Answers
Related Questions
If the length, width, and height of a box are 9.50 cm, 6.75 cm and 3.50 cm, respectively, what is the volume of the box in units of milliliters and liters?
(a) How many mL will the box contain?
(b) How many L will the box contain?
Answers
Answer: 1cm³= 1mL
Explanation:
Write an informal definition of half-life.
Answers
the time required for the activity of a substance taken into the body to lose one half its initial effectiveness. Informal. a brief period during which something flourishes before dying out.
hope this helps ^^
A bicycle tire has a pressure of 18.5 lb/in^2 What's the pressure in torr?
Answers
Answer:
B y is a complete collection for your time and energy for the spread of Islam in the Horn of the following to make sure
How many carbon atoms are in 2C7H5N3O6
Answers
Answer:
14
Explanation:
Democritius thought that
are the smallest particles of matter.
Please give 1 answer.
A.
Electrons
B.
Protons
C.
Neutrons
D.
Atoms
Answers
What happens to water when it freezes?
its mass increases
its mass decreases
its density increases
its density decreases
Answers
Explanation:
When an object undergoes a physical change (solid to liquid, decrease in temperature etc.), the mass of the object remains constant.
When water freezes, the water molecules vibrate closer to one another and there is less space between the molecules.
The same number of water molecules now occupy a smaller volume, therefore their density increases.
The correct answer is the 3rd option.
At the time when the water should be freezed so here the density should be decreased.
What is density?The density refers to the mass of the unit volume with respect to the material substance.
The formula for density should be d = M/v
So here d means the density
And, m means mass
V means the volume
So it should be expressed in units with respect to the units of grams per cubic centimeter.
Hence the last option is correct.
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Which of the following equations represents the balanced equation for the reaction of iron and oxygen?
a)
4Fe + 3O2 → 2Fe2O3
b)
2Fe + O2 → Fe2O3
c)
3Fe + 3O2 → 2Fe2O3
d)
Fe + 3O2 → Fe2O3
Answers
Answer:
D is balanced. :)
Among the following equations the one that represents the balanced equation for the reaction of iron and oxygen is a.
4Fe + 3O₂ → 2Fe₂O₃
What is balancing of a reaction?Balancing of a reaction is done according to the "Law of conservation of mass" and balancing helps in solving stoichiometry questions correctly as if we will not balance the reaction then the quantitative results in a particular question doesn't come correctly.
Balancing of a reaction helps in mole concept as well and it is one of the laws of chemical reactions as well.
Some examples of balanced chemical reactions are-
2Mg(s) + O₂(g) ⟶ 2MgO(g)
Ca(OH)₂ + H₃PO₄ → Ca₃(PO₄)₂ + H₂O
Therefore, Among the following equations the one that represents the balanced equation for the reaction of iron and oxygen is a.
4Fe + 3O₂ → 2Fe₂O₃
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If 2.5 grams of calcium bromide reacted with excess lithium oxide, how many grams of bromide product would be formed?
Answers
Answer: 2.17 g of bromide product would be formed
Explanation:
The reaction of calcium bromide with lithium oxide will be:
[tex]CaBr_2+Li_2O\rightarrow 2LiBr+CaO[/tex]
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of calcium bromide}=\frac{2.5g}{199.9g/mol}=0.0125moles[/tex]
As lithium oxide is in excess, calcium bromide is the limiting reagent.
According to stoichiometry :
1 mole of [tex]CaBr_2[/tex] produce = 2 moles of [tex]LiBr[/tex]
Thus 0.0125 moles of [tex]CaBr_2[/tex] will require=[tex]\frac{2}{1}\times 0.0125=0.025moles[/tex] of [tex]NH_3[/tex]
Mass of [tex]LiBr=moles\times {\text {Molar mass}}=0.025moles\times 86.8g/mol=2.17g[/tex]
Thus 2.17 g of bromide product would be formed
8. How many milligrams of iron are delivered from a 250. mg tablet of FeSO4.7H20
Answers
Answer:
[tex]molar \: mass \: of \: FeSO _{4}.7H _{2}0 = (56 + 32 + (16 \times 4) + (7 \times 18)) \\ = 278 \: g \\ \\ (278 \times 1000) \: mg \: of \: FeSO _{4}.7H _{2}0 \: contains \: (56 \times 1000) \: mg \: of \: Fe \\ 250 \: mg \: of \: FeSO _{4}.7H _{2}0 \: contain \: ( \frac{250 \times 56 \times 1000}{278 \times 1000} ) \\ = 50.35 \: mg \: of \: Fe[/tex]
The mass of Fe delivered by 250 mg Iron sulfate heptahydrate has been 50.35 mg.
The molar mass of the compound has been the sum of the mass of each element present in the compound. The given compound is iron sulfate heptahydrate. The compound has molar mass 278 grams.
1 mole of compound has been consisting of 1mole of iron.
278 grams Iron sulfate = 56 grams Fe
278,000 mg Iron sulfate = 56,000 mg Fe.
The mass of iron in 250 mg compound can be given as:
278,000 mg Iron sulfate = 56,000 mg Fe
[tex]\rm 250\;mg \;Iron\;sulfate\;=\;\dfrac{56,000}{278,000}\;\times\;250[/tex]
250 mg Iron sulfate tablet = 50.35 mg Fe.
The mass of Fe delivered by 250 mg Iron sulfate heptahydrate has been 50.35 mg.
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when is light produced during e- configuration
Answers
The photo shows wires made of pure copper, an element
What would the smallest piece of copper be?
A. Copper atom
B. Mixture of different kinds of metallic elements
C. Copper molecule
D. Compound containing two or more elements
Answers
Answer:
B
Explanation:
I hope its right. I'm pretty sure.
Answer:
Explanation:
Copper Atom
When Jorge looks at the Moon from Earth, he sees different phases of the Moon depending on the time of the month he observes the Moon. Why does the Moon have different phases during the month?
Answers
Answer:
Because of the revolution of the moon about the earth.
Explanation:
The moon is the natural satellite of the earth; which rotates about its axes and orbits around the earth. As the moon orbits the earth with respect to time, it would complete a revolution in 27.3 days.
During revolution, different phases of the moon can be observed by someone on the earth. This is due to its location at different time during the process. Therefore, Jorge was able to see different phases of the moon because of its revolution about the earth.
Explaining Radioactive Decay
Explain the process of radioactive decay. What happens during radioactive decay, and what is the result at the end of radioactive decay?
Answers
Answer:
Radioactive decay is the process in which the nucleus of an unstable isotope spontaneously changes, releasing particles and energy. An unstable isotope will continue to decay until it reaches the stable form of either a different isotope of the same element that is stable or a different element that is stable.
Explanation:
Answer:
Sample Response: Radioactive decay is the process in which the nucleus of an unstable isotope spontaneously changes, releasing particles and energy. An unstable isotope will continue to decay until it reaches the stable form of either a different isotope of the same element that is stable or a different element that is stable.
If you want to make your own make sure to include.
- Radioactive decay is the process in which the nucleus of an unstable isotope spontaneously changes, releasing particles and energy.
- An unstable isotope will continue to decay until it reaches a stable form.
- The stable form could be a different isotope of the same element that is stable or a different element that is stable.
Explanation:
Edge 2021
I don’t know this question please help
Answers
Answer: A. is elliptical
B. IS inrregulur C. spiral
Explanation: this should be it
what charged particle is produced during ionic bonds
Answers
Answer:
An ionic bond is formed by the complete transfer of some electrons from one atom to another. The atom losing one or more electrons becomes a cation or a positively charged ion. The atom gaining one or more electrons becomes an anion which is a negatively charged ion.
Identify the following as a chemical (C) or physical property (P):
1. blue color ______
2. melting point ______
3. density ______
4. reacts with water ______
5. flammability (burns) ______
6. solubility (dissolves) ______
7. boiling point ______
8. luster ______
Answers
Answer: 1. Phys 2. Phys 3. Phys 4. Chem 5. Chem 6. Phys 7. Phys 8. Phys
Explanation:
According to the concept of physical and chemical property ,reaction with water and flammability are chemical properties while rest are physical properties.
What are chemical properties?These properties are defined as those properties which become evident during or after a chemical reaction after the identity of the substance is changed during chemical reaction.
These properties cannot be determined externally just by viewing the substance ,these change immensely after a substance undergoes a chemical change.These are used for identification of unknown substances and for building up chemical classifications.
The major chemical properties are flammability,toxicity,reactivity,acidity and heat of combustion.For a chemical property to be apparent , it is necessary that the structure of the substance is altered.
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need help with this question plsssss
Answers
Answer:
234
Explanation:
What three types of particles make up an atom? What are their charges?
Answers
Answer:
Protons, neutrons, and electrons are the three main subatomic particles found in an atom. Protons have a positive (+) charge. An easy way to remember this is to remember that both proton and positive start with the letter "P." Neutrons have no electrical charge.
Answer:
Protons, positive charge
Neutrons, neutral
Electrons, negative charge
Explanation:
Which of the 3 particles can never change without changing the identity of the atom?
Answers
Answer:
Neutrons,Electrons and Protons I think.
15 POINTS!!
In the South Texas Plains, the Rio Grande River flows along the southern border of the state. The Rio Grande shapes the region through the processes of weathering, erosion, and deposition. Which of the following is an example of the river forming a depositional feature?
A.
As the water's speed decreases along the inside edge of a curve, sediment is laid down to form a point bar.
B.
As the water flows along the outside edge of a curve, it removes rock and soil from the river bank.
C.
As the water's speed increases, it scours deep grooves in the muddy river bottom.
D.
all of these
Answers
Answer:
A) As the waters speed decreases along the inside edge of a curve, sediment is laid down to form a point bar
Explanation:
Depositional landforms are the visible evidence of processes that have deposited sediments or rocks after they were transported by flowing ice or water, wind or gravity.
The answer is not 53.4. Please help.
Answers
Answer:
it is 0.528 ATM.
Explanation:
One of the steps to sweeten sour gas using the Claus process is reacting
hydrogen sulfide gas with sulfur dioxide gas to produce water vapour and sulfur.
16 H2S(g) + 8 SO2(g) → 16 H2O(g) + 3 Sg(s)
8.56 kL of hydrogen sulfide at 175 kPa and 250 °C reacts with excess sulfur
dioxide. Calculate the mass, in kg, of sulfur produced.
Answers
The mass, in kg, of Sulfur produced : 2.072 kg
Further explanationGiven
V = 8.56 kL = 8560 L
P = 175 kPa = 1,73 atm
T = 250 + 273 = 523 K
Required
mass of Sulfur produced
Solution
mol of H₂S :
[tex]\tt n=\dfrac{PV}{RT}\\\\n=\dfrac{1.73\times 8560}{0.082\times 523}\\\\n=345.3[/tex]
mol of Sulfur based on mol H₂S as a limiting reactant( excess Sulfur dioxide)
From equation, mol ratio H₂S : S = 16 : 3, so mol S :
[tex]\tt \dfrac{3}{16}\times 345.3=64.74[/tex]
Mass S(Ar = 32 g/mol) :
= mol x Ar s
= 64.74 x 32
= 2071.68 g = 2.072 kg
What can help overcome a positive enthalpy of solution and allow a solid
solute to dissolve in water?
A. A decrease in entropy
B. A large amount of energy released
C. A large amount of energy absorbed
D. An increase in entropy
Answers
Answer: D. An increase in entropy
Explanation:
Entropy is the measure of randomness or disorder of a system. If a system moves from an disordered arrangement to an ordered arrangement, the entropy is said to increase and vice versa.
For a reaction to be spontaneous, the enthalpy of the solution must decrease and the entropy must increase.
To overcome a positive enthalpy of solution and allow a solid solute to dissolve in water, an increase in entropy would make the reaction spontaneous as the system would move to a more disordered state.
Hello! Does anyone know how the structural formula of 2, 2 dimethyl butane is? Please help!
Answers
Answer:
I have it.
Explanation:
Matter that is made up of only one kind of Atom
Answers
Answer:
elements
Matter that has only one kind of atom is called an element. Gold, copper, oxygen, and mercury are examples of elements. Most matter is made up of two or more different kinds of atoms that are chemically combined. This kind of matter is called a compound.
Explanation:
Answer:
Element
Explanation:
This is the answer because:
1) All matter is made up of substances called elements.
2) Matter that iis made up of only one kind of Atom is called an Element.
Hope this helps! :D
plz help me with this :)
Answers
Answer:
they are randomly moving
Explanation:
Answer:
B
Explanation:
Red shift indicates that stars are moving further away.
During ____, the chromatin condenses to make ____.
prophase, chromosomes
metaphase, chromosomes
prophase, DNA
metaphase, DNA
Answers
xg 4Na + 15g 02 → 70g 2Na20
Answers
Answer: 43.125g
Explanation:4Na+ O2=2Na2O
Molar mass: 23. 32. 62. React.mass: 92.
how was bohr´s atomic model different from those of previous scientists
Answers
Answer:
Explanation:
Neils Bohr in 1913 put forward his own model of the atoms based on the quantum mechanics originally developed by Planck.
He assumed the Rutherford's model and suggested that the extranuclear space consists of electrons in specific spherical orbitals around the nucleus. His predecessors and contemporaries did not give this perspective to the atomic model. The orbits/energy levels are designated by letters K, L, M, N .... The maximum number of electrons that can be accommodated by an energy level is 2n² where n is the principal energy level.Answer:
It showed that electrons could jump from one path to another
Explanation:
quiz
Explain why Chlorine has the largest electronegativity between Ne, Mg, Ba, Sb, Hg, Li?
Answers
Answer:
Look at the image provided and try work it out. I don't have the time but I hope I helped you!
Explanation:
