how much heat is needed to warm 250g of water from 22°C to 98°C ?
Answer:
79'420J
Explanation:
We know mass 250g and
∆T=98°C -22°C
=76°C
The specific heat capacity for water is 4,18Zj/g°C
THEREFORE
∆H=250g•14,8j/g°C •76°C
=79'420J
what kind of chemical reaction is this?
What is the limiting reactant if 10 moles of NH 3 react with 30.0 moles of NO ?
Answer:
NO is the limiting reactant.
Explanation:
4NH3 + 6NO --> 5N2 + 6H2O
Molar ration NH3 : NO = 10: 30 = 1: 3
Stoichiometric molar ration NH3:NO = 4:6 = 2:3
NO is the limiting reactant.
Electrical energy exists when charged particles attract or repel each other.
PLEASE HELP
True or false
I think true..
Explanation:
im not sure.
Example 1 How much water (in grams) is produced when 65.2 grams of Calcium carbonate react with phosphoric acid to form calcium phosphate, water, and carbon dioxide?
Answer:
11.75 g H2O
Explanation:
3CaCO3 + 2H3PO4 --> Ca3(PO4)2 + 3H2O + 3CO2
MM H2O = 18.02 g/mol
MM CaCO3 = 100 g/mol
? g H2O = mass CaCO3 x (1 mol CaCO3/MM CaCO3) x (3 moles H2O/3 moles CaCO3) x (MM H2O / 1 mol H2O) = (65.2/100) x 18.02 = 11.75 g H2O
How many grams are there in 9.03 x 1023 molecules of CO2?
Answer:
The correct answer is - 66g.
Explanation:
Given:
molecules of CO2 = 9.03 x 10^23
We know:
1 mole of any substance = 6.02x10^23 molecules. (Avogadro's number)
M (CO2) = 12 + (2x16) = 12 + 32 = 44g
Solution:
The mass of CO2 with 9.03x10^23 molecules would be:
44g of CO2 = 6.02x10^23 molecules.
So, the mass in grams of CO2 (X) = 9.03x10^23 molecules
Xg of CO2 = (44x9.03x10^23)/6.02x10^23 = 66g
Thus, the correct answer would be - 66gm.
What are the general trends in first ionization energy across a period (LR) within the
periodic table? From bottom to top within a group?
The total mass of the __________________ and __________________ in an atom is the atomic mass.
Fill in the blanks Plzz
Answer:
protons, neutrons
Explanation:
There are three subatomic particles in all atoms: protons, neutrons and electrons. Of these three, only protons and neutrons are considered to have enough mass to contribute to overall atomic mass of the element.
Yes
OO
No
Balanced or Not Balanced? *
2 NaCl + 2 F2 → 2 NaF + 1 C12
Yes
No
Answer:
No, not well balanced
Explanation:
2Nacl+F2=2Naf+Cl2
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
what is an isotope
Answer:
each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.
Explanation:
Match “the same” or “different” to each sentence.
Answer:
different , same, same, same
In the reaction below identify the products. CH4 + 202 --> CO2 + 2H2O
Answer:
CO2 and H20
Explanation:
The products are on the right hand side of the equation.
What effect does the concentration of reactants have on the rate of a
reaction?
A. Changing the concentration has no effect on the reaction rate.
B. Increasing the concentration decreases the rate of the reaction.
O C. Increasing the concentration increases the rate of the reaction.
O D. The effect of concentration on rate varies within the reaction.
Answer:
C
Explanation:
The answer is C as concentration is a major factor affecting the rate of reaction and it has a direct relationship with the rate of reaction.
The effect that the concentration of reactants has on the rate of a reaction is increasing the concentration increases the rate of the reaction. The correct option is C.
What is a reactant?A reactant is a part of a reaction that is the first part of the reaction. Reactant can be more than one in the reaction. The different reactant reacts, and form a totally different product.
H2 + O2 = H2O
The hydrogen and oxygen are the reactants of the reaction.
Thus, the correct option is C. Increasing the concentration increases the rate of the reaction, as concentration plays a significant role in determining the rate of reaction and is directly related to it.
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Hey. Answers to this?:
I set off on a journey from the Earth to our nearest galaxy - ________. It will take me around 2 million ______ ______ before I reach my destination. As my space shuttle ascended it went through the Earth’s atmosphere in a great display of glowing lights. I reached the _______ __________ zone and started to float in my cockpit. The spacecraft went farther away, making the Earth look much smaller. I saw the bright light of our ________ _________ - the Moon. I speeded up, crossing the orbit of our ________ _______ - Mars. It took a great deal of skill to safely manoeuvre my spacecraft through the area of giant, rocky pieces of cosmic rubble, known as an _____ ______. As I accelerated, I entered the region of our ________ _______. I went zooming past Jupiter, Saturn and ________. I took a glimpse of our poor demoted dwarf planet - _______. Eventually, I was far enough to reach the outer edges of our ______ _______, with our star _________ in the centre. From that point on I accelerated rapidly, zooming out of our galaxy - ________ _____. What a spectacular view it was to see all the ____ ______ stars spinning in a giant whirlpool of light. Soon I reached the outer edges of our galaxy and went zooming away through the unknown towards Andromeda.
Missing words: the Sun, natural satellite, Uranus, asteroid belt, the Milky Way, outer planets, light years, Pluto, 400 billion, the Andromeda, inner planet, Solar System, zero gravity,
PLEASE ASAP! i have c,d,e and f but if anyone can do even one of them please help! (igcse y10 btw)
Answer:
C
i) 2 C(s) + O2(g) → 2 CO
ii) Carbon monoxide poisoning occurs when carbon monoxide builds up in your bloodstream. When too much carbon monoxide is in the air, your body replaces the oxygen in your red blood cells with carbon monoxide. This can lead to serious tissue damage, or even death.
D
The iron oxide gets reduced.
The carbon gets oxidised.
E
the reason is that aluminium is more reactive than carbon to be extracted in a blast furnance.an element lying lower in the metal reactivity series can be reduced by carbon (a reducing agent) but aluminum lies above carbon metal series.
F
i) electrolysis.
ii) It is soft and malleable. Aluminium is used in a huge variety of products including cans, foils, kitchen utensils, window frames, beer kegs and aeroplane parts. This is because of its particular properties.
A 30.0 mL aliquot of 0.0250 M HCl solution is titrated using 0.0500 M NaOH.
A) determine the volume of NaOH necessary and the pH at the equivalence point.
B) Determine the pH of the solution after 160.00 mL base is added.
Answer:
xdyd jdkdudktvko?ñhixiskrsjdjuxguxhicjovyx bhfoggu vohudixiyd siydyoxoyxyoxyixhoxiyxys ztiziyxyoxoyzyizitztixtx no se
hkgkfu
Explanation:
iyxyx yo gkxtuztizyidtiztizigxigxkhxhk. jvkgxitxoyfihciyxyixihxoyxyodyidtistusdtidti lo siento
A double replacement reaction has two compounds as reactants.
True or false
Answer:
yes, A double replacement reaction has two compounds as reactants.
hence it's true.......
Answer:
it's true...
Explanation:
Which compounds will most likely dissociate when dissolved in water? Select all that apply.
Answer:
A) barium hydroxide
B) ethanol
C) glucose
D) silver nitrate
E) dichloromethane
F) postassium chloride
The other compounds ethanol and glucose are also soluble in water but do not dissociate when dissolved in water.
Explanation:
Please mark this Brainilest.
These compounds will dissociate in water:
A) barium hydroxide
D) silver nitrate
F) potassium chloride
What are ionic compounds?Many compounds do separate when they are dissolved in water. Ionic substances break apart into a positive ion and a negative ion when placed in water, a process known as electrolytic or ionic dissociation. Ionization is the name given to this kind of dissociation reaction.When dissolved in water, many substances do dissociate. It is claimed that substances that dissolve in water form electrolytes, which are ions.Electrolytes can disintegrate into cations and anions after being dissolved, or they may be ionic substances that chemically react with water to produce ions.learn more about dissociation here: https://brainly.com/question/305470
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in which group in the periodic table do we not find metal A.Group 1 B.Group 2 C.Group 3 D.Group 5
Answer:
Group 5
Explanation:
Using method of elimination:
A. Group 1
Also known as the Alkali metals group. It contains metals such as lithium and sodium. This option is incorrect.
B. Group 2
Also known as the Alkali Earth metals group. It contains metals such as Magnesium and calcium. This option is incorrect.
C. Group 3
It contains metals such as Aluminium and scandium. This option is incorrect.
D. Group 5
This is the correct option. The elements in these group are non metals. Examples include Nitrogen.
What is the chemical formula for propane?
C38H
3C8H
C3H8
3CH8
Answer:
C38H
Thank You! :)
which one of the following forces is a contact force force of gravity or force of friction
Answer:
a force of friction would be like something moving that suddenly stops because of the texture of another object while a force of gravity would be something falling and gravity pulling it down :) hope this helps
Explanation:
(Help would be greatly appreciated) What is the molarity of a solution which contains 22.41 grams of NaCl in 50.0 mL of solution?
1. 0.488M
2. 7.67mol
3. 7.67M
4. 0.000767M
Answer:
7.67
Explanation:
According to molar concentration, the molarity of solution which contains 22.41 grams of NaCl in 50.0 ml of solution is 7.67 M.
What is molar concentration?Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.Substitution of values in the given formula gives, molarity= 22.41/58.44×1/0.05=7.67 M.
Thus, the molarity of solution which contains 22.41 grams of NaCl in 50.0 ml of solution is 7.67 M.
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.
7)
A 1-gram sample of which substance in a sealed 1-liter container will occupy the container
completely and uniformly?
A)
H2O(g)
B)
H2000)
C
Hg(0)
D)
Ag(s)
Answer:A) H20 gas
Explanation:
Based on the property of gases, 1-gram sample of hydrogen gas, H₂ in a sealed 1-liter container will occupy the container completely and uniformly.
What is the nature of a gas?Gases are one of the states of matter.
Gas molecules have negligible forces of attraction between them, therefore, they are always in motion.
Gases do not have a specific shape or volume, rather they fill up every available space in their container.
Of the given option, only H₂ is a gas.
Therefore, 1-gram sample of hydrogen gas, H₂ in a sealed 1-liter container will occupy the container completely and uniformly.
Learn more about gases at: https://brainly.com/question/25736513
which of the following solids would not decompose on heating
Answer:
Anhydrous sodium carbonate is stable to heat and does not decompose even when it is heated to redness. This is because sodium carbonate salt on heating with acids react to release carbon dioxide.
9. What does C12 (g) represents?
A. Chlorine ions
B. Chlorine liquid
C. Chlorine gas
D. Chlorine atom
Answer:
chlorine gas since it exists as a diatomic molecule
I need help I don’t get this
Answer:
Visit: gotit-pro.com
Explanation:
the following punnett square shows a cross between two hybrid flowers. if the flowers show incomplete dominance, what fraction are pure red? I NEED HELP PLZ!
Answer:
1/4
Explanation:
Incomplete dominance is when the dominant ("R") gene is not completely dominant and cannot fully mask or cover the recessive ("r") gene. This means that it will result in both genes expressing and a mix of traits appearing. In the case of a flower with "R" genes for red and "r" genes for white, the following possibly combinations exist:
RR = all red, no white "r" gene
Rr = pink, as both the "R" and "r" genes are expressed
rr = white, no red "R" gene
The Punnett Square shows that only one of the four phenotypes is RR and red.
Mixing salt with sugar is a chemical change true or false?
Answer:
False unless you add something else with the like the common sugar ice and salt science project.
Explanation:
Answer:
No
Explanation:
No, mixing salt and sugar is not a chemical reaction. Chemical reactions result in the change of chemical composition of one or more substances(it is no longer able to be turned back to normal
Diamonds have a density of 3.26 g/mL. What would be the mass of a diamond with a volume
of 0.350 mL?