 = 0.1
0.1 ×100 so HCl is 10% of solution mass
please help!!!!!!!!!!!
Answer:
I think it is B
Explanation:
Both prokaryotes and eukaryotes have all of those things except for organelles, which only eukaryotes have (also prokaryotes are smaller not eukaryotes)
Briefly explain why sulfur and phosphorus can form complicated molecules, but nonmetals in period 2 tend to form only diatomic molecules
Answer:
see below
Explanation:
Sulfur and phosphorous can violate the octet rule and have an expanded octet, so molecules of these elements can contain more than eight valence electrons. In contrast, nonmetal elements in period 2 can't have an expanded octet because they don't have d orbitals. These elements must obey the octet rule and can hold only up to eight valence electrons. Period 2 elements can fill their outer orbitals by covalently bonding with one other atom of the same element.
Which question can be answered by science?
Group of answer choices
Why should we help those less fortunate than us?
Which type of candy tastes the best?
Which kind of backpack do students purchase most often?
Why are children happy when they get home from school?
Answer:
C.
Explanation:
Answer the following question.
A(n) ______________ is an organism that lives on another organism and causes harm to that organism
Answer: The answer is Parasite ma dude
Explanation:
In evolutionary ecology, parasitism is a symbiotic relationship between species, where one organism, the parasite, lives on or in another organism, the host, causing it some harm, and is adapted structurally to this way of life.
Hopes this helps
Answer:
The answer of tis fill inthe blanks is tape worm because they suck the blood of their host its other example are liver fluje
How do ions form?please
if the density of a bar of gold is 19.3g/cm^3and you cut it into four pieces , what is its density of each piece of gold
Considering the definition of density and intensive and extensive properties, the density of each piece of gold is 19.3 [tex]\frac{g}{cm^{3} }[/tex]
Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space. In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance.
Intensive properties are those that will remain unchanged even though the amount of matter varies, while extensive properties vary depending on the amount of matter in a body.
Density is an intensive property, so it is independent of the sample size. This is because the solute will be present in a certain proportion with respect to the solvent. That ratio will not change unless more solute or more solvent is added. Consequently, the concentration remains constant (concentration is an intensive property) and density too.
Finally, the density of each piece of gold is 19.3 [tex]\frac{g}{cm^{3} }[/tex]
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all smart people i need help
Answer:
its b
Explanation:
Answer: the first box
Explanation:
Find the average atomic mass for Cl if 75.78% of Cl atoms are Cl-35 with a mass of 34.96885271 u and 24.22% are Cl-37 with a mass of 36.96590260 u.
Answer:
35.45253819
Explanation:
(0.7578*34.96....)+(0.2422*36.96...)
Relative and average atomic mass both describe properties of an element related to its different isotopes. Out of these two Relative atomic mas is more accurate. The average atomic mass of Chlorine is 35.45g.
What is mass?Mass defines the quantity of a substance. It is measured in gram or kilogram. Average mass is the mass of atoms of an element that are isotopes. It can be calculated by multiplying mass of a isotope to natural abundance of that isotope.
Average atomic mass = (mass of first isotope× percent abundance of first isotope)+(mass of second isotope× percent abundance of second isotope)
Substituting the given values
Average atomic mass=(0.7578×34.96....)+(0.2422×36.96...)
Average atomic mass=35.45g
Therefore, the average atomic mass is 35.45g.
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Which of the following substances has the highest melting point?
a. pentane b. nonane c. ethane d. butane
Nonane (b) has the highest melting point.
-----------------------------
A caveat: I'm assuming that we're dealing with the straight-chain isomers of these alkanes (specifically pentane and nonane). The straight-chain isomer of pentane (n-pentane, CH3-[CH2]3-CH3) has a melting point of -129.8 °C; the straight-chain isomer of nonane (n-nonane, CH3-[CH2]7-CH3) has a melting point of -53.5 °C. The pattern holds as you go down (or up): The more carbon atoms, the higher the melting point. So, in decreasing order of melting points here, you'd have the following: nonane > pentane > butane > ethane.
However, one structural isomer of pentane, neopentane, has a melting point of -16.4 °C, which is higher that the melting point of n-nonane despite neopentane having the same molecular formula as its straight-chain isomer. Of course, you're not to blame for coming up with this question; this is just some extra info to keep in mind.
A swimming pool, 10.0 m by 4.0 m, is filled with water to a depth of 3.0 m at a temperature of 20.2°C.
How much energy is required to raise the temperature of the water to 28.6°C?
Energy required : 4.23 x 10⁹ J
Further explanationHeat can be calculated using the formula:
Q = mc∆T
Q = heat, J
m = mass, g
c = specific heat, joules / g ° C
∆T = temperature difference, ° C / K
Volume of water:[tex]\tt V=L\times W\times H\\\\V=10\times 4\times 3=120~m^3[/tex]
mass of water :ρ = 1000 kg/m³
[tex]\tt mass=\rho\times V\\\\mass=1000~kg/m^3\times 120~m^3=120,000~kg[/tex]
Heat requiredc water = 4200 J/ kg ° C
[tex]\tt Q=m.c.\Delta T\\\\Q=1.2\times 10^5\times 4200\times (28.6-20.2)\\\\Q=42336\times 10^5=4.23\times 10^9~J[/tex]
true or false forming a hypothesis is the first strip of the scientific method
Answer:
True (probably)
Explanation:
I think it's true since creating hypothesis is the start of almost every scientific activities that we usually know. Please correct me if I'm wrong.
Which of the following represent a chemical compound? a. Cr b. CO c. Au d. Mg
What is cr2s3 bond type?
Answer:
ionic bond
Explanation:
because cr is a metal and s is non-metal
In a 2.00 g sample, which has the greatest number of atoms?
AI
S
All are equal
Na
Р
Answer
so AI has 13 atoms
S has 16 atoms
Na has 11 atoms
P has has 15 atoms
so the one with the most is S
S is sulfur
sulfur has many uses when it is processed along with some some biological uses.
Explanation:
Which two terms? i will mark brainlist
Answer:
I believe it's qualitative and continuous.
Explanation:
Answer:
Continuous, and Quantitative
Hope this helps :)
13. Identify the state(s) of matter described by each statement.
a. has a definite volume
b. has a definite shape
c. completely fills any container
d. flows
e. is made of particles held together in a rigid structure
f. is made of particles that are close together
Answer:
A: solid and liquid
B: solid
C: gas
D: liquid and gas
E: solid
F: solid
Can anyone answer this
Answer:
d
Explanation:
List the following elements in order of increasing atomic radius:
1. sulfur II. hydrogen III. strontium IV. iodine
V. oxygen
Answer:
sulfur
hydrogen
iodine
oxygen
strontium
Explanation:
An atom gets larger as the number of electronic shells increase; therefore the radius of atoms increases as you go down a certain group in the periodic table of elements.
In general, the size of an atom will decrease as you move from left to the right of a certain period.
Order of increasing atomic radius:
O < H < S < I < Sr
Describe the trend of atomic radius.The atomic radius measures the separation between an atom's nucleus and its farthest electrons.
The trend across a periodAtoms' atomic radii typically decrease from left to right.As electrons are added to the same primary energy level, protons are gradually added to the nucleus. Because of the increased positive charge on the nucleus, these electrons are gradually drawn closer to it. Atomic sizes shrink as the strength of attraction between nuclei and electrons grows.The trend down the groupWithin a group, atoms' atomic radii typically increase from top to bottom. Again, the positive nuclear charge rises as the atomic number decreases inside a group. The number of major energy levels that are occupied is increasing as well, though. The orbitals from higher primary energy levels have greater sizes than the orbitals from lower principal energy levels. Atomic radius increases down a group as a result of the stronger impact of the major energy levels outweighing the increase in nuclear charge.Learn more about atomic radius here:
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which combination of atoms will form a molecule but not a compound?
A).OXYGEN AND HYDROGEN
B).HYDROGEN AND CARBEN
C).OXYGEN AND OXYGEN
D).CARBEN AND OXYGEN
HELP ME PLZ IM SO CONFUSED IVE GOOGLED AND EVREYTHING HELP!!1
Answer:
A OXYGEN AND HYDROGEN
Explanation:
I need the Formulas for:
* Density: (I think it's - D = M/V?)
* Mass: ?
* Volume?
(CHEMISTRY FORMULAS ONLY!!)
Explanation:
mass = desity × volume
volume = mass/density...
i believe thats right...
btw u means Physics formulae only..lol
An organism contains 28 chromosomes and undergoes asexual reproduction. How many chromosomes will each of the resulting offspring contain?
Which of the following substances cannot be separated?
O homogeneous mixture
heterogeneous mixture
element
O compound
Answer: Elements.
Explanation: Homogeneous and heterogeneous is just if a mixture is uniform or not. Mixtures and always be separated. Compounds are elements that combined which can be broken down again. So I say the logical answer is an element since it's pure and cannot be broken down into other elements or more of it's self.
It is 1,518 miles from West Lafayette to Provo, UT (where Mrs. Fernandez started in college). If I drive in that direction 692 miles the first day and 674 miles the second day, how many more miles will I have to drive the third day until I reach my destination? Explain. *
Answer:
152 more miles you will have to drive the third day to reach the destination.
Explanation:
First you must know the distance during the first two days. If you drive 692 miles on the first day and 674 miles on the second day, to get the distance traveled on both days you must add both amounts traveled:
692 miles + 674 miles= 1,366 miles
Knowing that there are 1,518 miles from West Lafayette to Provo, UT, to know the number of miles you will have to drive on the third day to reach your destination, you must subtract between the total distance and the distance traveled in the first two days. This is:
1,518 miles - 1,366 miles= 152 miles
152 more miles you will have to drive the third day to reach the destination.
Which cell structure is found in animals, but not in plants?
Animal cells each have a centrosome and lysosomes, whereas plant cells do not. Plant cells have a cell wall, chloroplasts and other specialized plastids, and a large central vacuole, whereas animal cells do not.
Answer:
1
Explanation:
Which of the following is a measure of the amount of matter than object contained.
Weight
Mass
Volume
density
Answer:
weight = newton
mass = kilogram
volume = cubic meter
density = kilogram per cubic meter
Answer:
weight hghhiixjdhdhbdnfnfjfjjcndndnfmckkxkx
How many joules are contained in a snack cake that is labeled "230 Calories"?
(Hint: 1 Calorie - 1,000 calories, 1 cal - 4.184 J)
O A 9.62 X 102 J
B
9.62 X 1053
C. 54.9 J
5.49 X 10 to the power of 4
Answer:
9.62 × 10² J
Explanation:
In this problem, we need to convert 230 calories to joules. For this, we must know the conversion from calories to joules.
1 Calorie = 4.184 Joules
To find Joules in 230 calories, multiply 4.184 by 23. So,
230 Calorie = (230 × 4.184) Joules
= 962.32 Joules
or
230 Calories = 9.62 × 10² J
So, the correct option is (A).
Paul's doctor says his cardiorespiratory fitness level is excellent, but she worries about Paul's muscular fitness. Paul enjoys gymnastics, baseball, biking, and yoga. Increasing the frequency of which activity will best improve Paul's muscular fitness? (3 points)
Gymnastics
Baseball
Biking
Yoga
Answer:
Explanation:
Gymnastics
Answer: Gymnastics
If carbon lost one proton, what atom would be formed
Answer:
boron
Explanation:
boron has 5 protons and carbon has 6, so if carbon lost a proton, it would become boron since each element has a unique number of protons.
As each element has a different number of protons, boron has five and carbon has six, so if carbon lost one of its protons, it would change into boron.
What is proton ?Every atom has a proton, a subatomic particle, in its nucleus. The particle possesses an electrical charge that is positive and opposite to the electron's.
In the reaction, a proton is forfeited. Keep in mind that when the number of protons changes, the atomic number also changes, creating a new element. Carbon-14 is the end result as a result. It is a new element, yet it has the same mass as nitrogen-14.
When carbon creates covalent bonds, pairs of electrons are shared between the atoms instead of being gained or lost as happens with chemical bonds. The ability of carbon to construct lengthy chains of atoms and so create intricate biological compounds is due in part to this feature.
Thus, If carbon lost one proton, boron atom would be formed.
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People were surveyed to find out which part of the smore they like best. The data is as follows: 75% chocolate, 20% marshmallow, 5%. This information would be best displayed by aImmersive Reader
a. line graph
b. scatter plot
c. pie/circle graph
d. bar graph
Answer:
Pie/Circle graph
Explanation:
Pie/Circle Graphs are best for demonstrating parts of a whole, especially with percents.
