What is the answer with the proper significant figures 7.6+2.401+0.68=
Answer:
10.7
Explanation:
The addition of 7.6 + 2.401 + 0.68 = is 10.681.
According to the addition of sig figs, you want your answer to have the same amount of places, after the decimal point, as the least sig-fig figure.
7.6
2.401
0.68
+
----------
10.681 - Draw a line straight down from the least sig-fig figure (7.6)
So the maximum figure after the decimal point is one. Since 8 is greater than 5, you have to round up from 10.6 to 10.7.
Which two of these formulas have an equal number of carbon atoms present?
1 - MG3(PO)2
2 - Na SO4
3 - NO3(CH3)3
4 - C&H 206
5 - Al(NO3)3
3 and 4
1 and 2
3 and 5
3, 4, and 5
Choose the correct answer.
Answer:3 and 4
Explanation:I got it right on a quiz.
Answer:
3 & 4
Explanation:
At 25 degrees what is the [H+] and pH of a solution with a [OH] = 3.2 x 10^8 M?
Answer:
0.4699
Explanation:
from the illustration of the potassium atom fill in the periodic table selection
Answer:
2 electrons
8 electrons
8 electrons
1 electron (just count in the rings for these ones)
19 protons (it says "P=19" in the middle. The P stands for Protons)
K (it's from Latin medieval Latin "kalium")
39 (add proton and neutron amounts to get the approximate atomic mass--electrons are negligible)
Explanation:
In 1988, three gray whales were trapped in Arctic ice. Television crews captured the frantic attempts of hundreds of people to save the whales. Eventually, a Soviet icebreaker and U.S. National Guard helicopters arrived to help free the whales. The cost of the rescue mission exceeded $5 million.
i. Write a scientific question related to the whale story.
ii. Write a nonscientific question related to the whale story.
The scientific question related to the whale story is how were the whale's rescued? The non-scientific question related to the whale story is what was the need for spending such large amount of money?
What is a scientific question?It is a one where an investigation can be designed and can be approached to completion in order to find out an answer.This can be done without doing different investigations.
It should have valuable information and should have the potential that it can be answered by direct observations.It should always lead to a hypothesis.
A scientific question must have the following characteristics:
It must have an objective and should be testable.It should focus on an independent variable and a dependent variable.It should be feasible and coherent.Whereas, characteristics of a non -scientific question is that they are broad,and have many variables to be tested.
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Under which of the following circumstances might a person develop capgras delusion?
A. during childhood as a result of an emotional shock
B. as a result of a family predisposition to the condition
C. following a head injury that cause brain trauma
D. due to normal aging processes on the brain
Answer:
a
Explanation:
Which of the following species of manganese would have the largest atomic radius?
Answer:
Largest is Mg as across the period atomic radius decreases
The Density equation is:
Answer:
p=m/v
p equals density M equals mass and v = volume
What is the electron configuration for Cs^1+ ?
Answer:
electron configuration Cesium Electronic Configuration [Xe] 6s1
Explanation:
PLS GUYS HELP!!!! Examine the table with the distances and times recorded for five different trains. Calculate the average speed for each train and select the correct answer choices. Select ALL that apply.
Answer:
A: Train I had the fastest average speed
C: Trains II and V had the same average speed
E: Trains III and IV had the same average speed
Explanation:
17 Polly has a pencil that is 21 cm long. How long is the pencil
Answer:
The pencil is 8.268 inches
_________ is when humans choose the traits of an organism.
Your answer should be -selective breeding
[tex]hope that helps[/tex]
2 H2O(l) → 2 H2 (g) + O2 (g) ΔH°rxn = +572 kJ Determine the heat associated with the reaction (qrxn, in kJ) when 4.85 grams of H2(g) is produced.
The heat associated with the reaction (qrxn, in KJ) when 4.85 grams of H₂ is produced is +693.55 KJ
Balanced equation2H₂O → 2H₂ + O₂ ΔH°rxn = +572 KJ
Molar mass of H₂ = 2 × 1 = 2 g/mol
Mass of H₂ from the balanced equation = 2 × 2 = 4 g
SUMMARY
From the balanced equation above,
When 4 g of H₂ is produced, 572 KJ of heat where needed.
How to determine the heat requiredFrom the balanced equation above,
When 4 g of H₂ is produced, 572 KJ of heat where needed.
Therefore,
When 4.85 g of H₂ is produced = (4.85 × 572) / 4 = +693.55 KJ of heat will be required.
Thus, +693.55 KJ of heat is required for the reaction.
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What molecular shape is oxygen dibrimide
Answer:As predicted by VSEPR theory, the molecule adopts a "bent" molecular geometry similar to that of water.
Explanation:
what is kinetic enegry
Kinetic energy → the kinetic energy of an object is the energy that it possesses due to its motion
For an example ↓
Question 5 of 5
Which idea was not supported by Dalton's atomic model but was supported in
all later atomic models?
A. A central, positive nucleus
B. Electrons in orbits
C. Positive and negative parts
D. Electron clouds
Answer:
It’s A
The indivisibility of an atom was proved wrong: an atom can be further subdivided into protons, neutrons and electrons. However an atom is the smallest particle that takes part in chemical reactions. According to Dalton, the atoms of same element are similar in all respects.
Describe how you will separate suspension from colloidal solution?
Answer:Unlike those in a suspension, particles in a colloid do not separate when sitting still. The particles in a suspension may be separated by filtration unlike those in a colloid. Colloids are able to scatter light, but suspensions cannot transmit light
Which factor causes Earth’s seasons?
Answer:
The sun's position near earth
Explanation:
Hello there
i am looking for some quick help on this question thank you.
Liquid B has a mass of 75 g and a volume of 25 ml. What is liquid B's density?
1: .33 g/ml
2: 3 g/ml
3: 75 g
4: 25 ml
Answer:
To measure the density of a liquid you do the same thing you would for a solid. Mass the fluid, find its volume, and divide mass by volume. To mass the fluid, weigh it in a container, pour it out, weigh the empty container, and subtract the mass of the empty container from the full container.
Explanation:
Answer:
[tex] \rho = \frac{mass}{vol} \\ = \frac{75 \: g}{25 \: ml} = 3g .{ml}^{ - 1} [/tex]
Light-DEPENDENT reactions do NOT involve which of the following?
A. sunlight
B. chlorophyll
C. water
D. carbon dioxide
Answer:
The answer to your question is D. carbon dioxide
Explanation:
Light-DEPENDENT → The light-dependent reactions convert light energy into chemical energy.
draw a conclusion a weather balloon carries sensing instruments very high altitudes to detect weather information. a weather balloon is filled near earth's surface with a low density gas. describe what happens to the particles the pressure, and the volume inside the balloon as it rises.
Answer:
im sorry the answer if i did i would
Explanation:
Select the best answer.
Which element's atoms are most likely to touch each other without overlapping?
iron
hydrogen
carbon
radon
Answer: iron
Explanation: Metals' atoms are closely bonded in a crystal lattice. In metallic bonds, the electron cloud boundaries of atoms touch each other. Many nonmetals occur as diatomic molecules. The electron clouds of these two bonded nonmetal atoms overlap .
Hydrogen atoms are most likely to touch each other without overlapping because of their small size and simple atomic structure.
A hydrogen molecule is a particle of the synthetic component hydrogen. The electrically unbiased molecule contains a solitary emphatically charged proton and a solitary adversely charged electron bound to the core by the Coulomb force. Nuclear hydrogen is around 75% of the baryonic mass of the universe.
Hydrogen exist as diatomic particle, I.e., it can exist by attaching to another hydrogen. You realize that hydrogen has just a single electron in it's furthest and just shell. Yet, to accomplish a steady design, there should be two electrons in this shell. So two hydrogen molecules share their electrons by holding.
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PLEASE HELP , 50 points!
Write the electron configuration of a -2 ion with 16 protons.
Answer:
1s^2 2s^2 2p^6 3s^2 3p^6
Explanation:
Number of electrons = Number of protons. Originally, sulfur has 16 protons, but the question asks states 2- ions. So S^(2-), or a total of 18 protons. Follow the rules, and make sure the exponents add up to 18. 2 + 2 + 6 + 2 + 6 = 18 electrons.
The basic unit of structure and function of living things is the .
Answer:
It would be cell
Explanation:
If im correct then please mark me as brainliest!
Describe the five layers of the earth by providing the following information for each layer:
Name of the layer
Composition
Average temperature
Average thickness
make simple! pls
Answer:
answers below
Explanation:
Lithosphere/ Crust- made of large plates that move, average thickness is 30 km, average temperature is 25 degrees Celsius
Inner Core- made of solid iron, 1,200 km thick, 7,000 degrees Celsius
Outer Core- made of a dense liquid of iron and sulfur, 2,250 km thick, 4,000 degrees Celsius
Lower Mantle- made of solid rock, 2,200 km thick, 3,000 degrees Celsius
Asthenosphere/ Upper Mantle- made up of solid rock that flows due to plasticity, 720 km thick, 850 degrees Celsius
How many more electrons does each oxygen atom need to be stable?
Molybdenum can form a wide series of halide compounds, including four different fluoride compounds. The percent by mass of molybdenum in the four compounds is 63.0%,
56.0%,
50.0%,
and 46.0%.
Determine the formula and name for each of the four different molybdenum fluorides.
The formula and names of the compounds are:
1. Formula of compound => MoF₃
Name of compound => Molybdenum trifluoride
2. Formula of compound => MoF₄
Name of compound => Molybdenum tetrafluoride
3. Formula of compound => MoF₅
Name of compound => Molybdenum pentafluoride
4. Formula of compound => MoF₆
Name of compound => Molybdenum hexafluoride
1. Determination of the name and formula of the molybdenum fluoride having 63.0% of molybdenum.
Molybdenum (Mo) = 63.0%
Fluorine (F) = 100 – 63 = 37%
Formula =?Mo = 63.0%
F = 37%
Divide by their molar mass
Mo = 63.0 / 96 = 0.656
F = 37 / 19 = 1.947
Divide by the smallest
Mo = 0.656 / 0.656 = 1
F = 1.947 / 0.656 = 3
Therefore,
Formula of compound => MoF₃
Name of compound => Molybdenum trifluoride
2. Determination of the name and formula of the molybdenum fluoride having 56.0% of molybdenum.
Molybdenum (Mo) = 56.0%,
Fluorine (F) = 100 – 56 = 44%
Formula =?Mo = 56%
F = 44%
Divide by their molar mass
Mo = 56 / 96 = 0.583
F = 44 / 19 = 2.316
Divide by the smallest
Mo = 0.583 / 0.583 = 1
F = 2.316 / 0.583 = 4
Therefore,
Formula of compound => MoF₄
Name of compound => Molybdenum tetrafluoride
3. Determination of the name and formula of the molybdenum fluoride having 50.0% of molybdenum.
Molybdenum (Mo) = 50.0%,
Fluorine (F) = 100 – 50 = 50%
Formula =?Mo = 50%
F = 50%
Divide by their molar mass
Mo = 50 / 96 = 0.520
F = 50 / 19 = 2.632
Divide by the smallest
Mo = 0.520 / 0.520 = 1
F = 2.632 / 0.520 = 5
Therefore,
Formula of compound => MoF₅
Name of compound => Molybdenum pentafluoride
4. Determination of the name and formula of the molybdenum fluoride having 46.0% of molybdenum.
Molybdenum (Mo) = 46.0%,
Fluorine (F) = 100 – 46 = 54%
Formula =?Mo = 46%
F = 54%
Divide by their molar mass
Mo = 46 / 96 = 0.479
F = 54 / 19 = 2.842
Divide by the smallest
Mo = 0.479 / 0.479 = 1
F = 2.842 / 0.479 = 6
Therefore,
Formula of compound => MoF₆
Name of compound => Molybdenum hexafluoride
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Which two substances are among the four major types of organic
compounds made by living things?
A. Potassium
B. Water
C. Carbohydrates
D. Proteins
Answer: Carbs and proteins
Explanation:
Answer:
the answer is proteins
Explanation:
did the problem
What type of element are the following elements?
A) Na
B) Со
C) Bi
D) O
Which electron transition emits electromagnetic radiation with the highest energy?
n = 2 to n = 1
n = 6 to n = 2
n = 6 to n = 3
n = 4 to n = 1
Answer:
So, you can say that in a hydrogen atom, an electron located on
n i=2
that absorbs a photon of energy
4.85⋅10−19
J can make the jump to n f=6.