Answer:
14
Explanation:
70g/(35mL-30mL)=14g/mL
If a rock with a mass of 70 grams is dropped into a graduated cylinder with 30 milliliter of water in it. The water level rose to 35 milliliters, then the density of the rock in gram / milliliter would be 14 gram / milliliter.
What is density?It can be defined as the mass of any object or body per unit volume of the particular object or body. Generally, it is expressed as in gram per cm³ or kilogram per meter³.
The mass of ṭhe rock = 70 grams
The volume of the rock = 35 milliliters - 30 milliliters
= 5 milliliters
The density of the rock = mass of the rock / volume of the rock
=70 grams / 5 milliliters
= 14 gram / milliliter
Thus, the density of the rock would be 14 gram / milliliter.
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Which of the following increases with increasing atomic
number down a group?
Answer:
The number of energy levels increases as you move down a group as the number of electrons increases. Each subsequent energy level is further from the nucleus than the last. ... The outermost electrons are repelled by the inner shell electrons (Screening effect) and hence, the atomic size increases.
Explanation:Increase in atomic size
Which of these solutions are basic at 25 °C ? A:[OH−]=2.53×10−7 M B:[H3O+]=9.99×10−9 M C:[H3O+]=6.31×10−4 M
Answer: frfg6
Explanation: 655tyyt
please help 10 points asap
Answer:
opposite
Explanation:
Answer:
opposite
Explanation:
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Metamorphic rocks with a non-foliated texture show metamorphic change that involves what
Explanation:
well I'm not 100% sure but I studied a little bit with rocks and crystals I've noticed that the hotter the temperature are it does not matter if it is Obsidian the hotter it is the more shinier it will become so the texture of it has to be a right temperature to be able to create a different texture such as a diamond and a diamond has to be compressed so hard that it will turn into diamond this is just an explanation please do not take this as a real answer I hope this help you though
What are some structural adaptations of adult frogs that help them survive in their environment?
Explain how each adaptation helps the frogs.
Answer:
Well I think that the frogs ability to breath underwater is a adaptation to help them from prededors. Also, they have camophlage to help too.
The amount of force needed to keep a 10 kg box moving at a constant
speed of 0.4 m/s on frictionless ice is *
ON,
0.04N
40 N
1.4 N
Answer:
ON
Explanation:
Frictional force is a force that opposes the motion of body. It is because of friction that motion can be controlled and even walking is made possible.
Now, on a frictionless surface, there is no opposition to motion. Therefore, to keep the body moving there is no force required.
If surface lacks friction, motion will continue perpetually without any hinderance.what are the value and units for the speed of light
Answer:
299,792,458
Explanation:
which body system carries oxygen, glucose and amino acids to all the cells of the body?
Answer:
Blood
Explanation:
This flows through the body so it gives it all over.
The atom is one of the basic units of matter. Which part of the atom mostly determines the size of the atom?
a.Electrons
b.Nucleus
c.Neutrons
d.Protons
Answer:
Atomic size is the distance from the nucleus to the valence shell where the valence electrons are located. The separation that occurs because electrons have the same charge. The number of protons in the nucleus. The core electrons in an atom interfere with the attraction of the nucleus for the outermost electrons.
Explanation:
That would be B I believe, but please correct me if I'm wrong.
A rock rolls down a hill. Which form of energy is this an example of?
Chemical
Electrical
Mechanical
Thermal
Answer:
Mechanical
Explanation:
chemical
Explanation:
I took test 2020
why saturated fatty acid can’t create kink ?
Which are correct ???
Answer:
last one
Explanation:
endothermic reactions release energy
polyatomic ions with identical molecular formula called?
Which is located inside the lung?
Answer:what are the options????
Explanation:
Answer:
D. The Alveoli.
Explanation:
How and why was the periodic table set up?
The net force on a vehicle that is accelerating at a rate of 1.5m/s^2 is 1,800 newtons. What is the mass of the vehicle to the nearest kilogram?
Answer:
Explanation:
Net force F = 1800 N
acceleration a = 1.5 m /s²
mass = m
mass = force / acceleration
= 1800 / 1.5
m = 1200 kg
The mass of the vehicle to the nearest kilogram is 1200 Kg
The force acting on an object is defined by the following equation
Force (F) = mass (m) × Acceleration (a)
F = ma
With the above formula, we can obtain the mass of the vehicle as follow:
Force (F) = 1800 N
Acceleration (a) = 1.5 m/s²
Mass (m) =?[tex]m = \frac{F}{a} \\ \\ m = \frac{1800}{1.5} \\ \\ m = 1200 \: Kg[/tex]
Therefore, the mass of the vehicle is 1200 Kg
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Which of the following elements has 3 electrons in the 2p sublevel?
O A. O
O B. C
O C. B
O DN
Answer:
the answer is D. N
AP3X
According to electronic configuration, there are 3 electrons in the 2p sublevel ,hence the correct option is D.
Electronic configuration is defined as the distribution of electrons that are present in an atom or molecule in an atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is important for understanding the structure of periodic table. It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions so as to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in their ground state and hence are said to be stable.
Thus, the correct option is D.
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What is the best synonym for the word "stoichiometry?"
Answer:
chemistry, ratio, cluster chemistry, solid-state chemistry, flow chemistry.
Explanation:
which type of rection has the general formuial ab+cd
Write the symbol for every chemical element that has atomic number less than 73 and atomic mass greater than 173.2 u
17. Which is a fat-soluble vitamin?
O vitamin B
O vitamin C
O vitamin A
Which can not be chemically broken down into simpler substances
If the stack of bricks on the right has a mass of 240 kg, approximately what is the mass of the stack of bricks on the left?
A.
2400 kg
B.
720 kg
C.
320 kg
D.
480 kg
Answer:
720
Explanation: study island
Answer:
720
Explanation:
C is the element symbol for which element?
a. Carbon
b. Cadmium
c. Celenium
d. Chlorine
Answer:
A) Carbon
Explanation:
the others are wrong its A
Answer:
A) carbon
Explanation:
carbon or simply c has an atomic number of 6 and it has an atomic mass of 12.01 amu. it belongs to group 4a
Whenever the same two elements form more than one
compound, the different masses of one element that combine
with the same mass of the other element are in the ratio of
small whole numbers.
TRUE
FALSE
Answer:
The answer is true
Explanation: Because The law of multiple proportions states that when two elements react to form more than one compound, a fixed mass of one element will react with masses of the other element in a ratio of small, whole numbers.
What mass in grams of MgSO4 is required to make 59.3 mL of 2.68 M
solution?
Answer:
Approximately [tex]19.1\; \rm g[/tex].
Explanation:
Number of moles of formula units of magnesium sulfate required to make the solutionThe unit of concentration in this question is "[tex]\rm M[/tex]". That's equivalent to "[tex]\rm mol \cdot L^{-1}[/tex]" (moles per liter.) In other words:
[tex]c(\mathrm{MgSO_4}) = 2.68\; \rm M = 2.68\; \rm mol \cdot L^{-1}[/tex].
However, the unit of the volume of this solution is in milliliters. Convert that unit to liters:
[tex]\displaystyle V = 59.3\; \rm mL = 59.3 \; \rm mL \times \frac{1\; \rm L}{1000\; \rm mL} = 0.0593\; \rm L[/tex].
Calculate the number of moles of [tex]\rm MgSO_4[/tex] formula units required to make this solution:
[tex]\begin{aligned}n(\rm MgSO_4) &= c \cdot V \\ &= 2.68 \; \rm mol \cdot L^{-1} \times 0.0593\; \rm L \approx 0.159\; \rm mol \end{aligned}[/tex].
Mass of magnesium sulfate in the solutionLook up the relative atomic mass data of [tex]\rm Mg[/tex], [tex]\rm S[/tex], and [tex]\rm O[/tex] on a modern periodic table:
[tex]\rm Mg[/tex]: [tex]24.305[/tex].[tex]\rm S[/tex]: [tex]\rm 32.06[/tex].[tex]\rm O[/tex]: [tex]15.999[/tex].Calculate the formula mass of [tex]\rm MgSO_4[/tex] using these values:
[tex]M(\mathrm{MgSO_4}) = 24.305 + 32.06 + 4 \times 15.999 \approx 120.361\; \rm g \cdot mol^{-1}[/tex].
Using this formula mass, calculate the mass of that (approximately) [tex]0.159\; \rm mol[/tex] of [tex]\rm MgSO_4[/tex] formula units:
[tex]\begin{aligned}m(\mathrm{MgSO_4}) &= n \cdot M \\&\approx 0.159 \; \rm mol \times 120.361 \; \rm g \cdot mol^{-1} \approx 19.1\; \rm g\end{aligned}[/tex].
Therefore, the mass of [tex]\rm MgSO_4[/tex] required to make this solution would be approximately [tex]19.1\; \rm g[/tex].
A chemical formula includes the symbols of the elements in the
compound and the subscripts that indicate*
how many atoms or ions of each type are combined in the simplest unit
the formula mass
the number of moles in each element
the charges of the elements or ions
Answer:
it indicates, how many atoms or ions of each type are combined in the simplest unit.
calculate the number of atoms of each type in 5.3 gram of sodium carbonate
Number of atoms = number of moles x 6.02 x 10²³
Further explanationThe mole is the number of particles contained in a substance
1 mol = 6.02 x 10²³ particles
mol of Sodium carbonate-Na₂CO₃
MW = 106 g/mol
Namass Na
[tex]\tt \dfrac{2\times 23}{106}\times 5.3=2.3[/tex]
mol Na
[tex]\tt \dfrac{2.3}{23}=0.1[/tex]
number of atoms = 0.1 x 6.02 x 10²³ = 6.02 x 10²²
Cmass C
[tex]\tt \dfrac{12}{106}\times 5.3=0.6[/tex]
mol C
[tex]\tt \dfrac{0.6}{12}=0.05[/tex]
number of atoms = 0.05 x 6.02 x 10²³ = 3.01 x 10²²
Omass O
[tex]\tt \dfrac{3.16}{106}\times 5.3=2.4[/tex]
mol O
[tex]\tt \dfrac{2.4}{16}=0.15[/tex]
number of atoms = 0.15 x 6.02 x 10²³ = 9.03 x 10²²
Will give brainliest, Look at the graph above. Compare it to the periodic table. What do you notice about the location on the periodic table of the elements that represent the high points
Answer:
We can see that the atomic radius decreases across every row.
Explanation:
I will comment more below.
The elements that represent the highest points on the graph are all elements of group 1 and occur at the head of the period to which they belong.
The periodic table is an arrangement of elements in groups and periods. The elements in the same group have the same number of valence electrons while the elements in the same period have the same number of shells.
Looking at the graph, we can see that the high points in the graph all correspond to the group 1 elements; sodium, potassium, rubidium and cesium.The have the highest atomic radii in the period. Atomic radii increases down the group but decreases across the period. Remember that these elements are at the head of the period to which they belong hence they have the highest atomic radii.
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I need the answer multiple choice
Answer:
it's answer is
element of an atom ✌️