Answer:
D. plastic[tex]\tt{ \green{P} \orange{s} \red{y} \blue{x} \pink{c} \purple{h} \green{i} e}[/tex]
A ball hits a wall. What is true about the magnitude of the force experienced by the ball compared with the force experienced by the wall?
ОА.
The ball experiences more force than the wall.
OB. The ball experiences less force than the wall.
O c.
The ball and the wall experience the same force.
OD
The ball experiences half the force of the wall.
Someone plz help me :(
Answer:
b. the development of new vaccine prevents disease from spreading
The radioactive elements used in nuclear
power plants are plutonium and
A thoriun B. tritium C. radon
D. radium E. uranium
Match the parts of the skeletal system with its level of organization.
1. Thigh bone
2. living cell
3. Bones cells working together
4. All the bones, cartilage, and ligaments
To:
A. Organ system
B. Organ
C. Tissue
D. Cell
Hi, these are the answers:-
Thigh bone → Organ
Living cell → Cell
Bone cells working together→ Tissue
All the bones, cartilages and ligaments→ Organ System
Hope it helps you...
Pls mark brainliest if it helps you...
(Answered by Benjemin)
3. When baking soda (sodium bicarbonate or sodium hydrogen carbonate, NaHCO3) is heated, it
releases carbon dioxide gas, which is responsible for the rising of cookies, donuts, and bread.
a. Write a balanced equation for the decomposition of the compound (one of the products
is Na2CO3).
b. Calculate the mass of NaHCO3 required to produce 20.5 g of CO2
Explanation:
just trying.....hope that helps
While camping, you make a snack over a campfire. You roast a marshmallow over the campfire until it is browned and put it between some chocolate and graham crackers. When you take a bite, you notice that the chocolate and marshmallow have melted slightly. Which statement correctly identifies a part of this process as a physical or a chemical change?
Answer:
It is melting which is a physical change.
Explanation:
[tex].[/tex]
The process is a physical change because the chocolate and marshmallow melted.
You included no options but this is a physical change because the question mentioned that the chocolate melted.
A physical change occurs when the state of matter changes but the chemical properties remain the same. Physical changes include:
Melting because only the state changes from solid to liquid Freezing because only the state changes from liquid to solidIn conclusion therefore, the chocolate and marshmallow melted and so underwent a physical change.
Find out more at https://brainly.com/question/17931044.
Write the reaction to prepare C2H5Br from (image attached)
a) alcohol using PX3
b) Alcohol using HX
The equations for the preparation of C₂H₅Br from alcohol using PX₃ and HX are shown in the attachment below.
a) Preparation of C₂H₅Br from alcohol using PX₃
In PX₃, X refers to the halides (F, Cl, Br etc.). Since the desired ethyl halide is ethyl bromide (C₂H₅Br) , then X in PX₃ will be Br. Therefore, PBr₃ will be used in the reaction as shown in the attachment below.
b) Preparation of C₂H₅Br from alcohol using HX
Also, In HX, X refers to the halides (F, Cl, Br etc.). Since the desired ethyl halide is ethyl bromide (C₂H₅Br), then X in HX will be Br. Therefore, HBr will be used in the reaction as shown in the attachment below.
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Use mathematical models, in the form of sketches, example problems, or calculations, to illustrate why density is a quantity that does not depend on the size of the sample tested.
Density, which is the mass per unit volume, is a constant for a material, and does not depend on the size of the sample tested
[tex]Density = \mathbf{\dfrac{m}{v}} = \rho = \mathbf{Constant \ for \ the \ material}[/tex]
The steps taken to arrive at the above statement are as follows:
The density of a substance is its mass per unit volume. Mathematically, density can be expressed as follows;
[tex]Density = \mathbf{\dfrac{Mass}{Volume}}[/tex]
Let m₁ represent the mass and let v₁ represent the volume, of an object. Let m₂ represent the mass of double the the object, so that we have;
m₂ = 2 × m₁
The volume of m₂, v₂ = 2 × v₁
The ratio of the difference in the change in mass to the change in volume between the samples, m₁ and m₂, is given as follows;
[tex]\dfrac{\Delta m}{\Delta v} = \dfrac{m_2 - m_1}{v_2 - v_1} = \dfrac{2 \times m_1 - m_1}{2 \times v_1 - v_1} = \dfrac{m_1}{v_1} = \rho_1[/tex]
Therefore as Δv = v₂ - v₁ approaches zero, that is as the mass m₁ approaches m₂, we have;
[tex]\lim \limits_{\Delta v \to 0} \dfrac{\Delta m}{\Delta v} =\mathbf{ \dfrac{dm}{dv}}[/tex]
Which gives;
[tex]\mathbf{\lim \limits_{\Delta v \to 0} \dfrac{\Delta m}{\Delta v} } = \dfrac{dm}{dv} = \mathbf{\dfrac{Mass \ of \, sample}{Volume \ of \, sample}} = \mathbf{Density, \ \rho}[/tex]
Therefore, the rate of change of mass to volume of a sample to the volume of the sample is constant which gives that the mass of a sample is directly proportional to the volume of the sample and the ratio of the mass of the sample to the volume of the sample is a constant equal to the density of the substance
Which gives that the density of a substance which is the mass/volume is constant for all masses of the substance and does not depend on the size of the sample tested
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Please help due at 11:00
Pls helllllpppppp!!!!!
how was the interior of the atom was experimentally dicovered?
Answer:
Thomson's experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons. Thomson's plum pudding model of the atom had negatively-charged electrons embedded within a positively-charged "soup."
First one to answer will be marked as brainliast
If 180 grams of sugar can be dissolve in 100 milliliters of water to make a saturated solution of sugar at room temperature, how much sugar is needed to make a saturated solution of sugar in 250 ml of water, if it already contains 200 grams of sugar dissolved as an unsaturated solution
Answer:
130 gram
Explanation:
first subtract 180 to 100
then the answer is 80
now add 80 to 250
the answer is 330
lastly subtract 330 with 250
the final answer is 130
You are given 2 balls that are made of the same material. They are also the same size and color. One is hollow and one is solid. Determine the physical property that could be used to identify the ball as a solid.
Group of answer choices
boiling point
solubility
pH
density
Answer:density
Explanation:
it’s how’s how dens the ball is
Dante loves taking care of the chickens on his farm. He feeds them rice everyday. His Grandma told him that he should feed them corn everyday instead of rice because it will make them grow fatter.
He decides to do an experiment to test what type of food will make his chickens fatter. Before the experiment, the chickens weigh an average of 5 pounds. David makes two groups of chickens. He feeds Group A rice everyday, and feeds Group B corn everyday. After one month, David weighs the chickens to see if they gained any weight. Group A weighs an average of 5 pounds and group B weighs an average of 7 pounds. What is the test variable (independent variable) in this experiment? *
Answer:
The independent variable in this experiment is what he feeds the chickens (rice or corn).
Explanation:
The independent variable is the variable the experimenter manipulates or changes.
Scientific Notation: Which of the following is equivalent to 2.98 x 10^-7
A. .000000298
B. 20.86
C. 2086
D. 29,800,000
Answer: A
Explanation: 10^-7 means that the decimal point is 7 digits to the left (the "-" sign) of the 2. Move the decimal point left seven times, putting a "0" for each step. and then place the decimal point. A "0" is added to the left of the decimal point for clarity.
2.98x10^-7
1st) 0.298x10^-6
2nd) 0.0298x10^-5
etc, for 7 times
0.000000298
The scientific notation for 2.98 x 10^-7 will be .000000298. The correct option is A.
What is scientific notation?Scientific notation is a method of writing extremely large or extremely small numbers.
When a quantity between 1 and 10 is multiplied by a power of 10, it is written in scientific notation.
The proper scientific notation format is a x 10^b, where an is a number or decimal number with an absolute value greater or equal one and less than ten.
The b is the power of ten required for scientific notation to be mathematically equivalent to the original number.
A positive exponent indicates that the decimal point has been moved that many places to the right.
A negative exponent indicates that the decimal point has been shifted that many places to the left.
As in the given number, 2.98 x 10^-7 the exponent is negative so the decimal will shift seven times to left of the digit making it .000000298.
Thus, the correct option is A.
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How can using the science method help other ?
Answer: Using the science method helps other because It helps you put together experiments, and use data to find conclusions and interpret them.
Explanation: Hope this helps!
12. A year on any planet is the number of days it takes for the planet to complete
one orbit around the Sun. It takes 365 days for Earth. It takes 365 days for the
Earth to revolve around the Sun, so on Earth a year is 365 days. How old are
you in Mars-years?
Step 1: Calculate how many Earth days old you are.
Step 2: Divide that number the number of days it takes Mars to complete an orbit.
Step 3: Explain your answer
Answer: Well, 365 days is about how long it takes for Earth to orbit all the way around the Sun one time. It's not exactly this simple though. An Earth year is actually about 365 days, plus approximately 6 hours.
A rectangular object measures 3 cm x 2 cm x 1 cm and it has a mass of 4 g. What is the density of
this rectangular object?
Answer:
Density of the rectangular object = 4 / 6 = 0.67g/cm³
Explanation:
First find the volume of the rectangular object.
Volume of the rectangular object = 3 x 2 x 1 = 6cm³.
Density of an object = mass of the object / volume of the object
Therefore,
Density of the rectangular object = 4 / 6 = 0.67g/cm³
what are elements?????
An element is a substance that cannot be broken down into any other substance.
I hope this answer helps you..
someone help this is confusing lol. ILL BRIANLIST!
Answer:
A spider
B termite
C 2nd
D grassy environment
E the clams will grow in numbers
Explanation:
Answer:a- spider b-lizard c- the second one (II) d- you can literally find it in your backyard or a field e- the number of clams will increase
Explanation:
what would be the atomic mass of Carbon-14
what is a big plants
In the world
who can say
I want a answer
Answer:
Jupiter
Explanation:
Fifth in line from the sun, Jupiter is, by far, the largest planet in the solar system.
Atoms are bonded together due to the mixing of atomic orbitals to create mixed or hybrid orbitals. This is an example of a(n)?
a. problem
b. law
c. theory
d. experiment
a kilogram of lead occupies a much smaller volume than a kilogram of water, because_____ has a much higher density
Answer:
lead
Explanation:
As we know the formula
[tex]\boxed{\sf Density=\dfrac{Mass}{Volume}}[/tex]
[tex]\\ \sf\longmapsto Volume=\dfrac{Mass}{Density}[/tex]
Hence object having less density occupy higher volumeQ. Calculate the number of atoms in each of the following (i) 52 moles of Ar (ii) 52 u of He (iii) 52 g of He
The number of atoms will be 3.131 x [tex]10^{25}[/tex], 7.8286 x [tex]10^{24[/tex], and 7.8286 x [tex]10^{24[/tex] atoms respectively.
Number of atomsThere are 6.022 x [tex]10^{23}[/tex] atoms in 1 mole of every substance.
52 moles of Ar will contain 52 x 6.022 x [tex]10^{23}[/tex] = 3.131 x [tex]10^{25}[/tex] atoms
52 u of He = 52/4 = 13 moles of He.
13 moles of he = 13 x 6.022 x [tex]10^{23}[/tex] = 7.8286 x [tex]10^{24[/tex] atoms
52 g of He = 52/4 = 13 moles of He.
13 moles of he = 13 x 6.022 x [tex]10^{23}[/tex] = 7.8286 x [tex]10^{24[/tex] atoms
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1. The number of atoms in 52 mole of Ar is 3.13×10²⁵ atoms
2. The number of atoms in 52 u of He is 7.83×10²⁴ atoms
3. The number of atoms in 52 g of He is 7.83×10²⁴ atoms
Avogadro's hypothesis1 mole of substance = 6.02×10²³ atoms
1. How to determine the number of atoms in 52 mole of Ar1 mole of Ar = 6.02×10²³ atoms
Therefore,
52 mole of Ar = 52 × 6.02×10²³
52 mole of Ar = 3.13×10²⁵ atoms
2. How to determine the number of atoms in 52 u of He4 u of He = 1 mole
Thus,
52 u of He = 52 / 4
52 u of He = 13 moles
From Avogadro's hypothesis,
1 mole of He = 6.02×10²³ atoms
Therefore,
13 moles of He = 13 × 6.02×10²³
13 moles of He = 7.83×10²⁴ atoms
Thus,
52 u of He = 7.83×10²⁴ atoms
3. How to determine the number of atoms in 52 g of He4 g of He = 1 mole
Thus,
52 g of He = 52 / 4
52 g of He = 13 moles
From Avogadro's hypothesis,
1 mole of He = 6.02×10²³ atoms
Therefore,
13 moles of He = 13 × 6.02×10²³
13 moles of He = 7.83×10²⁴ atoms
Thus,
52 g of He = 7.83×10²⁴ atoms
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What is the formula mass of a compound with 2 aluminum atoms and 3 oxygen atoms?
Answer:
[tex]\boxed {\boxed {\sf 101.96 \ amu}}[/tex]
Explanation:
Formula mass is the sum of the atomic masses of the atoms in a molecule. Essentially, it is the mass of 1 molecule of a compound.
We are given a compound containing 2 aluminum atoms and 3 oxygen atoms. We will use the Periodic Table to look up the atomic masses of the 2 elements in the compound.
Al: 26.981538 amuO: 15.999 amuThese are the atomic masses of 1 atom of the element. Remember we have 2 Al atoms and 3 O atoms. We multiply the element's atomic mass by the number of atoms of that element in the compound.
2 Al: 26.981538 amu *2= 53.963076 amu 3 O: 15.999 amu * 3=47.997 amuNow we add the atomic mass of 2 Al atoms and 3 O atoms.
53.963076 amu + 47.997 amu = 101.960076 amuWe may want to round this answer to the hundredth place. The 0 in the thousandth place tells us to leave the 6 in the hundredth place.
101.96 amuThe formula mass of a compound with 2 aluminum atoms and 3 oxygen atoms is approximately 101.96 atomic mass units.
Copper has average atomic mass of 63.546 amu. It's two isotopes are Cu-63 (which is 69.17% abundant and has a mass of 62.9296 amu) and Cu-65. From this information, calculate the mass of Cu-65.
Answer: 69.152% → 63^Cu
30.848% → 65^Cu
Explanation:
As you know, the average atomic mass of an element is determined by taking the weighted average of the atomic masses of its naturally occurring isotopes.
Simply put, an element's naturally occurring isotopes will contribute to the average atomic mass of the element proportionally to their abundance.
Explanation:
Name the bases which are used for given activities :
1. To purify sugar
2. To purify petroleum products
Answer:
1. to purify sugar , I think it is correct answer
Explanation:
hope it is helpful for you
thank you
Answer:
1. To purify sugar
=lime and carbon dioxide
2. To purify petroleum products
=hydrogen
Which of the following correctly
describes a physical change in
matter?
A. matter keeps its chemical makeup, but a
change in size, shape, volume, or state of matter
occurs
B. particles leave and a new substance is made
C. a new substance is formed by atoms
combining in different ways
Answer:
the option A is right matter keeps it's chemical makeup like size shape volume and state
How many micrograms (ug)
are equal to 0.000520 grams?
[?] ug
Answer:
520
Explanation:
This is easy
This is my cookie >:( you cannot have it
(Also the question of the cookie is it homogeneous or heterogeneous? DONT EAT IT [its mine])
