Answer:
that is a false sentence
Answer:
I'm sure you've already finished the est but the real answer is true, I took the k12 test and got that one correct, hope this helps anyone!
Explanation:
Can someone please help me and explain how to do this :')
How many moles of O₂ are needed to produce 3.17 mol of carbon monoxide from it's elements by a synthesis reaction?
Answer:
this is the answer explanation of previous question. as what you say in comment i do that
MARKING BRAINLIEST! AND 16 POINTS
Plants use energy from sunlight, water, and carbon dioxide to produce sugar. What structure is found only in plant cells and helps plants capture energy from sunlight?
Answer:
Chloroplast.
Explanation:
Answer:
chlorophat
Explanation:
Chlorine has two natural isotopes, chlorine-35 and chlorine-37.
Describe the effect these isotopes have on the relative atomic mass of chlorine
Answer:
The relative atomic mass of chlorine depends on the ratio between the abundance of these two naturally-occurring isotopes.
Explanation:
The relative atomic mass of an element is a weighted average of the atomic mass of its naturally-occurring isotopes. The relative abundance of each isotope gives its weight in this weighted average.
For these two naturally-occurring isotopes of chlorine:
The relative atomic mass of [tex]^{35}{\rm Cl}[/tex] is approximately [tex]34.969[/tex] daltons. The relative abundance of this isotope in nature is approximately [tex]0.758[/tex]. The relative atomic mass [tex]^{37}{\rm Cl}[/tex] is approximately [tex]36.966[/tex] daltons. The relative abundance of this isotope in nature is approximately [tex]0.242[/tex].[tex]\begin{array}{|c|c|c|}\cline{1-3} \text{Isotope} & \text{Atomic Mass} & \text{Relative Abundance}\\ \cline{1-3} ^{35}{\rm Cl} & \approx 34.968\; \rm Da} & \approx 0.758 \\ \cline{1-3} ^{37}{\rm Cl} & \approx 36.966\; \rm Da & \approx 0.242 \\ \cline{1-3}\end{array}[/tex].
[tex]\begin{aligned}&\text{relative atomic mass of Cl} \\ &= \text{atomic mass of $^{35}{\rm Cl}$} \times \text{relative abundance of $^{35}{\rm Cl}$} \\&\quad + \text{atomic mass of $^{37}{\rm Cl}$} \times \text{relative abundance of $^{37}{\rm Cl}$} \\ &\approx 34.968\; \rm Da \times 0.758 + 36.966\; \rm Da \times 0.242 \\ &\approx 35.45\; \rm Da \end{aligned}[/tex].
The relative abundance of [tex]^{35}{\rm Cl}[/tex] is much higher than that of [tex]^{37}{\rm Cl}[/tex]. Consequently, the relative atomic mass of the element [tex]\rm Cl[/tex] is closer to the atomic mass of [tex]^{35}{\rm Cl}\![/tex] than that of [tex]^{37}{\rm Cl}\![/tex].
At which point is kinetic energy greatest
Answer:
x is wen
Explanation:
Answer:
I would say at point ''X''
What happens to the molecules as water freezes? A. The water molecules stop moving B. The water molecules move faster C. The water molecules slow down D. The water molecules react chemically to form ice molecules
Answer:A
Explanation: A
is methane used as fule
gas true or false
Answer:
its true methane is used as a fuel gas
Explanation:
HELP ASAP!!! Which two energy transformations are shown in the photo? A. Chemical energy → electromagnetic energy B. Chemical energy → thermal energy C. Thermal energy → electrical energy D. Thermal energy → chemical energy
Answer:
Chemical energy _ thermal energy
What is the correct formula for combining Mg2+ and Br1+
Answer: The correct formula is [tex]MgBr_2[/tex]
Explanation:
For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.
Here magnesium is having an oxidation state of +2 called as [tex]Mg^{2+}[/tex] cation and bromine [tex]Br^{-}[/tex] is an anion with oxidation state of -1. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral [tex]MgBr_2[/tex].
The cations and anions being oppositely charged attract each other through strong coloumbic forces and form an ionic bond.
5) Determine the mass if lithium hydroxide that is produced when 12.87 g of lithium nitride reacts with
an excess of water according to the following process:
Li,N + 3 H2O + 3 LiOH + NH,
Answer:
Mass = 26.58 g
Explanation:
Given data:
Mass of lithium nitride = 12.87 g
Mass of lithium hydroxide produces = ?
Solution:
Chemical equation:
Li₃N + 3H₂O → 3LiOH + NH₃
Number of moles of of Li₃N:
Number of moles = mass/molar mass
Number of moles = 12.87 g/ 34.83 /mol
Number of moles = 0.37 mol
now we will compare the moles of lithium nitride with lithium hydroxide.
Li₃N : LiOH
1 : 3
0.37 : 3/1×0.37 = 1.11 mol
Mass of LiOH:
Mass = number of moles × molar mass
Mass = 1.11 mol × 23.95 g/mol
Mass = 26.58 g
How many grams of sodium is equal to 6.92 x 10 21atoms of sodium?
Answer:
[tex]Amount\ of\ Grams = 0.2644 g[/tex]
Explanation:
Given
Element: Sodium
[tex]Atoms = 6.92 * 10^{21}[/tex]
Required
Determine the amount of grams
We start by solving for the number of moles
[tex]Moles = \frac{Sodium\ Atoms}{Avogadro\ Number}[/tex]
[tex]Avogadro\ Number = 6.022 * 10^{23}[/tex]
So, we have:
[tex]Moles = \frac{6.92 * 10^{21}}{6.022 * 10^{23}}[/tex]
[tex]Moles = \frac{6.92 * 10^{21-23}}{6.022}[/tex]
[tex]Moles = \frac{6.92 * 10^{-2}}{6.022}[/tex]
[tex]Moles = 1.15 * 10^{-2}[/tex] moles
Next, we calculate the amount of grams.
Mass per mol of Sodium = 22.98977g/mol
For [tex]1.15 * 10^{-2}[/tex] moles of sodium
[tex]Amount\ of\ Grams = 1.15 * 10^{-2}\ mol * 22.98977g/mol[/tex]
[tex]Amount\ of\ Grams = 1.15 * 10^{-2} * 22.98977g[/tex]
[tex]Amount\ of\ Grams = 0.264382355 g[/tex]
[tex]Amount\ of\ Grams = 0.2644 g[/tex] (approximated)
Hence, there are 0.2644g of sodium in [tex]6.92 * 10^{21}[/tex] atoms
Which of these questions is testable in a scientific investigation?
A .Are plastics more toxic than wood when burned?B.Are mountains more beautiful than oceans?
C.Is science a better
subject to study than foreign language?
D.Does a red rose smell better than a pink rose?
Answer:
A
Explanation:
it is A because all of the other ones are opinions.
Answer:
A
Explanation:
A compound consists of 50.04% carbon, 5.59% hydrogen, and 44.37% oxygen. What is the empirical formula of this compound?
The empirical formula of the compound is C₃H₄O₂
From the question given above, the following data were obtained:
Carbon = 50.04%
Hydrogen = 5.59%
Oxygen = 44.37%
Empirical formula = ?Divide by their molar mass
C = 50.04 / 12 = 4.17
H = 5.59 / 1 = 5.59
O = 44.37 / 16 = 2.773
Divide by the smallest
C = 4.17 / 2.773 = 1.5
H = 5.59 / 2.773 = 2
O = 2.773 / 2.773 = 1
Multiply by 2 to express in whole number
C = 1.5 × 2 = 3
H = 2 × 2 = 4
O = 1 × 2 = 2
Therefore, the empirical formula of the compound is C₃H₄O₂
Learn more: https://brainly.com/question/15907539
Why do flowers have brightly-coloured petals
Answer:
Petals are modified leaves that surround the reproductive parts of flowers. They are often brightly colored or unusually shaped to attract pollinators. Together, all of the petals of a flower are called corolla.
How many joules must be added to a 1000 g iron skillet to increase its temperature
from 25°C to 250°C? The specific heat of iron is 0.449 J/gºC.
A) 449 J
B) 101,025 J
C) 50,000 J
D) 112,250 J
Answer:
B) 101,025
Explanation:
1000g * 0.449 J/g Celsius * 225 Celsius = 101,025
I got 225C from 250C - 25C
People with diabetes have to monitor and restrict their sugar intake. What volume of apple juice could
a diabetic person drink, if the person's sugar allowance for that beverage was 8.0 g? Assume that the
apple juice has a sugar concentration of 8.0 % w/v.
The volume of apple juice could a diabetic person drink : 100 ml
Further explanationGiven
sugar allowance = 8 g
sugar concentration of apple juice : 8.0% w/v
Required
Volume of apple juice
Solution
The concentration of a substance can be expressed in several quantities The concentration shows the amount of solute in a unit of the amount of solvent.
% w/v = mass of solute (weight) in g / 100 ml solution
So for 8% w/v = 8 g of sugar(solute) in 100 ml of apple juice
What historical event of commercial interest triggered investigation in the science of steam?
Answer: Photosynthesis
Explanation:
what are the difference between an animal cell and plant cell
Answer:
ANIMAL CELL
Animal cells are generally small in size.
They don't have a cell wall
Except the protozoan Euglena, no animal cell possesses plastids.
Vacuoles in animal cells are many, small and temporary.
Animal cells have a single highly complex and prominent Golgi apparatus.
Animal cells have centrosome and centrioles.
PLANT CELL
Plant cells are larger than animal cells.
The plasma membrane of plant cells is surrounded by a rigid cell wall of cellulose.
They have Plastids
Most mature plant cells have a permanent and large central sap vacuole.
Plant cells have many simpler units of Golgi apparatus, called dictyosomes.
Plant cells lack centrosome and centrioles.
Hope this helps!
Answer: Differences between animal and plant cells :
Animal cell :- Animal cells are generally small in size. Cell wall is absent. Except the protozoan Euglena, no animal cell possesses plastids. Vacuoles in animal cells are many, small and temporary. Animal cells have a single highly complex and prominent Golgi apparatus. Animal cells have centrosome and centrioles. Plant cell :- Plant cells are larger than animal cells. The plasma membrane of plant cells is surrounded by a rigid cell wall of cellulose. Plastids are present. Most mature plant cells have a permanent and large central sap vacuole. Plant cells have many simpler units of Golgi apparatus, called dictyosomes. Plant cells lack centrosome and centrioles.
Explanation:
Using the data below, calculate the enthalpy for the combustion of C to CO C(s) + O2(g)--> CO2 (g) ΔH1 = -393.5 kJ CO(g) + 1/2O2(g) -->CO2(g) ΔH2= -283.0kJ Target: C(s) + 1/2O2(g) --> CO(g) ΔH3=?? Group of answer choices
Answer:
ΔH = -110.5kJ
Explanation:
It is possible to obtain enthalpy of combustion of a particular reaction by the algebraic sum of similar reactions (Hess's law). Using:
1. C(s) + O₂(g) → CO₂(g) ΔH₁ = -393.5kJ
2. CO(g) + 1/2O₂(g) → CO₂(g) ΔH₂ = -283.0kJ
The sum of 1 -2 gives:
C(s) + O₂(g) + CO₂(g) → CO₂(g) + CO(g) + 1/2O₂(g)
C(s) + 1/2O₂(g) → CO(g) ΔH = -393.5kJ - (-283.0kJ) =
ΔH = -110.5kJBy using prefixes, we can write 32 × 10-10 kg as
Answer:
3.2 micro gram
Explanation:
because
1kg=1000g
32×10^-10kg=?
=3.2×10^-6g
1g=10^-6micro gram
3.2×10^-6g=?
=3.2 micro gram.
where g- gram
kg- kilogram
what is glycol .....
expalin with example
Answer:
glycol, any of a class of organic compounds belonging to the alcohol family; in the molecule of a glycol, two hydroxyl (―OH) groups are attached to different carbon atoms. The term is often applied to the simplest member of the class, ethylene glycol.
Explanation:
Answer:
Glycol, any of a class of organic compounds belonging to the alcohol family; in the molecule of a glycol, two hydroxyl (―OH) groups are attached to different carbon atoms. The term is often applied to the simplest member of the class, ethylene glycol.
Capture energy from sunlight and use it to produce food for the cell; perform
photosynthesis
O cell membrane
O cell wall
O Mitochondria
O chloroplasts
Answer:
The answer is option 4.
Explanation:
Chloroplast is the place where they absorb sunlight to perform photosynthesis to produce food.
his table shows the mass and volume of four different objects.
A two-column table with 4 rows. The first column titled objects has entries W, X, Y, Z. The second column titled Measurements has entries Mass: 16 grams Volume: 84 centimeters cubed in the first cell, Mass: 12 grams Volume: 5 centimeters cubed in the second cell, Mass: 4 grams Volume: 6 centimeters cubed in the third cell, Mass: 408 grams Volume: 216 centimeters cubed in the fourth cell.
Which ranks the objects from most to least dense?
X, Y, W, Z
X, Z, Y, W
W, Y, Z, X
Z, Y, X, W
Ranks the objects from most to least dense : X,Z,Y,W
Further explanationGiven
Object W : m=16 g, V=84 cm³
Object X : m=12 g, V= 5 cm³
Object Y : m=4 g, V= 6 cm³
Object Z : m=408 g g, V= 216 cm³
Required
Density
Solution
Density formula:
[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]
ρ = density
m = mass
v = volume
1. Object W
[tex]\tt \rho=\dfrac{16}{84}=0.19[/tex]
2. Object X
[tex]\tt \rho=\dfrac{12}{5}=2.4[/tex]
3. Object Y
[tex]\tt \rho=\dfrac{4}{6}=0.67[/tex]
4. Object Z
[tex]\tt \rho=\dfrac{408}{216}=1.89[/tex]
From most to least dense : X,Z,Y,W
Evaluate the carbon dioxide molecule. Explain how to determine if double or triple bonds exist in the molecule.
Answer:
It contain double Bond.
Explanation:
To determine weather the bond is double or triple simply check the electron involved in mutual sharing of an electron if 2 electron takes parts it said to be double or if 3 it said to be triple.
Questlon 7 of 10
Which object will require the greatest amount of force to change its motion?
O A. A 72 kg object moving 25 m/s
O B. A 55 kg object moving 32 m/s
OC. A 75 kg object moving 22 m/s
O D. A 63 kg object moving 27 m/s
A 72 kg object moving 25 m/s will require the greatest amount of force
Further explanationGiven
mass of object and the velocity
Required
the greatest amount of force
Solution
Newton's 2nd law :
∑F = m. a
F = force, N
m = mass = kg
a = acceleration due to gravity, m / s²
Assuming the object is moving from rest (vo = 0) and the time needed to reach its velocity is the same (delta t = equal), it can be formulated:
[tex]\tt \Sum F=m.\dfrac{v_f-v_i}{\Delta t}\\\\F=m.\dfrac{v_f}{\Delta t}[/tex]
So the force on an object depends on the product of its mass and velocity
Or if we use the impulse and momentum formula
[tex]\tt F.\Delta t=m(v_f-v_i)\\\\F,\approx m.v_f[/tex]
So that we determine which is the greatest from the multiplication of mass and velocity will produce the greatest force as well
A 72 x 25 = 1800
B. 55 x 32 =1760
C. 75 x 22 = 1650
D.63 x 27 = 1701
Option A has the greatest force
QUICK
Which of these is a ball and stick model?
The element hydrogen contains particles of
OA. water and carbon.
OB. hydrogen only.
OC. hydrogen, oxygen, and nitrogen. OD. oxygen and carbon.
Please HELP!
Answer:
B. hydrogen only.
Explanation:
The element hydrogen is a made up of only hydrogen atoms which are the particles in the element.
Hydrogen is an element. It has distinct hydrogen atoms that typifies it.
Water and carbon is not a hydrogen element. They contain hydrogen, oxygen and carbon.An element is a distinct substance that is made up of one kind of atom. The only kind of atom in element hydrogen is those hydrogen itself.
What kind of bonding would exist between
sulfur and hydrogen?
Answer:
nonpolar covalent
Explanation:
Comparing their electronegativities will help determine the type of bond. Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons. The difference in electronegativity (ΔEN) is used to determine bond type. Hydrogen has an electronegativity of 2.20 and sulfur has 2.58. The difference is 0.38,so the electrons are shared in a nonpolar covalent bond.
Explain Nuclear Fusion vs Gravity a.Gravity pushes outward and Nuclear fusion pushes inward. b.Both gravity and nuclear fusion push inward. c.Both gravity and nuclear fusion push outward. d.Nuclear fusion pushes outward, and gravity pushes inward.
Answer:
d.
Explanation:
The term known as "Nuclear Fusion" is a very important concept in chemistry and it is studied mostly under the topic or aspect of Chemistry known as or called radioactivity. Nuclear Fusion is the kind of reaction in which two or more atomic nucleus combines to for bigger ones.
There is a saying that there is no life without nuclear fusion because it is the reaction that causes the stars to have light.
Option 'd' is correct. This is what happens in stars in order for light to be produced that is the inward movement of gravity and the outward movement of nuclear fusion.
what is the specific heat of the following materials:
aluminum
water
rubbing alcohol
cooking oil
Answer:the sun
Explanation:leqjs
Let's look it up
Aluminium:-
0.89 J/kg°CWater:-
4.186J/g°CAlcohol:-
0.588cal/g°CCooking oil:-
1.67Kj/kg°C1.) Describe the two diagrams of a bottled carbonated beverage shown below as greater
pressure or lower pressure, and then as greater solubility or lower solubility. How do these two
examples illustrate the relationship between the solubility of a gas and its vapor pressure? Explain
2.) On the diagrams below, assume that each beaker contains an equal number of moles
of solute. Label each solution as concentrated or dilute. Then indicate the approximate
relative volumes of each solution by describing the surface level on each beaker.
Answer:
SEE EXPLANATION
Explanation:
If i refer to the bottle at the left hand side as A and the bottle at the right hand side as B. I can say that the bottle A contains solutes which are more soluble than the solutes in bottle B. consequently, A has a lower vapour pressure than B.
We can also see that the pressure in A is much higher than in B(as indicated by the length of the arrows). The higher the pressure, the greater the solubility of the gas. Henry's Law states that: The solubility of a gas in a liquid is directly proportional to the pressure of that gas above the surface of the solution.
Again let me call the beaker on the left A and the beaker on the right B. We can see that the beaker on the left contains 10 ml of solution while the beaker on the right contains 50 ml of solution. It follows that beaker A contains a more concentrated solution since that much amount of solute is contained in a smaller volume than in beaker B as shown in the image.
