Answer:
6.022x10^23
Explanation:
calculate the molarity of the solution in a flask that contains 2.50 moles of potassium sulfate in 125 mL of solution
Answer:
0.02 M
Explanation:
Molarity = moles/volume (L)
125 mL =0.125L
M = 2.5/0.125 = 0.02 M
help !!! pretty please ❤️
Answer:
See below!
Explanation:
To find the symbol of the element, you have to use the periodic table.
The mass number is the number of protons and neutrons in the atom.
The atomic number is the number of protons in the atom.
You can find the number of protons from the periodic table.
You can find the neutrons by subtracting the mass number by the number of protons in the atom.
Unless you have an ion, you will have the same amount of electrons as you do protons.
To write in nuclear notation, you write the chemical symbol with the mass number and atomic number shown in the attachment. It is preferable to have the mass number and atomic number directly above each other.
Which term refers to the number of moles of solute per liter of solution?
Question 1 options:
mole fraction
saturation
concentration
molarity
Answer:
molarity
Explanation:
If 23.2 g of a given gas occupies a volume of 93.2 L at a particular temperature and pressure, what
mass of the gas occupies a volume of 10.4 L under the same conditions?
Answer:
2.59g
Explanation:
Using Avagadro's law equation as follows:
V1/n1 = V2/n2
Where;
V1 = initial volume (litres)
V2 = final volume (litres)
n1 = first amount of gas in grams
n2 = second amount of gas in grams
According to the information provided in this question, v1 = 93.2L, v2 = 10.4L, n1 = 23.2 g, n2 = ?
Using V1/n1 = V2/n2
93.2/23.2 = 10.4/n2
Cross multiply
93.2 × n2 = 23.2 × 10.4
93.2n2 = 241.28
n2 = 241.28/93.2
n2 = 2.588
n2 = 2.59g
The mass of the gas is 2.59g that occupies a volume of 10.4 L under the same conditions.
Avogadro's law equation:V₁/n₁ = V₂/n₂
Where
V₁ = initial volume (litres)
V₂ = final volume (litres)
n₁ = first amount of gas in grams
n₂ = second amount of gas in grams
Given:
V₁ = 93.2L,
V₂ = 10.4L,
n₁ = 23.2 g,
To find:
n₂ = ?
On substituting the values:
93.2/23.2 = 10.4/n₂
93.2 * n₂ = 23.2 * 10.4
93.2* n₂ = 241.28
n₂ = 241.28/93.2
n₂ = 2.588
n₂ = 2.59g
Thus, the mass of the gas is 2.59g.
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Fish can be killed by a sudden increase in water
A. Temperature
B. Level
C. Density
D. Color
Answer:
i think it is A
Explanation:
Answer:
Explanation:
A. Most definitly Temperature!
What are the similarities between a phylogenetic trees and cladograms.
Answer: A phylogenetic tree is an evolutionary tree that shows the evolutionary relationships between different groups of animals, Cladograms give a hypothetical picture of the actual evolutionary history of the organisms
Explanation: Hope this helps you out :)
how many molecules are present in a sample of carbon dioxide, CO2 with a mass of 168.2g?
Answer:
2.3 X 10^24 atoms CO2
Explanation:
Answer:
2.30 x10²⁴ molecules CO2
Explanation:
Convert mass of CO2 to moles
Convert moles of CO2 to molecules using Avogadro's number.
168.2 g CO2 x 1 mole CO2 / 44 g CO2 x 6.022 x10²³ molecules CO2 / 1 mole CO2
= 2.30 x10²⁴ molecules CO2
How many moles are there 75.56 grams of KHCO3
Explanation:
mole = mass/molar mass
molar mass of KHCO3 = K + H + C + O3
39 + 1 + 12 + 3(16)
= 100g/mol
mass = 75.56
mole = 75.56/100
= 0.7556mol
Which statement about Niels Bohr's atomic model is true?
O Higher orbits have lower energies.
Each orbit has a specific energy level.
Electrons can exist in any energy level.
O Orbits close to the nucleus have no energy.
Hurry.
Answer:
o
Explanation:
Answer:
Each orbit has a specific energy level.
Explanation:
Bohr model
Which terms correctly identify the indicated structures in this sketch of a cell viewed under a microscope? Match each label to the correct cell part. Question 5 options: Golgi Apparatus Nucleus Endoplasmic Reticulum Mitochodrion Ribosome Lysosome
1.
2.
3.
4.
5.
6.
Answer:
Hello I saw you guys were having trouble please put me as the brainiest
Explanation:
1. Golgi Apparatus
2. Nucleus
3. Endoplasmic Reticulum
4. Mitochondrion
5. Ribosome
6. Lysosome
The solubility of potassium sulfate in water is 16 grams per 100
milliliter at 50 degrees centigrade. The smallest amount of water
which will dissolve 4 grams of this substance at the same temperature
will be
The answer is 25 grams for this question
Glucose is produced through the process of photosynthesis
and is shown below. How many atoms of hydrogen are
present in one molecule of glucose?
6
3
12
24
As shown in the picture, the chemical formula for glucose is C6H12O6. This means that there are 6 carbons, 12 hydrogens and 6 oxygens in one molecule of glucose.
Your Answer: 12
true or false plz help
Answer:
True
animals can only reproduce sexually
Explanation:
Answer:
It's true, I said true the other time but someone already answered so that's why i couldn't answer right now
Explanation:
This is 10th grade Chemistry
Answer:
shift to restore equilibrium
Explanation:
Le Châtelier's Principle states that when a stress is applied to a system at equilibrium, the system will respond by shifting in the direction (either towards the products or reactants side) that opposes/ minimizes the effect of the stress.
Note that although the system tries to restore equilibrium, this equilibrium is a new equilibrium.
Equilibrium is the state of a reversible reaction when:
• two opposing reactions occur at the same rate;
• the concentrations of reactants and products are constant
The three types of intermolecular forces have different strengths. Rank
them from weakest to strongest.
How many grams are in 2.50 moles of copper?
Answer:
There are 63.546 grams in a 2.50 moles of copper.
Given the following reaction: 2N2O5=2N2O4+O2, if the rate of oxygen production is 0.15M/min, determine:
a. The rate that N2O5 is consumed
b. The rate that N2O4 is produced
Answer:
a. [tex]r_{N_2O_5}=-0.075M/min[/tex]
b. [tex]r_{N_2O_4}=0.075M/min[/tex]
Explanation:
Hello.
In this case, according to the balanced chemical reaction, we can write the law of rate proportions:
[tex]\frac{r_{N_2O_5}}{-2} =\frac{r_{N_2O_4}}{2} =\frac{r_{O_2}}{1}[/tex]
Thus, we proceed as follows:
a. Since the rate of oxygen production is 0.15 M/min, we can make the following setup:
[tex]\frac{r_{N_2O_5}}{-2} =\frac{r_{O_2}}{1}\\\\r_{N_2O_5}=\frac{r_{O_2}}{-2} =\frac{0.15M/min}{-2}\\\\ r_{N_2O_5}=-0.075M/min[/tex]
b. Since the rate of oxygen production is 0.15 M/min, we can make the following setup:
[tex]\frac{r_{N_2O_4}}{2} =\frac{r_{O_2}}{1}\\\\r_{N_2O_4}=\frac{r_{O_2}}{2} =\frac{0.15M/min}{2}\\\\ r_{N_2O_4}=0.075M/min[/tex]
Best regards!
This is 10th grade Chemistry
What kind of mixture is frozen
yogurt with sprinkles, fudge, and
gummy bears? How can you tell
Answer:
a heterogeneous mixture
Explanation:
I can see all of the different parts of the frozen yogurt, and if I were to pick up a gummy bear, it would come out. Thus, it is not fully/completely mixed with the other components.
It is a heterogenous mixture.
What is the difference between Homogeneous and Heterogeneous Mixtures ?A type of mixtures where all the components are mixed uniformly called as homogeneous mixture.
Here the Particles are distributed in an uniform way, called as solution. Example rainwater, vinegar.
It consist of one phase, It can’t be separated out physically
In heterogenous mixture, all the components are completely and equally mixed, particles can be seen under a microscope.
Here the Particles are distributed non-uniform way, Example: seawater, pizza, etc.
It can be in two or more phases and separated out physically
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Substances, such as litmus paper or red cabbage juice, that turn color based on the pH of the solution are called ___.
solutes
solutions
indicators
solvents
Answer:
soluteswws
Explanation:
in which group in the periodic table do we not find metal A.Group 1 B.Group 2 C.Group 3 D.Group 5
Answer:
Group 5
Explanation:
Using method of elimination:
A. Group 1
Also known as the Alkali metals group. It contains metals such as lithium and sodium. This option is incorrect.
B. Group 2
Also known as the Alkali Earth metals group. It contains metals such as Magnesium and calcium. This option is incorrect.
C. Group 3
It contains metals such as Aluminium and scandium. This option is incorrect.
D. Group 5
This is the correct option. The elements in these group are non metals. Examples include Nitrogen.
How much heat is needed to warm 250g of water from 22℃ to 98℃?
Answer:
Thus, the required heat is 79kJ 79 k J .
Explanation:
i think its the right bottem one
A tree is an example of an object that contains chemical energy
True or false
please help
Answer:
false
Explanation:
Hi hello I need help ASAP
Determine the slope of this line
a.2.5
b.0.75
c.1
d.0.4
Answer:
so I got it wrong the first time but you should pick two points on the line such as 4,3 and 9,5. Then use the equation y^2 - y^1/ x^2 - X^1. You would get 2/5 which is D.
Explanation
Can someone help me!!!!!
Answer:
Can u somehow make it bigger please?
Explanation:
The correct name for P2O5 is
a
b
phosphorus(ll) oxide
phosphorus(five) oxide
diphosphorus oxide
diphosphorus pentoxide
С
d
ANSWER
p2O5 is diphosphorus pentoxide.
Does anyone know how to do this?
Answer
find out the number of moles and use the molar ratio (numbers in front of formulas (in this case they are all 1) to determine how many moles of each product you are going to get theoretically
n=m/M is the equation to use to get moles here
30.8 gm/32.04 g/mol=0.9612 moles of the methanol and also of the formaldehyde so
0.9612 moles of the formaldehyde x molar mass (M) 30.73 g/mol= 29.54 gm which is the theoretical yield you already have the actual yield of 24.7 gm
then divide the actual by the theoretical to get the % yield which is 83.6%
Explanation:
What will a balloon do to a cloth if its negatively charged
Answer:
This involves negatively charged particles (electrons) jumping to positively charged objects. When you rub the balloons against the fabric they become negatively charged. They take some of the electrons from the fabric and leave them positively charged.
Explanation:
Negative charges attract to positive charges. If a balloon is not rubbed with the wool cloth, it has an equal amount of negative to positive charges, so it will attract to a rubbed balloon. When both balloons are rubbed with the wool cloth, the both receive negative charges, so they will repel each other.
What is the chemical formula for propane?
C38H
3C8H
C3H8
3CH8
Answer:
C38H
Thank You! :)
Describe a time in the group discussion when someone cited evidence from their research to make a point.
The role of the presenter in a group discussion to introduce information for the group to discuss.
What do you mean by group discussion?A discussion involving a number of people who are connected by some shared activity, interest, or quality.
Group discussion is a tool to test your teamwork skills, listening skills, discussion ability, subject knowledge, and communication.
Intrinsic skills like reasoning, speaking and time management come in very handy.
Skills that you can work upon include presentation, summarizing and people speaking.
The purpose of a group discussion is not to win an argument or to amuse your classmates.
The purpose of a discussion is to help each group member explore and discover personal meanings of a text through interaction with other people.
Learn more about group discussion here:
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Answer:
This happened when a nutritional question was presented. When asked a nutritional question, evidence was cited from one of the above sites to back up the answer.
Explanation: