The molarity of a 250. mL H2SO4 solution that was made from a 20.0 mL of a 10.0 M stock solution is 0.8M.
How to calculate molarity?The molarity of a solution can be calculated using the following expression:
CaVa = CbVb
Where;
Ca = concentration of acidCb = concentration of baseVa = volume of acidVb = volume of baseIn this question;
Ca = ?Va = 250mLCb = 10MVb = 20mLCa × 250 = 10 × 20
250Ca = 200
Ca = 200/250
Ca = 0.8M
Therefore, the molarity of a 250. mL H2SO4 solution that was made from a 20.0 mL of a 10.0 M stock solution is 0.8M.
Learn more about molarity at: https://brainly.com/question/2817451
19.5 g of NaCl occupy a volume of 29.5 mL. What is the molarity of the solution?
Round your answer to 1 decimal space, even if sig figs are not conserved.
(Please answer quickly)
Answer:
11.3 M
Explanation:
Na = 22.989 gm/mole
Cl = 35.45 gm/mole so Na Cl = 58.439 gm/mole
(19.5 / 58.439 )/ (29.5/1000) = 11.3 M
The modern day three little pigs will need to choose from the following materials to build their energy efficient home: Vibranium, Beskar, and Gundarium
order for the three little pigs to be successful in building an insulated home that loses as little heat as possible, they will need to choose the materal with ta
highest specific heat, Cp-
Vibranium
Choosing the material with the highest specific heat capacity is ideal and true.
What is Specific heat capacity?This is defined as the quantity of heat needed to raise the temperature per unit mass.
Insulators have a higher specific heat capacity as it takes more time for them to absorb heat thereby making it ideal in building an insulated home.
Read more about Specific heat capacity here https://brainly.com/question/26866234
The main purpose of the endocrine system is to produce:
A.
white blood cells.
B.
hemoglobin.
C.
neurons.
D.
hormones.
Answer:
hormones or D
Explanation:
:-)
Answer:
D. Hormones
Explanation:
Endocrine glands release hormones into the bloodstream. This lets the hormones travel to cells in other parts of the body.
Write a summary on how to use a light microscope
DUE TODAY PLEASE HELP.
Answer:
Step 1: Connect the light microscope to a power source. If your microscope uses a mirror instead of an illuminator, you can skip this step. Instead, find a place where natural light is easily accessible
Step 2: Turn the revolving nosepiece so the lowest objective lens is in position.
Step 3: Mount your specimen onto the stage. But before doing so, see to it that your specimen is adequately protected by placing a coverslip on top of it.
Step 4: Use the metal clips to keep your slide in place. Make sure the specimen is positioned in the center, right under the lowest objective lens.
Step 5: Look into the eyepiece and slowly rotate the coarse adjustment knob to bring your specimen to focus. See to it that the slide does not touch the lens.
Step 6: Adjust the condenser for the maximum amount of light. Since you're on the low power objective, you may have to decrease the illumination. Use the diaphragm under the stage to adjust.
Step 7: Now slowly rotate the fine adjustment knob until you obtain a clearer image of your specimen.
Step 8: Examine your specimen.
Step 9: After you're done viewing with the lowest power objective, switch to the medium power objective and re-adjust the focus with the fine adjustment knob.
Step 10: Proceed to the high power objective once you have it focused.
how many grams of hno3 would you need to prepare 5.5 l of this solution
8305 grams of HNO3 would be needed to prepare 5.5L of a solution. Details on how to calculate mass is found below.
How to calculate mass?The mass of a substance in a solution can be calculated using the following formula:
Density = mass ÷ volume
According to this question, 5.5L of a HNO3 solution is given.
Density of HNO3 is 1.51 g/cm³
Volume of HNO3 = 5500mL
1.51 = mass/5500
mass = 8305g
Therefore, 8305 grams of HNO3 would be needed to prepare 5.5L of a solution.
Learn more about mass at: https://brainly.com/question/19694949
Who is credited with arranging the periodic table?.
Russian chemist Dmitri Mendeleev
A compound contains only aluminum and carbon. 0.03 moles of this compound reacted with excess water to form 0.12 moles of AI(OH)3 and 0.09 moles of CH4 write a balanced equation for this reaction.
Explanation:
4Al+3C+H2O→4Al(OH)3+3CH4
Balanced reaction:- 4Al+3C+HH O→4Al(OH)3+3CH4
polease help 20pts
chemistry redox
Answer:
A is mg because it is losing 2 electrons
B is N2
C Mg as oxidation is lose of electrons
D is N2 as reduction is gain of electrons
Explanation:
you can easily remember as OIL RIG in term of electrons as Oxidation is Lost of electrons. Reduction is Gain of electrons.
Which state of matter of water is the most dense ?
A. Gaseous water vapor
B. Liquid water
C. Solid ice
D. Water and ice are equally dense.
Describe an experiment to determine rate of reaction
Answer:
Temperature. An increase in temperature typically increases the rate of reaction. An increase in temperature will raise the average kinetic energy of the reactant molecules.
If 86.4dm^3 of carbon dioxide gas contains N × 10^23 molecules at room temperature and pressure, find the value of N.
At T 25 ° C (298 K) and P 1 atm are stated by RTP ⇒ Vm = 24.4 liters / mol
86.4 dm³ = 86.4 L = 86.4/24.4 = 3.54 mol
1 mole = 6.02.10²³ molecules
3.54 x 6.02.10²³ = 21.31 x 10²³ molecules
N = 21.31
A liquid form of matter has less heat than when it is in __________ form.
solid
molecule
gas
PLEASE HELP!!!!
What are examples of pollution that can result from mining operations?
Answer:
Acid mine drainage
metal contamination,
increased sediment levels in streams
Explanation:
ACID MINE DRAINAGE
Mine waste, heavy metals and acidic water often end up in streams and rivers.
METAL CONTAMINATION
Heavy metals also affect the biodegradability of organic pollutants, making them less degradable and thus causing double the effect of polluting the environment.
Answer: salt and petroleum
Explanation:
Just took this today and im pretty sure this is the right one
Each of the colored lines in hydrogen's emission spectrum corresponds with the
A) energy released by the electrons as they orbit the nucleus.
B) the ionization energy of the electron when forming chemical bonds.
C) transition of an electron from a higher energy level to a lower energy level.
D) transition of an electron from a lower energy level to a higher energy level
when excited.
Each of the colored lines in hydrogen's emission spectrum corresponds with the C. transition of an electron from a higher energy level to a lower energy level.
What is an emission spectrum?An emission spectrum can be defined as the range of wavelengths, frequencies or pattern of bright lines which can be seen when the electromagnetic radiation that are emitted by an atom of a chemical compound (substance) moves through a spectrometer.
Generally, this process leads to the quantization or transfer of an electron from one energy level to another such as the transition of an electron from a energy level of higher magnitude to a lower energy level in hydrogen's emission spectrum.
Read more on electrons here: https://brainly.com/question/16554158
The solubility of solid substances generally ___________ as temperature increases. The solubility of gaseous substances generally ___________ as temperature increases.
Scientists who study objects in space (astronomers) often scan the sky using devices called radio telescopes. What can you conclude about these devices?
Question 10 options:
They send radio broadcasts out to distant stars and planets.
They pick up the radio waves emitted by stars, galaxies, and other objects in space..
They are less powerful than optical telescopes (telescopes that use visible light).
They can detect unltraviolet radiation
Automobile catalytic Converters use a platinum callus to reduce air pollution by changing emissions such as carbon monoxide CO2 to carbon dioxide CO2 the uncatalyzed reaction is represented by the balance inflation below 2 CO + 02 2CO2 + heat determine the number of moles of O2 reaction with 28 moles of CO during this reaction
Answer:
14 mol O₂
Explanation:
The reaction between CO and O₂ is the following:
CO + O₂ → CO₂
We balance the equation with a coefficient 2 in CO and CO₂ to obtain the same number of O atoms:
2CO + O₂ → 2CO₂
As we can see from the balanced equation, 1 mol of O₂ is required to react with 2 moles of CO. Thus, the conversion factor is 1 mol of O₂/2 mol CO. We multiply the moles of CO by the conversion factor to calculate the moles of O₂ that are required:
28 mol CO x 1 mol of O₂/2 mol CO = 14 mol O₂
what are two transition metals in the periodic table?
Answer:
two transitions elements are iron and cobalt
HELP ANYONE PLEASEE?? TY!!!
Answer:
so the order is grass, which gets eaten by the grasshopper, which is eaten by the frog, which gets eaten by the snake. grass wpuld be at top, snake at bottom.
Explanation:
hope this helps
In an ecosystem, the first trophic level is for grass followed by , grasshopper,snake and then frog.
What is an ecosystem?An ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by action of microbes nutrients are released back in to the soil.
Learn more about ecosystem,here:
https://brainly.com/question/13979184
#SPJ7
An atom is electrically neutral because
(a) neutrons balance out the protons and electrons.
(b) nuclear forces stabilize the charges.
(c) the number of protons and electrons are equal.
(d) the numbers of protons and neutrons are equal.
Answer:
c
Explanation:
neutrons have no charge
protons and electrons have opposite charges and balance each other out in equal numbers
Which type of bond forms when two or more atoms share electrons?.
Answer:
Covalent
Explanation:
Covalent is the sharing of electrons and Ionic is transferring of electrons.
Answer:
Covalent bonds
Explanation:
the interatomic linkage that results from the sharing of an electron pair between two atoms
Calculate the concentration of
5 g of sugar dissolved in 20 cm of water
Answer:
25%
Explanation:
I assume you menat 20 cm^3 of water
5 gm / 20 gm = 25 %
The exploration of the mid-cayman rise is intended to discover _______. a. what life may have been like before the evolution of photosynthesis b. the origins of photosynthesis c. life in shallow, coastal regions d. the chemical composition of undersea mountains
The exploration of the mid-cayman rise is intended to discover that what life may have been like before the evolution of photosynthesis.
What is mid - cayman rise?Mid - cayman rise is an area or era where only some amount of light is coming but still existence of life is present there.
As we know that plants make their own food by the process called photosynthesis in the presence of light, but this is not the scenario for all the time. Before the discovery of photosynthesis plants also prepared their own food.
Hence, option (a) is correct.
To know more about photosynthesis, visit the below link:
https://brainly.com/question/4341036
Answer:
A
Explanation:
Which functional group is used in other functional groups?
Explanation:
a substituent or moiety in a molecule that causes the molecule's characteristic chemical reactions
A certain gas has a volume of 500.0 ml at 77.0c and 600.0 torr. calculate the temperature if the volume decreased to 400.0 ml and the pressure is increased to 760. torr and assume the number of moles does not change.
As the volume is decreased and the pressure is increased to the given value, the temperature of the gas increases to 81.67°C.
Given the data in the question;
Initial volume of gas; [tex]V_1 = 500.0ml = 0.5L[/tex]Initial pressure; [tex]P_1 = 600.0torr = 0.789474atm[/tex]Initial temperature; [tex]T_1 = 77.0^oC = 350.15K[/tex]Final Volume; [tex]V_2 = 400.0ml = 0.4L[/tex]Final pressure; [tex]P_2 = 760torr = 1.0atm[/tex]Final temperature; [tex]T_2 =\ ?[/tex]Combined gas lawCombined gas law brings together both Boyle's Law, Charles's Law, and Gay-Lussac's Law. It states that "the ratio of the product of volume and pressure and the absolute temperature of a gas is equal to a constant.
It is expressed as;
[tex]\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}[/tex]
We substitute our given values into the expression above to determine the new temperature.
[tex]\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}\\\\P_1V_1T_2 = P_2V_2T_1\\\\T_2 = \frac{P_2V_2T_1}{P_1V_1}\\T_2 = \frac{1.0atm\ *\ 0.4L\ *\ 350.15K}{0.789474atm\ *\ 0.5L} \\\\T_2 = \frac{140.06LatmK}{0.394737Latm}\\ \\T_2 = 354.82K\\\\T_2 = 81.67^oC[/tex]
Therefore, as the volume is decreased and the pressure is increased to the given value, the temperature of the gas increases to 81.67°C.
Learn more about the combined gas law here: brainly.com/question/25944795
What best describes these three molecules? they are not isomers. they are structural isomers. they are geometric isomers. they are both structural and geometric isomers.
Answer:
B
Explanation:
Answer:
The correct answer is B.
They are structual isomers.
Gene therapy is a form of
.
(40) If a hypothesis is proven correct, a theory is formulated.
True or false
Answer: False, I believe.
Explanation: If a Hypothesis is proven correct, then another experiment to strengthen that Hypothesis is should be done.
10. How many molecules are contained in 5.6 L of H2 at STP?
Answer:
1 mole of any material contains 6.023×1023 elementary particles. Hence, by ratio and proportion, 5.61mol of diatomic hydrogen gas contains 5.61×6.023×1023 hydrogen molecules =3.3789×1024 H2 molecules.
Explanation:
I rounded the answer but can you help me?
