Answer:
c. Both i & ii
Explanation:
Moles do not change with temperature hence Mole fraction does not depends of temperature.
Molality is number of moles of solutes per kilogram of solvent. It has no relationship with temperature.
This means both of them do not change wit the change in temperature.
Correct option;
c. Both i & ii
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:
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.
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.
To know more about artificial selection, here:
https://brainly.com/question/21618199
#SPJ2
How do CFC’s illustrate that technical advances can be a “double-edged” sword?
Answer:
CFC’s illustrate that technical advances can be a “double-edged” sword as CFC's were made for the advantages but soon or later it came as a disadvantage for environment.
CFC's was discovered with many advantages such as they are stable, non-corrosive, and replacement of harmful ammonia used in refrigerators and air conditioning systems. But soon it is also discovered that CFC's are destroying the upper atmosphere layer called ozone, which is a very big disadvantage for us. CFCs are major contributor to global warming after carbon dioxide.
Hence, it proves that CFC’s shows how technological advancement can be “double-edged” sword.
Please help me!! If you do thank you
Answer:
True
Explanation:
.
What is the term for electrons that are not held within a bond?
Answer:
lone pairs. pairs of valence electrons that are not involved in covalent bond formation, unshared pairs of electrons.
Explanation:
what are the roles of the mucous select two options PLEASE HELP
Answer:
The answer is A and C
Please help meee thank uou!!!
which electrons in an atom have the highest energy level
What is a measurement of the electromagnetic field’s alignment?
Answer:
Explanation:
Magnetic fields can be measured in various ways. If this device, called a dip meter, is first aligned in the direction of the magnetic meridian as defined by a compass, the needle lines up with the total field vector and measures the inclination angle I
Practice working with numbers that have exponents. In the blank provided, write greater than, less than, or equals.
a. 10–2 ____________________ 10–3
b. 10–14 ____________________ 101
c. 10–7 ____________________ 0.0000001
d. 100 ____________________ 101
Answer:
a. 10⁻² > 10⁻³
b. 10⁻¹⁴ < 10¹
c. 10⁻⁷ = 0.0000001
d. 100 > 10¹
Explanation:
a. 10⁻² > 10⁻³We can rewrite those numbers as 0.01 and 0.001. That way the answer becomes clearer.
b. 10⁻¹⁴ < 10¹Any positive number with a negative exponent will be less than 1.
c. 10⁻⁷ = 0.0000001In the decimal, the 1 is exactly 6 zeros away from the dot, meaning the 1 is in the seventh place.
d. 100 > 10¹10¹ is equal to 10.
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
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.
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
help me pleaseeeeeeeeeeeeeeeeeeeeeeeeee
Answer: nitrogen
Explanation:
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
What is always conserved in both physical and chemical changes, explain?
Turgor pressure can help plants move. Internal water pressure can cause -
If you throw a basketball to a friend while you are sitting or standing on a skateboard, what will happen to you when you throw the ball?
Answer:
You will more than likely fall or get pushed back a little
Explanation:
Answer
Depends on if you're good on a skateboard or not.
Explanation:
If you're good: Then you wont fall
If you're bad: Then you might fall
Can't tell if this is an actual school question or not, lol
But I hope it helps, :)
If you have 15g of sodium carbonate, what
mass of sodium is present in that sample?
Answer: 6.75 g
Explanation:
What would the name of the following compound be:
Answer:
ammonium phosphite
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
Combining hydrogen and oxygen to make water is a physical change
id say physical cause your changing the physical form of the molucles
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 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
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 moles are in 6.31x10^24 C atoms
Answer:
Explanation:
1 mol of any chemical is 6.02 * 10^23
x mol of any chemical is 6.31 * 10^24
You should look at this before you put it in your calculator. You should think roughly 10.
Now you can set it up as a proportion
1/x = 6.02 * 10^23/6.31 * 10^24 Cross multiply
6.02 * 10^23 x = 1 * 6.31 * 10^24 Divide by 6.02 * 10^23
x = 6.31 * 10^24 / 6.02 * 10^23
x = 10.48 mols.
Could someone please help me? You can ignore number 3
For Number 2)
THE ELEMENTS TEND TO FORM COMPOUNDS BECAUSE AOMS ARE UNSTABLE AND CAN SHARE ELECTRONS IN THIER OUTER ENERGY LEVELS .
AS WE KNOW, ATOMS OF AN ELEMENT BECOMES MORE STABLE BY LOSING , GAINING AND SHARING ELECTRONS.
Elements react with each other to complete their octet or duplet so as to become stavle in nature. For e.g. Carbon reacts with oxygen to form carbon dioxide. Carbon reacts with four molecules of hydrogen to form methane - CH4.
1.) What is the maximum number of grams of liquid water at 10C that can be heated to
30C by the addition of 84 joules of heat?
Answer:
m = 1 gram
Explanation:
Given that,
Heat, Q = 84 J
The temperature increases from 10°C to 30°C.
We need to find maximum number of grams of liquid water. We know that the heat required is given by :
[tex]Q=mc\Delta T[/tex]
c is specific heat of water, c = 4,200 J/kg°C
Use the above formula to find m. So,
[tex]m=\dfrac{Q}{c\Delta T}\\\\m=\dfrac{84}{4,200\times (30-10)}\\\\m=0.001\ kg[/tex]
or
m = 1 gram
So, the required mass is 1 gram.
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)