What is the concentration if 20 grams of NaOH was dissolved in enough water to make a 250 mL NaOH solution?
Answer: 1 molar NaOH contains 40 grams of NaOH per every liter of water
Explanation:
so 2 M NaOH contains twice that amount, ie. 80 grams per liter. Then, ine 250 ml of weater, there should be 80/4 = 20 grams of solid NaOH dissolved.
the atomic number is the number of protons, but in a neutral atom it is also the number of _____. A. none of these B. electrons C. neutrons D. nuclei
Answer:
Electrons
hope it helps
How many rays are needed to be
drawn to determine the location of
the image?
)
two
three
four
Answer:
two
Explanation:
Every observer would observe the same image location and every light ray would follow the law of reflection. Yet only two of these rays would be needed to determine the image location since it only requires two rays to find the intersection point.
pls name braainly :)
The graph shows a heating curve for water.
Which point on the graph indicates that all of the liquid water has been converted to water vapor?
1
2
3
4
Answer:
4
Explanation:
water starts to boil into water vapor at 100'C. at this point, temperature becomes costant at 100'C as heat energy is used up by the particles to overcome the intermolecular forces between the molecules.
once the forces holding the particles together have been overcome, the temperature will start to rise again showing that all the liquid water has been converted into water vapor
which tempature is warmer than the freezing point in water?
Answer:
1c
Explanation:
Decay chains exist because
radioactive elements remain radioactive regardless of decays.
radioactive elements require multiple decays in order to release all of their radiation.
radioactive elements can decay into stable or unstable elements.
radioactive elements require large amounts of time to decay to a stable element.
Answer:
Find the length of side x in simplest radical form with a rational denominator.
Answer:
The answer is C
radioactive elements can decay into stable or unstable elements.
A gas of certain mass occupies a volume of 650cm^3 under a pressure of 750 mm Hg. Calculate the pressure under which the volume of gas will be reduced by 10 percent of its original volume.
Answer:
7500 mmHg
Explanation:
From the question,
Applying Boyles Law,
PV = P'V'................ Equation 1
Where P = original pressure, P' = final pressure, V = Original Volume, V' = Final Volume.
make P' The subject of the equation
P' = PV/V'.............. Equation 2
Given: P = 650 cm³, P = 750 mmHg, V' = (650×10/100) = 65 cm³ (Reduced by 10 percent of it original volume)
Substitute these values into equation 2
P' = (650×750)/65
P' = 7500 mmHg
Based on the properties in Table 1, which example describes the best use of nitinol in a manufactured product?
Answer: D- making flexible eyeglass frames
Explanation: my powerful mind
distinguish between climate and atmosphere.
Water cannot dissolve all substances that are made from ionic bonds. This is probably because
A.
Water needs to be stirred to dissolve all ionic substances
B.
Some ionic bonds are too strong for the attractions of water molecules to pull them apart
C.
Some water molecules are not as strong as others
Water cannot dissolve all substances that are made from ionic bonds probably because some ionic bonds are too strong for the attractions of water molecules to pull them apart.
WATER AS A UNIVERSAL SOLVENT:Water is a unique molecule often referred to as a universal solvent because it can dissolve almost all solutes. Water is capable of dissolving polar substances i.e. substances that have an unequal distribution of positive and negative ions.However, some ionic bonds formed from ions of elements are unable to be dissolved by water and this is probably attributed to the fact that those bonds are too strong to be pulled apart by water molecules.
Learn more about at ionic compounds at: https://brainly.com/question/9167977
How can I express the composition of a solution?
Answer:
It can be expressed in several ways: molarity (moles of solute per liter of solution); mole fraction, the ratio of the number of moles of solute to the total number of moles of substances present; mass percentage, the ratio of the mass of the solute to the mass of the solution times 100; parts per thousand (ppt), grams ...
Explanation:
It can be expressed in several ways: molarity (moles of solute per liter of solution); mole fraction, the ratio of the number of moles of solute to the total number of moles of substances present; mass percentage, the ratio of the mass of the solute to the mass of the solution times 100; parts per thousand (ppt), grams ...
An example of a non-electrolyte is
1. H2O (I)
2. NaCl (aq)
3. K2SO4 (aq)
4. HCI (aq)
Answer: H2O
Explanation: pure H2O does not contain ions which could
Transfer charge. Other substances in water solution forms ions.
An atom has 13 protons, 14 neutrons, and 10 electrons. What element is this atom? How did you determine which element it was?
28 What is the concentration of hydrogen ions [H+] in a solution that has a pH of 4.32? (1 Point) a. 4.8 x 10-5M b. 6.2 x 10-4M C. 5.1 x 10-4M d. 8.6 x 10-5M
Answer: The concentration of hydrogen ions in the given solution is [tex]6.2 \times 10^{-4}[/tex].
Explanation:
Given : pH = 4.32
pH of a substance or solution is the negative logarithm of hydrogen ion concentration.
[tex]pH = - log [H^{+}][/tex]
Substitute the value into above formula as follows.
[tex]pH = - log [H^{+}]\\= - log (4.32)\\= 6.2 \times 10^{-4}[/tex]
Thus, we can conclude that the concentration of hydrogen ions in the given solution is [tex]6.2 \times 10^{-4}[/tex].
A geologist conducts an investigation to determine the absolute age of a fossil. She then
repeats the procedure three times. Which BEST explains why she repeated the procedure
several times?
•It helps her develop better procedures
•It improves the accuracy of the results.
•She wants all the results to be different.
•She has more than one hypothesis to prove.
Answer:
it improves the accuracy of the results
A home is heated by a system that uses sunlight to warm water in pipes. Which statement best describes this system?
A. An active solar system because sunlight shines on the pipes naturally.
B. A passive solar system because light from the sun generates electrical energy.
C. An active solar system because the sun's energy is collected and moved throughout the house.
D. A passive solar system because sunlight heats the home without generating electrical energy.
Answer:
In which part of a nuclear power plant does fission take place? A home is heated by a system that uses sunlight to warm water in pipes. Which statement best describes this system? An active solar system because sunlight shines on the pipes naturally.
Explanation:
Hope it helps
FOLLOW MY ACCOUNT PLS PLS
Answer:
In which part of a nuclear power plant does fission take place? A home is heated by a system that uses sunlight to warm water in pipes. Which statement best describes this system? An active solar system because sunlight shines on the pipes naturally.
Explanation:
how does farming affect or change Earth systems? Give at least 3 examples.
Answer:
1.Exhaust from farming machines pollutes the air
2.Cows give off methane gas that gets into the atmosphere
3.The land the farm was cleared away on effects other recosystems
Explanation:
Farming adversely affected the earth systems such as climate change, deforestation, biodiversity loss, irrigation problems, pollutants, soil degradation, and waste production.
How does farming affect or change Earth systems?Agriculture causes a number larger of environmental issues that cause environmental degradation such as climate change, deforestation, biodiversity loss, irrigation problems, pollutants, soil degradation, and waste production.
For example, exhaust from farming machines pollutes the air, Cows give off methane gas that gets into the atmosphere and the land the farm was cleared away on effects other ecosystems.
So we can conclude that farming adversely affected the earth systems such as climate change, deforestation, biodiversity loss, irrigation problems, pollutants, soil degradation, and waste production.
Learn more about farming here: https://brainly.com/question/17392167#
How many grams of C3H8
must be used to produce
3.75 X 1024 molecules of CO2 gas?
C3H8 + 5O2 → 3CO2 + 4H2O
Answer:
91.28 g
Explanation:
The mass of C₃H₈ used is 91.08g
What is Mole?
The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter.
A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g.
Given,
Molecules of carbon dioxide = 3.75 × 10²⁴
We know that,
1 mole = 6.023 × 10²³ molecules
Moles of carbon dioxide = 3.75 × 10²⁴ ÷ 6.023 × 10²³
= 6.226 moles
From the reaction, 3 moles of carbon dioxide is produced by 1 mole of C₃H₈.
So, 6.226 moles will be produced by (1 ÷ 3) × 6.226
= 2.07 moles of C₃H₈
Mass of C₃H₈ = moles × molar mass
= 2.07 × 44
= 91.08g
Therefore, mass of C₃H₈ used is 91.08g
Learn more about Moles, here:
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In a pedigree, when a circle of square is halfway shaded, is it
A(female
B(male
C(carrier
D(non carrier
im planning to tell a girl i like her how should i do it?
One molecule of a compound weighs 2.93 10–22 g. The molar mass of this compound is:
A)
2.06 g/mol
B)
567 g/mol
C)
168 g/mol
D)
176 g/mol
E)
none of these
Answer:
176 g/mol
Explanation:
To get this, multiply the weight of the molecule by Avogadro's number:
(2.93×[tex]10^{-22}[/tex]) × (6.022×[tex]10^{23}[/tex]) = 176.44 g/mol
If you are at the top of Mount Everest, can you have a really hot cup of hot chocolate?
Answer:
Yes, you can
Explanation:
When you climb Mount Everest, you need lots of energy. The higher you climb, the more your appetite goes down. You will need as much energy as you can get.
please answer! will mark brainiest for correct answer!
Answer:
when the electron moves from the first orbit to the third it gains energy but when it jumps from a higher energy orbit to a lower the energy is being radiated. So whihever is the higher energy you know what it is.
Explanation:
Answer: So ever is the higher energy you know what it is.
Explanation:
Where do we get our energy from ?
Answer:
energy
Explanation:
CHEMISTRY QUESTION 20 pts.... URGENT
Answer:
E i is like Math so I think this will help you
How many moles are in 558 grams of Hydrofluoric acid? please show dimensional analysis
Answer:
29.4mol
Explanation:
Using mole = mass ÷ molar mass
Molar mass of HF (hydrogen fluoride) = 1 + 19 = 20g/lol
Using the formula;
Mole = mass/molar mass
Mole = 588/20
Mole = 29.4mol
Answers are either: 10.4g, 5.18g, 37.3g, 26.4g, 20.7g
Answer:
20.7 g NH3
Explanation:
Convert to moles of N2:
(17.0 g N2) / (28.02 g/mol N2) = 0.607 moles N2
Convert to moles of NH3:
(0.607 moles N2)(2 moles NH3 / 1 mole N2) = 1.213 moles NH3
Convert to grams of NH3:
(1.213 moles NH3)(17.03 g/mol NH3) = 20.66 g NH3
Explain how the skeletal and muscular system work together to support body movement from this picture.
Answer:
Tendons connect the skeletal system to the muscular system by attaching muscle to bone. When muscle contracts, the tendon acts on the bone, causing movement. Joints, the point at which two or more bones connect, can be fixed, slightly movable, or freely movable.
Help I need help with this :(
Answer:
biomass is a plant of animal material used as fuel to produce electricity
Tidal power is energy harnessed by converting engery from tides
That's what I know so far and took notes on hope it helped:)
I need help bad bro i have a 30 cs this is missing
Answer: 11.02 moles of Ag can be formed.
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} Cu=\frac{350.00g}{63.55g/mol}=5.51moles[/tex]
The balanced chemical equation is:
[tex]Cu+2AgNO_3\rightarrow Cu(NO_3)_2+2Ag[/tex]
According to stoichiometry :
1 moles of [tex]Cu[/tex] produces = 2 moles of [tex]Ag[/tex]
Thus 5.51 moles of [tex]Cu[/tex] will produce=[tex]\frac{2}{1}\times 5.51=11.02moles[/tex] of [tex]Ag[/tex]
Thus 11.02 moles of Ag can be formed.
