Answer:
lone pairs. pairs of valence electrons that are not involved in covalent bond formation, unshared pairs of electrons.
Explanation:
what is 20+9-10+67=?
Answer:
86
Explanation:
20 plus 9 equals 29 minus 10 equals 19 plus 67 equals 86
Answer:
86
Explanation:
20+9=29
29-10=19
19+67=86
1. How many molecules of water make up 1.00 MOLE?
I need how to solve it please.
Answer:
6.022x10^23
Explanation:
Avogrado's number proved that one mole is equal to 6.022x10^23.
Select the correct answer.
Did an oxidation-reduction reaction occur in the reaction between copper sulfate and sodium sulfide?
CuSO4 + Na2S → CuS + Na2SO4
A.
This is a redox reaction because copper gained electrons.
B.
This is a redox reaction because sodium lost electrons.
C.
This is a redox reaction because sulfur gained electrons.
D.
This is not a redox reaction because no electrons were transferred.
E.
This is not a redox reaction because oxygen did not gain electrons.
Answer:
D.
This is not a redox reaction because no electrons were transferred.
Explanation:
Because oxidation state of each element is same in reactants and products.
what are the roles of the mucous select two options PLEASE HELP
Answer:
The answer is A and C
PLEASE CAN SOMEONE PLEASE HELP ME I CAN'T DO IT :(
CaCO3 + H2SO4 __________ + H2O + CO2
Na2CO3 + __________ 2NaCl + H2O + CO2
Answer:
H2SO4 + CaCO3 → CaSO4 + H2O + CO2 - Balanced equation | Chemical Equations online!
Na2co3 HCL nacl h2o co2
This is an acid-base reaction (neutralization): Na 2CO 3 is a base, HCl is an acid. This is a gas evolution reaction, CO 2 is the formed gas.
Name an acids and a bases
Answer:
HCl for acid, NaOH for base.
Explanation:
Acids start with H.
Bases end with OH.
Please help me!! If you do thank you
Answer:
True
Explanation:
.
The same amount of energy is supplied the same mass of aluminum and lead.Which metal will increase in temperature the most
Answer:
lead
Explanation:
aluminum doesn't conduct heat
I need help knowing if chemical formulas are balanced or unbalanced I cease to understand this ;-;
Balancing Chemical Formulas is like simple mathematic systems of equations
Lets look at your second example:
H2 + Cl2 = HCl
Lets replace H with x, and Cl with y.
the equation would now be
2x + 2y = xy (now I know in math x+y does not equal xy, but bear with me)
This would not be correct. For the equation to be true, both sides must yield the same counterpart. To do this, you'd have to add a coefficient to balance out both sides.
Looking at the equation, you know you have to balance the right side, as the left side is adding two things up to getting only half value. So, we will add coefficient of "2" to xy. This means that the balanced chemical equation will now be H2 + Cl2 = 2HCl
Which location of the moon relative to the sun and earth may produce a lunar eclipse?
A) A
B) B
C) C
D) D
Answer:
Its just C
Also because its infront of the sun
How many grams are they in 2.3 X 10^24 atoms of Ag?
Answer:
[tex]\boxed {\boxed {\sf 411.9833942 \ grams \ of \ silver}}[/tex]
Explanation:
1. Convert Atoms to Moles
To convert atoms to moles, we use Avogadro's Number: 6.022*10²³. This tells us the amount of particles in 1 mole of a substance. In this case, it is atoms of silver.
[tex]\frac {6.022*10^{23} \ atoms \ Ag}{ 1 \ mol \ Ag}[/tex]
Multiply by the given number of atoms.
[tex]2.3 *10^{24} \ atoms \ Ag*\frac {6.022*10^{23} \ atoms \ Ag}{ 1 \ mol \ Ag}[/tex]
Flip the fractions so the atoms of silver cancel.
[tex]2.3 *10^{24} \ atoms \ Ag*\frac {1 \ mol \ Ag}{ 6.022*10^{23} \ atoms \ Ag}[/tex]
[tex]2.3 *10^{24} *\frac {1 \ mol \ Ag}{ 6.022*10^{23}}[/tex]
[tex]\frac {2.3 *10^{24} \ mol \ Ag}{ 6.022*10^{23}} = 3.819329127 \ mol \ Ag[/tex]
2. Convert Moles to Grams
To convert from moles to grams, we use the molar mass. This can be found on the Periodic Table.
Silver (Ag): 107.868 g/molUse this as a fraction.
[tex]\frac { 107.868 \ g \ Ag}{ 1 \ mol \ Ag}[/tex]
Multiply by the number of moles we calculated. The moles of silver will cancel.
[tex]3.819329127 \ mol \ Ag * \frac { 107.868 \ g \ Ag}{ 1 \ mol \ Ag}[/tex]
[tex]3.819329127 \ * \frac { 107.868 \ g \ Ag}{ 1 }[/tex]
[tex]411.9833942 \ g \ Ag[/tex]
Please help meee thank uou!!!
help me pleaseeeeeeeeeeeeeeeeeeeeeeeeee
Answer: nitrogen
Explanation:
answers this...i gave brainlest!!
Answer:
I hope I can help
Explanation:
I hope I can help you
Question 2 (1 point)
N2 + 3H2 --> 2NH3
How many moles of N2 are needed to produce 4.5 moles of NH3?
2.25 moles
3 moles
b
4.5 moles
d
1 mole
Question 3 (1 point)
A class has compiled this list of examples of artificial selection.
• The development by dog breeders of a variety of
poodles that have different coats that do not require
brushing
The crossbreeding of cows that have provided meat and
milk for humans for many centuries
• The breeding of domestic turkeys that have large
amounts of breast meat and a reduced wing size that
makes them unable to fly
• The creation of varieties of apples that remain crisp
throughout the winter but have less flavor
• The development of roses that will wilt quickly and have
long stems, no thorns, and no strong scent
Which three statements describe the common characteristics of all of the
examples of artificial selection?
Da
Db
c.
Artificial selection always requires a detailed knowledge of the genetic makeup of a species and a familiarity with the mathematics
of inherited traits.
Artificial selection infers that a species experiences natural genetic mutation rather than reproduction planned by humans.
Artificial selection involves enhancing the natural characteristics of a species through planning and coordination of its breeding.
Artificial selection has been practiced in many forms for centuries to improve crops and livestock
Artificial selection may have unintended consequences that can reduce the benefits of a species to humans or limit its function
Do
Oe
Answer:
the answer is d
Explanation:
Artificial selection may have unintended consequences that can reduce the benefits of a species to humans or limit its function. Therefore, the correct option is option D.
What is artificial selection?Growing and rearing livestock and plants for human use was one of the greatest important milestones in the advancement of the human species. Techniques have been developed over time to increase crop yields and generate animals with the best qualities. It is known as artificial selection. These beneficial characteristics gradually take over the population.
Artificial selection refers to the selective breeding practises used by humans to select for desirable qualities in organisms and pass those traits on to their offspring. Artificial selection may have unintended consequences that can reduce the benefits of a species to humans or limit its function.
Therefore, the correct option is option D.
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Factories that produce cement account for around 5% of global emissions of carbon dioxide worldwide. Carbon dioxide is a greenhouse gas that absorbs solar radiation and rereleases it into Earth's atmosphere.
Cement production has increased over time because the demand for cement has increased. Suppose that cement production continues to increase significantly over the next 50 years. Assuming that all other factors remain the same, what impact will this most likely have on the Earth?
A Gas other than carbon dioxide will become more concentrated in the atmosphere.
B Global temperatures on Earth will increase.
C Global temperatures on Earth will decrease.
D Gases other than carbon dioxide will become depleted in the atmosphere.
Answer:
Global temperature of earth will increase
Explanation:
green house gases will trap. the heat and it will make our atmosphere warm.
The increased level of greenhouse gases increases the temperature of the earth considerably. The Global temperatures on Earth will increase as a result of it. The correct option is B.
What is greenhouse effect?The process by which the radiations from the sun are absorbed by the greenhouse gases and not reflected back into the space is defined as the greenhouse effect. This insulates the surface of the earth and prevents it from freezing.
The gases which absorb the infrared radiations and cause greenhouse effect are called the greenhouse gases. Some examples are Carbon dioxide, chlorofluorocarbons, etc.
The phenomenon of gradual increase in the average temperature of the earth's atmosphere due to green house effect is called the global warming. Due to the greenhouse effect the ozone layer of the earth's atmosphere also get depleted.
Thus the correct option is B.
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Consider the reaction below the reactivities of tertiary,secondary and primary hydrogen are 1700: 5:1 respectively. Predict the percentage yield of each of the products.
Answer:
1700: 5:1 124 123 !
Explanation:
Predict the percentage 123!
all atoms in the main group want _____ electrons in their outset shell
What is the correct chemical formula for Fe2(CO3)3?
A. iron carbonate
B. iron (II) carbonate
C. iron (III) carbonate
D. iron-carbon oxide
Combining hydrogen and oxygen to make water is a physical change
id say physical cause your changing the physical form of the molucles
Which statement describes Sparta’s strategy for the Peloponnesian War?
Sparta used its navy to attack Athens along the coastline.
Sparta ruined Athens’s farmland to try to get Athens to fight on land.
Sparta sailed around the peninsula to attack Athens from two sides.
Sparta attacked Athens directly and attempted to knock down the walls.
Answer:
it is the Sparta ruined Athens’s farmland to try to get Athens to fight on farm land
Explanation:
just did
Answer:
the answer is B
Explanation:
What would the name of the following compound be:
Answer:
ammonium phosphite
The physical part of digestion is called?
a) digestion
b) mechanical digestion
c) chemical digestion
d) solubility
Answer:
mechanical digestion is the physical part of digestion
Answer:
mechanical digestion
Explanation:
which alkaline earth metal is the components of Epsom salt
Answer:
Epsom salt is magnesium sulfate.
Alkaline earth metal, which is also sold in other products like milk of magnesia and Epsom salt magnesium sulfate and magnesium hydroxide.
What is alkaline earth metal ?The elements that make up group 2 of the current periodic table are the alkaline earth metals. Beryllium, magnesium, calcium, strontium, barium, and radium are among the elements in this group.
The physical and chemical characteristics of the elements in this group are quite similar. However, they are not often encountered in their elemental forms in nature.
Beryllium and radium are the first two elements in the second group of the periodic table, which is made up of the alkaline earth metals. They are all glossy, silvery-white metals with good reactivity, albeit not as good reactivity as the alkali metals.
Thus, alkaline earth metal is the components of Epsom salt are magnesium sulfate and magnesium hydroxide.
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How many grams of calcium phosphate does 4.1*10^25 have
Answer:
310.176722 grams
You can view more details on each measurement unit: molecular weight of Calcium Phosphate or grams The molecular formula for Calcium Phosphate is Ca3(PO4)2. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Calcium Phosphate, or 310.176722 grams.
Rank all the following elements in order of increasing electronegativity:
I, F, Br, At, CI
Answer:
At < I < Br < Cl < F
Explanation:
Electronegativity is defined as the ability of an atom to attract pair of electrons. On the periodic table, electronegativity decreases down the group and increases along the period.
The given atoms belong to the same group, so following the above rule, F has the highest electronegativity than other given atoms as it is at the top of the group and At will have the least electronegativity as it is at the bottom of the group.
Hence, the order of increasing electronegativity is
At < I < Br < Cl < F.
write accurate defination of atom.
If your answer is 100 % right then I will give you 5 star otherwise you gain 3 star.
Answer:
Atom, smallest unit into which matter can be divided without the release of electrically charged particles. It also is the smallest unit of matter that has the characteristic properties of a chemical element. As such, the atom is the basic building block of chemistry.
Explanation:
Write a detailed diagram about Mountain Vesuvius, labeling important features about it.
Answer:
Explanation:
Mount Vesuvius is considered to be one of the most dangerous volcanoes in the world because of its proximity to the city of Naples and the surrounding towns on the nearby slopes. The volcano is classed as a complex stratovolcano because its eruptions typically involve explosive eruptions as well as pyroclastic flows
What is the percent composition of nitrogen in a 2.57 g sample of Al(NO3)3?
Answer:
19.8% of Nitrogen
Explanation:
In the Al(NO₃)₃ there are:
1 atom of Al
3 atoms of N
And 9 atoms of O
The molar mass of Al(NO₃)₃ is:
1 Al * (26.98g/mol) = 26.98g/mol
3 N * (14g/mol) = 42g/mol
9 O * (16g/mol) = 144g/mol
26.98 + 42 + 144 = 212.98g/mol
We can do a conversion using these molar masses to find the mass of nitrogen is the sample, that is:
2.57g * (42g/mol / 212.98g/mol) =
0.51g N
Percent composition of nitrogen is:
0.51g N / 2.57g * 100
= 19.8% of Nitrogen