Answer:
Scoop a soil sample into a fresh container, add 1/2 cup of water, and mix. Then, add 1/2 cup of baking soda. If the soil bubbles or fizzes, the soil is acidic. The reaction you're seeing is the result of acidic soil coming into contact with an alkaline substance (baking soda).
Explanation:
Hope this helped!
why burning of wood and cutting it into small pieces are considered as two different types
of changes.in sort type
.
اور بس انتي شلال
Answer:
burning causes pollution cutting results furniture
Explanation:
are u a nepali ?
Answer:
burning of wood, new substances are formed and hence it is a chemical change. While cutting the wood into small pieces no new substance is formed, thus it is a physical change. Hence, burning of wood and cutting it into small pieces are considered as two different types of changes.
What is an important part of the endocrine system that acts as a chemical messenger?
hormones
arteries
spinal cord
neurons
The image shows particles of salt dissolved in water.
How will the arrangement of salt particles most likely change?
Salt particles will move toward the left through diffusion.
Salt particles will move toward the left through active transport.
Salt particles will move toward the right through diffusion.
Salt particles will move toward the right through active transport.
Answer:
Salt particles will diffuse and towards where it is less that is left !!
so your answer is A !! left through diffusion !!
Explanation:
Answer:
Salt particles will move toward the left through diffusion
Explanation:
I just took the quiz.
If 150 G of wood started Burning, and 30 G of wood ash was left behind, how many grams of CO2 to gas was released
Answer:
120G
Explanation:
From the combustion process, about 120G of carbon dioxide would be released into the atmosphere.
For the chemical reaction to obey the law of conservation of matter, if only ash and carbon dioxide are the product, then the sum of the mass of the product and that of the reactants must be the same.
In a chemical reaction, matter is not created nor destroyed, but they are simply changed from one form to another.
Mass of wood burning = mass of ash + mass of CO₂
150G = 30G + mass of CO₂
mass of CO₂ = 150G - 30G = 120G
HELPPPPPPPPPP! I WILL GIVE FREE BRAINLIST!
Answer:
21%
Explanation:
nitrogen takes up more than half so it can't be the 2 biggest answers cause both are more than 50 and the smallest answer would have to be for the little sliver of the pie chart
Answer: 21%
Explanation:
Hanrietta has a sample of a pure substance in a beaker. She heats the substance to a temperature of 100C. What will determine if the substance is a solid, liquid, or gas at 100C? .a. the amount of it that is contained in the beaker
. b. the height of the beaker containing it. c. the width of the beaker containing it. d. the strength of the forces between its atoms
Answer:
d. the strength of the forces between its atoms
Explanation:
The strength of the intermolecular forces between the atoms of the pure substance will determine the type of substance it is when heated to 100°C.
A pure substance are elements and compounds. They are usually homogenous in all parts with a definite composition. A solid is made up of strong intermolecular forces that are very difficult to break. Liquids have fairly weak bonds between them. Gases have little to no intermolecular attraction. Using these parameters, we can see that the property of the substance at this temperature will determine its physical state.Hydrogen bond is not formed by 1) oxygen 2) nitrogen 3) chlorine
PLEASE HELP!!!
Answer:
Input work is the work done on a machine as the input force acts through the input distance. This is in contrast to output work which is a force that is applied by the body or system to something else. Output work is the work done by a machine as the output force acts through the output distance.Jan 15, 2020 bahsgsh bvshgs d hg
Is the following picture an example of a chemical change or a physical change?
SOMEONE PLEASE HELP ILL GIVE brainly
A physical change, because the atoms are rearranging to form new molecules.
A physical change, because the molecules are staying the same.
A chemical change, because the atoms are rearranging to form new molecules.
A chemical change, because the molecules are staying the same.
Boiling water is an example of a physical change and not a chemical change because the water vapor still has the same molecular structure as liquid water (H2O). If the bubbles were caused by the decomposition of a molecule into a gas (such as H2O →H2 and O2), then boiling would be a chemical change
Therefore, your answer would be:
A physical change, because the molecules are staying the same.
Answer:
A physical change because the molec are staying the same
Explanation:
when water is evaporated it still is water just not in liquid form
Write TRUE if the statement is correct and FALSE if the statement is wrong.
___1.Heat depends only on how fast molecules vibrate. ___2.Joule is a unit of heat energy
___3.We measure temperature with a thermometer
___4.The faster molecules vibrate; the more heat they give off.
___5.Temperature measures the average kinetic energy per molecule.
Answer:
true is the answer of first
How many atoms are there in one mole of CH3OH
Answer: 1.44 x 10^25 atoms in 128 grams of CH3OH.
Explanation: To obtain number of atoms, multiply number of moles by the number of molecules per mole.
Explanation:
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Question 14
1 pts
How many moles of NaCl could be found in 0.4 L of a 0.9 M solution? Round your answer to
two decimal places.
Answer:
0.36mol
Explanation:
Given parameters:
Volume of NaCl = 0.4L
Molarity = 0.9M
Unknown:
Number of moles = ?
Solution:
To find the number of moles, the molarity of a solution is the amount of solute contained in a solution.
Molarity = [tex]\frac{number of moles}{volume}[/tex]
Number of moles = molarity x volume
Insert the parameters and solve;
Number of moles = 0.4 x 0.9 = 0.36mol
Which of the following statements about elements and atoms is true?
Answer:
the first one
Explanation:
What product(s) are formed during this chemical reaction? (There will be two correct answers)
Ca + Na3PO3 rightwards arrow
CaNaPO3
Ca3(PO4)2
Ca2(PO4)3
Ca(PO3)2
Na
Na3
CaNa
No Reaction
Answer:
Ca3(PO4)2 and Na
Explanation:
The reaction equation is;
3Ca + 2Na3PO3 -------> Ca3(PO3)2 + 6Na
We must remember that calcium is above sodium in the electrochemical series. This implies that calcium can displace sodium from its solution. Calcium has a reduction potential of -2.87 V while sodium has a reduction potential of -2.71 V. The ion with the more negative reduction potential can easily displace the other in aqueous solution.
This explains why the reaction above is possible.
FePO4 + Na2SO4 Fe2(SO4)3 + Na3PO4
If you perform this reaction with 24 grams of FePO4 and an excess Na2SO4, how many grams of Fe2(SO4)3 can you make?
Mass Fe₂(SO₄)₃ : 31.79 g
Further explanationReaction
2FePO₄ + 3Na₂SO₄ ⇒ Fe₂(SO₄)₃ + 2Na₃PO₄
mol FePO₄ (MW=150,82 g/mol) :
[tex]\tt \dfrac{24}{150.82}=0.159[/tex]
mol Fe₂(SO₄)₃ : mol FePO₄ = 1 : 2, so mol Fe₂(SO₄)₃ :
[tex]\tt \dfrac{1}{2}\times 0.159=0.0795[/tex]
mass Fe₂(SO₄)₃ (MW=399,88 g/mol) :
[tex]\tt 0.0795\times 399,88 g/mol=31.79~g[/tex]
When naming acids the prefix hydro- is used when the name of the acid anion ends in___
Answer:
hydrochloric acid
Explanation:
These anions usually have the ending “-ide.” As acids, these compounds are named starting with the prefix “hydro-,” then adding the first syllable of the anion, then the suffix “-ic.” For example, HCl, which is hydrogen and chlorine, is called hydrochloric acid. More complex acids have oxygen in the compound.
describe the theory of plate tectonics
Answer:
The theory of plate tectonics states that the Earth's solid outer crust, the lithosphere, is separated into plates that move over the asthenosphere, the molten upper portion of the mantle. Oceanic and continental plates come together, spread apart, and interact at boundaries all over the planet.
Explanation:
From Google
An aquifer receives 40 m3 of precipitation and loses 10 m3 of water through natural movement. How much water can be pumped from the aquifer to balance the budget? 10 m3 20 m3 30 m3 40 m3
Answer:
30m3
Explanation:
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The amount of water that can be pumped from the aquifer to balance the budget is 30 m³.
Material BalanceThe principles of material balance states that, the total mass of an isolated system is always conserved.
Mass (in) = Mass (out)
Water pumped from the aquiferThe water pumped from the aquifer can be determined by applying the principle of material balance.
10 + m = 40
m = 40 - 10
m = 30 m³
Thus, the amount of water that can be pumped from the aquifer to balance the budget is 30 m³.
Learn more about material balance here: https://brainly.com/question/15178192
Does anyone know how to write on a pdf file? I have to do an assignment for chemistry, but i don’t know how to write on it through my laptop. I downloaded it but it still doesn’t really let me type or write on it. Help?
Go to the google marketplace and download pdf editor. it's free and it's amazing
Mrs. Franklin loves teaching science and thinks about it all the time. While walking one day, she steps on a warm, fresh piece of used gum. The gum flattens and sticks to her shoe. When she lifts her foot, she sees long strings of gum between her shoe and the sidewalk. She thinks, "What a great demonstration of the properties of metals!"
What properties of metals would Mrs. Franklin most likely teach about with this demonstration?
conductivity and luster
ductility and malleability
malleability and reactivity
conductivity and ductility
Answer:
Ductility and Malleability
Explanation:
Pls mark my answer as brainliest
Answer:
the correct answer is Ductility and Malleability....(B)....
Explanation:
I took the test, hope this helps. also the person above me is correct
According to the periodic table, the neutral atom of what element has 4
protons, 5 neutrons, and 4 electrons?
Answer:
Beryllium
Explanation:
Given parameters:
Number of protons = 4
Number of neutrons = 5
Number of electrons = 4
Unknown:
Element = ?
Solution:
To determine an element, the atomic number is the most important identifier.
The atomic number is the number of protons in an atom.
Since the atom here has a proton number of 4, checking on the periodic table, it is Beryllium, Be
which of these changes could be classified as producing a chemical changes
Answer:
hhhhhhhh
Explanation:
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if we all have atoms and atoms technically never touch then we've never touched anything in our lives. is this true?
Answer:
We are all made out of atoms, yes this is true. And atoms never touch each other. So no sir, i did not punch that little boy.
Explanation:
What are the elements in sodium phosphate?
Answer:
sodium and phosphorus
Explanation:
sodium combines with phosphorus to produce sodium phosphate
Explanation:
I hope understand this
Bobbye wants to know how his speed affect the amount of time it takes to stop at a stop sign. Each time he performs a trial, he will change the speed that he is driving to see how it affects the amount of time it takes to stop. Independent Variable: Dependent Variable: Controlled Variables:
Answer:
The correct answer is -
Independent Variable: change of speed
Dependent Variable: time takes to stop
Controlled Variables: stop at a stop sign
Explanation:
To know the effect of the speed to take the time to stop at a stop sign Bobbye perform this exercise where he changes the speed at each time that he is driving to know the time it takes to stop at a stop sign. There is a change that takes place purposely is in the speed of driving so it is an independent variable as the independent variable is a variable that is manipulated in an experiment or investigation.
The time it takes to stop is the factor that depends on the speed so it is the dependent variable as the dependent variable is the variable that depends on the independent variable.
The control variable remains the same or constant in an investigation which is stoping at a stop time irrespective of speed.
Write the net ionic equation for the following reaction:
AgC2H3O2(aq) + CaCl2(aq) →
Answer:
2Ag^+(aq) + 2Cl^-(aq) --------> 2AgCl(s)
Explanation:
The net ionic equation reflects the main reaction that occurred in the system. It tells you the most important reaction that took place.
If we first put down the balanced molecular equation for the reaction, we have;
CaCl2(aq) + 2 AgC2H3O2(aq) ---------> 2 AgCl(s) + Ca(C2H3O2)2 (aq)
The net ionic equation is;
2Ag^+(aq) + 2Cl^-(aq) --------> 2AgCl(s)
consider the following reaction: Mg(s)+2HCl(aq)--->MgCl2(aq)+H2(g) the total pressure of gas collected over water is 650.0 mmhg and the temperature is 19.0 c. what is the pressure of hydrogen gas formed in mmHg
Answer:
633.5
Explanation:
The total presser is 650.00 mmHg, and it is collected over water, which at 19c is 16.5 mmHg. Therefore, to get the total pressure of H2 you would subtract the partial pressure of water from the total pressure.
650-16.5=633.5
633.5 mmHg is the pressure of hydrogen gas formed in mmHg.
According to the Dalton's law of partial pressure, the total pressure of a gas mixture is the sum of all the partial pressure of the individual gases present in the mixture of gases.
Hence;
Total pressure = pressure of hydrogen gas + vapour pressure of water
pressure of hydrogen gas = Total pressure - vapour pressure of water
vapour pressure of water at 19°C = 16.5 mmHg
pressure of hydrogen gas = 650.0 mmHg - 16.5 mmHg
pressure hydrogen of gas = 633.5 mmHg
Learn more: https://brainly.com/question/14281129
why is an atom regarded as electrically unstable
Answer: An atom can be considered unstable in one of two ways. If it picks up or loses an electron, it becomes electrically charged and highly reactive. Such electrically charged atoms are known as ions. Instability can also occur in the nucleus when the number of protons and neutrons is unbalanced.
Explanation:
Whats Potassium bond type? Please help!
Answer:
A metallic bond.
Explanation:
Potassium is a metal (alkali metal), hence its bonds are metallic bonds.
Hope this helped!
Answer:
metallic bond............
im not sure for this one please help me
Answer:
Fairly certain it is the tension of the string
Answer:It would be C
Considering the passage about crude oil, why is distillation the main process for separating the contents of crude oil? Crude oil is a homogeneous mixture. Crude oil is a heterogeneous mixture A major byproduct of crude oil is gasoline.
Answer:
Crude oil is a homogeneous mixture.
Explanation:
I got it right.
Answer: Crude oil is a homogeneous mixture.
Explanation: im doin edge