plz write question properly. Its not understandable.
How many moles are 7.6 x 1024 atoms of Helium?
Answer:
3.88
Explanation:
If the He H e injected into the abdomen produces a pressure of 22 mmHg m m H g and a volume of 2.7 L L at 31 ∘C ∘ C , how many grams of He H e were used?
Answer:
1280.27 g
Explanation:
Pressure = 22 mmHg / 760 = 0.0289 atm (Converting to atm by dividing by 760)
Volume = 2.7 L
Temperature = 31 ∘C + 273 = 304 K
Mass = ?
Using the ideal gas equation;
PV = nRT
n = RT / PV = 0.0821 * 304 / ( 0.0289 * 2.7)
n = 319.86 mol
Mass = Number of moles * Molar mass
Mass = 319.86 * 4.002602
Mass = 1280.27 g
The wave pictured represents a sound wave. Which label along the wave represents a sound with the LOWEST energy?
A)
A
B)
B
o
C
D)
D
Answer:
21
Explanation:
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The wave which is having higher frequency is associated with higher energy. In the given wave, the part B is labelling the lowest energy sound.
What are sound waves ?Sound waves are longitudinal mechanical waves passing through a medium. In a longitudinal wave the oscillation of particles is in a direction along the wave propagation.
A sound wave is composed of rarefactions and compressions. The area where, the particles have some separation with lower pressure is called rarefactions.
The area of high pressure where, the oscillating particles are closely packed is called compression of the wave. As the frequency of the wave increases, its energy increases, Therefore, the less frequency part B represent lowest energy sound.
Find more on sound waves:
https://brainly.com/question/11797560
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What percentage of the world's species of plants and animals can be found in the rainforest?
Answer:
50
Explanation:
how does a balanced chemical equation satisfy the law of conservation of mass
Calculate the Keq of the reaction CH4 + O2 ⇌ CO2 + 2H2O, given the following concentrations at equilibrium:
[CH4] = 0.37M [O2] = 0.25M [CO2] = 0.86M [H2O] = 0.44M
Question 1
10 pts
In the reaction C3Hg + 502 — 3CO2 + 4H20, what is the ratio of moles of oxygen used to moles of H2O
produced?
O 5:3
04:5
0 3:5
O 5:4
Answer:
5:4
Explanation:
The equation given is balanced. There are 5 O2's on the left (reactant side) and then 4 H2O's on the right (product side). Thus, it's a 5:4 ratio.
CH4 + 2O2 → CO2 + 2H2O How many products are produced by this reaction?
A.4
B.2
C.3
D.1
Answer:
i think its 2 but I'm not sure
Are viruses alive. What makes something alive?
Statement: No cell membrane or other organelles.
Statement: Most viruses do not have the fools to copy their own DNA
Statement: Outside of a host cell viruses do not use energy.
Statement: viruses don't appear to have active processes that respond to the environment
what
how many periods are there in the modern periodic table of elements?
Answer:
There are seven periods in the modern periodic table.
Answer:
Seven periods
Explanation:
There are seven periods in the periodic table, with each one beginning at the far left. A new period begins when a new principal energy level begins filling with electrons. Period 1 has only two elements (hydrogen and helium), while periods 2 and 3 have 8 elements.
Which of the following have London dispersion forces?
a. methane
b. carbon tetrachloride
c. bromine trifluoride
d. all of the above
A solution's hydrogen ion concentration is 1 x 10-5M.
What is the pH?
Answer:
pH=5
Explanation:
-log(1 x 10-5)=5
whats the salt produced when sulfuric acid reacts with iron?
Answer:
Dilute sulfuric acid reacts with metals higher than hydrogen in the reactivity series to form sulfate salts and hydrogen gas. Note the metal reactions are different with concentrated sulfuric acid. Iron is cleaned free from rust prior to coating with tin to form tinplate and with zinc to form galvanized iron.
What causes a substance to be hydrophobic?
Two parent reproduction involves cell division that includes ___________? *
Meiosis
Fibrosis
Mitosis
Answer:
Mitosis
Explanation:
Photo attached, can anyone help??? I need help with question 28
Answer:
so what it's saying is that chlorine has two atoms because diatomic means consisting of two atoms.
Explanation:
can I please have brainliest? :)
what is the hydrogen ion concentration in a 0.10M solution of KOH?
KOH is a strong base, so [OH-] = 0.10 M = 1.0 x 10^-1 M
[H+][OH-] = Kw
Kw = 1.0 x 10^-14
[H+] = 1.0 x 10^-14 / 1.0 x 10^-1 = 1.0 x 10^-13 M
is Radon an elementary substance or a compound?
Answer:elementary substance
Explanation:
how many moles of solute are present in a 2 L of a 25M potassium nitrate solution
a. 0.5 moles
b. 2 moles
c. 50 moles
d. 25 moles
I NEED THIS ANSWER ASAP, im taking the quiz right now and i need HELPPP
Answer:
50 moles
Explanation:
took the quiz
How many Hydrogen atoms are in the following compound (including the coefficient): 3(NH4)2CO3
Answer:
i believe it would be 12
Explanation:
because 3*4 is 12
Please help due tomorrow science
Answer:
1. start line drawn in ink
2. start line below solvent level
Explanation:
1. the line would run up the paper. should have drawn with pencil.
2. the samples would dissolve into solvent and not run up the paper.
The image shows the ________ formula of methyl formate
a- structural
b-skeletal
c- molecular
d- empirical
Answer:
Structural formula
Explanation:
This is because structural formula is use to show or indicate chemical bonds that are present between atoms of molecules. structural formula comprises of symbols that represent the atoms which are connected by short lines which indicate the presence chemical bonds which could be single line, double lines or even triple lines.
PLZ HELP
will give brainliest to best answer if I can
You are testing a solution for pH and find it to be 8.31 on the pH scale. Is this solution acidic, basic or neutral. Explain.
it's neutral
Explanation:
on the ph scale 7-8 is in the middle and everything after 8 is acidic and everything under 7 is basic. (you can look up a picture of a ph scale you will see what I mean)
This solution is neutral .
One useful method for calculating how acidic something is on a quantitative level is to utilize the pH scale. A solution is considered acidic if its pH value is less than 7. The solution is neutral if the pH is 7, and basic if the pH is higher than 7.What distinguishes neutral, acidic, and basic solutions?Neutral solutions are those with a pH of 7. The solution is acidic if the pH value is less than 7. The solution is basic when the pH value exceeds 7. These values increase on a negative logarithmic scale and represent the concentration of hydrogen ions in the solution.How does pH scale work?pH is a measure of how acidic/basic water is. The range goes from 0 - 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water.Learn more about pH brainly.com/question/3050355
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Help please!!!!!!!!!!!!!!!!!!!!!!!!
How many molecules are in 502.1 g of NaF?
Answer:
11.958129200057586 molecules
Explanation:
5. CFA 1.1 Explain how a rock and motor oil compare in their ability to be compressed.
Answer:h
Explanation:
G
SCIENCE ASSAP
Genetic Diversity
• The variation in genes that exists within a species
• Organisms with a large gene pool have a greater
chance of surviving and flourishing than a
population with limited genetic variability.
• Ex: resistance to disease, tolerance to cold
• Darwin termed this process "natural selection."
To the left you can see the variety of genes that exist
in types of fruit. Can you think of another species
that has similar variations?
Kesler Science, LLC
Answer:
Oranges
Explanation:
Oranges have a lot of genetic diversity within them, since oranges were already well versed in growing in winter months, oranges have gentically modified themselves through natural selection into be able to prouduce in warmer climates. Oranges also have changes in genetics which gives them a lot of gentic diversity that effects their, size, taste, texture, acidity and ability to reproduce.
Which of the following elements would have the highest electronegativity
value? *
0
N
S
P
Answer:
Oxygen will have the highest electronegativity
What factors are different in diagrams A and B?
Answer:
Acceleration Of B IS greater
Explanation:
F= mass x accelerarion
Acceleration of ( A) =20÷5 =4
Acceleration of (B) =5
A gas mixture contains oxygen, nitrogen, and carbon dioxide. It has a pressure of 250 mmHg. If the pressure of oxygen is 50 mmHg and the pressure of nitrogen is 175 mmHg then what is the pressure for carbon dioxide?
Answer:
[tex]P_{CO_2}=25mmHg[/tex]
Explanation:
Hello there!
In this case, according to the Dalton's law, which explains that the total pressure of a gaseous system equals the sum of the partial pressures of the gases composing, for the gaseous mixture composed by oxygen, nitrogen and carbon dioxide it would be possible to write:
[tex]P_{tot}=P_{N_2}+P_{O_2}+P_{CO_2}[/tex]
Now, given the pressure of the system and those of oxygen and nitrogen, we calculate that of carbon dioxide as shown below:
[tex]P_{CO_2}=P_{tot}-P_{N_2}-P_{O_2}\\\\P_{CO_2}=250mmHg-50mmHg-175mmHg\\\\P_{CO_2}=25mmHg[/tex]
Best regards!