Answer:
The South American and African plates moved apart as a divergent boundary formed between them and an ocean basin formed and spread. Students figure out: The Mesosaurus fossils moved apart gradually over tens of millions of years. Earth's plates travel at a rate too slow to be experienced by humans.
Explanation:
What is the net ionic equation for the reaction below?
2H+ + CO32– + 2Na+ + 2OH– 2Na+ + CO32– + 2H2O
Answer:
The given reaction in your problem is the ionic equation for an acid (carbonic acid) reacting with a base (sodium hydroxide). All components of the reaction are then written in ionic form except for reactant weak electrolytes and the driving force product compound of the reaction (H2O). See following explanation.
Explanation:
Metathesis Rxn: molecular equation of rxn
H₂CO₃(aq) + 2NaOH(aq) => Na₂CO₃(aq) + 2H₂O(l)
Ionic Equation: shows all components of the reaction
H₂CO₃(aq) + 2Na⁺(aq) + 2OH⁻(aq) => 2Na⁺(aq) + CO₃²⁻(aq) + 2H₂O(l)
H₂CO₃(aq) wk. electrolyte and H₂O(l) driving force compound are not shown ionized in ionic equation. Only strong electrolytes that ionize 100%; i.e., salts and strong acids and bases.
Net Ionic Equation: shows only the reactive components without the spectator ions (nonreactive components), in this case, the Na⁺(aq) ions.
H₂CO₃(aq) + 2OH⁻(aq) => CO₃²⁻(aq) + 2H₂O(l)
will these compounds have triple, single, or double bonds ?
C02
Br2
Answer:
double bond
Explanation:
it contains combinations
How is the periodic table organised?
The periodic table brings order to information about the chemical elements. The chemical elements are arranged in order of increasing atomic number. The horizontal rows are called periods and the vertical columns are called groups. Elements in the same group have similar chemical properties.
What is the concentration of a solution of HBr if 0.40 L is neutralized by 0.20 L of 0.50M solution of LiOH?
Human body cells are made by doing what ?
Answer:
When cells become damaged or die the body makes new cells to replace them. This process is called cell division. One cell doubles by dividing into two. Two cells become four and so on.
Explanation:
what type of ion do elements from each of the following groups form ,
group1
group 7.
Answer:
group 1 - cations charge +1
group 7 - anions charge -1
Explanation:
Group 1 has one valence electron and will lose one electron to complete the octet.
Group 7 has 7 valence electrons and will accept an electron to complete the octet.
Group 1 elements form cations while group 7 elements form anions as per their electronic configuration.
What is electronic configuration?
Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
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Give six examples of complex compounds.
Answer:
Examples of complex compound include potassium ferrocyanide K4[Fe(CN)6] and potassium ferricyanide K3[Fe(CN)6]. Other examples include pentaamine chloro cobalt(III) chloride [Co(NH)5Cl]Cl2 and dichlorobis platinum(IV) nitrate [Pt(en)2Cl2](NO3)2.
Explain how increasing the pressure of a gas affects rate of reaction.
Cheerleading.......
what is the hardest stunt in cheerleading in cheerleading
A. One Man B. Thigh Stunt C. Basket toss stunt D. Nugget stunt
Answer:
C.basket toss stunt
Explanation:
If you are on a competition cheerleading squad, making difficult cheerleading ... basket toss is considered an advanced cheerleading stunt
Answer:
C basket toss stunt
Explanation:
A 7.50 liter sealed jar at 18 degrees C contains 0.125 moles of oxygen and 0,125 moles of nitrogen gas. What is the pressure in the container?
Which example would result in new cells that are most different from the parent cells?
a. yeast cells splitting into new cells
b. bacteria cells dividing into new cells
c. sperm and egg cells uniting to produce fertilized egg cells
d. skin cells dividing to produce more skin cells
Answer:
a
Explanation:
its a lol
the symbol for the element in period 2, group 13
After reading about the kinds of changes that occur, Yara saw some rust on a pipe that was
going into her house. What kind of change is the formation of rust? *
reactant
product
chemical
physical
Answer:
chemical
Explanation:
Chemical change is a type of change that involves the formation of new substances. The process of forming this new substance is irreversible i.e. cannot be changed back into it's normal form. Chemical changes is characterised by color changes, gas evolution etc.
In this case, a RUST on a pipe is being described. This rust is a type of chemical change because it involves a change in color and also a new substance is formed.
write any 2 uses of fractionate distillation
Answer:
Fractional Distillation could be used to:
Obtain the different fractions of a crude which may have more uses and be more useful.Obtain ethanol from a mixture of ethanol and water.Fractional Distillation is used to obtain one substance from a mixture. It depends on the boiling points of the substances.
What is the molarity of a solution containing 29g of NaCl in 1L solution?
Answer:
hope this helps
Explanation:
1M NaCl solution is 58.5 g/1000 ml , where molecular wt of NaCl being 58.5 grams , so 29.2 g of NaCl in 1000 ml of water will be equal to : 29.2g /58.5g = 0.499145299 M , so 29.2 g NaCl dissolved in 100 ml would correspond to , 0.499145299 M X 1000 ml/100 ml = 4.99145 M or about 4.99 M
How much water is needed to prepare a .50 molal solution using 0.50 moles of sodium chloride??
The amount of water needed to prepare a 0.50 molal solution using 0.50 moles of sodium chloride is 1L.
How to calculate volume?The volume of a solution can be calculated using the following formula:
Volume = no of moles ÷ molarity
According to this question, 0.50 molal solution is used to prepare 0.50 moles of sodium chloride. The volume of the solution is calculated as follows:
Volume = 0.50 moles ÷ 0.5M
Volume = 1L
Therefore, the amount of water needed to prepare a 0.50 molal solution using 0.50 moles of sodium chloride is 1L.
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Which of these results in kinetic energy of an object? position mchotion
Answer:
..... yep
Explanation:
tep no yep no hyshshshss
motion results in the kinetic energy of an object
Calculate the change in heat (Q) that occurs when 27.58grams of liquid water at 16°C heats to water vapor at 62°C. (cp = 4.184 J/g°C)
Answer:
5308.16J
Explanation:
Using the formula;
Q = m × cp × ∆T
Where;
Q = change in heat (J)
m = mass of substance (g)
cp = specific heat capacity (4.184 J/g°C)
∆T = change in temperature (°C)
According to the information given in this question;
Q = ?
m = 27.58 grams
cp = 4.184 J/g°C
∆T = 62°C - 16°C = 46°C
Using Q = m × cp × ∆T
Q = 27.58 × 4.184 × 46
Q = 5308.157
Q = 5308.16J
ASAP
The directions "shake well before using" are listed on special types of heterogeneous mixtures called
A- Solutions
B- Suspensions
I am currently learning this and I would say Suspensions!
Hope this helps :)
Four atoms have the numbers of protons and neutrons given below.
Which two atoms are isotopes of the same element?
W: 8 protons and 8 neutrons
X: 8 protons and 10 neutrons
Y: 10 protons and 8 neutrons
Z: 9 protons and 10 neutrons
X and Y
W and X
X and Z
Answer:
W and X
Explanation:
isotopes : are masses of atoms with the same number of proton and electron but different neutron .
W and X have the same number of protons and different number of neutrons.
What happens to the sugar that plants make during photosynthesis?
문
F
It is recycled in the soil and through the roots so other consumers
can grow
It is released by the stoma in the leaves and made available to
other consumers
It is used for growth and maintenance of the plant and a small
amount is available to feed consumers.
None of the above
Answer:
glucose
Explanation:
plants use sunlight water and the gases in the air to make glucose which is aform of sugar
Very long question but PLZ help
20. Calculate the hydrogen-ion concentration [H + ] for the aqueous solution in which [OH – ]
is 1 x 10 –11 mol/L. Is this solution acidic, basic, or neutral? Show your work. (3 points) Use
K w to solve for the hydrogen ion concentration here. Then, once you have your numerical
answer (with units!), answer the question about the solution.
Calculate the hydrogen-ion concentration (show all set up work with calculations) – (2 pts)
Discuss your answer and how it is related to the solution being acidic, basic or neutral and then
identify your solution as acidic, basic or neutral based on your calculated hydrogen-ion
concentration. – (1 pts)
Kw = [H+][OH-]
[OH] = 1.0 x 10^-11 M
Kw = 1.0 x 10^-14
[H+] = Kw/[OH-] = 1.0 x 10^-14 / 1.0 x 10^-11 = 1.0 x 10^-3 M
The solution is acidic, because [H+] > [OH-].
How many molecules in 4NH3
Answer:
16
Explanation:
4 nitrogen (N) atoms and 12 (3×4) atoms in Hydrogen (H)
Total = 4 + 12 = 16 molecules
How many atoms in 98.2 g of He?
9 The Haber process is a reversible reaction. N2(g) + 3H2(g) 2NH3(g) The reaction has a 30% yield of ammonia. Which volume of ammonia gas, NH3, measured at room temperature and pressure, is obtained by reacting 0.75 moles of hydrogen with excess nitrogen?
Answer: 3.36 L of ammonia gas
Explanation:
The balanced chemical reaction is:
[tex]N_2(g)+3H_2(g)\rightarrow 2NH_3(g)[/tex]
According to stoichiometry :
3 moles of [tex]H_2[/tex] produce = 2 moles of [tex]NH_3[/tex]
Thus 0.75 moles of [tex]H_2[/tex] will producee=[tex]\frac{2}{3}\times 0.75=0.50moles[/tex] of [tex]NH_3[/tex]
But as percent yield is 30 %, amount of ammonia produced = [tex]\frac{30}{100}\times 0.50moles=0.15moles[/tex]
According to ideal gas equation:
[tex]PV=nRT[/tex]
P = pressure = 1 atm
V = Volume = ?
n = number of moles = 0.15
R = gas constant =[tex]0.0821Latm/Kmol[/tex]
T =temperature =[tex]273K[/tex]
[tex]V=\frac{nRT}{P}[/tex]
[tex]V=\frac{0.15\times 0.0820 L atm/K mol\times 273K}{1atm}=3.36L[/tex]
Thus 3.36 L of ammonia gas is obtained by reacting 0.75 moles of hydrogen with excess nitrogen.
3.36 L of ammonia gas.
The balanced chemical reaction is:
[tex]N_2(g) + 3H_2(g)\rightarrow 2NH_3(g)[/tex]
According to the above reaction:- :
3 moles of [tex]H_2[/tex] produce = 2 moles of [tex]NH_3[/tex]
Thus 0.75 moles of [tex]H_2[/tex] will produce[tex]\frac{2}{3} \times0.75=0.50\ mol\ NH_3[/tex]
But as percent yield is 30 %, amount of ammonia produced = [tex]\frac{30}{100} \times0.50\ moles\\\\=0.15\ moles[/tex]
According to ideal gas equation:
[tex]PV=nRT[/tex]
P = pressure = 1 atm
V = Volume = ?
n = number of moles = 0.15
R = gas constant =0.0821 Latm\Kmol
T =temperature =273 K
[tex]V=\frac{nRT}{P} \\\\=\frac{0.15\ times0.0820\ Latm\Kmol\times273\ K}{1\ atm} \\\\=3.36\L[/tex]
Hence, 3.36 L of ammonia gas is obtained by reacting 0.75 moles of hydrogen with excess nitrogen.
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Balance the equation by putting the correct number in front of each compound. You can work this out mathematically or by drawing pictures on a piece of paper like the videos.
Al + 02--> Al203 corrosion of aluminum
Answer:
4Al + 3O₂ —> 2Al₂O₃
The coefficients are: 4, 3, 2
Explanation:
__ Al + __ O₂ —> __ Al₂O₃
The above equation can be balance as illustrated below:
Al + O₂ —> Al₂O₃
There are 2 atoms of O on the left side and 3 atoms on the right side. It can be balance by writing 3 before O₂ and 2 before Al₂O₃ as shown below:
Al + 3O₂ —> 2Al₂O₃
There are 4 atoms of Al on the right side and 1 atom on the left side. It can be balance by writing 4 before Al as shown below:
4Al + 3O₂ —> 2Al₂O₃
Now the equation is balanced.
The coefficients are: 4, 3, 2
When a solid suddenly appears when two substances are mixed, and it settles to the bottom, collects on another object, or makes a solution loudy, that solid is known as a _____. pls help ASAP!
Answer:
Precipitates Form
Explanation:
I apologize if I am wrong
ASAPPPPP
how do 2 positive charge move in an electric field
Answer:
yer
Explanation:
Find the molar mass of CaCO3
Answer:
molar mass of caco3 is
100.0869 g/ mol
Baking soda (sodium bicarbonate) is a compound commonly used in baked goods, as a deodorizer in refrigerators, and as an antacid. Commercial quantities of baking soda are produced by mixing soda ash dissolved in water with carbon dioxide. Baking soda precipitates as a solid from this method:
Na2CO3 + CO2 + H2O → 2NaHCO3
How many grams of soda ash would be needed to produce 1,000 g of sodium bicarbonate?
Answer:631 g
Explanation: bc i did the math
630.581 grams of soda ash would be needed to produce 1,000 g of sodium bicarbonate.
How we calculate moles from grams?Moles can be related to the mass or weight of any substance as follow:
n = W/M, where
W = given mass
M = molar mass
Given balanced chemical equation for the formation of sodium bicarbonate is:
Na₂CO₃ + CO₂ + H₂O → 2NaHCO₃
From the stoichiometry of the reaction, it is clear that:
1 mole of Na₂CO₃ is required = to form 2 moles of NaHCO₃
Or 1/2 mole of Na₂CO₃ is required = to form 1 moles of NaHCO₃
Moles of NaHCO₃ be calculated by using the above formula as:
n = 1,000g (given) / 84.007g/mole = 11.90 moles
So, moles of Na₂CO₃ required to form 11.90 moles of NaHCO₃ = 11.90×1/2 = 5.95 moles
Now we convert the mole of Na₂CO₃ to grams by using the mole formula:
W = 5.95mole × 105.98g/mole = 630.581 grams.
Hence, 630.581 grams of soda ash would be needed.
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