Bothe calcium and radium are second group elements in periodic table with two valence electrons. They exhibit similar physical and chemical properties.
What are groups in periodic table?All the elements in periodic table are classified into different groups and periods. The horizontal rows in periodic table are called periods. From left to right in a period the atomic number increases.
The vertical columns in the periodic table are called groups. Down a group the number of shells increases thereby the atomic size also. A group contains elements with same number of valence electrons and similar physical and chemical properties.
Calcium and radium are in the second group of periodic table and they are called the alkaline earth metals. Both contains two valence electrons and they will participate in chemical bonding by losing these two electrons and thus are divalent cations.
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Explain anaerobic respiration with yeast in your own words
Answer:
Anaerobic respiration takes place in the absence of oxygen.
Anaerobic respiration in yeast is used during brewing and bread-making.
Explanation:
glucose → ethanol + carbon dioxide.
C 6H 12O 6 → 2C 2H 5OH + 2C0 2.
Which has greater kinetic energy, a car going 30 mph or one going 40 mph energy?
Using the bond energy values in the previous question, which molecule
releases the most energy when forming its bonds? *
H2
Cl2
Br2
bond energies:
H-H 432
CI - CI 239
Br-Br 193
i cant tell if its h2 or br2 because im not sure what the question is asking
Hydrogen molecule is a molecule that releases the most energy when forming its bonds as compared to other molecules.
What bond needs more energy?We know that H-H bond energy is 432 kJ mol-1, CI - CI bond energy is 239kJ mol-1 and Br-Br bond energy is 193 kJ mol-1 so from this data we can conclude that more energy is required to break the bond between hydrogen atom.
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Calculate how many grams of hydrogen can be burned if the limiting factor is 40 liters of oxygen at 200 K and 1 atm.
Since oxygen is the limiting factor of the reaction, 7.14 g of hydrogen is required to react with 40 litres of oxygen.
What is the limiting factor in a reaction?The limiting factor in a reaction is that factor which the reaction depends on in order to proceed.
Once the limiting factor in a reaction is absent, the reaction will stop.
In the reaction between hydrogen and oxygen, twice the volume of hydrogen is required to react with oxygen.
In the given reaction, oxygen is the limiting factor.
Volume of oxygen = 40 litres
Volume of hydrogen required = 40 × 2 = 80 litres
Mass of 22.4 L of hydrogen = 2.0 g
Mass of 80 Litres = 80/22.4 × 2.0 g
Mass of hydrogen = 7.14 g
Therefore, 7.14 g of hydrogen is required to react with 40 litres of oxygen.
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Gases that are abundantly emitted by volcanoes include ________. Group of answer choices helium carbon dioxide water vapor sulfur dioxide or hydrogen sulfide
Answer:
Water vapour (more than 60%)
explain why a luminous flame of a Bunsen burner produces bright yellow light
Answer:
because of the small soot particles
Answer:
is due to small soot particles in the flame which are heated to incandescence or the shortage of combustion air .
2Ag(s) + S(s) -> Ag2S(s)
If we used 0.7 moles Ag and 0.312 moles S, would Ag be the limiting reactant?
Answer:
Sulphur
Explanation:
Sulphur because we been 2 ag for 1 s therefore 0.312 S will need 0.624 of Ag
Ag is not the limiting reactant in this case. The limiting reactant is determined by the reactant that is completely consumed first, and in this case, it is S.
To determine the limiting reactant, we need to compare the moles of each reactant to the stoichiometric ratio of the balanced equation. The balanced equation for the reaction is:
2Ag(s) + S(s) →Ag₂S(s)
According to the balanced equation, the stoichiometric ratio between Ag and S is 2:1. This means that 2 moles of Ag react with 1 mole of S to produce 1 mole of Ag₂S.
Given:
Moles of Ag = 0.7 moles
Moles of S = 0.312 moles
To determine if Ag is the limiting reactant, we need to compare the moles of Ag to the stoichiometric ratio.
Moles of Ag / Stoichiometric coefficient of Ag = 0.7 moles / 2 = 0.35 moles
Comparing this value to the moles of S, we can see that 0.35 moles of Ag is less than 0.312 moles of S. Therefore, Ag is not the limiting reactant in this case. The limiting reactant is determined by the reactant that is completely consumed first, and in this case, it is S.
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4.
Which series is in order of increasing boiling point?
A. CH2CH2CH3OH CH3COCH3 CH3CH2CH3
B. CH3CH2CH3 CH3COCH3 CH2CH2CH3OH
C. CH3COCH3 CH2CH2CH3OH CH3CH2CH3
D. CH3CH2CH3 CH2CH2CH3OH CH3COCH3
The series which is in order of increasing boiling point is CH3CH2CH3 CH3COCH3 CH2CH2CH3OH
However, the boiling point of an organic substance is the temperature at which the vapor pressure of the liquid organic substance equals the pressure surrounding the liquid and the liquid changes into a vapor.
What are organic compounds?Organic compounds are substance containing carbon and hydrogen. Some few organic compounds include:
AlkanesAlkenesAlkynesAlkanolsAlkanalsAlkanonesEstersAminesSo therefore, the series which is in order of increasing boiling point is CH3CH2CH3 CH3COCH3 CH2CH2CH3OH
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A gas has a pressure of 100 kPa, a volume of 43.2 mL at a temperature of 19 C. What will be is volume is the pressure is changed to 101.3 kPa at 0 C?
Answer:
100=43.2
101.3=x
100x=101.3×43.2
100x=4376.16
x=4376.16/100
x=43.7616
A chemist makes a solution of naoh for use in an experiment. she dissolves 0.00500 mol naoh in 1.00 l h2o. the naoh completely dissociates to form a solution with [oh− ] = 0.00500 m. what is the poh of this solution? 0.00500 5.00 2.30 –2.30
-2.30 is the pOH of the NaOH solution.
How pOH is calculated?pOH of any solution is define as the negative logarithm of the concentration of OH⁻ ion present in the solution, and it is represented as:
pOH = -log[OH⁻]
In the question it is given that solution is made from NaOH and NaOH is completely dissociate in the solution. So, the concentration of OH⁻ ion is equal to the concentration of NaOH.
Concentration of NaOH will be calculated in the terms of molarity as:
M = n/V, where
n = moles of NaOH = 0.005 mole
V = volume of NaOH = 1 L
M = 0.005/1 = 0.005 M
So, concentration of OH⁻ ion = 0.005 M
Value of pOH will be calculated as:
pOH = -log(0.005) = -2.30.
Hence, option (4) is correct i.e. -2.30.
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Answer:
The answer is c
Explanation:
2.30
Pls help me im drowned !!!
Hydrochloric acid isa acid so color is red .
#2
Here is the balanced equation
[tex]\\ \rm\Rrightarrow Na_2CO_3+2HCl\longrightarrow 2NaCl+H_2CO_3[/tex]
1 mol Na_2CO_3 takes 2mol HCL
16.2cm^3=0.016L1mol is 22.4L
moles of Na_2CO_3:-
0.016(22.4)=0.36molMoles of HCl=0.36(2)=0.72mol
Calcium hydroxide and phosphoric acid react to form calcium phosphate and
water
Answer:
if you are asking for the chemical reaction:
Ca(OH)2 + H3PO4-------> Ca3(PO4)2 + H2O
Explanation:
In this reaction, phosphoric acid, H3PO4 , a weak acid, will react with calcium hydroxide, Ca(OH)2 , a strong base, to produce calcium phosphate, Ca3(PO4)2 , an insoluble salt, and water.
The chemical equation below shows the burning of magnesium (mg) with oxygen (o2) to form magnesium oxide (mgo). 2mg o2 right arrow. 2mgo the molar mass of o2 is 32.0 g/mol. what mass, in grams, of o2 is required to react completely with 4.00 mol of mg? 2.00 grams 64.0 grams 128 grams 256 grams
Explanation:
64 grams of O_2O2 will be required to react completely with 4 moles of Mg.
As per the balanced chemical equation 2 moles or 48 g of Mg reacts with one mole or 32 g of oxygen. Hence, 4 moles of Mg requires 2 moles or 64 grams of oxygen gas.
What is magnesium oxide ?Magnesium oxide (MgO) is a white solid mineral that occurs naturally as the mineral periclase. It is one of the most common and important magnesium compounds, and is widely used in many industrial and commercial applications.
The balanced chemical equation of the reaction between Mg and oxygen is given as follows:
2 Mg + O₂ ⇒ 2 MgO
As per the balanced chemical equation 2 moles or 48 g of Mg reacts with one mole or 32 g of oxygen. Hence, 4 moles of Mg requires 2 moles or 64 grams of oxygen gas.
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two lamps (with a resistance of 10 Ohms each) are connected in a series circuit and are supplied with 100- volts of power. which of the following statements are true of the voltage that each lamp receives
a. Each lamp will recieve 50 volts
B. Each lamp will recieve 100 volts
C. The first lamp will recieve more voltage than the second lamp
Answer:
A
Explanation:
Each lamp has the same resistance of 10 ohms thus the voltage drop will be equal. In a series circuit, the Current, (I) is the same because it does not divide anywhere thus Voltage will vary with resistance.
The two lamps (with a resistance of 10 Ohms each) are connected in a series circuit and are supplied with 100- volts of power. The statements are true if the voltage that each lamp receives is each lamp will receive 50 volts. Therefore, option A is correct.
What do you mean by resistance ?The term resistance is defined as a measure of the opposition to current flow in an electrical circuit. Resistance is quantified in ohms, symbolized by the Greek letter omega (Ω).
Electric current relates to the flow of electrons. An easier way to state resistance is to consider an example of a person in a crowded market struggling to go from one shop to another.
Every lamp has the same resistance of 10 ohms thus the voltage drop will be the same. In a series circuit, the Current, (I) is the equal because it does not divide anywhere thus Voltage will vary with resistance.
Thus, option A is correct.
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Calculate the pH during the titration of 20.00 mL of 0.1000 M dimethylamine, (CH3)2NH(aq), with 0.1000 M HCl(aq) after 21.23 mL of the acid have been added.
The pH value of the solution is mathematically given as
pH=2.35
What pH value of the solution?Question Parameters:
pH during the titration of 20.00 mL of 0.1000 M dimethylamine,
with 0.1000 M HCl(aq) after 21.23 mL of the acid
Generally, the equation for the Chemical Reaction is mathematically given as
(CH3)2NH(aq), +Hcl ---> <---- (CH3)2NH2Cl(aq)
Therefore
[tex]HCl=\frac{0.186mol}{41.86}[/tex]
HCL=0.00444M
WHere
HClaq--->H+(aq)+Cl-(aq)
Hence
H+=0.00444M
pH= -log{H+}
pH=log(0.00444)
pH=2.35
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2. How many grams of water would be produced if 20.0 liters of oxygen were burned at a temperature of
-10.0"C and a pressure of 1.3 atm?
The mass of water H₂O that would be produced from the reaction is 43.2 g
How to determine the mole of oxygen Volume (V) = 20 LTemperature (T) = –10 ˚C = –10 + 273 = 263 KPressure (P) = 1.3 atmGas constant (R) = 0.0821 atm.L/Kmol Number of mole (n) =?
The number of mole can be obtained as by using the ideal gas equation as illustrated below:
n = PV / RT
n = (1.3 × 20) / (0.0821 × 263)
n = 1.2 mole
How to determine mole of waterBalanced equation
2H₂ + O₂ → 2H₂O
From the balanced equation above,
1 mole of O₂ reacted to produce 2 moles of H₂O.
Therefore,
1.2 mole of O₂ will react to produce = 1.2 × 2 = 2.4 moles of H₂O
How to determine the mass of water produced Mole of H₂O = 2.4 moles Molar mass of H₂O = (2×1) + 16 = 18 g/mol Mass of H₂O =?Mass = mole × molar mass
Mass of H₂O = 2.4 × 18
Mass of H₂O = 43.2 g
Thus, 43.2 g of water were produced from the reaction.
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Answer:
15.6g ofH2O
Explanation:
Which stimulus is an example of an internal stimulus?
A. an artificial light that attracts insects
B. an increase in the amount of water available to a plant
C. a decrease in oxygen levels in the blood during exercise
D. a sudden change of air temperature
An example of an external stimulus is a decrease in oxygen levels in the blood during exercise.
Option C
What is stimulus?A stimulus is defined as a thing or sensation that causes a specific reaction in an organ or tissue of a living organism
There are two types of stimuli:
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Answer:
An example of an external stimulus is a decrease in oxygen levels in the blood during exercise.
Option C
What is stimulus?
A stimulus is defined as a thing or sensation that causes a specific reaction in an organ or tissue of a living organism
There are two types of stimuli:
Internal stimulus
External stimulus
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Explanation:
Copper metal (Cu) reacts with silver nitrate (AgNO3) in aqueous solution to form Ag and Cu(NO3)2. The balanced chemical equation is shown below. Cu 2AgNO3 Right arrow. Cu(NO3)2 2Ag The molar mass of Cu is 63. 5 g/mol. The molar mass of Ag is 107. 9 g/mol. What mass, in grams, of Ag is produced from a reaction of 31. 75 g of Cu? 26. 95 grams 107. 9 grams 215. 91 grams 431. 82 grams.
107.9 g of Ag is produced from a reaction of 31. 75 gram of Copper.
How we calculate mass from the moles?Mass of any substance will be calculated from its moles as:
n = W/M, where
W = required mass
M= molar mas
Given chemical reaction is:
Cu + 2AgNO₃ → Cu(NO₃)₂ + 2Ag
From the stoichiometry of the reaction, it is clear that:
1 mole of Cu = produce 2 moles of Ag
Given mass of Cu = 31.75g
Molar mass of Cu = 63.5g/mol
Moles of Cu = 31.75g / 63.5g/mol = 0.5 moles
0.5 moles of Cu = produce 2×0.5 = 1 mole of Ag
Molar mass of Ag = 107.9g/mol
Required mass of Ag = 1mol × 107.9g/mol = 107.9 g
Hence, option (2) is correct i.e. 107.9 g of Ag is produced.
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2K(5) + Cl2(g) → 2KCI(S)
what type of chemical reaction is this
Answer:
Synthesis Chemical Reaction
Explanation:
A+B -> AB
If 8.63 grams of Aluminum oxide react with Nitric acid, how many grams of water will be produced?
Taking into account the reaction stoichiometry, 4.57 grams of H₂O are formed when8.63 grams of Al₂O₃ reacts with HNO₃.
Reaction stoichiometryIn first place, the balanced reaction is:
Al₂O₃ + 6 HNO₃ → 2 Al(NO₃)₃ + 3 H₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Al₂O₃: 1 mole HNO₃: 6 moles Al(NO₃)₃: 2 molesH₂O: 3 molesThe molar mass of the compounds is:
Al₂O₃: 102 g/moleHNO₃: 63 g/moleAl(NO₃)₃: 213 g/moleH₂O: 18 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
Al₂O₃: 1 mole ×102 g/mole= 102 gramsHNO₃: 6 moles ×63 g/mole= 378 gramsAl(NO₃)₃: 2 moles ×213 g/mole= 426 gramsH₂O: 3 moles ×18 g/mole= 54 gramsMass of water formedThe following rule of three can be applied: if by reaction stoichiometry 102 grams of Al₂O₃ form 54 grams of H₂O, 8.63 grams of Al₂O₃ form how much mass of H₂O?
[tex]mass H_{2} O=\frac{8.63 grams of Al_{2} O_{3} x54 grams of H_{2} O}{102 grams of Al_{2} O_{3}}[/tex]
mass of H₂O= 4.57 grams
Then, 4.57 grams of H₂O are formed when8.63 grams of Al₂O₃ reacts with HNO₃.
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Rank the following in order from the most energy released to the least energy released:________.
(a) uranium-235 splitting into two equal fragments,
(b) uranium-235 splitting into three equal fragments,
(c) uranium-235 splitting into 92 equal fragments.
Rank from most to least. To rank items as equivalent, overlap them.
A
B
C
The ranking is uranium-235 splitting into 92 equal fragments, three equal fragments, and two equal fragments. It also releases radiation.
What is nuclear fission?Nuclear fission refers to a natural chemical reaction where an atom nucleus splits into two or more fragments.
This process (nuclear fission) is well known to release huge amounts of energy and radiation.
The more will be the number of atomic fragments, the more will the energy and radiation released by the process of nuclear fission.
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The Rock Shown is Made of Light and Dark Mineral Crystals that are Evenly Distributed.
Which phrase describes the most likely
environment in which this rock formed?
A. Very High Temperature and Pressure
B. Very Low Temperature and Pressure
C. Very Low Temperature and Very High Pressure
D. Very High Temperature and Very Low Pressure
Answer:
It Is A
Explanation:
I took the test and that was the answer
Answer:
high tmp and pressure
Explanation:
At a certain temperature and pressure, 1 L of CO2 gas weighs 1.55 g. What is the mass of 1 L of N2 gas at the same temperature and pressure
Answer:Set up a proportion os V1/n1 = V2/n2. V is the volume, n is the amount in MOLES, not grams. Convert the CO_2 to moles, then solve and find that the amount of N_2 should be the same amount of moles. Then use the molar mass of N_2 (28.02 grams/mole) to convert that amount of moles into grams. That's your answer.
Explanation:
Common observations of a chemical reaction are described in the Introduction section. For each observation, name a common or everyday occurrence that must involve a chemical reaction.
Look at pic, need it asap!
Answer:
12x+4x-7y+45b+78a-44b+1a+1z+0d+1.1a+1.1a
How many atoms are present in h3po4
Answer:
3
Explanation:
The molar mass is obtained by adding up the average atomic masses of these atoms: Molar mass H3PO4 = 3(1.008 g) + 1(30.97 g) + 4(16.00 g) = 97.99 g.
Calculate the molarity of a solution that contains 0.37g CaCl2 in 340 milliliters of solution
Answer:
Your search - Calculate the molarity of a solution that contains 0.37g CaCl2 in 340 milliliters of solution - did not match any news results.
Explanation:
Diuris are common orchids found in Australia. The flowers of this species display a large number of variations in color and markings. Insects rely on the ability to learn the specific colors and markings of unfavorable flowers to avoid them in the future.
How is the variation in color and markings beneficial to the orchid plant?
From what we know, we can confirm that the variations in colors are a mechanism intended to protect the plants from predators.
Why is color a protection mechanism?This can be observed throughout nature. Many poisonous organisms have evolved bright colors intended to be noticed. Over time, this has resulted in many predators avoiding prey with bright colors, in order to avoid the possibility of being poisoned.
Therefore, we can confirm that the variations in colors are likely a mechanism intended to protect the plants from predators.
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2. True or false. The body does not digest cellulose.
True
False
9. When you move your hand from a hot stove what is the stimulus you are reacting to?
Answer:
if you touch a hot stove, the nerves in your skin shoot a message of pain to your brain. The brain then sends a message back telling the muscles in your hand to pull away.
Explanation:
Runoff from agricultural land carries chemicals from fertilizers that collect in a lake. The buildup of chemicals can eventually cause:.
Answer:
what are the roles of minerals in maintaning homeostasis?