Answer:
Explanation:
2Ca + O₂ = 2CaO
80 g 32 g 112 g
given amount of Ca = 7.75 g
it will require oxygen = 32 x 7.75 / 80 = 3.1 g
but available oxygen = 2.44 so oxygen is the limiting reagent .
32g oxygen reacts with calcium to give 112 g of calcium oxide
2.44 gram of oxygen reacts with calcium to give 112 x 2.44 / 32 of CaO .
= 8.54 gram .
Theoretical yield of CaO = 8.54 gram.
1.What do you call the rate of doing work?
A. Energy
B. Time
C.Power
D. Work
2.What is the unit of power?
A. Joule
C. Newton
B. Second
D. Watt
3.How much power is required to lift a 30ON chair, as high as 0.20 in 2s?
A.1 W
C. 3 W
B. 7W
D. 15 W
4.How much power is required to raise a 30 kg crate with a vertical distance of 6m in a time of 4
Seconds?
A. 45 WV
C 52.5 W
B. 385 W
D. 441 W
5. A job is done slowly, and an iden tical job is done quickly. Both jobs require the same amount of_______
but different amounts of_________
A. energYy, work
B. work, energy
Choose the correct two words respectively.
C. power, work
D. work, power
6.What is work?
A. Force muitiplied by time
C. Force multiplied by distance
B. Force per unit of time
D. Force divided by distance
7.What is the unit of work?
A Joule
B. Second
C. Newton
D. Watt
8.Power can be increased by______
A. decreasing the force applied by an object.
B. decreasing the work done on the object
C.inereasing the time in which the work is done.
D. decreasing the time in which the work is done.
Please help
Answer:
1. c
2. d
3. c
4. d
5.
6. a
7. a
8.
I NEED AN ANSWER PLEASE!
A element is having atomic number 82. find the number of its protons and electrons
Answer:
the element is lead
Explanation:
the atomic number of lead is 82.
number of protons 82
number of electrons 82
Mass and energy are conserved
Question 16 options:
A)
only in chemical changes.
B)
in chemical changes and physical changes.
C)
always in physical changes and sometimes in chemical changes.
D)
only in physical changes.
Question 17 (5 points)
Which of the following can't be broken down any further chemically?
Question 17 options:
A)
Compounds
B)
Elements
C)
Matter
D)
Molecules
Question 18 (5 points)
A/an _______ is the smallest unit of matter that has the characteristics of a chemical element.
Question 18 options:
A)
atom
B)
proton
C)
molecule
D)
electron
Question 19 (5 points)
The distance between consecutive peaks or troughs in a wave is
Question 19 options:
A)
frequency.
B)
displacement.
C)
amplitude.
D)
wavelength.
Question 20 (5 points)
The phase transition of dry ice (frozen carbon dioxide) to gas is an example of
Question 20 options:
A)
condensation.
B)
sublimation.
C)
deposition.
D)
vaporization.
Explanation:
16 A. 17C matter 18C molecule 19D wavelength 20 C deposition
What are the four main types of tissues in the human body?
epithelial
dermal
vascular
connective
muscle
nervous
2. Using the following data, calculate the average atomic mass of magnesium (give your answer to the nearest
.01 ) : Show all work!
Isotope: Mg Percent abundance: 78.70%
24
Isotope: 'Mg Percent abundance: 10.13% 25
Isotope: Mg Percent abundance: 11.17% 26
Answer: 24.309amu
Explanation:
how many moles of methane are there in a 10g sample?
1 grams Methane is equal to 0.062334579609362 mole. Note that rounding errors may occur, so always check the results.
which type of matter is represented by the particle diagram
Answer:
a compound
Explanation:
How does energy (heat) flow in the ocean?
Answer:
There is a connection between the ocean and the atmosphere (they work together to move heat and fresh water across the globe) . Heat can be transferred between the surface of a sea or ocean and the atmosphere through ;
RadiationConvection,Turbulent heat exchange Evaporation of waterCondensation of water vapor above the sea or ocean .Explanation:
How are contact forces and non-contact forces similar?
Answer:
Difference between Contact and Non-Contact Forces
There is no field linked with the contact force. There is always a field linked with non-contact force. The frictional force is an example of a contact force. Gravitational force is an example of a non-contact force.
Explanation:
And it is physics not chem.
Hope this helps u
Crown me as brainliest:)
2.3 grams of sodium reacts with water and 0.080 grams of hydrogen has been collected what are the theoretical and percent yields of hydrogen gas?
Answer:
Theoretical yield = 0.1 g
Percent yield = 80%
Explanation:
Given data:
Mass of sodium = 2.3 g
Actual yield of hydrogen = 0.080 g
Theoretical yield = ?
Percent yield = ?
Solution:
Chemical equation:
2Na + 2H₂O → H₂ + 2NaOH
Number of moles of sodium:
Number of moles = mass/ molar mass
Number of moles = 2.3 g/ 23 g/mol
Number of moles = 0.1 mol
Now we will compare the moles of sodium with hydrogen to calculate the theoretical yield.
Na : H₂
2 : 1
0.1 : 1/2×0.1 = 0.05 mol
Mass of hydrogen produced:
Mass = number of moles × molar mass
Mass = 0.05 mol × 2 g/mol
Mass = 0.1 g
Percent yield of hydrogen:
Percent yield = actual yield / theoretical yield ×100
Percent yield = 0.08 g/ 0.1 g×100
Percent yield = 0.8×100
Percent yield = 80%
If Tracy were to put the pizza on the countertop to cool down, which temperature do you predict the pizza would get to?
a. -1 degrees Celsius
b. 10 degree Celsius
c. 27 degree Celsius
d. 93 degree Celsius
e. 260 degree Celsius
Answer:
d. 93 degree Celsius
Explanation:
Plzzzzzzzzzzzzzzzzzzzzzzz mark AS BRAINLIST
I need help with these 2 problems ASAP please.
This is not chemistry but i could not find science
(THIS QUESTION IS FOR SCIENCE)
Answer:
1. is sickle-cell anemia and 2. is phenyketonuria
Explanation:
Which reason best explains why metals are malleable?
A. because they have delocalized electrons
B. because they have localized electrons
C. because they have ionic bonds
D. because they have rigid bonds
Answer:
A
Explanation:
because they have delocalized electrons
Metals are malleable because they have delocalized electrons which are capable of forming ionic bonds.
What is an ionic bond?
Ionic bond or electrovalent bond is a type of bond which is formed between two elements when there is an exchange of electrons which takes place between the atoms resulting in the formation of ions.
When the atom looses an electron it develops a positive charge and forms an ion called the cation while the other atom gains the electron and develops a negative charge and forms an ion called the anion.
As the two atoms are oppositely charged they attract each other which results in the formation of a bond called the ionic bond.Compounds having ionic bonds are malleable and have high melting points.They are also brittle in nature.
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How many electrons are present in one neon
atom?
Answer: 10 electrons
That means there are 10 electrons in a neon atom. Looking at the picture, you can see there are two electrons in shell one and eight in shell two. Because shell two has eight electrons it is now full.
Explanation: Hopefully this helped!
12. (01.06 LC)
Which of the following is a property of a pure substance? (5 points)
It consists of different types of compounds.
It may have substances in different states of matter,
It is made up of a single element or type of compound,
Its components can be separated by employing physical methods.
Answer:
3rd one
Explanation:
dont have one, i think just think it makes most sense
Answer:It is made up of a single element or type of compound
Explanation: This answer is right because for something to be pure it has to only be made up of 1 thing.
Your advisor has given you a tube of GMP that has been sitting in the freezer for many years and wants to know the concentration. There is one problem: the spectrophotometer in the lab has been 'optimized' for use with proteins and only measures at 280 nm. You decide to give it a try. After getting and absorbance reading of 0.2, what is the concentration of GMP in the tube (assuming a 1 cm path length).
Answer:
2.22 × 10^-5M
Explanation:
From Beer-Lambert's law;
A=εcl
Where A = absorbance of GMP= 0.2
ε= molar extinction coefficient of GMP = 9000 M-1cm-1
c= concentration of GMP= the unknown
l= path length = 1 cm
c= A/εl = 0.2/ 9000 M-1cm-1 × 1 cm
c= 2.22 × 10^-5M
Which statement describes all chemical changes, but not all physical changes?
Answer:
A new substance forms.
Explanation:
Answer:
B
Explanation:
What is the solution to the equation below, rounded to the correct number of Significant figures? 4700 L - 281.4 L = ___ L
Answer:
46
Explanation:
Answer: 4418.6
Explanation:
1. What is the mass of a rock that has a density of 2.5 grams per cubic centimeter and a volume of 4.0
cubic centimeters?
What is the mass
Answer:
Explanation:
d =
m
V
m = d×V
V =
m
d
DENSITY
Density is defined as mass per unit volume.
d =
m
V
Example:
A brick of salt measuring 10.0 cm x 10.0 cm x 2.00 cm has a mass of 433 g. What is its density?
Step 1: Calculate the volume
V = lwh = 10.0 cm × 10.0 cm × 2.00 cm = 200 cm³
Step 2: Calculate the density
d =
m
V
=
433
g
200
c
m
³
= 2.16 g/cm³
MASS
d =
m
V
We can rearrange this to get the expression for the mass.
m = d×V
Example:
If 500 mL of a liquid has a density of 1.11 g/mL, what is its mass?
m = d×V = 500 mL ×
1.11
g
1
m
L
= 555 g
VOLUME
d =
m
V
We can rearrange this to get the expression for the volume.
V =
m
d
Example:
What is the volume of a bar of gold that has a mass of 14.83 kg. The density of gold is 19.32 g/cm³.
Step 1: Convert kilograms to grams.
14.83 kg ×
1000
g
1
k
g
= 14 830 g
Step 2: Calculate the volume.
V =
m
d
= 14 830 g ×
1
c
m
³
19.32
g
= 767.6 cm³
The mass of rock is 10 g.
We have sample of rock.
We have to determine its mass.
How is density and mass of body related ?The density and mass of body are related as follows -
D = M / V
where -
V - volume of the body.
M - mass of the body.
D - density of the body.
According to the question →
Using the formula discussed above -
D = M / V
M = D x V
M = 2.5 x 4 = 10 g
Hence, the mass of rock is 10 g
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Give an example of experimental bias
Answer:
chongus because he's the only good one
Sanjay is learning about the elements that make up Earth’s crust. Ms. Richards, his Earth science teacher, gives him an element and asks him to determine which element from Earth’s crust it is. She also provides Sanjay with this table. Sanjay weighs the element and finds that it has a mass of 17.98 g. By placing the element in water, he determines the volume of the substance to be 2.2835 mL.
Based on the table from Ms. Richards, what element from Earth’s crust did Ms. Richards gave to Sanjay?
A) iron
B) calcium
C) aluminum
D) silicon
Answer:
Iron
Hope this helps! Stay safe!
(Plz vote me as brainliest)
Answer:iron
Explanation:
Which is the larger atom kr Or As
Answer:
I think As is larger
Explanation:
within a balloon there are 3 types of gases. the first gas, A, is 6.0 grams in amount, the second gas, B, is 4.0 grams and the last, C, is 3.5 grams. The molar mass of gas "A" is 13.56 g/mol, "B" is 11.76 g/mol and "C" is 12.07 g/mol. If the total pressure inside the balloon is 15 atm, what is the partial pressure of each gas?
Answer:
Partial pressure of Gas A = 3.91 atm
Partial pressure of Gas B = 5.10 atm
Partial pressure of Gas C = 5.99 atm
Explanation:
Number of moles of gas A;
n_A = 13.56 g/mol ÷ 6 g = 2.25 moles
Number of moles of gas B;
n_B = 11.76 g/mol ÷ 4 g
n_B = 2.94 moles
Number of moles of gas C;
n_C = 12.07 g/mole ÷ 3.5 moles
n_C = 3.45 moles
Total number of moles = n_A + n_B + n_C = 2.25 + 2.94 + 3.45 = 8.64 moles
Mole fraction of gas A; X_a = 2.25/8.64
Mole fraction of gas B;X_b = 2.94/8.64
Mole fraction of gas C;X_c = 3.45/8.64
Now, partial pressure of each gas will be;
Mole fraction × Total pressure
We are given total pressure of 15 atm.
Thus;
P_a = (2.25/8.64) × 15
P_a = 3.91 atm
P_b = (2.94/8.64) × 15
P_b = 5.10 atm
P_c = (3.45/8.64) × 15
P_c = 5.99 atm
Thus;
Partial pressure of Gas A = 3.91 atm
Partial pressure of Gas B = 5.10 atm
Partial pressure of Gas C = 5.99 atm
Which part of a flower can make eggs
Answer:Within the flower, sperm cells are produced by pollen at the tips of stamens, while egg cells develop in ovules, tiny structures embedded in the ovary at the base of the pistil.
I didn't realize the person up top had the same answer give them the brainliest! :)
ASAP. I will give brainlies to right answer!!! Three grams of the same substance in different phases are stored in three different containers. Each container is barely large enough to hold the substance.
Which statement can be known about the behavior of the atoms in each container?
The atoms in the solid would be moving vigorously around the container.
The atoms in the liquid would be vibrating in position.
The atoms in the solid would be vibrating in position.
The atoms in the gas would be moving slowly around the container.
Answer:
The atoms in the solid would be vibrating in position.
Explanation:
i took the test
Three grams of the same substance in different phases are stored in three different containers. Each container is barely large enough to hold the substance. Therefore, the correct option is option B.
What is atom?Atom, the smallest unit of matter that may be separated without releasing electrically charged particles. It is also the tiniest unit of matter with the characteristics of a chemical substance. As a result, the atomic is the fundamental building component of chemistry.
The majority of the molecule is empty space. The rest of the structure is made up of a positive-charged nucleus of neutrons and protons surrounding by a swarm of negative-charged electrons. In comparison to electrons, the lightest charge particles in nature, nuclear nucleus is small yet dense. The atoms in the liquid would be vibrating in position.
Therefore, the correct option is option B.
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A substance is examined under a high-power electron microscope. The substance is found to contain only one type of atom.
What is the substance?
compound
O element
mixture
solution
Answer:
It is a solution
Explanation:
I know that because a solution is something you mix and you have to use a microscope if you really wanna see what's in there
An enzyme can catalyze a reaction with either of two substrates, S1 or S2. The Km for S1 was found to be 2.0 mM, and the Km, for S2 was found to be 20 mM. A student determined that the Vmax was the same for the two substrates. Unfortunately, he lost the page of his notebook and needed to know the value of Vmax. He carried out two reactions: one with 0.1 mM S1, the other with 0.1 mM S2. Unfortunately, he forgot to label which reaction tube contained which substrate. Determine the value of Vmax from the results he obtained:
Tube number: 1
Rate of formation of product:0.5
Tube number: 2
Rate of formation of product: 4.8
Answer:
100.5 ≈ 101
Explanation:
Km for S1 = 2.0 mM
Km for S2 = 20 mM
Given that : S1 = S2 = hence Vmax for either S1 or S2 can represent
The Vmax can be calculated using the data Given and equation below
Vo = Vmax [s] / ( Km + [s] ) ------ (1)
Vo = 0.5
[s] = 0.1 mM
km = 20 mM
making Vmax subject of equation 1
Vmax = 0.5 ( 20.1 mM) / (0.1 mM )
= 100.5 ≈ 101
Is crumbling sheet of paper physical or chemical change and why! Pls help fast!!!! :((
Answer:
Chemical
Explanation:
physical, because chemicl would be if it was disolving with water
What type of bond is present between Magnesium and Fluoride in MgF2?
Answer: Ionic Bond
Explanation:
Ionic compounds are created by bonding a metal and non-metal
Mg is a metal
Fluoride is a non-metal
What type of reaction heats the water to generate steam in a nuclear power plant