Answer:
Atomic radius is the distance from the atom's nucleus to the outer edge of the electron cloud. In general, atomic radius decreases across a period and increases down a group. Across a period, effective nuclear charge increases as electron shielding remains constant.
Explanation:
Which of these share chemical bonds
Mixtures
all matter
Compounds
Answer:
Compounds
Explanation:
All compounds of a substance shares chemical bonds between them and their structures.
The bonds can come in different forms. Compound are held by chemical bonds within their atoms.
Mixtures are composed of different atoms and compoundsThey are mostly not chemically bonded togetherMixtures can be separated by physical means because they lack bonds between them. Compounds are chemically bonded togetherHow many moles of sodium cyanide (NaCN) would be needed to
produce 4.2 moles of sodium sulfate (Na2SO4)? (4 points)
H2SO4 + 2NaCN → 2HCN + Na2SO4
O 2.1 mol NaCN
O 4.2 mol NaCN
O 8.4 mol NaCN
O 12.0 mol NaCN
Answer:
c
Explanation:
8.4
For the reaction H₂SO₄ + 2NaC≡N → 2HC≡N + Na₂SO₄, we have that 8.4 moles of sodium cyanide are needed to produce 4.2 moles of sodium sulfate (option C).
The reaction between sodium cyanide and sulfuric acid is:
H₂SO₄ + 2NaC≡N → 2HC≡N + Na₂SO₄
We can find the number of moles of sodium cyanide, assuming that it is the limiting reactant and knowing that 2 moles of it produce 1 mol of sodium sulfate, as follows:
[tex] n_{NaC\equiv N} = \frac{2\: moles\: NaC\equiv N}{1 \: mol\: Na_{2}SO_{4}}*4.2 \: moles\: Na_{2}SO_{4} = 8.4 \: moles [/tex]
Therefore, 8.4 moles of sodium cyanide are needed to produce 4.2 moles of sodium sulfate (option C).
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5. Where are red blood cells produced?
10 points
a. in the heart
b. in the blood vessels
c. in bone marrow
d. in the plasma
Answer:
C
Explanation:
In the bone marrow, red blood cells are produced
For an object to remain at rest, which of the following must be true?
The forces on it are balanced
There is no friction
Gravity does not act on it
The object has no mass
Answer: I believe that it is that the forces are balanced.
Explanation:
What is the percent composition for dihydrogen monoxide?
Answer:
I think the answer is 11.190% :)
Explanation:
Hope this helps <3
Approximately how many joules of heat are required to raise the temperature of 20 grams of water from 30°C to 40°C?
A
134 J
B
168 )
C.
420 j
D.
840 J
The heat required : 840 J
Further explanationGiven
mass of water = 20 g
Temperature : 30°C to 40°C
Required
Heat to raise the temperature
Solution
Heat can be calculated using the formula:
Q = mc∆T
Q = heat, J
m = mass, g
c = specific heat, joules / g ° C (for water= 4.18 J/g° C)
∆T = temperature difference, ° C / K
The heat :
[tex]\tt Q=20\times 4.2\times (40-30)\\\\Q=\boxed{\bold{840~J}}[/tex]
Stop telling people how you feel they do not wanna hear you're problems tell them to God man these people don't care what you gotta say I just had to tell y'all this and write it in a notebook please I'm tryna tell y'all that's the key kings and queens stay humble 2021 is the new year and new u
Answer:
Preach!
Explanation:
Como se consiguió el interior de un atomo
Answer:
A través del Experimento de Rutherford.
Explanation:
El experimento de la lámina de oro fue realizado en 1909 por Ernest Marsden y Hans Geiger bajo el liderazgo de Ernest Rutherford. En este experimento, se bombardeó una lámina de oro con partículas alfa y se detectó su dispersión. Se encontró que una pequeña proporción de las partículas regresan cerca de la fuente. Estos resultados fueron la base para el lanzamiento de un nuevo modelo atómico con un núcleo central cargado positivamente y con electrones cargados negativamente con pequeñas masas en relación con el núcleo y distribuidos a su alrededor.
What object do you think will take up
more space? Why do you think this?
Answer:
solids
Explanation:
BC they r heavier than liquid and gas
my mom is making SPAGET
Answer:
yes
Explanation:
Base your answers to questions 74 through 76 on the data table below and on your knowledge of Earth
science. The data table shows the mass of a sample of radioactive carbon-14 remaining after each half-life.
Data Table
Number of Half-lives Mass of Carbon-14 (9)
0
64
1
32
2
16
8
3
4
4
5
2
6
1
74 On the grid in your answer booklet, construct a line graph by plotting the data for the mass of carbon-14 in
the sample for each half-life shown on the data table. Connect the plots with a line. [1]
75 Identify the stable disintegration product of the radioactive isotope carbon-14. [1]
76 Determine the number of grams of carbon-14 remaining in this sample at 17,100 years. [1]
Answer:
See explanation
Explanation:
Now we have, the graph attached.the stable disintegration product of C-14 is N-14.
Then;
Since the mass of C-14 originally present is 64g, at a time t= 17100 years, we will have;
N/No = (1/2)^t/t1/2
N = mass of C-14 at time t
No= mass C-14 originally present
t = time taken for N amount of C-14 to remain
No = mass of C-14 originally present
t1/2 = half life of C-14
N/64 = (1/2)^17,100/5730
N/64 = (1/2)^3
N/64 = 1/8
8N = 64
N = 8 g
1. Which type of blood cell is the most numerous in the body?
O a. red blood cells
O b. white blood cells
c. platelets
d. plasma
Answer:
red blood cells
Explanation:
I'm not so sure though
Explain how the complexity and diversity of living things has changed over time.
Answer:A complex biological structure with many interacting parts might appear, at first glance, as if it were originally created in its present form with all its interlocking components fully formed and intact. It doesn’t seem possible that they developed step by step via biological evolution. In Darwin’s Black Box, Michael Behe introduces a term that he and other proponents of Intelligent Design use for this concept: irreducible complexity. No part of an irreducibly complex system has any apparent function except in its relation to the other parts.
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Using the diagram below and the labels attached to it answer the following:
Transverse Wave Anatomy
1. Define the crest and trough of a wave and identify TWO points that represents a crest or a trough.
2. Define wavelength and identify TWO points that could be used in the diagram to measure it.
2. Determine the frequency of this wave if the waves the diagram represents occurred within 1 second.
Answer & Explanation:
Crest is a point in the cycle where maximum or peak amplitude exists. In another way, it is a point on the positive side of a wave where maximum amplitude exits. Trough is a point in the cycle where minimum amplitude exists.
Crest: points A and E
Trough: points C and J
Wavelength is the distance between two crests or two troughs. One example is distance between points A and E.
Frequency is 3 because there are 3 oscillations in 1 second (follow the line from beginning to point D, then D to G, the G to end).
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A gas occupies 200ml at a temperature of 26 degrees Celsius and 76mmHg pressure. Find the volume at -3degree Celsius with the pressure remaining constant.
Answer:
184.62 ml
Explanation:
Let [tex]p_1, v_1,[/tex] and [tex]T_1[/tex] be the initial and [tex]p_2, v_2,[/tex] and [tex]T_2[/tex] be the final pressure, volume, and temperature of the gas respectively.
Given that the pressure remains constant, so
[tex]p_1=p_2[/tex] ...(i)
[tex]v_1[/tex] = 200 ml
[tex]T_1= 26 ^{\circ}C = 273+26 =299[/tex] K
[tex]T_2= 3 ^{\circ}C = 273+3 =276[/tex] K
From the ideal gas equation, pv=mRT
Where p is the pressure, v is the volume, T is the temperature in Kelvin, m is the mass of air in kg, R is the specific gas constant.
For the initial condition,
[tex]p_1v_1=mRT_1 \\\\mR= \frac{p_1v_1}{T_1}\cdots(ii)[/tex]
For the final condition,
[tex]p_2v_2=mRT_2 \\\\mR= \frac{p_2v_2}{T_2}\cdots(iii)[/tex]
Equating equation (i), and (ii)
[tex]\frac{p_1v_1}{T_1}=\frac{p_2v_2}{T_2}[/tex]
[tex]\frac{v_1}{T_1}=\frac{v_2}{T_2}[/tex] [from equation (i)]
[tex]v_2=\frac{T_2}{T_1} \times v_1[/tex]
Putting all the given values, we have
[tex]v_2=\frac{276}{299} \times 200 = 184.62 \; ml[/tex]
Hence, the volume of the gas at 3 degrees Celsius is 184.62 ml.
How would you define speed and the formula to find speed?
Answer:
Speed is how fast you cover a certain distance
[tex]Speed=\frac{Distance}{time}[/tex]
Limiting line of bakmer series result when electron jumps from orbit: A) 3 to 2 B) infinity to 2 C) 4 to 5 D) infinity to 1
Help please
When you have two
isotopes of an atom, Carbon-12 and Carbon-13 for example, what has changed in the atomic structure?
A. Number of protons
B. Number of electrons
C. Number of neutrons
which statements are wrong about atoms
Answer: Atoms are not able to exist independently
Explanation:
How many atoms are there in 1.225 moles of iron?
Show work
Answer:
1.2 × 10 to the power 25 . atoms of iron divide by a line 6.022× iron atoms per mole =~ 20 moles
Dr. Bert Vogelstein and his partners study the causes of cancer. In 2017, they published a study of 32 types of cancer. The study concluded that most cancer cases are caused by DNA replication errors. In fact, 66% of the cancer cases they studied were caused by random DNA replication errors. Environmental factors such as diet, sunburns, and smoking caused 29% of the cancers. The last 5% of cancers in the study were caused by inherited factors.
Briefly describe the steps of DNA replication and point out one place in the code where an error can occur.
Answer:
Error or mistakes during DNA replication is accountable for two-thirds or 66% of the cancer cases. These random and unpredictable errors called mutations that occur during the division of a cell as an error in copying of DNA.
DNA replication has three main steps:
Opening and separation of DNA strands of a helix - carried by an enzyme known as helicase that breaks the hydrogen bonds between nitrogenous bases of the helix of DNA.
The priming of the template strand - DNA primase helps RNA primers to bind to both strands at 3' end as soon as it separated
strat assembling the segments of new DNA on strands called elongation of the strands with help DNA polymerase I and after forming new strands the termination of the replication.
Errors or mistakes can occasionally take place if DNA polymerase inserts a wrong base during elongation of the strands.
A block of metal has dimensions of 2 cm by 5 cm by 6 cm. The block weighs 780 g. From this information, calculate the mass, volume and density.
Answer:
mass = 78 grams
volume= 2*5*6=60cm^3
density =m/v
=78/60
13/10=1.3 g/cm^3
Explanation:
The mass of the block of metal would be 780 grams
The volume of the block of metal would be 60 centimeter³
The density of the block of the metal is 13 g/cm³
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 density is the reciprocal of the specific volume of any substance.
ρ =m /v
As given in the problem a block of metal has dimensions of 2 cm by 5 cm by 6 cm. The block weighs 780 grams
The volume of the block of metal would be = 2×5×6 centimeter³
= 60 centimeter³
The mass of the block of metal = 780 grams
ρ =m /v
ρ = 780 /60 gram/ cm³
ρ = 13 g/cm³
Thus, the mass volume and the density of the block of the metal would be 780 grams , 60 centimeter³, and 13 g/cm³ respectively.
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Ethyl alcohols formula is C2H50H,what is this?
a.A element
b.A compound
c.A mixture
Explanation:
C2H5OH is ethanol, which is a compound.
A football player has to run 60 meters in 5 seconds or less in order to make the all-star team. What is the slowest speed he can run in order to qualify for the all-star team?
Explanation:
It is given that,
A football player has to run 60 meters in 5 seconds or less in order to make the all-star team.
We need to find the slowest speed he run in order to qualify for the all-star team. Let it is v. It can be calculated as follows :
v = d/t
= 60 m/5 s
= 12 m/s
It means his slowest speed is 12 m/s and he should increase his speed in order to qualify for the all-star team.
5. Which is NOT true about mixtures?
A. Mixtures are physical combination of only one substance.
B. Mixtures can be homogeneous and heterogeneous.
C. Mixtures are physical combination of two or more substance.
D. Mixtures can be separated in different processes.
2. Vessels that carry blood back to the heart are called
O a. capillaries
b. arteries
O c. veins
O d. both band c
Answer:
the answer for your question is veins
Answer:
blood vessels aka veins
In an exothermic reaction, the energy stored in the chemical bonds of the reactants is: (A) less than the energy stored in the bonds of the products. (B) equal to the total amount of energy released. (C) equal to the energy stored in the bonds of the products. (D) greater than the energy stored in the bonds of the products. My teacher told me it was A because of the idea with energy in - energy out. But when I searched it up, it was explained to be D. Which one is right?
Answer:
(D) greater than the energy stored in the bonds of the products.
Explanation:
Exothermic reaction refer to those reactions in which energy is released to the surrounding, unlike endothermic reactions where energy is absorbed from the surroundings.
In exothermic reactions, the change in energy; ΔH less than zero. That is, they are negative.
ΔH = H (products) - H (reactants)
For ΔH to have a negative value, it means the energy of reactant must be greater than the energy of products.
This means the correct option is;
(D) greater than the energy stored in the bonds of the products.
In an exothermic reaction the energy of the reactants bonds has been higher than the energy of the product bonds. Thus, option D is correct.
The exothermic reaction has been given as the chemical reaction in which there has been the liberation of energy by the reactants in the process of formation of products.
The energy change in the reaction has been a negative value. In the process of product formation, the energy of the system has been conserved. It stated that the energy of the reactant has been equivalent to the energy of the product and the liberated energy.
With the product being consisted of less energy, the energy stored by the chemical bonds in the reactants has been higher than the energy stored by the product. Thus, option D is correct.
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A 488.3 gram sample of an unknown substance (MM = 92.41 g/mol) is heated from -23.1 °C to 51.8 °C. (heat capacity of solid = 2.96 J/g･°C; heat capacity of liquid = 1.75 J/g･°C; ∆Hfus = 8.04 kJ/mol; Tfinal = 17.6 °C) a)How much energy (in kJ) is absorbed/released to heat the solid? b)How much energy (in kJ) is absorbed/released to melt the solid? c)How much energy (in kJ) is absorbed/released to heat the liquid? d)What is the total amount of energy that must be absorbed/released for the entire process?
Answer:
a) The heat energy absorbed to heat the solid is approximately 58.8 kJ
b) The heat required to melt the solid is approximately 3.93 kJ
c) The heat required to heat the liquid is approximately 29.2 kJ
d) The total amount of energy, absorbed in the entire process is approximately 92 kJ
Explanation:
a) The given parameters are;
The mass of the substance = 488.3 grams
The molar mass of the sample = 92.41g/mol
The temperature change of the substance = -23.1°C to 51.8 °C
The heat capacity of the solid substance = 2.96 J/(g·°C)
The heat capacity of the liquid substance = 1.75 J/(g·°C)
ΔHfus = 8.04 kJ/mol
Taking the melting point temperature of the solid as Tfinal = 17.6 °C, we have;
The heat energy absorbed to heat the solid, Q₁ = 488.3 × 2.96 × (17.6 - (-23.1)) = 58826.4776 J ≈ 58.8 kJ
b) The heat required to melt the solid, Q₂ = ΔHfus × m = 8.04 × 488.3 = 3925.932 J ≈ 3.93 kJ
c) The heat required to heat the liquid, Q₃ = Mass × The specific heat capacity of the liquid × The change in temperature
Therefore;
Q₃ = 488.3 × 1.75 × (51.8 - 17.6) = 29224.755 J ≈ 29.2 kJ
d) The total amount of energy, absorbed in the entire process, ΔQ, is given as follows;
ΔQ = Q₁ + Q₂ + Q₃ = 58826.4776 J + 3925.932 J + 29224.755 J = 91,977.1646 J ≈ 92 kJ
Drag the tiles to the correct boxes to complete the pairs.
Match the genetic mutations with their names.
Answer:
See below!
Explanation:
Translocation ⇒ CCGGTT + TTAGGC = CCGGTA + GTTGGC
A translocation is a change in location between two chromsomes.
Inversion ⇒ CTTAAT = TAATTC
An inversion is when a gene is flipped.
Deletion ⇒ CGAGGTT = CGTT
A deletion is when a part of gene is deleted.
Duplication ⇒ ATTCGG = ATTCGGATTCGG
A duplication is when a gene is duplicated.
Insertion ⇒ CTTAAT = CTTAACGCT
An insertion is when nucleotide bases are inserted into a gene.
Substitution ⇒ CGAT = CTAT
A substitution is when part of a gene is replaced with a different base pair.
Help me plz I don’t know what it’s mean
Answer:
1 has the highest density because it has the most amount of circles in the least amount of space- it is the most densely filled with circles; it is the most dense.
Answer:
image 1 would have the highest density
Explanation:
the closer the molecules are the more solid an object is. if the molecules are far apart and rarely bump into eachother, it is more gaseous. the object in the middle (2) is a liquid
