Answer:
measuring the isotopic composition of atmospheric co2 shows that the burning of fossil fuels has led to the co2 levels over the last 200 years.
Explanation:
pa brainliest po ty
Write the configuration for electron: 4, 2, -1, +12
Answer:
-1
Explanation:
electrons are negative
A system which allows both mass and energy to flow into the surroundings is called
Answer:
An open system can exchange both energy and matter with its surroundings. The stovetop example would be an open system, because heat and water vapor can be lost to the air.
Explanation:
Does anyone know what the answer to the question is?
Answer:
rate = (6.48 M-1 • s-1)[Cl2O5]2
Explanation:
Will the things dissolve by themselves over time?
When a substance dissolves, it looks like it disappears. But in fact it has just mixed with the water to make a transparent (see-through) liquid called a solution. A solution has two parts. The solute is the solid that gets dissolved.
Answer:
it really depends what they are
Explanation:
the total charge of an atom comes from
a) protons only
b) neutrons only
c) protons and neutrons
d) protons and electrons
The total charge on an atom comes from protons and electrons.
The proton is positively charged while the electron is negatively charged. A neutral atom would have an equal number of protons and electrons.
An atom with more protons than electrons will be positively charged while those with more electrons than protons will be negatively charged.
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what is negative in food sterilization?
Answer:
Thermal food sterilization and pasteurization are the most widespread preservation technologies to extend food shelf life by inactivating microorganisms and enzymes that can deteriorate foodstuffs.
Explanation:
The process requires constant attention.
The equipment that it requires are costly.
Keeping moisture in food is difficult because of low moisture contents in the machine.
(Please someone help me!) (No links!)
Match the following motions to these graphs:
Answer:
Speeding up: graph 6
Slowing down: graph 1
Fast Constant Speed, forward: graph 2
Slow constant speed, forward: graph 5
Fast constant speed, Backward: graph 4
Slow constant speed, Backward: graph 7
Sitting still: graph 3
(Im not 100% but this makes the most sense i think)
How many significant figures are in 0.005439
Answer:
Number of Significant Figures: 4
The Significant Figures are 5 4 3 9
Explanation:
How does covalent bonding take place?
A. A nonmetallic element like Fluorine is attracted to a metallic element like
Sodium.
B. A metallic element like Sodium transfers an electron to a non-metallic element
like Fluorine.
C. Two or more non-metallic elements share electrons to attain stability.
D. Two or more non-metallic elements of the same kind form strong forces of
attraction.
que es y que define a los elementos quimicos
Un elemento químico, o un elemento, se define como un material que no puede descomponerse ni transformarse en otra sustancia por medios químicos. Cada elemento se identifica según la cantidad de protones que tiene en su núcleo atómico. Se puede crear un nuevo elemento agregando más protones a un átomo.
_________
Espero eso ayude ⚜
ITZY :)
Explain how the heat and phase changes affects the environment? Give examples.
(5-7 sentences)
Can someone please help me with these questions? I put them on here and some keep getting taken down. I need help asap!
Answer the following questions in complete sentences.
Why do you think that you had to use a thin layer of onion skin, rather than a thick layer for the microscope?
When iodine reacts with starch, it produces a blue-black color. Starch is a white substance which plants use to store food. What structure did you see better because of the iodine? Why did you see this structure better?
From low power to high power, what structures became clearer in the unstained onion tissue?
From low power to high power, what structures became clearer in the stained onion tissue?
What is the shape of an onion cell?
Ques.1: Why do you think that you had to use a thin layer of onion skin, rather than a thick layer for the microscope?
Ans:- It is because, I the onion peel is thick layered, then it will be hard or impossible to see through the microscope.
Ques.2: When iodine reacts with starch, it produces a blue-black color. Starch is a white substance which plants use to store food. What structure did you see better because of the iodine? Why did you see this structure better?
Ans: Amylose in starch is responsible for the formation of a deep blue color in the presence of iodine. The iodine molecule slips inside of the amylose coil.
This makes a linear triiodide ion complex with is soluble that slips into the coil of the starch causing an intense blue-black color.
Due to this, we can see the structure better.
Ques.3: From low power to high power, what structures became clearer in the stained onion tissue?
Ans: From lower to higher power, we can see:-
-- Large, rectangular interlocking cells,
-- Clearly visible distinct cell walls surrounding the cells,
-- Dark stained nucleus,
-- Large vacuoles at the center,
-- Small granules may be observed inside the cells (within the cytoplasm)
Ques.4: What is the shape of an onion cell?
Ans: The shape of an onion cell is rectangular or square in shape.
Which event is an example of an exothermic reaction? (1 point)
o evaporation
o melting ice
O combustion
o decomposition
Answer:
An exothermic reaction is defined as a reaction that releases heat and has a net negative standard enthalpy change. Examples include any combustion process, rusting of iron, and freezing of water.
Explanation:
An exothermic reaction is defined as a reaction that releases heat and has a net negative standard enthalpy change. Examples include any combustion process, rusting of iron, and freezing of water.
The combustion is an example of an exothermic reaction.
An exothermic reaction is a reaction that releases energy, this energy is usually in the form of heat. An endothermic reaction is a reaction that absorbs energy to take place.
Analyzing the given reactions we have that:
Evaporation: need to absorb energy to increase the kinetic energy of the moleculesMelting ice: need to absorb energy to increase the kinetic energy of the moleculesCombustion: releases energy after forming bonds between moleculesDecomposition: need to absorb energy to break moleculeSo, the combustion is an example of an exothermic reaction.
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what is the solute when stirring salt in water until the salt disappears?
Answer:
The solute is the substance being dissolved.
The solvent is the substance dissolving the solute.
Therefore, the salt is the solute and the water is the solvent.
Explanation:
The salt is the solute.
the distance between two successive peaks is called
How do erosions affect land forms?
Erosion is the only cause of land form changes.
Land forms can be created by erosion.
Erosion can prevent land forms from being built.
Land forms can only be created through erosions.
Answer:
the anwser is landforms can be created by erosion
Explanation:
Which image represents a homogeneous mixture?
Which image represents a heterogeneous mixture?
Imagine A represents a heterogeneous mixture as it is a mixture composition that does not remain the same throughout the mixture whereas Imagine B represents a homogeneous mixture as it does not have any change or irregularity.
What are Homogenous and Heterogenous mixtures?A homogeneous mixture is defined as having a fairly uniform form and composition, so many homogeneous mixtures are referred to as solutions whereas heterogeneous mixtures are defined as separate substances or phases. The three states or states of matter are gas, liquid and solid.
Some examples of mixtures that include mixtures of sand and water, mixtures of sugar and salt, and mixtures of lime juice and water.
In homogenous solution, particles are distributed uniformly and have uniform composition while in heterogenous solution, particles are distributed non-uniformly and have non-uniform composition
Thus, Imagine A represents a heterogeneous mixture as it is a mixture composition that does not remain the same throughout the mixture whereas Imagine B represents a homogeneous mixture as it does not have any change or irregularity.
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Match the vocabulary word to its definition.
neutron
the central part of the atom containing
protons and neutrons
proton
a negatively charged particle that orbits
the nucleus of an atom
nucleus
a neutral particle located in the nucleus
of an atom
electron cloud
a positively charged particle located in
the nucleus of an atom
electron
the area of the atom surrounding the
nucleus where electrons can be found
Intro
Done
Answer:
neutron --> a neutral particle located in the nucleus of an atomproton --> a positively charged particle located in the nucleus of an atomnucleus --> the central part of the atom containing protons and neutronselectron cloud --> the area of the atom surrounding the nucleus where electrons can be foundelectron --> a negatively charged particle that orbits the nucleus of an atomhow many moles of hydrogen are there in one mole of h2o?
What is called exothermic
An exothermic process is one that gives off heat.
Explanation:
This heat is transferred to the surroundings. An endothermic process is one in which heat has to be supplied to the system from the surroundings.
Which is an example of a physical change?
A) Mixing blue and yellow paint to create green paint
B) Adding water and yeast to bread dough in order to make it raise.
C) Mixing two liquids together in a test tube and the tube becoming warm.
D) Adding a piece of chalk containing calcium carbonate to a glass of mild acid causing the information of a foam of bubbles.
According to coulomb's law, in which ionic compound are the attractive forces the strongest?.
Answer:
A cation with a 2+ charge will make a stronger ionic bond than a cation with a 1+ charge. A larger ion makes a weaker ionic bond because of the greater distance between its electrons and the nucleus of the oppositely charged ion.
For the reaction, calculate how many moles of the product form when 0.046 mol of O2 completely reacts.
Assume that there is more than enough of the other reactant.
2Ca(s)+O2(g)→2CaO(s)
Express your answer using two significant figures.
Answer: 0.023 moles of CaO.
Explanation:
The balanced equation tells us that we'll get 2 moles of CaO for every one mole of O2. Since we have 0.046 moles of O2, we'll get 0.023 moles of CaO. (2 sig figs)
the Periodic Table •
Class
Key Terms
Key Terms Ch. 4
Use the clues to help you unscramble the Key Terms from the chapter. Then put the
numbered letters in order to find the answer to the riddle.
Clues
Key Terms
1. A fast-moving electron
given off by a nucleus
during radioactive decay. tbaerlpiaect
2. A term used to describe a
material that can be pounded
into shape
llbeealam
3. The process of oxygen
reacting with a metal to
form rust
4. A particle in the atomic
nucleus that carries no
charge
5. A horizontal row across the
2
rsoooiner
3
ouetnrn
periodic table
roiedp
6. Substance that can only
6
conduct electric current
under certain circumstances. otmidsceuncro
7
7. A term used to describe a
material that can be drawn
into a long wire
lecuitd
8 9
8. Radioactive isotope that can be
followed through a chemical
reaction or an industrial
process
aerrtc
9. The elements in Group 18
of the periodic table
nreti ssgea
11 12
10. The very small center core
of an atom
13
10
cuunsle
Riddle: What chart shows the repeating properties of elements?
Answer:
1 2 3 4 5 6 7 8 9 10 11 12 13
Answer:
your question too long did not read all
Explanation:
Potential energy depends on
Question 2 options:
Length and color
Position or shape
Density and volume
Speed and velocity
Answer:
Explanation:
Speed and velocity I think
can you write the answer for lot of points
[tex]\\ \sf\longmapsto Work=Force\times Displacement [/tex]
[tex]\\ \sf\longmapsto Force=\dfrac{Work}{Displacement}[/tex]
[tex]\\ \sf\longmapsto Force=\dfrac{2400}{6}[/tex]
[tex]\\ \sf\longmapsto Force=400N[/tex]
an atom of ordinary hydrogen consists of an electron and a
Answer: hydrogen atom is an atom of the chemical element hydrogen. The electrically neutral atom contains a single positively charged proton and a single negatively charged electron bound to the nucleus by the Coulomb force.
Explanation:
An atom of ordinary hydrogen consists of one electron and one proton and zero neutrons.
What is a hydrogen atom?Hydrogen is a chemical element placed at the top of group 1 in the periodic table and is represented by the chemical symbol H and atomic number 1.
A hydrogen atom is the lightest atom of the element in the whole periodic table. Hydrogen exists as a gas of diatomic molecules having the formula H₂ at standard conditions. Hydrogen gas is tasteless, colorless, odorless, non-toxic, and highly combustible.
Hydrogen is constituting roughly 75% of all normal matter and is the most abundant chemical substance in the universe. Most of the hydrogen element on Earth exists in forms like water and organic compounds. Each atom of hydrogen (¹H) has one proton, one electron, and no neutrons.
Hydrogen element is nonmetallic and easily forms a single covalent bond with most nonmetallic elements, forming compounds like water.
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help asap for brainlist
Which statement BEST describes how many Aluminum atoms are needed when making Aluminum chloride?
Question 11 options:
1 Aluminum atom is needed because Aluminum donates one valence electron to Chlorine.
3 Aluminum atom is needed because Aluminum donates three valence electron to Chlorine.
3 Aluminum atom is needed because Aluminum accepts three valence electron from Chlorine.
2 Aluminum atom is needed because Aluminum accepts three valence electron from Chlorine.
Answer:
34 Aluminum Atoms needed to make Aluminum Chloride
Explanation:
Because through this bottom 34 atoms are subheading to make Aluminum Chloride through magnesiumPLZ HELP!!!
What are 3 genetic disorders caused by either missing or extra chromosomes? In your own words, provide a brief short explanation of what causes the disorder and some potential symptoms.
BEST ANSWER WILL BE MARKED AS BRAINLIEST!!!
Answer:
Humans have 23 pairs of chromosomes.
A trisomy is a chromosomal condition characterised by an additional chromosome.
A person with a trisomy has 47 chromosomes instead of 46.
Down syndrome, Edward syndrome and Patau syndrome are the most common forms of trisomy.
Explanation:
What three factors describe the
movement of surface water in streams and
rivers?
Three factors that describe the movement of surface water in streams and rivers are the river's gradient, flow, and stream load.
I hope this helps!