How much heat is needed to raise the temperature of 20.0g of H2O by 10.6oC?
Answer:
ΔH = 8.87 x 10₅
Explanation:
q = mcΔT = 20g x 1.00 cal/g°C x 10.6°C = 212 cals x 4.184 j/cals = 8.87 x 10⁵ joules
1. The diagram above shows the repeating groups of atoms that make up two samples. Will the
properties of the two samples likely be the same or different? (Examples of properties are smell,
color, and the temperature at which a substance melts.)
Answer:
Will likely be the same
Explanation:
We can see in both pictures there is a black molecule and a red molecule. However, we also have a purple molecule in one image and a yellow in the other. It would LIKELY be the same because we have more of the same molecules then more different molecules. Hope this helps
The process of cell division in which the resulting cells have half the chromosomes number of the parent cell.
Question 1 options:
ossmosis
mitosis
meiosis
diffusion
Answer:
Meiosis
Explanation:
This is The process of cell division in which the resulting cells have half the chromosomes number of the parent cell.
please help me lol
How many grams of magnesium sulfate (MgSO4) are dissolved in 0.965 L of a 0.0575 M solution? Molar Mass Mg: 24.30 g/mol Molar Mass S: 32.06 g/mol Molar Mass O: 16.00 g/mol
Answer:
in 4 liters of solution
MgSO4) are dissolved in 0.965 L of a 0.0575 M solution? Molar Mass Mg: 24.30 g/mol Molar Mass S: 32.06 g/mol Molar Mass O: 16.00 g/
Answer:
6.68
Explanation:
i did it and got it right
DNA
What organism is often used to study mutations
Answer:
Hartwell's yeast
Explanation: A model organism for studying somatic mutations and cancer."
Diamonds have a density of 3.26 g/mL. What would be the mass of a diamond with a volume
of 0.350 mL?
use ideas about particles and energy transfer to explain why sweat cools you down
Answer:
So the paws in your body like ot opens up and when the wind blows on the sweat it basically cools you down
Explanation:
I hope it is what you were looking for.
Balance this equation. Pb(NO3)2(aq)+NaCl(aq) -> NaNO3(aq)+PbCl2(s)
Answer:
Pb(NO3)2(aq) + 2NaCl(aq) -> 2NaNO3(aq)+PbCl2(s)
Explanation:
Pb(NO3)2(aq)+NaCl(aq) -> NaNO3(aq)+PbCl2(s)
This is how it starts out.
Left:
2 NO3s1 Pb1 Na1 ClRight
1 Na1 NO31 Pb2 ClSo the place to start with this equation is to bring the Cls up to 2
Pb(NO3)2(aq)+2NaCl(aq) -> NaNO3(aq)+PbCl2(s)
But the Nas are now out of kilter.
Pb(NO3)2(aq)+ 2NaCl(aq) -> NaNO3(aq)+PbCl2(s)
Now the right has a problem. There's only 1 Na
Pb(NO3)2(aq) + 2 NaCl(aq) -> 2NaNO3(aq)+PbCl2(s)
Check it out. It looks like we are done.
Help! Please:(
Given the following chemical equation, how many grams of water are created when 50.0 grams of oxygen react with excess hydrogen ?
2H2 + O2 - -> 2H20
Answer:
About 56.3 grams of H2O
Explanation:
What are some potential traits that are needed to become a super athlete?
Answer: Confidence, strength, potential
Explanation:
[tex] \huge \boxed{ \fcolorbox{black}{pink}{Answer}}[/tex]
20 Distinguishing Personality Traits of High-Performing Athletes
1. Self Confidence. “Self-Confidence” isn't just a phrase for cheesy motivational posters. ...
2. Strong Sense of Motivation. It takes more than a shiny medal or hefty check to motivate the world's best athletes. ...
3. Inner Desire to Succeed. ...
4. Natural Goal Setter. ...
5. Self-Discipline. ...
6. Optimism. ...
7. Sense of Belonging. ...
8. Natural Leader.
What does these mean (thermal energy, convection, radiation and coundution)
Answer:
Thermal Energy: It refers to some distinct physical concepts, such as the internal energy of a system or heat or sensible heat. And these mode of transfer of heat include, convection, conduction and radiation which I have explained below.
Convection: This is a mode of transfer of heat in which bulk movement of molecules within fluids takes place, as these molecules move the heat obtained by each of the molecules will reach the new location.
Radiation: Radiation is the emission or transmission of energy in the form of waves or particles through space or through a material medium
Conduction: Conduction is the transfer of internal energy by microscopic collisions of particles and the movement of electrons within an object.
Which of the following could not be an empirical formula? a CaO b CO2 c KCl d C6H12
Answer:
D. C6H12
Explanation:
An empirical formula means that the chemical formula of a compound has to be in it's simplest whole number form. In this case, D is not an empirical formula because it is able to be simplified to C3H6. All the other answers are simplified to the simplest whole number ratio. Think of it as a fraction being in simplest form.
Answer:
b CO2 is not an empirical formula.
To which of the three main chemical classes does Mercury (Hg) belong?
a) It's not an element in the periodic table
b) Metalloids
c) Non-metals
d) Metals
Answer:
Metals
Explanation:
It is a transition metal
The periodic table has a lot of different properties in how it is presented, one of these, is that the elements are separated in blocks by their properties.
From its position in the table, we can see that the correct option is d) metals.
The general way of knowing if an element is a metal or not, is to look if it is the D block in the periodic table.
This block contains all the transition metals (not all the metals) but every element in it is a metal. If we look for the mercury, we can see that it is in block D, just next to gold (Au).
Just from this, we can conclude that mercury is a metal, so the correct option is d.
If you want to learn more, you can read:
https://brainly.com/question/11155928
Which describes the molecule below?
O A. A lipid with three saturated fatty acids
• B. A lipid with two unsaturated fatty acids and one saturated fatty
acid
• C. A lipid with three unsaturated fatty acids
• D. A lipid with two saturated fatty acids and one unsaturated fatty
acid
What type of mixture is Mayonnaise?
A. Homogeneous
B. Heterogeneous
C. Compound
D. Element
an atom is the smallest unit of an element that retains the ___ of that element
an atom is the smallest unit of a pure substance or element that can exist and still retain the properties of the original substance or element
When does magnetic force push objects apart?
A. when like poles of two magnets are facing each other
B. when opposite poles of two magnets are facing each other
C. when the objects are made of wood
D. never
Answer:
the answer is this hope it helps
What are the number of atoms in each Chemical Formula
the correct formula for the diagram is
1. 2KO
2. K2O
3. K2O
4. KOK2
Answer:
The diagram provided shows K2O, or potassium oxide.
Explanation:
Ok... so, there are two "K2O" options, so I would just choose either and hope for the best. I don't know, maybe it's a mistake...
Answer:
The answer is K2O or dipotassium Monoxide
When magnesium is added to hydrochloric acid, a gas is formed. Explain what happens in the reaction, how the gas is collected and how it could be tested to prove what it is.
Answer:
Explained below.
Explanation:
Formula when magnesium reacts with hydrochloric acid is given by;
Mg(s) + 2HCl(aq) = MgCl2(aq) + H2(g)
So, from the equation, we can see that the gas formed is hydrogen.
This hydrogen gas is collected by a method known as water displacement.
This gas can be tested for by holding a burning splint near to the top of the test container. The resulting effect should be a high pitched pop sound because the hydrogen gas will react with the oxygen gas in the air to result in a small explosion.
what is the noble gas configuration of V+3
Answer:
Ar 3d3 4s2
Explanation:
pls help asap!!!!
3 gasses are mixed together (N2, O2, and He). The gauge of the N2 states a pressure of 1.23 atm. The gauge on the O2 tank shows 2.3 atm. The Helium gauge is broken. When the gasses are mixed, the total pressure of the tank is 6.50 atm. What is the pressure of the He?
a) 3.47 atm
b) 2.97 atm
c) 0.435 atm
d) 10.03 atm
Answer: The pressure of the He is 2.97 atm
Explanation:
According to Dalton's law, the total pressure is the sum of individual pressures.
[tex]p_{total}=p_{N_2}+p_{O_2}+p_{He}.[/tex]
Given : [tex]p_{total}[/tex] =total pressure of gases = 6.50 atm
[tex]p_{N_2}[/tex] = partial pressure of Nitrogen = 1.23 atm
[tex]p_{O_2}[/tex] = partial pressure of oxygen = 2.3 atm
[tex]p_{He}[/tex] = partial pressure of Helium = ?
putting in the values we get:
[tex]6.50atm=1.23atm+2.3atm+p_{He}[/tex]
[tex]p_{He}=2.97atm[/tex]
The pressure of the He is 2.97 atm
A baker has two identical cakes except that one cake is hot, and the other cake is room temperature. He places both cakes on an ice-cold
plate. What happens? (Mark the one best answer.)
Both cakes transfer energy to the plate.
The plate transfers energy to the room temperature cake.
Neither cake transfers energy to the plate
Only the hot cake transfers energy to the plate.
Answer:
the plate gets warmer and the cake gets colder
Explanation:
my brain
Helllllp meh pleaseeeeeee
Answer:
c (clay)
Explanation:
someone plz help me.
Answer:
The answer is 2.
Explanation:
It is the only one that has a chemical change.
Hope this helped you :)
If so pls give brainliest.
Given the balanced equation below, how many moles of chromium are
produced? 2Cr2O3 + 3S1 --> 4Cr + SIO3
O A. 1 mole
B. 2 moles
O C. 3 moles
O D. 4 moles
5) Calculate the volume, in liters, of 3.24 x 1022 molecules
CI2
Answer: 1.12 Liters
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given molecules}}{\text {avogadro's number}}=\frac{3.24\times 10^{22}}{6.023\times 10^{23}}=0.05moles[/tex]
1 mol of [tex]Cl_2[/tex] occupy = 22.4 L
Thus 0.05 mol of [tex]Cl_2[/tex] will occupy = [tex]\frac{22.4}{1}\times 0.05=1.12 L[/tex]
A what is matter that is always composed of the same combination of atoms
Answer:
A substance
Explanation:
What is the volume of 3.5 moles of chlorine gas at standard temperature and pressure (STP)? (3 points)
6.4 L
22 L
32L
78 L
Answer:
78
Explanation:
The molar mass of two equally sized samples of unknown gaseous compounds is shown in the table. Molar Mass Comparison Gas Molar Mass A 17 g/mol B 36.5 g/mol Which statement describes the density and diffusion of both gases at STP? Gas A has a higher density and diffuses faster than Gas B. Gas A has a higher density and diffuses slower than Gas B. Gas A has a lower density and diffuses faster than Gas B Gas A has a lower density and diffuses slower than Gas B.
Answer:
Effusion is the process of a gas being poured out through a hole diametrically smaller than the structural exit of the container.
A lighter gas effuses faster than a heavier gas.
Thus gas A has a lower density and effuses slower than Gas B.
Explanation:
The gas with a lower molar mass will have a lower density and diffuses at a slower rate. Thus gas A has a lower density than gas B and diffuses slower than gas B.
Three points should be noted here;
The density of any substance is related to the molar mass.[tex]D=M/V[/tex], where [tex]D[/tex] is the density, [tex]M[/tex] is the mass and [tex]V[/tex] is the volume of the substance.The density of the gas is directly proportional to the molar mass of the gas.Hence the gas A has lower density and the gas B has higher density as the molar mass of A is [tex]17 g/mol[/tex] and of B is [tex]36.5 g/mol[/tex].
About Diffusion please note the below points;
Diffusion is the process of movement of a substance from the area of higher concentration to the area of lower concentration.The gas with a smaller mass will diffuse slower in rate than the gas with a higher mass.Hence the gas A diffuses slower in rate than gas B.
Thus the correct answer is "Gas A has a lower density and diffuses slower than Gas B".
Learn more about the density of gas here: https://brainly.in/questions/16376906