Answer: The atmosphere of Earth wasn't always full of oxygen. ... An accidental mutation would some day change the world forever as these organisms would become able to feed off of the sunlight around them, and produce oxygen in a process known as photosynthesis. This oxygen, which none of these organisms could use, was toxic.
Students A and B mix two solutions together during a lab investigation. Both students observe a temperature change and a production of gas being emitted. Student A concludes that there has been a chemical change. Student B concludes that there has not been a chemical change, but rather a physical change. Which student's conclusion is valid, based on the information provided?
Answer:whjwjehd
Explanation:
Luna finds a plant in the forest and is curious about the type of plant she is viewing. She notices the plant has a woody stem and is about a foot taller than she is. Based on this description alone, what is most likely true about this species?
Answer:
vascular
Explanation:
cuz i know
Answer:
vascular :D
Explanation:
How are groundwater and surface water related?
Answer:
Surface water and groundwater systems are connected in most landscapes. ... It is the groundwater contribution that keeps streams flowing between precipitation events or after snowmelt. For a stream to gain water, the elevation of the water table in the vicinity of the stream must be higher than the streamwater surface.
Explanation:
I have a question, about trends in the periodic table. Mostly focusing on ionization energy. From going from right to left it increases as the atom's size decreases. Can someone explain why this happens? Like why does it increase as the size decreases Thank you.
When 0.25 moles of NH3 are produced according to the reaction below, how many moles of H2 must have reacted?
N2 + 3 H2 --> 2 NH3
O 1.5 moles H2
O 0.38 moles H2
O 0.25 moles H2
O 0.17 moles H2
Answer:
Explanation:
by stoichiometry
nNH3/2=nH2/3
0.25/2=nH2/3
nH2=0.25×3/2
nH2=0.375 mol
so its 0.38 mol
Answer:
I have this quiz rn I will try 0.38 if it is right I’ll edit this and say that
Explanation:
A solution of copper sulfate (CuSO4) produced by bioleaching has a concentration of 0.319 g/dm3 Relative atomic masses (Ar): Cu = 63.5 O = 16 S = 32 Calculate the number of moles of copper that can be produced from 1 dm3 of this solution.
moles Cu produced : 0.002
Further explanationConcentration of copper sulfate (CuSO₄) : 0.319 g/dm³
MW CuSO₄ :
[tex]\tt =63.5+32+4\times 16=159.5~g/mol[/tex]
mol CuSO₄ /dm³ :
[tex]\tt \dfrac{0.319}{159.5}=0.002[/tex]
CuSO₄⇒Cu²⁺ + SO₄²⁻
mol Cu : mol CuSO₄ = 1 : 1 , so mol Cu²⁺=0.002
How can radiation, conduction, and convection affect a city? (like Atlanta)
There are several different models that represent compounds. One type of model is shown.
3 C's connected in a line by 2 black lines. The first and third C's each have 3 H's connected to them by a single black line each. The middle C has 2 H's connected to it by a single black line each.
What type of model is shown?
A) structural formula
On edge
Answer:
A
Explanation:
someone help me please i’ll give brainly
Answer:
D) All of the above
Explanation:
When the temperature of an object increases, the average kinetic energy and speed of its particles increases. When the average kinetic energy of its particles increases, the object's thermal energy increases. Therefore, the thermal energy of an object also increases as its temperature increases.
25 points , hi! please look at the attachment for the question, I'm having a hard time because all I have to do is solve through those 2 problems but I'm not sure if I solve the fractions first then multiply that result by 100 or what. I asked my teacher which she helped a little but I don't think she understood where I was lost. If you can help I would really appreciate it. Thank you.
This was the set up question:
4. If 100.0g of nitrogen gas (N2) is reacted with 100.0g of hydrogen gas (H2) to form NH3. What is the limiting and excess reactants?
Hint: Convert grams to moles for each reactant and then convert to moles of NH3. You need your balanced equation from answer 1 to determine the mole relationship between each reactant and the product NH3. Use the periodic table to determine the molar mass of all chemical formulas. Fill in the “?” blanks below to show your work.
and in the screenshot it has everything I'm working with and the conclusions I need to draw from it, I can draw the conclusions just fine on my own but I need help solving.
Answer:
To answer the question, we correctly fill the attached screenshot as follows;
3H₂ + N₂ → 2NH₃The molar mass of H₂ = 2 g/mol[tex]100.0 g \ H_2 \times \dfrac{1 \ mol \ H_2}{2 \ g \ H_2} \times \dfrac{2 \ mol \ NH_3}{3 \ mol \ H_2} = 33.\bar 3 \ mol \ NH_3[/tex]
The molar mass of N₂ = 28 g/mol
[tex]100.0 g \ N_2 \times \dfrac{1 \ mol \ N_2}{28 \ g \ N_2} \times \dfrac{2 \ mol \ NH_3}{1 \ mol \ N_2} \approx 7.143 \ mol \ NH_3[/tex]
A. Therefore, the excess reactant is hydrogen gas H₂ because it makes the most amount of ammonia, NH₃ (33.[tex]\bar 3[/tex] moles of NH₃)
B. The limiting reactant in nitrogen, N₂, because it is the reactant that makes the least amount of the ammonia, NH₃ (approximately 7.143 mol NH₃)
C. The theoretical yield of ammonia, is the maximum amount of ammonium that can be produced from the reaction between the 100 g of hydrogen gas, H₂, and 100 g of nitrogen gas, N₂ which is given by the amount of ammonia produced by the limiting reactant which is approximately 7.143 mole of NH₃
Explanation:
Answer:
Explanation:
Did u ever get answer
What are the common characteristics among acidic compounds? Basic?
Answer:
turns blue litmus red
reacts with metal
increase hydrogen concentration
Momentum is mass times
A. acceleration
B. velocity
C. distance
B. velocity
This is the answer
Can someone pls do this
Explanation:
Sodium sulfate
Na₂SO₄
The sulfate ion is SO₄²⁻
Sodium sulfite
Na₂SO₃
The sulfite ion is SO₃⁻
Sodium sulfide
Na₂S
The sulfide ion is S²⁻
Sodium phosphate
Na₂PO₄
Phosphate ion is PO₄²⁻
Sodium phosphite
Na₃PO₃
The phosphite is PO₃³⁻
Sodium phosphide
Na₃P
The phosphide ion is P³⁻
PLEASEEEE Hurry its due in 20 min
Complete and balance each of the following equations for acid-base reactions.
HClO4(aq)+NaOH(aq)→
Express your answer as a chemical equation. Identify all of the phases in your answer.
Answer:
HCl[tex]O_{4}[/tex](aq) + NaOH → NaCl[tex]O_{4}[/tex](aq) + [tex]H_{2} O[/tex](l)
Explanation:
water is a liquid if you can't see
What are the following is example of physical property
Answer:
ig b
Explanation:
u didnt show a picture of it so I cant help
What are the coefficients that will balance the skeleton equation below?
___GaF3 +___KCN rightwards arrow___Ga(CN)3 + ___KF
A.
1, 3, 1, 3
B.
3, 1, 3, 1
C.
1, 1, 1, 3
D.
1, 3, 3, 1
1 points
QUESTION 6
The previous question is an example of what type of chemical equation?
A.
Synthesis
B.
Decomposition
C.
Single Re-Placement
D.
Double Re-Placement
1, 3, 1, 3
Explanation:
Ga - one on both sides
F - three on both sides
CN - three on both sides
K - three on both sides
But remember that CN was being multiplied by 3 on the right side already, meaning GA(CN)3 didn't mean a coefficient.
Answer:
Double re-placement
The two metals switched dance partners, that means it's a double.
What is the density of a
sample of a substance with a volume of
120 mL and a mass of 90 grams?
Answer:
The density of the unknown substance is 0.75 g/mL.
Explanation:
We are given the volume and mass of a substance and are asked to find the density.
Density is determined with the formula [tex]d=\frac{m}{v}[/tex], where d is the density, m is the mass of the substance, and v is the volume the substance occupies.
Therefore, the density can be found by dividing the mass and volume.
We are given and can determine that:
The volume is 120 mL (v).The mass of the substance is 90 grams (m).Our derived unit is going to be g/mL.Now, let's set up the math required.
[tex]d = \frac{90 \ \text{grams}}{120 \ \text{mL}}\\\\d = \frac{3 \ \text{grams}}{4 \ \text{mL}}\\\\d = \frac{3}{4} \ \text{grams per mL}\\\\d = \frac{3}{4} \ \text{g/mL}\\\\ \bold{d = 0.75 \ \bold{g/mL}}[/tex]
Therefore, the density of the substance is 0.75 g/mL.
In lab you reacted 60 grams of propane (C3H8) with 13 grams of oxygen gas (O2). Your
reaction made 63 grams of water (H2O). The reaction is shown below:
How much carbon dioxide (CO2) is released into the air?
C3H8 + 5O2 ------> 3CO2 + 4H2O
10 g
73 g
120 g
1368
Answer:
120g
Explanation:
Based on the reaction, when 1 mole of propane and 5 moles of oxygen react, 3 moles of CO2 and 4 moles of H2O are produced. The ratio of production is 3 moles of CO2 per 4 moles of H2O.
Thus, we need to convert mass of water to moles using its molar mass:
Moles H2O (Molar mass: 18g/mol):
63g H2O * (1mol / 18g) = 3.5 moles H2O
Converting to moles of CO2:
3.5 moles H2O * (3 moles CO2 / 4 moles H2O) = 2.625 moles CO2
Mass CO2 (Molar mass: 44g/mol):
2.625 moles CO2 * (44g / mol) = 115.5g of CO2 are released
120gwhich of the following explains why salt water is considered a mixture
Answer:
sal5 water = kaka
Explanation:
because i need points ty man
I'll give brainliest
Answer: Nitrogen
Explanation:
someone help me please i’ll give brainly
Answer:
it is endothermic change ..........
Answer:
Endothermic change
Explanation:
Khan Academy:
"The reactants are at a lower energy level compared to the products—as shown in the energy diagram. Since we are forcing the reaction in the forward direction towards more unstable entities, overall ΔH for the reaction is positive, i.e., energy is absorbed from the surroundings."
- The answer is from a khan academy lesson.
Brainliest appreciated! Hope I helped!
What two molecules are involved in cellular respiration?
Protein
oxygen
glucose
fiber
Please help!!!
This equation is balanced: Al+N2–2AIN
True
False
Answer:
true
Explanation:
There are a ton of things that you can find on the interenet
Answer:
False
Explanation:
The ground state electron configuration of As
Answer:
Arsenic atoms have 33 electrons and the shell structure is 2.8. The ground state electron configuration of ground state gaseous neutral arsenic is [Ar]. 3d10. 4s2.
Explanation:
Jimmy has a sick friend who called and asked him to bring over some soup from the store. Jimmy rode his bicycle from his house to the store and then to his friend's house. What is the total distance Jimmy traveled?
Answer:
See the answer below
Explanation:
The total distance Jimmy traveled would be the sum of the distance covered from his house to the store and then from the store to his friend's house. The total distance covered can be determined if the average speed of Jimmy and the time he took to cover the distance are known.
Average speed = total distance traveled/total time taken
Hence,
total distance traveled = average speed x total time.
describe a habitat of giraffe or an elephant(i prefer the giraffe tho, and please make it reasonable)
Answer: Savanna, Woodland, or Grassland.
Giraffes eat new shoots and leaves, their habitat needs to have a good supply of trees -- they flock towards acacia trees in particular. Giraffes use their extremely long legs, necks and tongues to browse mainly from the thorns on the acacia tree. The tongue and the inside of the mouth are lined with tough tissue that protects against the thorns.
*NEED HELP ASAP!*
Click on photo!
Please help meeee!!!
Answer:
What type of math are you taking.:)
Answer:
CaO
Explanation:
becoz
Ca O
2 2
you must crossing over the eqn
and get CaO
If the reacants of a chemical raction have 15 Carbon atoms, 72 Lead
atoms, and 88 Nitrogen atoms, what will the products have?
Answer:
In the human body, potential energy is stored in the bonds between atoms and molecules. Chemical energy is the form of potential energy in which energy is stored in chemical bonds. When those bonds are formed, chemical energy is invested, and when they break, chemical energy is released. Notice that chemical energy, like all energy, is neither created nor destroyed; rather, it is converted from one form to another. When you eat an energy bar before heading out the door for a hike, the honey, nuts, and other foods the bar contains are broken down and rearranged by your body into molecules that your muscle cells convert to kinetic energy.
Explanation:
In DNA, adenine always pairs with?
Thymine
cytosine
Guanine
In an experiment conducted between oxygen and chlorine gas it was found that oxygen gas spread much faster than chlorine. What is the explanation for this observation?
Answer:
Because oxygen is lighter
Explanation: