Answer: When we represent a chemical reaction in terms of words, we write a word equation. For example, when hydrogen gas reacts with oxygen gas to form water, we can write a word equation for the reaction as follows: hydrogen + oxygen→ water To the left of the arrow, we have the 'before' situation.
Explanation:
which phase of matter is the rarest in the solar system
Answer:
liquid
Explanation:
Answer:
liquid
Explanation:
5. What kind of crust is involved in picture D?
Explakjbkhbjhbjnatip[ok[okoon:
[tex]\sqrt[n]{x} \int\limits^a_b {x} \, dx \geq x^{2} \sqrt{x} \neq \lim_{n \to \infty} a_n \left[\begin{array}{ccc}1&2&3\\4&5&6\\7&8&9\end{array}\right] \pi \sqrt[n]{x} \frac{x}{y} \alpha \beta x_{123} \\ \leq \left \{ {{y=2} \atop {x=2}} \right. \int\limits^a_b {x} \, dx \int\limits^a_b {x} \, dx \geq \geq \geq \geq x^{2} x^{2} x^{2} \left[\begin{array}{ccc}1&2&3\\4&5&6\\7&8&9\end{array}\right] \left[\begin{array}{ccc}1&2&3\\4&5&6\\7&8&9\end{array}\rig[/tex]
A 45.0 g coin of copper absorbed 45 calories of heat. What was the final
temperatuře of the copper if the initial temperature was 25°C? The specific heat
of copper is 0.092 cal/g°C. *
How much heat is absorbed when 500 g of
water, c = 4.184 J/g°C, goes from 25.0 °C to
35.0 °C?
Answer:
Assume that the coffee has the same density, 0.997 g/mL ... One liter of water has a mass of 1 kg and a specific heat of 4.184 J/(g °C).
Explanation:
Calculate the number of particles in a 0.75 gram sample of Calcium Nitrate; Ca(NO3)2
The number of particles : 2.75 x 10²¹
Further explanationA mole is a unit of many particles (atoms, molecules, ions) where 1 mole is the number of particles contained in a substance that is the same amount as many atoms in 12 gr C-12
1 mole = 6.02.10²³ particles
[tex]\tt n=\dfrac{N}{N_o}[/tex]
N = number of particles
No = Avogadro number (6.02.10²³)
n = number of moles
While the number of moles can also be obtained by dividing the mass (in grams) with the molar mass of element or molecule
0.75 gram sample of Calcium Nitrate; Ca(NO₃)₂
MW of Ca(NO₃)₂ : 164.09 g/mol
[tex]\tt mol~Ca(NO_3)_2=\dfrac{0.75}{164.09}=0.00457[/tex]
The number of particles
[tex]\tt N=n\times N_o\\\\N=0.00457\times 6.02\times 10^{23}=2.75\times 10^{21}[/tex]
what element has 16 protons in it's nucleus?
To which family on the Periodic Table does this Bohr Model belong?
Answer: Hydrogen
Explanation: The Bohr Atom is a very simplified model of the electron positions of each element of the Periodic Table. Each Row of the periodic table is represented by an orbit. Hydrogen and Helium are in the first energy level (row) of the periodic table and their Bohr Models would have one orbit.
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what are the starting substances (molecules) in a chemical reaction called?
Answer:pruducts Explanation:
Answer:
The Reactants
Explanation:
A P E X
204 g of Thallium & 35 g of chlorine?
4. DNA replication:
a. Occurs in the cytoplasm of the cell
b. Does not require proteins
C. Takes place in the nucleus of the cell
Is constantly happening in a cell
Answer:
A.
Explanation:
Answer:
b
Explanation:
An atom contains 16 protons, 18 neutrons, and 16 electrons what is its mass number?
Name the element of which this is an isotope.
16
protons
18
neutrons
16
electrons
Right from the start, you know that you're indeed dealing with a neutral atom, since the number of protons it has in its nucleus is equal to the number of electrons it has surrounding its nucleus.
Now, an atom's atomic number,
Z
, tells you how many protons it has in its nucleus. Nothing more, nothing less.
In your case, you are told that the atom contains
16
protons in its nucleus, which means that
Z
will be equal to
Z
=
16
A quick look in the periodic table will reveal that you're dealing with an atom of sulfur,
S
.
An atom's mass number,
A
, tells you how many protons and neutrons it contains in its nucleus. Since the number of protons is given by
Z
, you can say that
A
=
Z
+
no. of neutrons
In your case, the atom contains
18
neutrons in its nucleus. This means that
A
will be equal to
A
=
16
+
18
=
34
Finally, focus on the atom's electron configuration, which you know that must account for a total of
16
electrons.
S:
1
s
2
2
s
2
2
p
6
3
s
2
3
p
4
Its noble gas shorthand notation, which uses the electron configuration of neon,
Ne
, the noble gas that comes before sulfur in the periodic table, will look like this
S:
[
Ne
]
3
s
2
3
p
4
Please help.. This is not a test.. It’s a Naked egg experiment.. please help
Answer:
Is there a question you need help with?
Samples of the air we breathe that were taken from different parts of the world have all been found to contain about 78% nitrogen, 2196
oxygen, 0.9% argon, 0.03% carbon dioxide, and 0.07% other gases. Based on this analysis, which is the correct classification for air?
Answer:
homogeneous mixture
Explanation:
The correct classification for air is a homogeneous mixture.
What is a Mixture?Material is referred to as a mixture when two or more chemicals combine without undergoing a chemical reaction.
Heterogeneous and homogeneous mixtures are the two types of mixtures.
While homogeneous mixtures seem consistent throughout, heterogeneous mixtures have clearly discernible components.
A solution, which can be a solid, liquid, or gas, is the most typical kind of homogenous mixture.
Mixtures are composed of two or more different substances that have not been chemically mixed. The following is a list of mixture properties.
Each of the components in a mixture retains its unique features.
Component separation is simple to carry out.
The component's relative weights vary.
The classification for air is 78% nitrogen, 21% oxygen, 0.9% argon, 0.03% carbon dioxide, and 0.07% other gases.
This classification for air has the properties of a homogeneous mixture.
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A student painted one wall black and one wall white. Which color of paint will most likely appear brighter?
Answer:
white
Explanation:
A chemical reaction takes place to allow instant cold packs to absorb energy. This is an example of a(n) __________.
A. physical change
B. exothermic reaction
C. endothermic reaction
D. precipitate
Answer:
c. Endothermic
Explanation:
endothermic reactions absorb heat, exothermic reactions release heat.
A cart weighing 13kg is pushed by a vendor. If the cart accelerates at 3.5 m/s2
, how much
is the external force exerted by the vendor?
Answer:
If the cart accelerates at 3.5m/s2, what is the net external force exerted by the vendor? Given: Solution: m= 13kg F=ma a= 3.5m/s2 =13kg x 3.5m/s2 Find: =45.5kg*m/s2 or 45.5 N Fnet The net force exerted by the vendor was 45.5N. 4. 2.
Explanation:
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Answer:
what is the question????
Lead has a density of 11.4 g/cm^3. What is the density in kilograms per cubic meter?
The density in kg/m³ = 1.14 x 10⁴
Further explanationDensity is a quantity derived from the mass and volume
Density is the ratio of mass per unit volume
With the same mass, the volume of objects that have a high density will be smaller than objects with a smaller type of density
The unit of density can be expressed in g/cm³ or kg/m³
Density formula:
[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]
ρ = density , g/cm³ or kg/m³
m = mass , g or kg
v = volume , cm³ or m³
A density of Lead : ρ = 11.4 g/cm³
the density in kg/m³ :
[tex]\tt 11.4~\dfrac{g}{cm^3}\times \dfrac{kg}{10^3~g}\times \dfrac{cm^3}{10^{-6}~m^3}=\boxed{\bold{1.14\times 10^4~\dfrac{kg}{m^3}}}[/tex]
2. When it is winter, the United States receives the least direct solar energy, as compared with the rest of the year. Why does this happen? Pg. 36,43
Answer:
This is because earth is at a tilt, and the tilt is the cause of all seasons. In winter, we are the furthest from the sun due to the tilt.
Explanation:
How many grams of sodium chloride must be added to make 400 mL of a 0.600 M sodium chloride?
Answer:
14.0 g
Explanation:
nnandff
The mass in grams of sodium chloride must be added to make 400 mL of a 0.600 M sodium chloride is 14 grams.
How do we calculate mass from moles?Mass of any substance will be calculated by using their moles as:
n = W/M, where
W = required mass
M = molar mass
Also we know that, molarity of any solution is define as the number of moles of solute present in per liter of the solution.
M = n/V, where
M = molarity of NaCl = 0.600M
V = Volume of solution = 400mL = 0.4L
n = (0.6)(0.4) = 0.24moles
Now mass of NaCl will be calculated by using the first equation as:
W = (0.24mol)(58.44g/mol) = 14grams
Hence required mass of NaCl is 14 grams.
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1 pts
Define valence electrons.
o Valence electrons are the electrons on the outermost energy level of an
atom.
o Valence electrons are the electrons on the innermost energy level of an
atom.
Valence electrons are the electrons in the middle energy level of an
atom.
Valence electrons are the electrons on the inside of the nucleus of the
atom.
Answer:
Valence electrons are the electrons on the outermost energy level of an
atom.
The correct answer will be Valence electrons are the electrons on the outermost energy level of an atom.
A scientist heats a 300-g sample of iron from 30°C to 50°C. How much heat did the iron absorb.
The specific heat capacity of iron is 0.45 J/gºC.
Оа
Oь
Ос
Od
3,000)
2,700)
202,500)
2,500)
Answer:
d
Explanation:educated guess
give me example of analyze
Answer: analyze the question so that you can get a correct answer
Explanation:
How can some of the difficulties caused by the Down Syndrome be over come?
As the pressure of a system changes, boiling points can change in what direction?
Answer:
If the pressure of the system increases then the boiling point will increase.
If the pressure of the system decreases then the boiling point will decrease. If there is no change in pressure then the boiling point will remain constant.
Explanation:
Write down the molecular formula of sodium silicate?
Answer:
Na₂SiO₃
Explanation:
an ion that consists of 7 protons, 6 neutrons, and 10 electrons has a net charge of
Answer:
-3
Explanation:
The charge of the ion is determined by the number of protons and the number of electrons.
Protons are a positive + charge.
Electrons are a negative - charge.
We have 7 protons and 10 electrons.
+7 charge
-10 charge
-10 + 7 = -3 charge
The characteristics of two unknown intermolecular attractions, A and B, are compared in the table.
Intermolecular Attractions
A B
Occurs between non-polar diatomic molecules Occurs between polar molecules with either an N, O or F attached to an H atom
Which of the following conclusions about the two attractions is correct? (1 point)
A represents London dispersion forces, and B represents hydrogen bonding.
A represents ion-dipole interactions, and B represents hydrogen bonding.
A represents London dispersion forces, and B represents ion-dipole interactions.
A represents dipole-dipole interactions, and B represents ion-dipole interactions.
Answer:
A represents London dispersion forces, and B represents hydrogen bonding.
Explanation:
The Intermolecular force between two non polar molecules will be weaker London-dispersion forces. The bond between a hydrogen containing molecule with another molecule of an electronegative atom such as O, N etc. is hydrogen bond.
What is intermolecular forces?Intermolecular forces are forces between two molecules that bind them together. The force of attraction is generated by sharing of electrons or by donation of electrons.
Non-polar molecules are those with no charge separation. But when two non-polar molecules comes in contact a temporary dipole will create there and they attract each by the opposite charge ends. This type of force is called London dispersion force.
One molecule with a hydrogen atom is able to form a hydrogen bond with an electronegative atom of another molecule due to the electronegativity difference between hydrogen atom and atoms like N, O, F etc.
Therefore, the intermolecular force A is London-dispersion force and B is hydrogen bonding. Hence, option A is correct.
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A compound such as CaCl, would have an overall charge of?
Calcium Chloride would have a charge of +2
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A cylinder container can hold 2.45L of water. It’s radius is 4.00 cm. What is the volume of it in cubic centimeters?
Answer:
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Explanation:
