Answer:
it is a chemical change because it can't be change back to it normal position when it gets burnt
How do you determine the Ka of an unknown acid using a titration curve?
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
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A 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
_______ is determined by the energy of the disturbance
that causes the wave.
Answer:
wave amplitude is the answer
What is the empirical formula of a compound with a percent composition of 22.5% Phosphorous and 77.5% Chlorine?
Answer:
[tex]\boxed {\boxed {\sf PCl_3}}[/tex]
Explanation:
We are given the percent composition: 22.5% phosphorus and 77.5% chlorine.
We can assume there are 100 grams of this compound. We choose 100 because we can simply use the percentages as the masses.
22.5 g P 77.5 g ClNext, convert these masses to moles, using the molar masses found on the Periodic Table.
P: 30.974 g/mol Cl: 35.45 g/molUse the molar masses as ratios and multiply by the number of grams. [tex]22.5 \ g \ P * \frac {1 \ mol \ P }{30.974 \ g \ P}= \frac {22.5 \ mol \ P }{ 30.974} = 0.7264157035 \ mol \ P[/tex]
[tex]77.5 \ g \ Cl * \frac {1 \ mol \ Cl }{35.45 \ g \ Cl}= \frac {77.5 \ mol \ Cl }{ 35.45} \ =2.186177715 \ mol \ Cl[/tex]
Divide both of the moles by the smallest number of moles to find the mole ratio.
[tex]\frac {0.7264157035} {0.7264157035} = 1[/tex]
[tex]\frac {2.186177715}{0.7264157035}=3.009540824 \approx 3[/tex]
The mole ratio is about 1 P: 3 Cl, so the empirical formula is written as: PCl₃
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
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
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 mLBased on what you have learned about the units for measuring thermal energy, complete the following passage.
The unit often used in chemistry and physics to measure energy, such as for work or electrical current, is the
. We can also use this unit, as we did in this lab, for measuring
. This is a property that is quantified by the energy needed per
of material to raise the temperature by one
. The unit for this measure is therefore
.
Answer:
1.joule 2.specific heat 3.gram 4.degree Celsius 5.J/g°CExplanation:
I did the lab
Thermal energy is represented in the units joules J. It is the energy needed to raise the temperature by one degree celsius.Per gram this energy is called as specific heat capacity with the unit J/°Cmol.
What is heat capacity?Heat capacity of a substance is the heat energy required to raise the temperature of the substance by one degree celsius.
If the heat capacity is measure per one mole of a substance it is called specific heat capacity. It is an intensive property whereas heat capacity is an extensive property.
The given passage can be completed as follows:
The unit often used in chemistry and physics to measure energy, such as for work or electrical current, is Joule (J). We can also use this unit, as we did in this lab, for measuring heat capacity.
This is a property that is quantified by the energy needed per one gram of material to raise the temperature by one degree celsius.The unit for this measure is therefore J/°Cg.
To find more about heat capacity, refer the link below:
https://brainly.com/question/28921175
#SPJ2
Please answer grade 6th
Answer:
The last one
Explanation:
I have done this before
Answer:
Earth's plates moving & colliding against one another.
HELP PLZ ILL GIVE BRAINLIEST
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:
How many moles of ammonia, NH3, are in 51 grams of NH3?
Answer:
grams NH3 is equal to 0.058718113128665 mole.
Explanation:
Answer:
3 moles
Explanation:
Use the mole = mass/mr equation
so, mole = 51/17 = 3 moles
What is the atomic number of an atom? Why is this number important?
the process plants use to make sugar for food
A respiration
B eqidermis tissue
C photosynothedis
D chlorophyll
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
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! :)
Heyy,
I hope that you're doing well today! :)
Can you help me please with my chemistry homework?
How are these two formulas called?
Thank youu
These are structural formulas of constitutional isomers of hexene, an alkene.
Both are acyclic, six-carbon chains, and they differ only in the position of the double bond. As constitutional isomers, both structures have the same molecular formula.
The first structure is of hex-1-ene (or 1-hexene).
The second structure is of (3E)-hex-3-ene [or (3E)-3-hexene].
Both structures have the molecular formula C₆H₁₂.
I hope I answered your question. Please feel free to let me know otherwise.
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
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.
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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:
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)
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
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.
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:
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.
Which compounds represent the
product(s) in the equation?
C3H8 + 5O2 ==> 4H2O + 3CO2
1.C3H8
2.502
3.Only 4H20
4.Both 4H20 and 3C02
Answer:
Both
compounds in left hand side of the equation is called reactants.
compounds in right hand side of the equation is called products.
so ans is both water and carbon di oxide
Explanation:
Carbon dioxide and oxygen are both ___ found in the air.
Answer:
gases
Explanation:
Answer:
the Carbondioxed and oxygen are both a gass found in the air