The number of silicon atoms in atypical computer chips(0.001g of silicon) is 2.14 × 10¹⁹ atoms
The atomic mass of silicon = 28.0855 amu
Using the mole concept that 1 mole = 6.022 × 10²³.
This number is called the Avogadro's number.
Therefore,
1 mole / 28.0855g of silicon contains 6.022 × 10²³ atoms of silicon
0.001 g will contain ? atoms of silicon
cross multiply
number of atoms of silicon = 6.022 × 10²³ × 0.001 / 28.0855
number of atoms of silicon = 6.022 × 10²⁰ / 28.0855
number of atoms of silicon = 2.14 × 10¹⁹ atoms
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Is the charge of anucleus positive, negative or neutral what about the charge of an atom
Answer:
The nucleus has an overall positive charge as it contains the protons.
Explanation:
Every atom has no overall charge (neutral). This is because they contain equal numbers of positive protons and negative electrons. These opposite charges cancel each other out making the atom neutral.
Convert 25 gigaseconds into centiseconds
25 gigaseconds is equal to 2,500,000,000,000 centiseconds
All the organisms alive today arose from preexisting organisms.
O True
O False
Organisms often die with a little time. They make new oragnisms which then carry on their legacy.
what is the ratio of oxygen to iron in iron oxide?
Answer:0.2865
Explanation:
Which three things does a plant need to create a glucose molecule in photosynthesis?
Choose all correct answers.
water
oxygen
carbon dioxide
sunlight
A 13. 00 g sample of citric acid reacts with an excess of baking soda as shown in the equation. Upper H Subscript 3 Baseline Upper C Subscript 8 Baseline Upper H Subscript 5 Baseline Upper O Subscript 7 Baseline 3 Upper N a Upper H Upper C Upper O Subscript 3 Baseline right arrow 3 Upper C Upper O Subscript 2 Baseline 3 Upper H Subscript 2 Baseline Upper O Upper N a Subscript 3 Baseline Upper C Subscript 8 Baseline Upper H Subscript 5 Baseline Upper O Subscript 7. What is the theoretical yield of carbon dioxide? 0. 993 g 2. 98 g 3. 65 g 8. 93 g.
Answer:
The answer is C.
Explanation:
i got a 100 on the test
The theoretical yield of carbon dioxide, CO₂ obtained from the reaction is 8.93 g
We'll begin by calculating the mass of citric acid, H₃C₆H₅O₇ that reacted and the mass of carbon dioxide, CO₂ produced from the balanced equation.
H₃C₆H₅O₇ + 3NaHCO₃ —> 3CO₂ + 3H₂O + Na₃C₆H₅O₇
Molar mass of H₃C₆H₅O₇ = (3×1) + (12×6) + (5×1) + (7×16) = 192 g/mol
Mass of H₃C₆H₅O₇ from the balanced equation = 1 × 192 = 192 g
Molar mass of CO₂ = 12 + (2 × 16) = 44 g/mol
Mass of CO₂ from the balanced equation = 3 × 44 = 132 g
From the balanced equation above,
192 g of H₃C₆H₅O₇ reacted to produce 132 g of CO₂
Finally, we shall determine the theoretical yield of CO₂. This can be obtained as follow:
From the balanced equation above,
192 g of H₃C₆H₅O₇ reacted to produce 132 g of CO₂.
Therefore,
13 g of H₃C₆H₅O₇ will react to produce = (13 × 132) / 192 = 8.93 g of CO₂.
Thus, the theoretical yield of CO₂ is 8.93 g
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Please someone help WHATS the answer
construct a Device to Regulate the
Release of Energy - Student Guide
PLEASE WRITE IN LAB REPORT FORM ASAP PLEASE HELP 75 POINTS WILL MARK BRIANLIEST
Answer:
Hi there
Thermal Energy and Chemical Reactions
The device controlled the activation as shown by the water holding room temperature for 15 seconds until activation by crushing the pills. The temperature rose 30° over two minutes,showing a measurable exothermic reaction from the Calcium Chloride dissolving in the water.
Pour 5mL water in a quart bag
Place Thermometer in the bag to make contact
Fill two gelatin 000 capsules with 1 gram of Calcium Chloride
Place capsules into the bag
Wait 15 seconds to crush the capsules while they are submerged in the water
-Temperature
0 seconds 75 degrees
15 seconds - Activation 75 degrees
30 seconds 85 degrees
60 seconds 95 degrees
90 seconds 104 degrees
120 seconds 105 degrees
Conclusion: During a reaction, thermal energy from the environment is converted into chemical energy stored in the products.
Brainliest plz
Which molecule has the same empirical formula as molecular formula?
A. CH3COOH
B. C2H5OH
C. C2H4
D. C4H10
and what is the working
the answer is C ( i think )
The correct statement which has the same empirical formula as molecular formula is "CH3COOH".
What is empirical formula?A chemical compound's empirical formula is a representation of the simplest whole number ratio between its constituent parts.
What is molecular formula?The molecular formula is a depiction of the compound's actual whole number ratio between its constituent parts.
To put it another way, molecular formulas tell you how many atoms of each element are in a compound, whereas empirical formulas tell you the simplest or most reduced ratio of components.
Acetic acid has the molecular chemical formula CH3COOH. In the order C: H: O, the true whole number ratio is 2: 4: 2. In the order C: H: O, the smallest simple whole number ratio is 1: 2: 1. As a result, acetic acid's empirical formula is CH2O.
Hence, the correct option is A.
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Excess Na2SO4 (aq) is added to a 42.53 mL sample of Ba(NO3)2(aq).
1. What is the formula of the precipitate?
The formula for the precipitate is 2Na(NO3)(aq).
2. If 3.046 grams of precipitate was formed, what was the molarity of the Ba(NO3)2(aq)?
1. The formula of the precipitate formed is Ba₂SO₄(s)
2. The molarity of the Ba(NO₃)₂ solution is 0.188 M
1. Determination of the formula of the precipitate formed.
We'll begin by writing the net ionic equation for the reaction between Na₂SO₄ and Ba(NO₃)₂. This is given below:Na₂SO₄(aq) + Ba(NO₃)₂(aq) —>
2Na⁺(aq) + SO₄²¯(aq) + Ba²⁺(aq) + 2NO₃¯(aq) —> Ba₂SO₄(s) + 2Na⁺(aq) + 2NO₃¯(aq)
Cancel the spectator ions (i.e Na⁺ and NO₃¯) to obtain the net ionic equation
SO₄²¯(aq) + Ba²⁺(aq) —> Ba₂SO₄(s)
Therefore, the formula of the precipitate formed is Ba₂SO₄(s)
2. Determination of the molarity of Ba(NO₃)₂
We'll begin by calculating the number of mole of in 3.046 g of precipitate, Ba₂SO₄Molar mass of Ba₂SO₄ = (2×137) + 32 + (4×16) = 370 g/mol
Mass of Ba₂SO₄ = 3.046 g
Mole of Ba₂SO₄ =?Mole = mass /molar mass
Mole of Ba₂SO₄ = 3.046 / 370
Mole of Ba₂SO₄ = 0.008 mole Next, we shall determine the number of mole of Ba(NO₃)₂ required to produce 0.008 mole of Ba₂SO₄Na₂SO₄(aq) + Ba(NO₃)₂(aq) —> Ba₂SO₄(s) + 2NaNO₃(aq)
From the balanced equation above,
1 mole of Ba(NO₃)₂ reacted to produce 1 mole Ba₂SO₄.
Therefore,
0.008 mole of Ba(NO₃)₂ will also react to produce 0.008 mole of Ba₂SO₄
Thus, 0.008 mole of Ba(NO₃)₂ is required for the reaction.
Finally, we shall determine the molarity of the Ba(NO₃)₂ solutionMole of Ba(NO₃)₂ = 0.008 mole
Volume = 42.53 mL = 42.53 / 1000 = 0.04253 L
Molarity of Ba(NO₃)₂ =?Molarity = mole / Volume
Molarity of Ba(NO₃)₂ = 0.008 / 0.04253
Molarity of Ba(NO₃)₂ = 0.188 MLearn more: https://brainly.com/question/13403073
Vocabulary crossword puzzle properties of minerals
Answer:
? no image
Explanation:
Which two statements describe a claim that is based on science?
A. It is based on logical reasoning.
B. It is based on empirical evidence.
C. It is based on personal bias.
D. It is Based on a long tradition.
Answer:
A AND B
Explanation
Personal bias and tradition have nothing to do with true scientific CLAIMs. We reach the truth by careful observations and logical reasoning (see Sherlock Holmes).
so
A AND B
What is the balanced equation for the decomposition of calcium oxide?
Which processes could the heating curve be describing? Check all that apply.
boiling
condensation
endothermic reaction
exothermic reaction
freezing
Answer: condensation, exothermic reaction, freezing
Explanation: Edge
The heating curve could describe processes such as boiling, condensation and freezing.
What is a heating curve?A heating curve is a plot or graph wherein a substance is subjected to increasing temperature against time to measure the amount of energy it absorbs and changes state with increasing temperature.
Which processes could the heating curve be describing?
boiling. Yes, since matter goes from liquid to gas.condensation. Yes, since matter goes from gas to liquid.endothermic reaction. No, since phase changes are physical changes.exothermic reaction. No, since phase changes are physical changes.freezing. Yes, since matter goes from liquid to solid.The heating curve could describe processes such as boiling, condensation and freezing.
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HELP ASAP
What experiments did Neils Bohr complete for the atomic theory?
Answer:
I don't know.
Explanation:
I'm not very smart
A chain reaction is created in a nuclear plant when U-235 in the fuel rods is bombarded with _____, causing the nucleus to become unstable and split.
Answer:
nuclear fission.
that's the answer
What is the percentage of Aluminum in Aluminum Sulfate?
Answer:
342. 15 g/mol is the mass
Al Aluminium 26.98g 2 atoms per mole = 15.7716%
S Sulfur 32.06g 3 atoms per mole = 28.1151%
O Oxygen 15.99g 12 atoms per mole = 56.1133%
Explanation:
Hope this helps
Answer:
15,7%
Explanation:
What is the percentage of Aluminum in Aluminum Sulfate?
Aluminum Sulfate
is Al2 (SO4)3
its molar mass is
(2 X 27) + (3 X 96) = 54 + 288 = 344
THE % Al IS (54 /344) X 100 = 15,7%
What is the formula for ammonium
Answer:
The formula for ammonium is NH₄⁺
In your own words, explain in a simple and short way of what matter is, and how is it described.
Answer:
The basic thing that all things are made up of
Explanation:
CH4 + 202 → CO2 + 2H2O
Count the following atoms
NEED ANSWER ASAP
Answer:
2x(hn)po
Explanation:
Use the community property to reorder the terms
Remove the unnecessary parentheses
2hnpo
2hnop
use the community property to reorder the terms
2hnop
Imagine yourself making a nice cup of tea on a cold winter day. You begin by boiling some water in a kettle. Next, you add the steaming liquid to your cup. Then, you open a tea bag and repeatedly dunk it into the water. You pour a dash of milk and drop a few sugar cubes into the cup, stirring the solution with a spoon. Finally, you squeeze a bit of lemon into your tea mixture. However, before you have time to stir the lemon juice into your tea, the liquid forms clumps. In other words, your tea has curdled!
Based on the scenario, answer the questions below.
Which of the four indicators of a chemical change is described in the paragraph above?
What makes the tea with milk and lemon curdle?
Name some of the chemical substances in the tea mixture. (You will need to conduct some research on your own to do this.)
Which chemicals could have reacted to cause the curdling?
How can a soda can and illumine foil be the same mass?
Answer:
Foil is made from the same material as soda cans (aluminum), but since it's most often contaminated with food waste or combined with plastic (like with yogurt tops), there's no guarantee you can recycle it with your aluminum cans.
Explanation:
Mark me brainly please
A red car and a black car begin to accelerate from rest at the same time. The red car accelerates at a constant rate of 3 meters per square second. The motion of the black car is shown in the graph below.imageWhich of the following statements correctly compares the acceleration of the two cars?A.While the cars are accelerating, the red car accelerates faster than the black car.B.While the cars are accelerating, the black car accelerates faster than the red car.C.The red car only accelerates faster than the black car for the first second of acceleration.D.The black car only accelerates faster than the red car for the first second of acceleration.
That car moves or accelerates faster which has the higher speed.
If the red car accelerate at higher speed than black car then the red car reach first on the destination but if the black car moves with higher speed than red car then the black car reach its destination earlier than the red car.
The conclusion can be drawn when the image is present or any data but there is no data or image present which provides us accurate information so we can conclude logically that car which moves at higher speed will move faster than the other car.
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Which of the following is NOT an example of a communicable disease.
The none communicable disease in the given option is diabetes
What is a communicable disease?A communicable disease is a type of disease that can be spread from one person to another.
Examples of communicable diseases include;
HIV, Hepatitis (A, B, C) Measles, TuberculosisInfluenzaCommon coldThus, the none communicable disease in the given option is diabetes.
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what is the electron configuration of a n3- anion?
Answer:
You can see in the above illustration of the periodic table that N is in Period 4, Group 5A, and p-block. Before reaching N, you will pass through the atomic orbitals 1s, 2s, and 2p. The electron configuration of N3- is N3-: 1s22s22p6 .
Explanation:
PLEASE EXPLAIN what is glucose
Answer:
(Hope this helps can I pls have brainlist (crown)☺️)
Explanation:
Glucose is the most common form of sugar in the blood and the body's primary source of energy. Glucose is derived from the meals we eat or produced by the body from other chemicals. The circulation transports glucose to the cells. Several hormones, including insulin, regulate blood glucose levels.
a simple sugar that is a component of many carbohydrates and is a vital source of energy in living things.
Blood sugar, often known as glucose, is the most common sugar present in the body. It is your body's major source of energy and comes from the food you eat. Glucose is carried by your blood to all of your body's cells, where it is used for energy.
A. Parts of Solutions
1. The substance that exists in the greatest quantity in a solution is called
the
Answer:
a
Explanation:
the substance that exists
The element X has three naturally occurring isotopes. The masses (amu) and % abundance of the isotopes are given in the table below. The average atomic mass is ______amu. Give your answer two decimal places.
Answer:
In order to solve for this you would need to plug it into an equation. You would add them all up to eachother after multiplying them by their percentages.
So it would be (0.75*48.90)+(0.18*49.10)+(0.07*50.20). Plug it all into a calculator and you get 49.027amu. Then you would round to significant figures so 49.03amu should be your answer.
Which has more molecules?
A. 1 mole H2O
B. 1 mole Al(OH)3
C. 1 mole NaCl
D. There are all the same
Explanation:
1 mole H2OI hope it's helpful for you
1 mole of H₂O has more molecules than other compounds. The correct option is A.
What are molecules?
A molecule is a collection of two or more atoms held together by attractive forces known as chemical bonds.
The International System of Units uses the mole as the unit of material quantity. How many elementary entities of a specific substance are present in an object or sample is determined by its quantity.
The tiniest component of any substance is capable of existing independently while maintaining its chemical and physical properties and is composed of one or more elements.
Out of these molecules, water has more molecules than 1 mole Al(OH)₃ and 1 mole NaCl. They don't have the same number of moles.
Therefore, the correct option is A. 1 mole H₂O.
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