Answer:
Methane has one atom of carbon and four atoms of hydrogen.
Propane has three carbon atoms and eight atoms of hydrogen.
when food looks bad this type of food spoilage is usually due to
microbial growth
nitrates
organic acids
sulfides
Answer:
microbial growth
Explanation:
food that is not properly kept at a proper temperature bacteria will grow causing spoilage
1
Friction is a force that resists the movement of objects in contact with one another.
This force acts in a specific vector to the direction of motion. Which way is it?
A. Opposite
B. The same
C. The direction of push
D. The direction of pull
Answer:
A
Explanation:
Friction is a force that opposes motion.
which substance cannot be decomposed by a chemical change
Answer:
Nonbiodegradable substance
is the moon bigger than neptune
Answer:
Neptune is bigger than the moon
Explanation:
The circumference of the moon is 6,783.5 miles
The circumference of Neptune is 96,129 miles
This means neptunes circumference is about 14 times the size of the moons
at a fixed temperature and pressure, a cylinder contains equal volumes of o2 and an unknown gas, weighing 20.0 g and 17.5 g respectively. what is the identity of the unknown gas?
At a fixed temperature and pressure, a cylinder contains equal volumes of O2 and an unknown gas. The identity of the unknown gas CO.
The number of moles of a given substance is calculated by dividing the mass by the molar mass.
The number of moles of O₂ = [tex]\mathbf{=\dfrac{20.0 \ g}{32 \ g/mol}}[/tex]
= 0.625 moles.
Based on the given assumption, at fixed temperature and pressure;
Let assume that the number of moles of the unknown gas is = 0.625 molesThe molar mass of the unknown gas can be estimated as:
[tex]\mathbf{= \dfrac{mass}{number \ of \ moles}}[/tex]
[tex]\mathbf{= \dfrac{17.5 \ g}{0.625 \ moles}}[/tex]
= 28 g/mol
Therefore, we can conclude that the unknown gas is CO.
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when washing tableware the water temperature should be:
pls help me on this I have 5 minutes left to submit
#1
Heterogenous mixture mean unsimilar substances .
Chicken noodle soyp.salt waterpropane.#2
An element is a substance made of only one type of atoms
Example-Al,Swater has a density of 1.0 g/mL. a plastic cup floats when it is placed into a container of water. what can you conclude about the density of the plastic cup? (look at the picture)
I need help pleaseee!!!!!!!! Fast
Answer:
C.) 1700 Pa
Explanation:
300 k - 0.3 m^3 = 17000
Imagine that you traveled to the Moon for a vacation and discovered that your weight is different there. How would your weight be different on the Moon than on Earth? Why would it be different? Does this mean that you ""lost weight"" and need to buy new clothes that fit? Why or why not?
Answer
No you did not lose weight.
Explanation:
Weight is the force acting on an object, Gravity is a force on earth which does not apply to the moon so your weight may change depending in where you are but your mass will stay the same because mass measures the matter of an object ITSELF! Have a nice day....
Answer:
I would take my weight on Earth and divide it by 6. I'd weigh less because the gravitational pull on the Moon is less, and, weight is the measure of gravitational pull. I wouldn't "loose weight" because I'd weigh the same on Earth as I did the day I left (give or take a few pounds).
Explanation:
Someone pls help me I will make you brain
Answer:
A
Explanation:
Answer:
It's the first one I think "it absorbs the other greenhouse gases and becomes more potent
Please helpp!! I give brainliest!
Answer:
Volume is cut in half
Explanation:
• From boyles gas law
[tex]{ \rm{P \: \alpha \: \frac{1}{V} }} \\ \\ { \rm{P _{1}V _{1} = P_{2}V _{2} }}[/tex]
P is pressureV is volume[tex]{ \rm{(1 \times V _{1}) = (2 \times V _{2})}} \\ \\ { \rm{ \frac{V _{2}}{V_{1}} = \frac{1}{2} }} \\ \\ { \boxed{ \rm{V_{2} : V _{1} = \frac{1}{2} }}}[/tex]
KI + Pb(NO3)2 → Pbl2 + KNO3
This chemical reaction represents the reaction of
potassium iodide (KI) and lead nitrate (Pb(NO3)2) to
form lead iodide (Pbl2) and potassium nitrate (KNO3).
When correctly balanced, the coefficient for lead iodide
will be_________.
Select one:
3
6
2
The balanced for the reaction is:
2KI + Pb(NO₃)₂ → Pbl₂ + 2KNO₃
When the equation is balanced, the number of atoms for each element on both the reactant and product sides of the equation are equal. This can be seen below:
Reactant Product
K 2 2
I 2 2
Pb 1 1
N 2 2
O 6 6
a model of an atom shows eight electrons in rings that represent different energy levels. how many electrons are in each energy level?
Answer:
1. four in the first energy level, four in the second energy level
2. eight in the first energy level, zero in the second energy level
3. zero in the first energy level, eight in the second energy level
4. two in the first energy level, six in the second energy level *
Explanation:
1. four in the first energy level, four in the second energy level
2. eight in the first energy level, zero in the second energy level
3. zero in the first energy level, eight in the second energy level
4. two in the first energy level, six in the second energy level *
what is the molar mass of dimethylglyoxime, c4h8n2o2?
Answer: 116.12 g/mol
Explanation:
The molecular mass of a formula unit of dimethylglyoxime is calculated as 116 g/mol.
What is molecular mass?The molecular mass can be given as the sum of the mass of each element in the formula unit of the compound.
The dimethylglyoxime is the compound with molecular formula, [tex]\rm C_4H_8N_2O_2[/tex].
The mass of each element in the compound is:
Carbon = 12 gramsHydrogen = 1 gramsNitrogen = 14 gramsOxygen = 16 gramsSubstituting the mass in the formula unit of the compound as:
[tex]\rm C_4H_8N_2O_2=4(carbon)+8(hydrogen)+2(nitrogen)+2(oxygen)\\ C_4H_8N_2O_2=4(12)+8(1)+2(14)+2(16)g\\ C_4H_8N_2O_2=116\;g[/tex]
The molecular mass of dimethylglyoxime is 116 g/mol.
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Question
A student measures the distance between points A and B. The student uses a stopwatch to measure the time taken to travel from point A
to point B. Which equation helps the student to calculate the speed at which an item travels?
Question
O Speed =
Distance
Time
Questio
O Speed =
Time
Distance
Questio
O Speed = Distance x Time
O Speed = Distance + Time
Answer:
Speed = Distance × Time
A× B
1.What is another term for the 24 hour clock?
Answer:
military time
Explanation:
military time
Ned help with this question
PLEASE HELP i have medical issues and i am behind
Only one of the following is a characteristic of a heterogeneous mixture
a. composition is uniform throughout the mixture
b. contains two or more phrases
c. is a pure substance
d. the mixture composition is always the same
Answer:
b contains 2 or more phases
A superficial dermal erythema that is classified as an exanthem is more commonly known as a(n) __________
Answer:
ITS CALLED RASH
Explanation:
earth has two movements in space what are they called ?
Do you think acid rain makes new substances? (CER)
Not all chemical reactions are spectacular. They do not always involve substances that you think of as chemicals like the ones in the lab or in acid rain. ... When molecules of sulfenic acid get to your eyes, they can react with the water in your eyes to produce a new substance, a form of sulfuric acid.
The method of converting from an
amount of one substance to an
amount of another substance using a
balanced chemical equation.
Explanation:
one substance
+one substance=balanced of chemical equation
Which of these is caused by bacteria? A) tuberculosis B) influenza C) the common cold D) chicken pox
Answer:
The answer is A Tuberculosis
A student in lab is determining the density of beads of an unknown metal using displacement by volume. The beads are added to an empty beaker (82.0 g) and with the metal beads it weighs 205.5 g. The beads are poured out into a graduated cylinder containing 60.9 mL of water and the water rises to 70.8 mL mark. What is the density of the metal beads in g/mL?
a. 0.34
b. 0.08
c. 12.47
d. 2.90
e. 1.74
The density of the metal beads is 12.47 g/mL (option c).
1. Determine the mass of the metal beads:
Mass of beaker + metal beads = 205.5 g
Mass of empty beaker = 82.0 g
Mass of metal beads = (Mass of beaker + metal beads) - (Mass of empty beaker)
= 205.5 g - 82.0 g
= 123.5 g
2. Determine the volume of water displaced by the metal beads:
Initial volume of water in the graduated cylinder = 60.9 mL
Final volume of water in the graduated cylinder = 70.8 mL
Volume of water displaced = Final volume - Initial volume
= 70.8 mL - 60.9 mL
= 9.9 mL
3. Calculate the density of the metal beads:
Density = Mass / Volume
Density = 123.5 g / 9.9 mL
Density = 12.47 g/mL
Therefore, the density of the metal beads is 12.47 g/mL (option c).
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Air pressure is greatest near the surface of the Earth in the _______.
Question 7 options:
Thermosphere
Mesosphere
Troposhere
Exosphere
which element has a larger atomic radius than sulfur?
why are metals not used on transistors and integrated circuits
Answer:
The usage of gold is generally avoided in semiconductor technology, since it acts as a deep-level trap and recombination center, i.e. charge carriers of opposite sign do recombine at Au defects in Si and get lost to the current.
How many elements are in the compound calcium carbonate?
Answer: Calcium carbonate contains 3 elements, calcium, carbon, and oxygen. The formula is CaCO3.
Explanation:
Answer:
There are 3 elements.
Explanation:
The formula for calcium carbonate is CaCO3. The elements in it are Calcium, Carbon, and Oxygen.
Think of a time you might have used the scientific method without even realizing it.
Answer:
when i exist
Explanation: