Answer:
desert
Explanation:
rainforest include a lot of rain, and grasslands have grass. grass includes water and sunlight. which leaves you to desert
What is the speed of a bird that flies 25 meters in 25 minutes?
Answer:
1mpm(1 meters per minute) Explanation: Speed:Distance/time 25/25=1 plz mark as brainliest
Answer:
1mpm(1 meters per minute)
A sample of oxygen gas occupies a volume of 229.5 mL at 762.7 torr pressure. What volume in mL will it occupy at 704.5 torr pressure?
Answer:
248.4 mL
Explanation:
In order to answer this problem we can use Boyle's law, which states that at a constant composition:
P₁V₁ = P₂V₂Where in this case:
P₁ = 762.7 torrV₁ = 229.5 mLP₂ = 704.5 torrV₂ = ?We input the data:
762.7 torr * 229.5 mL = 704.5 torr * V₂And solve for V₂:
V₂ = 248.4 mLA sample of an unknown liquid has a volume of 12.0 mL and a mass of 6 g. What is its density?
A. 2 g/cm3
B. 0.5 g/cm
C. 5.0 g/cm3
D. 0.2 g/cm3
[tex]\large \mathfrak{Solution : }[/tex]
volume = 12 ml = 0.012 litres = 0.012 cm³
mass = 6 g
And the relationship between mass, volume and density can be depicted by :
[tex] \boxed{density = \dfrac{mass}{volume} }[/tex][tex]density = \dfrac{6}{0.012} [/tex][tex]density = \dfrac{6000}{12} [/tex][tex]density = 500 \: \: g/cm {}^{3} [/tex]therefore, density = 500 g/cm³
If 190dm of hydrogen gas collected at 20°c and 760mmHg .Calculate it's volume at stp (standard pressure=760mmHg
Answer:
177.1 L
Explanation:
The excersise can be solved, by the Ideal Gases Law.
P . V = n . R . T
In first step we need to determine the moles of gas:
We convert T° from, C° to K → 20°C + 273 = 293K
We convert P from mmHg to atm → 760 mmHg = 1atm
1Dm³ = 1L → 190L
We replace: 190 L . 1 atm = n . 0.082 . 293K
(190L.atm) / 0.082 . 293K = 7.91 moles.
We replace equation at STP conditions (1 atm and 273K)
V = (n . R .T) / P
V = (7.91 mol . 0.082 . 273K) / 1atm = 177.1 L
We can also make a rule of three:
At STP conditions 1 mol of gas occupies 22.4L
Then, 7.91 moles will be contained at (7.91 . 22.4) /1 = 177.1L
What is the atomic number of an atom? Why is this number important?
For a solution, [H+] = 1 x 10-2M.
What is the pH?
Answer:
pH=2
Explanation:
-log(1 x 10-2)=2
Which option correctly orders the elements by increasing reactivity?
Hint: Review your periodic table.
Na < Li < K
Na < Li < K, ,
K < Na < Li
K < Na < Li, ,
Li < Na < K
Li < Na < K, ,
Na < K < Li
Answer: Li < Na < K is the answer
Explanation:
21.82 L of 4.65 M HCl is added to 9.31 L of 8.55 M NaOH. What is the concentration of HCl in the resulting solution? **hint: make ICE table
A)1.90 M
B)0.952 M
C)10.3 M
D)0.702 M
E)0.644 M
Answer:
D
Explanation:
First you multiply 4.65 with 21.82 to get the mols of hcl, which is 101.463. Then you make an ice table. The ice table should look like this:
HCl + NaOH = 12NaCl + H2O
101.463 6.022e23 1.989e30
As the ice table above shows, you will have 1.989e30 mols of nacl after the reaction. With that information, you can then divide it by 2.833333333333333e30 to get 0.702 M.
What is the percent composition (by mass) of MgBr2?
Answer:
13.2% Mg, 86.8% Br
Explanation:
Mg has a molar mass of 24.31g/mol.
Bromine has a molar mass of 79.90 g/mol.
There is one mole of Mg and two moles of Br in the compound:
79.90x2 + 24.31 = 184.11
So the total molar mass of MgBr2 is 184.11.
A percent tells us a part of a whole, so we will divide each part of the mass into the whole mass.
24.31g Mg / 184.11g MgBr2 = .132
159.8g Br / 184.11g MgBr2 = .868
Multiply these decimals by 100 to make them into a percent.
.132 x 100 = 13.2% Mg
.868 x 100 = 86.8% Br
Plants and animals both use the process of _____ to release stored energy.
Answer:
The sun.
Explanation:
Sun is the ultimate source of energy. All living things on the earth using the energy comes from the sunlight.
Plants using sunlight to fuel the process of photosynthesis. Photosynthesis is the process of transforming of water and carbon dioxide to oxygen and glucose. The amount of energy used to drive the photosynthesis process is stored in the glucose molecules.
Organism feed on plants and breaking down the glucose molecules to release the stored energy. The release energy is utilized by the cells present in the organisms.
Autotrophs also have the ability to make their own food, so they are also using the energy from the sun to make their food.
10 moles of potassium hydroxide in 5.16 L of solution
Answer:
The molarity is 8.52M
Explanation:
molality = moles of solute/kg of solvent = 5.2mol/kg
moles of solute = 5.2mole
mass of solute = moles of solute × MW = 5.2 × 56.106 = 291.8g
mass of solvent = 1kg = 1000g
Mass of solution = mass of solute + mass of solvent = 291.8g + 1000g = 1291.8g
Density of KOH = 2120g/L
Volume of solution = mass/density = 1291.8/2120 = 0.61L
Molarity = number of moles of solute/volume of solution = 5.2/0.61 = 8.52M
The concentration in the solution is 1.94 mol/L
From the question,
We are to determine the concentration of 10 moles of potassium hydroxide in 5.16 L of solution.
From the formula
Number of moles = Concentration × Volume
Then, we can write that
[tex]Concentration = \frac{Number\ of\ moles}{Volume}[/tex]
From the question,
Number of moles of potassium hydroxide (KOH) = 10 moles
Volume of solution = 5.16 L
∴ Concentration of the solution = [tex]\frac{10}{5.16}[/tex]
Concentration of the solution = 1.94 mol/L
Hence, the concentration in the solution is 1.94 mol/L
Learn more here: https://brainly.com/question/19196652
Here is the complete question:
Calculate the concentration in each of the following solutions:
1. 10 moles of potassium hydroxide in 5.16 L of solution
PLEASE ANSWER QUICKLY
Which are characteristics of arthropods? Check all that apply.
radial symmetry
nervous system
asexual reproduction
segmented body
open circulatory system
Answer: I say its Segmented body and radial symmetry im not sure if it is right
Explanation:
Answer:
B. Nervous system
D. Segmented body
E. Open circulatory system
Explanation:
Hope this helps!
Have a nice dayy! :)
Which is NOT an application of chemistry to life? *
a. Fertilizers used by farmers
b. Soaps used to clean
c. Medicine used by doctors
d. Hammer used by construction worker
CAN SOMEONE PLEASE HELP ME ??!!!!!!
Our garbage disposal techniques have changed over time. Describe two ways that a “garbage dump” from the past would differ from a more modern sanitary landfill site
Answer:
The Resource Conservation and Recovery Act (RCRA; PL 94-580), the major federal law on waste disposal, was passed in 1976. Its primary goal was to "protect human health and the environment from the potential hazards of waste disposal." RCRA is also concerned with reducing the amount of waste generated, ensuring that wastes are managed properly, and conserving natural resources and energy. The RCRA regulates solid waste, hazardous waste, and underground storage tanks
Explanation:
A solute can be obtained from a solution by...
Answer:
Evaporating the solvent
Explanation:
Ayúdenme por favor
Please help me
I need help no links please
Answer:
A. We still feel gravity because of inertia, which occurs all around us. Gravity is not felt as much because although it feels small, gravity is the attraction that keeps objects on Earth.
B. This is due to a field and a law, which states that opposites attract and like repel.
Find the final product for: Li + Br and show work.
Lithium is atomic number 3, so it has valency 1
While, Bromine is atomic number 35, and has valency 1
Lithium has an extra electron while Bromine need an electron, since they both need and have one electron, the form
LiBr (Lithium Bromide) where Li is +ve charged and Br is -ve charged
Happy to help :)
HELP PLZ ILL GIVE BRAINLIEST
science:my chosen place is bonifacio global city
i choose this place because?
Answer:
Rewrite the following sentence in reported speech
The chair person said,"A hearty welcome to all present!"
I need help!
And please give me an ACTUAL answer and not random spam words please!
Thanks!
What is[OH-] of a solution
with a pH of 11.3?
Answer in M
Answer:
2 ×10^-3
Explanation:
pH + pOH = 14
pOH = 14-11.3 = 2.7
[OH-] = 10^-pOH = 10^-2.7 = 2×10^-3 M
What processes contribute water to surface water sources?(science)
To begin, check that Reaction 1 and Forward are selected. In this reaction, hydrogen (H2) and oxygen (O2) react to form water (H2O). The reaction takes place inside a device called a calorimeter. Inside the calorimeter, a small chamber holds the reactants. The rest of the calorimeter is filled with water. Click Play (). What happens?
Answer:
The reaction occurs and all H2 and O2 unite to form H20
Help plzzZZZZ I really need help with this
What is defined as the plants and animals and the physical surroundings, including the sun, air, soil, and water?
Answer:
Ecosystem
Explanation:
The answer is ecosystem because the ecosystem includes the community such as living things and the enviornment of nonliving things such as the sun!
Answer:
ecosystem I'm pretty sure
live in a variety of places (with oxygen, without oxygen, extreme
hot, extreme cold). *
A bacteria
B virus
C fungus
D parasite
Answer:
A Bacteria
Explanation:
ASAP EASYYYY!!!!!!!!
List three household products that should go to a secure landfill site instead of regular sanitary landfill.
Answer:
A 0.60 mol sample of PCl 3 (g) and a 0.70 mol sample of Cl 2 (g) are placed in a previously evacuated 1.0 L container, and the reaction represented
Explanation:
5 Protons {+}
5 Electrons {-}
6 Neutrons {0}
What element is this ?
Answer:boron
Explanation:
What is one way that the kidneys help maintain homeostasis in the body?
A They regulate the temperature of the body
B They regulate the distribution of energy in the body
C They regulate the amount of oxygen in the body
D They regulate the amount of water in the body
Answer:
they regulate the amount of water in the body.
Explanation:
The kidneys help maintain homeostasis by regulating the concentration and volume of body fluids. For example, the amount of H+ and HCO3 - secreted by the kidneys controls the body's pH.
Your friend sits on a 25.0L exercise ball, squishing the ball so that it is only 17.5L. What is the pressure inside the ball if the outside air pressure is 100. kPa?
Use the Boyle's Law equation to determine the answer.
Answer:
b
Explanation: because i took the test and got a 100