Answer:
what are the options to the question
Answer:
b and c
Explanation:
just took it on edge :)
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
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]
A K+ ion is similar to a Cl– ion in that they both have the same A) nuclear charge B) number of electrons C) atomic number D) number of protons
Answer:
B) number of electrons
Explanation:
The two species:
K+ and Cl- have the same number of electrons.
A neutral atom of K has 19 electrons
A neutral atom of Cl has 17 electrons
Now,
To form K+, K will have to lose an electron and then the number of electrons becomes 18
To form Cl-, Cl will have to gain an electrons and then the number of electrons becomes 18
So, therefore, the number of electrons on both species is 18
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]
What type of conservation tillage leaves the greatest amount of soil cover by crop residues? What are the advantages and disadvantages of this system?
Answer:
No-till conservation tillage
Explanation:
No till conservation involves the soil not being touched which gives rise to a large amount of organic matter being left on the surface.
The Advantage of this method is that it helps to prevent erosion such as that of wind and water due to the little or no exposure of the soil surface and helps to provide nutrients to the plants through the organic matter present.
The Disadvantage of this method is its heavy reliance of chemicals such as herbicides in killing the weeds in order to prevent competition for vital compounds with the main plants.
help me please I need to pass.
Answer:
2 C Atoms
Explanation:
When you have coefficient of 2 next to a compound element, it indicates there are 2 of each compound element. In the compound element, there is one C Atom, and 2×1 is 2.
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.
What is the percent composition for dihydrogen monoxide?
Answer:
I think the answer is 11.190% :)
Explanation:
Hope this helps <3
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.
For more information about the exothermic reaction, refer to the link:
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Which of the following elements has the highest electronegativity?
*potassium
*lithium
*chlorine
*oxygen
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
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
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:
PLEASE HELP! DUE in 5 minutes
Answer:
Fluorine-18
Explanation:
An isotope is an element with different amounts of neutrons. The element itself will not change.
How 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).
Learn more about limiting reactants here:
brainly.com/question/14225536
I hope it helps you!
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
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
Which has a higher melting point KF or NaF?
Answer:
NaF
Explanation:
Melting point of NaF is 993°C but Melting point of KF is 858°C
Answer:
I think naf
Explanation:
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.
Match each item with the correct statement below.
a.
Intramolecular force
d.
Intermolecular forces
b.
tetrahedral
e.
London dispersion Forces (LDFs)
c.
linear
____ 1. An intermolecular force that occurs between two molecules of Br2 is formed by?____
____ 2. Is a force that occurs within molecules and compounds.
____ 3. Dipole – dipole, Hydrogen Bond, and London dispersion Forces are examples of what type of force?
____ 4. Is the molecular shape of HI.
__ 5. the molecular shape of CH4
1. LDFs
2. Intermolecular Forces
3. Intramolecular Forces
4. Linear
5. Tetrahedral
Edit: I'm new to this site and idk how to use it properly. I'm not sure about 2 and 3 currently because these forces are between molecules as well so INTERmolecular would be used twice (?)
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 togetherComo 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.
A gas us a pressure of 800 kPa at 327 degree C. What will be its pressure at 27 degree C, if the volume does not change?
A. 400 kPa
B. 1,600 kPa
C. 668 kPa
D. 958 kPa
Answer:
Ooo gas laws! fun! the answer is B, 1600 kPa
Explanation:
Here are some key things to remember:
- to convert Celsius to Kelvin add 273
- we are using the equation [tex]P1 x T1 = P2 x T2[/tex] our given variables:P1=800kPa T1= 327 + 273 = 600 KP2= ? (decrease)T2= 27+ 273 = 300 K- rearrange our equation and plug in the numbers to solve.[tex]P2= \frac{P1 x T1}{T2}[/tex][tex]800 kPa = \frac{600 K}{300 K}[/tex]- Our Kelvin cancels out so that leaves us with the measurment of kPa. When the numbers are solved out, you get 1600 kPa5. 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.
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.
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
Which of the following chemical formulas CANNOT be simplified into an empirical formula?
a) C4H16O5
b) N8H4F4
c) Ca2Br4
d) Mg5I10
Answer:
The answer is a) [tex]C_{4} H_{16} O_{5}[/tex]
Explanation:
The other chemical formulas' subscripts share a common factor, so they can be simplified to an empirical formula, however, the subscripts in [tex]C_{4} H_{16} O_{5}[/tex] cannot be simplified any further, because they do not share any more whole-number factors with each other.
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
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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