Answer:
the moon
Explanation:
I need help with this :/
Answer:
Blank 1: 1
Blank 2: 2
Blank 3: 1
Blank 4: 1
Explanation:
Assuming this is to balance the equation, write out the amount of each element you have on the reactants side and on the products side
Reactants Products
Ca 1 Ca 1
C 2 C 2
H 2 H 4
O 1 O 2
Comparing the two, we can see that hydrogen and oxygen have different amounts between reactants and products. Therefore, we need to multiply by some number to get the two equal. If we multiply the reactants by 2 we will get the correct amount in the products. So we put a 2 in front of the H₂O to signify this.
The balanced chemical reaction is
CaC₂ + 2 H₂O --> C₂H₂ + Ca(OH)₂
litmus is made from plant pigment.
it is red when placed in an acidic solution.
it is blue when placed in an alkaline solution.
it is purple when neutral.
a) what do we call substance that change colour like this?
b) what colour would litmus be in a solution of pH 10?
c) what colour would you expect litmus to be in pure water?
Answer:
For (a): The substances are known as acids and bases.
For (b): The color of the litmus for pH = 10 will be blue.
For (c): The color of the litmus for pure water will be purple.
Explanation:
pH determines the acidity or basicity of a solution. There are three types of solution classified based on the pH:
If pH<7 then the solution is acidic in nature If pH>7 then the solution is basic/alkaline in nature If pH=7 then the solution is neutral in natureLitmus paper is used as an indicator to know the type of solution. There are 2 types of litmus paper:
Red litmus paper: It turns blue when placed in a basic/alkaline solution.Blue litmus paper: It turns red when placed in an acidic solution.(a):
An acid is defined as the chemical species that produces hydrogen ions in the solution while a base is defined as the chemical species that produces hydroxide ions in the solution.
(b):
Given pH value = 10
The solution is basic in nature, thus the color of litmus will be blue.
(c):
Pure water is neutral in nature and has a pH of 7.
Thus, the solution of litmus would be purple.
Which statement describes particles of an ideal gas, based on the kinetic molecular theory?
Answer:
There are 5 steps/rules of the ideal gases based on kinetic theory.
Explanation:
1. Particles in a gas are constant moving in random motion.
2. combined volume of the particles is negligible.
3. particles exert no forces on one another
4. any collisions between the particles are completely elastic
5. the average kinetic energy of particles is proportional to temperature in kelvins.
(I had help explaining steps from Sal Khan. I hope this helps! Have a great day!)
Calculate the approximate volume of a 1.50 mol sample of gas at 15.0°C and a pressure of 3.75 atm
Answer
F 1.73 L
G 5.93 L
H 8.65 L
J 9.46 L
Answer:
The answer is J (9.46 L)
Litmus turns
in acidic solutions.
green
yellow
blue
red
Answer:
red
Explanation:
red shows if solution is acidic
Consider the titration of 82.0 mL of 0.140 M Ba(OH)2 by 0.560 M HCl. Calculate the pH of the resulting solution after the following volumes of HCl have been added. (a) 0.0 mL WebAssign will check your answer for the correct number of significant figures. 13.447 Correct: Your answer is correct. (b) 15.0 mL WebAssign will check your answer for the correct number of significant figures. 12.25 Incorrect: Your answer is incorrect.
Answer:
a) pH = 13.447
b) pH = 13.176
Explanation:
Ba (OH)₂ is a strong base and ionizes completely in solution to give barium amend hydroxide ions.
The equation of the dissociation of Ba(OH)₂ is given below:
Ba(OH)₂ ----> Ba2+ + 2OH-
1 mole of Ba(OH)₂ produces 2 Moles of OH- ions
a) Before the addition of HCl, i.e.,when 0.00 mL of HCl has been added;
Concentration of hydroxide ions, [OH-] = 0.140 x 2 = 0.a) [OH-] = 0.100 x 2 = 0.280
pOH = -log [OH-]
pOH = -log (0.280)
pOH = 0.553
pH = 14 - 0.553= 13.447
b) pH when 15.0 mL HCl has been added
Moles Ba(OH)₂ = concentration × volume
Volume of Ba(OH)₂ = 82.0 mL = 0.082 L, concentration = 0.140 M
moles of Ba(OH)₂ = 0.082 x 0.140 = 0.01148 moles
moles OH- produced by 0.01148 moles of Ba(OH)₂ = 2 x 0.01148= 0.02296
moles HCl = 0.0150 L x 0.560 = 0.0084
moles of H+ produced by 0.0084 HCl = 0.0084
0.0084 H+ willnreact with 0.0084 moles of OH-
moles OH- left after the reaction = 0.02296 - 0.0084 = 0.01456 moles
total volume of new solution = (82 +15) mL = 97 mL => 0.097 L
Concentration of OH- ions = moles / volume
[OH-] = 0.01456 / 0.097 = 0.1501
pOH = -log [OH-]
pOH = -log (0.150)
pOH = 0.824
pH = 14 - 0.824
pH = 13.176
a piece of debris travelling through space which ranges in size from a grain of sand to over 100ft in diameter
Answer:
Meteoroids are tiny asteroids or the broken-off crumbs of comets and sometimes planets. They range in size from a grain of sand to boulders 3 feet (1 meter) wide. When meteoroids collide with a planet's atmosphere, they become meteors
pls give me brainliest lol :)
What happens when you change the number of protons keeping the numbers of other particles the same?
Answer:
See explanation
Explanation:
The atomic number refers to the number of protons in the nucleus of an atom. We identify an element by its atomic number.
When the atomic number of an atom of an element is changed, we have changed the identity of that atom and transformed it into an atom of a different element.
For example, if we add a proton to a sodium atom, we create a magnesium atom. If we remove a proton from a sodium atom, we create a neon atom.
how can a match light without a spark
Answer:
Use friction
Explanation:
Friction is the force that stops something in motion. It also heats up something, creating a gravitational heat! A match striked against the lighter will create a flame, because of friction :)
Explain why only one type of seismic wave was recorded at location B. (1 sentence only!)
Answer:
p wave
Explanation:
The P wave is designated the primary preliminary wave because it is the first to arrive at a seismic station after an earthquake. It travels at a speed usually less than 6 kilometers per second in the Earth's crust and jumps to 13 kilometers per second through the core.
using details and examples from the text explain how the digestive system helps your body obtain the energy it needs
Answer:
Explanation:
How much heat is required to raise the temperature of 250.0 g of mercury by 52 degrees * C with a specific heat of 4.18
To raise the temperature of 250.0 g of mercury by 52°C with a specific heat capacity of 4.18 J/ g°C the heat required is 5.434×10¹ kJ.
What is specific heat capacity ?For a substance, it's specific heat capacity is the amount of energy required to raise the temperature of unit mass of that substance by 1°C.
If, specific heat capacity (c) = 4.18 J/ g°C
Mass of the substance (m) = 250.0 g
Change in temperature (ΔT) = 52°C
Energy (Q) = ?
Then mathematically the relation could be represented as
c = [tex]\frac{Q}{ \ m \ (\Delta\ T )}[/tex]
Therefore, [tex]Q = m\times c \times (\Delta\ T)[/tex]
[tex]Q = 250 \times 4.18 \times 52[/tex]
[tex]Q = 54,340 J\\Q = 5.434 \times 10^1 kJ[/tex]
So, to raise the temperature of 250.0 g of mercury by 52°C with a specific heat capacity of 4.18 J/ g°C the heat required is 5.434×10¹ kJ.
To know more on specific heat capacity, click on
https://brainly.com/question/27991746
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A man pulled a food cart 4.5 m to the right for 15 seconds. What is the average speed of the food cart to the nearest tenth of a m/s?
The average speed of the food cart to the nearest tenth of a m/s is 0.3 meter per second.
How do we calculate speed?Speed of any moving body will be calculated by using the below formula as:
Speed = Distance / Time
Given that, Distance travelled to the right side = 4.5m
Time to travel = 15 sec
On putting values on the above equation, we get
Speed = 4.5 / 15 = 0.3 m/s
Hence required speed is 0.3m/sec.
To know more about speed, visit the below link:
https://brainly.com/question/6504879
Determine the mass of ammonium chloride, NH4CI, required to prepare 0.250 L of a 0.35 M solution of ammonium chloride.
Which statement is false? *
a.) Pressure must be exerted on a sample of a gas in order to confine it.
b.) Gases diffuse into each other and mix almost immediately when put into the same
container.
c.) The molecular weight of a gaseous compound is a non-variable quantity
d.) Gases can be expanded without limit.
e.) The density of a gas is constant as long as its temperature remains constant.
Answer:
d.) gases can be expanded without limit.
can someone at least help with one of these i will give brainliest
Answer:
1375 J/kg.°C
Explanation:
From the question First question,
Q = cm(Δt)................... Equation 1
Where Q = Heat released, c = specific heat capacity of the unknown metal, m = mass of the unknown metal, Δt = Change in temperature.
make c the subject of the equation
c = Q/mΔt.................. Equation 2
Given: Q = -5500 J (Since heat is released, Q is negative), m = 200 g = 0.2 kg, Δt = 10-30 = -20°C
Substitite these values into equation 2
c = -5500/[0.2×(-20)]
c = -5500/-4
c = 1375 J/kg.°C
Can someone help me with this. Thank you
Answer:
Location x is experiencing daytime because it is facing directly to the sun.
Explanation:
From a background understanding of the solar system, the side of the planet facing the sun will be experiencing daytime while the other side of the planet will be experiencing either partial or total darkness depending on the location.
From the diagram given above, we can see clearly that location x is facing the sun and as such, light rays from the sun lightens the location. When this happens, location x will be experiencing daytime.
In conclusion, location x is experiencing daytime because it is facing directly to the sun.
If it takes 25 mL of 0.05 M HCl to neutralize 345 mL of NaOH solution, what is the concentration, M, of the NaOH solution?
Answer:
400ml
Explanation:
Evaluate three communication skills that can assist you in sustaining positive relationships
1. Accept and celebrate differences. One of the biggest challenges we experience in relationships is that we are all different. We can perceive the world in many ways. Certainly astumbling block that we come across when we try to build relationships is a desire or an expectation that people will think like we do and, in this way, it is so much easier to create a rapport. We feel more comfortable when we feel that people “get” us and can see our point of view. Life, however, would be very dull if we were all the same and, while we may find it initially easier, the novelty of sameness soon would wear off. So accepting and celebrating that we are all different is a great starting point.
2. Listen effectively. Listening is a crucial skill in boosting another person’s self-esteem, the silent form of flattery that makes people feel supported and valued. Listening and understanding what others communicate to us is the most important part of successful interaction and vice versa.
Active or reflective listening is the single most useful and important listening skill. In active listening, we also are genuinely interested in understanding what the other person is thinking, feeling, wanting, or what the message means, and we are active in checking out our understanding before we respond with our own new message. We restate or paraphrase our understanding of their message and reflect it back to the sender for verification. This verification or feedback process is what distinguishes active listening and makes it effective.
3. Give people your time. Giving time to people is also a huge gift. In a world where time is of the essence and we are trying to fit in more than one lifetime, we don’t always have the time to give to our loved ones, friends, and work colleagues. Technology has somewhat eroded our ability to build real rapport and we attempt to multi-task by texting and talking at the same time.
Being present in the time you give to people is also important, so that, when you are with someone, you are truly with someone and not dwelling in the past or worrying about the future. The connection we make with other people is the verytouchstone of our existence, and devoting time, energy, and effort to developing and building relationships is one of the most valuable life skills.
The H-R diagram is useful in
studying all of these about a star
A.except for its brightness b.location in the sky c.temperature
D.magnitude
Answer:
b.location in the sky (If the question is saying:The H-R diagram is useful in
studying all of these about a star except for)
Explanation:
The theoretical HR diagram plots the temperature of the star vs their luminosity (brightness) and the observational HR diagram plots color of the stars vs the absolute magnitude. Depending on mass, stars will also go through specific evolutionary stages that can be seen through the location of the star on the HR diagram. However, the HR diagram will not have data on the location of the star in the sky.
8. What is a compound?
A. a substance in which the atoms of three or more elements are combined together
B. an atom with more electrons than protons
C. a substance in which the atoms of two or more elements are combined together
D an atom with more neutrons than protons
Answer:
c
Explanation:
_______ in saliva start the chemical digestion process
Answer:
amylase
Explanation:
Long scratch marks that are left behind as evidence of glaciers are called
A. striations
B. cirques
C. fjords
D. roche moutonnees
Answer:
it is A striations
Explanation:
..........
Answer:
Striation
Explanation:
THIS IS FOR SCIENCE PLS HELP ME WRITE MY PROMPT How does the human population and human activity affect Earth?
If 25.0 g of iron(III) phosphate reacts with excess sodium sulfate, how many molecules of sodium phosphate can be made?
Answer:
so mucjsuat least amount of soduim is will be 25percent
Consider the reaction.
HCl(aq) + KOH(aq) ⟶ KCl(aq) + H2O(l)
In the reaction shown, HCl is
Answer:
the acid used to neutralize the base in oder to form a salt and water
When(NH4)2SO4(aq) and Ba(NO3)2(aq) react
Answer:
1 (NH4)2SO4 + Ba(NO3)2 → NH4NO3 + BaSO4
2 (NH4)2SO4 + Ba(NO3)2 → Ba(SO4) + (NH4)(NO3)
Explanation:
Please help. Which of these are chemical or physical change?
Answer:
Explanation:
a is a physical change you could put the peices back together
b is a chemical change because you cant unburn wood
c is a chemical change because you cant unbake it
d is a physicl change you could te your time and unmix it
Add labels for mass extinction and adaptive radiation:
Answer:
Couldn't figure out how to edit the other one to attach the image, but here is it with the labels. Also put the same explanation down below so you don't have to go to the other if you wanted to look at it in conjunction with the image.
Explanation:
Mass extinctions are periods of time where the organisms are essentially wiped out in an extremely brief period of time. You can see how the species just drops off. Adaptive radiation occurs when there is a diversification of a group of organisms as evident by the rise in the number of marine animal groups shown by the bracketed area.
2C2H6 + 7O2 ------> 4CO2 + 6H2O
If you are given 10 grams of C2H6 and 10 grams of O2 how many grams of H2O would you produce? Hint: find the limiting reactant. Answer should have 3 decimal places.
Right answer gets brainliest
We convert the masses of our reactants to moles and use the stoichiometric coefficients to determine which one of our reactants will be limiting.
Dividing the mass of each reactant by its molar mass:
(10 g C2H6)(30.069 g/mol) = 0.3326 mol C2H6
(10 g O2)(31.999 g/mol) = 0.3125 mol O2.
Every 2 moles of C2H6 react with 7 moles of O2. So the number of moles of O2 needed to react completely with 0.3326 mol C2H6 would be (0.3326)(7/2) = 1.164 mol O2. That is far more than the number of moles of O2 that we are given: 0.3125 moles. Thus, O2 is our limiting reactant.
Since O2 is the limiting reactant, its quantity will determine how much of each product is formed. We are asked to find the number of grams (the mass) of H2O produced. The molar ratio between H2O and O2 per the balanced equation is 6:7. That is, for every 6 moles of H2O that is produced, 7 moles of O2 is used up (intuitively, then, the number of moles of H2O produced should be less than the number of moles of O2 consumed).
So, the number of moles of H2O produced would be (0.3125 mol O2)(6 mol H2O/7 mol O2) = 0.2679 mol H2O. We multiply by the molar mass of H2O to convert moles to mass: (0.2679 mol H2O)(18.0153 g/mol) = 4.826 g H2O.
Given 10 grams of C2H6 and 10 grams of O2, 4.826 g of H2O are produced.