Answer:
2
H
2
+
O
2
=
2
H
2
O
Explanation:
From the original equation, you first need to write each component separately.
H
2
+
O
2
=
H
2
O
Left side: H = 2 ; O = 2 (number based on the subscript)
Right side: H = 2 ; O = 1 (number based on the subscripts; no subscript means that the element is just 1)
Notice that the number of H is already balance but the number of O is not. In order to balance the O, you need to multiply the element by 2, but you CANNOT do this by simply changing the subscript.
Hence,
H
2
+
O
2
=
2
H
2
O
Left side: H = 2 ; O = 2
Right side: H = 2 x 2 = 4 ; O = 1 x 2 = 2
Now, notice that the number of O is now balance (both are 2) but the number of H is not (since
H
2
O
is a substance and not an element, you need to multiply everything by 2). So, what to do?
You also multiply the left side H by 2. Hence,
2
H
2
+
O
2
=
2
H
2
O
Left side: H = 2 x 2 = 4 ; O = 2
Right side: H = 2 x 2 = 4 ; O = 1 x 2 = 2
The equation is now balanced.
Teresa has taken three tests worth 100 points each. Her scores are 85, 93, and 88. She has one test left to take.
To get an average score of 90, what must the sum of all her test scores be?
a.
400
c.
600
b.
360
d.
300
Answer:
SOrry it makes me writer sotufjksankdn
Explanation:
Which describes a concept that was not previously known but was developed as a direct result of Mendel’s experiments with pea plants?
Organisms with a recessive trait can have a dominant allele for the trait.
All observable traits are dominant.
Organisms have more than one observable trait.
Organisms can be bred for specific traits based on a pattern of inheritance.
Answer:
Organisms with a recessive trait can have a dominant allele for the trait.
Explanation:
hope this helps
Answer
D
Organisms can be bred for specific traits based on a pattern of inheritance.
ATOMS: MULTIPLE CHOICE
Answer:
Double bonds. It says I have to write more words lol but yeah it's double bonds
How many moles are found in a 350.mL solution of 13.5M HNO3
Answer: Moles are found in a 350.mL solution of 13.5M [tex]HNO_{3}[/tex] are 4.725 mol.
Explanation:
Given: Volume = 350 mL (1 mL = 0.001 L) = 0.350 L
Molarity = 13.5 M
Molarity is the number of moles of a substance present in a liter of solution.
Therefore, moles of [tex]HNO_{3}[/tex] present in the given solution are calculated as follows.
[tex]Molarity = \frac{moles}{Volume (in L)}\\13.5 M = \frac{moles}{0.350 L}\\moles = 4.725 mol[/tex]
Thus, we can conclude that moles found in a 350.mL solution of 13.5M [tex]HNO_{3}[/tex] are 4.725 mol.
What does a nucleus look like
Answer:
Explanation:
The nucleus is an organelle found in eukaryotic cells. Inside its fully enclosed nuclear membrane, it contains the majority of the cell's genetic material. This material is organized as DNA molecules, along with a variety of proteins, to form chromosomes.
When 0.46 mol of magnesium chloride reacts with sodium to produce sodium chloride
and magnesium. how many grams of sodium chloride will be produced?
Answer:
53.8g
Explanation:
plz let me know if the answer is right than I can explain it to u :)
PLEASE HELP!
The specific heat of octane, C8H18(l), is 2.22 J/(g⋅K).
How much heat is needed to raise the temperature of 76.0 g of octane from 10.6 ∘C to 26.0 ∘C?
Express your answer in joules to three significant figures.
Answer:
Q = 2.60 • [tex]10^{3}[/tex] J
Explanation:
Our specific heat capacity equation is:
Q = mC∆T
Q is the energy in joules.
m is the mass of the substance.
∆T is the temperature chance.
Let's plug in what we know.
We have 76.0 g of octaneThe specific heat capacity of octane is 2.22 J/(g•K)The temperature increases from 10.6º to 26.0º (a 15.4º increase)Q = 76.0(2.22)(15.4)
Multiply.
Q = 2598.288
We want three significant figures.
Q = 2.60 • [tex]10^{3}[/tex]
or
Q = 2590 J
Hope this helps!
Answer:6,985.008
Explanation:
so the hear formula is mass times specific heat times change in temperature (kelvin) so what i did was got the change in temperature (41.4 K) and multiplied that times 2.22 J/(g•K)and multiplied that by 76 grams of Octane to get the Answer (not in scientific notation)
Indicate what reaction is happening at the anode, and for the reaction below, which species would be the anode? Sn(s) + 2 Ag⁺(aq) → Sn2+(aq) + 2 Ag(s)
Answer:
Sn --> Sn2+ + 2e-
Explanation:
At anode oxidation reaction occur. In this reaction Sn is getting oxidized to state +2 while Ag is reduced from +1 to 0.
Hence, reaction at anode will be
Sn (s) --> Sn2+ (aq) + 2e-
At cathode the following reaction occur
2 Ag⁺ + 2e- ---> 2Ag (s)
Pick the MAIN output form of energy.
A snail eating a carrot so the snail has energy to move.
Electrical Kinetic Energy
Motion Kinetic Energy
Chemical Potential Energy
Thermal Kinetic Energy
Motion Potential Energy
Nuclear Potential Energy
Answer:
Chemical Potential Ener
Five hundred feet is the same as how many meters?
When copper (II) chloride reacts with sodium nitrate, NaNO3, copper (II) nitrate, Cu(NO3)2, and sodium chloride are formed. Write a balanced chemical equation for this reaction. Then determine how much sodium chloride can be formed when 15.0 grams of copper (II) chloride react with 20.0 grams of sodium nitrate.
Answer:
CuCl2 + 2NaNO3 → Cu(NO3)2 + 2NaCl
Explanation:
m(NaCl) =m(CuCI2) × 2Mr(NaCl) / Mr(CuCI2)
= 15 × 2 × (94/135)
=20.89 g
You're at the zoo and have a big red 1.80 L helium balloon. The barometric pressure today is 785 mmHg. Then you hear the roar of a lion. Startled, you accidentally release the balloon. It flies away. By the time it reaches the clouds, the atmospheric pressure that high is only 0.300 atmospheres. What would be the volume of the balloon up there?
Answer: The volume of the balloon up there is 6.192 L.
Explanation:
Given: [tex]V_{1}[/tex] = 1.80 L, [tex]P_{1}[/tex] = 785 mm Hg (mm Hg = 0.00131579) = 1.032 atm
[tex]P_{2}[/tex] = 0.300 atm, [tex]V_{2}[/tex] = ?
Formula used to calculate volume is as follows.
[tex]P_{1}V_{1} = P_{2}V_{2}[/tex]
Substitute the value into above formula as follows.
[tex]P_{1}V_{1} = P_{2}V_{2}\\1.032 atm \times 1.80 L = 0.300 atm \times V_{2}\\V_{2} = 6.192 L[/tex]
Thus, we can conclude that the volume of the balloon up there is 6.192 L.
Balance this chemical equation
C4H8 + O2 --> CO2 + H2O
Answer:
you're going to start by balancing the carbon first. To do this, you want to times the carbon on the right by 4 so we put a 4 in front of the CO2.C4H8 + O2 --> 4CO2 + H2OWe're now going to try and balance the hydrogen by putting a 4 in front of the H2O.C4H8 + O2 --> 4CO2 +4H2OThen we're going to count the oxygens on both side and balance them by putting a 6 in front of the O2.C4H8 + 6O2 --> 4CO2 + 4H2O
Answer:
hope this helps :) please correct me if I'm wrong.
C4H8 + 6O2 --> 4CO2 + 4H2O.
Explanation:
C4H8 + O2 --> CO2 + H2O
C=4 C=1
H=8 H=1
O=2 ---> O=3
C4H8 + 6O2 --> 4CO2 + 4H2O
C=4 C=4
H=8 H=8
O=12 ---> O=12
Which planet would make the closest approach to Earth as the planet orbits the sun?
Planet
Distance from the Sun in AU
Mercury
0.387
Venus
0.723
Earth
1
Mars
1.52
Jupiter
5.20
Saturn
9.54
Uranus
19.2
Neptune
30.1
A. Mercury
B. Jupiter
C. Venus
D. Mars
Answer:
D
Explanation:
Mars is nearest to Earth
Among the given planets, Mercury would make the closest approach to Earth as it orbits the Sun. This is because Mercury has the smallest average distance from the Sun, with a value of 0.387 astronomical units (AU).
The distances of the planets from the Sun are measured in astronomical units, where 1 AU is the average distance between the Earth and the Sun. With a distance of 0.387 AU, Mercury's orbit is closer to the Sun compared to the other planets listed.
As Mercury orbits the Sun, its path occasionally brings it closer to Earth when both planets align in their respective orbits. This phenomenon is known as a close approach or inferior conjunction. During this alignment, Mercury appears closer to Earth in the night sky, making it the planet that would make the closest approach to Earth among the given options.
Hence, the correct option is option A.
Learn more about planets here:
https://brainly.com/question/29765555
#SPJ 7
What ideas do you have about what makes Anchorage, Alaska, cooler than Christchurch, New Zealand?
-science
Answer:
You can explore a variety of things in Alaska. There are so many activities you could do such as visiting museums and hiking and tons more. The thing about this is that it is out in the wilderness which makes it more exciting and cooler to see nature more than it does in new zealand. The climate can be pretty chilly in Alaska but it is way much fun to see tons of glaciers. New zealand has eathquakes frequently whilst Alaska doesn't.
Two water molecules are weakly attracted to each other when a slightly positive hydrogen atom in the first molecule is attracted to the slightly negative oxygen atom on the second molecule. What type of bond is this
You have been given two samples of water. One is from the atlantic ocean and the other is from lake superior. Describe how you will tell them apart without tasting them?
Answer:
i think by their salinity (the saltiness or amount of salt dissolved in a body of water)
Explanation:
Water salinity is measured by passing an electric current between the two electrodes of a salinity meter in a sample of water.
What two metals are have atoms larger than that of sodium
Answer: potassium and rubidium
Explanation:
1) The group 1 of the periodic table contain six elements namely Lithium(Li), Sodium(Na),Potassium(K),Rubidium(Rb),Cesium(Cs) and Francium(Fr). These metals are called alkali metals because they form alkalies( i.e. strong bases capable of neutralizing acids) when they react with water.
2) The heavier alkali metals (K, Rb, and Cs) react so vigorously that they invariably explode.
3) This trend, which is not consistent with the relative magnitudes of the reduction potentials of the elements, serves as another example of the complex interplay of different forces and phenomena—in this case, kinetics and thermodynamics.
what is atom
what is atom
Answer:
An atom is a chemical substance which exist freely in nature without any reaction .
What reacts with the hydrocarbon fuel in a combustion reaction? small words, please
Hydrocarbon combustion refers to the chemical reaction where a hydrocarbon reacts with oxygen to create carbon dioxide, water, and heat.
#small words#La presión de vapor del agua pura a 25 oC es 24,56 mmHg y la de agua de mar es 23,99 mmHg, y si suponemos que el agua de mar sólo contiene cloruro de sodio, calcula su concentración molal.
Answer:
1.32m es la concentración de NaCl en el agua de mar
Explanation:
La disminución de presión de vapor sigue la ecuación:
P = XP⁰
Donde P es la presión de la solución = 23.99mmHg
X es la fracción molar del solvente
P⁰ la presión del agua pura = 24.56mmhg
23.99mmHg = X*24.56mmhg
0.97679 = X
La fracción molar del solvente se define como:
Moles Solvente / (Moles soluto + Moles solvente)
Asumiendo que las moles de soluto = NaCl = 1:
0.97679 = Moles solvente / (1 + Moles solvente)
0.97679 + 0.97679 Moles solvente = Moles solvente
0.97679 = 0.02321 moles solvente
42 moles solvente = 42 moles de agua.
masa de agua:
42 moles * (18.01g / mol) =758g de agua = 0.758kg
Molalidad, m, son las moles de soluto (1mol NaCl) por kg de solvente (0.758kg):
1mol / 0.758kg =
1.32m es la concentración de NaCl en el agua de marHow can I solve this?
Explanation:
option d
hope helps u
have a nice day
URGENT!!
which has the largest London dispersion force out of the ones listed
In a bakery shop, a chef bakes a cake in an electric oven. The energy outputted from the oven becomes an input to the cake system.
Which energy form is readily outputted from the oven system?
A. chemical energy
B. electrical energy
C. sound energy
D. thermal energy
One of your classmates asks you why an ice cube melts in water. Which of the following
would be your best explanation?
a.) The ice cube transfers energy to the air.
b.) The ice cube transfers energy to the water.
c.) Energy is transferred from the ice to the water and from the water to the ice.
d.) The water transfers energy to the ice cube.
Answer:
the answer is B
Explanation:
the ice puts 8ts cold into the water taking it away from the ice
Question 2: if an object is heavy, the acceleration:
Increases
Equal
Decreases
Giving brainlist. On this one
Answer:
Explanation:
if an object is heavy,the acceleration decreases because the acceleration produced on a body is inversely proportional to its mass.
Can someone please check my answer?
Explanation:
yes that's correct
A sample of hydrogen gas collected by displacement of water occupied 30mL at 24 C on a day when the barometric pressure was 736t orr. What volume would the hydrogen occupy if it were dry and at STP? The vapor pressure of water at 24 C is 22.4 torr
Answer:
[tex]v_2=6,48*10^{-4}L[/tex]
Explanation:
From the question we are told that:
Volume of hydrogen [tex]V_1=30mL=>30*10^{-3}[/tex]
Temperature [tex]T_1=24C=>24+273=>297k[/tex]
Pressure of water [tex]P_1=22.4torr=>\frac{22.4}{760}=0.0295atm[/tex]
Let
STP(Standard Temperature and pressure)
[tex]T_2=273K[/tex]
[tex]P_2=1atm[/tex]
Generally the equation for ideal gas is mathematically given by
[tex]\frac{p_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]
Therefore
[tex]v_2=\frac{P_1v_1T_2}{T_1P_2}[/tex]
[tex]v_2=\frac{0.0295*30*10^{-3}*273}{297*1}[/tex]
[tex]v_2=6.48*10^{-4}L[/tex] (at STP(Standard Temperature and pressure))
Most of the electricity that is used in everyday life comes from________ current.
Fill in the blank
Answer:
electric is your answer :)
Explanation:
Edge STEM instruction/assignment perhaps???
Answer:
A. C (alternate current)
Formulas for the compounds below.
Sulfur Trioxide
Sodium hydroxide
Sulphur Trioxide = So3
Sodium Hydroxide = NaoH
Answer:
[tex]\huge\boxed{Sulfur \ Trioxide\hookleftarrow}[/tex]
✐ SO3[tex]\huge\boxed{Sodium \ Hydroxide\hookleftarrow}[/tex]
✐ NaOHʰᵒᵖᵉ ⁱᵗ ʰᵉˡᵖˢ
# ꧁❣ RainbowSalt2²2² ࿐