Answer:
life of leaf and leaf is obob
Scientists often use controlled experiments to answer questions. Choose the three correct statements about controlled experiments. (PLEASE INCLUDE THREE ANSWERS)
A) No changes are made to a test group in an experiment.
B) A control group is used for comparison to other groups. Eliminate
C) Only one change can be made per test group in an experiment.
D) Changes can only be made to the control group in an experiment.
E) A controlled experiment must have a control group and test group(s).
If anyone could help with this that would be amazing!
Answer:
Ima go with E I'm still taking the test...
Explanation:
if not E its B but E is the only one that makes sense...
Answer:
Actually it was that is worked but only for 10 days
Explanation:
I took the science unit test
A gas has a density of 1.57g/L at 40.0C and 2.00atm of pressure. What is the identity of the gas?
Answer:
Neon
Explanation:
K=C degrees+273.15 = 40.0+273.15=313.2 K
M=1.57g/L×0.08206 atm L/mol K×313.2 K/2.00 atm
M=20.17 g/mol
K= Kelvin
M= Molar Mass
how do carbon and silicon differ with regard to the types of orbital available for hybridization?
Give an example of two different compounds that have a hydrogen bonding interaction when mixed together.
what would be the effect if electrons were loosely held
Answer:
I'm pretty sure They will exhibit high conductivity, ductility, and malleability because of their atomic structure.
Explanation:
I'm not 100 percent sure
How to balance K+H20?
Answer: K + H2O = KOH + H2
Explanation:
When the volume of a gas is changed from 1146 mL to 765 mL, the temperature will change from __ K to 640 K
Answer:
Explanation:
According to Charles rule,
[tex]\dfrac{V_{1}}{T_{1}}=\dfrac{V_{2}}{T_{2}}[/tex]
V₁ = initial volume = 1145 mL
V₂ = final volume = 765 mL & T₂ = final temperature = 640 K
[tex]\dfrac{1145}{T_{2}}=\dfrac{765}{640}\\\\\\Cross \multiply\\\\1145*640=T_{2}*765\\\\\dfrac{1145*640}{765}=T_{2}\\\\T_{2} = 957.9 \ K[/tex]
How many atoms are in 3.5 L of Neon at STP?
Answer:
This is the answer to the question 0.1734
Explanation:
3.5/20.18
=0.1734
How many moles are in 15g of Na2CO3?
Answer:
105.98844
Explanation:
Calcium carbonate is reacting with hydrochloric acid and water to form the products calcium chloride hexahydrate and carbonic acid(which decomposes into water and carbon dioxide). Note: water is part of this reaction! if 10.76 g of calcium reacts with 10.51 g of hydrochloric acid, calculate how many grams of the hydrate will be formed
I need the written reaction, the limiting reactant work, and lastly, the stoichiometry work
Answer:
11.5 g
Explanation:
28.0 g
−
16.5 g
=
11.5 g
why do silver mecury cupper gold not react with water
Since gold and silver are the least reactive metals, they do not react with water. The surface of metallic lead is covered by a thin layer of lead oxide,. As a result, it does not react with water in normal circumstances.
Explanation:
Hope it helps you!!Answer:
why do silver mecury cupper gold not react with water
Explanation:
why do silver mecury cupper gold not react with water
Oscar made a terrarium by filling a jar with some rocks, soil, plants, and water.
Oscar placed a grasshopper in the terrarium and then put a lid on the jar. From what source will the grasshopper receive enough oxygen to survive?
from the soil
from the soil
from the plants
from the plants
from the rocks
from the rocks
from the water
from the plants
Explanation:
bc plant produce 02
A 35.3 g of element M is reacted with nitrogen to produce 43.5 g of compound M3N2 What is (i) the molar mass of the element and (ii) name of the element?
This problem is providing us with the mass of an unknown element which produces 43.5 g of M3N2. Thus, its name and molar mass are required and found to be 4.02 g/mol and calcium nitride after the following:
Stoichiometry.In chemistry, stoichiometry is a tool used for the calculation of masses or moles involved in chemical reactions, by the utilization of molar masses and mole ratios based on proportional factors.
In such a way, for the given reaction, one can use the formulas to write the following balanced chemical equation:
[tex]3M+N_2\rightarrow M_3N_2[/tex]
Where there is a 3:1 mole ratio of the metal to the product, which means we can use the following stoichiometric setup:
[tex]35.3gM*\frac{1molM}{x}*\frac{1molM_3N_2}{3molM} *\frac{(3x+14.01*2)gM_3N_2}{1molM_3N_2}=43.5gM_3N_2[/tex]
Now, by using the numbers only, one will be able to calculate x as the atomic mass of the element M in g/mol:
[tex]35.3*\frac{1}{x}*\frac{1}{3} *\frac{3x+14.01*2}{1}=43.5\\\\\frac{105.9x+989.106}{3x}=43.5\\ \\105.9x+989.106=130.5x\\\\989.106=130.5x-105.9x\\\\x=\frac{989.106}{130.5-105.9} =40.2g/mol[/tex]
Which matches with the molar mass of calcium. Moreover, we find its name as calcium nitride.
Learn more about stoichiometry: brainly.com/question/9743981
I don't really think what this question about
Answer:
A single time the hail stone was drafted up and down in the atmosphere
Explanation:
Pick a "for every" statement about copper and silver nitrate for this reaction.
A For every 1 mole of copper, the reaction uses 2 moles of silver nitrate.
B For every 1 mole of copper, the reaction makes 2 moles of silver nitrate.
C For every 1 mole of copper, the reaction uses 3 moles of silver nitrate.
D For every 1 mole of copper, the reaction uses 1 moles of silver nitrate.
From the equation of the reaction; for every 1 mole of copper, the reaction uses 2 moles of silver nitrate.
What is a reaction?A chemical reaction involves the transformation of one chemical specie into another. The reaction is not shown here hence the question is incomplete.
However, the reaction should be of the sort; Cu + 2AgNO3 ---> Cu(NO3)2 + Cu. Thus, for every 1 mole of copper, the reaction uses 2 moles of silver nitrate.
Learn more about chemical reaction: https://brainly.com/question/6876669
Which of the following is an example of a response to the stimulus of a dangerous predator?
A.
a skunk releases a pungent odor
B.
a bee makes honey
C.
a human stomach growls
D.
a tree's leaves change colors
The element least likely to obey the octet rule in forming chemical bonds is
Answer:
The two elements that most commonly fail to complete an octet are boron and aluminum; they both readily form compounds in which they have six valence electrons, rather than the usual eight predicted by the octet rule.
I think it will help you.
When 200.0 mL of a 0.125 M sodium hydroxide is combined with 400.0 mL of a 0.025 M solution of magnesium nitrate, what is the percent yield if 0.45 g of precipitate is isolated?
Answer:
Explanation:
Balanced equation :
2NaOH (aq) + Mg(NO3)2 (aq) → Mg(OH)2(s) + 2NaNO3(aq)
2 mole NaOH reacts with 1 mole Mg(NO3)2 to produce 1 mole Mg(OH)2.
Check for limiting reactant :
Mol NaOH in 200.0 mL of 0.125 M solution
Mol = 0.125 mol/L * 200 mL / 1000 mL/L = 0.025 mol
This will react with 0.025 / 2 = 0.0125 mol Mg(NO3)2
Mol Mg(NO3)2 in 400 mL of 0.025 M solution
= 400 mL / 1000 mL/L * 0.025 mol /L = 0.01 mol Mg(NO3)2
The NaOH is in excess and the limiting reactant is Mg(NO3)2
0.01 mol Mg(NO3)2 will produce 0.01 mol Mg(OH)2
Molar mass Mg(OH)2 = 58.32 g/mol
Mass of 0.01 mol Mg(OH)2 = 0.01mol * 58.32 g/mol = 0.5832 g
Product isolated was 0.45 g
Percent yield = Product / Reactant * 100%
= 0.45 / 0.5832 * 100%
= 77.16% yield.
Balance the equation: ___Li3N + ___NH4NO3 -> ___LiNO3 + ___ (NH4)3N
What type of reaction is the one above?
Answer: Li3N + 3NH4NO ---> 3LiNO3 + (NH4)3N
Explanation: Above is a double displacement/replacement reaction since two compound are sought as displacing.
Hope this helps!
discuss whether glucose is a mixture of water and carbon dioxide or is it a new compound?
Answer:
SEE BELOW
Explanation:
Glucose (C6H12O6) is an organic compound composed of the elements carbon, hydrogen and oxygen.
Lewis structure of Hydroxide ion and it's formal charge
Answer:
Hopefully this was helpful!
In this structure, Oxygen (O) is the central atom, and it is bonded to one Hydrogen (H) atom. Oxygen also has two lone pairs of electrons.
To calculate the formal charge, we need to determine the valence electrons of each atom and compare them to the number of electrons assigned to the atom in the Lewis structure.
For Oxygen (O):
Valence electrons = 6
Number of lone pairs = 2
Number of bonding electrons = 2 (from the bond with Hydrogen)
Formal charge = Valence electrons - Lone pairs - Number of bonding electrons
= 6 - 2 - 2
= 2 - 2
= 0
For Hydrogen (H):
Valence electrons = 1
Number of bonding electrons = 2 (from the bond with Oxygen)
Formal charge = Valence electrons - Number of bonding electrons
= 1 - 2
= -1
Therefore, the formal charge of Oxygen in the hydroxide ion (OH-) is 0, and the formal charge of Hydrogen is -1.
Learn more about Lewis Dot Structure, here:
https://brainly.com/question/28652824
#SPJ6
Balance the following chemical equation (if necessary):
Answer:
1 [tex]C_{3}H_{6}O_{2}[/tex] (g) + 6 [tex]O_{2}[/tex] (g) → 3 [tex]H_{2}O[/tex] (g) + 3 [tex]CO_{2}[/tex] (g)
which chemical equations show an oxidation- reduction reaction
Answer:
O2 + 2H2 → 2H2O MgSO4 + CaCl2 → MgCl2 + CaSO4 2Al + 6HI → 2AlI3 + 3H2 FeCl2 + Na2CO3 → FeCO3 + 2NaCl 2AgNO3 + Na2S → Ag2S + 2NaNO3
What's the difference between a conductor and an insulator?
I'll mark you as brainliest
One day you experience violent thunderstorms followed by a few days of colder weather.
Which type of front most likely moved through your area?
occluded front
stationary front
warm front
cold front
Answer: Cold front
Answer:
Cold front lol
Explanation:
Hopefully this helps :)
Dale marc is a 16-years -old stident. he lives in taal,batangas,together with his family. fishing is their primary source of income. they found out that the taal volcano had erupted in taal batangas. what are the possible effects / of this condition on thier condition on their family, and what advice are you going to give him?
The possible effects of this condition on the family is adverse because they can't do fishing due to eruption.
Effects of volcanic eruption on fishing
Aquatic life can be affected due to volcanic eruption due to increase in acidity, change in temperature, and change in food supply. These factors can damage and also kill fish so this eruption has adverse effect on the family's economic condition and my advice is to them to change their place of living and settle in other unaffected area.
Learn more about volcano here: https://brainly.com/question/1258078
Why are the waters of the North Atlantic, like the waters near coral reefs, murky green? 1. The color is caused by chlorophyll in the water.
2. The color is caused by the waste products given off by fish.
3. The color is caused by coral reefs in the area.
4. The color is caused by the lack of oxygen in the water
The waters of the North Atlantic are murky green because the color is caused by coral reefs in the area. That is option 4.
The effects of overgrowth of algaeThe excess nitrogen and phosphorus which is found in fertilizers can cause an overgrowth of algae in a short period of titme, when washed into water bodies. This is called algae blooms.
The effects of overgrowth of algae on aquatic bodies include the following:
reduce the ability of fish and other aquatic life to find food It causes thick, green muck that impacts clear water, recreation, businesses and property values.Therefore, the murky green color is caused by coral reefs in the area.
Learn more about coral reefs here:
https://brainly.com/question/10770235
Answer:
The waters of the North Atlantic are murky green because the color is caused by coral reefs in the area. That is option 4.
The effects of overgrowth of algae
The excess nitrogen and phosphorus which is found in fertilizers can cause an overgrowth of algae in a short period of titme, when washed into water bodies. This is called algae blooms.
The effects of overgrowth of algae on aquatic bodies include the following:
reduce the ability of fish and other aquatic life to find food
It causes thick, green muck that impacts clear water, recreation, businesses and property values.
Therefore, the murky green color is caused by coral reefs in the area.
Learn more about coral reefs here:
brainly.com/question/10770235
Explanation:
13.41g of Fe(NO3)2 is dissolved in 83.0mL of water. Calculate the molarity of the solution.
Answer:
whats the question in this
Explanation:
1 mole of Cl2 will produce how many atoms of KCl?
Answer:
1.1 mole
Explanation:
The mass of potassium chloride is 3.8 g . Look at the mole ratio you have between potassium chlorate and potassium chloride; what you will see is that every 2 moles of potassium chlorate will produce 2 moles of potassium chloride, i.e. you have a 1:1 mole ratio between the two compounds
Which product (if any) will form a precipitate in the following reaction?
3CaCl2(aq) + 2Na3PO4(aq) --> Ca3(PO4)2 + 6NaCl
a)Ca3(PO4)2
b)NaCl
c)No Precipitate Formed
d)Na3PO4
Answer:
I'm pretty sure the answer is A. Ca3(PO4)2.