Answer: a,
endothermic with the release of energy
The central dense region in an atom
Answer:
Explanation:
The nucleus is a small, dense region at the center of the atom. It consists of positive protons and neutral neutrons, so it has an overall positive charge. The nucleus is just a tiny part of the atom, but it contains virtually all of the atom's mass.
Which of these can be recycled in an attempt to conserve resources?
aluminum
natural gas
sunlight
gasoline
Answer:
aluminum
Explanation:
Hope this helped!!!
Tetrachloroethene, C2C14 is a solvent used in many dry cleaning processes.
Write the empirical formula for tetrachloroethene.
An empirical formula presents the atoms of all the elements with the most simplified whole number ratios. In other words, divide each subscript by their greatest common factor.
The greatest common factor of 2 and 4 is 2.
2/2 = 1
4/2 = 2
So, the empirical formula for tetrachloroethene is CCl₂.
The levels of organizations in multicellular organisms are shown below, but they are not in the correct order. Arrange the levels of organization in order from simplest to most complex.
The question is incomplete, the complete question is;
The levels of organizations in multicellular organisms are shown below, but they are not in the correct order. Arrange the levels of organization in order from simplest to most complex. tissues organs whole organisms organ systems
Answer:
tissues --> organs --> organ system --> whole organisms
Explanation:
The levels of organizations in multicellular organisms refers to the increasing complexity of the components of the organism.
A tissue is an aggregation of cells hence it is the lowest level of organization here.
Organs are an aggregation of tissues, this is the next higher level of organization.
Organ systems are an aggregation of organs, this is the next higher level of organization.
Whole organisms are an aggregation of organ systems. This is the highest level of organization.
What is the total number of grams of potassium fluoride
(molar mass = 58 g/mol) needed to make 9.4 liter of a 6.17 M solution?
Explanation:
molarity=no. of moles of solute/solution in litres
6.17M=no. of moles of solute/9.4 L
6.17×9.4=no. of moles of solute
57.9 =no. of moles of potassium fluoride KF
no. of moles=given mass /molar mass
57.9=given mass/58
3358.2 g
Which term describes this diagram?
A) Element
B) Compound
C) Mixture
Answer:
b
Explanation:
?
9. Oxygen will have a positive oxidation number
when combined with
(1) fluorine
(3) bromine
(2) chlorine
(4) iodine
in
Answer:
Flourine
Explanation:
Oxidation number will be +1 for oxygen and -1 for Flourine
Biotic and abiotic parts of an ecosystem can actually become limiting factors for a population. Which of the following are BIOTIC limiting factors?
Sunlight availability for growth of plants
Not enough grass for deer to eat
Drought on the Savannah of Africa
Flooding due a storm surge along coastal areas.
Answer:
Option B
Explanation:
Abiotic components are non living such as temperature, climate, rainfall, soil composition, wind, sunlight etc. While biotic components are living such as food, availability of mates, disease, and predators.
Here in this case, only option B represents a scenario where the unavailability of grass represents a biotic component
5.97 g of fluorene is added to 0.250 kg of benzene and it was
found that the freezing point of benzene decreased by 0.737
°C. What is the experimental molar mass of fluorene? Kf of
benzene = 5.12 K. kg/mol, van't Hoff factor of fluorene = 1.__g/mol
Answer:166
Explanation:
Food chains always begin with what type of organism? Why?
The Law of Conservation of Mass state
44 mL of H2CrO4 is needed to neutralize 176mL of a 10M solution of Pd(OH)4. What is the molarity of this solution?
Answer: The molarity of this solution is 2.5 M.
Explanation:
Given : [tex]V_1 = 44 mL[/tex], [tex]V_2 = 176 mL[/tex]
[tex]M_1 = 10 M[/tex]
Therefore, the value of molarity of the solution is calculated using following formula.
[tex]M_1 \times V_1 = M_2 \times V_2[/tex]
Substitute the values into above formula as follows.
[tex]M_1 \times V_1 = M_2 \times V_2\\10 M \times 44 mL = M_2 \times 176 mL\\M_2 = \frac{10 M \times 44 mL}{176 mL}\\= 2.5 M[/tex]
Hence, molarity of the solution is 2.5 M.
What is the volume, in liters, of 0.250 moles of carbon monoxide at STP?
Answer:
5and I carbon dioxide and water
Answer:
5.6 L
Explanation:
Calculated it leads to the answer 5.6L
Which of the following represents an increase in kinetic energy?
A. Cooling steam from 165°C to 100°C
B. Melting 45g of ice
C. Condensing 60g of steam
D. Heating ice from -50°C to 0°C
Answer:
C
Explanation:
The reason Senators are in office for 6 years is....(pick one of the following)
1) To separate Senators from the whims of the
general public.
2) to save money in elections
3) Because Senators are
required to be older
than representatives
What does the area between points D and E represent for the substance on the heating curve below?
A freezing point
B melting point
C boiling point
D sublimation point
Answer:
C. Boiling Point
Explanation:
A to B represents heat being added to the substance in a solid state, making B to C the melting point. C to D represents heat being added to the substance in a liquid state, making D to E the boiling point as the liquid is converted to a gas.
Hope this helps!
how to calculate density (what’s the formula)
density=_ divided by _
Answer:
density equals weigt divided by volume
Explanation:
[tex]density = \frac{m}{v} [/tex]
Use the following equation to answer the questions that follow.
Fe + 2 HCl --> FeCl2 + H2
a. If you have 3.000 moles of HCl, how many moles of gas could you make?
b. If you have 6.132 moles of each reactant, which one will run out first?
c. Based on your answer from (b), how many grams of FeCl2 would you expect to make?
d. How many moles of Excess Reactant reacted based on (b)?
e. How much Excess Reactant is left over, in moles, from (b)?
f. When actually carrying out the experiment with 6.132 moles of each reactant, you make 310.2grams of iron(II) chloride. What is your percent yield?
w
In your own words, what does the law of
conservation of energy tell us? Hint: It is
VERY similar to the law of conservation
of matter (we studied that in the first
semester).
Answer:
The law of conservation of mass States that matter can never be created or destroyed during c
Calculate the volume in mL of 53.2 g of .251M solution of HCl.
Show work please
Answer:
5.813 mL
Explanation:
You need to use the formula : vol = mass / molar mass x molarity
the molar mass of HCl is 36.46 and the problem gives you the rest of the equation
0.251M x 36.46 = 9.151
53.2g / 9.151 = 5.813 mL
*I don't know some of the units so that's why some of them are blank sorry
*I'm also sorry if this is wrong but it's what I did so..
which of these solution is most basic
Answer:
There is nothing to answer lol
Explain what is happening during a redox reaction.
Answer:
Redox is a sort of compound response where the oxidation conditions of particles are changed. Redox responses are described by the real or formal exchange of electrons between substance species, frequently with one animal groups going through oxidation while another species goes through decrease
Explanation:
Brainliest?
Please help i need help with this (if you can’t see the last one it says thermal)
Answer:
it would have sound a
thermal .why a train needs coal and coal get burned by heat that is thermal energy and sound beacuse a train makes sound by moving
Explanation:
have a good day /night
may i please have a branlliest
Observando la siguiente reacción química: 3Fe + 4H2 O Fe3 O4 + H2(g) 4. Contesta ¿Por qué si se lleva a cabo en el recipiente abierto, la reacción no puede ir en la dirección inversa, pero si la reacción se lleva a cabo en un recipiente cerrado, la reacción se convierte en reversible.
Answer:
La reacción se convierte en reversible porque en un recipiente cerrado el gas no escapa y puede reaccionar con el óxido
Explanation:
Basados en la reacción:
3Fe + 4H₂O → Fe₃O₄ + 4H₂(g)
3 moles de hierro con 4 moles de agua producen 1 mol de óxido de hierro y 4 moles de hidrógeno (gas)
Cuando la reacción se está produciendo con un recipiente abierto, todo el gas de hidrógeno está escapando a la atmósfera y no habrá forma de que reaccione con el óxido de hierro.
Pero, si el recipiente está cerrado, el hidrógeno no podrá escapar y podrá reaccionar con el óxido de hierro, así:
Fe₃O₄ + 4H₂(g) → 3Fe + 4H₂O
De esta manera,
la reacción se convierte en reversible porque en un recipiente cerrado el gas no escapa y puede reaccionar con el óxidoIn the Tough Man Competition, very strong men are challenged to push or pull extremely large and heavy objects to test their strength. In
one such challenge, they were asked to push one of two rail cars, an engine car and a box car. The data tables show one man's results.
Look over the data table and answer the questions below.
Force Applied by the
Tough Man
Did it move the
engine car?
No
Did it move the
boxcar?
No
1000 Newtons
2000 Newtons
No
No
3000 Newtons
Yes
No
The second period at the bottom of the table is called
Answer:
Actinides
Explanation:
The actinides are valuable primarily because they are radioactive.
PLEASE HELP
Find the kinetic energy of the horse using KE=1/2mv^2.
Answer:
78878
Explanation:
Explain why alkanes can be described as hydrocarbons.
Answer:
The International Union of Pure and Applied Chemistry (IUPAC) defines alkanes as "acyclic branched or unbranched hydrocarbons having the general formula CnH2n+2, and therefore consisting entirely of hydrogen atoms and saturated carbon atoms". ... The number of carbon atoms may be considered as the size of the alkane.A 50.00 L sample of gas collected in the upper atmosphere at a pressure of 18.30 torr is compressed into a volume of 0.1500 L. What is the final pressure?
Answer:
the ans is in the picture with the steps
(hope it helps can i plz have brainlist :D hehe)
Explanation:
The concept Boyles law is used here to determine the final pressure of the gas. Boyle's law was put forward by the Anglo-Irish chemist Robert Boyle in the year 1662. The final pressure of the gas is 7.66 atm.
What is Boyles law?At constant temperature, the volume of a given mass of gas is inversely proportional to its pressure. It can also be explained as at constant temperature, the product of pressure and volume of a given mass of gas is constant.
A straight line graph is obtained when pressure is plotted against the inverse of the volume.
Mathematically the law can be expressed as:
V∝ 1/P
PV = k (Constant)
Here 'V' is the volume and 'P' is the pressure of the gas.
For two different gases, the equation is given as:
P₁V₁ = P₂V₂
P₂ = P₁V₁ / V₂
1 torr = 0.00131 atm
P₁ = 0.023 atm
0.023 × 50.00 / 0.1500 = 7.66 atm
Thus the final pressure is 7.66 atm.
To know more about Boyles law, visit;
https://brainly.com/question/30367133
#SPJ2
An elastic band with a spring constant of 62 N/m is extended by 0.15 m. What is the force applied to the rubber band?
Answer:
the force applied to the rubber band is -9.3N
Explanation:
The computation of the force applied to the rubber band is shown below;
We know that
Force in newtons = Spring constant × amount of extension
F = -k × x
where
-k = 62 N/m
And, x = 0.15m
So, the force applied is
= -62N/m × 0.15m
= -9.3N
hence, the force applied to the rubber band is -9.3N
the force applied to the rubber band is -9.3N
Explanation: