Answer:
The nucleus has an overall positive charge as it contains the protons. Every atom has no overall charge (neutral). This is because they contain equal numbers of positive protons and negative electrons. These opposite charges cancel each other out making the atom neutral.
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]
Which is heavier? A pound of cotton candy or a pound of marbles
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:
boiiiiiiiiiii
Explanation:
A biopsy is performed to determine if the tumor is
Answer:
cancerous
Explanation:
will ya'll help me, please
Answer:
Either A or D
But i think D
hope this helps =3
sorry if im wrong
Which is MOST likely to be considered “newsworthy”?
a study on which foods contain the most antioxidants, done five years ago
a study on which foods contain the most antioxidants, done two years ago
a study on which foods contain the most antioxidants, done last year
a study on which foods contain the most antioxidants, done last month
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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What are some of the Properties of Liquids.
Answer:
Liquids take on the shape of their container. The liquid state of matter is an intermediate phase between solid and gas. Like the particles of a solid, particles in a liquid are subject to intermolecular attraction; however, liquid particles have more space between them, so they are not fixed in position.
Explanation:
How many moles would 9.02 x 10^25 molecules of HCI equal?
Answer:
The answer is 149.83 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question
N = 9.02 × 10^25 molecules of HCI
We have
[tex]n = \frac{9.02 \times {10}^{25} }{6.02 \times {10}^{23} } \\ = 149.83388704...[/tex]
We have the final answer as
149.83 molesHope this helps you
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 atoms are in SH2O4 ?
Answer:
≈0.56 moles or ≈3.37⋅ 10 23 atoms
Explanation:
Can you guys please help me .. I don’t know we’re they go I only did one . Please help me this 6th grade work And I’m new to this pleaseee I will give you brainlest :( ? I’m only 11 .
Answer:
2.cohesion 3.adhesion 4. polar molecule 5. changing states 6. condensation 7.capilary action 8.adhesion 9. changing state 10. evaporation
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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Write down the molecular formula of sodium silicate?
Answer:
Na₂SiO₃
Explanation:
Which set of coefficients will balance this chemical equation?
__C2H4 + __02 - 2 CO2 + 2 H2O
A. 2,5
B. 1,3
C. 1, 2
D. 2,3
Answer:
Option B is correct = 1,3
Explanation:
Chemical equation:
C₂H₄ + O₂ → CO₂ + H₂O
Balanced chemical equation:
C₂H₄ + 3O₂ → 2CO₂ + 2H₂O
Step 1:
Left side Right side
C = 2 C = 1
H = 4 O = 3
O = 2 H = 2
Step 2:
C₂H₄ + O₂ → 2CO₂ + H₂O
Left side Right side
C = 2 C = 2
H = 4 O = 5
O = 2 H = 2
Step 3:
C₂H₄ + O₂ → 2CO₂ + 2H₂O
Left side Right side
C = 2 C = 2
H = 4 O = 6
O = 2 H = 4
Step 4:
C₂H₄ + 3O₂ → 2CO₂ + 2H₂O
Left side Right side
C = 2 C = 2
H = 4 O = 6
O = 6 H = 4
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.
6) What types of atomic orbitals are in the third principal energy
level?
C A sand p only
B. p and d only
CC. s, p, and d only
CD. s.p. d, and f
Answer:
Types of atomic orbitals present in the third principal energy are s, p and d only .
Explanation:
OPTION A-: s and p atomic orbitals - these two orbitals are present in second principal energy level. Therefore , the option is incorrect. OPTION B-: p and d only - This option is wrong as there is no such principal level energy where , s atomic orbital is absent .OPTION C-: s , p and d only -these orbitals are present in third principal energy level. The third major level of energy has one orbital, three orbitals of p, and five orbitals of d, each of which can contain up to 10 electrons. The third stage thus holds a maximum of 18 electrons. This option is correct .OPTION D-: s , p, d and f only -There is also a f sublevel at the fourth and higher stages, containing seven f orbitals, which can accommodate up to 14 electrons at most. Therefore, up to 32 electrons will hold the fourth level: 2 in the s orbital, 6 in the three p orbitals, 10 in the five d orbitals, and 14 in the seven f orbitals. This option is incorrect .Thus , the correct option is C (s , p and d only .)
Answer:
s, p, and d
Explanation:
Which is a property of barium (Ba)?
A. It does not conduct electricity.
B. It is brittle as a solid.
C. It rarely reacts with other elements.
D. It is very reactive.
Answer:
i think but i am not sure but according to me it mainly reacts yo non metals and i think its very reactive if my answer is wrong then comment below this question i will see it and i will get an opportunity to learn something new
The mitochondria in a cell is most like a_______in its function
Answer: microbe Rickettsia prowazekii
Explanation:
Is frying an egg a physical or a chemical change? Explain in detail
Answer:
Yes, a cooking egg is a chemical change! Water is evaporated from the egg and the egg changes composition. You might say that raw egg and water are the reactants and cooked egg and water vapor are the reactants.
Explanation:
Frying an egg is an example of a chemical change.
What is a chemical change?A chemical change refers to a kind of irreversible change. In this type of change, the element that undergoes a transformation cannot be returned to its original state.
This is the case with an egg which when fried cannot be returned to its original liquid state. So, unlike a physical change tha can be reversed, a chemical change is irreversible.
learn more about chemical changes here:
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Who performed the oil-drop experiment?
O A. Albert Einstein
B. Robert Millikan
O C. J. J. Thomson
D. Niels Bohr
Answer: Robert Millikan
Explanation: Robert Millikan was the first person to perform the oil drop experiment. It was done many centuries ago. Hope this helps you!
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]
3
In which of the following states of matter are the particles very far apart so they can fill their containers?
A.
gases only
ОВ.
solids, liquids, and gases
solids and liquids only
C.
D.
solids only
Reset
Submit
Answer:
A. gases only
Explanation:
It is only in gases that the particles are very far apart so they can fill their contains.
There are four major states of matter which solid, liquid, gases and plasma.
Particles of a gas have very weak attractive forces between them. They do not have fixed volume nor shapeThey easily fill up any containers they are put into. Gases are compressible and moves randomly in a straight line. Liquids and solids do not fill up containers. Liquids although have weak forces but they are better attracted than gases. Solids have fixed and definite volume.So, option A is the perfect answer.
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
A is a physical environment where a species lives and
becomes adapted,
a Nest
b Niche
C Habitat
d None of the above
1. Or what is the steering of a vehicle an example?
i Pulley
ii. Wedge
iii Wheel and axle
iv. First class lever
Answer: Wheel and axle
Explanation:
Wheel and axle is the best answer. Technically that's not the primary part that steers a vehicle though. A pulley is in the engine and I've never heard of wedge and first class lever. The question isn't too clear, but yea, I would pick ii if I was in your spot.
Divide the numbers
2
2
+
2
2
=
4
5
2
2
+
2
2
=
4
x
5
22+22=54x
1
+
2
2
=
4
5
1
+
2
2
=
4
x
5
1+22=54x
2
Divide the numbers
again
1
+
2
2
=
4
5
1
+
2
2
=
4
x
5
1+22=54x
1
+
1
=
4
5
1
+
1
=
4
x
5
1+1=54x
3
Add the numbers
1
+
1
=
4
5
1
+
1
=
4
x
5
1+1=54x
2
=
4
5
2
=
4
x
5
2=54x
4
Multiply all terms by the same value to eliminate fraction denominators
2
=
4
5
2
=
4
x
5
2=54x
5
⋅
2
=
5
⋅
4
5
5
⋅
2
=
5
⋅
4
x
5
5⋅2=5⋅54x
5
Simplify
Multiply the numbers
Cancel multiplied terms that are in the denominator
1
0
=
4
10
=
4
x
10=4x
6
Divide both sides of the equation by the same term
7
Simplify
Show less
Solution
5
2
=
Answer:
This is not a question
Explanation:
no
the density of granite is approximately 2.7 grams per cubic centimeter. what would be the approximate mass of a cube of granite 10.0 centimeters on a side
Given parameters:
Density = 2.7g/cm³
Length of the cube = 10cm
Unknown:
Mass of the cube = ?
Solution:
Density is the mass per unit volume of a substance.
Density = [tex]\frac{mass}{volume}[/tex]
Mass = density x volume
We need to find the volume of the cube;
Volume of the cube = L³
where L is the length of the cube;
Volume of the cube = 3³ = 27cm³
So, the mass of the granite = 2.7 x 27 = 72.9g
The granite has a mass of 72.9g
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:
Why do you think properties of materials used would be considered a constraint?
Answer:
For a material to be considered as building material, it should have required engineering properties suitable for construction works. These properties of building materials are responsible for its quality and capacity and helps to decide applications of these material. Such properties of building materials are categorized as follows. 1. Physical properties 2. Mechanical properties 3. Chemical properties 4. Electrical properties 5. Magnetic properties 6. Thermal properties
Explanation:
