Answer:
A
Explanation:
B) pollution doesn't affect water
C) Air pollution makes carbon dioxide
D) air pollution does not affect temperature
I had graduated cylinder with 50 mL of water. I added a rock to the graduated cylinder and the water level rose to 56 mL. What is the VOLUME of the rock?
Which three things does a plant need to create a glucose molecule in photosynthesis?
Choose all correct answers.
water
oxygen
carbon dioxide
sunlight
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.
PLEASE HELP CHEMISTRY QUESTION
When two solutions are mixed in a beaker, a reaction occurs, and the temperature drop is the reaction of……..
A) exothermic and -ve enthalpy
B) endothermic and -ve enthalpy
C) exothermic and +ve enthalpy
D) endothermic and +ve enthalpy
Answer:
B
Explanation:
the reaction is endothermic because of the temperature drop and the enthralpy is negative because its an endothermic reaction.
I did some research so I believe this to be correct but if its no I'm sorry
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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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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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
5.The amount of pollution produced by cars was measured for cars using gasoline containing different amounts of lead. what is the independent, dependent and controlled variables?
Independent: Gasoline with different amounts of lead Dependent: Amount of pollution produced
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.
do you think organisms who live in the artic would survive in the desert? Do you think organisms in the desert would survive in the artic? Why or why not?
Answer:
I'd say probably not
Explanation:
Organisms have evolved to survive and thrive in particular environmental conditions, specifically focusing on food supply, temperature, terrain, etc.. Therefore, desert animals would not be equipped with the insulation to survive in cold climates like the artic, and would freeze to death, and artic animals would most likely die from heat exhaustion in the desert. Additionally, fish, which is a main food source for articles animals, are not available in the desert, and it's the same case for desert animals in the artic. Finally, those organisms' enzymes and proteins, which make up their being and are the reason they can function, are only optimal in the temperature range in which they normally live; therefore, switching to such drastically different climate would result in their enzymes denaturing and their cell and eventual organism death.
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
Which piece of information could a person obtain from a contour map?
1.
the mineral composition of a mountain
2.
the elevation of a mountain
3.
the speed of water flow in a river
4.
the amount of water in a river
Answer:
2. The elevation of a mountain.
Explanation:
Contour maps are only used for elevation
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.
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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#SPJ2
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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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:
Convert 25 gigaseconds into centiseconds
25 gigaseconds is equal to 2,500,000,000,000 centiseconds
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
mixture requires constant shaking to keep its constituents combined. It is best described as a _____.
homogenous mixture
colloid
suspension
solution
Answer:
[tex] \tiny \tt \: [/tex]
Suspension
Vocabulary crossword puzzle properties of minerals
Answer:
? no image
Explanation:
CH4 + 202 → CO2 + 2H2O
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 ratio of oxygen to iron in iron oxide?
Answer:0.2865
Explanation:
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
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
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
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:
Please someone help WHATS 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 balanced equation for the decomposition of calcium oxide?