Answer:
What????????????????????????????
Explanation:
???
Where are most algae found?
on the surface of lakes
growing on the ocean bottoms
floating on water world-wide
in forests around the world
Answer:
on the surface of lakes
Explanation:
Due tonight! Please help!
Please show your work and don’t spam or delete answers
I will mark Brainliest!
Calculate the concentration in grams per liter of a 450.0 mL solution containing
0.0762 moles of iodine gas (I2)
Answer:
42.98 g/L
Explanation:
What does climate change have to do with chemistry
Answer:
Well there are chemicals in the air like CO2 and nitrogen
Explanation:
These are chemicals and chemists deal with chemicals
1. What was the mass of a sample of water if the addition of 4280 joules raised the temperature of the sample from 22.00C to 34.50C?
2. What is the specific heat of a sample of an alloy if 3750 joules of heat are released when a 315 gram sample of alloy cools from 78.00C to 28.40C?
3. The specific heat of iron is 0.448 J/g0C. What will be the final temperature if 35000 joules of heat are added to a 454 gram sample of iron at 24.00C?
4. What will be the final temperature when 8750 joules are added to 75.0 grams of water at 23.00C?
5. When 38800 joules were added to a sample of iron, specific heat 0.448 J/g0C, the temperature rose from 24.5 deg C to 178 deg C. What was the mass of the iron sample?
Explanation:
Number 1
Q = 4280J
mass = x
∆∅ = 34.5 - 22
∆∅ = 12.5°C
Specific heat capacity of water = 4200J
Q = mc∆∅
4280 = x(4200)(12.5)
4280 = 52500x
x = 4280/52500
x = 0.0815kg
Number 2
c = x
Q = 3750
m = 315g
∆∅ = 78 - 28.4
∆∅ = 49.6°C
Q = mc∆∅
3750 = 315×x×49.6
3750 = 15624x
x = 3750/15624
x = 0.2400J(g°C)-¹
Number 3
c = 0.448
Q = 35000
m = 454g
∆∅ = x
Q = mc∆∅
35000 = 454(0.448)(x)
35000 = 203.392x
x = 35000/203.392
x = 172.0815
∅2 - ∅1 = ∆∅
∅2 = ∆∅ + ∅1
∅2 = 172.0815 + 24
∅2 = 196.0815
∅2 = 196°C
Number 4
Q = 8750J
m = 75g = 0.075
c = 4200J/kg/°C
∆∅ = x
Q = mc∆∅
8750 = 0.075(4200)∆∅
8750 = 315×x
x = 8750/315
x = 27.7778
∅2 - ∅1 = 27.7778
∅2 = 27.7778 + ∅1
∅2 = 27.7778 + 23
∅2 = 50.7778
∅2 = 50.8°C
Number 5
Q = 38800J
c = 0.448J/(g°C)
∆∅ = 178 - 24.5
∆∅ = 153.5°C
m = x
Q = mc∆∅
38800 = x × 0.448 × 153.5
38800 = 68.768x
x = 38800/68.768
x = 564.2159
x = 564g
Which Lewis electron-dot diagram represents an atom of a Group 13 element in the ground state?
Answer:
sodium chloride and lead (II) acetate
potassium sulfate and strontium iodide
chromium (III) nitrate and sodium phosphate
1. 2NaCl + Pb(CH3COO)2 → 2NaCH3COO + PbCl2
2. K2SO4 + SrI2 → KI + SrSO4
3. Cr(NO3)3 + Na3PO4 →CrPO4 + NaNO3
Explanation:
Please help me with this.
And show all work as well ASAP!!
Answer: The partial pressure of oxygen is 187 torr.
Explanation:
According to Raoult's law, the partial pressure of a component at a given temperature is equal to the mole fraction of that component multiplied by the total pressure.
[tex]p_1=x_1p_{total}[/tex]
where, x = mole fraction
[tex]p_{total}[/tex] = total pressure
[tex]x_{oxygen}=\frac{\text {moles of oxygen}}{\text {total moles}}[/tex],
[tex]x_{oxygen}=\frac{3.0}{12.33}=0.243[/tex],
[tex]p_{oxygen}=0.243\times 770torr=187torr[/tex]
Thus the partial pressure of oxygen is 187 torr.
Did the argon change state as you heated the atoms?
When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. Solids, liquids and gases all expand when heat is added. When heat leaves all substances, the molecules vibrate slower. So yes, it can if the heat is strong enough to change the objects compesistion! :)
Argon is a noble gas. It always exists in the form of gas. The boiling point of argon is very higher and thus we cant change its state, by simply heating.
What is argon ?Argon is 18th element in periodic table. It has 18 electrons and 18 protons. The mass number of argon is around 36 g/mol. Argon is included in the group 18 called the noble gases.
All the noble gases are highly stable and they are not reactive at normal conditions. They cant be easily form compounds or change their state by excitation or photochemical reaction.
Argon has higher melting point and boiling point. It cannot be easily transformed to another state by simply heating. But there occurs electron excitation, where the phase change cannot occurs.
Find more on argon:
https://brainly.com/question/133359
#SPJ3
4) Calculate the net force *
3 N
10-7= 3
the arrows are opposing each other.
Answer:
The net or resultant force depende on the direction we can easily understood the directions are opposite .Force is vector so if vectors are opposite we difference the two vectors.
10N-7N=3N
1.
is precipitation that reaches Earth's surface as frozen water
crystals.
(2 points)
Rain
Sleet
Snow
Hail
Are humans more similar to trees or bacteria? How do you know?(1 point)
A
Humans are more similar to bacteria because trees cannot move around their environment.
B
Humans are more similar to trees because bacteria are too small to see.
C
Humans are not similar to trees or bacteria. Humans are a special species that is not related to any other species on Earth.
D
Humans are more similar to trees because all plants and animals are part of the same domain.
Answer:
a
Explanation:
Answer:
Option D
Explanation:
A and B both make sense to some level.
For option A,trees can only move while bacteria and humans can both move and locomote so there's that similarity
For option B,humans and plants are not micro organisms but bacteria are so there's that similarity
Option C is just not true
Option D is the right answer thus both humans and animals are eukaryotes
A dogs ability to sit and roll over on command is an instinct. True or false
Answer:
100% false
Explanation:
instinct is something they are born knowing how to do and sitting and rolling over is something you have to train them to do:)
Maya made this picture to represent a chemical reaction:
Which of the following statements best explains the type of chemical reaction represented by Maya's picture?
1) It is neither a synthesis reaction nor a decomposition reaction because the total mass of the products is less than the total mass of the reactants.
2) It is neither a synthesis reaction nor a decomposition reaction because two reactants form two products.
3) It represents a synthesis reaction because the same atoms are present in the reactants and products.
4) It represents a decomposition reaction because two reactants break apart and form two products.
Answer:
2) It is neither a synthesis reaction nor a decomposition reaction because two reactants form two products.
Explanation:
This is not a synthesis reaction, which takes place when two or more reactants combine to form one product. This is a single replacement reaction, where the cation of an ionic compound "trades places" with another element that becomes the cation in a new ionic compound.
A bowler lifts her bowling ball a distance of 0.5 meters using 35 joules of energy. If, on Earth, a 1.0 kilogram mass weighs 9.8 newtons, the mass of the bowling ball used by this bowler is about;
Answer:17.5
Explanation: (0.5 meters)(35 Joules) =
When the bowler lifts the bowling ball for a distance of 0.5 m, the mass of the bowling ball used by the bowler is 17.3 kg.
What is Energy?The ability to do work is called Energy.
As work done and energy has the same units. The energy required is equal to the work done.
E = W = 35 J
Force acting on the ball is equal to the weight of the ball.
F = Weight =mg
where m = mass of the bowling ball and g = acceleration due to gravity
Substituting the given energy and distance moved, we have
[tex]35 = m\times9.81\times0.5\\ m=17.3 \:\rm kg[/tex]
Therefore, the mass of the bowling ball is 17.3 kg.
Learn more about energy
https://brainly.com/question/1932868
#SPJ2
Cyclopropene decomposes to propene when heated to 500 C, calculate rate constant for the first order reaction 0 min 1.48 mmol/L
Answer:
k = 0.0306 min-1
Explanation:
The table is given as;
Time, Concentration
0 1.48
5 1.27
10 0.98
15 0.84
The integrated rate law for a first order reaction is given as;
ln [A] = -kt + ln [Ao]
where;
[A] = Final Concentration
[Ao] = Initial Concentration
k = rate constant
t = time
In the table, taking the first two sets of values;
t = 5
k = ?
[Ao] = 1.48
[A] = 1.27
Inserting into the equation;
ln(1.27) = - k (5) + ln(1.48)
ln(1.27) - ln(1.48) = -5k
-0.1530 = -5k
k = -0.1530 / -5
k = 0.0306 min-1
how many Valance electrons does Bismuth have?
please help me. i'm doing a test
Answer:
5 valence electrons
Thus, bismuth would have 5 valence electrons
Explanation:
Hope it helps
Which of the following is NOT a representative particle?
molecule
atom
electron
Algae and other phytoplankton are the major producers of the earth's:
oxygen
carbon dioxide
hydrogen
nitrogen
Answer:
oxygen
Explanation:
pls mark me brainliest right
how many helium atoms are in a mole of helium?
Answer:1 mole of helium gas contains 6.02 x1023 helium atoms
Explanation:I hope this helps
When heating a liquid in a test tube, which of the following safety precautions should you take?
A.
Wear latex gloves.
B.
Heat the test tube on an open flame if possible.
C.
Put a tight lid on the test tube.
D.
Angle the test tube away from yourself and others.
Answer:
D
Explanation:
so that incase the liquid being heated splashes it doesn't land on anyone's skin
2. How would type of substance affect the rate of reaction?
Answer: IN terms of the collision theory, increasing the concentration of a reactant increases in the number of collisions between the reacting species per second and therefore increases the reaction rate.
Explanation: hope u get it right
Why is gold considered matter?
O A. Gold takes up space and has mass.
B. Gold can be used to make different products.
C. Gold is very valuable.
O D. Gold can be heated and cooled.
Answer:
A
Explanation:
Anything which takes up space and has mass is considered matter.
Please mark Brainliest if this was helpful!
I'll give brianliest if correct .
Answer:
the answer is decaying wood
What has to be equal on both sides of the chemical reaction in order for it to be balanced?
total number of molecules
sum of the subscripts
total number of atoms
sum of the coefficients
Answer:
total number of atoms
Explanation:
if you have 6 carbon atoms in reactants then you should have 6 carbon atoms in products.
6. An acidic solution of potassium dichromate is mixed with an aqueous solution of
hydrogen peroxide.
the rate of reaction would also increase if the temperature increases why
Answer:
An increase in temperature typically increases the rate of reaction. An increase in temperature will raise the average kinetic energy of the reactant molecules. Therefore, a greater proportion of molecules will have the minimum energy necessary for an effective collision (Figure.
Explanation:
Hope it helps
Which mutation in a fruit fly could be passed on to its offspring
Find the mass of 1.00 mol NaCl
Answer: One mol of NaCl (6.02 x1023 formulas) has a mass of 58.44 g.
To go from grams to moles, divide the grams by the molar mass. 600 g58.443 g/mol = 10.27 mol of NaCl.
HOPE THIS HELPS HAVE A AWESOME DAY❤️✨Explanation:
Please help! It’s due today. I’ll give brainliest
During a titration a student found that 20.0cm3 of sodium carbonate solution
neutralised 27.9 cm3 of 0.500 mol/dm3 nitric acid solution.
Calculate the concentration of the sodium carbonate solution in mol/dm3. Give
your answer to 3 significant figures.
Answer: The concentration of [tex]Na_2CO_3[/tex] required is [tex]0.349mol/dm^3[/tex]
Explanation:
According to the neutralization law,
[tex]n_1M_1V_1=n_2M_2V_2[/tex]
where,
[tex]n_1[/tex] = basicity of [tex]HNO_3[/tex] = 1
[tex]M_1[/tex] = molarity of [tex]HNO_3[/tex] solution = [tex]0.500 mol/dm^3[/tex]
[tex]V_1[/tex] = volume of [tex]HNO_3[/tex] solution = [tex]27.9cm^3[/tex]
[tex]n_2[/tex] = acidity of [tex]Na_2CO_3[/tex] = 2
[tex]M_1[/tex] = molarity of [tex]Na_2CO_3[/tex] solution =?
[tex]V_1[/tex] = volume of [tex]Na_2CO_3[/tex] solution = [tex]20.0cm^3[/tex]
Putting in the values we get:
[tex]1\times 0.500\times 27.9=2\times M_2\times 20.0[/tex]
[tex]M_2=0.349mol/dm^3[/tex]
Therefore, concentration of [tex]Na_2CO_3[/tex] required is [tex]0.349mol/dm^3[/tex]
Which type of prevailing wind would carry more water vapor (humidity)? (Choose one)
a. A global wind moving over the ocean
b. A global wind moving over land
Answer:
a. A global wind moving over the ocean
Explanation:
The surface water both north as well as
south of the equator do experience
upwelling. There is a rise of the nutrients to the surface . Ocean surface currents occur as a result of global wind as well as the shape of ocean basin and Coriolis effect