Answer:
cutting of an apple is both physical and chemical change
because cutting a apple, the size and shape of the apple changes. it will be a chemical change because after cutting an apple, the color apple changes when left open
write the formulas of alkanes that contain three, five, seven, and nine carbon atoms
Answer:
Explanation:
Name Number of Carbon Atoms Molecular Formula
methane 1 CH4
ethane 2 C2H6
propane 3 C3H8
butane 4 C4H10
Which sequence is used to separate a soluble salt from a mixture of a soluble and an insoluble
salt?
A
add solvent, heat the mixture, crystallise the mixture
add solvent, heat the mixture, filter, crystallise the filtrate
B
C
heat the mixture, filter, crystallise the filtrate
heat the mixture, filter, add solvent, crystallise the filtrate
D
Calculate the number of moles of alkali in 25cm3 of NaOH solution used.
Answer:
0.001mol
Explanation:
volume (NaOH) =25cm³ =0.025dm³
molar volume = 22.4dm³
n = V = 0.025 = 0.001mol
Vm 22.4
Gravity relates to a stream's ability to erode and deposit material by causing water to flow faster down a steep slope. True or False
Answer:
true
Explanation:
Which of the following properties is a chemical property?
Answer:
flammability, toxicity, acidity, reactivity are some examples.
sorry you left out your options.
Answer:
Where are the options
Explanation:
Can you be a little more specific about your question?
NEED HELP ASAP. Write a statement explaining your claim about whether or not the equation is correctly balanced.
Then, provide evidence that supports your claim about whether or not the equation is correctly
balanced. Next, connect your evidence to your claim about the equation.
Answer:
Explanation:
Hi! can you add the choices.
Metals are good conductors of current.
Answer:
absolutely correct....................
which statement best describes what occurs during a chemical reaction?
a) the bondsman reactants break so that elements can rearrange down form new products
b)bonds within the nucleus of reactants atoms are broken and rearranged to form new product atoms
c) the bonds and products break so that elements can rearrange and form new reactants
d)reactants atoms are destroyed releasing energy which is used to create new product atoms
Answer:
bonds within the nucleus of reactants atoms are broken and rearranged to form new product atoms
Give two other examples each to acidic and basic oxides
Answer:
Acidic oxide, so², So³, Co², Cl²O7
Basic oxide: CaO, MgO, Na O
Explanation:
An oxide that combines with water to give an acid is termed as an acidic oxide. The oxide that gives a base in water is known as a basic oxide.
What evidence is there to support the theory that strong nuclear force is greater than electromagnetic force?
A: Electrons are attracted to protons.
B: Protons repel other protons.
C:The nucleus holds the protons together.
D:Protons and neutrons are attracted to each other.
Answer:
The electromagnetic force is a long range force which acts of charged particles. Like charges repel and unlike charges attract. ... The strong nuclear force is very short range and can only bind adjacent protons and neutrons. The electromagnetic force is long range.
Explanation:
how does the advancement of medical technology increase the number of medical ethical issues that arise?
Answer:
People are getting richer and richer as technology advances, this may make it so that some people are getting treated unfairly. Signs of little money may support the reason that you are not getting the help you need; this means that health problems would arise more, resulting in an unfair lifestyle.
what is responsible for changes in the state of matter?
and how are
the molecules of a liquid different from that of a solid? PKSS HELOOOÑLPPPP
Answer:
Temperature and pressure are the two factors which are responsible for change in state of matter.
Solid – In a solid, the attractive forces keep the particles together tightly enough so that the particles do not move past each other. ... In the solid the particles vibrate in place. Liquid – In a liquid, particles will flow or glide over one another, but stay toward the bottom of the container.
Hope this helps, mark as Brainliest please...
How do anion formation and valence electrons relate?
Answer:
Atoms gain valence electrons to form anions.
Explanation:
Someone pls help me I will make you brain
Answer:
the second answer
Explanation:
Answer:
A Erosion of structures and buildings
Explanation:
6. Potential energy can be
transformed into kinetic energy
of force is applied to the object.
True or false?
Answer:
true
Explanation:
because there is love in the universe and we converse in each others mind soul brain time stone
What are the most common sources of nitrates that lead to unhealthy water systems
Answer:
Sources of nitrate that can enter your well include fertilizers, septic systems, animal feedlots, industrial waste, and food processing waste.
Help! Will go be brianleist
Answer:
d
Explanation:
Answer: c
Explanation:
Each mineral group has a distinctive chemical feature such as
a. oxides are a metal combined with oxygen
b. sulfides are a metal combined with sulfur and oxygen
c. halides are a salt combined with a metallic atom
d. phosphates are made of phosphate polygons
Answer:
A
Explanation:
What reasons did the Pilgrims give for creating the Mayflower Compact?
to create a colony, establish a new church, and provide a long life for their children
to organize a new nation and create order, and for financial gain
to organize themselves, guarantee a long life for the colony, and achieve their goals in setting up the colony
“[To] Combine ourselves together into a Civil Body Politic, for our better ordering and preservation and furtherance of the ends aforesaid”
—Mayflower Compact
Answer:
To organize a new nation and create order and for financial gain.
Answer:
C the person above is wrong its
Explanation:
to organize themselves, guarantee a long life for the colony, and achieve their goals in setting up the colony
Explanation:
a person dies, and within hours, the skeletal muscles develop a locked contraction known as rigor mortis. calcium ions leak from the sarcoplasmic reticulum into cytoplasm. from your knowledge of cross bridge cycling, what best explains this rigor?
Rigor mortis is the stiffening of the body after death. After death, the body begins to get cold. From about two to six hours after death, the muscles start to stiffen, probably because the actin and myosin filaments of the muscle slide into each other. The rigor mortis starts at the eyelids, jaw and neck and then slowly spreads to all parts of the body within six hours.
Contrary to popular belief, rigor mortis will occur more quickly in high ambient temperatures than in cold conditions. This is because the underlying chemical reaction occurs faster at higher temperatures.
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Someone pls help me I will make you brain
Answer:
Thanks but I already have a brain LOL.
Your answer is D cooler temperatures.
Melting permisfrost actualy is a source of greenhouse gas because it realeses water which could in turn be vaporized eventualy.
NO LINKS PLS HELP I WILL MARK THE BRAINIEST ANSWER
Answer:
Option a
Explanation:
simple
Answer:
The two solutions do not react with each other unless the water is boiled off, then the two will decompose.
Explanation:
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[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]
1. The equation representing the equation is ~
[tex] \mathrm{Na + Cl\rightarrow NaCl}[/tex]
The given reaction is a redox reaction because there's a transfer of electron from Sodium (Na) to chlorine (Cl)
where sodium is oxidized (due to loss of electron) and chlorine get reduced (due to gain of electron).
2. Sodium is a highly reactive element which belongs to the 1st group of periodic table, hence it can catch fire if it is kept free in atmosphere. so in order to prevent that it is stored in kerosene oil, which doesn't let Sodium come in contact with air .
Which of the following elements has the smallest atomic radius?
Group of answer choices
Nitrogen
Oxygen
Fluorine
Carbon
Answer:
Fluroine
Explanation:
Answer:
Fluorine
Explanation:
Nitrogen atomic radius: 155 pm
Oxygen atomic radius: 152 pm
Fluorine atomic radius: 147 pm
Carbon atomic radius: 170 pm
Therefore, fluorine has the smallest atomic radius.
Unless otherwise instructed, you may refer to the periodic table in the Chemistry: Problems and Solutions book for this question.
Which element belongs to the p-block?
cobalt
oxygen
rubidium
hydrogen
is it true or false when the there are too many protons making the nuclei unstable, it will undergo a positron decay and a proton will turn into a neutron.
Answer:
True
Explanation:
As the number of protons in the nucleus increases, the number of neutrons needed for a stable nucleus increases even more rapidly.
which two particles would be attracted to each other?
Answer: protons and electrons.
Explanation:
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ANSWER ASAP PLS??????????????
Answer:
I believe it's A.
Explanation:
Answer:
option C
Explanation:
There are 2 types of changes
Physical change :- The physical properties are changed and its temporary.Chemical change :- The chemical properties are changed and its permanent.Which hybrid orbitals overlap to form the sigma bonds between the indicated atoms in xanthine?
Many nitrogen and carbon atoms can be found in the structure of a heterocyclic molecule called xanthine, which is present in many biological systems.
The development of a sigma bond between these atoms is an essential component of its binding. A special example is the sigma bond between the nitrogen atom and the neighboring carbon atom. In the context of this sigma bond, the hybridization state of nitrogen can be either [tex]\rm sp^2[/tex]or [tex]\rm sp^3[/tex], and the hybridization state of carbon can be [tex]\rm sp^3[/tex]. A sigma bond is formed when the hybrid orbitals of carbon and nitrogen, which are each [tex]\rm sp^2[/tex] hybridized and [tex]\rm sp^3[/tex] hybridized, overlap. A strong covalent bond can develop when the [tex]\rm sp^2[/tex] hybrid orbitals of nitrogen and carbon line up. This allows electron sharing.
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Equation between Mg and H2O
Answer:
Mg + 2H2O → Mg(OH)2 + H2, is normally sluggish, but it becomes reasonably rapid when a milled composite of powdered magnesium metal and powdered iron (1−10 mol %) is used with sodium chloride solutions.