Answer:
8
Explanation:
becus it just how that is ok kidhdod
What is the final step in scientific polling?
A. interpreting the results
B. selecting the sample
C. presenting carefully worded questions
D. identifying the universe
Answer:select and control A. interpreting the results
Explanation:
Calculate the number of copper atoms in 2.45 mole of copper
Answer:
1.48×10²⁴ Cu atoms
Explanation:
For this question you need to use Avogadro's number 6.022×10²³atoms.
2.45 moles of Cu ×[tex]\frac{6.022x10x^{23} atoms }{1 mole}[/tex]= 1.47539×10²⁴ atoms.
The moles cancel out so you are left with atoms.
Since there are 3 significant figures in the question there should be 3 significant figures in your answer, which is 1.48×10²⁴ Cu atoms.
Which of the following is a property of water?
Will give brainliest!
Which of the following is the molecule with highest number of covalent bonds?
1.O2
2. N2
3. NH3
4. CO2
can waves travel through empty space? why?
Answer:
Elctromagnetic waves can travel through empty space.
Explanation:
Waves that may pass through matter or empty space are known as electromagnetic waves. The electromagnetic field, like the other basic fields, penetrates the whole universe, including the region we refer to as empty space. There are no fields in space. The medium through which electromagnetic waves travel is called the electromagnetic field.
g. Name a separating method for each of the question. (3)
I. Sodium chloride from the sodium chloride salt solution
II. Pure water from the sea water
III. Sand from the mixture of sand and salt solution
Describe the properties of the transuranium elements.
Nuclear properties. Isotopes of the transuranium elements are radioactive in the usual ways: they decay by emitting alpha particles, beta particles, and gamma rays; and they also fission spontaneously. The table lists significant nuclear properties of certain isotopes that are useful for chemical studies.
hope this helps
The specific heat of a substance is the amount of energy needed to raise the temperature of:.
the specific heat capacity is the energy needed to raise the temperature of 1kg of that substance by 1 degree
How many grams of nickel would be electroplated by passing a constant current of 7.2 A through a solution of NiSO4 for 90.0 min
The amount of nickel that would be electroplated by passing a constant current of 7.2 A through a solution of NiSO₄ for 90 min is 11.83g.
How much charge will be deposited by equivalent mass?Equivalent mass of any substance will be electroplated by 96485 coloumb of charge.
Equivalent mass of Ni in NiSO₄ = 58.7/2 = 29.35g
So that 96485 coloumb of charge = deposited 29.35g of Ni
Also charge will be calculated by usimg the below equation as:
Q = (I)(t), where
I = current = 7.2 ampere
t = time = 90 min = 5400 sec
Q = (7.2)(5400) = 38,880 coloumb
By using both the equations of coloumb, we calculate the grams of Ni electroplated by 38,880 coloumb charge as:
Mass of Ni = (29.35g)(38,880/96,485)
Mass = 11.826 grams = 11.83g
Hence required mass of nickle is 11.83 grams.
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An unknown substance is found to have a high melting point. In addition, it is a poor conductor of electricity and does not dissolve in water. The substance most likely contains
Answer:
It contains lonic crystals
Explanation:
Assume that the mass of the Cu electrode changes by x grams in a certain period of time. Write a mathematical expression for the change in mass of the Zn electrode during the same period of time.
Assuming the quantity of current passing through the zinc and copper electrolytes is the same, mass of Zinc deposited is (x/64) × 65.0 g.
What is electrolysis?Electrolysis is the decomposition of a substance known as an electrolyte when electric current is passed through its solution or molten form.
The mass of an electrolyte deposited when current is passed is dependent on the current and the charge on the ion.
In the electrolysis of copper and zinc, assuming the quantity of current passed through their solution are the same, the moles of each zinc and copper deposited will be the same since the charges on their ions are the same.
Assuming x g of copper is deposited.
molar mass of copper = 64.0 g
molar mass of Zinc = 65.0 g
moles of copper deposited = x/64
moles of zinc deposited = x/64
mass of Zinc deposited = (x/64) × 65.0 g
Therefore, the mass of Zinc deposited is (x/64) × 65.0 g.
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How many grams of oxygen gas occupy 12.3 L of space at 109.4 kPa and 15.4oC?
Show all work and include units for each number.
Use sig fig rounding on your answer.
17.93 grams of oxygen gas occupy 12.3L of space at 109.4 kPa and 15.4°C. Details about how to calculate mass can be found below.
How to calculate mass?The mass of a given gas can be calculated by multiplying the number of moles of the substance by its molar mass.
However, the number of moles of the gas must be calculated first as follows:
PV = nRT
Where;
P = pressure = 1.0796941atmV = volume = 12.3Ln = number of molesT = temperature = 288.4K R = gas law constant = 0.0821 Latm/molK1.079 × 12.3 = n × 0.0821 × 288.4
13.27 = 23.68n
n = 13.27/23.68
n = 0.56mol
Mass = 0.56 × 32
mass of oxygen gas = 17.93g
Therefore, 17.93 grams of oxygen gas occupy 12.3L of space at 109.4 kPa and 15.4°C.
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Given the following reaction: 2NH3(g) + 3Cl2(g) → N2(g) + 6HCl(g)? How many grams of chlorine must react to produce 16 L of nitrogen gas at 1.2 ATM and 23 °C?
Consider the N₂ gas produced:
Pressure, P = 1.2 atm
Volume, V = 16 L
Gas constant, R = 0.08206 L atm / (mol K)
Temperature, T = (273 + 23) K = 296 K
Gas law: PV = nRT
Then, n = PV/(RT)
No. of moles of N₂, n
= 1.2 × 16 / (0.08206 × 300)
= 0.79 mol
According to the given equation, mole ratio Cl₂ :
N₂ = 3 : 1
No. of moles of Cl₂ needed
= (0.79 mol) × 3
= 2.37 mol
Mass of Cl₂ needed
= (2.37 mol) × (35.5 × 2 g/mol)
= 168 g
Convert 2500 calories to kilocalories or nutritional calories
Answer:
2.5 kilo calories
Explanation:
1 Calories = 0.001 Kilocalories
10 Calories = 0.01
Kilocalories 2500
Calories = 2.5 Kilocalories
Answer:
2.5 kilocalories.
Explanation:
2500 divided by 100 to get to kilo is 2.5
Who developed the first scientific atomic theory?
Answer:
John Dalton
Explanation:
John Dalton (1766-1844) is the scientist credited for proposing the atomic theory. This theory explains several concepts that are relevant in the observable world.
Devices that are made to replace injured or damaged body parts are called
• A. Prosthetic devices
• B. Scaffolds
C. Genetically engineered devices
D. Artificial intelligence
Answer:
Prosthetic Devices
Explanation:
I’m a genius and it’s the answer :D
I need help ASAP!!!!!!!!!!!!!!!!!!!
last one? don't take my word though
Explanation:
the suns heat is related to nuclear fusion
name the 6 properties of water and an example of each
Answer:
High Polarity
Lower Density Of Ice The reason icebergs are floating on the sea surface is because of this lower density. ...
High Heat Of Evaporation When water starts evaporating off of a surface, it creates an effect of cooling. ...
High Specific Heat Water manages to stay liquid because of two of its properties, high specific heat, and its high heat of vaporization. ...
Attraction To Other Polar Molecules The property of cohesion allows liquid water to have no tension on the surface.
Explanation:
The brain and spinal cord work together to allow the body to think and react to the environment.
What is the spinal cord?
a cell
a tissue
an organ
an organ system
Answer:
B . a tissue
Explanation:
1. Which of the following are biotic factors in an ecosystem? *
O Rain, sunlight, and plants
O Plants, animals, bacteria
O Temperature, animals, plants
O Animals, minerals in the soil, rain
Answer:
plants animals bacteria
which of the following pairs would have larger size ? Explain your answer
a) k or k+
b) Br or Br-
c) O2- or F-
Answer:
k
br-
o2- ion
Explanation:
a/k ion has a larger size than k+ ion bc of the size of the radius it is always smaller compared to the parent ion .
b/bc it is an anion and it always has a large size compared to the parent ion (the same thing as the first one)
c/both the anions are isoelectornic species .Since the nuclear charge of O2- ions is small,its size is therefore more than the F- ion
If the order of a reaction with the regard to reagent A is 2, when the concentration of A doubles, the rate will
Answer:
Rate will double
Explanation:
Since the concentration of A is doubling the rate of reaction will also double, since in this scenario concentration is proportional to rate of reaction. So if the concentration of A were to triple the rate of reaction would also triple.
SnO2 + 2H2Sn + 2H2O
If you form 42.5g of H2O from the above reaction, how many moles of H2 were present at
the start of the reaction
Answer: 2.36 moles
Explanation:
Using 1 g/mol for the atomic mass of hydrogen and 16 g/mol for the atomic mass of oxygen, we get that the gram-formula mass of water is 1(2)+16=18 g/mol. Thus, 42.5 grams of water is the same as 2.36 moles.
From the reaction, we know that for every 2 moles of water produced, 2 moles of dihydridotin are consumed. In each mole of dihydridotin, there is 1 mole of hydrogen, meaning that 2 moles of hydrogen are consumed.
Thus, the answer is 2.36 moles.
What else can you use besides vinegar for dying eggs?.
You can use lemon or lime juice as a 1 to 1 replacement for vinegar in egg dye recipes.
For example, if the recipe calls for 1 teaspoon (4.9 mL) of vinegar, use 1 teaspoon (4.9 mL) of lemon or lime juice.
You can use fresh or bottled lemon or lime juice. Both will work the same way.
Hope this helps :))
Interview with tom zambrano why does tom zambrano think that renewable energy science is a good choice for a career?
Zambrano thinks that renewable energy science is a good choice for a career it reproduciable and eco friendly
What is Renewable Energy
Renewable energy science can be defined as the study of the various types of energy that can be reproduced even after been deplited.
Examples of renewable energy is the Solar, Wind, Geothermal Enegy etc.
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This Is the sample response on edge:
There will many opportunities in the field of renewable energy science and engineering. It is an exciting field, with a lot of variety and room for new ideas.
- Have it on edge, Have a good day :)
What is the Molecular Formula for Fiber?
Answer:
Description. Dietary fiber is mostly derived from the plant cell wall. It mainly includes cellulose, hemicellulose, pectic polysaccharides, oligosaccharides, resistant starch, and lignin.
Explanation:
I hope help you and thanks for heart and rate my answer
Which of the designations are accurate for the fatty acid?.
Answer:
Fatty acid is considered unsaturated if it contains at least one double bond. It is called monounsaturated if it contains one double bond and polyunsaturated if it contains more than one double bond.
Explanation:
i hope i helped you
Give an example of a change that the ecosystem was able to recover from and return to equilibrium.
Answer:
The Fox is at the top of the food chain; so, the other animals could increase in population and the fox could return
Moderate drought is an illustration of a shift that the prairie ecosystem was able to adapt to and return to balance. The amount of water that is accessible to both plants and animals reduces during a drought, which affects both plant development and the number of herbivores.
A forest ecosystem can recover from fire because diverse creatures play distinct functions in various ways and locations. Many species' dispersed habitats enable them to resprout or grow from seeds that are ignited by fire, protecting populations from being entirely wiped off.
Ecosystems are living things that are susceptible to a wide range of abiotic and biotic perturbations brought on by the forces of nature and/or human activities.
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Calculate the amount you would measure out if you wanted exactly one mole of each of the following:
Show calculation
a) Uranium
b) Magnesium
Answer:
See below
Explanation:
I do not know the 'calculation ' to find this answer....you should just look at the periodic table of elements
U = 238.02 gm /mole
Mg = 24.305 gm/mole
Does the question want you to weigh out protons neutrons and electrons?
map
What is a possible elevation for point X?
Question 5 options:
1750 m
1550 m
1650 m
1701 m
Answer: 1650 hope i got it in time.
Explanation:
Answer:
C
1650
Explanation:
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