Answer:
Sodium hydroxide is deliquescent (absorbs moisture from the atmosphere) solid. It cannot be weighed accurately. Therefore, it is not possible to prepare a standard solution of sodium hydroxide of accurately known concentration by weighing NaOH.
Iron sulfide is a compound. It is made by heating a mixture of iron and sulfur.
Describe and explain the differences between iron sulfide and a mixture of iron and sulfur.
Answer:
Here are some of the differences between a mixture of iron and sulfur, and iron sulfide: the mixture can contain more or less iron, but iron sulfide always contains equal amounts of iron and sulfur. the iron and sulfur atoms are not joined together in the mixture, but they are joined together in iron sulfide.
Explanation:
Q1; ___________ have almost half a set of electrons in the outer most energy level.
1- metalloids
2- metals
3- nonmetals
Q2;________ are known to be gasses at room temperature.
1- nonmetals
2- metalloids
3- metals
Answer:
2 metalliods....
1 metals
HELP ME!!
If a water molecule (H20) has two hydrogen atoms and one oxygen atom, how would you describe the make-up of a carbon dioxide molecule (C02)?
1 carbon atom, 1 oxygen atom
1 carbon atom, 2 oxygen atoms
2 carbon atoms, 2 oxygen atoms
2 carbon atoms, 1 oxygen atom
Answer:
2
Explanation:
The Quantum Mechanical model of electrons within an atom says______________
Answer:
See explanation
Explanation:
According to the wave mechanical model of the atom, electrons in the atom exhibit wavelike properties.
Unlike in Bohr's model where electrons were believed to be found in orbits of specified energy, electrons are found in orbitals which are defined as regions in space within which there is a high probability of finding an electron in accordance with the Heisenberg uncertainty principle.
An orbital is described by four sets of quantum numbers.
What is the charge for the cation in MnS2
Which of the following is not a form of precipitation?
A
groundwater
B
balls of hail
C
sleet
D
snowflakes
A.
Reason: cuz i need points noob
As stars get older, before they collapse, they throw off dust, heavy atoms and other materials an form a new
A. Constellation
B. Star
C. Rain cloud
D. Nebula
Answer:
B or D
Explanation:
.....I'm pretty sure I earned on some kids tv show
A 13.9 - g piece of metal ( specific heat capacity is 0.449 /g^ C)who whose temperature is 54.2 degrees * C was added to a sample of water at 13.4 degrees * C in a constant - pressure calorimeter of negligible heat capacity . If the final temperature of the water is 15.6 °C, calculate the mass of the water in the calorimeter .
Answer:
26.2g = Mass of water in the calorimeter
Explanation:
The heat absorbed for the water is equal to the heat released for the metal. Based on the equation:
Q = m*C*ΔT
Where Q is heat, m is the mass of the sample, C is specific heat of the material and ΔT is change in temperature
Replacing we can write:
[tex]m_{metal}*C_{metal}*dT_{metal}=m_{water}*C_{water}*dT_{water}[/tex]
13.9g * 0.449J/g°C * (54.2°C-15.6°C) = m(H₂O) * 4.184J/g°C * (15.6°C-13.4°C)
240.9J = m(H₂O) * 9.2J/g
26.2g = Mass of water in the calorimeterCalculate the volume, at STP, of a 0.950 g sample of Carbon Monoxide gas, CO.
Answer:
0.76L is the pressure of CO at STP
Explanation:
To solve this question we must use combined gas law:
PV = nRT
Where P is the pressure of the gas (1atm at STP)
V is volume (Our incognite)
n are moles of the gas (0.950g * (1mol/28g) = 0.034 moles
R is gas constant (0.082atmL/molK)
T is absolute temperature (273.15K at STP)
V = nRT/P
V = 0.034mol*0.082atmL/molK*273.15K / 1atm
V = 0.76L is the pressure of CO at STP
Which best describes the effect of a ecosystem when populations of white-tailed deer are overhunted by people in an area?
A. It disrupts the balance between predators and prey
B. It decreases the amount of producers
C. It directly increases the population of decomposers
D. It decreases competition for food among carnivores
Answer:
A. It disrupts the balance between predators and prey
Explanation:
The effect on the ecosystem when populations of white - tailed deer are overhunted is that it disrupts the balance between predators and prey within the ecosystem.
The whited - tailed deer is the usually the prey. The carnivores are the cats and other flesh eating animals. When the deer is over-hunted, there are more predators compared to prey. This leads to a serious imbalance and a high level of competition for the scarce prey.
Which of the following is a mechanical wave?
a
An X-ray taking photos of your bones with X-rays
b Ocean waves crashing on the shore
CUV rays giving you a sunburn
d A microwave oven heating food with microwaves
e
Radios picking up radio waves
Answer:
I think A and D and E
Explanation:
that is an example of mechanical wave
what do igneous rocks become when they break down and settle into layers?
Answer:
Sedimentary rocks
Explanation:
Igneous rocks will become sedimentary rocks when they break down and settle into layers .
Igneous rocks are rocks that are formed by the cooling and solidification of magma within or on the earth crust.
When agents of weathering and denudation forces acts on a rock body, they break them down producing sediments in the process.
Sediments are transported into depositional basins where they are laid down and cemented together. This in turn forms sedimentary rocks. The break down and settling of sediments leads to the formation of sedimentary rocks.Mendeleev's proposal of periodic table was based on:
The proposal of the periodic table was based upon properties that appeared with some regularity by laying out the elements from lightest to heaviest.
[hope this is helpful!:))]
To locate objects in their environments, bats in flight and porpoises under water both use ultrasound waves with frequencies that are beyond human hearing. These animals produce an ultrasonic wave and then detect echoes from nearby objects in order to determine the location of the object Porpoise Bat If a porpoise and a bat both produce ultrasonic waves when they are 16 meters from an object, which animal would hear its echo first? The bat would hear its echo first because sound travels faster in air than in water. O The porpoise would hear its echo first because sound travels faster in water than in air. O The bat would hear its echo first because the frequency of sound waves is greater in air than in water 0 The porpoise would hear its echo first because the frequency of sound waves is greater in water than in air.
Answer: The porpoise would hear its echo first because sound travels faster in the water than in air.
Explanation:
Help me with this pls
1.2 dkg to grams now I have to say extra stuff for it to submit
Answer:
12 grams and I have to write something longer so just ignore this
why is it important that the level of the sea water does not go above the level of the filter paper
Answer:
The water (the substance) that passes through the filter paper is called the filtrate. If your mixture is a solution, such as salty water, then filtering will not separate the salt from the water. Instead, by heating the soluton the solvent (water) evaporates leaving the solid (salt) behind.
Explanation:
Calculate the pH of the following?
a) 0.12 M NaNO2
b) 0.10 M CH3NH3Cl
c) .45 M NaOCl?
For species that reproduce asexually, all their offspring are
A. genetically identical
B. genetically different
C. almost identical
D. slightly different
Answer:
A. genetically identical
Explanation:
Asexual reproduction produces offspring that are genetically identical to the parent because the offspring are all clones of the original parent. A single individual can produce offspring asexually and large numbers of offspring can be produced quickly
All the offspring that are produced in the process are genetically identical.
When we talk about this mode of reproduction, we talk about a mode of reproduction in which an organism reproduces without the fusion of gametes. This occurs essentially by cell division.
When this occur, there is no crossing of genetic material as such, all the offspring that are produced in the process are genetically identical.
Learn more about reproduction:https://brainly.com/question/1301963
How many milliliters of an aqueous solution of 0.222 M manganese(II) iodide is needed to obtain 9.57 grams of the salt?
Answer:
139 mL
Explanation:
Given data:
Volume of solution required = ?
Molarity of solution = 0.222 M
Mass of salt = 9.57 g
Solution:
Number of moles of manganese iodide:
Number of moles = mass/molar mass
Number of moles = 9.57 g/ 308.75 g/mol
Number of moles = 0.031 mol
Volume required:
Molarity = number of moles of solute / volume in L
0.222 M = 0.031 mol / V
V = 0.031 mol / 0.222 mol/L
V = 0.139 L
Volume in mL:
0.139 L ×1000 mL / 1 L
139 mL
HELP HELP IM FAILING PLZ HELP ME
What is the formula mass of calcium nitrate tetrahydrate (Ca (NO3)2 · 4H0]?
Be sure to add the water of hydration, which is the 4H2O part (water surrounding the calcium
nitrate).
102 g/mol
164 g/mol
174 9/mol
236 g/mol
Answer:
236 g/mol
Explanation:
This question is asking to calculate the molar mass/formula mass of calcium nitrate tetrahydrate with the chemical formula: Ca(NO3)2 · 4H20. This is done as follows:
Atomic mass of the constituent elements are as follows:
Ca = 40
N = 14
O = 16
H = 1
Hence, in Ca(NO3)2 · 4H20.
= 40 + {14 + 16(3)}2 + 4 {1(2) + 16}
= 40 + {14 + 48}2 + 4{2 + 16}
= 40 + {62}2 + 4{18}
= 40 + 124 + 72
= 236
Hence, the molar mass of Ca(NO3)2 · 4H20 is 236g/mol.
Answer:
236 g/mol
Explanation:
please helppp!!
How do ion charges differ
for the fourth main group
column and the transition
metals?
Answer:
How do ion charges differ for the fourth main group column and the transition metals? Do not have common charges. Transition metals tend to form positive ions, but the number of electrons that are lost varies. Describe how atoms with a large difference in electronegativity form ionic bonds.
Explanation: ?
Identify processes that change matter to a liquid state
the question is a picture pls help
The unknown alcohol = 2-propanol
Further explanationGiven
volume = 50 ml
mass = 39.4 g
Required
The unknown alcohol
Solution
Density of sample :
= mass : volume
= 39.4 g : 50 ml
= 0.788 g/ml
The unknown alcohol at room temperature = liquid, so the unknown alcohol is 2-propanol because it has temperature range between -90 to 82 for liquid and the density = 0.788 g/ml
Can anyone explain and answer?
Which physical change are both exothermic
A)condensation and evaporation
B)evaporation and melting
C)freezing and condensation
D)melting and freezing
Answer:
I would say C.)
Explanation:
Freezing and condensation are both ways that heat is let out from an object.
Fe0 + 2H+1 Cl-1 → Fe+2 Cl2 -1 + H20 ↑
De acuerdo con la ecuación planteada si se cambia el hierro Fe por dos moles de sodio Na0 probablemente formará
A. 2NaCl + H2
B. NaCl + H2
C. 2NaH + Cl2
D. NaCl2 + H2
Answer:
A and the answer if we can manage by its formula NaCl H2 but the answer is A
What is the name of the ionic compound with the formula:
AlF3
Answer:
potassium chloride.
A metal can form
A.
a stable nucleus
B.
an anion
C.
a new family
D.
a cation
Osmium metal, the densest element, has a density of 22.6 g/mL, while hydrogen, the least dense element, has a density of 8.99 e-5 g/mL. Calculate the volume occupied by 1.00 g of each element. How many times more dense is osmium than hydrogen?
Answer:
1. Volume of osmium = 0.044 mL
2. Volume of Hydrogen = 11123.47 mL
3. Osmium is 251390 times denser than hydrogen
Explanation:
From the question given above, the following data were obtained:
Density of osmium = 22.6 g/mL
Density of Hydrogen = 8.99×10¯⁵ g/mL
Mass of osmium = 1 g
Mass of Hydrogen = 1 g
1. Determination of the Volume of osmium.
Density of osmium = 22.6 g/mL
Mass of osmium = 1 g
Volume of osmium =?
Density = mass /volume
22.6 = 1 / volume
Cross multiply
22.6 × volume = 1
Divide both side by 22.6
Volume = 1 / 22.6
Volume of osmium = 0.044 mL
2. Determination of the Volume of Hydrogen.
Density of osmium = 8.99×10¯⁵ g/mL
Mass of osmium = 1 g
Volume of osmium =?
Density = mass /volume
8.99×10¯⁵ = 1 / volume
Cross multiply
8.99×10¯⁵ × volume = 1
Divide both side by 8.99×10¯⁵
Volume = 1 / 8.99×10¯⁵
Volume of Hydrogen = 11123.47 mL
3. Determination of the number of times osmium is denser than hydrogen.
Density of osmium (Dₒ) = 22.6 g/mL
Density of Hydrogen (Dₕ) = 8.99×10¯⁵ g/mL
Dₒ / Dₕ = 22.6 / 8.99×10¯⁵
Dₒ / Dₕ = 251390
Cross multiply
Dₒ = 251390 × Dₕ
Thus, osmium is 251390 times denser than hydrogen.
if you had a block square that weighed 5.00 grams what would be the length of each side
Answer:
[tex]l = 0.793[/tex] cm
Explanation:
Let us assume the density of block square [tex]10[/tex] g/cm³
As we know
Volume = [tex]\frac{Mass}{Density}[/tex]
Thus Volume of this block is equal to [tex]\frac{5}{10} = 0.5[/tex]
As we know volume of square block of side of length "l" is equal to [tex]l^3[/tex]
[tex]l^3 = 0.5[/tex]
[tex]l = 0.793[/tex] cm
