Answer:
2. Livor Mortis.
Explanation:
The tannish markings standing out from the red markings helps to show if they have been moved from where they orginially had been laying.
which solution whose POH is 12
A)[H3O+] = 1×10−2 M
B)[OH−] = 1×10−2 M
C)[-OH] = 1×10−12 M
D)[H3O+] = 1×10−12 M
Answer:
d
Explanation:
H3O =1×10_12=12 ooh is 12
Which of the following best describes a neutralization reaction?
A. Acid + base =
[tex] {h}^{2} 0 + {h}^{3} {0}^{ + } [/tex]
B. Acid + base H+ + OH-
C. Acid + base salt + water
D. Acid + base metal + nonmetal
Answer: c
Explanation: just took the test and got it right
The _____ and the rate of heat generation in a heat conduction problem represent the average properties of the element.
Answer:
temperature is the answer
5. A sample of carbon dioxide (CO2) has a mass of 52.0 g.
a. How many carbon atoms are present?
Answer:
52.0 gof CO2 contains 7.1 *10^23 molecules
1 molecule of CO2 has a mass of 7.3*10^-23 grams
Explanation:
Step 1: Data given
Mass of CO2 = 52.0 grams
Molar mass of CO2 = 44.01 g/mol
Number of Avogadro = 6.022 * 10^23 / mol
Step 2: Calculate moles of CO2
Moles CO2 = Mass CO2 / molar mass CO2
Moles CO2 = 52.0 grams / 44.01 g/mol
Moles CO2 = 1.18 moles
Step 3: Calculate molecules in 1.18 moles CO2
Number of molecules = 1.18 moles * 6.022*10^23 = 7.1 *10^23 molecules
1 molecule of CO2
Number of moles = 1 / 6.022*10^23
Number of moles = 1.66 *10^-24
Mass CO2 = 1.66*10^-24 moles * 44.01 g/mol
Mass CO2 = 7.3*10^-23 grams
When the light energy from sunlight hits matter, _________.
A. heat energy is formed
B. nothing happens
C. potential energy is formed
Answer:
When the light energy from sunlight hits matter, heat energy is formed
Answer:
A
Explanation:
when light energy hit matter heat energy formed
6. How could a dichotomous be helpful to you if you were lost in the wilderness?
Answer:
Brainliest pls
Explanation:
Dichotomous keys are exceptionally valuable since they permit non-master clients to distinguish living beings by guiding them to check the known, significant creatures out
2. Circle all of the following that change with the temperature of a reaction.
3. Draw an arrow on this graph of the Arrhenius equation that shows where you would find ln A (log of the frequency factor).
4. If the slope of the line in the graph above is -350 K, what is the value of Ea (in J/mol)?
The activation energy (Ea) for the reaction is calculated from the slope as is - 1.16kJ.
What the Arrhenius equation?The Arrhenius equation relates the rate constant of a reaction to the temperature of the reaction. It is an offshoot of the collision theory. We must note that the collision factor A is the y intercept of the graph.
Given that T = -350 K
R = 8.314 J/K.mol
Ea = ??
-350 = Ea/8.314
Ea = -350 × 8.314
Ea = - 1.16kJ
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why organic chemistry is based on carbon?
Answer:
Life is based on carbon; organic chemistry studies compounds in which carbon is a central element. The properties of carbon make it the backbone of the organic molecules which form living matter. Carbon is a such a versatile element because it can form four covalent bonds.
Explanation:
brainliest pls
Organic chemistry is based on carbon because the property of carbon catenation is tetravalent due to which most of the organic compounds are carbon compounds.
Why is organic chemistry called carbon chemistry?Organic chemistry is the branch of chemistry that studies carbonic compounds or organic compounds, which are those formed by carbon atoms. In short, organic chemistry is the study of carbon compounds.
The answer is based on the way carbon combines with other chemical elements to form molecules. For example, hydrogen atoms only bond to one atom, oxygen to two atoms. Carbon is a particularly versatile chemical element, as it can bond with four atoms at once.
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Which of the following is an indication of a chemical reaction?
freezing
melting
release of heat
all of the above
Answer:
All of the above
Explanation:
Their all chemical change
How are different elements distinguishable from one another? (Check all that apply.)
Each has a unique chemical symbol.
Each is made of the same substance.
Each has a unique atomic number.
Each has a characteristic placement within the Periodic Table.
How many formula units are in 366 grams of XPO4? X is a fictitious element. The Molar Mass of X = 26.98 g/mol. Use the periodic table for any other elements listed.
Question options:
a) 2.33 E 24 formula units
b) 7.41 E -24 formula units
c) 1.81 E 24 formula units
d) 3.40 E 24 formula units
1.81 E 24 formula units are in 366 grams of XPO4.
HOW TO CALCULATE FORMULA UNITS?The formula units of a compound can be calculated using the following expression:
First, we calculate the molar mass of XPO4 as follows:
XPO4 = 26.98 + 31 + 16(4) = 121.98g/mol
moles = 366g ÷ 121.98g/mol
moles = 3mol
Next, we multiply the number of moles by 6.02 × 10²³
formula units = 6.02 × 10²³ × 3 = 1.81 × 10²⁴
Therefore, 1.81 E 24 formula units are in 366 grams of XPO4.
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_____ resources are resources that cannot be replenished within a lifetime.
Question 1 options:
Nonrenewable
Renewable
Living
Endangered
Nonrenewable natural resources are resources that cannot be replenished within a lifetime.
Question 8 Calculate the volume at RTP occupied by: a) 0.16 g of oxygen
Answer:
0.12 dm³ or 120 cm³
Explanation:
Hi there!
so first step find the number of moles
number of moles = mass ÷ Ar ( since o is an element and when it is alone, it is a diatomic molecule {O2} )
number of moles = mass ÷ Ar
number of moles = 0.16 ÷ ( 16 × 2 )
= 0.16 ÷ 32
= 5 × 10 ( power -3)
1 mol of O2 = 24 dm³ or 24 000 cm³
5 × 10 ( power -3) of O2 = (5 × 10 ( power -3)) × 24
= 0.12 dm³
or
= (5 × 10 ( power -3)) × 24 000
= 120 cm³
F. How many moles of gas would be present in a gas trapped within a 0.300 L vessel at 15.0°C at
a pressure of 157.6 kPa?
This problem is providing the volume, temperature and pressure of a gas and asks for the number of moles at such conditions, which turns out to be 0.0160 mol.
Ideal gasesIn chemistry, we study ideal gases, which are assumed to be perfectly spherical and with no relevant neither attractions nor repulsions among molecules, with the widely-known ideal gas equation relating volume, temperature, pressure and moles as follows:
[tex]PV=nRT[/tex]
Thus, knowing it is in a 0.300-L vessel at 15.0 °C and 157.6 kPa, one can solve for n in the previous equation to get:
[tex]n=\frac{PV}{RT}[/tex]
And plug in by making sure the pressure is in atmospheres and the temperature in kelvins:
[tex]n=\frac{157.6kPa*\frac{1atm}{101.325kPa}*0.300L}{(0.08206\frac{atm*L}{mol*K})*(15.0+273.15)K}\\\\n=0.0160mol[/tex]
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If 100 grams of water can produce 11 grams of hydrogen gas, how many kilograms of hydrogen gas can be produced in the electrolysis of 500 kg of water?
By using the given ratio, we will find that, out of 500kg of water, we could produce 55kg of hydrogen gas.
How to find the mass of hydrogen that we can produc with 500kg of water?
We know that out of 100 grams of water, we can produce 11 grams of hydrogen gas.
Taking the quotient we get the ratio:
(11g/100g) = 0.11
We could conclude that for any mass of water we can produce 0.11 times that mass of hydrogen gas.
This means that if we have 500kg of water, then we can produce:
0.11*500kg = 55kg of hydrogen gas.
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What is [H+] in a solution with a pH = 1.82?
[tex]\\ \tt\Rrightarrow pH=-log[H^+][/tex]
[tex]\\ \tt\Rrightarrow 1.82=-log[H^+][/tex]
[tex]\\ \tt\Rrightarrow log[H^+]=-1.82[/tex]
[tex]\\ \tt\Rrightarrow [H^+]=10^{-1.82}[/tex]
[tex]\\ \tt\Rrightarrow [H^+]=0.015M[/tex]
The compound nickel(II) sulfate is a strong electrolyte. Write the reaction when solid nickel(II) sulfate is put into water.
We can confirm that when placed into water, the compound will break up into ions almost completely.
Why does this compound dissolve this way?This has to do with the fact that strong electrolytes tend to become completely ionized when placed in water. This means that the compound dissolves completely and breaks up into ions if enough water is present.
Therefore, we can confirm that the compound will break up into ions almost completely when placed into water.
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Using correct significant figures, calculate the length of one side of a cube made of gold, if the mass of the cube is 4.05 g and the density of gold is 19.32 g/cm3
Answer:
Explanation:
density = 19.32
Mass = 4.05 g
V = ?
Formula
Density = mass / volume or
volume = mass / density.
Solution
volume = mass / volume
volume = 4.05 / 19.32
Volume = 2.10
The solid cube has a side length of ∛V which reads as the cube root of volume.
Side Length = ∛2.10 = 0.594 cm
if 10 lbs. Of sugar yields 4.2 lbs of carbon when burned completely, how carbon would 42 pounds of sugar yield?
27. I think that's the answer
What is the gram molecular weight (GMW) of CuCl2?
The molar mass of CuCl2 is 134.452 g/mol. Each element's molar mass can be found in its designated box on the periodic table.
6. If 2.6g of Lif dissolves and warms 25mL of water by 4.7°C, what
is the enthalpy of solution in kJ/mol? (Specific heat capacity of
water = 4.186J/mL/K)
Answer:
The idea here is that you can use the heat absorbed by the solution to find the heat given off by the dissolution of the salt.
More specifically, you can assume that
Δ
H
diss
=
−
q
solution
The minus sign is used here because heat lost carries a negative sign.
To find the heat absorbed by the solution, you can use the equation
q
=
m
⋅
c
⋅
Δ
T
−−−−−−−−−−−−−
Here
q
is the heat gained by the water
m
is the mass of the water
c
is the specific heat of water
Δ
T
is the change in temperature, defined as the difference between the final temperature and the initial temperature of the sample
As the problem suggests, you can approximate the mass and the specific heat of the solution to be equal to those of the pure water sample.
The temperature increases by
0.121
∘
C
, so you know that
Δ
T
=
0.121
∘
C
→
positive because the final temperature is higher than the initial temperature
Plug in your values to find
q
=
125
g
⋅
4.18 J
g
−
1
∘
C
−
1
⋅
0.121
∘
C
q
=
63.22 J
So, you know that the solution absorbed
63.22 J
, which implies that the dissolution of the salt gave off
63.22 J
. In other words, you have
Δ
H
diss
=
−
63.22 J
Convert the mass of sodium hydroxide to moles by using the compound's molar mass
2.4
⋅
10
−
4
g
⋅
1 mole NaOH
39.997
g
=
6.00
⋅
10
−
6
moles NaOH
You know that the enthalpy of dissolution when
6.00
⋅
10
−
6
moles of sodium hydroxide are dissolved in water, so use this info to find the enthalpy of dissolution when
1
mole of the salt dissolves
1
mole NaOH
⋅
−
63.22 J
6.00
⋅
10
−
6
moles NaOH
=
−
1.054
⋅
10
7
J
Finally, convert this to kilojoules
1.054
⋅
10
7
J
⋅
1 kJ
10
3
J
=
1.054
⋅
10
4
kJ
Therefore, you can say that the enthalpy of dissolution, or molar enthalpy of dissolution, for sodium hydroxide is
Δ
H
diss
=
−
1.1
⋅
10
4
.
kJ mol
−
1
−−−−−−−−−−−−−−−−−−−−−−−−−−−
The answer is rounded to two sig figs, the number fo sig figs you have for the mass of sodium hydroxide.
SIDE NOTE The accepted value for the enthalpy of dissolution of sodium hydroxide in water at
25
∘
C
is
Δ
H
diss
=
−
44.51 kJ
Explanation:
i hope its right
How do gas molecules move?
a. in an orderly fashion
c. in constant and random motion
b. taking steps and jumping
d. in circular motion
GAS :P
Draa
Answer:
in constant and random motion
Explanation:
As the gas molecules collide with the walls of a container, the molecules impart momentum to the walls, producing a force that can be measured. ... The molecules are in constant random motion, and there is an energy (mass x square of the velocity) associated with that motion.
Hydrazine (N 2 H 4 )) a rocket fuel reacts with oxygen to form nitrogen gas and water vapor . The reaction is represented with the equation: N 2 H 4 (l)+O 2 (g)—> N 2 (g)+2H 2O(g)
How many grams are needed to produce 96.0g water?
A.) 32.0g N2H4
B.) 48.0g N2H4
C.) 85.4g N2H4
D.) 192.2g N2H4
The mass of hydrazine (N₂H₄) required to produce 96 g of water (H₂O) is 85.4 g (Option C)
Balanced equationN₂H₄ + O₂ —> N₂ + 2H₂O
Molar mass of N₂H₄ = (2×14) + (4×1) = 32 g/mol
Mass of N₂H₄ from the balanced equation = 1 × 32 = 32 g
Molar mass of H₂O = (2×1) + 16 = 18 g/mol
Mass of H₂O from the balanced equation = 2 × 18 = 36 g
SUMMARY
From the balanced equation above,
36 g of H₂O were produced by 32 g of N₂H₄
How to determine the mass of N₂H₄From the balanced equation above,
36 g of H₂O were produced by 32 g of N₂H₄
Therefore,
96 g of H₂O will be produced by = (96 × 32) / 36 = 85.4 g of N₂H₄
Thus, 85.4 g of N₂H₄ is needed for the reaction
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How many molecules of oxygen are there in a 240.g sample of Oz gas? *
1 point
8.98 x 1023 molecules
1.26 x 1025 molecules
4.52 x 1024 molecules
1.26 x 1024 molecules
6.32 x 1024 molecules
Answer:
the second one
Explanation:
because all of them are under
please help!! i need it right now
this is your correct answer mark me brainest
What is the key factor in defining a reaction as an oxidation-reduction reaction?
transfer of electrons between atoms
oxygen as one of the reactants
making and breaking ionic bonds
precipitation of solid from the reaction solution
Answer:
Transfer of electrons between atoms
Explanation:
Just because it has the prefix "oxi" it doesn't necessarily mean that oxygen exists as a reactant.
Making and breaking ionic compounds happen right before or after redox reactions after the atoms or ions are modified into one another.
precipitation occurs during the redox rxns involved in electrolysis & daniel cells. but it is not a key factor.
An ecosystem is made up of the interaction of all organisms in an area with all nonliving things. Organisms are living things like animals, plants, and microbes. Nonliving things include water, dirt, rocks and the sun. The living things are called biotic components and the nonliving things are called abiotic components.
There are a few different types of biotic components. Producers are living things that use a process called photosynthesis, which turns the sun's energy, water and carbon dioxide into fuel. Producers form the molecules that are the basis for all life on Earth, including plants, algae and some bacteria.
Consumers are animals that get their energy from eating other plants and animals. Decomposers are organisms that break down animal and plant material to make nutrients available. Examples of decomposers are bacteria, fungi and insects.
Abiotic components include temperature, sunlight, water, wind and minerals.
.
Write a short paragraph that explains the central idea of the article. Use at least two details from the article to support your response.
Answer:
All species in a given region interact with all nonliving objects to form an ecosystem. Animals, plants, and bacteria are examples of living organisms. Water, soil, rocks, and the sun are all nonliving objects. Biotic components are living organisms, while abiotic components are nonliving organisms.
Biotic components come in a variety of shapes and sizes. Producers are living entities that convert the sun's energy, water, and carbon dioxide into fuel through a process called photosynthesis. Producers create the compounds that underpin all life on Earth, including plants, algae, and bacteria.
I rephrased this...
Consider the following reaction.
2NO2(g)⇌N2O4(g)
When the system is at equilibrium, it contains NO2 at a pressure of 0.878 atm , and N2O4 at a pressure of 0.0771 atm . The volume of the container is then reduced to half its original volume. What is the pressure of each gas after equilibrium is reestablished?
The pressure of NO2 and N2O4 would be 1.756 atm and 0.1542 atm respectively.
Gas lawsAccording to Boyle's law, the pressure of a gas is inversely proportional to its volume at a constant temperature.
Mathematically: P1V1=P2V2
When the volume of a gas is halved at a constant temperature, the pressure is doubled. If it is the volume is doubled, the pressure would be halved.
In this case, the volume of the container is halved. Meaning that the pressure of each of the gas would be doubled by the time the equilibrium is reestablished.
Thus, NO2 would double from 0.878 atm to 1.756 atm while N2O4 will double from 0.0771 atm to 0.1542 atm
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What human activities may be causing CCD
Explanation:
Varroa mites, viruses, and European foulbrood
Answer:
CCD is likely to result from a combination of pathogens, such as Varroa mites, viruses and European foulbrood: issues related to nutrition, such as undernourished or malnourishment
need it for resources(duh)
Answer: Trail 2
Explanation: Because it has a pressure of 1 atm
