Answer:
atomic # 38 or strontium (Sr)
Explanation:
Which ion with a
+2charge has the electron configuration
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6?
ADD THE ELECTRONS AND ADD 2 MORE FOR THE +2 CHARGE
so
2 +2 +6 +2 +6 +2 + 10 + 6 +2
so if it is now neutral (you added 2 e's to ofsetr the +2 charge) it has 38
protons, so it is atomic # 38 or strontium (Sr)
Which scientific law describes the observation that energy cannot be created or destroyed?
Law of universal gravitation
Law of conservation of energy
Newton's first law of motion
Newton's third law of motion
Answer:
law of conservation of energy
Suppose you are performing a precipitation titration to study the K sp of zinc(II) iodate, Z n ( I O 3 ) 2 . The literature value of K sp is 3.9 × 10 − 6 . If you use 0.200 M K I O 3 as the titrant, what concentration of I O 3 − (in M) do you predict will be needed to start precipitation in a 0.229 M solution of Z n ( N O 3 ) 2 ?
The predicted concentration of IO₃⁻ needed to start the precipitation titration is 1.703 × 10⁻⁷ M
The dissociation of zinc (II) iodate can be expressed as:
[tex]\mathbf{Zn (IO_3)_2 \to Zn^{2+} + 2IO_3^-}[/tex]
Given that the solubility product constant Ksp value = 3.9 × 10⁻⁶
For the above dissociation,
[tex]\mathbf{Ksp = [Zn^{2+ }] [IO_3^-]^2}[/tex]
Since [tex]\mathbf{ [Zn^{2+ }] = [Zn(NO_3)_2] = 0.229 \ M}[/tex]
∴
[tex]\mathbf{3.9\times 10^{-8} =(0.229) \times [IO_3^-]^2}[/tex]
[tex]\mathbf{ [IO_3^-]^2 = \dfrac{3.9\times 10^{-8} }{(0.229)}}[/tex]
[tex]\mathbf{ [IO_3^-]^2 = 1.703 \times 10^{-7} \ M}[/tex]
Therefore, we can conclude that the initial predicted concentration of IO₃⁻ needed to start the precipitation titration is 1.703 × 10⁻⁷ M
Learn more about solubility product constant here:
https://brainly.com/question/17274813?referrer=searchResults
HELP
How can you tell if mass is being conserved
Can someone tell me how to calculate the percentage of purity of a sample in a compound and the percentage of the compound in the sample
Answer:
Percentage purity of a substance can be calculated by dividing the mass of the pure chemical by the total mass of the sample, and then multiplying this number by 100.
Explanation:
mark me as brainlist
What is the limiting reactant from this equation
Answer:
A Option is the correct answer.
Explanation:
please answer, the question is attached below/above
Answer: No
Explanation: O is a recessive trait so at least there is a mutation, then no.
NEED ANSWER ASAP!! will give brainlist
Which best explains why nanofiltration is an important new technology?
A. It can be used to help regions that have a short supply of usable water.
B. It can be used as an energy source to produce electricity in regions with limited coal.
C. It recycles wastewater to be reused for geothermal energy.
D. It collects solar energy to generate electrical power.
Explanation:
Our Direct Nanofiltration (dNF) membranes offer the unique combination of a low fouling hollow fiber configuration with the ability to remove organics and salinity (hardness) from water in one simple step. Other than a strainer, no further pre-treatment is required. We manufacture our membranes with a patented layer-by-layer process, where multiple nano-scale layers are deposited on a membrane support. This method enables very precise and controlled rejection and flux properties of the membrane. A unique solution for troubled water.
the farm is a place where lot's of different__________and________live.goats have________that arch backward.the horns keep them___________.
horns insects animals protected
dog's are man's best friend.dogs eat ______to keep them energetic.dogs permanent__________are ________.a dogs teeth serve as _______and as tools for ________or________food
meat cutting powerful teeth weapon tearing
Answer:
plantsanimalshornsto protect it selfkaleliving with peoplescaring itspecialbite eatExplanation:
I know it's right, because this answer is from my self and I hope it's help to us. keep learning and God bless.
HELPP PLISS :(
Achemist analyzes two samples. One sample contains 14 g of element X and 6.0 g of element Y. The second sample contains 28 g of element X and 6.0 g of element Y. Does it appear that the two samples are the same substance? Explain the reasons for your answer.
A chemist analyzes two samples. One sample contains 14 g of element X and 6.0 g of element
HELP QUICK carbon dioxide makes up less than 1 percent of earths atmosphere, and oxygen makes about about 20 % These percentages are maintained most directly by what
Answer:
respiration and photosynthesis
Explanation:
The percentages of carbon dioxide and oxygen in Earth's atmosphere are maintained most directly by cellular respiration and photosynthesis.
What is photosynthesis?Photosynthesis simply refers to a biological and chemical process through which green plants convert light energy derived from the Sun into chemical energy, so as to make their food while using carbon dioxide (CO₂) and releasing oxygen.
On the other hand, cellular respiration is a series of metabolic reactions that occur in living cells and it involves the use of oxygen that are typically produced by green plants (autotrophs) during photosynthesis.
This ultimately implies that, the percentages of carbon dioxide (1%) and oxygen (20%) that are contained in Earth's atmosphere are maintained most directly by cellular respiration and photosynthesis.
Read more on photosynthesis here: brainly.com/question/3529377
Determine the amount in grams of KCl that exists in 20.3 g of a solution that contains 1.14 % KCl by mass 1.14 g KCl
The mass of KCl that exists in 20.3 g of solution containing 1.14% by mass of KCl is 0.23 g
From the question given above, the following data were obtained:
Mass of solution = 20.3 g
Percentage of KCl = 1.14% = 1.14 / 100 = 0.0114
Mass of KCl =?[tex]Percentage = \frac{mass of solute}{mass of solution} * 100\\\\0.0114 = \frac{mass of KCl}{20.3} \\\\[/tex]
Cross multiply
Mass of KCl = 0.0114 × 20.3
Mass of KCl = 0.23 gTherefore, the mass of KCl in the solution is 0.23 g
Learn more: https://brainly.com/question/14876861
two reactants are placed into a flask a single displacement reaction occurs, with general reaction of scheme of:
Given that a single-displacement reaction occurred between two (2) reactants which were placed into a flask, the potential identities of A, B, and X are: D. A = Mg, B = O, X = Cl.
A single-displacement reaction is also referred to as a single-replacement reaction and it can be defined as a type of chemical reaction wherein a single (one) chemical element of the reacting chemical compound is displaced (replaced) by a similar chemical element.
This ultimately implies that, a single-displacement reaction typically involves a single element displacing another chemical element within a chemical compound.
Note: A potential identity reveals the chemical symbol or name of a chemical element in a particular chemical reaction.
Given the following general reaction of scheme of:
[tex]2AB+2X_2\rightarrow 2AX_2+B_2[/tex]
We would proceed to replace the variables with chemical elements as follows:
[tex]2MgO+2Cl_2\rightarrow 2MgCl_2+O_2[/tex]
Therefore, the potential identities of A, B, and X are:
[tex]A = Mg\\\\B = O\\\\X = Cl[/tex]
Read more: https://brainly.com/question/25670663
PS: Your question is lacking the necessary information, but I have provided them in the image attached.
Usain Bolt went from 0.0 to
11.0m/s in 3.4s. What was his
acceleration?
Answer:
Answer: Change in speed = 11 m/sTime taken = 3.4sHence, acceleration = (11/3.4) m/s² = 3.235 m/s²
Explanation:
(winks and runs off)
Acceleration is 3.235 m/s² when Usain Bolt went from 0.0 to 11.0 m/s in 3.4 seconds.
What is acceleration?
Acceleration is defined as a rate at which the velocity changes with time with respect to both speed and direction.An object is said to be accelerated if it's speeds up r slows down.
Motion along a circle is always accelerated even when speed is constant it's direction is continuously changing.Acceleration is a vector quantity as it has both magnitude as well as direction.The magnitude of acceleration is described by Newton's second law of motion.
Formula of acceleration is change in speed /time.Substituting the given values in the given formula,(11.0-0.0)/3.4=3.235 m/s².
Thus, the acceleration is 3.235 m/s² when Usain Bolt went from 0.0 to 11.0 m/s in 3.4 seconds.
Learn more about acceleration,here:
https://brainly.com/question/12550364
#SPJ2
I need this done soon!
What is a saturated solution?
A. A solution with as much dissolved solute as it can hold at a given temperature.
B. A heated solution with more dissolved solute can hold at a lower temperature.
C. A solution that holds less dissolved solute than is possible at a given temperature.
D. A solution that holds as much solvent as possible at all temperatures.
Answer: A
Explanation:
A saturated solution is a chemical solution that contains the highest bound solvent level. In a saturated solution, the extra solution will not dissolve. Depending on a multitude of variables, the quantity of fluid that can we can add in a solvent to create a saturated solution.
Indicate the general type of reaction represented in each the reactions: The starting material is a 6 membered ring with an internal alkene between carbons 1 and 2. The product is a six membered ring with a bond to X on carbon 1 and a bond to Y on carbon 2. What type of reaction is Reaction A
The reaction as described is an addition reaction in which a saturated product is obtained.
The information we have from the question is that; the starting material is a 6 membered ring with an internal alkene between carbons 1 and 2. The product is a six membered ring with a bond to X on carbon 1 and a bond to Y on carbon 2.
We know that an addition reaction is one in which a molecule is added across the double bond to yield a saturated product. The reaction A described has to do with he addition of a molecule XY to a six member alkene to obtain the saturated product as described.
Learn more: https://brainly.com/question/2510654
Elements that form diatomic molecules include
a oxygen
b hydrogen
C sodium
d two of the above
Answer:
D, two of the above, oxygen and hydrogen.
Explanation:
To solve this problem we can either use orbital stuff or common knowledge. Oxygen and hydrogen are known to form O2 and H2, while sodium forms metallic bonds between the atoms.
Which of the following is an example of climate?
A. The polar regions have long winters and short, cool summers.
B. Humidity levels are high today.
C. Canada experienced an unusually warm summer this year.
D. Tornados formed across Oklahoma yesterday.
Answer:
A. The polar regions have long winters and short, cool summers.
Explanation:
Climate is location based, however is over long periods of time, so Canada would not be considered because it is only 1 summer
How many total atoms of Nitrogen are shown in the formula below?
formula in question: 4N20
awnsers for problem
A.2
B.4
C.6
D.8
includes photo
Giveing 50 brainlys to the right awnser
The number of atoms of nitrogen in 4N₂O is 8 atoms.
Atom are the basic or fundamental units of matter that defines its structure.
The atom housed the proton, neutron and electron. The atoms of nitrogen in 4 moles of the Nitrogen oxide is the number of each nitrogen present in it .
Therefore,
4N₂O → Number of atoms of Nitrogen will be 4 × 2 = 8 atoms.
Therefore, the number of atoms of nitrogen in the compound 4N₂O is 8.
read more: https://brainly.com/question/18777500?referrer=searchResults
Observe the superscript of N
It's 2Means
There is 2 atoms of N in 1 molecule of Nitric oxideNow as there is 4 multiplied
Total atoms=4(2)=8Consider the unbalanced chemical equation:
H2SO4 (aq) + Fe(OH)3 (S) → Fe2(SO4)3 (S) + H2O (L)
A volume of 38.0 mL of aqueous H2SO4 solution was required to
react completely with 0.685 g Fe(OH)3 (molar mass = 106.8 g/mol)
to produce Fe2(SO4)3. Calculate the molar concentration of the
H2SO4 solution.
A) 0.253 M
B) 0.344 M
C) 0.214 M
D) 0.301 M
E) 0.175 M
The answer is A. The explanation is in the image.
On the top of the image where it just says equation:, that is part of the sentence "First we need to balance the equation:"
Explain how signals are processed and stored by the brain.
[tex] \: \: \: \: [/tex]
Neurons communicate with each other by sending chemical and electrical signals. Each neuron is connected with other neurons across tiny junctions called “synapses”. Impulses rush along tiny fibres, like electrical wires, from one neuron to the next. Electrical impulses travel through neuronshope it helps[tex] \: \: \: \: \: \: \: [/tex]
Which of the sequence best describe how a piece of chicken nugget is digested in the human body?
mouth, esophagus, small intestine, large intestine, stomach
mouth, esophagus, small intestine, large intestine, stomach
mouth, stomach, small intestine, large intestine, esophagus
mouth, stomach, small intestine, large intestine, esophagus
mouth, esophagus, stomach, small intestine, large intestine
mouth, esophagus, stomach, small intestine, large intestine
None of the above
The sequence for the disgestion of a piece of chicken nugget in the human body is: C. mouth, esophagus, stomach, small intestine, large intestine.
What is digestion?Digestion can be defined as a form of catabolic activity that involves the breaking down of food into smaller sizes that can be absorbed as nutrients by the body of a living organism while releasing energy through the process.
Based on the digestive system, the sequence for the disgestion of a piece of chicken nugget in the human body are:
MouthEsophagusStomachSmall intestineLarge intestineRead more on disgestion here: https://brainly.com/question/22686081
Photosynthesis is an endothermic chemical reaction that forms sugars from carbon
dioxide, water, and the sun's energy. Which of the following must be true of
photosynthesis?
The reaction can take place only if energy is added.
The reactants are oxidized.
The photosynthesis reaction produces ions.
The molecular bonds in carbon dioxide are very weak.
Answer:
The reaction can take place only if energy is added.
need help with this pleaseeeee
Answer:
1) 1, 1
3)1, 1
4) 1, 2
5) 2, 1
6) 1, 5
7) 2, 5
What other inventions came because of the microscope? (These are inventions that are related to the microscope in some way.)
Answer:
Explanation:Leeuwenhoek observed animal and plant tissue, human sperm and blood cells, minerals, fossils, and many other things that had never been seen before on a microscopic scale. He presented his findings to the Royal Society in London, where Robert Hooke was also making remarkable discoveries with a microscope.
A student performs titration to find the concentration of acetic acid. Titrant was sodium hydroxide. He went beyond the indicator color change by adding too much titrant. How will his experimental error affect the calculated value for the concentration of unknown acetic acid
Answer:
A student performed titration to find the concentration of acetic acid. Titrant was sodium hydroxide. He went beyond the indicator color change by adding too much titrant.
Explanation:
hope it helps you
14. What type of materials are spun together to make yarns?
Answer:
cotton
Explanation:
which is typically spun into fine yarn for mechanical weaving or knitting into cloth.
Identify three ways you could increase the rate of an aspirin tablet dissolving in a glass of water.
Answer:
If you are trying to dissolve a substance, you have three primary avenues to increase the dissolution rate: decreasing the particle size of the solid, increasing the temperature and/or increasing the mixing or stirring rate.
Explanation:
When the concentration of SO2(g) is increased to 1.48 M, the ratio of products to reactants is 1.4. The equilibrium constant for the reaction is 14. In which direction will the reaction shift to regain equilibrium
Answer:
Towards the products
Explanation:
The equilibrium constant for the reaction is 14. The equilibrium will shift towards the product.
What is equilibrium?Equilibrium is defined as a condition in which the forward and backward reaction rates are identical. When all of the external forces acting on an object are balanced, the object is said to be in equilibrium in a reference coordinate system. This indicates that all external forces and moments acting on this item have a net effect of zero.
When sulfur dioxide SO2 concentration is increased, the Q value rises to 1.4.
Q = [ SO₃ ]² / [ SO₂ ]² [ O₂ ]
Q = 1.4
Where K
K = [ SO₃ ]² / [ SO₂ ]² [ O₂ ]
K = 14
Q will shift to the right to consume the extra SO2 and restore the equilibrium position since Q is less than K.
Thus, the equilibrium constant for the reaction is 14. The equilibrium will shift towards the product.
To learn more about equilibrium, refer to the link below:
https://brainly.com/question/28527601
#SPJ5
What is the mass of sulphate ions 96.06 in 25.0ml of a 0.125 solution
Answer:
12.34
Explanation:
because this is how we do this
How many moles of O₂ would be required to generate 13.0 mol of NO₂ in the reaction below assuming the reaction has only 80.0% yield?
Answer:
Chemical reaction:
2 NO (g) + O₂ (g) → 2 NO₂ (g)2 moles of NO₂ is produced from O₂ moles = 1
Therefore, 2 moles of NO₂ is produced from O₂ moles = [tex]\dfrac{1}{2} \times 13 = \bf{6.5 mol}[/tex]
For 80 % yield no. of moles of O₂ = 6.5 mol
Then for 100% yield no. of moles of O₂ =[tex] \dfrac{6.5}{80\%} =\dfrac{6.5}{\frac{80}{100}} =\dfrac{6.5}{80} \times 100 = \dfrac{650}{80} = \bf 8.125\;mol [/tex]