Answer:
the relationship between the relative quantities of substances taking part in a reaction or forming a compound, typically a ratio of whole integers.
Explanation:
G o o g l e
Explanation:
Stoichiometry is the calculation of reactants and products in chemical reactions in chemistry.
What kinds of evidence might be used to conclude that you have isolated a new element?
The evidence that might be used to conclude that I have isolated a new element is the number of protons in the nucleus.
Chemical elements are different materials that have been found in nature that are characterized by having chemical characteristics different from other elements.
One way to know if I have found and isolated a new element is by showing that it does not have the same number of protons in the nucleus because this is what defines the characteristics of each element and each one has a different number of protons in the nucleus.
Therefore, the first thing I must do when I think I have found a new element is to isolate one of its atoms and check that it does not have the same number of protons in the nucleus as another element.
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Will give brainliest
Answer:
D
Explanation:
hi
good morning
I hope right answer
A block of wood has a length of 14 cm, a width of 12 cm and a height of 17 cm. What is it’s volume? If it’s density is 8.16 g cm^3 what is its mass?
Answer: volume = 2856
Mass = 6.410496 × 10-5 m3 kg
Explanation:
I need 100 ml of a 20 uM solution of a protein with a molecular weight of 50,000. How much protein do I need
I need 0.1g of protein
HOW TO CALCULATE NUMBER OF MOLES?
The number of moles of a substance in a solution can be calculated by multiplying the volume by the molarity of the solution i.e.no of moles (n) = Molarity (M) × Volume (V)
In this question, 100 ml of a 20 uM solution of a protein was given.
Since 1uM = 10^-6M
20uM = 20 × 10-⁶
= 2 × 10-⁵M
1L = 1000ml
100mL = 100/1000
= 0.1L
no of moles = 2 × 10-⁵M × 0.1L
no of moles = 2 × 10-⁶mol
HOW TO CALCULATE MASS:
Mass of a substance can be calculated by multiplying the molar mass and the number of moles i.e.Mass = moles × Molar mass
Molecular mass of protein = 50,000g/mol
Mass = 2 × 10-⁶mol × 50000g/mol
Mass = 0.1g
Therefore, 0.1gram of protein is needed
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Molarity of a solution is simply defined as the mole of solute per unit litre of water.
Mathematically, it is expressed as:
[tex]Molaity = \frac{Mole }{Volume }[/tex]
With the above information in mind, we can determine the amount of the protein needed as follow:
Step 1:Data obtained from the question
Volume = 100 mL
Molarity = 20 μM = 20×10¯⁶ M
Molecular weight of protein = 50000 g/mol
Mass of protein=?Step 2Conversion of 100 mL to litre (L).
1000 mL = 1 L
Therefore,
[tex]100 mL = \frac{100 mL * 1 L}{100 mL }\\\\100 mL = 0.1 L[/tex]
Step 3Determination of the mole of the protein
Volume = 0.1 L
Molarity = 20×10¯⁶ M
Mole of protein =?Mole = Molarity × Volume
Mole of protein = 20×10¯⁶ × 0.1
Mole of protein = 2×10¯⁶ mole Step 4Determination of the mass of the protein
Mole of protein = 2×10¯⁶ mole
Molecular weight of protein = 50000 g/mol
Mass of protein =?Mass = mole × molar mass
Mass of protein = 2×10¯⁶ × 50000
Mass of protein = 0.1 gTherefore, the amount of the protein needed is 0.1 g
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What's the electron configuration of an N-3 ion?
A) [H]
B) [Ne]
C) [He]
D) [Ar]
Answer:
C) [He]
Explanation:
Answer:
B) Ne
Explanation:
took the test
Ganciclovir is used to treat cytomegalovirus, a deadly viral infection common in immunocompromised patients. The doctor places an order for a dose of 2.5 mg/kg of body weight. What dose will the nurse administer for a 141 lb patient?
A. 160 mg
B. 56.4 mg
C. 352 mg
D. 124 mg
Answer:
A.160mgs
Explanation:
First you convert the lbs to kgs, 141lbs=63.957kgs
then you divide 63.957kgs by 2.5 which is 159.89
round up to 160, 160mgs is the correct dosage.
The dose that will the nurse administers for a 141 lb patient is 160mgs. The correct option is A.
What is a virus?
A virus is an entity that is only become alive when it gets a living host. It takes survives in its host and affects the body of the host. They are microorganisms that can not be seen by direct eyes. Viruses are harmful microorganisms. They are very deadly and they transmit through breath.
Medication, contain treatment that includes drugs and therapies to recover the patient from the disease. It is a proper process that includes timely procedures.
First, you convert the lbs to kgs, 141lbs = 63.957kgs
Then you divide 63.957 kgs by 2.5 which is 159.89 round up to 160, 160mgs is the correct dosage.
Thus, the correct option is A. 160 mg.
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Propose routes to the following compounds from propyl bromide and any necessary organic or inorganic reagents:
a. propyllithium
b. propylmagnesium bromide
c. propylzinc bromide
d. Dipropylzinc
Which of the following salts are more soluble in acidic solution than in pure water?
(A) Al(OH)3,
(B) BaF2,
(C) PbCl2,
(D) Hg2Br2,
(E) NiS,
(F) AgI
The salts which are more soluble in acidic solution than in pure water are Al(OH)₃, BaF₂, PbCl₂ and Hg₂Br₂.
Which compounds will easily dissolve in acids?Those compounds which are basic in nature will easily dissolve in the acidic solution as compare to the pure water.
Al(OH)₃ is basic in nature due to the presence of hydroxide ions in it, so it gets easily soluble in the acidic solution.BaF₂ is also basic in nature as it is a salt of strong base, so it gets easily soluble in the acidic solution.PbCl₂ is moderate basic in nature as it is a salt of weak base and strong acid, so it is not easily soluble in the acidic solution.Hg₂Br₂ is also slightly basic in nature as it is a salt of weak base and strong acid, so it is not easily soluble in the acidic solution.NiS is not soluble in acidic solution because it shows acidic behavior as it a salt of very weak base.AgI is also not soluble in acidic solution because it shows acidic behavior as it a salt of strong acid.Hence Al(OH)₃, BaF₂, PbCl₂ and Hg₂Br₂ will soluble in acidic solution.
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Why does the temperature stop rising while ice melts into water?
A. Because no more heat is being added to the system.
B. The temperature does not stop rising.
C. The electrons are increasing in energy levels.
D. The energy is being absorbed to separate the particles
45. Show that the acceleration of a hamster is 5 m/s2 when it
increases its velocity from rest to 10 m/s in 2 s.
The acceleration of the hamster is 5 m/s².
Acceleration is the rate of change of velocity per unit of time.
Given:
Initial velocity (v₀): 0 m/s (rest)Final velocity (v): 10 m/sTime elapsed (t): 2 sWe can calculate the acceleration of the hamster using the following expression:
[tex]a = \frac{v-v_0}{t} =\frac{10m/s-0m/s}{2s} = 5 m/s^{2}[/tex]
The acceleration of the hamster is 5 m/s².
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I can distunguish between elements, compounds and mixtures.
3.1 I can describe what elements anre and give examples of them.
3.2 I can describe what mixtures are and give examples of them.
3.3 I can describe what compounds are and give examples of them.
0 0
This picture represents..
O a compound
O an element
O a mixture of elements
O a mixture of compounds
Answer:
an element
Explanation:
that is the answer yep
it represent an element
Draw the keto and enol forms of 3,3-dimethylbutan-2-one, circle the more stable tautomer, and propose a mechanism for the conversion of one tautomer to the other in acidic conditions.
Bio-Clemical reactions talking Place in every Cell organelles
Answer:
Each of these organelles performs a specific function critical to the cell's survival. For example, biochemical reactions in a cell's mitochondria transfer energy from fatty acids and pyruvate molecules into an energy-rich molecule called adenosine triphosphate (ATP).
Explanation:
Name
maddison, M
Date
Vocabulary
Write the word next to the description it matches.
mixture
solubility
solution
1.
2.
the degree to which a material will dissolve in another
substance
different materials placed together but keeping their own
properties
a mixture in which substances are spread out evenly and
will not settle
3.
Okay
Answer:
solubility- the degree to which a material will dissolve in another substance
mixture- different materials placed together but keeping their own properties
solution- a mixture in which substances are spread out evenly and will not settle
solve for x . 4x-300=-8×
Answer:
4x+8x=30
12x=300
x=300/12
x=25
Class 8 chemistry : metals and non metals describe the process of formation of coal in the nature
Explanation:
Coal is formed when dead plantand animals matter decays into peat and is converted into coal by the heat and pressure of deep burial over millions of years.
What was the variable that Sunil changed in his experiment?
Explanation:
The things that are changing in an experiment called variables. A variables is any factor , trail , or condition that can exist in differing amounts or types. The independent variables is the one that is changed by the scientist. Why just one? well, if you changed more than one variables it would be hard to fight out which be hard to fight out which change is causing what you observe . For example, what if our scientists question was:" how does the size of a dag affect how much ismts eats?" then, during your feeding experiment you changed both the size of the dog and the time of day the dags were fed.
a test tube containing liquid x is placed in a beamer of boiling water. the liquid starts to boil immediately. what is the boiling point of liquid x?
a) 100 celsius
b) above 100
c) between 0 and room temperature
d) between room temperature and 100 celsius
Answer:
100 Celsius
Explanation:
(I'm not sure if this is right but I'm confident this is the answer)
Am element has 18 electrons ,20 neutrons and a charge of -2.what is the mass number?..a.38 b.40 c.32 d.39
Answer:
Surely you must have a Periodic Table beside you....?
a=38
Explanation:
You gots Z=18, the atomic number, where Z is the number of nuclear protons. The number of protons defines the element....and thus we got calcium....
....and with 20 neutrons we got the 38Ca isotope....the which is rather short-lived...
What is the safe way to dispose of an acidic solution
I'd say by Neutralization so as to make it Harmless.
Or
You Over dilute it with Water
Note: You pour the acid into water...Not water into acid as it may spill and burn your skin.
Answer: D
Explanation:
HELP PLEASE WILL MARK BRAINLIEST!!!!!!!
Answer:
Precise
Explanation:
hope it helps!!!!!!!!
1.List three (3) importance of photosynthesis to our ecosystem. a) b) c)
Answer:
It is the number one source of oxygen in the atmosphere. It contributes to the carbon cycle between the earth, the oceans, plants and animals. It contributes to the symbiotic relationship between plants, humans and animals. It directly or indirectly affects most life on Earth
Answer:
three importance are
it helps in fixing and balancing the amount of carbon dioxide and oxygen in the atmosphere
it provides the nutrition to the plant
it helps the. plant in its growth
What kinds of questions cannot be answered by chemistry
4. In KCl, how are the valence electrons distributed?
O A. The electrons are shared between many K and Cl ions, creating a "sea of electrons."
B. The electrons are transferred from K to CI.
O c. The electrons are equally shared between K and Cl, forming a covalent bond.
D. The electrons are unequally shared between K and Cl, forming a polar covalent bond.
Answer:
Since KCl is an ionic compound, there is transfer of electrons from K to Cl. Thus right answer should be (B)
KCl is a chemical called potassium chloride that has been known to be an ionic compound. The valence electrons ion KCl gets transferred from K to Cl ion. Thus, option B is correct.
What is an ionic bond?An ionic bond is said to be a type of chemical bond that involves the gain and loss of the electron in the valence shell of the atom species. It involves the bond formation between the ions.
The ions with opposite charges, carrying a positive and negative are said to bond by accepting and donating their electrons to achieve the noble-gas (electronic) configuration.
In KCl, potassium has more electrons and can donate it to chlorine species as the latter lacks electrons. Chlorine accepts electrons and in the process acquires a negative charge, whereas potassium gains a positive charge.
Therefore, option B. the KCl involves ionic bonds by transferring electrons.
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Carbohydrates make up 75% of the mass of dried plant material. Cotton is at least 95% carbohydrate. Why do humans not include cotton in their diet?
Answer:
the carbohydrates in cotton are mainly cellulose, but our body does not possess the proper enzymes to process cellulose, no we don't eat cotton on in our daily diet.
Carbon dioxide gas is obtained from the fermentation of glucose. If 20.0 L of carbon
dioxide (at s.t.p) are collected, calculate the number of oxygen atoms present in this gas.
Answer:
5.48 x 10´23 atoms
Explanation:
Use PV = nRT
V = 20 L
R= constant = 0,08205746 L atm / (K mol)
stp means stantdard temperature and pression
T = 273 K
P = 0.987 atm
n = PV/RT = (0.987 atm) x (20 L) = 0.88 moles
(0,082 Latm/(K mol)x 273 K
0.88 moles x [tex]6.22 x 10^{23}[/tex] molecules = 5.48 x 10´23 atoms
How mant grams are there in 7.15 x 10^24 molecules of water?
A)11.88g
B)214.02g
C)0.66g
D) 1.29 x 10^26g
E)3.97 x 10^23 g
Answer:
B. 214.02
Explanation:
1 mol of water weighs 18.015 gm and contains 6.023 × 10²³ molecules
From question, We have 7.15 × 10²⁴ molecules
Dividing we get (7.15 × 10 ²⁴) ÷ ( 6.023 × 10²³) = 11.871 molecules
Now, Weight of water = 11.871 × 18.015 = 213.85 which is nearer to option B
Answer:
[tex]\boxed {\boxed {\sf B. \ 214 \ g }}[/tex]
Explanation:
We are asked to find the mass of a given number of water (H₂O) molecules.
1. Convert Molecules to MolesFirst, we convert molecules to moles. We will use Avogadro's Number or 6.022 × 10²³. This is the number of particles (atoms, molecules, formula units, etc.) in 1 mole of a substance. In this case, the particles are molecules of water. Therefore, there are 6.022 ×10²³ molecules of water in 1 mole of water.
We will convert using dimensional analysis, so we must set up a ratio using the underlined information.
[tex]\frac {6.022 \times 10^{23} \ molecules \ H_2O}{1 \ mol \ H_2O}[/tex]
We are converting 7.15 × 10²⁴ molecules of water to moles, so we multiply the ratio by that value.
[tex]7.15 \times 10^{24} \ molecules \ H_2O*\frac {6.022 \times 10^{23} \ molecules \ H_2O}{1 \ mol \ H_2O}[/tex]
Flip the ratio so the units of molecules of water cancel each other out.
[tex]7.15 \times 10^{24} \ molecules \ H_2O*\frac {1 \ mol \ H_2O} {6.022 \times 10^{23} \ molecules \ H_2O}[/tex]
[tex]7.15 \times 10^{24} *\frac {1 \ mol \ H_2O} {6.022 \times 10^{23} }[/tex]
[tex]\frac {7.15 \times 10^{24}} {6.022 \times 10^{23} } \ mol \ H_2O[/tex]
[tex]11.87313185\ mol \ H_2O[/tex]
2. Convert Moles to GramsNext, we convert moles to grams. We will use the molar mass. This is the mass of 1 mole of a substance. These values are found on the Periodic Table. They are equivalent to the atomic masses, but the units are grams per mole instead of atomic mass units.
Look up the molar masses of the individual elements in water: hydrogen and oxygen.
H: 1.008 g/mol O: 15.999 g/molThere is a subscript of 2 after H, so there 2 moles of hydrogen in 1 mole of water. Multiply the molar mass by 2 before adding oxygen's molar mass.
H₂: 1.008 * 2 = 2.016 g/mol H₂O: 2.016 + 15.999 = 18.015 g/molWe convert using dimensional analysis again and set up another ratio.
[tex]\frac {18.015 \ g \ H_2O}{ 1 \ mol \ H_2O}[/tex]
Multiply by the number of moles we just calculated.
[tex]11.87313185 \ mol \ H_2O *\frac {18.015 \ g \ H_2O}{ 1 \ mol \ H_2O}[/tex]
The units of moles of water cancel.
[tex]11.87313185 *\frac {18.015 \ g \ H_2O}{ 1 }[/tex]
[tex]213.8944703 \ g \ H_2O[/tex]
The original measurement of molecules has 3 significant figures, so our answer must have the same. For the number we found, that is the one place. The 8 in the tenths place tells us to round the 3 up to a 4.
[tex]214 \ g \ H_2O[/tex]
There are approximately 214 grams of water and choice B is correct.
The specific gravity of a vegetable oil is 0.92. What is the massgrams, of 330 mL of vegetable oil?
Answer:
HOPE THIS ANSWER WILL HELP YOU
a 2.00 mL sample of a substance A has a density of 18.4g/mL and a 5.00 mL sample of substance B has a density of 35.5g/mL. do you have an equal mass of substances A and b?
this question made my brain hurt. please explain :(
Answer:
no
Explanation:
make use of this formula to find the mass of each sample.
m=density*volume
Please help thank you (15 points)
Answer:
Jupiter.
Explanation:
Jupiter has the fastest axial rotation time (day) in the list of answers, based on the fact that its day is only 10 hours long.