How much heat is necessary to change 10.0g of water from 20 degrees celsius to 75 degrees celsius
Answer:
6
Explanation:
How could we separate the baking soda from the after after it had already been mixed in? helppp!!!
Answer:
i thing by filtering
Explanation:
Explain why in this crossing all of the hedgehog offspring are brown even though they all carry the white gene?
Why do chemical changes happen
Answer:
Reactions occur when two or more molecules interact and the molecules change. ... Bonds between atoms are broken and created to form new molecules. That's it.
Explanation:
I will give you a lot of points help me ASAP please I am begging you
Answer:
hope this helps
Explanation:
If the density is 0.9g/cm3 and the volume is 1.5cm3 ? What is the Mass?
Answer:
1.35g
Explanation:
times the density and volume together to get the mass
0.9 x 1.5 = 1.35g
A chemical reaction yields 1 mole of lithium hydroxide (LiOH). How many grams of
lithium hydroxide are present?
3 g
48 g
728
24 g
Mass of LiOH= 23.95 grams ≈ 24 g
Further explanationGiven
1 mole of lithium hydroxide (LiOH)
Required
Mass of LiOH
Solution
The mole is the number of particles contained in a substance
1 mol = 6.02.10²³
Moles can also be determined from the amount of substance mass and its molar mass
n = mass : molar mass
Input the value :
mass = n x molar mass
mass = 1 mole x 23,95 g/mol
mass = 23.95 grams ≈ 24 g
The mass of 1 mole LiOH has been 24 g. Thus, option D is correct.
The mass of a compound present in a mole of sample has been equivalent to the molar mass of the compound. The molar mass of the compound has been the sum of the constituent in a formula unit.
The molar mass of lithium hydroxide (mwt) has been given as:
[tex]mwt=m_L_i\;+\;m_O\;+\;m_H[/tex]
Where, the mass of Li is [tex]m_L_i=6.941\;\rm g[/tex]
The mass of oxygen is [tex]m_O=16\;\rm g[/tex]
The mass of hydrogen is [tex]m_H=1\;\rm g[/tex]
Substituting the values for molar mass (mwt) of LiOH:
[tex]mwt=6.941\;+\;16\;+\;1\;\text g\\mwt=23.941\;\text g\\mwt=24\;\text g[/tex]
The molar mass of LiOH has been 24 g.
The molar mass has been equivalent to the mass of 1 mole of sample. Thus, the mass of 1 mole LiOH has been 24 g. Thus, option D is correct.
For more information about mass of mole, refer to the link:
https://brainly.com/question/1370888
The cell in the diagram to the right is going through a process that indicates it is a?
A-nerve cell
B-brain cell
C-blood cell
D-sex cell
NEED NOW!!
Please help me out with this assignment
Answer:
1. 7 meters
2. gullet
4. Not sure about this
6. strong
7. digestive
8. starch
12. Not sure about this either
14. Water
15. Jejunum
19. teeth
Hope this helps!
The pictures below show samples of different substances.
The mass and volume of each sample differ from the mass and volume of the other samples. Is it possible for each sample to contain 1 mol of each substance?
A. No, because they have different masses.
B. No, because they have different volumes.
C. Yes, if each sample contains 6.02 x 10^23 atoms.
D. Yes, if each sample contains 2 amu.
Answer:
C. Yes, if each sample contains 6.02 x 10²³ atoms.
Explanation:
It is possible for each sample to contain 1 mole of each sample if and only if each of the sample if made up of 6.02 x 10²³ atoms.
6.02 x 10²³ atoms is the Avogadro's number. This number is equivalent to a mole of a substance.
If the amount of matter in the given substance is at least one mole, it is possible that they are made up of one mole each of each substance. If they contain lesser amount of atoms, then it is not up to one mole of substance. But if it is greater, then, we can have even more than one mole of substance.A mole is simply a unit of measurement and it is equivalent to 6.02 x 10²³ atoms.
Answer:
C
Explanation:
i just took the test
:)
WHAT IS THE TOTAL NUMBER OF ATOMS IN BOTH OF THESE
COMPOUNDS?
Can someone help me answer this ASAP !!!
Answer: Chlorine I think
Explanation:
Chlorine is added to the water to kill germs. When it is added to a swimming pool, it forms a weak acid called hypochlorous acid that kills bacteria like salmonella and E.
Answer: Chlorine!
Explanation:
When it is added to a swimming pool, it forms a weak acid called hypochlorous acid that kills bacteria like salmonella and E. coli, as well as germs that cause viruses such as diarrhea and swimmer's ear.
To have a system you need more than one magnet .
true or false
Answer:
True
Explanation:
Answer: true
Explanation:
For 30 points pls help me with this question
Answer:
a put a as you answer you rock do not give up on your dreams
i am not sure i am thinking A and C
Answer:
I think so too
Explanation:
In negative adsorption the concentration of the solution is
Answer:
This is called negative adsorption. Hence if the concentration of the adsorbate is less on the surface of the adsorbent than in the bulk, it is known as negative adsorption.
Explanation:
Hope this helps
9
A 75 gram sample of water is initially at 30 degrees Celsius. What would it's temperature be if
it absorbed 2000 J of heat?
Answer:
T2 = 36.38°C
Explanation:
Given data:
Mass of water = 75 g
Initial temperature = 30 °C
Final temperature = ?
Heat absorbed = 2000 J
Solution:
Specific heat capacity of water is 4.18 J/g.°C
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = Final temperature - initial temperature
2000 J = 75 g×4.18 J/g.°C × T2- T1
2000 J = 313.5 J/°C × T2- T1
2000 J = 313.5 J/°C × T2 - 30 °C
2000 J / 313.5 J/°C = T2 - 30 °C
6.38 °C = T2 - 30 °C
T2 = 6.38 °C + 30°C
T2 = 36.38°C
Place the following metals in order of most reactive to least:
Aluminium
Calcium
Copper
Iron
Magnesium
Sodium
Zinc
Answer:
Sodium
Calcium
Magnesium
Aluminium
Zinc
Iron
Copper
Explanation:
Please help fast! I will give brainliest!
Answer:(c)
Explanation:
Do you think that it is necessary and/or important to take a multivitamin everyday to maintain optimal health? What might help you answer this question? What types of things might influence your decision to take a multivitamin every day?
What's ur opinion with explanation???????!!!!!!!!!!
hello, please can you solve my question:
an atom contains 22 protons and 26 neutrons. What is it's mass number?
I will mark brainliest
_NaHCO(s) --> _CO2+_NaCO(s)+_H2O
balance the equation
The balanced equation :
2NaHCO₃⇒CO₂ + Na₂CO₃+H₂O
Further explanationGiven
Reaction
NaHCO(s) --> _CO2+_NaCO(s)+_H2O
Required
The balanced equation
Solution
Maybe the equation should be like this :
NaHCO₃⇒CO₂ + Na₂CO₃+H₂O
Give a coefficient
NaHCO₃⇒aCO₂ + bNa₂CO₃+cH₂O
Make an equation
Na, left=1, right=2b⇒2b=1⇒b=1/2
H, left=1, right=2c⇒2c=1⇒c=1/2
C, left=1, right=a+b⇒a+b=1⇒a+1/2=1⇒a=1/2
The equation becomes :
NaHCO₃⇒1/2CO₂ +1/2Na₂CO₃+1/2H₂O x2
2NaHCO₃⇒CO₂ + Na₂CO₃+H₂O
please help me i really am struggling
Answer:
It is visible light
Explanation:
If the mass of an object is 15kg and the volume of an object is 15ml, what is its density?
0 225kg/ml
Okg/ml
1kg/ml
30kg/ml
Answer:
1kg/ml
Explanation:
The _energy of the baseball is the sum of the kinetic energy and _energy of the particles that make up the baseball
Answer:
Mechanical energy
Kinetic energy
Explanation:
The mechanical energy is the sum of the kinetic and potential energy of the particles that make up the baseball.
Mechanical energy is made up of kinetic energy and potential energy. When the baseball is in motion, the particles make use of the kinetic energy, also known as motion energy and when the ball is not in motion the particles make use of the potential energy, also known as stored energy.
If the theoretical yield of a reaction was calculated to be 42.6 grams and when the
experiment was conducted the amount produced was 20.7 grams, the what is the percent
yield of the experiment?
Answer:
48.59%
Explanation:
theoretical yield = 42.6g
actual yield = 20.7g
% yield = 20.7/42.6 x 100 = 48.59% (2 d.p.)
what is the theoretical yield (in mols) of magnesium when 1.1 x 102 mols of lithium reacts with excess magnesium chloride.
Explanation:
Use the molecular formula to find the molar mass; to obtain the number of moles, divide the mass of compound by the molar mass of the compound expressed in grams.
PLEASE HELP I WILL MARK AS BRAINLESS 12+ POINTS!!
Which of the following reasons BEST explains why thunderstorms are likely to form on a hot day?
A warm, humid air rises quickly and then condenses into rain clouds.
B) as air rises, it loses temperature and causes rain.
C the air is usually calm and allows the clouds to form
D the air drops quickly and forms low level cloud layers.
Answer:
A
Explanation:
The high humidity, in conjunction with warm temperatures, creates massive amounts of warm, moist air rising into the atmosphere, where it can easily form a thunderstorm. As the process of evaporation and condensation occurs, these droplets collide with other moisture that is condensing as it rises.
Explain the effect of pressure on the following chemical equation :
[tex]CaCO_3 = CaO + CO_2[/tex]
2. Explain the effect of concentration in the following equation :
[tex]3Fe \: +4H_2O= Fe_3 \: O_4 + 4H_2[/tex]
Answer:
Explanation:
One
Pressure will favor the side with the least number of mols if it the larger number of moles counts only the gases. (Le Chetalier's Principle). In this case both CaCO3 and CaO are not soluble in water. The only gas is CO2. Since it represents the most number of mols the reactant is favored.
More or Less are very troublesome words in beginning science. Make sure you understand their meaning for this question. The more pressure applied, the more the reactants will be favored and the equation shifts left.
Two
Fe and Fe3O4 are both solids. It depends on the form that water takes. Looking it up, it is shown to be in a gas form. That means if you increase the pressure, nothing will happen. That is not your question, but you should note it.
The answer to your question is you increase the concentration of Fe or H2O, the equilibrium will shift right.
If you add more Fe3O4 or hydrogen it will shift left.
Chemists say that if you alter the equilibrium the equation will shift in the opposite direction to compensate for the action you have taken.
What is the movement of water across a membrane from an area of high concentration to an area of low concentration 
Answer:
Osmosis
Explanation:
The movement of water across a membrane from an area of high concentration to that of low concentration is defined as osmosis.
Osmosis is very important in all living cells because it is one of key mechanism for transporting materials between and within cells.
The membrane most times is selectively permeable in nature and it allows for a regulated movement of materials from one region to another.