Answer:
d. never alters
Explanation:
physical is how it looks, not its chemical makeup... good luck bro :)
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
Question 3 (2 points)
The electromagnetic waves with the lowest frequency are ______ waves.
Answer:
Radio Waves have the lowest frequency but the highest
Explanation:
From the acronym GUX = VIR
Wavelength, deviation, and refractive index increases to the right
but frquency increases to the left
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
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 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
50 pts don't dare to answer wrong or just write irrelevant.
answer must be with explanation. would mark brainliest.
Answer/Explanation:
Part 1 and 3: Test tube 4. The hot water and Acid added to the substance makes it much more reactive, which is the reason why the new substance is bubbling. Hot water allows the particles in a chemical reaction have enough force and more chances to go through actual reaction process. This also caused it to create the most bubbles.
Part 2 and 4: Test tube 1 had the least amount of chemical reactivity. Cold water slows down the amount of times a particle in the substance hits another. This reduces the chance of it reacting and the strength of it's reaction. Test tube 1 was also missing the citric acid. Since acids have low pH it is very reactive with other particles with substances that contain less than 8 valence electrons. Without the acid it doesn't have ad much urge to react with. The lower the pH the better reactivity.
1.How many protons are in the nucleus of an aluminum atom? 2.How many electrons does an aluminum atom have?
Answer:
There are 13 numbers in an aluminum atom and 13 electrons.
Explanation:
This is because the atomic number equals the number of protons and the atomic number of Al is 13. The number of electrons also equals the number of protons.
Answer:
13, 13
Explanation:
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
3. Plate movement is caused by heat-related movement in which layer of
the Earth? *
O the inner core
O the outer core
O the mantle
O the crust
Answer:
the plate movement that caused by heat-related movement is the mantle
Explanation:
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
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
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!
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.
PLEASE HELP MEEEE
Africa
Asia (India)
Australia
Europe
Answer:
Australia is correct
Explanation:
Because it is not attached to any other place
Activity 12 - Group Me
Directions: Identify the following wastes according to the types, properties and
effects to human health and environment. Write your correct answer on your TLE
notebook
Wastes
Types
Properties
Effects to Human, Health
and Environment
Household service
Answer:
You can look the answer at the photo
thankss
HeLp Me PlEaSe , Ill MaRk YoU bRaInLiEsT !
Answer:
are you aking an NWEA?
Explanation:
i think it's physical changes but ima need a second opinion lol
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.
is nitride on the periodic table
Answer:
yes
Explanation:
Nitride, any of a class of chemical compounds in which nitrogen is combined with an element of similar or lower electronegativity, such as boron, silicon, and most metals.
The question, Is nitride on the periodic table, would have the answer of No as it is not an element.
Why is Nitride not on the periodic table ?The periodic table lists the elements, which are the basic building blocks of matter. Nitride is not an element, but rather a compound that is formed when nitrogen combines with another element.
Nitrogen is a non-metal that is found in group 15 of the periodic table. It has an atomic number of 7, which means that it has 7 protons in its nucleus. Nitrogen is a very reactive element, and it can combine with many other elements to form compounds.
Find out more on the periodic table at https://brainly.com/question/25916838
#SPJ6
Which element in the following sets has the smaller atomic radius?
a. P, Bi, As, N b. Ru, Sr, Te, Xe c. Al, B, Tl, In
Answer:
Atomic radii vary in a predictable way across the periodic table. As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period. Thus, helium is the smallest element, and francium is the largest.
The He or helium is a smallest element and the Fr or the francium is largest.
What is the atomic radius ?The atomic radius is a chemical element and is a measure of the atomic size. It typical distance from the center of the nucleus is bounded by the electron shells.
The atomic radii can vary on basis of the periodic table. Hence can be seen as the radius increases from top to the bottom in a group, and then decreases from left to the right across a period.
Find out more information about the atomic radius.
brainly.com/question/1445177.
Which scenario would result in a population growth of zero? Use this formula: population growth = (birth rate + immigration) – (death rate + emigration) 12 individuals emigrate, 12 individuals die, 12 individuals are born, 0 individuals immigrate 16 individuals emigrate, 3 individuals die, 13 individuals are born, 0 individuals immigrate 8 individuals emigrate, 0 individuals die, 20 individuals immigrate,12 individuals are born 10 individuals emigrate, 4 individuals die, 14 individuals immigrate, 0 individuals are born
Answer:
12 individuals are born 10 individuals emigrate, 4 individuals die, 14 individuals immigrate, 0 individuals are born
Explanation:
From the formula:
Population growth = (birth rate + immigration) – (death rate + emigration)
= (b + i) - (d + e)
For the first option, b = 12, i = 0, d = 12, e = 12
population growth = (12+0) - (12+12) = -12
For the second option: b = 13, i = 0, d = 3, e = 16
population growth = (13+0) - (3+16) = -6
For the third option: b = 12, i = 20, d = 0, e = 8
population growth = (12+20) - (0+8) = 24
For the last option: b = 0, i = 14, d = 4, e = 10
population growth = (0+14) - (4+10) = 0
Hence, the last option is the correct option.
Answer:
d because i got a 100%
Explanation:
What is the atomic mass
of an atom of calcium,
Ca?
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:
create a hypothesis that can be tested in an experiment
CH4 + 2 02 - CO2 + 2 H2O
How many moles of carbon dioxide are produced from the combustion of 110 g of CH4?
answer: 6.875 moles
nCH4 = nCO2 = 110/(12 + 4) = 6.875
6.875 moles of carbon dioxide are produced from the combustion of 110 g of CH4.
What are moles?The mole is a SI unit of measurement that is used to calculate the quantity of any substance.
The reaction is
[tex]\rm CH_4 + 2O_2 = CO_2 + 2 H_2O[/tex]
To calculate the number of moles, we will use the following formula
[tex]\rm Number\;of \;moles= \dfrac{mass}{molar\;mass}\\\\\\\rm Number\;of \;moles= \dfrac{110g}{12 + 4 } =6.875[/tex]
Thus, the number of moles are 6.875.
Learn more about moles, here:
https://brainly.com/question/15209553
*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
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.
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:
What is the amount of heat absorbed when the temperature of 75 grams of water increases from 20 to 75
Answer:
55°C
Explanation:
original is 20
after gaining heat is 75
75 - 20 = 55
Answer:
17242,5J
Explanation:
Given parameters:
Mass of water = 75g
Initial temperature = 20°C
Final temperature = 75°C
Unknown:
Amount of heat absorbed = ?
Solution
To find the amount of heat absorbed by water;
H = mcΔt
m is the mass
c is the specific heat capacity of water = 4.18J/g°C
Insert the parameters and solve;
H = 75 x 4.18 x (75 - 20)
H = 17242,5J
What is the correct name for H5P2?
Answer:
Diphosphanium
Explanation:
mark brianliest