Answer:
Explanation:
Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged).
These are the last two questions on the sheet I need help with haha, help only the ones you can! (most helpful answer will get brainliest)
Answer:
the 7 question answer is c the 24 question answer is b
Explanation:
In the pie chart below, which of the following represents the amount of Earth's water located in the oceans?
A pie chart with part A representing 2%, part B representing .8%, part C representing .2% and part D representing 97%.
© 2011 FLVS
A only
A and B
C only
D only
Answer:
D. 97%
Explanation:
♪＼(*＾▽＾*)／＼(*＾▽＾*)／
Answer:
d
Explanation:
how do stars generate energy??
Answer:
The energy source for all stars is nuclear fusion. Stars are made mostly of hydrogen and helium, which are packed so densely in a star that in the star's center the pressure is great enough to initiate nuclear fusion reactions. In a nuclear fusion reaction, the nuclei of two atoms combine to create a new atom.
Which of the 3 sub particles of an atom, weighs the LEAST?
acronyms for the first 20 elements
Answer:
HHeLiBeBCNOFNeNaMgAlSiPSClArKCaAnswer:
Acronym Elements Symbols
He Hydrogen H
has Helium He
light Lithium Li
brain Beryllium Be
but Boron B
can Carbon C
not Nitrogen N
offer Oxygen O
full Fluorine Fl
nine Neon Ne
subjects Sodium Na
must Magnesium Mg
all Aluminium Al
silly Silicon Si
people Phosphorus P
stop Sulphur S
calling Chlorine Cl
a Argon Ar
pope Potassium K
christ Calcium Ca
Which of the following industrial processes involves a voltaic cell rather than electrolysis?
coating forks and knives with silver ?
extracting sodium from sodium hydroxide ?
reinforcing the hull of a ship so that it resists corrosion ?
converting energy stored in chemical bonds to electricity ?
Answer: D. Converting energy stored in chemical bonds into electricity.
Explanation:
100% on edg 2021 quiz.
Answer:
D. converting energy stored in chemical bonds to electricity
Explanation:
Edge 2020
1. Which statement describes the earliest model of
the atom?
Answer:
A). An atom is an indivisible hard-sphere.
Explanation:
The 'Atomic Theory' of Dalton is characterized as the earliest model(came in 1803) which described the atoms as the indivisible and resistant spheres. He used the example of watermelon to elaborate that the atoms of a specific element share similar characteristics and the atoms of distinct elements differ in their mass as well as their size. Thus, option A is the correct answer.
bohr's work demonstrate the importance of communication in science because it wouldn't have been possible without the work of other scientists.
true or false
Answer:
Why science communication is important? In the world we live in, not only does pursuing science matter but communicating about it effectively is important as well. Communicating about science is crucial, whether we communicate about it online or face to face, communication about the scientific facts is vital for the scientific community. This is especially important now when many question scientific methods, research, and results. We are not only talking about communication about science between academics, scientists and corporations, but we are also talking about the gap between the scientific world and non-scientific community.
true
The given statement is true.
• The atomic model of Bohr was based on the model given by Rutherford as he clarified the location of electrons.
• Based on Bohr's model, the electrons only at the fixed distances from the nucleus orbit around it known as the energy levels.
• The work of Bohr illustrates the significance of communication in science as it would not be possible without the contribution of other scientists.
• The atomic model of Bohr was built upon the atomic models of other scientists, mainly Rutherford.
Thus, the given statement is true.
To know more about:
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The balanced equation for combustion in an acetylene torch is shown below: 2 upper C subscript 2 upper H subscript 2 plus 5 upper O subscript 2 right arrow 4 upper C upper o subscript 2 plus 2 upper H subscript 2 upper O. The acetylene tank contains 35.0 mol C2H2, and the oxygen tank contains 84.0 mol O2. How many moles of O2 are needed to react completely with 35.0 mol C2H2? mol O2
Answer:
87.5 mol of O2 is required to completely react with 35.0mol of C2H2
Explanation:
The equation is given as;
2C2H2 + 5O2 --> 4CO2 + 2H2O
The acetylene tank contains 35.0 mol C2H2, and the oxygen tank contains 84.0 mol O2.
From the balanced equatioon, the realtionship between the reactants is given as;
2 mol of C2H2 reacts with 5 mol of O2
How many mol of O2 would then react with C2H2?
2 mol C2H2 = 5 mol O2
35 mol C2H2 = x mol O2
Upon solving for x;
x = 35 * 5 / 2
x = 87.5 mol of O2
Answer:
87.5
Explanation:
sulpher is a non metal
Answer:
Sulphur is a non-metal because it's valency is 6 and it have many character of non-metal.
Look at the simplified Periodic Table in the attachment. Each letter
represents an element but the letter is not the real chemical symbol.
Use your knowledge to sort the letters to say whether they are metal
or non-metal elements.
W
Y
V
Z
x
Answer:
According to this picture w and y are metals and v z and x are non metals
Explanation:
1 How many moles of solute are in:
a 500 cm of solution, of concentration 2 moldm"?
b 2 litres of solution, of concentration 0.5 mol/dm?
Pls answer I will mark the person brainliest
Moles of solute for both a and b are the same = 1 mol
Further explanationGiven
a 500 cm³ of solution, of concentration 2 mol/dm³
b 2 litres of solution, of concentration 0.5 mol/dm³
Required
moles of solute
Solution
Molarity shows the number of moles of solute in every 1 liter of solution or mmol in each ml of solution
Can be formulated :
[tex]\large \boxed {\bold {M ~ = ~ \dfrac {n} {V}}}[/tex]
a.
V = 500 cm³ = 0.5 L
M = 2 mol/L
n=moles = M x V
n = 2 mol/L x 0.5 L
n = 1 mol
b.
V = 2 L
M = 0.5 mol/L
n=moles = M x V
n = 0.5 mol/L x 2 L
n = 1 mol
2H2 + O2- 2H20
Which conversion factors will you need to calculate the
mass of H2O that is made when 8 grams of H2 react?
Conversion factor : molar mass/molecular weight
Mass of H₂O produced = 72 g
Further explanationGiven
Reaction
2H2 + O2- 2H20
8 grams of H2
Required
Conversion factors
Solution
We can use the molar mass of the components and the mole ratio as conversion factors for the above equation
mol H₂ (MW = 2 g/mol) :
[tex]\tt mol=\dfrac{8}{2}=4~mol[/tex]
From the equation, mol ratio of H₂ : H₂O = 2 : 2, so mol H₂O = 4 mol
mass H₂O(MW = 18 g/mol) :
mass = mol x MW
mass = 4 x 18
mass = 72 g
what is electrochemistry?
A. the study of photons in chemistry
B. the study of electricity in chemistry
C. the study of charge particles in chemistry
D. the study of valence-electrons in chemistry
Answer:
B. the study of electricity in chemistry
Explanation:
Electrochemistry is the study of chemical processes that cause electrons to move. This movement of electrons is called electricity, which can be generated by movements of electrons from one element to another in a reaction known as an oxidation-reduction ("redox") reaction.
Answer:
B => Study of electricity in chemistry
Explanation:
Electrochemistry is the study of electricity associated with chemical oxidation-reduction reaction. It is divided into two distinct disciplines; electrolysis and Galvanic Process.
Electrolysis is a nonspontaneous process requiring an outside power source (typically a battery) to drive the chemical reactions. Applications include metal refining and generation of various gases (for collection) by chemical process.
Galvanic Process is a spontaneous chemical process generating electrical energy by taking advantage of the different properties of metals. Applications include batteries for many devices such as flash lights (Leclanche dry cell), alkaline button batteries for hearing aids, automobile batteries (lead storage batteries), the H₂/O₂ Fuel Cell battery, etc.
In general,
Electrolysis => Uses electrical energy (batteries) to drive chemical reactions
or,
Galvanic Process => Using chemical reactions to generate electrical energy
Define Isotopes with an example.
Answer:
One or more number of species which have same number of atomic number but different mass number are called isotopes.
For example, [tex]^{1}_{1}H, ^{2}_{1}H, ^{3}_{1}H[/tex] are the isotopes of hydrogen.
So here, the atomic number of each of these isotopes is 1 and have different mass number, that is, 1, 2, 3.
What is misleading about the terms “melting point” and “boiling point”?
Answer:
The melting point is when a solid is turning into a liquid, boiling point is when a liquid turns into a gas. The thing that is misleading is that they are both changing state because of heat.
Explanation:
When a solid melts into a liquid, the melting point has been reached, and when a liquid changes into a gas, the boiling point is reached.
Melting point and Boiling point:The melting point is defined as the temperature at which solid and liquid phases are in equilibrium, whereas the boiling point is defined as the temperature at which a liquid's vapor pressure equals the external pressure.
What's confusing is that they're both changing states as a result of heat.
Find out more information about 'Melting point'.
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How many moles are in 3.57 x 10 32
particles Ca?
Answer:
[tex]\boxed {\boxed {\sf 592,826,303.6 \ moles \ of \ Ca }}[/tex]
Explanation:
To convert from moles to particles, we must Avogadro's Number.
[tex]6.022*10^{23}[/tex]
This number tells us the number of particles (atoms, ions, molecules, etc.) in 1 mole of a substance. In this case, it is the particles of calcium in 1 mole of calcium.
[tex]6.022*10^{23} \ particles \ Ca / mole \ Ca[/tex]
We can use Avogadro's Number as a ratio or fraction.
[tex]\frac{6.022 *10^{23} \ particles \ Ca}{1 \ mol \ Ca}[/tex]
Multiply this by the given number of particles (3.57*10³²).
[tex]3.57*10^{32} \ particles \ Ca*\frac{6.022 *10^{23} \ particles \ Ca}{1 \ mol \ Ca}[/tex]
Flip the fraction so the particles of calcium will cancel out.
[tex]3.57*10^{32} \ particles \ Ca*\frac{1 \ mol \ Ca}{6.022 *10^{23} \ particles \ Ca}[/tex]
[tex]3.57*10^{32} *\frac{1 \ mol \ Ca}{6.022 *10^{23} }[/tex]
[tex]\frac{3.57*10^{32} \ mol \ Ca}{6.022 *10^{23} }[/tex]
[tex]592826303.6 \ mol \ Ca[/tex]
There are 592,826,303.6 moles of calcium in 3.57*10³² particles of calcium.
Hydrogen and oxygen combine in the ratio of 1:8 by mass to form water. How many grams of hydrogen are needed to react completely with 6.4 g of oxygen gas? Show complete working. Which law of chemical combination will govern your answer? Write the law.
Explanation: Number of moles of water = mass of water/ molar mass.
Molar mass of H2O = (1*2) + 16 = 18.0
Now we only need to calculate the number of moles of water.
The chemical reaction is as follows
CH4 + 2O2 ---> CO2 + 2H2O
From the eqn, the moles of H2O = 2*moles of CH4
Molar mass of CH4 = 12 + 4 = 16. Number of moles of methane = mass/
molar mass. No of moles = 6.4/16 = 0.4. So the number of mole of water = 2* 0.4 = 0.8. We already calculate its molar mass earlier. So mass of water = molar mass * number of moles = 18 * 0.8 = 14.4
Help me please in science !! ( 10 points )
Answer: Nuclear
Explanation:
Nuclear energy generates power through fission, which involves splitting uranium atoms to produce energy. The heat released by fission is used to create steam that rotates turbine to generate electricity.
The energy produced by nuclear plants is carbon free but the products formed are radioactive and hence their transportation, storage, and disposal is a big problem. It can not be dumped like normal waste.
Monsters are real, and ghosts are real too. They live inside us, and sometimes, they win - Stephen King.
━━━━━━━━━━━━━
Answer:
so what is the question?
where is the question?
thank you for free points. GBU.
Iron (III) chloride reacts with potassium hydroxide to produce iron (III) hydroxide and
potassium chloride.
Answer:
The balanced chemical equation is :
FeCl3 + 3KOH → Fe(OH)3 + 3KCl
What is the mid-ocean ridge? Two complete sentences.
Answer:
A mid-ocean ridge is an underwater mountain range, formed by plate tectonics.Mid-ocean ridges represent one of the most important geologic processes shaping the Earth
Based on its position on the periodic table, which of the following elements is a nonmetal?
A. Potassium (K)
B. Vanadium (V)
C. Nickel (Ni)
D. Bromine (Br)
Answer:
D. Bromine (Br)
Explanation:
Based on its position on the periodic table Bromine is the only non-metal from the given choices of elements.
Potassium is an alkali-metal and it belongs to group 1 on the periodic table. Vanadium and Nickel are transition metals which belongs to the d-block on the periodic table. Bromine, Br is a halogen which belongs to group 7 on the periodic table. The group is a group of non-metalsdescribe how vitamin A may be used in the body
Answer:
Vitamin A is important for normal vision, the immune system, and reproduction. Vitamin A also helps the heart, lungs, kidneys, and other organs work properly. There are two different types of vitamin A. The first type, preformed vitamin A, is found in meat, poultry, fish, and dairy products.
Answer:
Vitamin A helps form and maintain healthy teeth, skeletal and soft tissue, mucus membranes, and skin. It is also known as retinol because it produces the pigments in the retina of the eye. Vitamin A promotes good eyesight, especially in low light. It also has a role in healthy pregnancy and breastfeeding.
:-))
What are the 3 reactants necessary for photosynthesis
Answer:
Carbon dioxide
Water
Glucose
Answer:
To perform photosynthesis, we need three things: Carbon Dioxide WaterSunlightAn element has a half-life of 5.0 days. How many days would
pass before only 1/8th of the original amount of a sample of this
element remained?
*
Which of the following would NOT be found in an animal cell?
Chloroplasts
Endoplasmic Reticulum
Cell Membrane
Nucleus
Answer:
chloroplasts
Explanation:
chloroplasts are what make plants green, they are not included in animal cells
Which of the following words/phrases can be used to describe table salt (NaCl)?
Select one or more:
a.Compound
b.Element
c.Mixture
d.Pure substance
What is a scientific theory?
A theory is a summary of a scientific fact based on observation.
A theory is an explanation of why a scientific process occurs.
A theory is a proven scientific law.
A theory is a guess as to what will happen.
Answer:
Explanation:
I'm guessing B)
I'm 86.7% sure that might be right.
Answer:
A theory is a broad, natural explanation for a wide range of phenomena.
question in the picture thank you sm!!!!
Answer:
Explanation:
Reactants Product
H = 2 H=2
Cl=2 Cl=2
Zn=1 Zn=1
Total number of atoms 5 Total number of atoms 5