Answer:
120 gram sample of a radioactive element, how many grams of that element will be left after 3 half-lives have passed? If you have a 300
Explanation:
Hope this helps!
How does ice make room temperature water so cold so fast? Does the water from the ice melting off when the room temp water hits the ice cube make it cold?
Answer:
ice absorbs heat from water.
Explanation:
Heat is a measure of molecular activity: the faster a thing's molecules move, the more heat that substance contains. And because everything is made of molecules, and molecules are in constant motion, everything contains at least some heat.
Because ice molecules move slowly and cluster tightly together, they produce a relatively low amount of heat. When ice is placed in a glass of water whose molecules are moving at a greater rate, the ice begins to absorb energy, because heat always travels from regions of relative warmth to colder areas in order to equalize temperatures. In other words, ice absorbs heat from the water.
As the water molecules lose energy, they begin to slow down, and consequently cool. So, it's kind of the opposite of what you might think: when we put ice in water, the ice doesn't give its cold to the water, it takes heat from the water.
A cylinder of an ideal gas contains 1.2 moles of gas and occupies a volume of 5.0L. If 0.5 moles of a second gas are added to the cylinder, and the cylinder is allowed to expand until it reaches the same temperature and pressure as before, what is the final volume of gas, in liters, that occupies the cylinder?
Answer:
7.08 L
Explanation:
From the question given above, the following data were obtained:
Initial mole (n₁) = 1.2 moles
Initial volume (V₁) = 5 L
Final mole (n₂) = 1.2 + 0.5 = 1.7 moles
Final volume (V₂) =?
From ideal gas equation,
PV = nRT
Divide both by n
PV / n = RT
Divide both side by P
V / n = RT/P
RT/P => constant
Therefore,
V₁ / n₁ = V₂ / n₂
With the above formula i.e
V₁/n₁ = V₂/n₂
We can obtain the final volume of the gas as follow:
Initial mole (n₁) = 1.2 moles
Initial volume (V₁) = 5 L
Final mole (n₂) = 1.7 moles
Final volume (V₂) =?
V₁/n₁ = V₂/n₂
5 / 1.2 = V₂ / 1.7
Cross multiply
5 × 1.7 = 1.2 × V₂
8.5 = 1.2 × V₂
Divide both side by 1.2
V₂ = 8.5 / 1.2
V₂ = 7.08 L
Therefore, the final volume of the gas is 7.08 L
PLS HELP DECODE THIS
The element symbol for Potassium: (B2)
Answer:
It the letter K
Explanation:
Potassium chlorate is a white, crystalline solid. It can be broken down into potassium chloride (a salt)
and oxygen gas. For this chemical reaction write a:
a) Word equation
b) Skeletal equation (balanced)
Answer:
Notice that the number of atoms of
K
and
Cl
are the same on both sides, but the numbers of
O
atoms are not. There are 3
O
atoms on the the left side and 2 on the right. 3 and 2 are factors of 6, so add coefficients so that there are 6
O
atoms on both sides.
2KClO
3
(
s
)
+ heat
→
KCl(s)
+
3O
2
(
g
)
Now the
K
and
Cl
atoms are not balanced. There are 2 of each on the left and 1 of each on the right. Add a coefficient of 2 in front of
KCl
.
2KClO
3
(
s
)
+ heat
→
2KCl(s)
+
3O
2
(
g
)
The equation is now balanced with 2
K
atoms,
the use of carbon black
Answer:
Compared with other colorants, carbon black has a high coloring power. Therefore. it is used as ink for printing newspapers, as ink-jet toner, and for other such uses. It is also suitable as a pigment for heat-molded plastics, car fenders, coating for electric wires, and other products.
Explanation: Hope this helps. Branliest if possible. Thx
19.The Alkali and Alkaline Earth metals belong to which columns, respectively?
a.Column IA & IIA
b.Column VIIA & Column VIIIA
c.Column IIIA & IVA
Answer:
the alkali and the alkaline earth metals comprise the first two columns periodic table traditionally referred to as groups IA and iia. respectively (figure, 1).
Explanation:
the alkaline and alkali earth metals are a group of elements in the periodic table
In which way are plant and animals cells similar
Answer:
Both animal and plant cells are eukaryotic cells and have several similarities. The similarities include common organelles like cell membrane, cell nucleus, mitochondria, endoplasmic reticulum, ribosomes and golgi apparatus
Explanation:
hey both contain membrane-bound organelles such as the nucleus, mitochondria, endoplasmic reticulum, golgi apparatus, lysosomes, and peroxisomes.
Answer:
Plant and animal cells are very similar, because they are both, Eukaryotic Cells. They both contain membrane-bound organelles such as the: Nucleus, Mitochondria, Endoplasmic Reticulum, Golgi Apparatus, Lysosomes, and Peroxisomes.
Hope this helps.
x
CAN SOMEONE HELP ME PLEASE Evaluate, using the measurements and observations in Figure 8, whether ethanol or butanol is the
better fuel for heating the water.
Include calculations in your answer.
Answer:
ethanol
Explanation:
The better fuel for heating the water is ethanol as it burned with a clean blue flame.
What are the different colors of flame?The color of a flame can be red, orange, blue, yellow, or white. When extra chemicals are added to the fuel burning, it affects the frequencies of visible light radiation emitted.
The temperature of a flame is shown by its color and bright blue and has a temperature of about 1670 K. The temperature will drop as the color changes from yellow to orange. The cooler flame is often red and also forms smoke. The color of the flame also depends upon the supply of oxygen gas that is required to burn.
As mentioned in the observations of the ethanol and butanol. The ethanol burns the clean blue flame while butanol burns with a yellow sooty flame.
Therefore, ethanol is a better fuel for heating water than butanol.
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#SPJ2
How many moles are there in 1.27 x 10^24 atoms of potassium
Answer:
Explanation:
We know that, 1 mole of any substance contain 6.022 X 10^23 atoms/molecules.
Thus, 6.022 X 10^23 atoms = 1 mole
Therefore, 1.29x10^24 =
= 2.14
Thus, 2.14 moles are present in 1.29x10^24 hydrogen atoms in HF.
Please help me I need this done for today, please show your work on paper as well the answers for me to understand and copy.
How is atom important to all living and non-living things
Answer:
Atoms are extremely important structures that make up all of the materials on earth.
Explanation:
Atoms are in our bodies and they bond together to form molecules, which make up matter.
Answer:
Explanation:
[like living things non-living things have properties that u can see such as color,hardness,or softness]
[living things and non-living things are made of small particles called atoms]
ATOM made up everything that takes up space
6When the moon is between ___the Earth and the sun, a
appears.
A. Full Moon
b. New Moon
C. Quarter Moon
d. Gibbous moon
Answer:
B. New Moon!
Explanation:
New Moons are commonly seen as nearly or completely dark, this is because the rays of the sun completely overshadow the moon's "light," therefore making it appear dark.
what is a compound?
Answer:
NOUN
a thing that is composed of two or more separate elements; a mixture
Explanation:
basically a mixture
who invented the first compound microscope?
Answer:
Zacharias Janssen
Explanation:
Zacharias Janssen is known as the man who invented the compound microscope which is widely used today by most scientists all over the world.
The compound microscope was built in the 16th century during this period eyeglasses were just being introduceed to people all around.
Zacharias Jensen achieved this great feat with the help of his father Hans who was also anther great scientist, he mentored his son throughout the years and gave him the necessary skills and knowledge to produce the compound microscope.
Which of the following pairs of elements will form covalent bonds with each other?
Answer:
sorry I don't know so sorry so sorry so sorry so sorry so sorry so
Explanation:
so sorry I don't know so sorry so sorry so sorry maybe I think quotation ki and bro mind we are
A tissue is a group of ____________ organized to perform a specific function.
рахмаат эже Айюб в бишкек и мы стали его называть как
Answer:
brainliest please
Explanation:
A tissue is an ensemble of similar cells and their extracellular matrix from the same origin that together carry out a specific function. Organs are then formed by the functional grouping together of multiple tissues.
A certain type of decorative lamp contains colored liquids. These liquids form globs that break off and rise to the top of the liquid. The globs rise due to____.
Answer:
The globs rises due to convection.
Explanation:
Convection is when warmer parts move to the top and the cooler parts move to the bottom. Since the globs are going to be warmer, they rise to the top.
Hope this helps :D
¿Qué elemento rompe la regla del carácter metálico?
Which element breaks the rule of metallic character?
Answer:
the machete
Explanation:
:)
name and define the quantity represented by H
Answer:
Molar enthalpy change, the enthalpy change for one mole of a pure substance
Explanation: i think
A rock that falls off a cliff represents both potential and kinetic energy. Which statement best represents the energy transformation involved in this scenario? As the potential energy decreases, the kinetic energy decreases. As the potential energy decreases, the kinetic energy decreases. As the potential energy increases, the kinetic energy increases. As the potential energy increases, the kinetic energy increases. As the potential energy decreases, the kinetic energy increases. As the potential energy decreases, the kinetic energy increases. As the potential energy increases, the kinetic energy stays the same
Answer:
as the potential energy decrease the kinetic energy increases
Explanation:
at the cliff it possess maximum potential energy but as it falls it possess maximum Kinetic energy
When the rock is still stationary at a height, it possess all potential energy. As it begins to fall from the height, potential energy decreases and kinetic energy increases.
Energy transformations involve the change of energy from one form to another in accordance with the principle of energy conservation.
For a rock found at a height, all it has is potential energy. This potential energy decreases when the rock begins to fall and kinetic energy increases accordingly.
Hence, for a rock that falls off a cliff, as the potential energy increases, the kinetic energy increases.
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A solution in which more solute particles are there called
Answer:
solute
Explanation:
solid particles are called solutes
liquid as solvents
in most of the cases
but may be different in few cases
Answer:
unsaturated solution
Explanation:
An unsaturated solution is defined as a solution In which more solute can be dissolved at the same temperature. Supersaturated: A supersaturated solution is defined as a solution in which excess solute is dissolved than required for the formation of a saturated solution.
How many particles would be found in 2.38 g of (NH4)3PO4
The number of particles in 2.38 g ammonium phosphate are [tex]\rm \bold{9.0345\;\times\;10^2^1}[/tex].
The number of particles in a mole of sample is given by Avogadro law. The number of particles in a mole of a sample is equivalent to [tex]\rm 6.023\;\times\;10^2^3[/tex].
Computation for number of molecules in [tex]\rm (NH_4)_3PO_4[/tex]The given mass of ammonium phosphate is 2.38 g.
The molar mass of ammonium phosphate is 149 g/mol
The moles of the sample is given as:
[tex]\rm Moles=\dfrac{Mass}{Molar\;mass} \\\\Moles\;(NH_4)_3PO_4=\dfrac{2.38\;g}{149\;g/mol}\\\\ Moles\;(NH_4)_3PO_4=0.015\;mol[/tex]
The available moles of ammonium phosphate is 0.015 mol.
According to Avogadro's law, the number of particles in the sample is given as:
[tex]\rm 1\;mol=6.023\;\times\;10^2^3\;particles\\\\0..015\;mol=\dfrac{6.023\;\times\;10^2^3\;particles}{1\;mol}\;\times\;0.015\;mol\\\\ 0.015\;mol=9.0345\;\times\;10^2^1\;particles[/tex]
The number of particles in 2.38 g ammonium phosphate are [tex]\rm \bold{9.0345\;\times\;10^2^1}[/tex].
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Unit 2 Test
What level of a food chain is most likely to have the most energy?
o producer
herbivore
consumer
decomposer
Answer:
the answer to this question is producer
CAN SOMEONE PLEASE CHECK MY ANSWER!!!
If it’s wrong please correct me!!!
*will mark brainliest*
yes the answer is right bro
Earth is a part of the galaxy known as the-
Triangulum galaxy.
Omega Centauri.
Andromeda galaxy.
Milky Way.
Answer:
its milky way galaxy..........
HELP!!!
6.12 moles of Na3PO4 experimentally produced 1001g of sodium chloride according to the equation below. What is the percent yield?
2Na3PO4 + 3 CaCl2 --> Ca3(PO4)2 + 6NaCl
Answer:
155.5%
Explanation:
from the equation
2mol of Na3PO4 reacts to give 6mol of Nacl
therefore 6.12mol of Na3PO4 will give 18.36mol of Nacl
2mol Na3PO4............ 6mol of nacl
6.12mol NaPO4.......... 6×6.12mol/2mol = 18.36mol of Nacl
mass of Nacl = mol × molar mass
where molar mass of Nacl= 23+12=35g/mol
mass of Nacl= 18.36 × 35= 642.6g of Nacl
percentage yield = actual yield/ theoretical yield ×100%
percentage yield= 1001g (given)/642.6g(used) ×100 = 155.5%
Answer:
107%
Explanation
6.12 mol Na3Po4 | 6 mol NaCl | 58.44 g NaCl
______________________________________ = 1072g NaCl
| 2 mol Na3Po4 | 1 mol NaCl
1072g/1001g x 100= 107%
can someone plz help me im running out of time !!!!
Balance the chemical equation below using the smallest possible whole number
stoichiometric coefficients.
Q1= C(s)+H2(g) -> C2H6(g)
Q2= NH3(g)+O2(g)-> HCN(aq)+H2O(l)
Answer:
1. C(2)+H2(1) -> C2H6(1)
2. NH3(2)+O2(3)-> HCN(2)+H2O(3)
I am not sure about the second one.
Helppp 88.0 grams of Boron, how many atoms of Boron (B) are present?
Answer:
There are no atoms becuase atoms are not in elements.
Explanation:
which pair will for an ionic compound
Answer: A pair of elements will most likely form an ionic bond if one is a metal and one is a nonmetal. These types of ionic compounds are composed of monatomic cations and anions.
Explanation:
A pair of elements will most likely form an ionic bond if one is a metal and one is a nonmetal. These types of ionic compounds are composed of monatomic cations and anions.
Explanation:
The chart below shows monatomic ions formed when an atom loses or gains one or more electrons, and the ionic compounds they form. You can check your periodic table to see that the cations are monatomic ions formed from metals, and the anions are monatomic ions formed from nonmetals.
Our bodies use nitrogen
Question 2 options:
directly from the air
after bacteria make N into ammonia molecules
from the plants and other animals we eat
all of the above
it's the 1 and 3 I think it's that hopefully it's right