Answers
Related Questions
What is responsible for the blue sky?
Answers
Answer:
The blue color of the sky is caused by the scattering of sunlight off the molecules of the atmosphere.
Explanation:
Answer:
sun shine
Explanation:
Sunlight reaches Earth's atmosphere and is scattered in all directions by all the gases and particles in the air. Blue light is scattered more than the other colors because it travels as shorter, smaller waves. This is why we see a blue sky most of the time
What happens yo temperature in your layer as u you go higher in altitude?
Answers
Answer:
Temperatures decrease with increasing height as the ozone layer is left behind and the air thins out with increasing altitude. The lowest portion of the low-pressure mesosphere is heated by the warm air of the upper stratosphere. This heat radiates upward, getting less intense as altitude increases.
Explanation:
Brainliest please?
1. How much energy (in KJ) is required to convert 50.0g of ice at – 30 ˚C to
steam at130˚C.
Answers
Answer:
How much heat energy required to convert following?
How much heat energy, in kilojoules, is required to convert 47.0 g of ice at -18.0 C to water at 25.0 C ?
Specific Heat of Ice - 2.09 j/g * c
This is how I did it and the answer is wrong...Please check and correct me
Q = m * Cice * Change in Temp
Q = (47.0 g)(2.09 J/g*c)(43) = 4222.6 J * 0.001 kj / j = 4.22 kj
Plz help
A candle burning is an example of
A. an endothermic change
B. a physical change
C. energy being taken in
D. an exothermic change
Answers
Answer:
D
Explanation: An exothermic change is Because it has heat.
If 1520 J are added to 16.5 g of water at 63.1 c what will the final temperature be
Answers
(a)² + (b)² = ?
help please
Answers
answer:
a^2+b^2= (a+b)² -2ab
WILL GIVE BRAINLIEST
Which statement describes earthquakes?
They release energy.
They are caused by reduced stress in rocks.
They begin at the epicenter.
They result from movement on Earth’s surface.
Answers
Answer:
A
Explanation:
any help would be much appreciated, i'm being timed :( i'll mark brainliest and 5 star
Answers
Answer:
3 times ....
group 2
Explanation:
Please help RN!! It’s due in 10 mins T^T I’ll give brainliest !!
Select the correct location on the image.
Which of these four elements is the most reactive metal?
Answers
Explanation:
the answer is rubidium
Answer:
the answer is Rb
Explanation:
i got it right
what atoms are in Au(NO2)2
Answers
how many bonds can nitrogen have
Answers
Answer:
3
Explanation:
I think so, let me know if its wrong.
Which two changes of state can occur when a substance gains thermal
energy?
Answers
Answer:
Adding enough thermal energy to a substance can cause a change of state to occur. The change of state from a solid to a liquid is called melting. When energy is added to an ice cube, the ice particles speed up as energy is absorbed. When the particles move fast enough, the solid ice melts and becomes liquid water
Answer:
c and d
Explanation:
When drawing a covalent lewis dot diagram its important to ensure that:
A each atom is surrounded by 6 electrons
B all symbols are in lower case letters
C all the elements have a charge in the top right side
D each atom is surrounded by 8 electrons
Answers
Not sure if it’s correct but Lina positive it is
ANSWER THESE 5 MULTPLE CHOICE QUESTIONS!!!
I'LL GIVE 30 POINTS AND A BRAINIEST:)
Answers
Answer: 1, magnesium & mg
2, two energy shells
Explanation:
Find the number of moles of argon in 534 g
of Argon
Answers
Answer:
13.4 mol Ar
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisExplanation:
Step 1: Define
534 g Ar
Step 2: Identify Conversions
Molar Mass of Ar - 39.95 g/mol
Step 3: Convert
[tex]534 \ g \ Ar(\frac{1 \ mol \ Ar}{39.95 \ g \ Ar} )[/tex] = 13.3667 mol Ar
Step 4: Check
We are given 3 sig figs. Follow sig fig rules and round.
13.3667 mol Ar ≈ 13.4 mol Ar
Answer:
The number of moles in 452 grams of Argon is 13.31 moles.
Explanation:
What are the three types of protist and how are they similar and how are they different (this is science but there is no tab for it)
Answers
Answer:
They are eukaryotic, which means they have a nucleus. Most have mitochondria
Hydrofluoric acid is what type of acid?
Answers
Hydrofluoric acid is a solution of hydrogen fluoride (HF) in water. Solutions of HF are colourless, acidic and highly corrosive. It is used to make most fluorine-containing compounds; examples include the commonly used pharmaceutical antidepressant medication fluoxetine (Prozac) and the material PTFE (Teflon).
In science, all ideas are not tested with evidence from the natural world.
Question 4 options:
True
False
Answers
Answer:
i belive its trrue
Explanation:
Answer:
i think its false i hope this helps
Explanation:
Which statement about the alkali metals is correct?
A. They are usually gases.
B. They are extremely unreactive.
C. They are located in the left-most column of The Periodic Table
D. They form negative ions with a -1 charge
Answers
Answer:
its c they are located in the left most column of the periodic table
Question 6 W If 50. mL of 1.0 M NaOH is diluted with distilled water to a volume of 2.0 L, the concentration of the resulting solution is А 0.025 M B 0.050 M C 0.10 M D 0.50 M E 1.0 M
Answers
Answer:
im not sure man
Explanation:
What are interactions between flip flops and sulfuric acid
Answers
Which of the following is an example of a chemical change?
a. freezing water to make ice.
b. a firework exploding.
c. breaking a glass bottle.
d. melting gold jewelry to make a gold bar.
Answers
Answer:
b. a firework exploding
Explanation:
Una muestra de 2,36 gramos de NaHCO3 se descompuso completamente en un experimento. 2NaHCO3 → Na2CO3 + H2CO3 En este experimento, el dióxido de carbono y los vapores de agua se combinan para formar H2CO3. Después de la descomposición, el Na2CO3 tenía una masa de 1,57 gramos. Determine la masa del H2CO3 producido. Calcule el porcentaje de rendimiento de H2CO3 para la reacción.
Answers
Answer:
105%
Explanation:
El porcentaje de rendimiento se define como la masa obtenida del producto (En este caso, en términos de H2CO3), dividida en la masa teórica que debe ser producida.
La masa real se obtiene con las moles del otro producto que fueron producidas (Que son las mismas moles producidas de H2CO3)
Y la masa teórica se obtiene a partir de las moles de reactivo adicionadas:
Masa teórica:
2.36g NaHCO3 * (1mol / 84g) = 0.0281 moles de NaHCO3
0.0281 moles de NaHCO3 * (1mol H2CO3 / 2 moles NaHCO3) =
0.014 moles de H2CO3 son producidas. La masa es:
0.014 moles de H2CO3 * (62g / mol) = 0.871g es la masa teórica
Masa real:
1.57g Na2CO3 * (1mol / 106g) = 0.014 moles de Na2CO3
0.0148 moles de Na2CO3 * (1mol H2CO3 / 1 moles Na2CO3) =
0.0148 moles de H2CO3 son producidas. La masa es:
0.0148 moles de H2CO3 * (62g / mol) = 0.918g es la masa real producida
Así, el porcentaje de rendimiento es:
0.918g / 0.871g * 100 =
105%
can I please get help with it
Answers
Answer:
True
Explanation:
IT IS TRUE WIWJJWOWIWHW
MOLES AND MOLAR MASS
Answers
2030g C6H8O7 (1 mol/ 192.124g) = 10.6 mol C6H8O7
Please help
As the temperature increases, the molecular motion of the molecules decreases and it
becomes difficult to overcome the polar attractions.
a. TRUE
b. FALSE
Answers
step by step explanation:
What Is It?
Imagine you find a bowl filled
with clear liquid in your kitchen. List three liquids it might be. Describe how you could use the liquid's physical and chemical properties to determine which of the three it is.
Answers
Answer:
physical
Explanation: water can change from solid to liquid to a gas
1, If the “R” under the group title represent the elements in that group, then how any atoms of Na (sodium) will react with 1 atom of O (oxygen).
2. If the “R” under the group title represent the elements in that group, then how any atoms of Na (sodium) will react with 1 atom of H (hydrogen).
Answers
Answer:
NaH one atom of sodium react with one hydrogen to form sodium hydride
Explanation:
Use the balanced equation given below to solve the following problem; Calculate the volume in liters of CO produced by the reaction of 175 g of Sb2O3.
Sb2O3 + 3 C --> 2 Sb + 3 CO
40.3 L CO
7.81 L CO
20.2 L CO
13.4 L CO
Answers
Answer: 40.3 L
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} Sb_2O_3=\frac{175g}{291.5g/mol}=0.600moles[/tex]
[tex]Sb_2O_3+3C\rightarrow 2Sb+3CO[/tex]
According to stoichiometry :
1 moles of [tex]Sb_2O_3[/tex] produces = 3 moles of [tex]CO[/tex]
Thus 0.600 moles of [tex]Sb_2O_3[/tex] will produce=[tex]\frac{3}{1}\times 0.600=1.80moles[/tex] of [tex]CO[/tex]
Volume of [tex]CO=moles\times {\text {Molar volume}}=1.80moles\times 22.4L/mol=40.3L[/tex]
Thus 40.3 L of CO is produced.
Sodium is a soft, white metal that reacts violently with water. Chlorine is a poisonous yellow-green gas. During the chemical reaction between sodium and chlorine, table salt is produced. Which of the following statements correctly compares and contrasts the reactants with the resulting products used in a chemical equation?
A. The reactants are dangerous and the product can be eaten
B. The reactants and the products observe the law of conservation of mass
C. The reactants are a solid and a gas and the product is a gas
D. The reactants and the products are the same color
Answers
Answer:
B. The reactants and the products observe the law of conservation of mass
Explanation:
The reaction equation is given as:
2Na + Cl₂ → 2NaCl
Such a chemical reactions usually obeys the law of conservation of mass. The law states that "in a chemical reaction, matter is neither created nor destroyed but bonds are rearranged".
So, the most correct thing is that reactants and products observe the law of conservation of mass. The number of atoms on both sides of the expression will be the same. Therefore, option B is correct.