Answer:
With the policies of containment, the United States hoped to effectively stop the spread of communism and their newest threat. After the war, the United States and the Soviet Union had very different ideas on how to rebuild.
What gas in the air is used by plants to make their own food? (2 points)
Nitrogen
Water vapor
Carbon dioxide
Oxygen
Answer:
Carbon Dioxide
Explanation:
Carbon dioxide gets turned into oxygen
infrared in __________controls
I will mark briniest to the one who is correct, also its fill in the blank I wasnt paying attention in school
Answer:
remote
Explanation:
i hope it helps
3. Move the slider on the burette to the top to add about 25 mL of NaOH to the flask. What
happens, and what does this tell you about the pH of the flask?
Page Break
LED
Answer:
When you move the burette slider to the top of a flask and add about 25 mL of NaOH to the flask, you will cause a concentration of OH- molecules. This will make the solution become a basic solution and make the litmus paper blue.
Explanation:
After reading your question, we can see that you are carrying out a test to discover the nature of the pH of a solution. This type of test uses litmus paper, which is an indicator of the presence of acids and bases, being able to determine the pH of a solution. This paper is soaked in organic ink and when placed in an acidic solution, it is red in color. However, when placed in a basic solution it has a blue color.
An acidic solution is one that has a high concentration of H+ atoms and has the ability to donate electrons. The basic solution, on the other hand, has a high concentration of OH- and has the capacity to receive electrons.
When you move the burette slider to the top of a flask and add about 25 mL of NaOH to the flask, you will cause a concentration of OH- molecules. This will make the solution become a basic solution and make the litmus paper blue, that is, the solution has the basic pH.
pls show ur work will mark the brainliest
Answer:
M = 0.47
Explanation:
1 - Turn grams to moles using molar mass:
16g NaOH × 1 mol NaOH / 40g NaOH = 0.4 mol NaOH
2- Turn milliliters to liters:
855mL × 1 L / 1000mL = 0.86 L
3- Use formula which is M = moles of solute / liters of solvent:
M = 0.4 mol NaOH / 0.86 L = 0.47
what type of wave moves the particles parallel to the motion of the wave
a.electromagnetic
b. longitudinal
c. transverse
d.water
Answer:
c
Explanation:
Which is the correct result of mitosis and
meiosis?
Answer:
[tex]\boxed {\boxed {\sf B. \ 2 \ diploid \ cells \ and \ 4 \ haploid \ cells}}[/tex]
Explanation:
Mitosis is a type of cell division. It occurs in somatic cells, which are basically any cells other than sex cells. A cell replicates the genetic material then undergoes one division to create 2 identical cells, both with a complete set of chromosomes. These are known as diploid cells.
Meiosis is another type of cell division, but it occurs only in sex cells, called gametes. The cell replicates the genetic material and the chromosomes cross over, which creates completely unique cells. The cell divide to create 2 cells, but then they divide again to create 4 cells. They each have half of the chromosomes of a somatic cell, so they are haploid cells
So, mitosis results in 2 diploid cells and meiosis forms 4 haploid cells.
For the reaction 2H2 + O2 --> 2H2O, how many grams of oxygen are needed to react 3 moles of hydrogen?
Answer:
48 grams
Explanation:
The chemical equation for the reaction is the following:
2 H₂ + O₂ → 2 H₂O
That means that 2 moles of H₂ react with 1 mol of O₂ to produce 2 moles of H₂O. We convert the moles of oxygen (O₂) by using the molecular weight (MW) as follows:
MW(O₂) = 16 g/mol x 2 = 32 g/mol
mass of O₂ = 1 mol x 32 g/mol = 32 g
So, we have the following stoichiometric ratio: 32 g O₂/2 moles H₂. We have 3 moles of hydrogen (H₂), so we multiply the moles by the stoichiometric ratio to calculate how many grams are needed:
3 moles H₂ x 32 g O₂/2 moles H₂ = 48 g O₂
Therefore, 48 grams of O₂ are needed to react with 3 moles of H₂.
How many moles of carbon atoms is 7.72 x 10 ^24 atoms of carbon? Round to 2 decimal places
Answer:
12.82 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{7.72 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 12.8 239[/tex]
We have the final answer as
12.82 molesHope this helps you
PLZ HELP!
Where have you seen or known of examples of waves in YOUR LIFE? Based on science terms of a wave.
Answer:
QUESTION:
Where have you seen or known of examples of waves in YOUR LIFE? Based on science terms of a wave.
ANSWER:
I've seen the following in my life:
~ Lightwaves
~ Heatwaves
~ Electromagnetic waves
~ X-rays
~ Tsunami Waves
Explanation:
Hope that this helps you out! :)
If you have any questions please put them in the comment section below this answer.
Have a great rest of your day/night!
Please thank me on my profile if this answer has helped you.
A sample of a gas in a balloon has a volume of 4.20 L and temperature of 48.2 °C. Calculate the volume when
the temperature is lowered to 15.4°C at constant pressure.
a. 3.77
b. 4.20
c. 1.34
d. 13.15
e. 4.68
Answer:
V1/T1=V2/T2
4.20L/321.2K=x/288.4K
multiply both side by 288.4
1211.28/321.2=x
x=3.77L
Option 3 13.15 is the correct answer.
What is Charles law?Charles's law exists as an experimental gas law that explains how gases tend to expand when heated. A modern statement of Charles's law exists: When the pressure on a sample of a dry gas exists held constant, the Kelvin temperature and the volume will be in direct proportion.
According to Charles law
The volume occupied by a fixed amount of gas is directly proportional to its absolute temperature, if the pressure remains constant.
[tex]V1/T1=V2/T2[/tex]
Where,
[tex]V1[/tex]= first volume
[tex]V{2}[/tex] = second volume
[tex]T{1}[/tex] = first temperature
[tex]T{2}[/tex]= second temperature
Here, at constant pressure,
[tex]V1/T1=V2/T2[/tex]
[tex]V1[/tex]=4.20 L
[tex]V2[/tex]= x
[tex]T1[/tex]=321.2 K
[tex]T2[/tex]=288.4 K
Therefore, [tex]V1/T1=V2/T2[/tex]
4.20L/321.2K=x/288.4K
1211.28/321.2=x
x=3.77L
Thus option a is correct.
To learn more about Charles law refer to:
https://brainly.com/question/16927784
#SPJ2
Which of the following has the greatest influence on the size and force of waves?
A.
seasons
B.
Moon’s gravity
C.
wind speed
D.
Earth’s gravity
if an EXOTHERMIC reaction takes place in a container, the container will feel
a. hotter
b.colder
c. neither hotter nor colder
Please help me find the answer , thank you.
Answer:
the answeer is definitely silicon.
what are the factors that affect the rate of chemical reaction?
Answer:
surface area of a solid reactant.
concentration or pressure of a reactant.
temperature.
nature of the reactants.
presence/absence of a catalyst.
Comprehension Questions:
1. What are the horizontal (from left to
right) parts of the periodic table
called?
Weathering (breaking off sediments upriver), erosion (moving the sediments down river) and finally deposition caused the changes in the river.
What helps hold sediments in place to prevent erosion?
Answer:
Explanation:
Maintaining a healthy, perennial plant cover.
Mulching.
Planting a cover crop – such as winter rye in vegetable gardens. ...
Placing crushed stone, wood chips, and other similar materials in heavily used areas where vegetation is hard to establish and maintain.???
What determines crystal size in minerals formed by lava or magma?
Answer:
When magma cools, crystals form because the solution is super-saturated with respect to some minerals. If the magma cools quickly, the crystals do not have much time to form, so they are very small. If the magma cools slowly, then the crystals have enough time to grow and become large.
Explanation:
fill in the blank if its true or false
T=True
F=False
_________ 1. Stars do not change over their life cycles.
_________ 2. A protostar is the latest stage of a star’s life.
_________ 3. The larger the mass, the shorter the life cycle.
_________ 4. The hottest stars are blue and the coolest stars are red.
_________ 5. The white dwarf eventually runs out of fuel and dies as a red dwarf.
_________ 6. Our Sun is in the main sequence at the moment.
Answer: 1. F
2. F
3. T
4. F
5. T
6. T
Explanation:
I am not sure i'm sorry if it isn't right
A cough sytup contains 0.5M dextromethophan. How many moles of the cough supressant are in 21.3mL of the cough syrup?
Answer:
0.0107 mol
Explanation:
Multiply concentration by volume (in liters) to get moles.
0.5 M • 0.0213 L = 0.0107 mol
The specific heat of nickel is 0.445 J/g degree Celsius. How much heat is required to heat a 168 gram piece of nickel from 15.2 degrees Celsius to 43.6 degrees Celsius?
Select the correct answer.
Which statement best describes how chemical equations demonstrate conservation of mass?
A.
The number of reactants is the same as the number of products.
B.
The compounds are the same on each side of the reaction.
C.
The number of atoms of each element is the same on each side of the equation.
D.
The state of matter is the same on each side of the equation.
"C" is correct.
The Law of Conservation of Mass states that matter can be neither created nor destroyed. This is evident in chemical equations as you will always start and end with the same amount of atoms of every element. They are all still there; they have just been rearranged.
Answer: C) The number of atoms of each element is the same on each side of the equation.
Explanation: Mass cannot be created nor destroyed.
Construct an explanation for why the physical properties of the inner core, outer core, and lower mantle are essential for the development of Earth's magnetic field.
Answer:
The hot temperature of inner core and outer core is responsible for the production of magnetic field.
Explanation:
The physical properties of the inner core, outer core, and lower mantle are essential for the development of Earth's magnetic field because the very high temperature of inner core is responsible for the formation of magnetic field. If the inner core is not very hot so the magnetic field will not be generated and our earth's atmosphere will not be save from the solar wind. It can be blown away by the solar wind if this magnetic field is not present so we can conclude that the physical properties of inner core and outer core is important for the production of magnetic field.
Determine the volume of the product containing carbon produced when 15.0 g of C2H2 are reacted with an excess of oxygen gas
Answer:
25.8 L
Explanation:
Step 1: Write the balanced equation for the complete combustion of acetylene
C₂H₂ + 2.5 O₂ ⇒ 2 CO₂ + H₂O
Step 2: Calculate the moles corresponding to 15.0 g of C₂H₂
The molar mass of C₂H₂ is 26.04 g/mol.
15.0 g × 1 mol/26.04 g = 0.576 mol
Step 3: Calculate the moles of CO₂ produced from 0.576 moles of C₂H₂
The molar ratio of C₂H₂ to CO₂ is 1:2. The moles of CO₂ produced are 2/1 × 0.576 mol = 1.15 mol.
Step 4: Calculate the volume corresponding to 1.15 moles of CO₂
At standard temperature and pressure, 1 mole of CO₂ occupies 22.4 L.
1.15 mol × 22.4 L/1 mol = 25.8 L
When do recessive traits show in an offspring?
Answer:
Only individuals with an aa genotype will express a recessive trait; therefore, offspring must receive one recessive allele from each parent to exhibit a recessive trait. One example of a recessive inherited trait is a smooth chin, as opposed to a dominant cleft chin.
Explanation:
A covalent bond is formed when two atoms reach a stable state that balances:
MARK TWO RESPONSES
A
the repulsion between the nucleus protons of one atom to the electrons of the other atom
B
the attraction between the nucleus of one atom to the electrons of the other atom
C
the attraction between the two nuclei of the atoms, which both contain protons
D
the repulsion between the two nuclei of the atoms, which both contain protons
Answer:
B and I think A but you may want a secon opinion on that
Explanation:
I know that electrons are shared with covalent bonds so I assume the 2 answers are the ones with electrons it them
Which statement best explains why ice cubes will melt in a glass of tea?
The tea becomes saturated.
The ice cubes gain energy.
The tea’s freezing point increases.
The ice cube’s melting point decreases.
Answer:
The ice cubes gain energy
Explanation:
The ice cubes are gaining energy from the water's carbon dioxide, or H2O. They then melt because they cannot hold that energy.
A student prepares four different aqueous NaCl solutions according to the table. Which solution will have the highest molarity?
Answer:
what did you end up guessing
Explanation:
A gamma ray emission results in the release of energy without any apparent change in mass or nuclear charge.
Answer:
the answer to this is b thanks for
Answer:
True
A Gamma-Ray emission results in the release of energy without any apparent change in mass or nuclear charges
pls show your work will mark brainliest
Answer:
0.047 moles
Explanation:
From the question,
Applying
PV = nRT............. Equation 1
Where P = Pressure of CH₄ gas, V = Volume of CH₄ gas, n = number of moles of CH₄ gas, R = Molar gas constant.
make n the subject of the equation
n = PV/RT............. Equation 2
Given: P = 660 torr = (660×0.00131579) atm = 0.868 atm, V = 1300 mL = (1300/1000) L = 1.3 L, T = 20 °C = (20+273) K = 293 K
Constant: R = 0.082 atm.dm³/K.mol
Substitute these values into equation 2
n = (0.868×1.3)/(0.082×293)
n = 1.1284/24.026
n = 0.047 mole
Consider the sugar below.
CH2OH
О
CH2OH
Н
Н
Н
ОН Н
о
ОН
НО
т
ОН Н
Н
ОН
Т-
Н
Н
ОН
Which term best describes this sugar?
disaccharide
monosaccharide
polysaccharide
X saccharide
