Answer:
sunscreens helps of nut burning and the weakness it has polymen so it's bas
Question 5
If 0.664 g of an acid was required to neutralize 10.0 mL of 0.800 M NaOH,
calculate the Molar Mass of
the acid given it reacts with sodium hydroxide in a 1:2 istio.e., 1 ACID : 2 NaOH. (3)
The molar mass of the acid is 83 g/mol
StoichiometryFrom the question, we are to determine the Molar mass of the acid.
From the given information,
The acid reacts with sodium hydroxide in a 1:2 ratio
This means 1 mole of the acid reacts with 2 moles of sodium hydroxide
First, we will calculate the number of moles of NaOH present.
Volume of NaOH = 10.0 mL = 0.01 L
Concentration of NaOH = 0.800 M
Using the formula,
Number of moles = Concentration × Volume
Number of moles of NaOH present = 0.800 × 0.01
Number of moles of NaOH present = 0.008 moles
If, 1 mole of the acid reacts with 2 moles of sodium hydroxide
Then,
0.004 moles of the acid will react with the 0.008 moles of sodium hydroxide
Thus, number of moles of the acid that reacted is 0.004 moles
Now for the Molar mass of the acid
From the formula,
[tex]Molar\ mass = \frac{Mass}{Numbber\ of\ moles}[/tex]
From the given information,
Mass of the acid = 0.664 g
Therefore,
[tex]Molar \ mass \ of \ the \ acid \ = \frac{0.664}{0.004}[/tex]
Molar mass of the acid = 166 g/mol
Hence, the molar mass of the acid is 166 g/mol
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What happens to energy when light is transmitted through or reflected off a material?
Answer:
The light wave could be absorbed by the object, in which case its energy is converted to heat.
Explanation:
How many moles in 49.8 Liters of O, at STP?
Answer:
2.22 mole
Explanation:
At STP one mole of an ideal gas occupies 22.4 L of volume.
Hence,
Volume = mol × 22.4 L/mol
solving for mole,
Mole = Volume / 22.4 L/mol
Putting values,
Mole = 49.8 L / 22.4 L/mol
Mole = 2.22 mole
Which type of energy does an object in motion have? electrical energy ionic energy kinetic energy potential energy.
Answer:
it's kenetic energy
Explanation:
Kinetic energy is a form of energy that an object or a particle has by reason of its motion.
C. kinetic energy
I need a 20 character limit so here's more words
please answer this question fast!
Answer:
The answer is C for sure!
Explanation:
In the picture we have the electrons given, so we have to determine the nucleons and protons.
When a 50 mL sample of C2H5OH is mixed with a 50 mL sample of H2O, the resulting mixture has a volume of 95 mL, and the container is warm to the touch. Which of the following best describes these observations?
A chemical reaction occurs, as evidenced by the volume of the resultant mixture being less than the total volume of the initial components
A chemical change occurs, as evidenced by the formation of new covalent bonds releasing more energy than is absorbed by the breaking of the existing covalent bonds
A physical change occurs, and the solvation process is exothermic
A physical change occurs, and the solvation process is endothermic.
The statement that best describes these observations is : ( C )
A physical change occurs and the solvation process is exothermic Solvation processThe mixture of a sample of C₂H₅OH and water is a solvation process ( interaction between solute and solvent ) which is a physical change and the level of solvation depends on the solvent ( water ) polarity.
The container been warm after the mixture sows that some heat is expensed into the surrounding ( exothermic reaction ). therefore we can conclude that a physical change has occurred and the solvation process is exothermic.
Hence we can conclude that the statement that best describes these observations is : A physical change occurs and the solvation process is exothermic.
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How does the jet stream over the United States change by season?
Jet streams are always changing: moving to higher or lower altitudes, breaking up, and shifting in flow, depending on the season and other variables, such as energy coming from the sun. Air north of a jet stream is typically colder, while air to the south is usually warmer
How many moles of lithium chloride will be formed by the reaction of chloride with 4.28 mol of lithium bromide in the following reaction (below)? *
Answer:
The answer is 4.28 moles
Explanation:
This is super easy okay, you won't forget this!
Basically mole ratios, we're just looking at the coefficients in front of the compounds, multiplying them, and dividing them as we see fit.
In this example, you can see how you need 2 moles of lithium bromide (LiBr) for the reaction, and 2 moles of lithium chloride (LiCl) will be produced.
Basically, the molar ratio is when you divide numbers and see how much of this do I have for that (if that makes sense).
So if you were to divide the 2 moles of LiBr / 2 moles of LiCl = 1. So we know that the mole ratio for LiBr to LiCl is 1:1 or 2:2, either or, it's the same thing.
SO THE BIG IDEA, if we have 4.28 moles of lithium bromide reacting, we should also have 4.28 moles of lithium chloride produced, BECAUSE the mole ratio is 1:1.
I hope this makes sense please tell me if it doesn't, I will try my best to explain a little more.
Plz help!!! This is timed!!!
the process of moving or being moved?
Answer:
motion
Explanation:
Answer:
The answer is
→ The process of movement/motion.
Explanation:
Movement/motion is when you change places from where you currently are.
Therefore, movement/motion is your answer.
Hope this helped! :^)
____________ is a point source of water pollution; _____________ is a nonpoint source of water pollution.
Answer:
good afternoon
Explanation:
thanks I will send
The molar mass of copper(II) chloride (CuCl2) is 134. 45 g/mol. How many formula units of CuCl2 are present in 17. 6 g of CuCl2? 7. 88 × 1022 formula units 1. 84 × 1023 formula units 1. 91 × 1023 formula units 1. 42 × 1024 formula units.
The number of formula units in the 17.6 g copper (II) chloride sample is [tex]7.88\;\times\;10^2^2[/tex]option A is correct.
The formula unit is given as the molecule of the compound with constituent atoms and bonds.
Computation for the number of formula unitsThe number of formula units in a mole of sample is equal to the Avogadro number. The Avogadro number is a constant with the value of [tex]6.023\;\times\;10^2^3[/tex].
Thus, the number of formula units in copper (II) chloride are:
[tex]\rm 1\;mol=6.023\;\times\;10^2^3\;formula\;unit\\134.45\;g/mol=6.023\;\times\;10^2^3\;formula\;unit[/tex]
The given mass of copper chloride is 17.6 g. The number of formula units is given as:
[tex]\rm 134.45\;g=6.023\;\times\;10^2^3\;units\\\\17.6\;g=\dfrac{6.023\;\times\;10^2^3}{134.45}\;\times\;17.6\;units\\\\ 17.6\;g=7.88\;\times\;10^2^2\;units[/tex]
The number of formula units in the 17.6 g copper (II) chloride sample is [tex]7.88\;\times\;10^2^2[/tex] units.
Thus, option A is correct.
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What was the ball's average speed during the time represented on the graph?
A) 0.2 m/s
B) 0.5 m/s
C) 5.0 m/s
D) 10.0 m/s
Answer:
Explanation:
0.5 i go to k12 i jus took the test
Answer:
0.5
Explanation:
took the test
How many moles are in 7.5 x 10^19 molecules of ammonia, NH3?
this is timed help
Answer:
Avogadro's number represents the number of units in one mole of any substance. This has the value of 6.022 x 10^23 units / mole. This number can be used to convert the number of atoms or molecules into number of moles. We do as follows:
10 mol NH3 ( 6.022 x 10^23 molecules / 1 mol ) = 6.022x10^24 molecules NH3
Calculate the molality of a sucrose solution made by dissolving 37.4 grams sucrose into 94.2 grams water. The molar mass of sucrose is 342.2 g/mol. Record your answer in scientific notation using 3 significant figures
The molality of the sucrose solution is 1.16 m
Definition of molalityThe molality of a solution is defined as the mole of solute per unit kilogram (Kg) of water. Mathematically, it can be expressed as:
Molality = mole / mass (Kg) of water
How to determine the mole of sucrose Mass of sucrose = 37.4 gMolar mass of sucrose = 342.2 g/molMole of sucrose =?Mole = mass / molar mass
Mole of sucrose = 37.4 / 342.2
Mole of sucrose = 0.109 mole
How to determine the molality Mole of sucrose = 0.109 moleMass of water = 94.2 g = 94.2 / 1000 = 0.0942 KgMolality =?Molality = mole / mass (Kg) of water
Molality of sucrose = 0.109 / 0.0942
Molality of sucrose = 1.16 m
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HELP ASAP!! WILL MARK BRAINLIEST !!
Calculate the percent composition for the following compounds: Ca3(PO4)2
Answer:
The question is incomplete.
[tex]{ \tt{\% \: composition = \frac{molar \: mass}{molecular \: mass} \times 100\%}} \\ [/tex]
An analytical chemist is involved with
Answer:
basic laboratory research, perform process and product development
Explanation:
good luck <3
1-What is a Siphon tube used for ?
Answer:
used in irrigation to transfer water over a barrier
Do you think flowers are important to mindkind? If yes explain why in your own words please it would mean a lot!!
Answer:
Flowers play a crucial role in our lives; they have been used for generations to express the thoughts and feelings words cannot fully explain. Mother nature is the short term used to describe how nature gives life and nurture as a mother does for her children. As humans, we are part of mother nature's plan. We are also connected to plants and flowers, and some of the benefits have been passed to the next generation and will always be. We can control the air that we breathe, the aura around us, how we feel, and the things we attract in life. Other than only gifting your loved ones with flowers on special occasions, you can make the best and lasting impressions on your loved ones with a flower plant gift. This gesture shows that you understand how flowers are important in our life. To shed light on the importance of flowers in our life, here is a blog that will give five importance of flowers
Which process is not chemical weathering?
A. Acid Rain hitting rocks
B. Cave water (with minerals) breaking down sandstone
C. Salt water flowing over rocks
D. Ice breaking a rock
Answer:
D because there's no minerals its just the ice
Explanation:
Answer:
Ice breaking a rock
Explanation:
identify the oxidising and reducing agents in these reactions, by looking at the gaming and loss of ovygen.
a) 2Mg + O2 = 2MgO
B) Fe2O3 + 3CO = 2Fe + 3CO2
Answer:
A is oxidation . B is reduction
Explanation:
A will be oxidation agent because there is gain of
electrons
B will be reducing agent because there is loss of
electrons.
PLEASE HELP ME
What happens to the energy in a reversible reaction?
Answer:
Energy changes in reversible reactions
If a reaction is exothermic in one direction, it will be endothermic in the other direction. The same amount of energy is transferred in both the forwards and reverse reaction.
is water an insulator or conducter of electricity
Answer:
Conductor
Explanation:
Electricity travels through water quickly.
what is the heat in joules required to melt 25 grams of ice?
Answer:
8,350 Joules
Hope this helps
Define color. What is color
Answer:
Color or colour is the visual perceptual property corresponding in humans to the categories called blue, green, red, etc. Color derives from the spectrum of light interacting in the eye with the spectral sensitivities of the light receptors.Explanation:
Can you help me please?
Answer:
Explanation:
d i think but im not sure
What is the mass if the weight is 410 N?Solution410/10=______kg
Answer:
41
Explanation:
w = mg
m = w/g
m = 410/10
= 41
what does a scientist need to do to prove a hypothesis is true
Answer:
Explanation:
The basic idea of a hypothesis is that there is no predetermined outcome. For a solution to be termed a scientific hypothesis, it has to be an idea that can be supported or refuted through carefully crafted experimentation or observation.
Which hypothesis of Thomson was later found to be not true by Rutherford and why?
Answer:
Explanation:
The electrons revolved around the nucleus, like the rings revolving around Saturn. In 1911, Rutherford showed that Thomson's model was "wrong": the distribution of positive and negative particles was not uniform. Rutherford showed that the atom contains a small, massive, positively charged nucleus.
The Thomson's atomic model is also called the plum pudding model. His atomic model was discarded after the discovery of Rutherford's model of atom.
What is Thomson's atomic model?According to Thomson's atomic model, an atom is considered as a uniform sphere of positive electricity with electrons embedded throughout which gives the most stable arrangement like raisins scattered in a plum pudding.
Rutherford showed that Thomson's model is wrong, because the distribution of positive and negative particles was not uniform. According to Rutherford's model most of the mass and positive charge of an atom is concentrated in a very small region called the nucleus.
The nucleus at the center of atom is surrounded by negatively charged particles which balance the positive charge on the nucleus. Thus the atom as a whole is electrically neutral.
Thus the negative charge is distributed through out the positive charge is the wrong hypothesis of Thomson's model.
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Which internal system is responsible for transporting oxygen and nutrients through an animal's body?
A: digestive system
B: circulatory system
C: respiratory system
D: central nervous system
Answer:
B: circulatory system
Explanation:
The circulatory system is made up of blood vessels that carry blood away from and towards the heart. Arteries carry blood away from the heart and veins carry blood back to the heart. The circulatory system carries oxygen, nutrients, and hormones to cells, and removes waste products, like carbon dioxide.
Answer:
Circulatory system
Explanation:
pulmonary artery plays a role of transporting oxygen from the lungs back to the heart...
And also most blood vessels transport nutrients to and from the heart
