30 points please help
Answer:
its D I'm pretty sure because it's from high heat/pressure
12) Balance the following chemical equation:
Zn +
H3PO4
Zn3(PO4)2 +
H2
Answer:
Sorry I am not very good at chemistry.
Explanation:
How many molecules of CrCl₃ are produced when 2.89 moles of CuCl₂ react? *
2Cr+3CuCI2-2CrCI3+3Cu
Explanation:
The reaction is CaCO
3
+2HCl→CaCl
2
+H
2
O+CO
2
.
Thus, 2 moles of HCl reacts with one mole of calcium carbonate to produce one mole each of calcium chloride, water and carbon dioxide respectively.
Hence, 3 moles of HCl will react with excess of calcium carbonate to produce 3×
2
1
=1.5 mol of carbon dioxide
The following symbol (<-->) means
Answer:
Greater than or less than
How many grams of NaOH would be required to make 1.0 L of a 1.5 M solution
7. Where do amino acids reside ?
Answer:
Explanation:
Polar side chains tend to be present on the surface of a protein where they can interact with the aqueous environment found in cells. On the other hand, non-polar amino acids tend to reside within the center of the protein where they can interact with similar non-polar neighbors.
What are the [H+] and [OH-] for a substance with a pH of 9.2? Show work please
Explanation:
[H+]=10^-pH
[H+]=10^-9.2
[H+]=6.031x10^-10
[OH-]=1x10^-14÷[H+]
[OH-]=1x10^-14÷[6.031x10^-10]
[OH-]= 1.66x10^-5
im pretty sure this is right
Look at the images of Mars below. choose three features from the images and explain why they provide evidence thatt there is or was water on Mars. NEED HELP ASAP. (Will mark Brainlist)
Answer:
Spot (4) Has evidence that there were waves here at some point. It looks as if the sand/surface debris was moved back and forth, creating this pattern in the sand. Spots (5) and (7) show evidence of water erosion. The smooth edges of both hills mean that water once flowed through that area, carrying little pebbles and rocks that gradually shaped and smoothed those mounds. An example for this would be how there are smooth areas in the Grand Canyon where scientists have concluded that some, if not all, of the Grand Canyon was formed by flowing water. "Rapid uplift, cracking, and surface drainage of receding floodwaters provide both the path and the necessary volume of water to quickly carve out Grand Canyon," says scholars on icr.org.
Explanation:
Water Erosion exists.
Which one of the following to all methods of heat transfer require?
a. A difference in thermal energy
b. A liquid or gaseous state
c. Direct physical contact
d. The movement of particles
Answer:
A
Explanation:
A difference in thermal energy
The study of chemicals is called chemistry.
The correct answer is A.
According to the law of thermodynamics, It states that heat transfers from the high temperature to the low temperature.
According to the question, heat transfer must require the temperature difference between the two systems and allow to flow from high temperature to low temperature.
Hence, the correct answer is A that is a difference in thermal energy
For more information, refer to the link:-
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50 points if its right In the Northern Hemisphere, choose ALL that apply
Question 2 options:
Summer solstice occurs when the Earth's North Pole is tilted toward the sun.
Fall and Spring Equinoxes occur when days and nights are equal in length.
The tilt and revolution of the Earth causes the seasons
Winter solstice occurs when the Earth's North Pole is tilted away from the sun.
Answer:
All are correct
Explanation:
I took the test
Answer: pick all
Explanation:
i got 100% on my qiuz
Which element has chemical properties most similar to carbon (C)?
A. Lithium
B. Silicon
C. Titanium
D. Neon
Answer:
b
Explanation:
Silicon has the chemical properties that are most similar to those of carbon
UGRENT! Please help showing all work
Answer:
a. Oxygen
b. 2.62 g of NO
c. 85.2%
Explanation:
Let's see the presented reaction:
4NH₃ + 5O₂ → 4NO + 6H₂O
4 moles of ammonia react to 5 moles of oyxgen in order to produce 4 moles of NO and 6 moles of water.
To determine limting reagent, we need moles of each reactant. Let's calculate them:
3.25 g /17 g/mol = 0.191 moles
3.50 g /32 g/mol = 0.109 moles
4 moles of amonia react to 5 moles of oxygen
Then, 0.191 moles will react to (0.191 . 5) / 4 = 0.238 moles
We only have 0.109 moles available and we need 0.238, so the oxygen is the limting reactant.
5 moles of O₂ can produce 4 moles of NO
So, our 0.109 moles will produce (0.109 . 4) /5 = 0.0872 moles
We convert the moles to mass: 0.0872mol . 30g/mol = 2.62g
(Yield produced / Theoretical yield) . 100 = %
(2.23g / 2.62g) . 100 = 85.2%
Most of Earth's atmosphere is made up of nitrogen gas. Nitrogen can also
exist as a solid, liquid, or plasma. Four samples of nitrogen are each in a
different state but have the same mass. Which statement about the relative
amounts of thermal energy in the samples is true?
Answer:
it should be B (i did this wrk before)
Explanation:
How many grams of CO 2 are present in a container with a volume of 5.61 L if the gas exhibits a pressure of 5.66 atm at a temperature of 311 K?
Answer:
54.72 g
Explanation:
Mass = ?
Volume = 5.61 L
Pressure = 5.66 atm
Temperature = 311 K
The relationship between these equations is given by the ideal gas equation;
PV = nRT
where R = gas constant = 0.0821 atm L K-1 mol-1
n = PV / RT
n = 5.66 * 5.61 / (0.0821 * 311 )
n = 1.2436 mol
Number of moles = Mass / Molar mass
Mass = Number of moles * Molar mass = 1.2436 * 44 = 54.72 g
This is hard, isn't it? please help me though. PLEASE
Which kingdom does spiny lobster, and diatom belong to?
Answer: The spiny lobster belongs to the kingdom ANIMALIA while diatoms belongs to the kingdom PROTISTA.
Explanation:
There are different ways biologists have used to examine and describe million kinds of living organisms. To classify organisms into groups, biologist look for important features that are shared by a large variety of organisms. These features which should have similar origin, structure and position. Organisms with certain important features in common are then put together into one group.
In the hierarchy of living organisms, the largest group of organisms is the KINGDOM. There are five types of kingdoms in which organisms are grouped, these includes:
--> kingdom Monera
--> kingdom PROTISTA,
--> kingdom fungi,
--> kingdom plantae and,
--> kingdom ANIMALIA.
Kingdom PROTISTA: they are single-celled, motile or non-motile organisms that are made up of eucaryotic cells, that is,cell structure is complex with a definite nucleus. Member include the DIATOMS, amoeba and chlamydomonas.
Kingdom ANIMALIA: They are multiple-celled, motile organisms that feed on other organisms. Their cells have no cell walls. The members include the SPINY LOBSTER, corals,worms, snails and cows
When determining an Empirical formula
a)you must change everything to percentages
b)you must use Avogadro's number
c)you must convert grams to moles
d)you must balance the equation
A H2CO3 (aq) ---> CO2 (g) + H2O (l) B H2SO4 (aq) + 2NaOH (aq) ---> Na2SO4 (aq) + 2H2O (l) C 2H2 (g) + O2 (g)----> 2H2O (l) D AgNO3 (aq) + NaOH (aq) ---> AgOH (s) + NaNO3 (aq) Which equation above represents a precipitation reaction?
Answer: [tex]AgNO_3(aq)+NaOH(aq)\rightarrow AgOH(s)+NaNO_3(aq)[/tex]
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
A double displacement reaction in which one of the product is formed as a solid is called as precipitation reaction.
The equation which represents a precipiation reaction is:
[tex]AgNO_3(aq)+NaOH(aq)\rightarrow AgOH(s)+NaNO_3(aq)[/tex]
1. All the individuals of one type of clownfish ( e. species) living in a reef compose which level of organization?
A B C D ............
Answer:
I think gamma, I'm not sure tho
help..................
Answer:
Volcanic eruption
Explanation:
a crater is this bowl shaped hole in the ground, and it is caused by a meteorite or volcanic activity
The sound of a trumpet ECHOES off a nearby mountain. This is which type of wave interaction?
Answer:
reflection
Explanation:
wave reflection is when a sound bounces off something it cannot go through, like echoing
Find the mass of 1.59 mol of NH3.
Please show the work if you can!
Answer:
25.4/km=3
Explanation:
How do changes to genes in body cells differ from changes to genes in egg and sperm cells?
Answer:
These genetic changes are not present in a parent's egg or sperm cells, or in the fertilized egg, but happen a bit later when the embryo includes several cells. As all the cells divide during growth and development, cells that arise from the cell with the altered gene will have the mutation, while other cells will not.
Explanation:
Name the 6 kinetic factors
What organelle is sac like and stores different materials?
Group of answer choices
endoplasmic reticulum
vacuoles
ribosomes
Golgi Body
In the Haber reaction shown below, _______?is the
limiting reactant if equal moles of each reactant are used.
3H2 + N2 -> 2NH3
Answer: hydrogen
Explanation:
Drag each item to show if it is matter or not matter.
light bulb added to
sunlight
heat
lamp
matter
light bulb
not matter
How many atoms of K are present in 195.49 grams of K?
Answer:
A- 3.0110 X 10^24
Explanation:
I took the quiz
The term mole concept is used here to determine the number of atoms of potassium. The number of atoms of potassium present in 195.49 grams is 3.011 × 10²⁴.
What is a mole?One mole of a substance is defined as that quantity of it which contains as many entities as there are atoms exactly in 12 g of carbon - 12. The formula used to calculate the number of moles is given as:
Number of moles of atoms (n) = Given mass / Gram atomic mass
The given mass of potassium = 195.49 g
The atomic mass of 'K' = 39.098 g
n = 195.49 / 39.098 = 5 mol
Number of atoms = Number of moles of atoms × 6.022 × 10²³
5 mol × 6.022 × 10²³ = 3.011 × 10²⁴
Thus the number of atoms is 3.011 × 10²⁴ .
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How many moles of NaCl are contained in 100.0 mL of a 0.20 M solution?
Answer:
0.02 mol.
Explanation:
