Answers
Related Questions
the atomic number of calcium is 20 . the maximum possible numbers of electron in m-shell is a 2 b 8 c 18 d 10
Answers
Answer:
8
Explanation:
Electronic configuration of Calcium = 2, 8, 8, 2
M shell = 3rd energy level
Maximum number of shells in m shell is 8
How do double replacement reactions relate to Combustion reactions
Answers
Explanation:
A single-replacement reaction replaces one element for another in a compound.
A double-replacement reaction exchanges the cations (or the anions) of two ionic compounds.
A precipitation reaction is a double-replacement reaction in which one product is a solid precipitate.
Solubility rules are used to predict whether some double-replacement reactions will occur.
1. Is the reaction between magnesium and oxygen in the air spontaneous?
Answers
Answer:
Once ignited, a ribbon of magnesium metal burns freely in air to form solid magnesium oxide in the form of a white powder. The reaction is plainly spontaneous even though ΔS is negative.
If gasoline costs $3.13 per gallon, how many gallons of gasoline could you purchase for $21.00 ?
Round your answer to the nearest hundredth place.
____________ gallons
Answers
Answer:
7 gallons
Explanation:
Just do the math
$21 x 1 gallon/$3 =7 gallon
1. The compound 2NaCl consists of A.2 atoms of sodium element B. 1 atom of
chlorine element C. 3 atoms of sodium element D. 1 atom of sodium element
2. The valency of iron in iron (III) sulphate is A.3 B.2
C.4
D.5
3.The systematic name of the compound Cuso, is A. Copper (I) sulphate B.Copper
(II) tetraoxosulphate C.Copper (II) tetraoxosulphate (IV) D.Copper (II)
tetraoxosulphate (VI)
Answers
Answer:
1. The compound 2NaCl consists of:
» B. 1 atom of chlorine element.
» D. 1 atom of sodium element.
2. The valency of iron in iron (III) sulphate is:
» A. 3 [ valency of only iron ]
» B. 2 [ valency of only sulphate ion ]
3.The systematic name of the compound CuSO4:
» B. Copper (II) sulphate
Explanation:
[tex].[/tex]
Answer:
1) A.
2) A.
3) A.
If I initally have a gas at a pressure of 12 atm, a volume of 23 L, and a temperature of 200 K, and then I raise the pressure to 14 atm and increase the temperature to 300 K, what is the new volume of the gas?
Answers
Answer: 30 L
Explanation: Use the combined gas law: P1V1/T1 = P2V2/T2
We want V2, so rearrange:
V2 = V1(T2/T1)(P1/P2)
Note how I've grouped the temperature and pressure into ratios. This allows us to cancle those units quickly and gives a perspective on what we should expect. Enter the data:
V2 = (23L)*(0.6667)*(0.8571)
V2 = 29.6 L 30 L for 2 sig figs
At constant pressure and volume, the density of a gas _____ as the molar mass increases. A gas made of heavier particles will have a _____ density than a gas composed of lighter particles under the same conditions of temperature and pressure.
Answers
Answer:
Increases, higher
Explanation:
Remember that the formula for Density is D=mass/volume.
If volume remains the same, as mass increases the density will also increase as the numerator of this math problem increases while the denominator remains the same.
(a) At constant pressure and volume, the density of a gas increases as the molar mass increases.
(b) A gas made of heavier particles will have a greater density than a gas composed of lighter particles under the same conditions of temperature and pressure.
Ideal gas equationThe relationship between density and molar mass is given in the following equations;
PV = nRT
PV = (m/M) RT
PV = (ρV/M)RT
P = (ρ/M)RT
P = (ρRT)/M
PM = ρRT
where;
P is pressureρ is densityM is molar massThus, we can conclude that, at constant pressure and volume, the density of a gas increases as the molar mass increases.
A gas made of heavier particles will have a greater density than a gas composed of lighter particles under the same conditions of temperature and pressure.
Learn more about density of gases here: https://brainly.com/question/18992505
During an experiment, it is observed that iron powder sinks in water and sulfur powder floats in water. What will most likely be observed when sulfur powder and iron powder are mixed together and then added to water?
Answers
Answer: The iron will sink and the sulfu will float
Explanation: The iron/sulfu mixture only mixes the two elements. Unless one ignites them, they will remain elements and can be separated based on the difference in their densities.
Use the drop-down menus to complete the statements.
__________have a definite shape and volume.
__________do not have a definite volume or shape.
___________have a definite volume, but the shape may change.
Answers
Answer:
Solids, Gasses, Liquids
Explanation:
Solids are rigid structures that have a definite share and volume.
Gasses will continue to spread indefinitely until pressure prevents further spreading.
Liquids have a volume but take the shape of the container they are in.
calculate the mass of iron (iii) carbonate that will be formed when 15.0 mL of 0.15 M iron (iii) chloride solution are reacted with 20.0 mL of 0.15 M sodium carbonate. Be sure to write the balanced metathesis reaction that is occuring.
Answers
Answer:
The molar mass of a substance is calculated as the mass of a given chemical compound or substance, which is then divided by the amount of the substance. The mass is calculated in grams and the amount of the substance is calculated in mol. Thus, the standard unit for molar mass is g/mol.
Explanation:
According to the given question, the reaction between iron chloride and sodium carbonate will be given as:
[tex]\text {3Na_{2}CO_{3}\text} \;\[+\] \;\text{ 2FeCl_{3} \text}\; \rightarrow\; \text {6NaCl}\; \[+\] \;\text { Fe_{2} (CO_3)_{3} \text}[/tex]
Now, to calculate the mass of iron carbonate formed in the above chemical reaction, it will be given as:
[tex]{ \text Moles\;of}\text \;\text {FeCl_{3} \text} \[=\dfrac{0.15 \;\text {moles} \times 0.015\; \text L}{1.0 { \;\text L}\text}[/tex]
[tex]=\;0.00225\; \text {moles}\text[/tex]
Similarly, for sodium carbonate
[tex]\text Moles\; of\; Na_{2}CO_{3}}\te \[=\]\dfrac{0.15 \;\text {moles} \times 0.020\; \text L}{1.0 { \;\text L}\text}\\[/tex]
[tex]\[=\]\;0.0003\; {\text moles \text}[/tex]
Limiting reactant is [tex]\text {FeCl_{3} \text}[/tex]
Now, calculating iron chloride mass:
[tex]=\dfrac{0.00225 \times 1\;\text{moles}\;\text{Fe}_2 {(\text{CO}_3)}}{2\;\rm{moles\;of\;}Fecl_3}[/tex]
[tex]=0.001125 \;\text {moles }[/tex]
Now, molar mass of the [tex]\text{Fe}_{2}\text{CO}_{3}[/tex] will be [tex]=291.71679\;\text{g/ mol}[/tex]
[tex]\begin{aligned}\text{Mass}&=\frac{\text{Moles}}{\text{Molar mass}}\\\\&=\frac{0.001125\;\text{moles}}{291.71679\; \text{g/mol}} \\\\&=3.85648\times10^{-6} \end{aligned}[/tex]
what is mass in chemistry definition?
Answers
Answer: mass is the amount of matter in one object or substance
Explanation:
Calculate the density of sulfuric acid if 50. mL of the acid weighs (mass) 144. g.
a
b. 3.6 g/mL
b
d. 1.8 g/mL
c
a. 4.8 g/mL
d
b. 2.0 g/mL
Answers
Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question we have
mass = 144 g
volume = 50 ml
We have
[tex]density = \frac{144}{50} \\ = 2.88[/tex]
We have the final answer as
2.88 g/mLHope this helps you
Calculate the mass of 2.75 moles of ammonia.
Plz Fast Urgent
I will give brainliast
Answers
Explanation:
1 grams Ammonia to mol = 0.05872 mol
mass of ammonia = 2.75÷ 0.05872
mass of ammonia=46.8324250681 gm
Answer:
[tex]\boxed {\boxed {\sf 46.8 \ g \ NH_3}}[/tex]
Explanation:
We are asked to calculate the mass of 2.75 moles of ammonia.
1. Molar MassWe convert moles to grams using the molar mass or the mass of 1 mole of a substance. These values are equivalent to the atomic masses on the Periodic Table, but the units are grams per mole instead of atomic mass units.
Look up the individual elements in the compound of ammonia: NH₃
Nitrogen: 14.007 g/mol Hydrogen: 1.008 g/molNotice that there is a subscript of 3 after H in the chemical formula. There are 3 moles of hydrogen in 1 mole of ammonia. We must multiply hydrogen's molar mass by 3 before adding nitrogen's molar mass.
H₃: 1.008 * 3 = 3.024 g/mol NH₃: 14.007 + 3.024 = 17.031 g/mol 2. Convert Moles to GramsWe convert using dimensional analysis. First, set up a ratio using the molar mass.
[tex]\frac {17.031 \ g \ NH_3}{ 1 \ mol \ NH_3}[/tex]
We are converting 2.75 moles of ammonia to grams, so we multiply the ratio by this value.
[tex]2.75 \ mol \ NH_3 * \frac {17.031 \ g \ NH_3}{ 1 \ mol \ NH_3}[/tex]
The units of moles of ammonia cancel.
[tex]2.75 * \frac {17.031 \ g \ NH_3}{ 1}[/tex]
[tex]46.83525 \ g \ NH_3[/tex]
3. RoundThe original measurement of moles (2.75) has 3 significant figures, so our answer must have the same. For the number we calculated, that is the tenth place. The 3 in the hundredth place tells us to leave the 8 in the tenth place.
[tex]46.8 \ g \ NH_3[/tex]
There are approximately 46.8 grams of ammonia in 2.75 moles of ammonia.
Apakah perbezaan kakilauan permukaan rod kuprum dan karbon
Answers
Answer:
soalan ni yang ni tahun atau tingkatan
Three blocks are shown. Which statement is correct?
Block A has the greatest density.
Block B has the greatest density.
The density of Block A is equal to the density of Block B.
The density of Block B is equal to the density of Block C.
Answers
Answer:
Block B i thinkExplanation:
i think its b
11:48 Tue 24 Aug
47%
3. Graphite, aform of carbon, conducts electricity because it has:
(1 Point)
Answers
Answer:
carbon because it is the main answer of these
hi <3
graphite is able to conduct electricity because it has delocalised electrons.
explanation:
carbon can bond 4 times, but in graphite it is only bonding to three other carbons, leaving one electron free to carry charge
hope this helps <33
HELP IM TIMED!!!!!!!!!
Yellowstone National Park has an average of about 4500 bison living in it. The park covers 3472 square miles. What is the population density of bison living in Yellowstone? a. 1.3 bison/mi^2 b. 16 bison/mi^2 c. 77 bison/mi^2 d. 0.77 bison/mi^2
Answers
Answer:
A. 1.3 bison/mi^2
Explanation:
4500 bison divided by 3472 sq miles is 1.3 bison per mile squared.
Hello. Can someone help me do these few questions. Thanks
Answers
Answer:
In chemistry, an element is a pure substance consisting only of atoms that all have the same numbers of protons in their atomic nuclei. Unlike chemical compounds, chemical elements cannot be broken down into simpler substances by chemical means. Wikipedia
Give reasons. mass is called a physical quantity.
Answers
Answer:
Mass is a Physical quantity
Explanation:
It is a fundamental physical quantity because it cannot be derived from other physical quantities.
.
.
.
Hope it helps
which elements are liquid in the periodic table?
Answers
Matter doesn't have to take up space as long as it has mass.
Answers
Answer:
Matter always takes space (or has volume).
Answer:
False. Everything that has mass takes up space.
Explanation:
The charge of most poly atomic ions is _____
Answers
Explanation:
They mostly have negative charges
A kind of scientific idea that tells you what will happen in a specific situation is a(n)
Answers
Answer:
technology scientific methods
Answer:
[tex]⚪ \: { \sf{law}}[/tex]
Use you observation to determine which polymorph is in the customer’s returned chocolate sample.
Answers
Answer:
Cocoa butter, the fat in chocolate, can crystallize in any one of 6 different forms (polymorphs, as they are called). Unfortunately, only one of these, the beta crystal (or Form V), hardens into the firm, shiny chocolate that cooks want. Form VI is also a stable hard crystal, but only small amounts of it form from the good beta (Form V) crystals upon lengthy standing. When you buy commercial chocolate it is in the form of beta crystals.
When you melt chocolate and get it above 94° F, you melt these much desired beta crystals and other types of crystals can set up. If you simply let melted chocolate cool, it will set up in a dull, soft, splotchy, disgusting-looking form. Even the taste is different. Fine chocolate has a snap when you break it and a totally different mouthfeel from the other cocoa butter forms.
Answer:
When you melt chocolate and get it above 94° F, you melt these much desired beta crystals and other types of crystals can set up. If you simply let melted chocolate cool, it will set up in a dull, soft, splotchy, disgusting-looking form. Even the taste is different. Fine chocolate has a snap when you break it and a totally different mouthfeel from the other cocoa butter forms.
Explanation:
hope it's help you......!!!!!!!
#rishu
what are lower and higher energy levels.
Answers
Answer:
If an atom, ion, or molecule is at the lowest possible energy level, it and its electrons are said to be in the ground state. If it is at a higher energy level, it is said to be excited, or any electrons that have higher energy than the ground state are excited
Explanation:
pls mark brainliest
Earth and Jupiter are shown next to each other. Earth is much smaller than Jupiter.
Why is Jupiter so much larger than Earth? Check all that apply.
Inner planets were created at higher velocities.
Outer planets have less gravity than inner ones.
Outer planets attracted helium, hydrogen, and other gasses.
Inner planets formed where temperatures were cooler.
Gases escaped from inner planets and not from outer ones.
Answers
Answer:
A, C, and E. I hope you have a good day.
Explanation:
Answer:
1, 3, and 5
Explanation:
Can someone help me on this
Answers
I did this to the best of my ability. I have a hard time comprehending things sometimes so I’m so so so sorry if it’s wrong
Tyrone and Valerie wanted to determine what feature of a paper airplane would cause it to fly the farthest. Tyrone made his airplane with longer wings than Valerie's airplane. Valerie's airplane had shorter wings than Tyrone's. After testing the two airplanes several times, the data shows that wider wings help airplanes fly farther than shorter wings.
Which characteristic of science is missing from this experiment?
The question is not testable because paper airplanes are always changing.
The phenomenon is not observable because air resistance changes.
The experiment is not replicable because controlled variables are not included.
The results are not reliable because the airplanes were only tested one time.
Answers
The characteristic of science that is missing from this experiment is that "the results are not reliable because the airplanes were only tested one time".
Some of the characteristics of science include objectivity, verifiability , reliability, accuracy, observable, precision etc.
Based on the question asked, the results of the experiment are not reliable due to the fact that the the airplanes were only tested one time. The airplanes should have been tested multiple times to show that they are reliable.
In conclusion, the correct option is D.
Read related link on:
https://brainly.com/question/5500131
Answer:
D
Explanation:
Describe hydrogen's atomic structure and its molecular structure.
Answers
Explanation:
A hydrogen atom is an atom of the chemical element hydrogen. The electrically neutral atom contains a single positively charged proton and a single negatively charged electron bound to the nucleus by the Coulomb force. Atomic hydrogen constitutes about 75% of the baryonic mass of the universe.
Names: hydrogen atom, H-1, protium, ¹H
Protons: 1
Neutrons: 0
Symbol: 1H
Answer:
The hydrogen atom has a nucleus consisting of a proton bearing one unit of positive electrical charge; an electron, bearing one unit of negative electrical charge, is also associated with this nucleus.
Explanation:
i really need help please
Answers
Answer: its blank???
Explanation: