2 Na ( s ) + 2 H2O ( l ) = 2 NaOH ( aq ) + H2 ( g )
Here's the balanced equation
Which constellation is connected with lines in the
picture?
Little Dipper
Big Dipper
Orion
Polaris
Please help me with this question
Answer:
Big dipper
Explanation:
Big dipper is one of most famous star branchIt consists of 7 bright stars The last two in a straight axis leds to another bright star.They make a spoon like shapeUsing the formula M1V1 = M2V2 , how many milliliters of a 2.50 M hydrochloric acid solution is required to make 100.0 mL of a 0.750 M solution?
30mL
1.88
300mL
333mL
Answer:
30mL is required
30ml of a 2.50 M hydrochloric acid solution is required to make 100.0 mL of a 0.750 M solution.
What is HCl?HCl is an acid which is made up of hydrogen and chlorine gas.
By the formula of dilution
M1V1 = M2V2
where V1 = 2.50 m
M2 = 100.0
V2 = 0.750 m
M1 × 2.50 m = 100.0 × 0.750 m
M1 = 30 ml
Thus, the M1 is 30 ml option a is correct.
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HNO3 ions in an aqueous solution. A forms or B. does not form
Answer:
A. forms, I used his answer and it was wrong so forms is the answer...
2. A scientist mixed two samples together: a colorless liquid that melts at 12°C and a yellow solid that melts at 390°C. She analyzed the results and found two ending substances. One of the ending substances was a gray solid. This ending substance is made up of the repeating group of atoms shown above. Which of the diagrams to the left shows the repeating groups of atoms that make up the samples the scientist mixed together?
Since a chemical reaction is said to have occured when two or more substances are chemically combined together, the starting materials must be sample 1 and 2 as shown in optionB.
What is a chemical reaction?A chemical reaction is said to have occured when two or more substances are chemically combined together. We must note that a chemical reaction produces new species that contain atoms that were present in the reactants.
Having said this much, considering the image of the product shown, the starting materials must be sample 1 and 2 as shown in optionB.
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Why is it important to balance the redox equation for the electrolysis of water?.
Electrolysis is a process, which allows us to break down a chemical compound into its elements, completing the balance by adjusting the number of atoms on both sides of the reaction is important because the number of electrons given up during oxidation must be the same as the number of electrons gained during the reduction.
What is electrolysis of water?It is a process of oxidation and reduction of one or more elements that, through the induction of electric current, breaks down the water molecule (H2O), thus producing gaseous hydrogen and oxygen.
Oxidation and reduction processes occur simultaneously and never in isolation, which is why they are called redox reactions.
Therefore, we can conclude that electrolysis is a process where electrical energy will change to chemical energy where it is important that the number of electrons given up during oxidation is the same as the number of electrons gained during reduction.
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12. Why does a water molecule have a bent shape?
A. The protons in the nucleus of the hydrogen atoms repel the protons in the nucleus of the oxygen
atom.
B. The oxygen atom has lone pairs of
electrons.
C. The hydrogen atoms repel each other.
D. It has two covalent bonds.
Answer:
A water molecule consists of two hydrogen atoms bonded to an oxygen atom, and its overall structure is bent. This is because the oxygen atom, in addition to forming bonds with the hydrogen atoms, also carries two pairs of unshared electrons. All of the electron pairs—shared and unshared—repel each other.
Explanation:
What is Ivan Pavlov most known for?
Answers may vary: His experiment in which he trained dogs to salivate at the sound of a bell
Ivan Pavlov is most known for demonstrating conditioned lreflex in dogs.
what is conditioned reflex?Conditioned reflex is a reflex action which has been conditioned to occur even without the stimulus which produces the reflex.
Ivan Pavlov is known to demonstrate conditioned reflex in dogs.
In his experiment, he trained dogs to salivate at the sound of a bell even if food which is the stimulus that produces salvation was not present.
Learn more about conditioned reflex at: https://brainly.com/question/24968947
Answer:
A conditioned reflex is a reflex action that has been trained to occur even when the stimulus that causes the reflex is not present.
Ivan Pavlov is recognized for using dogs to illustrate conditioned reflexes.
He trained dogs to salivate at the sound of a bell even when food, the stimulus that induces salvation, was not present in his experiment.
Explanation:
What property of air makes it possible to surf on the air?
Answer:
yeah if enough pressure or force is added
What is the name of the compound with the chemical formula Br2F8?
The name of the compound with the chemical formula Br2F8 is dibromo octafluorine.
How chemical compounds are named?The chemical formula of a compound shows the type and proportion of each element that makes up the chemical compound.
According to this question, a compound with chemical formula Br2F8 is given. The compound consists of the following:
2 atoms of Bromine8 atoms of fluorineTherefore, the name of the compound with the chemical formula Br2F8 is dibromo octafluorine.
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a maximum a person on earth can lift is about 270kg. On mars a person could lift is about 440kg. Explain why?
The discrepancy in how much a person can lift on Earth and in Mars is due to the difference in the acceleration due to gravity in both planets.
Dependence of Weight on the Acceleration due to GravityAlthough, the physical Quantity, mass is always constant as it is a measure of the quantity of matter in a body. The weight on the other hand is a function of the acceleration due to gravity and hence is different in different planets.
On this note, it follows that a person can carry 270kg mass on earth and 440kg mass on Mars.
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The reason an increase in substrate concentration does not increase the reaction rate indefinitely is because
Answer:
Increasing substrate concentration also increases the rate of reaction to a certain point. Once all of the enzymes have bound, any substrate increase will have no effect on the rate of reaction, as the available enzymes will be saturated and working at their maximum rate.
16. Write a two-column proof. (4 points)
Given: Ty = 8x – 14: y = 6
Prove: x=7
Answer:
To me a two column proof is usually associated with Euclidean Geometry.
To use it here in this rather simplistic problem is like using a sledge hammer to drive in a finishing nail ...
here is what I would do
7y=8x-14; y=6
then:
42 = 8x - 14
56 = 8x
x = 56/8 = 7
There! I have proven it.
Explanation:
If 8.25 grams of lead II nitrate reacts, how many grans of sodium nitrate is produced?
Please help me with 17 & 18!!
Thankss in advance!! :)
#17
#a
Group 15 elements have valency 3
B,Al are the answers#b
Oxygen is more reactiveLet's check the EC of both
[tex]\\ \rm\Rrightarrow [O]=1s^22s^22p^4[/tex]
[tex]\\ \rm\Rrightarrow [S]=[Ne]3s^23p^4[/tex]
Oxygen is smaller in size Hence more electronegative.#c
Decrease in size
Farther we go in a period more electrons are added to the atom .So nuclear charge increases and atomic radius decreases#18
#a
HNO_3#b
Nitric acid is a acid so methyl orange turns red#c
Used as oxidising agentwhich of these does an open office or microsoft office wizard do?
Answer:
C. guides you through the steps to complete a complex task.
Explanation:
mark me brainliest!!
Calculate the percent composition of hydrogen in C8H9NO2.
Answer:
72.72%
Explanation:
What is the enthalpy of reaction for the decomposition of NO2(g)? 2NO2(g) Right arrow. N2(g) 2O2(g) kJ This reaction is.
Answer:
The reaction is: -67.68
Explanation:
hope this helped:)
A blue fish and a yellow fish mate and have green offspring. What type of inheritance is this an example of?
The type of inheritance displayed by the illustration is incomplete dominance.
Incomplete dominanceIt is a kind of inheritance in which one of the two alleles of a gene exerts incomplete influence on the other allele.
For example, a cross of white and red flower plants yielding a plant with pink flowers. It means that the dominance of the red or pink allele is incomplete.
The same is applicable to a blue fish mating with a yellow fish to produce green offspring. A blend of the two colors occurred.
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Compare the location of bonding electrons in a polar covalent bond with those in a nonpolar covalent bond!!?????!????? I NEED HELPPPP
Answer:
A polar covalent bond will have the electrons shifted more towards one side or the other; a nonpolar bond will have evenly distributed electrons.
Explanation:
The basis for a polar bond is that the electrons are shared unevenly. Some elements are more electronegative than others; that is, they pull harder on the electrons and tend to have more electrons around them. Following the periodic trends, Fluorine is the most electronegative element, so it will likely have the most dense area of electrons in a molecule. All this means that in a polar molecule, the electrons will be spread out unevenly along the lengths of the bonds as some elements will pull on them more than others will.
Nonpolar molecules do not have to worry about differences in electronegativity, and so the electron density will be pretty evenly distributed along the entire molecule.
Hope this helps! :)
How will you separate a solution of benzene and chloroform?
Answer:
[tex]\huge\boxed{\sf Distillation}[/tex]
Explanation:
State of benzene at RTP = liquidState of chloroform at RTP = liquidBoiling point of benzene = 80.1 °CBoiling point of chloroform = 61.2 °CSince, both of the chemicals are liquids, we can separate it by the process of distillation.
Distillation:
is the process in which we separate two liquids on the basis of their difference in boiling points.How it works:
Since chloroform has less boiling point, it will evaporate and collected first and benzene will follow it after sometime.
- Apparatus of distillation is in the attached file.
[tex]\rule[225]{225}{2}[/tex]
Arctic foxes have adapted to the tundra cycles by turning white in the wintertime. Which other tundra animal has adapted the same way?
black flies
wild musk ox
willow ptarmigan
grey wolf
Similar to Arctic foxes, the Grey wolves fur turn white in winter as a form of adaptation to enable to avoid detection by prey.
What is adaptation?Adaptation refers to the special features or structures possessed by organisms which enhances their chances of survival in their environment.
Arctic foxes turn white in winter in order to avoid detection by predators as well as to be able to easily catch prey.
A similar adaptation has been observed in grey wolves whose fur turn white in winter to enable to avoid detection by prey.
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Answer:willow ptarmigan
Explanation:They change their feathers to white in the winter from red in the summer
Which of the following is a chemical properties
A Hardness
2. Metting point
C. Flatility
D. Martin
1.) Given the % composition of each element in the following compound. Calculate and determine the empirical formula. Name the formula as well.
1.6% H 22.2% N 76.2% O.
Hint, assume a 100 g sample, then you will have 1.6 g H, 22.2 g N and 76.2 g O
2. A sample of a compound is broken down into its constituent elements and yields 13.0 g of lead, 1.77 g of nitrogen and 4.03 g of oxygen. What is the empirical formula for this compound?
3.) If 4.04g of N combine with 11.46g O to produce a compound with a molar mass of 108.0 g/mol, what is the molecular formula of this compound?
1. The empirical formula of the compound is HNO₃. The name of the compound is trioxonitrate (v)
2. The empirical formula of the compound is PbN₂O₄ or Pb(NO₂)₂
3. The molecular formula of the compound is N₂O₅
1. How to determine the empirical formula Hydrogen (H) = 1.6 gNitrogen (N) = 22.2 gOxygen (O) = 76.2 gEmpirical formula =?Divide by their molar mass
H = 1.6 / 1 = 1.6
N = 22.2 / 14 = 1.586
O = 76.2 / 16 = 4.7625
Divide by the smallest
H = 1.6 / 1.586 = 1
N = 1.586 / 1.586 = 1
O = 4.7625 / 1.586 = 3
Thus, the empirical formula of the compound is HNO₃ and the name of the compound is trioxonitrate (v)
2. How to determine the empirical formula Lead (Pb) = 13 gNitrogen (N) = 1.77 gOxygen (O) = 4.03 gEmpirical formula =?Divide by their molar mass
Pb =13 / 207 = 0.0628
N = 1.77 / 14 = 0.1264
O = 4.03 / 16 = 0.2519
Divide by the smallest
Pb = 0.0628 / 0.0628 = 1
N = 0.1264 / 0.0628 = 2
O = 0.2519 / 0.0628 = 4
Thus, the empirical formula of the compound is PbN₂O₄ or Pb(NO₂)₂
3. How to determine the molecular formulaWe'll begin by determining the empirical formula of the compound. This can be obtained as follow:
Nitrogen (N) = 4.04 gOxygen (O) = 11.46 gEmpirical formula =?Divide by their molar mass
N = 4.04 / 14 = 0.2886
O = 11.46 / 16 = 0.71625
Divide by the smallest
N = 0.2886 / 0.2886 = 1
O = 0.71625 / 0.2886 = 2.5
Multiply by 2 to express in whole number
N = 1 × 2 = 2
O = 2.5 × 2 = 5
Thus, the empirical formula of the compound is N₂O₅
Finally, we shall determine the molecular formula of the compound. This can be obtained as follow:
Empirical formula = N₂O₅Molar mass of compound = 108 g/mol Molecular formula =?Molecular formula = empirical × n = molar mass
[N₂O₅]n = 108
[(2×14) + (16×5]n = 108
[28 + 80]n = 108
108n = 108
Divide both side by 108
n = 108 / 108
n = 1
Molecular formula = [N₂O₅]n
Molecular formula = [N₂O₅] × 1
Molecular formula = N₂O₅
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You have two cubes. They are the same size. They are both painted
white. One is iron, the other copper. What is the best way to determine
which is which?
You can determine which is which by weighting them
Copper usually weighs heavier than iron, so if you weigh them both on the scale, the heavier one would be the copper cube
Hope this helped!
why is earth's atmosphere located above earth's crust? A because gases in the atmosphere are warmer. Because gases in the atmosphere have no mass. C because gases in the atmosphere are less dense. D because gases in the atmosphere take up less space?
Answer: C because gases in the atmosphere are less dense
Explanation:
Explain when the term vapor should be used to describe the gas phase.
PLEASE HELP ASAP!! WILL MARK BRAINLIEST FOR CORRECT ANSWER!!
The volume of a gas is 3. 0 L, the pressure is 1. 0 atm, and the temperature is 300 K. A chemist changes one factor while keeping another constant so that the new volume is 2. 0 L. What are the new conditions?
A. The final pressure is 0. 5 atm, while temperature is kept constant.
B. The final temperature is 200 K, while pressure remains constant.
C. The final pressure is 0. 2 atm, while temperature is kept constant.
D. The final temperature is 350 K, while pressure remains constant
Answer:
letter D is the answer
Explanation:
D. The final temperature is 350 K, while pressure remains constant
Answer:350 K, while pressure remains constant
Explanation:
HNO3(aq)+H,0(1)+2NO(g) what is the total number of nitrogen atoms?
Answer:
3n+2n=5n 5 nitrogen atoms
Need help asp will give brainliest
Answer:
Explanation:
1: the sciencetific name of a giant squid is called Architeuthis
2: i dont know I think it says diet but: Giant squid mostly eat deep water fishes and other squids.
3: the range of a Giant squid can be found in oceans around the world at depths of at least 2,950 feet, but their exact range is unknown.
4, characteristics,
1: it has two large fins attached to its mantle.
2: the giant squid have many unique features, such as their ability to produce 'ink' to distract and deter predators.
3:
facts,
1: Their eyes are the largest eyes in the animal kingdom and are about 10 inches
2: Their big eyes help them to spy objects in dark depths where most other animals would see nothing
3: Until 2005, nobody had ever seen a giant squid that was alive.
4: According to the stories, an huge squid would wrap its arms around a whale, causing a terrible fight to start.
5: Giant squid have small fins at the rear of their mantles used for locomotion.
Human IMPACT
Not only can squids and octopuses sense sound, but as it turns out, these and other so-called cephalopods might be harmed by growing noise pollution in our oceans—from sources such as offshore drilling, ship motors, sonar use and pile driving.
What is a new trend in the recreational drug field?
Answer:
depressants
Explanation:
these are new to the recreational area of drugs