How do you write the formula for a compound made from Fe 3+ and OH -1 ions?
a: FeOH
b: Fe3OH
c: FeOH3
d: Fe (OH)3
How many moles would be equal to 22.4 g of CO2?
Answer:
Number of moles = 0.51 mol
Explanation:
Given data:
Mass of CO₂ = 22.4 g
Number of moles = ?
Solution:
Number of moles of CO₂:
Number of moles = mass/molar mass
Molar mass of CO₂ = 44 g/mol
by putting values,
Number of moles = 22.4 g/ 44 g/mol
Number of moles = 0.51 mol
What is a compound formed by the sharing of electrons called? I NEED THIS DONE RIGHT NOWWW
Answer:
Covalent bonds
Explanation:
Answer:
Covalent bonds
Explanation:
Covalent chemical bonds involve the sharing of a pair of valence electrons by two atoms.
Hope this helps :)
Which type of wave is shown in the image?
The type of wave is shown in the image is transverse wave and the correct option is option B.
What are Transverse waves?A transverse wave is a wave in which particles of the medium vibrate at right angles, or perpendicular, to the direction that the wave travels.
Transverse waves commonly occur in elastic solids, oscillations, in this case, are the displacement of solid particles from their relaxed position, in the direction perpendicular to the propagation of the wave.
Transverse waves can travel through empty space as electromagnetic waves or be mechanical waves.
Therefore, The type of wave is shown in the image is transverse wave and the correct option is option B.
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salt water
pure substance
element
homogeneous mixture
heterogeneous mixture
compound
solution
Answer:
salt water heterogeneous mixture , pure substance compound,element solut8on
if input energyis 100J and useful is 70J what is the waste energy
Answer:
waste energy = 30 J
Explanation:
Given that.
Input energy = 100 J
Useful energy = 70 J
We need to find the amount of waste energy.
Waste energy = total energy - used energy
= 100 J - 70 J
= 30 J
Hence, 30 J of energy is waste energy.
pls helpp
An unknown substance with a mass of 23.5 grams absorbs 419.7 J while undergoing a temperature increase of 76.0°C. What is the specific heat of the substance?
The specific heat of the substance : c = 0.235 J/g °C
Further explanationGiven
Heat absorbed by substance = 419.7 J
m = mass = 23.5 g
Δt = Temperature difference : 76 °C
Required
The specific heat
Solution
Heat can be formulated
Q = m.c.Δt
Input the value :
419.7 = 23.5 x c x 76
c = 419.7 : (23.5 x 76)
c = 0.235 J/g °C
How does energy change matter?
Answer:
Adding or removing energy from matter causes a physical change as matter moves from one state to another. For example, adding thermal energy (heat) to liquid water causes it to become steam or vapor (a gas). And removing energy from liquid water causes it to become ice (a solid).
Explanation:
Your welcome
Categorize the following reaction: C3H8 + O2 ---> CO2 + H2O *
Synthesis Reaction
Combustion Reaction
Replacement Reaction
Decomposition Reaction
Answer:
it is a replacement reaction
Which of these choices describes a segment of
DNA that determines a specific trait in a person,
such as attached earlobes?
A. a gene
B. a phenotype
C. a chromosome
D. a characteristic
Please help ..
What is an ion? Write its types with example.
Answer:
an ion is an element that carries either positive or negative charge. the example are cation which has a positive charge e.g H+ and anion which had a negative charge eg Cl-.
Name the type of food additive that stops the food reacting with oxygen.
Answer:
Antioxidants such as vitamin C are preservatives by inhibiting the degradation of food by oxygen. Bulking agents such as starch are additives that increase the bulk of a food without affecting its taste.
The point of a cell division is to? a) copy tissue b) common cell c) neuron d) all choices are true
Answer: a) copy tissue
Explanation:
Tissue and cells in general get damaged, or just break down from wear and tear. So the cells divide to make up for this shortcoming, effectively replacing any broken parts with fresh new ones.
Calculate the number grams present in each sample below.
15 moles NO2
Answer:
Ok 15 miles NO2 you need the salt and pepper trick so mix it add water sit in it when you get cold write down uh temperature then you need to get out or it may kill you when it starts to get cold then go to the y- axis then you need to ask your teacher for help after you do the y-axis
56ude67fv67gbubvtyfg help PLS
Answer:
p=5.0g/cm³
Explanation:
density formula
p=m/v
And if im not mistaken the stone weighs 200grams
The Volume of the tube increases by 40
So
p=200/40
p=5.0g/cm³
7. Which of the following is NOT a characteristic that helps define syhthetic materials?
A) made from natural resources
B) underwent a chemical reaction
C) made to fit a specific function
D) made using metal
Answer:
made to fit a specific function
Calculate the current needed to provide 30000C of electricity In 5 minute
Help please
What percentage of the world does not have a reliable source for clean water?
Answer:9%
Explanation:
97
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Where is located the element with the electron
configuration [Kr] 5s? in the periodic table?
Pop se7419 Ford
19725 74
B - In period 5 and group 10
C - In period 4 and group 10
D - In period 5 and group 12
pls help
Gold has a specific heat of 0.129 J/(g . C°). How much energy does a 0.700 gram piece of gold give off as it's temperature cools from 53.0°C to 22.0°C?
Answer:
2.8J
Explanation:
Given parameters:
Specific heat capacity = 0.129J/g°C
Mass = 0.7g
Initial temperature = 53°C
Final temperature = 22°C
Unknown:
Quantity of heat released = ?
Solution:
To solve this problem, we use the expression below;
H = m c Ф
H is the quantity of heat released
m is the mass
c is the specific heat capacity
Ф is the change in temperature
Now,
Insert the given parameters and solve;
H = 0.7 x 0.129 x (22 - 53) = -2.8J
The amount of heat released is 2.8J, the negative depicts the heat released.
6. A family decided to take a trip to Europe. The plane they took flew at an average speed of 500 miles per hour
during the flight. The plane covered a distance of 5,000 miles during the flight. How long was the flight?
Your answer
Answer:
10 hours
Explanation:
Answer:
10
Explanation:
What kind of reaction is this?
1. Synthesis
2. Decomposition
3. Single Replacement
4. Combustion
5. Double replacement
6. Acid-Base
I need to know what is Mitosis ♀️
Answer:
a type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus, typical of ordinary tissue growth.
Explanation:
The picture below shows a sample from a tree.
What kind of tree is this?
Answer:
I believe it is Spruce, because of the shape of the leaves
Answer:
Explanation:
Spruce
What are the two energy of the electrons outside the nucleus
Answer:
Unlike protons and neutrons, which are located inside the nucleus at the center of the atom, electrons are found outside the nucleus. Because opposite electric charges attract each other, negative electrons are attracted to the positive nucleus
Give reasons
has valency
Magnesium
two
a
Answer:
Magnesium has valency equal to 2 +
Explanation:
because the electronic configuration of Mg is [2,8,2]. The nearest noble gas to magnesium is neon with electronic configuration of [2,8], to achieve this stable electronic configuration Mg can lose 2 valence electrons, hence its valency is 2 + .
Which is a property of all atoms?
a. More electrons than protons
b. A nucleus with a positive charge
c. A positively charged electron cloud
d. Same number of protons as neutrons
What is Electron configuration for a tin atom in the excited state and why
When the tin atom is excited, then the tin atom absorbs energy. As a result, an electron in the 5s orbital jumps to the 5pz orbital.
What is meant by tin atom?The electron configuration exists in the distribution of electrons of an atom or molecule in atomic or molecular orbitals.
tin (Sn), a chemical element belonging to the carbon family, Group 14 (IVa) of the periodic table. It is a soft, silvery white metal with a bluish tinge, known to the ancients in bronze, an alloy with copper. Tin is widely used for plating steel cans used as food containers, in metals used for bearings, and in solder.When the tin atom is excited, then the tin atom absorbs energy. As a result, an electron in the 5s orbital jumps to the 5pz orbital.
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All of the following statements are true except:
Schist is an example of metamorphic rock.
Metamorphic rocks are formed under heat and pressure.
All metamorphic rocks come from parental rocks.
Metamorphic rocks can also be formed in ocean floors.
Answer:
Metamorphic rocks can also be formed in ocean floors.
Explanation:
The ocean floor is made up predominantly of basalts and are derived by the cooling an solidification of magma in this environment.
The ocean floor is made up primarily of igneous rocks and some sediments that have been deposited from the surface. Also, materials from deep within the subsurface can reach the ocean floor where they cool and solidify to form igneous rocks. Schists are examples of metamorphic rocks as well as gneiss.Answer: a is incorct
Explanation:
A 4.50 g sample is analyzed and found to contain 3.22 g of carbon, 0.300 g of hydrogen, 0.221 g of nitrogen, and the rest is oxygen. The molar mass of the actual compound is found to be 285 g/mol. Find the empirical formula and then the molecular formula.
The empirical formula and the molecular formula are the same : C₁₇H₁₉NO₃
Further explanationGiven
3.22 g of carbon, 0.300 g of hydrogen, 0.221 g of nitrogen, and the rest is oxygen.
Required
The empirical formula and then the molecular formula.
Solution
Mass of Oxygen = 4.5 - (3.22+0.3+0.221)=0.759 g
Mol ratio of elements C : H : N : O =
3.22/12 : 0.3/1 : 0.221/14 : 0.759/16 = 0.268 : 0.3 : 0.016 : 0.047
Divide by 0.016 :
16.75 : 18.75 : 1 : 2.9375 = 17 : 19 : 1 : 3
(C₁₇H₁₉NO₃)n = 285
(12.17+19+14+3.16)n = 285
(285)n = 285
n = 1
Then the empirical formula and the molecular formula are the same