Answer:yes
Explanation:it doesnt know
How many milliliters of sterile water for injection should be added to a vial containing 5 mg/mL of a drug to prepare a solution containing 1.5 mg/mL of the drug
Answer:
7mL of sterile water is the initial amount of the concentrated solution is 3mL
Explanation:
In this problem, the vial must be diluted from 5mg/mL to 1.5mg/mL, that means the solution must be diluted:
5mg/mL / 1.5mg/mL = 3.33 times
If the initial amount of the drug in the vial is 3mL, the final volume must be:
10mL
That means the volume of water that should be added is:
10mL - 3mL:
7mL of sterile water is the initial amount of the concentrated solution is 3mLWhat is a spontaneous change?
A. One that occurs when one specific event happens.
B. One that occurs on its own.
C. One that has a random arrangement of particles.
D. One that has an ordered arrangement of particles.
Answer:B. One that occurs on its own
Explanation:
Why are lubricants necessary?
decrease loss of energy
reduce friction
used as fuel
increase heat energy
Answer:
reduce friction
Explanation:
Lubricants are needed to reduce the friction between two bodies in contact with one another.
Frictional force is a force that opposes the motion of a body. As a body moves forward, friction acts in an opposite direction.
Lubricants are used to reduce and remove frictionUnfortunately, without friction, motion cannot be controlled.Lubricants only reduces friction between two bodies. As friction reduces, a body moves more readily and easily.What is The Magnus Effect/Force? Explain.
Answer:
dk
Explanation:
A drug is commercially available in capsules each containing 12.5 mg of drug and 37.5 mg of diluent. How many milligrams of additional diluent must be added to the contents of one capsule to make a dilution containing 0.5 mg of drug in each 100 mg of powder
Answer:
2450 mg
Explanation:
From the given information:
The total weight of the capsule = 12.5 mg + 37.5 mg
= 50 mg
The percentage of drug in each capsule = [tex]\dfrac{12.5}{50} \times 100[/tex]
= 25%
= 0.25
To make 0.5 mg of drug in each 100 mg of powder after dilution;
Then, the drug percent in each capsule after dilution is:
[tex]=\dfrac{0.5}{100}\times 100[/tex]
= 0.5%
= 0.005
Suppose (p) mg represent the amount that is added to the diluent in the given capsule. Then;
The total amount is = (50 + p) mg
Since the amount of the drug = 12.5 mg
Then the concentration [tex]=\dfrac{12.5}{50 + x}[/tex] which needs to be equal to the needed concentration that is diluted.
i.e.
[tex]\dfrac{12.5}{50 + x} = 0.005[/tex]
By cross multiply;
(50 + x) 0.005 = 12.5
(50 × 0.005) + (0.005x) = 12.5
0.25 + 0.005x = 12.5
0.005x = 12.5 - 0.25
0.005x = 12.25
x = 12.25 / 0.005
x = 2450 mg
Thus, there is a need for an additional 2450 mg to make a dilution that compass 0.5 mg of drug in 100 mg powder.
Which is the electron configuration of an atom in the ground state?
Identify a reason that chemical reaction releases enegry during the reaction process
Answer:
The movement of molecules
Answer:
All chemical reactions involve energy. Energy is used to break bonds in reactants, and energy is released when new bonds form in products. Like the combustion reaction in a furnace, some chemical reactions require less energy to break bonds in reactants than is released when bonds form in products
Explanation:
can u pls help me with this question
Answer:
rare username has joined the meeting.
Explanation:
PLEASE ANSWER ASAP!!! I WILL GIVE FREE PIONTS AND BRAINLIEST IF YOU ARE CORRECT! PLEASE ANSWER ITS DUE TODAY!!!
Answer:
Explanation:
This image is a good example of the law of conservation of mass because it shows that mass is not created or destroyed. We can see this in the picture because there's 4 hydrgen and 2 oxygen atoms in the reactants (the left side of the arrow) and there's 2 oxygen atoms and 4 hydrogen atoms in the products (right side of the arrow). Since there's the same amount of atoms on both sides, then law of conservation of mass applies.
Stealing your points like how you stole mine! +*♡
Don't answer someone's question with some nonsense and then delete it; especially when I spent over an hour on that one question. I will surely delete my answers after this and still have my 15 points...
don't reap what you sow :)
You can search that up if you don't even know what that means.
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Hope this helped.
To determine the mass in grams of any element, you would
a-divide the mass of a mole of the element by molar mass
b-subtract the mass of a mole of the element from Avogadro’s number
c-add the mass of a mole of the element to Avogadro’s number
d-multiply the mass of a mole by its molar mass
Answer:
d-multiply the mass of a mole by its molar mass
Explanation:
Mass of an element, Z, which is measured in grams is related to the number of moles contained in that element and its molar mass, which can be expressed using the formula:
number of moles (n) = mass ÷ molar mass
This means that the mass (in grams) can be calculated by multiplying the number of moles in the element by its molar/atomic mass. That is;
Mass (g) = number of moles (n) × molar mass (MM)
How many moles of aluminum are equivalent to 4.816 x 1024 atoms?
Answer:
8 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{4.816 \times {10}^{24} }{6.02 \times {10}^{23} } = 8 \\ [/tex]
We have the final answer as
8 molesHope this helps you
Answer:
Explanation:
there are 8 moles.
Choose the INCORRECT statement.
1) A molecule is a group of bonded atoms that exist as an entity.
ü) Ionic compounds result from combinations of metals and nonmetals.
iii) An anion is a positive ion.
iv) The empirical formula is the simplest formula of the ratio of atoms.
V) The molecular formula is the listing of the atoms in an actual molecule.
Answer:
iii) An anion is a positive ion.
cuz an anion is negatively charged ion
The INCORRECT statement is "An anion is a positive ion".
So, the correct option is iii.
How an anion formed?An atom can lose and gain one or more electrons from outermost shell which is known valence shell and formed an ions.
An atom gain one or more electrons and form negative charged species called an anion.
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2. How many grams of Mercury are in 9 moles of Mercury?
Answer:
hope you like my answer
Explanation:
this is the answer
This is the chemical formula for nickel tetracarbonyl (a powerfully poisonous liquid used in nickel refining): A chemical engineer has determined by measurements that there are moles of nickel in a sample of nickel tetracarbonyl. How many moles of oxygen are in the sample
Answer:
38 moles of oxygen
Explanation:
This is the chemical formula for nickel tetracarbonyl (a powerfully poisonous liquid used in nickel refining): Ni(CO)₄. A chemical engineer has determined by measurements that there are 9.6 moles of nickel in a sample of nickel tetracarbonyl. How many moles of oxygen are in the sample?
Step 1: Given data
Chemical formula of nickel tetracarbonyl: Ni(CO)₄
Moles of nickel: 9.6 moles
Step 2: Establish the molar ratio of nickel to oxygen
According to the chemical formula, the molar ratio of nickel to oxygen is 1:4.
Step 3: Calculate the moles of oxygen that accompany 9.6 moles of nickel.
We will use the previously established molar ratio.
9.6 mol Ni × (4 mol O/1 mol Ni) = 38 mol O
A stack of 15 pennies is immersed into a 100 mL graduate initially containing 20.6 mL of water. The volume in the graduate cylinder increases to 26.0 after the pennies are added. Calculate the volume in mL of the stack of 15 pennies
Answer: 5.4
Explanation: The Law of Impenetrability says that two objects can't occupy the same space at the same time; therefore, the pennies and the water can't occupy the same space at the same time. Without the pennies the water level read 20.6 mL, dropping in the pennies gives a level of 26.0.
A liquid, solid, or gas's volume is the amount of three-dimensional space it occupies. Volume in mL of the stack of 15 pennies is 26.0 mL.
What is volume?A liquid, solid, or gas's volume is the amount of three-dimensional space it occupies. Although there are many different units that may be used to indicate volume, the most common ones are litres, m³, gallons, milliliters, teaspoon, as well as ounces.
Due to the Law of Impenetrability, which states that two items cannot occupy the same place at the same time, neither can pennies nor water. When the pennies are added, the water level rises to 26.0 mL from 20.6 mL before.
Mass is the quantity of matter a material contains, whereas volume is indeed the space that it occupies. The density of a sample is the quantity of mass in a given volume.
Therefore, volume in mL of the stack of 15 pennies is 26.0 mL.
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Explain two ways that photosynthesis helps a predator like a wolf or
tiger.
Answer: Photosynthetic organisms take light energy and use it to make their own "food". In this process they use carbon dioxide and light to make sugars and oxygen. This is great for other animals that utilize this oxygen and eat the plants for food.
HOPE THIS HELPS
Photosynthesis is the source of energy in the ecosystem. Without this energy source, there will be no food available to predators such as wolf or
tiger.
In the ecosystem, energy is transferred along the food chain. The food chain shows the feeding relationships among living organisms in the ecosystem.
The green plants are the primary producers. They are able to trap energy directly from the sun and make their own food through the process of photosynthesis.
It is this energy from the food that they make through photosynthesis that is passed along the food chain as herbivores eat green plants and are in turn eaten by the predators.
Also, green plants produce oxygen during photosynthesis which is taken in by animals such as wolf or tiger and is used in the breakdown of complex food materials.
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what is the frequency,in Hz,of electromagnetic radiation that has a wavelength of 1.25m
Answer:
[tex]f=2x10^8Hz[/tex]
Explanation:
Hello!
In this case, given that frequency of the electromagnetic radiation showing off a wavelength of 1.25 m is computed by using the speed of light as shown below:
[tex]f=\frac{c}{\lambda }[/tex]
We plug in the wavelength and speed of light to obtain:
[tex]f=\frac{3x10^8m/s}{1.25m } \\\\f=2x10^8Hz[/tex]
Best regards!
The frequency will be "[tex]2\times 10^8 \ Hz[/tex]".
Electromagnetic radiation:Radiation which thus travels throughout waves as well as which has both electromagnetic energy.
The power of electromagnetic radiation could range from minimum to maximum. Radio waves, radiation, x-rays, and gamma radiation are all examples of electromagnetic radiation.
Given value:
Wavelength, [tex]\lambda = 1.25 \ m[/tex]
Speed of light, [tex]c = 3\times 10^8[/tex] m/s
The frequency be:
→ [tex]f = \frac{c}{v}[/tex]
By putting the values,
[tex]= \frac{3\times 10^8}{1.25}[/tex]
[tex]= 2\times 10^8[/tex] Hz
Thus the above response is right.
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QUICK!! Which of the following statements is true? A. Both liquids and gases are fluids. B. Objects moving through air don't experience friction. C. Temperature is the same as heat. D. Heat is transferred in solids by convection.
Answer:
its A!! i just got finished my assignment and went straight on here because the other person didn't answer right. Trust me,its right!! good luck people<3
Explanation:
Answer:
Both liquids and gases are fluids
Explanation:
fluids are substances that flow, and gases also flow.
Which of the following best describes the relationship between earthquakes and tsunamis?
A
An underwater earthquake can cause a tsunami.
B
Both are the result of big volcanic explosions.
C
Tsunami waves are the main cause of earthquakes.
D
Earthquakes prevent tsunamis from occurring.
Answer:
Tsunamis are usually triggered by earthquakes, volcanic eruptions and underwater explosions, landslides and other mass movements. Underseas earthquakes have generated nearly all the major tsunamis in history. Tsunamis can be generated when the sea floor abruptly deforms and vertically displaces the overlying water.
Explanation:
Answer A is correct because of the fact that tsunamis can be caused by underwater explosions
The best description that shows the relationship between earthquake and tsunami is an underwater earthquake can cause a tsunami.
The correct option is (A).
What causes tsunami?Tsunamis are waves that form when the ocean surface moves suddenly due to earthquakes.
Some other causes of tsunami are landslides on the sea floor land collapsing into the water, massive volcanic eruptions, or a meteorite strike in the ocean.
What causes earthquake?The displacement or collision of tectonic plates of earth lithosphere causes earthquake.
The earthquake in the sea or ocean surface leads to tsunami.
Thus, option (A) An underwater earthquake can cause a tsunami is the correct option.
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Nitrogen can exist as a solid, a liquid, or a gas. Which of the following lists the
phases of nitrogen in order of increasing density?
1. liquid, gas, solid
2. gas, liquid, solid
3. gas, solid, liquid
4. solid, liquid, gas
The phases of nitrogen in order of increasing density is solid, liquid, and gas.
Nitrogen is known to be odorless and colorless. Nitrogen makes up about 78% of the gases that we've in the atmosphere. It has an atomic number of 7 and is represented with the symbol N.It should be noted that nitrogen can be a solid, a liquid or a gas. When nitrogen is at ordinary pressure, it is known to be a gas. In a case whereby nitrogen is below 77°K, then it's a liquid and it's a solid when it's below 63°K.The density explains the mass per unit volume that nitrogen has when it's either at gaseous, solid or liquid state. It should be noted that the highest density is at its gaseous state.Therefore, the phases of nitrogen in order of increasing density will then be solid, liquid, and gas.In conclusion, the correct option is D.
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A chemist adds 215.0mL of a 6.0x10^−5/mmolL mercury(II) iodide HgI2 solution to a reaction flask. Calculate the micromoles of mercury(II) iodide the chemist has added to the flask. Round your answer to 2 significant digits.
The micromoles of mercury(II) iodide : 0.013 μ moles
Further explanationGiven
215.0mL of a 6.0x10⁻⁵mmol/L HgI₂
Required
micromoles of HgI₂
Solution
Molarity(M) = moles of solute per liters of solution
Can be formulated :
M = n : V
n = moles
V = volume of solution
V = 215 mL = 0.215 L
so moles of solution :
n = M x V
n = 6.10 mmol/L x 0.215 L
n = 1.312 . 10⁻⁵ mmol
mmol = 10³ micromol
so 1.312 mmol = 1.312.10⁻⁵ x 10³ = 0.01312 micromoles ⇒ 2 sif fig = 0.013 μ moles
How many grams of magnesium
sulfate (MgSO4) are dissolved in
0.965 L of a 0.0575 M solution?
6.68 g MgSO₄
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Aqueous Solutions
Molarity = moles of solute / liters of solutionAtomic Structure
Reading a Periodic TableUsing Dimensional AnalysisExplanation:Step 1: Define
0.965 L
0.0575 M
Step 2: Identify Conversions
Molar Mass of Mg - 24.31 g/mol
Molar Mass of S - 32.07 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of MgSO₄ - 24.31 + 32.07 + 4(16.00) = 120.38 g/mol
Step 3: Find MgSO₄
Substitute [M]: 0.0575 M = x / 0.965 LIsolate x: 0.055488 mol MgSO₄ = xRewrite: x = 0.055488 mol MgSO₄Step 4: Convert
[tex]\displaystyle 0.055488 \ mol \ MgSO_4(\frac{120.38 \ g \ MgSO_4}{1 \ mol \ MgSO_4} )[/tex] = 6.67959 g MgSO₄
Step 5: Check
We are given 3 sig figs as our lowest. Follow sig fig rules and round.
6.67959 g MgSO₄ ≈ 6.68 g MgSO₄
Please help me thank you, I will mark you?!?!?.:;)))
Answer:
a change from a solid to a liquid
Explanation:
Answer:
Dissolving salt in water is a chemical change.
Explanation:
A log burning is a chemical reaction, but not change. All the others are obviously not the answer.
Calculate the molar mass of adrenaline (C9H13NO3C9H13NO3), a hormone responsible for regulating heart rate and other functions of the sympathetic nervous system. Express your answer to five significant figures.
Answer:
[tex]M_{C_9H_{13}NO_3}=183.23g/mol[/tex]
Explanation:
Hello!
In this case, since the molar mass of a chemical compound is computed by averaging the atomic mass of each element in the molecule and the amount of atoms; which in this case there are 9 carbon atoms, 13 hydrogen atoms, 1 nitrogen atom and 3 oxygen atoms; thus, we compute the average as shown below:
[tex]M_{C_9H_{13}NO_3}=m_C*9+m_H*13+m_N+m_O*3[/tex]
Now, we plug in the atomic masses to obtain:
[tex]M_{C_9H_{13}NO_3}=12.01*9+1.01*13+14.01+16.00*3\\\\M_{C_9H_{13}NO_3}=183.23g/mol[/tex]
Best regards!
A sentence with the word atom
Answer:
we use atom in our sentences all the time
Explanation:
that what i put
A 1.00-L flask was filled with 2.00 moles of gaseous and 2.00 moles of gaseous and heated. After equilibrium was reached, it was found that 1.21 moles of gaseous was present. Assume that the reaction
SO2 + NO2 ⇌ SO3 + NO
occurs under these conditions. Calculate the value of the equilibrium constant, K, for this reaction.
Answer:
2.35
Explanation:
A 1.00-L flask was filled with 2.00 moles of gaseous SO₂ and 2.00 moles of gaseous NO₂ and heated. After equilibrium was reached, it was found that 1.21 moles of gaseous NO was present. Assume that the reaction
SO₂ + NO₂ ⇌ SO₃ + NO
occurs under these conditions. Calculate the value of the equilibrium constant, K, for this reaction.
Step 1: Calculate the molar concentrations
Since the reaction takes place in a 1.00 L flask, the molar concentrations are:
[SO₂]i = 2.00 M
[NO₂]i = 2.00 M
[NO]eq = 1.21 M
Step 2: Make an ICE chart
SO₂ + NO₂ ⇌ SO₃ + NO
I 2.00 2.00 0 0
C -x -x +x +x
E 2.00-x 2.00-x x x
Step 3: Calculate the concentrations at equilibrium
The concentration of NO at equilibrium is 1.21 M. Then, x = 1.21.
[SO₂]eq = 2.00-1.21 = 0.79 M
[NO₂]eq = 2.00-1.21 = 0.79 M
[SO₃]eq = x = 1.21 M
[NO]eq = x = 1.21 M
Step 4: Calculate the value of the equilibrium constant, K, for this reaction
K = [SO₃] × [NO]/[SO₂] × [NO₂]
K = 1.21²/0.79² = 2.35
What is the correct IUPAC name for S2F8?
Answer:
Question: What Is The Correct IUPAC Name For S2F8? X ( ( (I) (IV) Di- Mono- Penta- Tetra- Tri- Hepta- Octa- Hexa- Fluorine Selenide Flourate Sulfide Sodium Sulfate Sulfur Fluoride Hydrate Acid.
how does an objects mass affect its kinetic energy?
The atomic number of nitrogen is 7. The number of electrons a neutral nitrogen atom has is
, and its atomic mass is approximately
amu.
Answer:
The number of electron in neutral atom of nitrogen are 7.
Atomic mass = 14 amu
Explanation:
An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.
All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example if neutral atom has 6 protons than it must have 6 electrons. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.
The number of electron in neutral atom of nitrogen are 7.
Thus its atomic number is also 7.
Atomic mass = number of proton + number of neutron
Atomic mass = 7 + 7
Atomic mass = 14 amu
5. What does the symbol in the picture represent? *
A.Battery
B.Resistor
C.Wire
D.Bulb
