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
Proses yang manakah mempunyai kadar tindak balas yang paling tin gi? Which process has the highest rate of reaction? A Fotosintesis Photosynthesis B Respiration Respiration C Pembakaran Combustion D Rusting Pembakaran
Explain why the boiling of water is a physical change
Boiling waterBoiling water is an example of a physical change and not a chemical change because the water vapor still has the same molecular structure as liquid water (H2O). If the bubbles were caused by the decomposition of a molecule into a gas (such as H2O →H2 and O2), then boiling would be a chemical change.
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.
What do you do to test a hypothesis
Guess
Create a spreadsheet with data
Publish a scientific paper
Design an experiment
What does the following element description actually mean? (File below)
A. It means it is an aluminum atom with 27 protons and 13 electrons.
B. It means it is an aluminum atom with 27 electrons and 13 protons.
C. It means it is an aluminum atom with 13 neutrons and 14 protons.
D. It means it is an aluminum atom with 13 protons and 14 neutrons.
E. None of the above.
Answer:
Explanation:
This is an aluminum atom with 13 proton because from what henry said in the year 1914 he said that the number of protons of an element is equal to the number of electrons for an neutral atom..an you expect the number of electrons to be the atomic number.( The number that is used to locate the elements in the periodic table (1869).
And the number of neutron is 13 because form the mass number of the elements and we no that the mass number of an element is the sum of the proton and the neutron..MN=P + N.....so when 13 is substracted from 27 the answer is 14. So the answer is option D.
Oxygen has an atomic number of 8. Which of the following could form the nucleus of an atom of oxygen?
6 protons and 8 neutrons.
4 protons and 4 neutrons. 6 protons and 2 neutrons. 8 protons and 10 neutrons.
Answer:
Answer: 8 protons and 8 neutrons
Explanation:
The mass number of oxygen is 16
Atomic number is 8
but proton number = atomic number = 8 protons
[tex]neutrons = mass \: number - atomic \: number \\ [/tex]
neutrons = 16 - 8 = 8 neutrons.
The nucleus of an atom of oxygen typically contains 8 protons and 8 neutrons specifically. So, none of the above options is correct.
What is the formula for calculating the atomic number?The atomic number may be defined as the number of a chemical element in the periodic table through which the elements are arranged in order of increasing the number of protons in the nucleus.
The atomic number of an element = The number of protons in the nucleus of an atom.
Now, according to the question,
If Oxygen has an atomic number of 8, that means the number of protons = 8.
The number of neutrons can be calculated as follows:
Neutrons = mass number - the atomic number.
= 16 - 8 = 8 neutrons.
Therefore, the nucleus of an atom of oxygen typically contains 8 protons and 8 neutrons specifically. So, none of the above options is correct.
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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.
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
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:
this is so CONFUSING WTH anyone kind to help with those two questions just answer how much you know, I’ll still brainlist it’s urgent!
Answer:
4. mutualism - both benefit
5. Commensalism- one benefits while the other is not affected
"Mutualism is a symbiotic relationship in which both species benefit. Commensalism is a symbiotic relationship in which one species benefited while the other species is not affected."
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
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
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
The smallest volume from among the following is.
18 mL
O 1.6x10-2 L
O 25 ml
O 0,012 L
Answer: 12
Explanation: 18mL 14L(1.6x10-2) 23ml 12L
1 Milliliter (mL) is equal to 0.001 liter (L)
1.6x10-2= 14 you see my point?
18 and 23 are both mL so bye bye 14 bigger then 12 so there
1 Qu'est-ce qu'un atome?
What was important about the copernican revolution?
A. It was the first time a new theory was published in a book.
B. The scientific community never accepted it.
C. It demonstrated that scientific understanding was always changing.
D. It caused an immediate shift in accepted ideas.
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
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:
Can someone please help me out !!!!
Answer:
yyreyytryrryrtryryyye
Explanation:
Someone plz help me :(
Answer: i think it's A
Explanation:
777,600 seconds to days
Answer:
9 days
No explanation needed.
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
An isotope of hydrogen commonly referred to as heavy water is
Answer:
Heavy water is a compound that is made up of oxygen and deuterium, a heavier isotope of hydrogen which is denoted by ‘ 2 H’ or ‘D’. Heavy water is also called deuterium oxide and is denoted by the chemical formula D 2 O.
Density: 1.107 g/mL
Dipole moment: 1.87 D
Heavy Water (Deuterium Oxide): D2O
Molecular Mass: 20.02 grams/mole
Explanation:
What is gold?
А.
two or more elements joined together chemically
B.
an element
Answer:
Gold is a Chemical element
If Block A is located on the Moon and Block B is located on
Earth, which of the following is true about the two blocks?
a They have the same mass.
sty
b They have the same weight.
ed a Hint?
C They have the same volume.
d They have the same density.
Answer: they have the same mass
Explanation:weight is calculated
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
Balance and classify the following equations as synthesis, decomposition, single replacement, double replacement, or combustion: a. C4H10 + 02 -> CO2 + H20 Reaction Type: b. ___ HNO3 + Mg(OH)2 -> Mg(NO3)2 + H20 Reaction Tyne.
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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