Answer: The answer is A heat and pressure
Explanation:
Number 12 plsssssssssssssssssss
Answer:
check my explanation
Explanation:
it is the secondary consumer because it doesn't eat grass
What is the formula for dinitrogen pentoxide?
A) NO5
B) N5)2
C) N2O5
D)N2O7
A ________________ uses chemical formulas to model what happens in a chemical reaction.
Pick 1 of the following
molecule compound
chemical equation
chemical reaction
new chemical
Answer:
Explanation:
Chemical equation
Mosquitoes breed in areas where there is often standing, still, svampy, water. Mosquitoes can cause malaria and other harmful diseases to humans and animals. Without causing damage to an existing ecosystem, what could you do to help control the current mosquitoes and their larvae? (what would eat them ?)
Answer:
Many natural scents that are appealing to humans actually repel mosquitoes, including lavender, peppermint, basil, and eucalyptus. Many of these scents can be worn as an essential oil on your skin to help keep these pesky pests from biting you.
A piece of charcoal is found to contain
30% of the carbon 14 that it originally
had. When did the tree die from which the
charcoal came? use 5600 years as the
half-life of carbon 14.
A) 9709.46
B) 9708.33
C) 9708.34
D) 9709.45
Answer: The tree died 9709.46 years before.
Explanation:
Expression for rate law for first order kinetics is given by:
[tex]t=\frac{2.303}{k}\log\frac{a}{a-x}[/tex]
where,
k = rate constant
t = age of sample
a = let initial amount of the reactant = 100
a - x = amount left after decay process = [tex]\frac{30}{100}\times 100=30[/tex]
a) to find rate constant
Half life is the amount of time taken by a radioactive material to decay to half of its original value.
[tex]t_{\frac{1}{2}}=\frac{0.693}{k}[/tex]
[tex]k=\frac{0.693}{5600years}=1.24\times 10^{-4}years^{-1}[/tex]
b) to know the age
[tex]t=\frac{2.303}{1.24\times 10^{-4}}\log\frac{100}{30}[/tex]
[tex]t=9709.46years[/tex]
The tree died 9709.46 years before.
The volume of 3.2 moles of nitrogen gas inside a canister is 1.5L. The canister
volume is reduced to 0.3L. How many moles of nitrogen were released?
Answer:
2.56 moles of nitrogen was released.
Explanation:
We'll begin by calculating the final moles of nitrogen in the canister. This can be obtained as follow:
Initial mole (n₁) = 3.2 moles
Initial volume (V₁) = 1.5 L
Final volume (V₂) = 0.3 L
Final mole (n₂) =?
V₁/n₁ = V₂/n₂
1.5 / 3.2 = 0.3 / n₂
Cross multiply
1.5 × n₂ = 3.2 × 0.3
1.5 × n₂ = 0.96
Divide both side by 1.5
n₂ = 0.96 / 1.5
n₂ = 0.64 mole
Finally, we shall determine the number of mole of nitrogen that was released. This can be obtained as follow:
Initial mole (n₁) = 3.2 moles
Final mole (n₂) = 0.64 mole
Amount released =?
Amount released = n₁ – n₂
Amount released = 3.2 – 0.64
Amount released = 2.56 moles
Thus, 2.56 moles of nitrogen were released.
You titrate 25.00 ml of 0.1894 M acetic acid with 0.2006 M NaOH. How many ml of NaOH (to four significant figures) will be required at the equivalence point?
Answer:
23.60 mL NaOH
Explanation:
The reaction is CH3COOH + OH- --> CH3COO+ + H2O
Since the reaction is one-to-one, we can use M1V1 = M2V2.
M1 = 0.1894 M CH3COOH
V1 = 25.00 mL CH3COOH
M2 = 0.2006 M NaOH
V2 = ?
Solve for V2 --> V2 = M1V1/M2
V2 = (0.1894 M)(25.00 mL) / (0.2006 M) = 23.60 mL NaOH
Please I neeed help, I have to write: four ammonia molecules (NH3) react with four oxygen molecules(O2) to form four nitrogen monoxide molecules (NO) and six water molecules. All substances are in gaseous state and heat is released in the chemical reaction
Explanation:
the equation must be
4NH3 + 5O2–> 4NO + 6H2O
BRAINLIESTT
The pH of a solution is 8.43. What is it {H3O+}concentration?
A. 3.7 x 10-3
B. 2.7 x 10-6
C. 1.0 x 10-14
D. 1.0 x 10-8.43
Answer:
D. 1.0 x 10-8.43
Explanation:
The pH is an unit of concentration in chemistry used to determine the acidity -or basicity- of a particular solution. Is used in quality control to determine the security of a product for consumers.
The equation is:
pH = -log [H₃O⁺]
As pH = 8.43:
8.43 = -log [H₃O⁺]
10^-8.43 = [H₃O⁺]
1.0x10 -8.43 = [H₃O⁺]
Right option is:
D. 1.0 x 10-8.43Help me in this question please (No links!!.)
Answer:
Density = mass/volume so the answer is 6g/ml
Explanation:
Find the density of an object that has a mass of 12.69 grams and a volume of 3.5cm3
Answer:
3.62 g/cm³
Explanation:
density = mass ÷ volume
Therefore, do 12.69 divided by 3.5
an elephant puts a force of 30,000 N on its four feet,
which have a total area of 7,500 cm². What is the pressure
it puts on the ground
Explanation:
pressure is Force/area
30000/0.75
can someone do the rest of this for me i missed school the day we did it
Answer:
This is the answer
Explanation:
Balance the equation NaHCO3(s)....
Please help!!
Question #1
Answer:
NaHCO3 → H2O + CO2 + Na2CO3
Explanation:
Zinc reacts with nitric acid to produce hydrogen gas and zinc nitrate, Zn(NO3)2. 10.00 grams of zinc react with 7.84 grams of nitric acid. How many grams of excess reactant remain?
Answer:
Zn is the excess reactant and remain 5.94g
Explanation:
The reaction of Zn with HNO3 is:
Zn + 2 HNO3 → H2 + Zn(NO3)2
1 mole of Zn reacts with 2 moles of HNO3
To solve this question we must convert the mass of each reactant to moles in order to find limiting reactant. Thus, we can kknow the moles of excess reactant that will not react:
Moles Zn -Molar mass: 65.38g/mol-:
10.00g * (1mol / 65.38g) = 0.1530 moles Zn
Moles HNO3 -Molar mass: 63.01g/mol-:
7.84g * (1mol / 63.01g) = 0.124 moles HNO3
For a complete reaction of 0.124 moles of HNO3 are required:
0.124 moles HNO3 * (1mol Zn / 2 mol HNO3) = 0.0622 moles Zn. As there are 0.1530 moles, Zn is the excess reactant and will remain:
0.1530 moles - 0.0622 moles = 0.0908 moles Zn
The mass is:
0.0908 moles Zn * (65.38g / mol) =
5.94gWhich one of your body cells carries proteins that determine your blood type?
1) All of your cells
2)Skin cells
3) Red blood cells
4)White blood cells
What is an important effect of gravity?
A. It causes radioactive particles to split off from the nucleus.
B. It is responsible for charge attraction.
C. It keeps the nucleus of the atom together.
D. It maintains the distances between planets.
SUBMIT
Answer:
d. It maintains the distances between planets.
Explanation:
What are cells made of?
Answer: All cells are made from the same major classes of organic molecules: nucleic acids, proteins, carbohydrates, and lipids.
Explanation: please mark as brainliest
Which substance is a binary acid?
1,)hydrochloric acid
2.)phosphoric acid
3.)nitrous acid
4.)sulfuric acid
Answer:
1. Hydrochloric acid
Explanation:
Hydrochloric acid
Answer:
4)
Explanation:
formula:H2 SO4
there are 2 H+ ions in 1 molecule of sulfuric acid
thus it has a basicity of 2
can I write "+-" as the charge for a neutron in an atom or would it be considered wrong?
Answer:
yesssssssssssssss
Explanation:
0.75 moles of an unknown acid are dissolved in water. If 0.42 moles of H3O+ form, what was the percent dissociation of the unknown acid?
Answer:
56 %
Explanation:
The percent dissociation of a weak acid can be defined as:
Moles of weak acid that produced H₃O⁺ species / Total number of weak acid moles * 100%
We are given all the required data to calculate the percent dissociation:
0.42 mol / 0.75 mol * 100 % = 56 %
The percent dissociation is 56%.
A car travelled at the speed of 10 mls in 35 calculate the distance covered.
Pls help with science
Why would people with sickle-cell anemia get tired more easily than healthy people?
Explanation:
Because sickle-cells have trouble traveling through the smallest blood vessels, which means that muscles and tissue are not getting oxygen they need.
The subject is science I need you’re help plsssss
Answer:
sweat is the water that comes out of your body when you workout
Help me please!
What is the solubility of KNO3 in 100g of water at 60°C?
A.
28 grams/100g of H2O
B.
45 grams/100g of H2O
C.
108 grams/100g of H2O
D.
38 grams/100g of H2O
Answer:
C. 108 grams/100g of H2ORequired number is the vertical coordinate of the intersection point of a line at 60°C with the graph of the KNO₃.
How many grams are there in 51.9 moles of F2 gas? (4 pts)
PLS HELP ASAP ILY
Answer:
1972 grams of F₂
Explanation:
Multiply the molar mass of F₂ by the number of moles
What two reactants are necessary in order for a hydrocarbon combustion reaction to take place?
Answer:
A hydrocarbon and oxygen
Explanation:
hydrocarbon is being burned, and oxygen is necessary to burn things
To solve such this we must know the concept of Combustion reaction. The two reactants that are necessary in order for a hydrocarbon combustion reaction to take place are hydrocarbon and oxygen.
What is Balanced equation?Balanced equation is the one in which the total number of atoms of a species on reactant side is equal to the total number of atoms on product side.
Combustion reaction is a reaction in which a substance, basically hydrocarbons burns in presence of oxygen to produce carbon dioxide and water. The two reactants that are necessary in order for a hydrocarbon combustion reaction to take place are hydrocarbon and oxygen.
Therefore, hydrocarbon and oxygen are two reactant that are necessary in order for a hydrocarbon combustion reaction to take place.
Learn more about the balanced equation, here:
https://brainly.com/question/7181548
#SPJ2
On a hot day, a student places a glass of cold lemonade on a table outdoors. After a few minutes, water droplets have formed on the outside of the glass.
Is energy absorbed or released by the cold lemonade? Explain your answer.
Compare average kinetic energy for the air molecules and lemonade molecules when the student first places the lemonade outdoors. Explain your answer.
Explain how and why the water droplets form on the outside of the glass.
Answer:
ye but sdfajkd tryng to play me
Explanation:
Answer:
Vapor is released out of the lemonade because when you place it in a hot it will increase.
Explanation:
Tyler is running down the street after his brother at a speed of 1.2 m/s and contains 10.8 J of kinetic energy. Calculate Tyler’s mass
Answer:
I do not know
Explanation:
I am vert sorry but I do not know the answer.