Answer:
you need data that has at least one independent variable in order to plot a graph for a slope of the line
Explanation:
how many moles of LiOH are needed to react completely with 25.5 g of CO2
Answer:
3.18 mol
Explanation:
[tex]2LiOH+CO_{2}-> Li_{2}CO_{3} +H_{2}O[/tex]
n(CO2) = mass/ Mr.
= 25.5 / 16
= 1.59 mol
As per the equation above,
n(LiOH) : n(CO2)
2 : 1
∴ 3.18 : 1.59
An engineering company needs to
solve a design problem.
It is designing a high-speed train to transport
passengers
between Boston and Atlanta.
Which statement is a criterion for this project?
O A. The train must not take more than six years
to build
B. The train must not have wheels with bearings
that need
lubrication,
O C. The train must cost less than $150 million
to design.
D. The train must be able to maintain a speed of
250 km/h.
Answer:D.the train must be able to maintain a speed of 250km/h.
Explanation:
what would be the atomic mass of Carbon-14
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
Can someone please help me out !!!!
Answer:
yyreyytryrryrtryryyye
Explanation:
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.
Which of the following is NOT a valid conversion factor?
A. 12 hours/1 days
B. 1 yard/3 feet
C. 1 dozen/12 cookies
D. 60 seconds/1 minute
Answer:
the answer is D I would say thats the answer
Answer:
I really don't know how I got to switching to a new job because I was in a hurry
1.) What is a scientific method
2.) What must you always do if you want your statement taken seriously
3.) The scientific method starts with a.
777,600 seconds to days
Answer:
9 days
No explanation needed.
1 Qu'est-ce qu'un atome?
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:
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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Give reasons :
1. Ammonia is not collected through downward displacement of water.
2. Ammonia is collect by the downward displacement of air.
3. Carbon dioxide is used in fire extinguisher.
4. H₂SO₄ is not used in the preparation of CO₂.
5. The opening of hard glass test tube is slanted down during laboratory preparation of ammonia gas
6. Carbon dioxide doesn't support in burning but Mg burns in it.
- Help!! Plagiarised / Random answers will be reported! ~ Thanks in advance! :)
Ans 1:
Ammonia is not collected over water since it is highly soluble in water
Ans 2:
Ammonia gas is lighter than air and hence collected by the downward displacement of air.
Ans 3:
The carbon dioxide is very cold as it comes out of the extinguisher, so it cools the fuel as well.
Ans 4:
H₂SO₄ is not used in the preparation of carbon dioxide Because the calcium sulphate formed is insoluble in water. So, CO₂ will not form.
Ans 5:
The opening of hard glass test tube is slanted down during laboratory preparation of ammonia gas because Ammonia gas is not collected in the gas jar by upward displacement of air because it is lighter than air
Ans 6:
Magnesium is reactive enough to be combusted and oxidized in a reaction with carbon dioxide:
The magnesium strip burns brightly in the air, but continues to burn in the carbon dioxide environment
-TheUnkownScientist
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.
What do you do to test a hypothesis
Guess
Create a spreadsheet with data
Publish a scientific paper
Design an experiment
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:
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
Someone plz help me :(
Answer: i think it's A
Explanation:
The volume of a brick is 52 cubic inches. Which choice best describes its volume?
Answer:
I think he was right but not explaining
Explanation:
I think it is C cause.... the volume of a material is the amount of matter that matterial can hold. it should the the amount of space the whole material takes up.
so C is the answer.
pls make this the brainliest.
not because it is, but because I asked.
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
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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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
Choose the elements whose atoms you expect to have greater shielding effects?
(i) Be or Mg
(iii) F or Cl
(ii) C or Si
(iv) B or Al
with full explanation
Answer:
be or mgExplanation:
because of the it is easier to remove electron from the outer most shell
Answer:
(iii) since one of the components Chlorine and has the highest shielding effect has per the junior periodic table
Please help due at 11:00
what are elements?????
An element is a substance that cannot be broken down into any other substance.
I hope this answer helps you..
What is gold?
А.
two or more elements joined together chemically
B.
an element
Answer:
Gold is a Chemical element
The process by which any metal is extracted from its ore is
A)reduction
B)electrolysis
C)displacement
D)decomposition
Answer:
D displacement
Explanation:
This is because removing metal means your displacing it
Simplify - Factor a
Which particles represent a solid? *
Option 1
Option 2
Option 3
Option 4 - Surface of sun
Answer:
Option 1
Explanation:
Option number 1 is the most compact one which indicates it is a solid
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!
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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