Answer:
C
In an exothermic reeaction, the energy of products is less than the energy of reactants.
Explanation:
Answer:
In an exothermic reeaction, the energy of products is less than the energy of reactants.
Explanation:
Darwin developed the theory of evolution. Which of these observation is the best evidence for the theory of evolution?
A) Humans have very diverse traits today.
B) There appear to be missing links in the evolutionary chain.
C) Life on earth has been found to date back billions of years.
D) DNA found in older primate fossils resemble those of humans today.
Answer: It's D
Explanation:A and B cant be it and C has nothing to do with it because it doesnt talk about evolution while D does that the older fossils resemble us
what is a cause of cemical weathering?
A. sunlight
B. wind
C. gravity
D. acids
Answer:
D. acids
Explanation:
I hope this helped
1. List the three states of water shown here.
Answer: solid,liquid & gas
Explanation:
Three states of water
Water in the solid state e.g Ice block
Water in the liquid state e.g fluids
Water in the gaseous state e.g vapour
According to cell theory _____.
Answer:
Every single living thing are comprised of cells. Cells are the fundamental units of structure and capacity in living things. New cells are delivered from existing cells.
Can a chemical reaction happen with only one substance? For example, if you select water as the first substance but you don't add another substance, will a chemical reaction happen or not?
Explanation:
Yes, a chemical reaction can happen with only one substance.
A typical example of such reaction is the radioactive decay.
Radioactive decay is the loss of elementary particles from an unstable nucleus, ultimately changing the unstable element into another more stable element. .
When radioactive elements are let alone, they decompose to form stable harmless elements.
An example of radioactive decay is attached in the image below;
Answer:
No
Explanation:
A chemical reaction cannot happen with water alone. This is because, a chemical reaction must involve collision of particles from different reactants in order to give a product. No chemical specie can react with itself without some kind of interaction with another chemical specie which may or may not enter into the rate equation for that reaction.
Only nuclear reactions are spontaneous and involve only one reactant for spontaneous radioactive decay.
A sample of gas occupied 250.0 mL at 30.0 C. What volume will it have at 60.0 C, assuming the pressure remains constant?
Answer: 274.75 mL
Explanation:
Initial volume of gas V1 = 250.0 mL
Initial temperature of gas T1 = 30.0 C
Convert temperature in Celsius to Kelvin
(30.0°C + 273 = 303K)
New volume V2 = ?
New temperature T2 = 60.0 C
(60.0°C + 273 = 333K)
Since, volume and temperature are involved while pressure is constant, apply the formula for Charles law
V1/T1 = V2/T2
250.0 mL/303K = V2/333K
Cross multiply
250.0 mL x 333K = 303K x V2
83250 = 303V2
V2 = 83250/303
V2 = 274.75 mL
Thus, the volume will be 274.75 mL
When the pressure that a gas exerts
on a sealed container changes
from
torr to 456 torr, the
temperature changes from 150°C
to 75.0°C.
Answer:
554 torr
Explanation:
i got it right on the test.
Answer:
554
Explanation:
A chemist has a sample of hydrated Li2SiF6 and it weighs 0.4813 grams. He heats it strongly to drive off the water of hydration, and after heating, he found that the anhydrous compound has a mass of 0.391 grams. What is the percent of water in the hydrate?
Answer:
percentage of water = 18.76%
Explanation:
A chemist has a sample of hydrated Li2SiF6 and it weighs 0.4813 grams.
The overall weight of the compound is 0.4813 grams.
weight of hydrated sample = 0.4813 grams.
weight of anhydrous compound = 0.391 grams
percentage weight of water = mass of water/mass of the hydrated compound × 100
mass of water = mass of hydrated compound - mass of anhydrous compound
mass of water = 0.4813 - 0.391 = 0.0903 grams.
percentage of water = 0.0903/0.4813 × 100
percentage of water = 9.03/0.4813
percentage of water = 18.761687097
percentage of water = 18.76%
Answer:
18.8%
Explanation:
Step 1:
The following data were obtained from the question.
Mass of hydrated Li2SiF6 = 0.4813 g
Mass of anhydrous Li2SiF6 = 0.391 g
Step 2:
Determination of the mass of the water in the hydrate.
Mass of water = (Mass of hydrated Li2SiF6) - (Mass of anhydrous Li2SiF6)
Mass of water = 0.4813 - 0.391
Mass of water = 0.0903 g
Step 3:
Determination of the percentage of water in the hydrate.
The percentage of water = Mass of water/ mass of hydrate x 100
The percentage of water = 0.0903/0.4813 x 100
The percentage of water = 18.8%
PLEASE ANSWER !!!
2H2 + O2 —> 2H20 + energy
What type of reaction is represented by this equation ?
- decomposition
-double replacement
-Single replacement
-synthesis
Answer: synthesis reaction.
Explanation:
The type of reaction represented by the equation is synthesis reaction.
Definition of synthesis reactionA synthesis reaction is simply defined as reaction in which two or more substances react to produce a single new substance which has characteristics different from the reactants.
Considering the equation given, we can conclude as follow:
2H₂ + O₂ —> 2H₂0 + energy
The reaction is a synthesis reaction since H₂ and O₂ combined to produce a single product i.e H₂O
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C. Which molecule is not linear?
a H₂O
b. CO₂
c. N₂
d. Cl₂
Answer:
I think the answer is
(H2O) water molecule
If 75 ml of water is added to 125 ml of a 0.45 M NaOH solution. what will be the molarity of the diluted solution be?
Vouransion
Answer:
2.25M
Explanation:
C1V1 = C2V2
25×C1 = 125 × 0.45
C1 = 125×0.45/25
C1 = 2.25M
Which sweet tea would you expect to taste the sweetest?
Here is the clear picture
Answer: You're right, it's 8 M
Explanation: The higher the number, the sweater it is.
As the concentration of sugar solute molecules increases, the more sweeter the solution will be. Here, 8 M sugar solution is the sweetest one.
What is molarity?
Molarity of a solution is a term use to represent its concentration. It is the ratio of number of moles of solute to the volume of solution in litres. Molarity is a temperature dependant property.
Higher the number of moles of the solute higher is the molarity. When it made more diluted by adding more volume its concentration decreases thereby molarity.
8 M sugar solution contains 8 moles of sugar molecules per one liter of water. Which is higher in concentration than the other given concentrations and thus having more sweet.
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I swear is it just me or I struggling with science!
help
Explanation:
The term mutualism refers to a relationship in biology or sociology that is mutually beneficial to two living things. This relationship can be within the species, between living things from two different species, between individuals in a society and between two societies.The predator prey relationship consists of the interactions between two species and their consequent effects on each other. In the predator prey relationship, one species is feeding on the other species. The prey species is the animal being fed on, and the predator is the animal being fed.when organisms compete for resourcesto get waterplease like and Mark as brainliestConsider this reaction mechanism: Step 1: Mo(CO)6→ Mo(CO)5 + CO Step 2: Mo(CO)5 + P(CH3)3→ Mo(CO)5P(CH3)3 Which of these is an intermediate
Answer:
Mo(CO)5 is the intermediate in this reaction mechanism.
Explanation:
The reaction mechanism describes the sequence of elementary reactions that must occur to go from reactants to products. Reaction intermediates are formed in one step and then consumed in a later step of the reaction mechanism.
In this reaction mechanism, Mo(CO)5 is the product of 1st reaction and then it is used as a reactant in 2nd reaction. So, Mo(CO)5 is the reaction intermediates.
The overall balanced equation would be,
Mo(CO)6 + P(CH3) ↔ CO + Mo(CO)5 + P(CH3)3
Answer:
In terms of molecularity, Step 1 is
⇒ unimolecular
and Step 2 is
⇒ bimolecular.
Explanation:
EDGE 2023
There are 231.0 grams of Iron (ll) Hydroxide, Fe(OH)2. How many moles of Fe(OH)2 does that equal?
Explanation:
firstly you find for the molar mass of the iron(ii)hydroxide
and then use this formula
mole=mass/molar mass and then slot in your given values
and then you will get
2.57moles
the answer is 2.57 mole of iron(ii)hydroxide
Which are caused by global warming?
a. Extreme weather conditions
b. Displaced animal habitats
C. Sea level rising
d. All of the above
Ethanol is increasingly being used as a fuel for cars.
The standard enthalpy change of formation of carbon dioxide is -393 kJmol.
The standard enthalpy change of formation of water is --286 kJmol.
The standard enthalpy change of formation of ethanol is -277 kJmol.
What is the standard enthalpy change of combustion of ethanol?
Answer:
= -522.5\,\, kJmol^{-1}
Explanation:
Firstly, we know that 0.36 g of ethanol burned, so we can convert this into a number of moles.
Using a formula triangle to calculate the number of moles of ethanol in a 0.36 gram sample
Secondly, we can use \Delta H=cm\Delta T to calculate the enthalpy change in the experiment described in the question (ie when 0.008 moles of ethanol is burned).
\Delta H=cm\Delta T = 4.18 x 0.2 x 5
= 4.18 kJ
Lastly, we can use the enthalpy change for the experiment in the question to calculate the enthalpy of combustion (ie when one mole of ethanol is burned).
0.008\,\,moles\,\,ethanol = 4.18kJ
1\,\,mole\,\,ethanol = \frac{1}{0.008} \times 4.18
= -522.5\,\, kJmol^{-1}
Answer:
-522.5
Explanation:
because for the formula i found that.
Convert 5 moles H2O to liters
how many grams of Fe can be produced if 12 mol CO and 12 mol Fe2O2 are allowed to react?
3CO(g) + Fe2O3(s) ----> 2Fe(s) + 3CO2(g)
Answer:
Assume that:
n = number of moles
m = mass of substance
M = molar mass (equivalent to atomic weight in the periodic table)
n
=
m
÷
M
The mass (m) of Fe is found.
Your next step is to find the molar mass (M) of Fe.
The molar mass of Fe is 55.9 g/mol.
To find the number of moles for Fe:
n = 112 grams
÷
55.9 g/mol = 2.003577818 moles of Fe(don't round because this is not your final answer or you'll get inaccurate final answer)
Hope it helps you
Plz mark brainliest and follow me ❤❤❤❤
Explanation:
How many grams of CO2 are produced from 51 g of CH4?
Answer:
140.25g of CO2
Explanation:
First, let us write a balanced equation showing how CO2 is produced from CH4. This is illustrated below:
When CH4 undergoes combustion it produces CO2 and H2O according to the balanced equation below:
CH4 + 2O2 —> CO2 + 2H2O
Next, let us calculate the mass of the CH4 that reacted and the mass of CO2 produced from the balanced equation. This is shown below:
Molar Mass of CH4 = 12 + (4x1) = 12 + 4 = 16g/mol
Molar Mass of CO2 = 12 + (2x16) = 12 + 32 = 44g/mol
From the balanced equation above,
16g of CH4 produced 44g of CO2.
Therefore, 51g of CH4 will produce = (51 x 44)/16 = 140.25g of CO2.
From the calculations made above, we can see that 51g of CH4 produced 140.25g of CO2
Answer:
139.91 g CO2 to the nearest hundredth.
Explanation:
CH4 + 2O2 ----> CO2 + 2H2O
Using the molar masses of the chemicals:
(12.011 + 4*1.008) g CH4 produces (12,011 + 32) g CO2
So 51 g of CH4 produces [51 * (12,011 + 32] / [ (12.011 + 4*1.008) ]
= 139.91 g CO2.
how many grams of zncl2 will be produced from 32.0 g of zn and 13.0 g of cucl2
Answer: 13.2g of ZnCl2
Explanation:
Vitamin A is a very large organic molecule composed of twenty atoms
of carbon, one atom of oxygen and thirty atoms of hydrogen. How
many atoms total are in TWO molecules of vitamin A.
Select one:
84
68
34
102
Answer:
102
Explanation:
(20+1+30)*2
you add the total number of atoms that can be found in one molecule of vitamin A then multiply by 2
Final answer:
To find the total number of atoms in two molecules of vitamin A, we multiply each type of atom by two and add the totals together, resulting in 102 atoms.
Explanation:
The question is asking to calculate the total number of atoms in two molecules of vitamin A, based on the given composition of one molecule of vitamin A. According to the question, a single molecule of vitamin A contains 20 carbon atoms, 30 hydrogen atoms, and 1 oxygen atom. To find the total number of atoms in two molecules, we simply multiply the number of each type of atom by two and then add up the totals.
For carbon: 20 atoms × 2 = 40 atoms
For hydrogen: 30 atoms × 2 = 60 atoms
For oxygen: 1 atom × 2 = 2 atoms
Adding these together gives us:
40 (carbon) + 60 (hydrogen) + 2 (oxygen) = 102 atoms
Which label best classifies all three of these steps?
A chemical reaction takes place.
Reactants are gathered in chloroplasts.
Energy is used to make food.
Oxygen is produced and stored in the plant.
Answer:
a
Explanation:
a
Answer:
Reactants are gathered in chloroplasts.
Explanation:
Photosynthesis is a process unique to autotrophic organisms like plants. It is the process whereby plants use energy from sunlight to make their own food (chemical substance). The photosynthetic process occurs in two stages in the Chloroplast viz: Light dependent stage and light-independent stage.
In the light dependent stage, the plant captures energy from sunlight via its Chlorophyll pigment and uses it to break down water molecules (H2O) in a process called PHOTOLYSIS OF WATER. This process brings about the electrons and protons needed to form NADPH and ATP molecules respectively. This process occurs in the thylakoid membrane of the CHLOROPLAST.
In the light independent stage, also known as Calvin cycle, the plant uses the NADPH and ATP molecules produced in the light stage to reduce Carbondioxide (CO2), which enters through the stomata of the plant, and power the formation of glucose molecule (C6H12O6).
Hence, based on the steps listed by Jeremy for the photosynthetic process, the gathering of reactants (CO2, H2O and light energy) in the Chloroplast of the plant best classifies those steps
2- A gas has a volume of 500 mL at a temperature of -73.0 °C. What volume will the gas
occupy at 27.0°C?
Answer: 750ml
Explanation:
Using charle's law
V1/T1=V2/T2
V1= 500ml
T1= -73⁰C
V2= ?
T2=27⁰C
We can see that the temperature is in Celsius
Now,we will convert to Kelvin
Kelvin= 273+ Celsius
So convert the Celsius value to Kelvin
For T1= 273+(-73)
T1= 273-73
T1= 200K
For T2= 273+27
T2= 300K
V1/T1=V2/T2
500/200=V2/300
Cross multiply
200×V2=500×300
200V2= 150000
V2= 150000/200
V2= 750ml
So,
750ml of gas will occupy at 27⁰C
Answer:
750mL
Explanation:
Charles law states that the volume of a fixed mass of gas is inversely proportional to its temperature, at constant pressure
Mathematically,
V1/T1 = V2/T2
Values given are;
V1=initial volume of the gas=500mL
T1=initial temperature of the gas=-73.0°C=(-73.0+273)K=200K
V2=final volume of gas
T2=final temperature of gas=27.0°C=(27.0+273)K=300K
The volume of the gas at 27°C is unknown.
We'll make V2 subject of the formula
V1/T1=V2/T2
V2=(V1×T2)/T1
V2=(500×300)/200
V2=750mL
Therefore, the gas will occupy a volume of 750mL at 27.0°C
How does matter move and change through photosynthesis??
Final answer:
Photosynthesis transforms carbon dioxide and water into glucose and oxygen using sunlight energy. This process adheres to the law of conservation of mass, reflecting the transformation of matter without any loss. The resulting carbohydrates are moved within the plant through the phloem, driven by osmotic forces.
Explanation:
How Matter Moves and Changes Through Photosynthesis
Photosynthesis is the biological process that allows plants to convert light energy into chemical energy. During this process, matter in the form of carbon dioxide and water is transformed into glucose and oxygen. Energy from sunlight energizes electrons which, in turn, facilitate the production of energy-carrying molecules like NADPH and ATP during the 'light cycle'. This energy is then used in the Calvin Cycle, or 'dark cycle', to fix carbon dioxide from the atmosphere into glucose, a process that is vital for the cycling of matter and flow of energy through ecosystems.
The law of conservation of mass dictates that the amount of matter remains constant in this process. So, the uptake of carbon dioxide and water and the release of oxygen and glucose reflect a transformation, not a loss of matter. These biochemical processes of photosynthesis support life on Earth, as they produce the basic nutrients that form the foundation of the food chain and release oxygen that is essential for the respiration of most living organisms.
Carbohydrates like sucrose, synthesized during photosynthesis, are then transported from the sites of production to where they are needed within the plant through the phloem. This movement is driven by osmotic forces that arise due to variations in solute concentrations, thus showing how matter moves within the plant system.
The most highly concentrated hydrochloric acid is 12 M. What volume of a 12 M stock solution of HCL should be diluted in order to produce 6.0 L of 0.50 M HCL?
A. 1.0 L
B. 3.0 L
C. 250 mL
D. 500 mL
The volume of that 12M stock solution of HCL must be diluted to generate 6.0 L of 0.50 M would be:
C). 250 mL
Find the volumeGiven that,
Stock solution of HCL = 12 M
Amount of HCL to be produced = 6.0 L of 0.50 M
To find,
The volume of stock solution = (0.5 × 6)/12
= 0.25 l
By converting 0.25 liters into ml,
= 0.25 × 1000
= 250 ml
∵ 250 ml is the amount of HCL required.
Thus, option C is the correct answer.
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if you have 0.5 grams of CaCl2 dissolved to make 15mL of solution, what is the molarity of the solution?
Answer:
0.3M
Explanation:
Molarity of a solution is given by;
M=n/v
Where;
n= number of moles of solute = mass of solute / molar mass
v= volume of solution
n= mass of CaCl2 / molar mass of CaCl2
Mass of CaCl2 = 0.5
Molar mass of CaCl2 = 40 + (2×35.5)
= 111g/mol
n = 0.5/111 = 0.0045mol
volume, v= 15mL = 15/1000 L = 0.015L
Note that molarity is in mole per liter, hence we convert 15mL to L. 1mL=1/1000L
M =0.0045/0.015
M=0.3mol/L
Therefore, the molarity of the solution is 0.3M
What physical property of materials depends on the ability of electrons to move
easily?
A Solubility in water
B Electrical conductivity
C Low melting point
D Brittleness
The physical property that depends on the ability of electrons to move easily is electrical conductivity, which is characteristic of materials like metals that are good conductors of electricity.
B is correct
Explanation:The physical property of materials that depends on the ability of electrons to move easily is electrical conductivity. Materials with high electrical conductivity, such as metals, allow electrons to flow through them with ease, facilitating the flow of electric current.
Examples include silver and copper, which are widely used in electrical wiring and components due to their excellent conductivity. In contrast, materials with low electrical conductivity or insulators, like rubber or glass, do not allow electrons to move freely, inhibiting the flow of electric current.
When considering the options provided, solubility in water and melting points are not directly related to the movement of electrons, and brittleness is a mechanical property that describes how easily a material can break or shatter.
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What definition BEST describes a watershed?
Select one:
Area that collects precipitation and drains it to the lowest point
Consists only of rivers, lakes, and streams
Place where all water is stored underground
All of the rain water of a specific area
The best definition of a watershed is Option(A) Area that collects precipitation and drains it to the lowest point.
What is a watershed ?A watershed is the area of land where all of the water that drains off at its lowest point of it goes into the same place- a river, stream or lake. The smallest watersheds are the drainage areas for small streams and lakes. It can also be at the lowest point like a creek or a river.
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what elements make up a molecule of a glucose?
Answer:
All carbohydrates, including sugar, therefore contain the same three elements: carbon, hydrogen and oxygen. Different arrangements of these elements form single units to make different types of carbohydrates. Glucose, for instance, is a single-unit carb with six carbon atoms, 12 hydrogen atoms and six oxygen atoms.
Explanation:
Final answer:
A molecule of glucose is composed of carbon, hydrogen, and oxygen, with the chemical formula C6H12O6, featuring six carbon atoms, twelve hydrogen atoms, and six oxygen atoms arranged in a specific structure.
Explanation:
The elements that make up a molecule of glucose are carbon (C), hydrogen (H), and oxygen (O). The chemical formula for glucose is C₆H₁₂O₆. This indicates that each glucose molecule consists of six carbon atoms, twelve hydrogen atoms, and six oxygen atoms. These elements are arranged in a specific structure where each carbon atom forms four bonds connecting to other carbon atoms, as well as to hydrogen and oxygen atoms. The six carbon atoms form the backbone of the glucose molecule, with the oxygen and hydrogen atoms attached to this carbon chain.