Answer:
62.9%
Explanation:
Step 1: Given data
Mass of hydrate sodium carbonate (mNa₂CO₃.xH₂O): 71.5 gMass of anhydrous sodium carbonate (mNa₂CO₃): 26.5 gStep 2: Calculate the mass lost of water
We will use the following expression.
mH₂O = mNa₂CO₃.xH₂O - mNa₂CO₃
mH₂O = 71.5 g - 26.5 g = 45.0 g
Step 3: Calculate the percent of water in the hydrate sodium carbonate
We will use the following expression.
%H₂O = mH₂O / mNa₂CO₃.xH₂O × 100%
%H₂O = 45.0 g / 71.5 g × 100%
%H₂O = 62.9%
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A block with a volume of 20 cm3 has a density of 5 g/cm3. The block is cut into two pieces. One piece has a volume of 15 cm3, and the other piece has a volume of 5 cm3. What are the densities of the two pieces?
Answer:
wouldnt they still have the same density?
Explanation:
for example, the density of iron is 7.874 g/cm^3 no matter how big the piece is. I hope this helps.
Give the IUPAC name for each compound.
Answer:
a. 1-fluoro-3,3,4-trimethyl-pentane.
b. 1-iodo-3-ethyl-2-methyl-hexane.
c. 1,3-dichloro-5-dimethyl-hexane.
d. 1-bromo-3-methyl-cyclopentane.
Explanation:
Hello!
In this case, according to the IUPAC rules for the listed alkyl halides, we first need to name the halogens (considering periodic order) then alkyl radicals and finally the parent chain; thus, the names are given below:
a. 1-fluoro-3,3,4-trimethyl-pentane.
b. 1-iodo-3-ethyl-2-methyl-hexane.
c. 1,3-dichloro-5-dimethyl-hexane.
d. 1-bromo-3-methyl-cyclopentane.
e. 5-chloro-1-bromo-1,1,5-trimethyl-pentane (radicals are not clear).
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What is the systematic name of the following compound?
Li2S
Answer:
the systematic name is called Lithium sulfide.
An inorganic substance composed of the elements lithium (Li) and sulfur (S) is known as lithium sulfide [tex](Li_2S)[/tex].
It is a substance that solidifies in the shape of a crystal. Lithium ions in lithium sulfide have a positive charge, while sulfide ions have a negative charge. The chemical lithium sulfide is important in many industries. It is often employed in the synthesis of various lithium compounds, the manufacture of lithium batteries, and the manufacture of ceramics. Due to their high energy density, lithium batteries are often employed in portable electronics and electric vehicles.
Lithium sulfide is an ionic compound that has a high melting point in terms of physical characteristics. Although it is insoluble in water, many organic solvents can help dissolve it.
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Determine the molar mass of Cao
Answer:
Molar mass of CaO
(40 + 16)g
= 56g
hope it helps you
Why is there no sound in outer space? PLEASE HELP IF YOU WANT BRAINLEIST AND A LIKE ON URE COMMENT!
A. The speed of sound is too slow for space.
B. There is no medium in which it can travel.
C. There are too many other noises.
D. There is only echolocation in space.
Answer:
B
Explanation:
How are molecules built?
All of these
Phase Changes
Atomic Rays
Bonding
1
Answer:
By bonding due to the attractive forces
(1) Phosphorus silicon is a semi-conductor
When Silicone is altered with Phosphorus, 4 of its electrons form covalent bonding and the 5th electron becomes delocalized and thus it increases electrical conduction
Answer:
blue blah blue blah
Explanation:
If one force on an object is 5 N upward and the other is 10 N downward what is the objects motion?
To solve this we must be knowing each and every concept related to force. Therefore, the objects motion will be towards downward with a force of 5 N.
What is force?A force is an outside entity that has the power to alter a body's state of rest or motion. It has a direction and a magnitude. The point where forces are applied is determined by the the force's direction as well as the application of the force.
Newton and dyne units are used to measure the force exerted on an item. When using the centimeter kilogram second system of units, force is measured in dynes (CGS unit). In the common international system of units, it is denoted by the letter Newton (N) (SI unit).
upward force=5 N
downward force= 10 N
total force acting on body=downward force-upward force
= 10 N - 5 N
=5 N downward force
The objects motion will be towards downward with a force of 5 N.
Therefore, the objects motion will be towards downward with a force of 5 N.
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I need a answer ASAP
Answer:
3.2 millions years oldExplanation:
i hope it helps :)
1.7 x 10 cm= significant figures
Answer:
its 2
Explanation:
How many atoms are in .938 moles of CO2?
Answer: 1.695x10^24 atoms
Explanation: 0.938 moles CO2 = 0.938xavogadro number molecules CO2, so number of atoms = 3x0.938x6.02214076x10^23 = 1.695x10^24
(1132 CHCH2CH = CH2
12. Give the complete IUPAC name for each of the following compounds:
(a) (CH3)2CHF
(b) CH3CHCICHCICH3
(C)
CH3CHCH;
CH2CH3
(d) CH3 CH2 CH = CHCHZ
(e)
CH3CH2CH2CHBCH2CH3
CH2CH=CH2
Answer:
Ok:
Explanation:
a) 2-fluoropropane
b) 2,3 dichlorobutane
c) pent-2-ene or 2 pentene (I assume the semicolon was a typo)
d) Same as c (I assume Z is a typo too)
e) non-1-ene or 1-nonene (I assume the B is a 2)
What carpet Burns in a deficiency of O2 a mixture of CO and CO2 forms.Carbon Burns in excess O2 to form only CO2 and CO Burns in excess O2 to form only CO2. Calculate ΔH for C(graphite +1/2O2) →CO(g).
Answer:
Explanation:
From the combustion of carbon, the reactions occurring in limited oxygen conditions are:
[tex]C(graphite) + \dfrac{1}{2}O_{2(g)} \to CO_{(g)}[/tex]
[tex]C(graphite) + O_{2(g)} \to CO_{2(g)}[/tex]
If it occurs in excess, then any leftover CO changes to CO2. i.e.
[tex]C(graphite) + O_{2(g)} \to CO_{2(g)}[/tex] ---- (1)
[tex]CO_{(g)} + \dfrac{1}{2}O_{(g)} \to CO_{2(g)}[/tex] ----- (2)
From (1), the enthalpy change is:
[tex]\Delta H_{rxn1} = \Delta H^0_{fCO_2(g)} - ( \Delta H^0_{f C(graphite)}+ \Delta H^0_{fCO_2(g)}[/tex]
[tex]\Delta H_{rxn1} =-393.5 \ kJ/mol -(0+0)[/tex]
[tex]\Delta H_{rxn1} =-393.5 \ kJ/mol[/tex]
From (2), the enthalpy change is:
[tex]\Delta_{rxn2} = \Delta H^0_{fCO_2(g)} - ( \Delta H^0_{fCO(g)} + \dfrac{1}{2} \Delta H^0_{fO_2(g)})[/tex]
[tex]\Delta_{rxn2} = -393.5 \ kJ/mol -(-110.5 + \dfrac{1}{2}(0))[/tex]
[tex]\Delta_{rxn2} = -283.0 \ kJ/mol[/tex]
Subtracting (2) from (1), we get:
[tex]C(graphite) + O_{2(g)} \to CO_{2(g)} \ \ \ \Delta H_{rxn} = -393.5 \ kJ/mol}[/tex]
[tex]CO_{(g)} + \dfrac{1}{2} O_2(g) \to CO_{2(g)}} \ \ \ \Delta H _{rxn2} = -283.0 \ kJ/mol[/tex]
[tex]C(graphite) + O_{2(g)} \to CO (g) + \dfrac{1}{2}O_{2(g)} \ \ \ \Delta H_{rxn} = -110.5 \ kJ/mol[/tex]
[tex]C(graphite) + \dfrac{1}{2} O_{2(g)} \to CO (g) \ \ \ \Delta H_{rxn} = -110.5 \ kJ/mol[/tex]
The enthalpy change ΔH of the reaction = -110.5 kJ/mol
If a gas effuses 2.17 times faster than Xe, what is its molar mass?
Answer:
Molar mass = 27.88 g/mol
Explanation:
The relationship between how gases effuses is given by Graham's law of effusion. This law is given as;
Rg / Rxe = [tex]\sqrt{}[/tex](Mxe / Mg)
Where;
Rg = Rate of effusion of gas g
RXe = Rate of effusion of Xe
Mxe = Molar mass of Xe = 131.29 g/mol
Mg = Molar mass of gas g
From the question;
Rg : Rxe = 2.17 : 1
Rg / Rxe = 2.17 / 1 = 2.17
2.17 = [tex]\sqrt{}[/tex]131.29 / Mg
Squaring both sides
4.7089 = 131.29 / Mg
Mg = 131.29 / 4.7089
Mg = 27.88 g/mol
What one word completes the
If a plant is losing water faster than it can be replaced by its roots, its stomata will
sentence?
Answer:
it causes the cells to become flaccid and the stomata openings to close
Explanation:
the stomata closes to reduce water loss
When a plant is losing water at a greater rate than it can be replaced by its roots, then in such a case, the stomata will get close to reduce the loss of water.
• Generally, the opening of stomata takes place in the day and gets close at night. To prevent the loss of water stomata get close during the night.
• However, in certain cases, even during the day, when the plant experiences loss of water due to conditions like drought then stomata remain close during the day also.
• This opening and closing of stomata take place as a response to the signals from the external environment.
Therefore, when more amount of water is loosing from the plant than getting absorbed by the roots, the stomata gets the signal to remain close to prevent water loss and death of the plant.
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Which of the following would be most likely to experience strong intermolecular forces?
A. Molecules that contain no electrically charged regions.
B. Molecules that contain atoms of oxygen.
C. Molecules that are composed of solely ions.
D. Molecules that have both negatively and positively charged parts.
Answer:
The correct answer is D
Explanation:
Just took quiz
The order is Solumedrol 3 mg/kg for a child weighing 20 kg. Solumedrol is available as 125 mg/2ml. How many ml will be given
Answer:
0.96mL must be given
Explanation:
First, we need to obtain the mass of Solumedrol required for the child by using its mass. Then, with this mass we can solve the volume that must be administered:
Mass of solumedrol required:
20kg * (3mg / kg) = 60mg of solumedrol are required.
Volume given:
60mg Solumedrol * (2mL / 125mg) =
0.96mL must be given
the ______ biodiversity in ecosystem is, the more sustainable it will be.
i think that the more diverse an ecosystem is the more sustainable it will be. do you have a picture of your problem?
how are series and parallel circuits the same?
water H2O is a molecule made of oxygen and hydrogen. The bonds that hold water molecules together are due to share ___, and known as covalent bonds.
determine the molar mass for ammonia (NH3) in g/mol.
Answer:
17.031 g/mol
Explanation:
Prokaryotic is an example of a/an-
A:tissue
B:cell type
C:organ
D:organism
Answer:
B. Cell Type
Explanation:
that is the answer i believe
Answer:
option b- cell type
Explanation:
almost absolutely positive
A patient is prescribed 100mg/day of antibiotic for 2 weeks. The antibiotic is available in vials that contain 20mg/vial of the drug. How many vials are necessary for the entire treatment?
how are the terms atom and element different?
Answer:
Element is made from same type of atoms
While atom is present in element made up of different particles like proton neutrons electron etc
Explanation:
Which word describes the amount of matter an object contains?
altitude
density
mass
pressure
Answer:
Mass
Explanation:
Answered this question multiple times and got it correct
Hope this helped!
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what is the empirical formula for a compound that is 40% S, and 59.9% O?
Answer:
O3S
Sulfur Trioxide
Explanation:
Write ashort note on the
first battle of
of panipat
Answer:
The First Battle of Panipat was fought between the invading forces of Babur and the Lodi Empire, which took place on 21 April 1526 in North India. It marked the beginning of the Mughal Empire. This was one of the earliest battles involving gunpowderfirearms and field artillery.
For you to write an essay on Panipat first bring into view
Introduction body conclusionThen write a brief story using this format.
How to write a short note on the first battle of Panipat?In writing this essay, you must consider the structure and content of the essay or short note
For structure kick off with
Introduction body conclusionIn conclusion, for the content of the short note you can consider this,
Panipat fought its first battle on 21 April 1526 in the North of India, This battle was fought between the invading powers of Babur and the Lodi Empire.
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what is the volume of the rock? if the water rose from 50L to 70mL
How many protons, neutrons, and electrons does Si^4-
Answer:
Silicon has 14 protons, 14 neutrons, and 14 electrons.
Explanation:
Will the composition of water molecules vary depending on their source?
Answer:
It does not matter where the sample of water came from or how it was prepared. Its composition, like that of every other compound, is fixed.
