Answer:
Catalyst, in chemistry, any substance that increases the rate of a reaction without itself being consumed. Enzymes are naturally occurring catalysts responsible for many essential biochemical reactions.
Explanation:
Each time the boy breathes, he exhales 0.02231 moles of gas at STP. How many liters of gas does he exhale?
Answer:
The number of liters) the boy exhales is 0.499744 liters
Explanation:
The given parameters of how the boy breathes;
The number of moles of gas the boy exhales, n = 0.02231 moles
The condition in which the boy exhales the gas = STP = Standard Temperature and Pressure
The molar volume of a gas at STP, [tex]V_m[/tex] = 22.4 L per mole
Therefore, the volume of gas the boy exhales, 'V', is give as follows;
V = n × [tex]V_m[/tex]
By substituting the known values, we have;
V = 0.02231 moles × 22.4 L/mole = 0.499744 L
The volume of gas (the number of liters) the boy exhales, V = 0.499744 L.
Which of these organelles is found in a plant cell only
A. Mitochondria
B. Cytoplasm
C. Cellwall
D. Golgi Body
Answer:
c. cellwall
Explanation:
Answer:
C.) Cell Wall
Explanation:
PLZ HELP, I WILL MARK THE BRAINLIEST!!!!
Answer: a. 4
B 2
C 9
Explanation:
1.) How many significant figures are in the following number 0.001040 nm
A.) 3
B.) 2
C.) 5
D.) 6
(If you can pls explain how you got the answer, ty!)
3. A man rode on his motorcycle for 162 miles. His average speed was 45 miles per hour. How long did his trip take?
How would you create a negative charge?
An element has an atomic number of 17. Calculate the mass of an atom of this element. (Avogadro constant is 6.022x10^23 atoms/mol.)
Answer:
2.82 * 10^-25 g
Explanation:
Given that :
Atomic number = 17
Mass of an atom of the element =?
Avogadro's constant = 6.022 * 10^23
The mass of an atom. Of the element is :
Atomic mass / Avogadro's constant
= 17 / 6.022 * 10^23
= 2.82 * 10^-25
=
What makes the periodic table arrangement so unique and useful?
what is the difference between aluminum phosphide and aluminum phosphate?
Answer:
The answer is below
Explanation:
Here some of the difference between aluminum phosphide and aluminum phosphate
1. Aluminum phosphide is a crystalline solid with either dark gray or yellow color. While Aluminum Phosphate is in a nanopowder form but with a whitish color.
2. Aluminum phosphide is used in the fumigation of plants, while Aluminum phosphate is used in cosmetics, paints, etc.
3. Aluminum phosphide has a compound formula of AlP with a molar mass of 57.9552 g/mol, while Aluminum Phosphate has a compound formula of AlO4P with a molar mass of 121.9529 g/mol
In the experiment, you will heat up 50 grams of cold sand and 50 grams of cold water by adding hot water. Will the kind of material—sand or water—affect the temperature change? State your hypothesis.
Answer:
If sand is much denser than water, then the water will warm up faster than the sand. So yes, the kind of material—sand or water—affects the temperature change.
Explanation:
I put this as my answer :)
Good luck!! <3
Yes, the kind of material, water or sand will affect the temperature change in the experiment.
Heat produces temperature change in a body. This is one of the effects of heat. However, the extent of temperature change due to heat depends on the nature of the material. A material that has a high specific heat capacity does not undergo a large change in temperature when heat is added.
Yes, the kind of material, water or sand will affect the temperature change in the experiment. The temperature change of sand will be much higher than the temperature change in water when the same quantity of heat is added because water has a higher specific heat capacity than sand.
Learn more: https://brainly.com/question/8592296?
What is the smallest piece of compound you can have?
Answer:
the answer is molecule
A compound is a substance that consists of two or more elements in a unique composition. The smallest particle of a compound is called a molecule. Chemical bonds hold together the atoms of molecules. Compounds can form only in chemical reactions, and they can break down only in other chemical reactions.
Explanation:
Convert the following Grams: 0.200 moles of H2S
Answer:
6.82 g H₂S
General Formulas and Concepts:
Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableStoichiometry
Using Dimensional AnalysisExplanation:
Step 1: Define
0.200 mol H₂S
Step 2: Identify Conversions
Molar Mass of H - 1.01 g/mol
Molar Mass of S - 32.07 g/mol
Molar Mass of H₂S - 2(1.01) + 32.07 = 34.09 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 0.200 \ mol \ H_2S(\frac{34.09 \ g \ H_2S}{1 \ mol \ H_2S})[/tex]Multiply: [tex]\displaystyle 6.818 \ g \ H_2S[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
6.818 g H₂S ≈ 6.82 g H₂S
5. What energy transformations take place in a simple electric motor?
B. kinetic --> electric
O C. electrical --> kinetic
D. light --> electrical
A. chemical --> solar
Answer:C. electrical --> kinetic
Explanation:
an electric motor converts electrical energy into mechanical energy through the process of electromagnetic induction
Answer:
C
Explanation:
the electric motor converts the electrical power to mechanical power ..
I need help ASAP!! I tried every answer but it’s saying there all wrong !
Determine the number of moles in each of the following:
45.2 g Ag
67.1 g Cr
53.9 g Mn
Determine the number of grams in each of the following:
1.56 mol K
2.5 mol Ba
110 mol He
Determine the mass in grams of each of the following:
5.04 x 1024 atoms N
2.01 x 1024 atoms Ca
8.32 x 1021 atoms Sn
Determine the number of particles contained in each of the following:
50.3 g Cu
145g Si
0.67 g Cl
Answer:
1.) 0.4190298901807947
2.) 1.290481401489745
3.) 0.981105098945202
Determining grams in each of the following
1.) 60.993348000000005
2.) 343.3175
3.) 440.28622000000007
Explanation:
I hope a few of these answers help! :)
Students mixed 20 mL of white glue and 20 mL of water in a cup. They added three drops of food coloring to the mixture. Then, 15 mL of borax solution was stirred into the mixture. Once mixed, the students observed they could take the substance out of the cup and roll it around in their hands. They concluded that –
Hi im here to help!
Answer: a chemical reaction occurred because a new substance was formed with new properties!
Explanation: when u mix glue water and borax it forms into a new substance which is a chemical reaction
The students concluded after mixing the water and glue that;
A chemical change took place because a new substance was formed.
We are told that the students mixed 20 mL of white glue and 20 mL of water in a cup. These two reactants are different and we are told that 15 mL of borax solution was stirred into the mixture.
Now, the three reactants are different and they combined to form a substance that they could roll around their hands.
For them to be able to roll the product around their hands means that a new substance was formed.
In conclusion, we can say a chemical change took place as 3 different substances combined to form a new product which is not reversible like physical change.
Read more about chemical change at; https://brainly.com/question/11987405
An element gains 3 electrons to become stable. What is the new ion's charge?
+3
-3
+5
-5
2) A container has an unknown quantity of gas at a pressure of 61.6 kPa, a volume of 3.9 liters, and a temperature
of 90 °C, how many moles of gas do I have?
3) A container has 23 moles of gas in a container with a volume of 500 liters and at a temperature of 298 K, what
is the pressure inside the container?
4) A barrel has 19 moles of gas at a pressure of 20.5 atm and at a temperature of 25 °C, what is the volume of the
container that the gas is in?
Answer:
3
Explanation:
Carlos is making phosphorus trichloride using the equation below. He uses 15.5 g of phosphorus and collects 50.9 g of phosphorus chloride.
2P +3Cl2 2PCl3
How much chlorine reacted with the phosphorus?
15.5 g
17.7 g
35.4 g
66.4 g
Answer: 35.4 g
2 moles of phosphorous chloride are produced by = 3 moles of
Thus 0.37 moles of phosphorous chloride are produced by= of
Mass of
Thus 35.4 g of chlorine reacted with the phosphorus
Aplant whose seeds are exposed rather than protected by fruit is called sli)
A plant that has Neers and whose seeds are protected by fruit is called sly)
Answer:
Ik Gymnosperms
Explanation:
term that means naked seeds
Answer:
gymnosperm and angiosperm
Explanation:
A high speed train travels 176 miles in 7 hours. What is the speed of the train
in mph? Enter your answer a just a number without units.
Answer:
25 mph
Explanation:
So we have to find the unit rate, or you could use the DTS triangle, but both say you have to divide, so our equation is:
176 ÷ 7 = 25.14
But I'm going to round that
So the train is traveling at 25 mph
hope this helps:/
This is kinda confusing for me
Answer:
Um did you post something I don't see nothing
Explanation:
Urgent please answer properly there are no answer choices.
What is the relationship between land use in general and deforestation?
The term deforestation denotes the change of intended land use from forest to non-forest (urban, agricultural, etc.), as distinct from the cutting of selected tree stems. ... Thus the global net change in forest cover is the sum of all positive and negative changes in forest area (increases and decreases).
I don’t know this question help me please
Why is copper used in the manufacture of computers?
IBM and others are using copper instead of aluminum in the most powerful computer chips they manufacture. Because of copper's superior electrical conductivity, this technology enables conductor channel lengths and widths to be significantly reduced.
Answer: IBM and others are using copper instead of aluminum in the most powerful computer chips they manufacture. Because of copper's superior electrical conductivity, this technology enables conductor channel lengths and widths to be significantly reduced.
please help me..
what is carbon 1/12
Answer:
It is expressed as a multiple of one-twelfth the mass of the carbon-12 atom, 1.992646547 × 10−23 gram, which is assigned an atomic mass of 12 units. ... In this scale 1 atomic mass unit (amu) corresponds to 1.660539040 × 10−24 gram.
PLEASE HELP!!!
How many grams are in 10.11 moles of sucrose?
if atoms are so tiny how do we know they exist
There are three ways that scientists have proved that these sub-atomic particles exist. They are direct observation, indirect observation or inferred presence and predictions from theory or conjecture. Scientists in the 1800's were able to infer a lot about the sub-atomic world from chemistry.
Rank the three types of bonds - ionic, polar covalent and nonpolar covalent - from
strongest to weakest. Justify your answer.
The order of strongest to weakest bond type:
Ionic bond > Polar covalent bond > non polar covalent bond
Explanation:
Ionic bonds are chemicals bonds in which the complete transfer of electrons takes place between a highly electronegative atom and the least electronegative atom.In an ionic bond, there is a strong electrostatic force of attraction due to the formation of two oppositely charged ions.Covalent bonds are chemicals bonds in which the sharing of electrons takes place between atoms with a slight or nil difference in their electronegativities.There are two types of covalent bonds: polar covalent and nonpolar covalent.In polar covalent bonds, due to unequal sharing of electrons partial positive and negative charges are generated.These partial charges give rise to a temporary attractive force of attraction between atoms in polar covalent bonds.In non-polar covalent bonds, equal sharing of electrons between atoms of the same or similar electronegativities.The order from strongest to weakest chemical bond:Strong electrostatic force> temporary attractive force> no force of attraction
Ionic bond > Polar covalent bond > non polar covalent bond
So, from this, we can conclude that the order of ionic bond is the strongest followed by a polar covalent bond and then a nonpolar covalent bond.
Learn more about types of chemical bonds here:
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Which statement best describes comparative and descriptive investigations?
Answer:
they both include a question, procedure and conclusion.
Explanation:
