A student uses red litmus paper to test the pH value of different solutions. Which would result in a color change of the litmus paper?
soap
vinegar
lemon juice
antifreeze
Answers
The litmus paper shows red colour for acidic substances and blue colour for basic substances. Thus a red litmus paper will turn blue if it is dipped in an alkaline solution. Soap is alkaline and given blue color to litmus.
What is pH?pH of a substance is its measure of concentration of H+ ions in it. It is mathematically negative logarithm of H+ ion concentration. Thus, pH measures how much acidic or basic the solution is.
A pH of of 7 is neutral having no acidity or basicity. A pH less than 7 is acidic and pH greater than 7 is basic in nature. Vinegar is acetic acid and it shows less pH . Lemon juice also acidic since it contain citric acid whereas, soap is basic.
A litmus paper is used to identify whether a substance is acidic or basic. It shows red color for acidic solutions and blue for basic solutions. If the red litmus paper is dipped in acidic one, it shows no colour change if it is dipped in basic solution then it turns to blue.
Soap is highly alkaline and it changes red litmus paper to blue.
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Related Questions
Is there a relationship between cohesion and volume?
Answers
HELP MEEEEEEEEEEEEEEEEEEEEEEEEEE
Answers
Figure 1- decomposer
Figure 2- autotroph/producer
Figure 4- heterotroph/ consumer
Figure 6- decomposer
please help me 7th grade science
When a chemical reaction occurs, what happens to the atoms of the two substances? Provide an example from the Sim (on Amplify) as evidence to support your answer.
When a chemical reaction does not occur, what happens to the atoms of the two substances? Provide an example from Sim as evidence to support your answer.
Answers
An example of this can be seen in the Sim on Amplify, where students can experiment with different chemical reactions. For instance, in the "Chemical Reactions" Sim, students can explore the reaction between iron and sulfur to form iron sulfide. In this reaction, the iron atoms and sulfur atoms combine to form a new compound, iron sulfide, with different properties than the original iron and sulfur. The atoms of the iron and sulfur are rearranged to form new bonds, resulting in the formation of a new substance. This is an example of a chemical reaction, where the atoms of the two substances are rearranged to form a new compound with different properties.
Answer:
Explanation:A chemical response is a chemical transformation in which two chemicals combine to create a third component.
(i) Adding diluted acid to an active metal causes the test tube to heat up and hydrogen gas to escape, which results in the production of heat.
(ii) When diluted hydrochloric acid is added to silver nitrate, AgCl, a white precipitate, results.
(iii) When water is added to quicklime, the mixture boils and produces heat along with a hissing sound.
(iv) Thermal breakdown of mercury oxide - Mercury turns from red to a metallic silver tint as a result of this process.
Which of the following was a major focus of the Mississippian belief system?
physical connection
an anointed leader
a single deity
spiritual connection
Answers
Answer:
i think answer is spiritual connection
G
A substance occupies one half of an open container. The atoms of the substance are closely packed but are still
able to slide past each other.
What is most likely the phase of the substance?
gas
liquid
solid and gas
O liquid and solid
Mark this and return
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Submit
Answers
Answer:
Solid and gas
Explanation:
Oil is a powerful source of energy used for cars, machines, and many other purposes. While studying sources of energy that could replace the use of oil, a student thinks about solar power, wind power, nuclear power, and electric batteries. The students asks,"Which type of source will waste the least energy and provide the most energy in all situations?"
Which best describes why a scientist would ask a different question than this one?
O The question asks about subjective personal preferences regarding energy.
O The question focuses on the objective measurements of amounts of energy.
O The question has too wide of a focus, as though all situations can be studied at once.
O The question is focused on the future and finding new answers about changing needs.
Answers
Answer:
C
Explanation:
scientists usually focus on one specific problem, rather than a whole range. so the answer would be that it's too wide a focus.
btw this is where the crown is on the bottom of the question
Answer:
c
Explanation:
In this cellular respiration process, some chemical bonds between atoms in oxygen and glucose molecules are _____. As atoms are rearranged, new chemical bonds are _____ between different atoms to produce carbon dioxide gas and water. This process releases energy.
The blank options are broken, and formed.
IXL N.2 7th Grade Science
Understanding the chemistry of cellular respiration
Answers
Answer:
In this cellular respiration process, some chemical bonds between atoms in oxygen and glucose molecules are broken. As atoms are rearranged, new chemical bonds are formed between different atoms to produce carbon dioxide gas and water. This process releases energy.
In this cellular respiration process, some chemical bonds between atoms in oxygen and glucose molecules are broken. As atoms are rearranged, new chemical bonds are formed between different atoms to produce carbon dioxide gas and water. This process releases energy.
what is the awnser??? (pic is below)
Answers
Answer:
C: Radiation. Arrow x shows radiation. I hope this helps u! If it's wrong, please let me know!!
Solve and whoever get it right first gets brainlest
Breanna is investigating the changes in various solids as they are heated. She places four unknown solids into individual test tubes and heats them at the same rated. She records her observations after 0, 10 and 20 mins.
Answers
Answer: well it wouldbe 10 min
Explanation:
What is the charge on the Cr in Cr2O72-
Answers
Answer:
+6.
Explanation:
So, a chromium atom here has an oxidation number of +6.
Zavia climbed a mango tree to get the ripest mangoes. He got stung by a bee. What do you suggest for Zavia to put on the bee sting for neutralization to occur?
1 Ice
2 Baking soda
3 Benadryl
4 Vinegar
Answers
Answer:
Baking soda
Explanation:
1 ice
2 baking soda
3 Benadryl
4 vinegar
The answer is baking soda
Occurs when the particles in one part of an object _____________ more and ____________ with ______________ particles, making them ______________ ______________.
Different _______________ conduct ___________ at different ___________. ____________ are generally good conductors of heat compared to ______________ (paper, wood, plastics).
____________ are better conductors then liquids because _________________ in solids are ______________ _______________.
Answers
Occurs when the particles in one part of an object vibrate more and collide with neighboring particles, making them transfer energy.
Different materials conduct heat at different rates. Metals are generally good conductors of heat compared to non-metals (paper, wood, and plastics).
Solids are better conductors than liquids because the particles in solids are tightly packed together.
What is thermal energy?Thermal energy is the energy associated with the random motion of particles in a substance. It is a form of kinetic energy created from the vibrational and rotational motion of atoms and molecules in a substance.
All objects contain thermal energy and when two objects of different temperatures are in contact, heat flows from the hotter object to the colder object until they reach a state of thermal equilibrium. Thermal energy is used in many applications such as heating, cooling, and even cooking food.
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help me with this I only have one more
1156 g/L
= ________ kg/mL
Answers
The Answer is 0.001156.
1156 g/L = 1.156 kg/L
Since 1 L is equal to 1000 mL, we can convert kg/L to kg/mL by dividing by 1000:
1.156 kg/L = 1.156/1000 kg/mL
1.156/1000 kg/mL = 0.001156 kg/mL
Therefore, 1156 g/L is equal to 0.001156 kg/mL.
The corn crop in an area is prone to infestation by larvae from moths that feed on the cornstalks and ears of corn. The techniques used by two farmers to protect the corn crop are described below.
Technique A: Sprayed his corn crop with an insecticide. The insecticide is known to kill all honeybee, butterfly, and moth larvae.
Technique B: Used a genetically modified variety of corn. The plant produces an insecticide which selectively kills only the moth larvae as it feeds on the corn.
Which technique is likely to have less of an impact on the environment?
Technique B because it may help humans who consume corn to fight bacteria
Technique A because it kills a broader variety of insects to protect the corn
Technique B because it preserves the harmless insects and targets only the moth larvae
Technique A because insecticide use is better for preserving the environment.
Answers
Answer:
Its C
Explanation:
Method A puts a type of spray that kills bees plus butterfly's which would make their population decrease. Which isnt helpful and harms the enviroment a lot. Answer A dosent make sense it may be harmful
Answer: c
Explanation:
I took the quiz
Where is the DNA stored in a cell?
Answers
Answer: nucleus
Explanation:
Please help im in a rush and im at therapy so i need to finish this
What is a mixture?
Answers
Answer:
In chemistry, a mixture is a material made up of two or more different substances which are not chemically combined. A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions and colloids.
Explanation:
I hope this helps. ^_^
Mixture
Explanation:
A mixture is created when two or more different substances are physically combined and can be separated back into its original substances.
example- a pile of different kinds of leaves
hope it helps!
The current atomic model has a. A.clear and exact placement for every electron around the nucleus of an atom. B.clear and distinct border surrounding the nucleus of an atom where electrons are located. C.predicted area surrounding the nucleus where the electron could be located.
Answers
The Bohr model used to be used but it signifies that electrons stay stationary. The current model uses electron clouds in order to predict the location of an electron within an atom.
Additionally, we can predict the location of an electron, but we cannot exactly pinpoint it. So, the current atomic model cannot have a clear and exact placement for every electron around the nucleus of an atom. It also cannot have a clear and distinct border surrounding the nucleus of an atom where electrons are located.
Therefore, the current atomic model has a predicted area surrounding the nucleus where the electron could be located.
Please help me por favor :'(
Answers
Write a scientific argument that addresses the question: Which suspect is most likely to have made the hydrofluoric acid? First, state your claim. Then, use evidence to support your claim. For each piece of evidence you use, explain how the evidence supports your claim. As you write, refer back to your completed Modeling Tool sheets and Science Seminar Evidence Cards.
We need 2 reasons why its either Pat or Tracy. I need a paragraph on it.
ILL GIVE BRANLIEST TO THE BEST ANSWER THATS A PARAGRAPH AND GIVES 2 REASONS WHY ITS EITHER PAT OR TRACY!!
Answers
Answer:
Pat is most likely to have made the hydrofluoric acid.
Explanation:
How is hydrofluoric acid made?
It is manufactured by heating purified fluorspar (calcium fluoride) with concentrated sulfuric acid to produce the gas, which is then condensed by cooling or dissolving in water. ... The acid hydrolysis of fluorite-containing minerals generates an impure gas stream consisting of sulfur dioxide, water and HF.
that's all I got sorry
The argument regarding hydrofluoric acid.
The scientific community has made an argument that addresses the to questions of the suspect how likely it's for the formation of the hydrofluoric acid.
The statement is given as per the claims that support them. the answer. Hydrofluoric acid is an solution in the hydrogen fluoride in water and they are colorless.
Thus answer is Pat has made hydrofluoric acid.
As per the table, the police have to identify the suspect that has made the acid and was ordered from a local chemical supply company that makes the acid. The work of pat as a sculptor is to make sulphuric acid and calcium fluoride.The substance is a string, is a string, and is colorless and a liquid at room temperature. Hence pat is responsible for making s er the modeling tool sheet.Learn more about the scientific argument.
brainly.com/question/16625756.
What might happen if there is excessive water removal from the Central Valley Aquifer in California?(1 point) Responses
A. It can cause severe weather changes in California.
B. It can cause severe weather changes in California.
C. It can transform California completely to a desert.
D. It can transform California completely to a desert.
Answers
Answer:
A
Explanation:
California is surrounded by the sea so it would never run out.
which phrase describes air pressure O decreases with denser air O decreases as altitude decreases O equals mass divIded by Volume O decreases as a result of fewer air particles pushing down
Answers
Air pressure decreases as altitude decreases. This phenomenon occurs because the atmosphere's density diminishes with increasing height above the Earth's surface and the correct option is option 2
As one ascends to higher altitudes, there are fewer air particles above, leading to a decrease in air density. Consequently, the pressure exerted by the air decreases at higher elevations.
Conversely, at lower altitudes, the air is denser due to the larger number of air particles above, resulting in higher air pressure. This relationship between air pressure and altitude is crucial for understanding weather patterns, climate changes, and the functioning of various natural processes on Earth.
Thus, the ideal selection is option 2.
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Which will settle out if allowed to sit on a table?
a suspension
a colloid
a solution
a compound
Answers
Answer:
The correct answer is 'suspension'.
Explanation:
Suspension are the mixture :
When kept undisturbed solute particles get settled in the bottom of the container. Two different layers can be seen from the eyes.
Solute particles doesn't dissolves in solvent.
It is a non uniform mixture.
Size of solute particles are larger than 1000 nano-meter.
Your Welcome
Science questions answer to get 20 points
Answers
Answer: (Q1) B. (Q2) D. (Q3) B. I believe (Q4) C.
Explanation: (Q3) B the medulla isn't playing a physical part in digestion as much as it controls the process this is a educated guess
Which of these best describes Earth's mantle? (3 points)
a
Most dense layer, consists of the outer and inner parts
b
Thinnest under the oceans and thickest under continents
c
Middle layer, density increases with depth as pressure increases
d
Least dense layer overall, consists of two layers of different thickness
Answers
Answer:
the answer you are looking for is A
Explanation:
Earth's core is the most dense layer and it consists of the outer core and the inner core.
what is the function of the two microscope lenses?
Answers
Lewis is running in a race. His muscles need oxygen. Which best describes how multiple systems interact to bring him into homeostasis? The circulatory stem brings oxygen to the respiratory system, which delivers oxygen to the muscular system. The respiratory system brings oxygen to the circulatory system, which delivers oxygen to the muscular system. The respiratory system brings oxygen to the circulatory system, which delivers oxygen to the skeletal system. The circulatory system brings oxygen to the respiratory system, which delivers oxygen to the skeletal system.
Answers
the respiratory system brings oxygen to the circulatory system, which delivers oxygen to the muscular system
In an electrical wire, if instead of copper, plastic wire is used. Would it conduct electricity?Justify your answer.
Answers
Answer:
No, a plastic wire would not conduct electricity. This is because plastic is an insulator that does not allow electric current to flow through it. In a wire, electrical conductivity is provided by the movement of charged particles - typically, electrons. Copper is an excellent conductor of electricity because it has a high number of free electrons that are not bound to atoms and can move through the wire very easily. However, in a plastic wire, the tightly bound electrons of its atoms do not allow for the free flow of charges, thus preventing the passage of electric current.
Why do you think the older scientist disregarded the younger scientist's prediction?
Answers
This is not true at all the younger and oldest scientist are equally as important. Just giving an example of what the older scientist might have thought.
If a solution has a pOH of 8.71, what is the [H+]?
Answers
Answer: \(5.1\times 10^{-6}M\)
Explanation:
pH or pOH is the measure of acidity or alkalinity of a solution.
pH is calculated by taking negative logarithm of hydrogen ion concentration.
\(pH=-\log [H^+]\)
\(pH+pOH=14\)
Putting in the values:
\(pH=14-8.71=5.29\)
\(5.29=-log[H^+]\)
\([H^+]=5.1\times 10^{-6}\)
Thus \([H^+]\) is \(5.1\times 10^{-6}M\)
Adaptations come from which of the following over time... * *
A: hard work by the organism
B: genetics, mutations over time.
C: gifts from friends
D: the organism trying to change themselves overnight
Answers
Answer:
B
Explanation:
Genetics,mutations over time
This is the answer because on biology you have all those kind of questions
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