Question 14 of 30
Which of the following elements has 1 valence electron?
The Periodic Table
A. Sodium (Na)
B. Chlorine (CI)
C. Calcium (Ca)
D. Helium (He)
SUBMIT
Answers
Answer:
A. Sodium (Na)
Explanation:
The total number of electrons in the outermost principal energy level of an element is called the valence electrons of that element.
Na (11)---→1s2 2s2 2p6 3s1
There 1 electron in the outermost principal energy level of Sodium. So, the number of valence electron of Sodium is 11.
Answer:
Na
Explanation:
I was learning about it recently, that dude's right, it's Sodium
Related Questions
What is Photosynthesis?
Answers
Answer:
Photosynthesis is the process by which green plants and certain other organisms transform light energy into chemical energy. During photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds.
Photosynthesis is a process by which plants and other organisms, such as algae, convert solar energy into chemical energy and use it to produce organic molecules. Photosynthesis is the main source of energy in the biosphere.
Which of the following is not a compound? HCl Cl2 NaCI CO2
Answers
Answer:
CO2 it is an element.
Hope it helps:)
Why do scientists use scientific notation? A. It provides an easier way to write the element names. B. It provides an easier way to write chemical formulas. C. It provides an easier way to write scientific words. D. It provides an easier way to write very large and very small numbers.
Answers
Answer:
D
Explanation:
Scientists will use a scientific notation because, it provides the easier way to write a very large and very small numbers. Option D is correct.
Scientists use scientific notation to express numbers that are extremely large or small. Scientific notation allows for a more concise representation of these numbers by expressing them as a product of a coefficient and a power of 10.
For very large numbers, scientific notation makes it easier to handle and compare values. It allows scientists to focus on the significant digits and the scale of the number without having to write out all the zeros. It also simplifies calculations and reduces the chance of errors when dealing with such large values.
Similarly, for very small numbers, scientific notation provides a convenient way to express values without writing out a large number of decimal places. It allows scientists to express the magnitude of the number in a concise manner and enables easier comparison and calculations with other values.
Scientific notation is widely used in scientific fields such as physics, chemistry, astronomy, and engineering, where dealing with numbers of varying magnitudes is common. It provides a standardized and efficient way to represent and work with very large and very small numbers.
Hence, D. is the correct option.
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HELPPPP pleaseeeeee!!!!
Answers
Answer:
Length=Meter
Mass=Kilogram
Time=Second
Explanation:
Si is the International System of Units and means not just the U.S metric system.
Hope this helps and Please mark as Brainliest
PLEASE HELP
Why can you not create a Punnett square to determine the height of an individual?
Answers
Answer:
Punnett squares do not provide accurate predictions on the distribution of phenotypes in offspring. ... This makes it difficult to make predictions regarding Down's syndrome since it cannot predict the prevalence of the offspring's genotypes about a population.
Explanation:
Limitations of Punnett squares as models of inheritance include the lack of information about likely variation in small samples such as individual families and the lack of information about population prevalence of parental genotypes (so no predictions can be made about population prevalence of offspring genotypes.
Why nitration of benzene is easier than that of benzene......... And how is phenol converted to TNT
Answers
Answer:
The nitration of phenol is easier than that of benzene because benzene has delocalised pie-electrons which makes it more stable than phenol.
Phenol is converted to Trinitrotoluene by adding zinc dust to remove the hydroxyl group, then reacted with Aluminium oxide followed by haloalkane.
Do you think it matters if you
report 150 grams as 150
grams or 150.0 grams? Do
they mean the same thing?
Why or why not?
Answers
Answer:
yes I do think they mean the same thing
Explanation:
150 grams and 150 grams is the same thing and adding 0 to the end of a decimal does not change its value, you could even put 150.0000000 grams and it would still be equivalent to the other numbers
_ As + _ NaOH → _Na3AsO3 + _H2
Answers
Compound
a)magnesium+carbon+oxygen
b)copper+sultry+oxygen
c)barium+nitrogen+oxygen
Answers
MgCO
In which classification of matter are the components chemically combined?
A metal
B compound
C mixture
D Metalloids
Answers
Compare the following in the three states of matter
a) inter particle space
b)inter particle force of attraction
c)particle motion
Answers
Explanation:
Anything that occupies space and has mass is called matter.
(a) Inter particle space
Solids - Atoms of a solid substance are closely packed with each other due to which there is very less or no inter particle space.Liquids - Atoms of a liquid are little loosely packed due to which there is some inter particle space.Gases - Atoms of a gas are very loosely packed due to which there is large inter particle space.(b) Inter particle force of attraction
Solids - Atoms of a solid are attached to each other by strong force of attraction.Liquids - Atoms of a liquid have slightly less force of attraction as compared to a solid substance.Gases - Atoms of a gas have Vander waal forces. Hence, there is no inter particle force of attraction between atoms of a gas.(c) Particle motion
Solids - There is low or negligible particle motion between atoms of a solid.Liquids - There is high particle motion as compared to that present in a solid.Gases - There is very high particle motion as compared to solids and liquids.Number of molecules in 16 grams of h2co3
Answers
For this one u can work out the amount of moles in h2co3 by using moles=mass/mr(of h2co3 is 52)
so 16/62=0.258moles then u use the equation
number of particle = moles × 6.02×10^23
=0.258×6.02 ×10^23
=1.55×10^23 molecules.
hope this helps
Part C
For each source of energy, describe its strengths and weaknesses with respect to the ideal source you described in part A. Do Internet research, as needed, to describe each energy source.
Question 1
Describe at least two advantages and two disadvantages of using natural gas as a source of energy.
Answers
Answer:
See explanation
Explanation:
Natural gas is mined along with crude oil in many oil wells. It has the advantage of being a cheap fossil fuels which is easily obtainable.
Generally, natural gas is the cleanest of all the fossil fuels. This means that it is the fossil fuel that least contributes to environmental pollution.
On the other hand; natural gas produces some amount of sulphur as it is burnt and mercury as particulate matter. These substances are quite dangerous to health.
Secondly, the combustion of natural gas leads to the production of the oxides of nitrogen which play a key role in the occurrence of photochemical smog.
Will give brainliest
Process name of water vapor to ice
Answers
Answer:
Deposition
this is the process of a substance changing its state from gas to solid. Solid to gas is known as sublimation
Water is a liquid and its solid form is known as ice. When the water converts from the liquid phase (that is, water) to the solid phase (that is, ice), the process is known as freezing.
Water freezes at 0 degrees Celsius at standard atmospheric pressure, while it is present as liquid water between a temperature of 0 degrees Celsius and 100 degrees Celsius. Heat is lost to the surroundings as the water freezes. The ethalapy of fusion of water or heat of fusion of water is 6 kJ/mol. That is, for freezing 1 mole of water at 0 degrees Celsius, 6 kJ of heat is lost to the surroundings or is given out. Thus, freezing is an exothermic process.
Note that freezing refers to the phase change from liquid to solid and does not involve any change in the temperature of water.
True or false:
The following equation is balanced properly: 6CO2 + 6H2O → C6H12O6 + O2
Answers
In reactants side there is 12 oxygen and in the product side there is 8 oxygen
What chemical reaction happens when water breaks down into hydrogen and oxygen
Answers
Answer:
bldg licking no-good also
Answer:
Water splitting is the chemical reaction in which water is broken down into oxygen and hydrogen: 2 H2O → 2 H2 + O. Efficient and economical water splitting would be a technological breakthrough that could underpin a hydrogen economy, based on green hydrogen.
What are the names of those?
Answers
Answer:
formula tree
Explanation:
Q.does salt make water boil at a higher temperature?
Answers
Answer:
Yes
Explanation:
The salt increases the boiling point, meaning it make water boil at a higher temperature, and it decreases the specific heat capacity, meaning it will heat up quick.
What is the volume of .750 M hydrochloride acid required to react completely with 25.00 mL of .290 M NaOH solution?
Answers
from
HCl + NaOH----> NaCl +H2O
n of acid=1
n of base=1
Molarity of acid=750M
Molarity of base=290M
volume of base=25ml
from
Va=Mb ×vb×na
Ma×nb
Va=290×25×1
750×1
Va=7250
750
Va=9.67ml
The volume of .750 M hydrochloride acid is required to react completely with 25.00 mL of .290 M NaOH solution is 9.67ml
HCl + NaOH----> NaCl +H2O
n of acid=1
n of base=1
Molarity of acid=750M
Molarity of base=290M
volume of base=25ml
Therefore,
Va=Mb ×vb×na
Ma×nb
Va=290×25×1
750×1
Va=7250
750
Hence,
Va=9.67ml
What is Hydrochloric acid?
Hydrochloric acid, also known as muriatic acid, is an aqueous solution of hydrogen chloride. It is a colorless solution with a distinctively pungent smell. It is classified as a strong acid. It is a component of the gastric acid in the digestive systems of most animal species, including humans. Hydrochloric acid is an important laboratory reagent and industrial chemical.
Learn more about Hydrochloric acid
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The atoms of which element bond to one another in chains, rings, and networks?
1.
barium
2.
carbon
3.
iodine
4.
mercury
Submit An:
Answers
Please help! I don't know how to do and want to understand
Answers
how many moles of H2 are required to make 10 moles of water?
Answers
Explanation:
10 moles h20 is required
10 moles of H₂ are required to make 10 moles of H₂O.
What is Stoichiometry ?Stoichiometry is an important concept which helps us use the balanced chemical equation to measures the amount of reactants and products.
What is Balanced Chemical equation ?A balanced chemical equation is chemical equation that has equal number of atoms on both sides of arrow that is reactant and product.
First we have to write the Balanced chemical equation
2H₂ + O₂ → 2H₂O
To produce 2 moles of water, 2 moles of hydrogen are required to produce 10 moles of water.
So,
[tex]\frac{2\ \text{moles of}\ H_2}{2\ \text{moles of}\ H_2O}[/tex] × 10 moles of H₂O
= 10 moles of hydrogen are required.
Thus, from above conclusion we can say that 10 moles of H₂ are required to make 10 moles of H₂O.
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I HAVE 5 MINUTES LEFT ON THIS TEST PLEASE HELP
Mr. Marcum is a research chemist who is testing a sample to determine its properties. He moved the sample from one container to another.
sample kept the same volume, but its shape changed. From the behavior of the sample, Mr. Marcum knows that the particles that make up
sample touch each other but are free to slide by each other. What is the state of this sample?
O
A gas
O
B.liquid
C. plasma
D. Solid
Answers
Answer:
liquid
Explanation:
the act of salt and sugar dissapering in water is called
Answers
Answer:
dissolving
Explanation:
Answer:
dissoliving
Explanation:
salt and sugar are both soluble
which of the following is a property of acids
A. they are slippery
B. They taste bitter
C. They react with oils
D. they are sour
Answers
Answer:
They are sour. =)
Explanation:
Copper(II) sulfate is an active ingredient in tree stump remover. In order to help remove
a tree that was causing foundational damage to a school, a chemistry student soaked
the roots with copper(ll) sulfate. The removed tree was later dried and used as
firewood. Assuming the copper(II) sulfate is present in the wood, what color would be
observed in the fire?
Answers
Answer:
the tree red
Explanation:
Copper (II) substances burn to produce bluish-green flames.
Flame test for copper (II)The copper (II) present in the wood will make the flame produce a bluish-green color.
This is because copper (II) compounds are known to produce flame colors that range from blue to bluish-green when tested in the laboratory.
This is because the electrons in the atoms of copper lose energy and drop to lower energy, releasing the lost energy as light in the process.
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At which of the four labeled points on the titration curve below do you expect to find the highest concentration of hydroxide
ions?
A
B
C
D
Answers
Answer:
D.
Explanation:
Hydroxide ions are produced when acid reacts with a base under a Ph value of more than 7. Hydroxide ions are negatively charged ions which are released in the aqueous solution during titration process. It a oxygen and hydrogen atom covalent bond.
How many molecules of oxygen are in the cylinder
Answers
Answer:
A gas cylinder contains exactly 15 moles of oxygen gas (02)
Lussac's Law, the pressure of a gas increases due to an increase in temperature because Group of answer choices the molecules strike the walls of the container more often. there is an increase in the number of gas particles. there is a decrease in the volume of the container. the molecules get bigger. the molecules strike the walls of the container less often. PreviousNext
Answers
Answer:
the molecules strike the walls of the container more often.
Explanation:
The pressure of a gas refers to the force per unit area exerted on the walls of container by gas molecules.
Since the average kinetic energy of gas molecules increases as the temperature of the gas increases, the molecules of the gas tend to strike the walls of the container more often as the temperature of the gas increases.
Hence, the pressure of a gas increases due to an increase in temperature because the gas molecules strike the walls of the container more often.
How many moles of oxygen gas are consumed in the production of 5.00 g of iron(III) oxide from metallic iron? 4Fe(s)+3O2(g)→2Fe2O3(g) _____ mole(s) O2
Answers
Answer:
0.0469 mol of 02.
Explanation:
The balanced equation of this reaction is given as follows:
4Fe(s) + 3O2(g) → 2Fe2O3(s)
According to this equation, 3 moles of oxygen gas (O2) is consumed to produce 2 moles of iron(III) oxide (Fe2O3).
Using the formula, mole = mass/molar mass to convert mass of Fe2O3 to mole
Molar mass of Fe2O3 = 56(2) + 16(3)
= 112 + 48
= 160g/mol
mole = 5.00 g ÷ 160g/mol
mole = 0.03125mol of Fe2O3
Since 3 moles of oxygen gas (O2) is consumed to produce 2 moles of iron(III) oxide (Fe2O3).
0.03125mol of Fe2O3 will be produced when (0.03125 × 3/2) mol of oxygen gas is consumed.
0.03125 × 3/2
0.03125 × 1.5
= 0.0469 mol of 02.