What does “like dissolves like” mean?
a
solvents dissolve chemicals with the same color (ex. both are green)
b
solvents dissolve chemicals made by the same company (ex. both made by Dow)
c
solvents dissolve chemicals with the same polarity ( ex. both are polar)
d
solvents dissolve chemicals with the same size (ex. both are 3 inches)
Answer:
c solvents dissolve chemicals with the same polarity ( ex. both are polar)
Explanation:
Like dissolves like is one of the central rule that guides the solubility of one substance in another.
It fully suggests substance having the same nature as in polarity-wise will dissolve one another. For example, water is a polar liquid, it will dissolve table salt because it i also polar. Water cannot dissolve oil because oil is non-polar.Which of the following would be considered a derived unit? A) length B mass C) density D) temperature
Answer:
density because it S.I unit is derived from fundamentals
_______forces do not affect the movement of an object.
A gas has a pressure of 65.0 mmHg at 740K. What will be the pressure at 300K if the
volume does not change?
Answer:
26.35 mmHg
Explanation:
Given data:
Initial pressure = 65.0 mmHg
Initial temperature = 740 K
Final temperature = 300 K
Final pressure = ?
Solution:
According to Gay-Lussac Law,
The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.
Mathematical relationship:
P₁/T₁ = P₂/T₂
Now we will put the values in formula:
65 mmHg / 740 K = P₂/300 K
P₂ = 65 mmHg× 300 K / 740 K
P₂ = 19500 mmHg. K /740 K
P₂ = 26.35 mmHg
water traveling in a circular motion when heating up a example of
A. Conduction
B. Convection
C. Radiation
D.none of these
Answer:
B.convection
Explanation:
Convection is the circular motion that happens when warmer air or liquid — which has faster-moving molecules, making it less dense — rises, while the cooler air or liquid drops down
pb3(po4)2 compound name
Answer:
Lead phosphate
Explanation:
Pb3(po4)2 has the compounded name of lead(II) phosphate.
What is lead(II) phosphate like ?It is a white, crystalline solid that is insoluble in water. Lead(II) phosphate is used in some paints and plastics, and it is also used as a pigment.
The name of the compound is based on the oxidation state of the lead atom. Lead can have two oxidation states, +2 and +4. In Pb3(PO4)2, the lead atom has an oxidation state of +2, so the compound is named lead(II) phosphate.
The phosphate ion has an oxidation state of -3, so there are two phosphate ions in the compound to balance the +6 charge of the three lead atoms.
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Which organic molecule is not considered a polymer? *
1 point
O nucleic acids
carbohydrates
O lipids
O proteins
Answer:
Lipids
Explanation: Lipids are, in fact, the only non-polymer organic molecules.
How could you explain why soap is able to clean the oil and dirt off your bodies?
Answer:
When you wash your hands with soap, it dislodges the dirt, grease, oils, and disease-ridden fecal matter particles on your hands by creating these micelles. Surrounded by the soap, the oil molecules become suspended and distributed in the water rather than stubbornly clinging to your skin.
Explanation:
When a piece of sodium metal is kept in water in chemical equation
Explanation:
Sodium metal reacts rapidly with water to form a colourless basic solution of sodium hydroxide (NaOH) and hydrogen gas (H2). The reaction continues even when the solution becomes basic. The resulting solution is basic because of the dissolved hydroxide.
Explanation:
Sodium metal reacts rapidly with water to form a colourless basic solution of sodium hydroxide (NaOH) and hydrogen gas (H2).
Metal X displaces metal Y. Metal Z does not react with X or Y. What is the correct order of decreasing reactivity for metals X, Y, and Z?
Answer:
Metals on top of the activity series can displace metals at the bottom and they are highly reactive as compared to metals at the bottom of the series.
Hence, the order is X>W>Y>Z.
What type of reaction is shown here?
SeCl6+O2 , SeO2 + 3Cl2
O Single replacement
O Combustion
O Double replacement
O Synthesis
O Decomposition
Answer:
Depends since Chemical equation is not written clearly...
Explanation:
if if the comma represents an equal sign then I would assume that this would be a single replacement... however if this is all one equation I would assume it is a double replacement.
The type of chemical reaction shown in the question is a: A. Single replacement.
A chemical reaction can be defined as a chemical process involving the continuous transformation (rearrangement) of either the ionic, atomic or molecular structure of a chemical element, especially through the breakdown and formation of chemical bonds, in order to produce a new chemical compound.
In Chemistry, there are five (5) main types of chemical reaction and these include;
Combination reaction.Combustion reaction.Double-replacement reaction.Decomposition reaction.Single-replacement reaction.A single-replacement reaction is also referred to as a single-displacement reaction and it can be defined as a type of chemical reaction wherein a single (one) chemical element of the reacting chemical compound is replaced (substituted) by a similar chemical element.
Basically, a single-replacement reaction typically involves a single element ([tex]O_2[/tex]) replacing another element ([tex]Cl_6[/tex]) within a chemical compound ([tex]SeCl_6[/tex]).
[tex]SeCl_6+O_2[/tex] ----> [tex]SeO_2 + 3Cl_2[/tex]
In conclusion, the above chemical reaction is a single-replacement reaction because oxygen gas replaces the chlorine molecules in selenium hexachloride.
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Please help!!! I can’t figure it out!
Answer:
The third answer
Explanation:
3
1. The observed regularities in the properties of
the elements are periodic functions of their
(1) atomic numbers
(2) mass numbers
(3) oxidation states
(4) nonvalence electrons
Answer:
(1) atomic numbers
Explanation:
The observed regularities in the properties of the elements on the periodic table are periodic functions of their atomic numbers.
Atomic number is the number of protons in an atom. The periodic law states that "the properties of elements are a periodic function of their atomic number".Elements on the periodic table are arranged based on the atomic numbers they contain. The number of positively charged particles in an atom is the atomic number.The observed regularities in the properties of the elements are periodic functions of their atomic numbers.
Modern periodic law states that "Properties of elements are a periodic function of their atomic number not by their atomic mass". Modern periodic law was proposed by Henry Moseley in 1913. Physical and chemical properties of elements depend on the number of electrons and their arrangement.
Thus properties of elements are periodic function of their atomic numbers and not atomic masses. If the properties of an element depend on number of proton and neutron then the properties are periodic function of their atomic mass so we can conclude that the observed regularities in the properties of the elements are periodic functions of their atomic numbers.
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who ran the control room chernobyl part 1
I WILL GIVE A LOT OF EXTRA POINTS. PLEASE ANSWER ALL OF THEM
75 for all
Explanation:
Answer:
Explanation: Li= Lithium, Na= Sodium, K= Pottasium, Rb= Rubdium Cs= Cesiuna, Fr= Fransium
6. Energy levels increases as if you move down a group during the number of electrons increases again.
7. A charge with higher and effective nuclear charge makes greater attractions to the electrons, pulling the electrons cloud closer to the nucleus makes it in a smaller atomic radius.
8. Ge= Germanium, He= Helium, O=Oxygen, Barium
Will mark brainliest for who is right
Which properties change the composition of a substance?
chemical and physical properties
neither chemical nor physical properties
physical properties
chemical properties
A teacher showed this animal to students on a field trip which tool will allow the students to best see the animal up close
Answer:
Magnify glass
What type of clothing would you need to wear if you could visit the mesosphere
The type of clothe that you would wear when visiting the mesosphere are the winter clothes.
What is mesosphere?Mesosphere is used to describe the coldest part of the earth whose temperature is -85°C.
An individual that wants to visit such a cold area should wear clothes that would provide such with warmth such as the winter clothes.
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What does it mean when there is a physical change?
Question 1 options:
A new substance has been formed.
Matter has changed size, shape or form.
Matter has changed from one substance into another.
Matter has changed on the molecular level.
Answer:
The matter has changed size, shape, or form.
Explanation:
A new substance that is formed is creation.
if the matter changed from one substance to another this is called a chemical reaction.
Surely not. It won't change the molecular level.
Hope that helps.
What happens to the energy release of an exothermic reaction?
1.It increases the bond energy of the reactants.
2.It is released to the surroundings.
3.It raises the temperature of the reactants.
Answer:
2.It is released to the surroundings.
Explanation:
In an exothermic reaction, the energy released is to the environment. At the end of the reaction, the surrounding becomes hotter than the system where the reaction is taking place.
Heat is liberated to the surrounding in an exothermic change. At the end of this change, the surrounding becomes hotter. Examples are combustion, dissolution of substances, etc.Which structure is a valid representation of a hydrocarbon molecule?
Im pretty sure it is the first one
Use this diagram to answer the following
questions.
a
7 Identify Is this an atom or a molecule?
Explain your reasoning.
THIS IS ACTUALLY SCIENCE NOT CHEMISTRY
Answer:An atom
Explanation:
Because molecules more spread out and have things that connnect them and are not bunched up togoether
And Atoms are all packed up like in the picture
Hope this helps!:D
The diagram shown is that of a molecule as it is made up of two different kinds of atoms.
What is an atom?
An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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Please help any expert be sure your 100% correct please THANK YOU SO MUCH! ANY TEACHER PLEASE HELP!! THIS IS SCIENCE PLEASE EXPLAIN IT TO ME!!!
The molecule
found in paper is almost identical to the
carbohydrate molecule found in mashed
potatoes.
glycogen
chitin
cellulose
Answer:cellulose
Explanation:
I just did it.
Which best describes the current model of the atom?
O A a central nucleus containing protons with electrons orbiting in specific paths
O B. a solid sphere unique for everything that exists
O c a solid sphere with electrons and protons embedded
O D. a central nucleus containing protons and neutrons with electrons orbiting in levels of high probability
Explanation:
i think the answer might be D
A population of panthers lives in the southeastern United States. Over 50 years, the size of the panther population in the region increased. What best explains the increase in the size of the panther population?
Explanation:
Because the panthers live in the southeastern region of the United states they have increased in population in that region. They have been able to gain more food and have adapted more to there environments. Which allows to increase and reproduce more. That is why the Panthers in the southeastern United states have increased In population. I hope this works for you and that it helps. I don't mind helping someone who has a question! From, me.
A population of panthers lives in the southeastern United States. Over 50 years, the size of the panther population in the region increased. More panthers were born than died explains the increase in the size of the panther population.
What is the largest panther in the world?The jaguar, also known as the panther, tigre, or onza, is the world's largest and most powerful cat. Human activities endanger this cat, as they do the Florida panther (Puma concolor).
Because the anteater population will have fewer energy storage molecules available due to the smaller ant population, the anteater population will reproduce less.
Panthers can be found in the southeastern United States. The region's panther population has grown over the last 50 years. Because no animal eats panthers, the panther population is always growing.
Thus, More panthers were born than died explains the increase in the size of the panther population.
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Describe the ammonium ion, NH4+, and the sulfate ion, SO42-. What compounds would these ions form with potassium and fluoride ions? Write the formula units for the resulting compounds.
Explanation:
Ammonium Fluoride and Potassium Sulphate
Which of the following represents the chemical reaction of benzene and nitric acid to produce nitrobenzene and water?
Answer:
D
Explanation:
i mean it's just taking the words of the question and putting them into an equation
[tex]\huge\boxed{Option C}[/tex]
_____________________________________Equation:Benzene + Nitric Acid ---------> Nitrobenzene + water_____________________________________Explanation:As per Question,
It is saying that Benzene(organic compound) reacts with nitric acid. So,
Benzene and Nitric Acid are Reactants,
Nitrobenzene is the Product.
_________________________________________________________
General way of showing the reaction is,
Reactants --------> ProductIn the following Question,
Benzene is Reactant no. 1,
Nitric Acid is Reactant no.2,
Nitrobenzene is Product no 1,
Water is a By Product.
_____________________________________Best Regards,'Borz'what is hard water and what causes hardness of water
Answer:
hard water is ice
Explanation:
ice is formed as the water temperature decreases and then it freezes
Calculate the mass of 0.100 mol of calcium
Answer:
4.01 g
Explanation: