Answer:B C E
Explanation:
Answer:
BCE
Explanation:
I got it right
Hope it helps
What happens if you are in a swimming
pool and you push a beach ball down
with your hands?
Answer:
it will float back up because it's not dense enough to go down
Based on the magnetic field lines shown, what is the orientation of the mystery magnet?
N-S
None of the above.
S-N
Cannot be determined.
In an experiment, a student collects 107 mL of H2 over water at a pressure of 104.8 kPa and a temperature of 30°C. How many grams of H2 are present?
A) 0.024 g
B) 4.00 g
C) 0.04 g
D) 0 049 g
And why
Answer:
The answer options provided are incorrect. The correct answer is 0.009g
Explanation:
Using PV = nRT
Where;
P = pressure (atm)
V = volume (L)
R = gas constant (0.0821 Latm/Kmol)
T = temperature (K)
n = number of moles
Based in the information provided;
V = 107mL = 107/1000 = 0.107L
P = 104.8kPa = 104800 Pa = 1.03atm
T = 30°C + 273.15 = 303.15K
PV = nRT
1.03 × 0.107 = n × 0.0821 × 303.15
0.1102 = 24.89n
n = 0.1102/24.89
n = 0.0044 mol
mole = mass/molar mass
Molar mass of H2 = 2g/mol
mass = molar mass × mole
mass = 2 × 0.0044
mass = 0.0088
mass = 0.009g
Which correctly lists the three main ocean zones
pls answer 15 points
Answer:
Deep zone, surface zone and transition zone.
Answer:
The answer is C. neritic, intertidal, open ocean.:) :) !!!!Explanation:
If 9.8g water is used in electrolysis, what is the percent yield if 5.6g of oxygen was
collected after the experiment?
H20 --> H2 + O2
Answer:
Approximately [tex]64\%[/tex].
Explanation:
[tex]\displaystyle \text{Percentage Yield} = \frac{\text{Actual Yield}}{\text{Theoretical Yield}} \times 100\%[/tex]
The actual yield of [tex]\rm O_2[/tex] was given. The theoretical yield needs to be calculated from the quantity of the reactant.
Balance the equation for the hydrolysis of water:
[tex]\rm 2\, H_2O \, (l) \to 2\, H_2\, (g) + O_2\, (g)[/tex].
Note the ratio between the coefficient of [tex]\rm H_2O\, (g)[/tex] and [tex]\rm O_2\, (g)[/tex]:
[tex]\displaystyle \frac{n(\mathrm{O_2\, (g)})}{n(\mathrm{H_2O\, (aq)})} = \frac{1}{2}[/tex].
This ratio will be useful for finding the theoretical yield of [tex]\rm O_2\, (g)[/tex].
Look up the relative atomic mass of hydrogen and oxygen on a modern periodic table.
[tex]\rm H[/tex]: [tex]1.008[/tex].[tex]\rm O[/tex]: [tex]15.999[/tex].Calculate the formula mass of [tex]\rm H_2O[/tex] and [tex]\rm O_2[/tex]:
[tex]M(\mathrm{H_2O}) =2\times 1.008 + 15.999 = 18.015\; \rm g \cdot mol^{-1}[/tex].
[tex]M(\mathrm{O_2}) =2\times 15.999 = 31.998\; \rm g \cdot mol^{-1}[/tex].
Calculate the number of moles of molecules in [tex]9.8\; \rm g[/tex] of [tex]\rm H_2O[/tex]:
[tex]\displaystyle n(\mathrm{H_2O}) = \frac{m(\mathrm{H_2O})}{M(\mathrm{H_2O})} = \frac{9.8\; \rm g}{18.015\; \rm g \cdot mol^{-1}} \approx 0.543991\;\rm g \cdot mol^{-1}[/tex].
Make use of the ratio [tex]\displaystyle \frac{n(\mathrm{O_2\, (g)})}{n(\mathrm{H_2O\, (aq)})} = \frac{1}{2}[/tex] to find the theoretical yield of [tex]\rm O_2[/tex] (in terms of number of moles of molecules.)
[tex]\begin{aligned} n(\mathrm{O_2}) &= \displaystyle \frac{n(\mathrm{O_2\, (g)})}{n(\mathrm{H_2O\, (aq)})} \cdot n(\mathrm{H_2O}) \\ &\approx \frac{1}{2} \times 0.543991\; \rm mol \approx 0.271996\; \rm mol \end{aligned}[/tex].
Calculate the mass of that approximately [tex]0.271996\; \rm mol[/tex] of [tex]\rm O_2[/tex] (theoretical yield.)
[tex]\begin{aligned}m(\mathrm{O_2}) &= n(\mathrm{O_2}) \cdot M(\mathrm{O_2}) \\ &\approx 0.271996\; \rm mol \times 31.998\; \rm g \cdot mol^{-1} \approx 8.70331 \; \rm g \end{aligned}[/tex].
That would correspond to the theoretical yield of [tex]\rm O_2[/tex] (in term of the mass of the product.)
Given that the actual yield is [tex]5.6\; \rm g[/tex], calculate the percentage yield:
[tex]\begin{aligned}\text{Percentage Yield} &= \frac{\text{Actual Yield}}{\text{Theoretical Yield}} \times 100\% \\ &\approx \frac{5.6\; \rm g}{8.70331\; \rm g} \times 100\% \approx 64\%\end{aligned}[/tex].
Na + H2O -> NaOH +H2 stoichiometry?
Answer:
Sodium + Water = Sodium Hydroxide + Dihydrogen
Explanation:
eaction of sodium with water
Sodium metal reacts rapidly with water to form a colourless solution of sodium hydroxide (NaOH) and hydrogen gas (H2). The resulting solution is basic because of the dissolved hydroxide. The reaction is exothermic.
HeLp Me PlEaSe , Ill MaRk YoU bRaInLiEsT !
Answer:
are you aking an NWEA?
Explanation:
Some people say that only gay and bisexual men are likely to be infected with hub true false
Answer:
They do have a larger chance, but others might be infected too.
PLS GIVE BRAINLIEST
Answer:
thats false, yes they have a bigger chance but anyone can get it.
Explanation:
what do you mean by atomic number?
Answer:
Atomic number is the number of protons in an isotope or element.
Explanation: The atomic number is the same number of protons in an element or isotope and if said isotope is neutral than it is the same number of electrons.
Example: Atomic number = 19 Protons = 19 if neutral Electrons = 19
To ensure that a vehicle crash is inelastic, vehicle safety designers add crumple zones to vehicles. A crumple zone is a part of a vehicle designed to crumple easily in a crash. Use Newton’s second law to explain why crumple zones reduce the force in a collision.
Answer:
well because with the velocity of the two, using the second law, it can slow the velocity before there is a casualty.
Explanation:
*NEED HELP ASAP*
The diagram shows changes of state between the solid liquid and gas. The atoms of a substate gain energy during a change of state. Before the change, the atoms are close together and cannot slide past one another. after the change, the substance can fill its container.
Which arrow represents the change of state described
above?
A-L
B-Μ
C-N
D-O
Answer:
A-L
Explanation:
Since before the change, the substance is described as having atoms "close together" and "cannot slide past one another", one can assume this is a solid, since in both liquids and gases, the atoms can move around more or less freely.
Then, it explains that the new substance "can fill a container", which is a property of both a liquid and a gas.
Thus, the answer would be either P, solid to liquid, or L, solid to gas.
Since P is not an option you can choose, by process of elimination, that leaves L, or option A.
Have a nice day! ^-^
Answer:
A-L
Explanation:
i took the test
hope this helps
A laboratory bottle of helium gas occupies a volume of 2.0 L at 760 mm Hg. Calculate the new pressure if the
volume falls to 1.8 L.
Answer:
844.4 mmHgExplanation:
The new pressure can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
Since we are finding the new pressure
[tex]P_2 = \frac{P_1V_1}{V_2} \\[/tex]
From the question we have
[tex]P_2 = \frac{2 \times 760}{1.8} = \frac{1520}{1.8} \\ = 844.4444...[/tex]
We have the final answer as
844.4 mmHgHope this helps you
When the element selenium (Se) ionizes to have a complete valence shell of electrons, the
result will be an lon that is?
Answer:
Positively Charged
Explanation:
The is a group XVI and period 4 element of the periodic table with similar physical and chemical to that of tellurium and sulfur. Selenium exist in different allotropic forms, which have different solubility including selenate, selenite and selenium in elemental form
The Se ion in selenate has a positive charge of +6, while the selenate ion has a charge of -2
The Se ion in selenite has a charge of +4, while the selenite ion has a negative charge of -2.
The charge of Se in elemental selenium is 0.
7. Calculate the amount of sodium hydroxide you will need to make 250 mL of a 0.1 M solution of sodium hydroxide.
Answer:
1 g
Explanation:
Given data:
Volume of solution = 250 mL (250 mL × 1 L/1000 mL = 0.25 L)
Molarity of solution = 0.1 M
Amount of sodium hydroxide = ?
Solution:
Molarity = number of moles / volume in L
0.1 M = number of moles /0.25 L
Number of moles = 0.1 M × 0.25 L
M = mol/ L
Number of moles = 0.025 mol
Mass of sodium hydroxide:
Mass = number of moles × molar mass
Mass = 0.025 mol ×40 g/mol
Mass = 1 g
help me with these problems please.
d. 6751 mL to liters. express your answer to four significant figures and include the appropriate units.
Answer: 6751 L
Explanation:
1000 mL = 1 L
so dividing 6751 by 1000 gives .6751 L
Which substance particle will be attracted by a positively charged object
Answer:
Protons
Protons are another type of subatomic particle found in atoms. They have a positive charge so they are attracted to negative objects and repelled from positive objects.
Explanation:
Which two of the given elements have the most similar chemical properties Mg, Ar, As, Sr
Answer:
Here is your answer
Explanation:
Mg and sr
What is the atomic mass
of an atom of calcium,
Ca?
Which answer is the best comparison of the physical sciences to the life sciences. A. Physical science is the study of energy and inanimate matter. Life science is the study of living organisms. B. Physical science is the study of proper exercise and diet. Life science is the study of how humans and animals relate to one another. C. Physical science is the study of objects outside the Earth's atmosphere. Life science is the study of life in or under Earth's atmosphere. D. Physical science is the study of energy and inanimate matter. Life science is the study of the behavior of humans and animals.
Answer:
A. Physical science is the study of energy and inanimate matter. Life science is the study of living organisms.
Explanation:
Sciences can be grouped into physical science and life sciences. PHYSICAL SCIENCE is a branch of science that involves the study of energy and inanimate objects i.e lifeless. Physical science encompass the following: physics, chemistry, astronomy, geology etc.
On the other hand, LIFE SCIENCES, as the name implies, is the study of living organisms. It is also referred collectively to as BIOLOGICAL SCIENCES and it includes aspects such as biology, botany (plant), zoology (animal), microbiology (microbes), biochemistry etc.
Answer:
its a for plato
Explanation:
1. What is the definition of a chemical property?
Answer:
that can be established only by changing a substance's chemical
Explanation:
Answer:
A chemical property is a characteristic of a substance abserved in chemical reactions.
Explanation:
Some major chemical properties include flammability, toxicity, heat of combustion, pH value, rate of radioactive decay, and chemical stability.
How can I get the 3 sig figs of this number 187515.4207
Answer:
1.88 x 10^5
Explanation:
You have to round because all of the numbers in 187515.4207 are significant
Round to: 188000
Put in scientific notation:
1.88 x 10^5
Answer:
well scientific notation would be = 1.875154207 × 10^5
you cant rlly simply the number any further to get 3 sig figs
youd need something like 187 to be 3 sig figs
are you saying the question correctly?
create a hypothesis that can be tested in an experiment
What element is Group 10, period 4
Answer:
Nickel
Explanation:
For a science project, Janet performs four experiments that are supposed to show a chemical reaction. She displays her results in a table. A 4-column table with 4 rows. The first column titled experiment has entries 1, 2, 3, 4. The second column titled substances has entries water + heat, vinegar + baking soda, cabbage juice + lemon juice, liquid A + liquid B. The third column titled evidence of reaction has entries gas formation, gas formation, color change, precipitate formation. The fourth column titled Chemical Reaction ? has entries yes, yes, yes, yes. In the column titled "Chemical reaction?,” which experiment’s data should be changed to "No”? Experiment 1 Experiment 2 Experiment 3 Experiment 4
Answer: D
Explanation:
What is the correct name for H5P2?
Answer:
Diphosphanium
Explanation:
mark brianliest
Uniformitarianism states that the geologic processes occurring in the past are the same processes that are occurring today.
Processes we see happening on Earth today have occurred for millions of years, forming the rocks and landforms around us. In the
Kimberley Region of Western Australia, there is a Devonian limestone formation with a structure similar to today's Barrier Reef. It
is composed largely of corals. Based on the principles of uniformitarianism, what can we infer about this region back in the
Devonian period?
A) The Kimberly region is composed of sedimentary rocks deposited over
millions of years since the Devonian period.
B) Because modern corals live in warm, shallow seas, we can infer the same
environment existed during the Devonian period, where the Kimberleys are
today
C) We can infer that the climate has not changed over millions of years in the
Kimberly region of Australia and both biotic and abiotic factors remain
constant over time.
D) Because modern corals live in warm, shallow seas, we can infer that over
millions of years the animals that comprise the reefs have adapted to
changes in environmental conditions in the Kimberly area.
Answer:
B) Because modern corals live in warm, shallow seas, we can infer the same
environment existed during the Devonian period, where the Kimberleys are
today
Explanation:
Based on the law of Uniformitarianism we can infer the environment that existed during the formation of the Devonian limestone and the Barrier Reef today.
Since the process that occurs in times past are still occurring today, the depositional environment must have been the same. The limestone in Kimberly suggests that they must have formed under warm, shallow sea very similar to that of the Barrier reef today. This interpretation is only made possible by the law of uniformitarianism.Answer: B
Explanation: USA test prep, K12
An atom's nucleus contains three protons and three neutrons. What is the
overall charge of the nucleus?
A. O
B. +3
C. -3
D. +6
Answer:
Explanation: A.0
Which phrase describes one type of freshwater wetland
Answer:
Small streams that flow into larger streams and wetlands
Explanation:
Hope this helps, have a great day (;
Answer:
D
Explanation:
verifyed got me the answer!
Polar molecules have _____.
Answer:
Iconic bonds.
HELP ILL GIVE 100 POINTS
If you put a piece of zinc into a solution of copper (I) sulfate and allow the single replacement reaction to go to completion, how will you know which of the reactants is the limiting reactant? Write the balanced equation, including the states of matter of the reactants and products, to help support your answer.