Answer:
Na(s) + Cl2(g) = NaCl(s)
Nerve impulses are picked up by a neuron’s:
(1) dendrites
(2) axon
(3) synapse
(4) neurotransmitter
Zn(s) =PbCI2(aq) ZnCI2(aq)+Pb(s) reaction type
Answer:
Redox reaction
Explanation:
What is the mass in grams of 35.5 amu? Enter your answer in scientific notation.
Answer:
5.89X10^-23 g
Explanation:
1 amu is 1.6605X10^-24 g. By multiplying 35.5 amu by 1.6605X10^-24 g / 1 amu, you cancel out the amu and convert to grams: 5.89X10^-23 g
Which of the following is a binary ionic compound?
a Sulfuric acid
b Hydrogen sulfide
с
Sodium fluoride
d None of the above
Answer:
D; none of the above
Explanation:
Binary ionic compounds are composed of one metal and one nonmental.The metals are always the first element whereas the nonmetals are the second element.
Answer: Sodium fluoride
Four moles of CO2
a mass of how many grams
Answer: = 17.6
Explanation:
Molar mass of CO2 = 44 g mol-1
Mass of 1 mole of CO2 = 44 g
Mass of 0.4 mole = 44 x 0.4
= 17.6g
Answer:
the answer is 17.6 that's what I got
Grasses living in an area have shallow but widespread roots that grab
the ground. They can grow their leaves fast even after losing them.
What can we say about these plants?
How do we determine climate?
a
I have no idea
b
Precipitation and weather
c
Temperature and weather
d
Precipitation and temperature
Answer:
D but I’m traitor figure out y my question is precipitation helps determine climate by. Weathe. My options are The interaction of the prevailing winds upon land or oceans. The development of local storms. The passage of weather fronts. All of the above
Explanation:
What happens to the chemical energy in methane's bonds
when methane reacts with oxygen and forms H20 and CO,?
Answer: chemical energy is converted to heat and light energy
Explanation: exothermic reaction
4CH3+7O2–>6 H2O+4CO2+energy
Arrange the values according to magnitude greatest to least 8.2*10^—6, 65000, 1.1*10^2, 3.3*10^-2, and 9.0*10^-6.
Answer:
65000 > 110 > 0.033 > 0.0000090 > 0.0000082.
Explanation:
Hello there!
In this case, since those numbers are given in scientific notation, it turns out relevant to express them in standard notation as shown below:
0.0000082
65000
110
0.033
0.0000090
Thus, by arranging them from greatest to least, we obtain:
65000 > 110 > 0.033 > 0.0000090 > 0.0000082
Best regards!
The sexual reproduction of plants occurs through what process? (2 points)
a
Finalization
b
Fermentation
c
Pollen production
d
Pollination
Answer:
Pollination
Explanation: Involves production of male and female. Sexual reproduction is also the flowering of plants.
The study of the interaction between animals and plants within a specific environment is called
Answer:
The study is called ecology
Explanation:
Mark as brainliest if I'm correct
Answer:
i think its ecology im not sure since im bad at math lol
Help plzzzzz it's due today ----- Would Shining light on the reaction increase or decrease the reaction rate
Answer:
increase
Explanation:
Reactions that are initiated by light are called photochemical reactions. The brighter the light, the faster the reaction.
Answer: An increase in temperature typically increases the rate of reaction. An increase in temperature will raise the average kinetic energy of the reactant molecules. Therefore, a greater proportion of molecules will have the minimum energy necessary for an effective collision (Figure. 17.5 “Temperature and Reaction Rate”).
Explanation:
What is the change in enthalpy for a reaction if the reactants have 270 kJ of energy and the products have 150 kJ of energy
Answer-150 kj
Explanation:
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Which element is malleable and ductile?
A. Phosphorus
B. Argon
C. Sodium
D. Chlorine
Can you help me answer all of these I’ll mark brainliest
Answer:
C.) Sodium
Explanation:
Sodium is an "Alkali Metal"
Buffers are substances that help resist shifts in pH by Question 10 options: 1) releasing H in acidic solutions. 2) donating H to a solution when they have been depleted. 3) releasing OH- in basic solutions. 4) accepting H when the are in excess. 5) donating H to a solution when they have been depleted and accepting H when the are in excess.
Answer:
5) donating H to a solution when they have been depleted and accepting H when they are in excess.
Explanation:
A buffer solution is a solution that undergoes a negligible change in pH in addition of moderate quantities of acid or alkali. In other words, a buffer solution is one that resists a change in pH on addition or dilution of small amounts of acids or alkalis.
So, from the given question:
Buffers are substances that help resist shifts in pH by donating H to a solution when they have been depleted and accepting H when they are in excess.
How many moles of magnesium (Mg) are there in 96.3 g of Mg?
Explanation:
number of moles = m/Mr and the process is in the picture
Xylem is a plant tissue made up of elongated cells stacked end to end the length of the plant’s stem. Which function is xylem specifically adapted to perform in plants?
A. Help prevent water loss.
B. Exchange gases with the atmosphere.
C. Capture sunlight for photosynthesis.
D. Transport water from roots to leaves.
Answer: Option D.
Transport water from roots to leaves.
Explanation:
This is because xylem is one of the vascular tissues in plants that consist of specialized conducting cells known as treachery elements which transport water and other nutrients from the root to stem and the leaves of plants. It also give physical support to plants or give strength to plants.
Which statement best describes how an electromagnetic motor works?
Electrons are moved through a magnet, creating a circuit. That circuit interacts with a current, moving the
conductor in the orientation of the field
Electrons are moved through a current, creating a circuit. That circuit interacts with a magnet, moving the
conductor in the onentation of the field.
Elections are moved through a circuit, creating a current That current interacts with a magnet, moving the
conductor in the orientation of the field
Electrons are moved through a magnet creating a current. That current interacts with a circuit, moving the
conductor in the onentation of the field
Answer:
electrons are moved through a magnet creating a current. the current instracts with a circuit, moving the conductor in the onentation of the field
what element has 1 proton, 1 neutron, and 2 electrons?
Answer:
Tritium
Tritium is a hydrogen isotope consisting of one proton, two neutrons and one electron. It is radioactive, with a half-life of 12.32 years.
Explanation:
hope it helps :)))
The element which possess one neutron, one proton and two electrons is helium, He. The atomic number of helium is 2 in periodic table and have a mass number of 4 also.
What is helium ?Helium is second element in the periodic table. It is a noble gas and thus unreactive because its valence shell is completely filled and thus helium is placed in the noble gas group 18.
Atomic number of an element is number of electrons in it. For a neutral atom the number of electrons and protons are equal. Thus, all the positive charges is neutralised by equal number of electrons.
Neutrons have no charge and thus, they are neutral. Atoms forms positive ions when number of protons dominate and they will form negative ions if they gain electron and thus number of electrons dominates.
The sum of number of protons and neutrons is called mass number of the element. Helium contains 2 neutron and 2 oproton, thus its mass number is 4 and its atomic number is two.
To find more about helium, refer the link below:
https://brainly.com/question/1780577
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Due to changes in the environment, having lighter-colored fur becomes a
survival advantage in a population of wolves.
What is most likely to happen in the next generation?
Answer:
There will be more light-colored wolves.
Explanation:
Evolution is based off the survival of those with the most advantages in the wild. Since their light coat gives them a survival advantage, they will reproduce more.
Las capas del lecho marino del Mar Mediterráneo cuentan la historia de los cambios ambientales en el hoy desértico norte de Africa desde hace 160.000 años, haciendo uso de la regla de tres simple y notación científica indicar a cuántas décadas corresponde este periodo de tiempo con procedimiento
Answer:
160.000 años corresponde a 16.000 décadas.
Explanation:
Para resolver correctamente el ejercicio debemos plantear la regla de tres simple de la siguiente manera:
1 década equivale a 10 años; A cuantas decadas equivalen 160.000 años?
1 década→10 años
x ←160.000 años
Debemos multiplicar 160.000 por 1 y luego dividir entre 10 ;
x=([tex]\frac{160.000x1}{10}[/tex])=16.000 décadas; en notación científica sería 16x10^3.
Respuesta: 160.000 años corresponde a 16.000 décadas.
Compound X has a molar mass of 416.48 g mol
and the following composition:
element
mass 0/0
phosphorus
14.87%
chlorine
85.13%
Write the molecular formula of X.
Answer:
P₂Cl₁₀
Explanation:
From the question given above, the following data were obtained:
Molar mass of compound X = 416.48 g/mol
Percentage of phosphorus (P) = 14.87%
Percentage of Chlorine (Cl) = 85.13%
Molecular formula of X =?
Next, we shall determine the empirical formula of compound X. This can be obtained as follow:
P = 14.87%
Cl = 85.13%
Divide by their molar mass
P = 14.87 / 31 = 0.480
Cl = 85.13 / 35.5 = 2.398
Divide by the smallest
P = 0.480 / 0.480 = 1
Cl = 2.398 / 0.480 = 5
Empirical formula of compound X is PCl₅
Finally, we shall determine the molecular formula of compound X. This can be obtained as follow:
Molar mass of compound X = 416.48 g/mol
Empirical formula = PCl₅
Molecular formula =?
Molecular formula= [Empirical formula]ₙ
[PCl₅]ₙ = 416.48
[31 + (35.5 × 5)]ₙ = 416.48
[31 + 177.5]n = 416.48
208.5n = 416.48
Divide both side by 208.5
n = 416.48 / 208.5
n = 2
Molecular formula = [PCl₅]ₙ
Molecular formula = [PCl₅]₂
Molecular formula = P₂Cl₁₀
Therefore, the molecular formula of compound X is P₂Cl₁₀
What is the total number of electrons in the second energy shell of a calcium atom in the ground state
Answer:
8 electrons
Explanation:
The atomic number of calcium (ca) is 20. Therefore,
in the first shell the number of electrons are 2
in second shell the number of electrons are 8
in the third shell the number of electrons are 8
in the fourth shell the number of electrons are 2
electronic configuration in ground state:
1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 4s^2
Hope it helps u (｡◕‿◕｡)
1. The number density of conduction electrons in pure silicon at room temperature is about 11016m3. By doping with phosphorous, you desire to increase this number by a factor of 1 million(106). At room temperature, assume that the thermal energy is sufficient that all of the extraelectrons from the P doping enter the conduction band. What fraction of silicon atoms must youreplace with phosphorous atoms
This question is incomplete, the complete question is;
The number density of conduction electrons in pure silicon at room temperature is about 10¹⁶ m⁻³. By doping with phosphorous, you desire to increase this number by a factor of 1 million (10⁶). At room temperature, assume that the thermal energy is sufficient that all of the extra electrons from the P doping enter the conduction band. What fraction of silicon atoms must you replace with phosphorous atoms
Answer:
the fraction of silicon atoms we must replace with phosphorous atoms is 4( 10⁶ - 1 )
Explanation:
Given that;
the number density no = 10¹⁶ m⁻³
Required no = (10¹⁶ × 10⁶) = 10²² m⁻³
Each silicon atom has 4 valence electron,
Hence; Silicon density = 10¹⁶/4
now, if x = No of silicon atoms to be replaced with phosphorous, then;
(10¹⁶/4 - x)4 + 5x = 10²²
10¹⁶ - 4x + 5x = 10²²
10¹⁶ + x = 10²²
x = 10²² - 10¹⁶
Fraction of silicon atoms will be;
⇒ 10²² - 10¹⁶ / 10¹⁶/4
⇒ 4( 10²² - 10¹⁶ / 10¹⁶ )
⇒ 4( 10²²/10¹⁶ - 10¹⁶/10¹⁶ )
⇒ 4( 10⁶ - 1 )
Therefore, the fraction of silicon atoms we must replace with phosphorous atoms is 4( 10⁶ - 1 )
1. Oxygen gas has a pressure of 680 mmHg. What is the pressure in atmospheres?
If a sample of oxygen gas occupies 30.0 mL at -10°C and 680 mmHg, what is the volume at 10°C and 310 mmHg? Express your answer to two significant figures and include the appropriate units.
4. A new compound X has been made, and a 5 x 10-4 Molar solution of it gives an absorbance of 0.405 at the maximum absorbance of 265 nm. The path length of the UV cell is 0.5cm.
Use Beer’s Law to calculate the Molar Absorptivity coefficient of Compound X at this wavelength, quoting the correct units.
Answer:
1620 cm⁻¹·M⁻¹
Explanation:
Beer's Law states that:
A = ε * b * C
Where A is the absorbance, ε is the Molar Absorptivity coefficient, b is the path length, and C is the molar concentration.
Use the given data:
0.405 = ε * 0.5 cm * 5x10⁻⁴ M
And solve for ε:
ε = 1620 cm⁻¹·M⁻¹
So the Molar Absorptivity coefficient of Compound X at this 265 nm is 1620 cm⁻¹·M⁻¹.
Which conditions suggest that a bond will be ionic
if solution conduct electricity then it will ionic bond
How many atoms of which elements are represented by the following formula?
C6H12N
Answer:
19 atoms
Explanation:
6 carbon, 12 hydrogen, one Nitrogen
Cytokinesis happens differently for plant and animal cells. Both separate cytoplasm between two new daughter cells. However, which type of cell cytokinesis has the old cell membrane begin changing into a new cell wall between the two connected newly formed daughter cells?
Question 1 options:
Both
Plant cell cytokinesis
Animal cell cytokinesis
Neither
50 points need answer will give crown
Answer:
C
Explanation:
What does electric current measure?
O how well electrical energy moves in a circuit
O how quickly electrical energy moves in a circuit
O how frequently electrical energy moves in a circuit
O how much electrical energy moves in a circuit
Answer:
Explanation:
Electric current in a wire, where the charge carriers are electrons, is a measure of the quantity of charge passing any point of the wire per unit of time. ... Current is usually denoted by the symbol I. Ohm's law relates the current flowing through a conductor to the voltage V and resistance R; that is, V = IR.
Answer: O how well electrical energy moves in a circuit
Explanation: Electric current is a measure of the flow of charge, as, for example, charge flowing through a wire. Electric current in a wire, where the charge carriers are electrons, is a measure of the quantity of charge passing any point of the wire per unit of time.