Answer:
NO3 that is the answer to the question
A sample taken from a layer of mica In a canyon has 2.10 grams of potassium-40. A test reveals it to be 2.6 billion years old. How much potassium-40 was in the sample originally if the half-life of potassium-40 is 1.3 billion years? A. 4.20 g B. 8.40 g C. 12.6 g D. 16.8 g the E. 25.2 g
[tex]\huge\bold\pink{hello!!!}[/tex]
HERE IS UR ANSWER
_____________________
option b) is correct answer.
Which word equation best describes the following formula equation:
2HNO3 + Ca(OH)2 → Ca(NO3)2 + 2H2O?
A. Nitric acid and calcium hydroxide react to form calcium nitrate and water.
B. Two molecules of calcium nitrate react with one molecule of calcium hydroxide to form one
molecule of nitric acid and two molecules of water.
C. Two molecules of nitric water and one molecule of calcium water react to form one molecule of
nitric acid and two molecules of water.
D. Two molecules of nitric acid react with one molecule of calcium hydroxile to form one molecule
of calcium nitrate and two molecules of water.
Answer:
D
Explanation:
This is because that is the systematic name of the compounds above.
Two molecules of nitric acid react with one molecule of calcium hydroxide to form one molecule of calcium nitrate and two molecules of water. Hence, option D is correct.
What is an equation?A word equation represents a chemical reaction using the names of the substances involved.
[tex]2HNO_3 + Ca(OH)_2[/tex] → [tex]Ca(NO_3)_2 + 2H_2O[/tex]
Two molecules of nitric acid react with one molecule of calcium hydroxide to form one molecule of calcium nitrate and two molecules of water.
Hence, option D is correct.
Learn more about the equation here:
brainly.com/question/15399675
#SPJ5
If the velocity of a body is decreased to 1/2, then K.E. of the body decreases to
Answer:
1/4th
Explanation:
KE = .5mv^2
So when we decrease the velocity by half, we end up losing three fourths of net energy due to that value being squared.
Answer:
The Kinetic Energy is reduced to 1/4 of the original K. E.
Explanation:
K. E. = 1/2 m v^2
If v becomes v/2 we have:
K E. = 1/2 m (v/2)^2
= 1/2 m v^2/4
So dividing the 2:
we get 1/2 m v^2/4 / 1/2 m v^2
= v^2/4 / v^2
= v^2 / 4v^2
= 1/4.
When a drawing of a circle made in the center of a piece of paper with a black marker gets wet, the marker bleeds, and as the water moves through the paper the ink separates into several colors.
Answer:
Chromatography
Explanation:
Chromatography is a technique for separating mixtures that involves the use of a moving liquid and filter paper. The solvent travels through the spots on the paper, taking the chemicals away in the opposite direction. If the solvent combination has been properly chosen, each of them will move at a different velocity than the others.
The graph shows the volume of a gaseous product formed during two trials of a reaction. A different concentration of reactant was used during each trial, whereas the other factors were kept constant.
Which of the following statements explains which trial has a lower concentration of the reactant?
A: Trial 1, because the average rate of the reaction is lower.
B: Trial 1, because this reaction lasted for a longer duration than Trial 2.
C: Trial 2, because this reaction was initially fast and later slowed down.
D: Trial 2, because the volume of product formed per unit time was higher.
The rate of reaction means how fast or slow(speed) a reaction occurs.
The correct answer is A: Trial 1, because the average rate of the reaction is lower.
The rate of reaction is the speed with which reactants are converted into products. It is also the rate at which reactants disappear and products appear. The higher the rate of reaction, the greater the amount of product formed in a reaction.
If we look at the graph, we will realize that trial 1 produces a lesser amount of product than trial 2. This implies that the average rate of the reaction in trial 1 is lower than in trial 2.
Lower average rate of reaction implies lower concentration of the reactants since the rate of reaction depends on the concentration of reactants.
Hence trial 1 has a lower concentration of reactants because the average rate of the reaction is lower.
https://brainly.com/question/14221385
The correct option is option A: Trial 1, because the average rate of the reaction is lower
The average rate of reaction increases as the concentration of reactants increases;
The rate of reaction increases as the concentration of reactants increases because the number moles of the reaction particles increases resulting in increased collisions among the reacting particles followed by an increase in the number of effective collisions to form the total possible number of the product at a shorter time which shows a higher reaction rate.
The higher the reaction rate, the steeper the slope of the graph of the Amount of Products to Time produced and, from the given graph, Trial 2 has a higher average rate of reaction and given that other factors were kept constant, a higher concentration of reaction, while, Trial 1 that has a gentler slope of Amount of Product to Time has a lower concentration of the reactant, and therefore, the average rate of reaction in Trial 1, is lower
Therefore, the statement that explains which trial has a lower concentration of the reactant is option A, Trial 1, because the average rate of the reaction is lower
what is water
a. a universal solvent
b. something you can drink
c.a liquid
Answer:
FIRST OPTION WHICH IS A: UNIVERSAL SOLVENT
Explanation:
Water is called the "universal solvent" because it is capable of dissolving more substances than any other liquid. This is important to every living thing on earth. It means that wherever water goes, either through the air, the ground, or through our bodies, it takes along valuable chemicals, minerals, and nutrients.
Answer:
according to Chemistry its A
What makes a strong acid different from a weak acid?
Answer:
D. A strong acid dissociates more completely than a weak acid.
Explanation:
A P E X
how many mol of Mg(OH)2 are produced with 5.84 mol of Mg3N2
Answer:
https://socratic.org/questions/566a480e11ef6b5cb114ceea
hii pls help me to balance chemical equations
ammonia + oxygen ------> nitrogen + water
Answer:
Explanation:
Ammonia = NH3
Oxygen = O2
When these two (2) chemical elements react together, they form two chemical compound which are nitrogen oxide and water.
NH3 + O2 -----> NO + H2O
We would balance the chemical equation like this;
NH3 + 3O2 -----> 4NO + 2H2O
Drawing a conclusion derived from knowledge of an established principle is called deductive reasoning.
True
False
Answer:
the answer would be true
Answer:
false
Explanation:
cos the principle is established or known so it will not be a deductive or low reasoning
Balance the reaction and determine which of the following coefficients
Answer:
B. The correct ratio is 3:1:1:3
Explanation:
According to this question, the following chemical equation was given:
CH3COOH + Al(OH)3 → Al(CH3COO)3 + H2O
This equation is obviously not balanced because the number of atoms of each element on both sides of the equation is not equal or the same. To balance the equation, we make use of coefficients as follows:
3CH3COOH + Al(OH)3 → Al(CH3COO)3 + 3H2O
- There are now 6 moles of C on each side
- There are now 15 moles of H on each side
- There are now 9 moles of O on each side
- There is now 1 mole of Al on each side
The correct ratio of each compound is in the order 3:1:1:3
Which statement is true about matter?
a: all matter has volume
b: all matter has mass
c: both A and B.
d: all mater has either volume or mass but not both
Answer:
C
Explanation:
This is because matter is anything that has mass and occupies space.Therefore the space occupied by matter is volume
Plz Help I have One more time To retake and I can't fail it..
[tex]option(a)[/tex]
Explanation:
You answer is correct as you move from left to right across a period. But, the question is asked regarding to the right to left across a period. So, as you move from right to left across a period, you can find firstly Non-metals, secondly Metalloids, and lastly Metals.
What is one way to prevent soil erosion?
A. Plant trees
B. Plow fields
C. Spray weed killer.
D. Remove mulch.
its a plant trees
(need character limit)
The characteristics of a certain gas are listed in the table.
What is the expected density of the above sample of gas?
A - 3.16 g/L
B - 1.58 g/L
C - 1.21 g/L
D - 1.03 g/L
Answer:
Option A. 3.16 g/L
Explanation:
We'll begin by calculating the molar mass of Cl₂. This can be obtained as follow:
Molar mass of Cl₂ = 2 × 35.45
= 70.9 g/mol
Finally, we shall determine the density of Cl₂. This can be obtained as follow:
Molar mass of of Cl₂ (M) = 70.9 g/mol
Pressure (P) = stp = 1 atm
Temperature (T) = stp = 273 K
Gas constant (R) = 0.0821 atm.L/Kmol
Density (D) =?
D = PM / RT
D = (1 × 70.9) / (0.0821 × 273)
D = 70.9 / 22.4133
D = 3.16 g/L
Thus, the density of the gas is 3.16 g/L.
What effect does the electrostatic force have?
- Particles without charge repel each other.
- Particles of different masses repel each other.
- Particles of opposite charge repel each other.
- Particles of the same charge repel each other. (ANSWER)
D
Explanation:
Particles of the same charge repel each other
Catalysts help reactions happen more easily. This graph shows the energy of
a reaction without a catalyst. Which graph shows the energy of the same
reaction with a catalyst?
Answer:
D.
Explanation:
Catalysts are substances that increase the rate of a reaction i.e. make it faster. Catalysts do this by reducing the activation energy needed for a reaction to occur.
According to the image in this question, a graph showing the energy of a reaction without a catalyst is displayed. This means that a longer time will be spent. However, with a catalyst, the activation energy will reduce as seen in the image in option D.
(07.01 MC)
A potential energy diagram is shown.
70
60
Products
50
40
Potential Energy (kJ)
30
Reactants
20
10
0
Reaction Pathway
What is the activation energy of this reaction? (5 points)
Answer:
the activation energy is 65-30
35
The activation energy of this reaction is 35 kJ.
What is activation energy?Activation energy, in chemistry, the minimum amount of energy that is required to activate atoms or molecules to a condition in which they can undergo chemical transformation or physical transport.
The activation energy is equal to the difference between the threshold energy needed for the reaction and the average kinetic energy of all the reacting molecules.
The activation energy of a reaction is the difference in energy between the threshold energy and energy of the reactants.
Given,
The highest energy for a reaction to happen = Threshold energy = 65 kJ
Energy of the reactants = 30 kJ
Therefore, The activation energy of this reaction is 35 kJ.
Learn more about activation energy here:
https://brainly.com/question/28384644
#SPJ2
molecular formula of ammonium nitrite using cris method
Answer:
By using the criss cross method,the -1 charge of nitrate ion is shifted to ammonium ion and +1 charge of ammonium ion is shifted to nitrate ion. In this way, the final formula NH4NO3 is formed for the ammonium nitrate.
why is it important of having regular supervision of the market?
Matter is anything that takes up space.Which units of measurements can you use to describe these two properties?
Answer:
Matter is anything that has mass and takes up space. Mass gives an object the property of weight and inertia (resistance to change in the motion of an object). ... If something is in a solid state of matter, it has a definite shape and volume. The volume of an object is the amount of space it occupies.
Explanation:
We mix 2.5mL of NaOH 0.5M with 2.5mL of HCl 0.5M both at 25◦C in a constant-pressure calorimeter. The heat of reaction is -40KJ/mol. Calculate the final temperature inside the calorimeter, if the solution density is 1g/mL and the specific heat of the solution is 4.184J/g ◦C.
Answer:
awawaw
Explanation:
Which of the following is true about Avogadro’s number? *
A. It’s 6.02 x 1023 number
B. It’s a counting number
C. It is used to convert between molecules and moles
D. All of the above
Answer:
B is correct
Explanation:
I took a test and got it right
Answer:
it is 6.023×10^23 atoms
Balance the following equations by inserting the proper coefficients.
CH4 +
O2 CO2 +
H2O
CaCl2 +
AgNO3 Ca(NO3)2 +
AgCl
C2H6O +
O2
CO2 +
H2O
Answer:
2, 2, 2, 2, 3, 2, 3
Explanation:
The coefficient of the equation (i) CH₄ + O₂ → CO₂ + H₂O are 2, 2 the coefficient of equation (ii) CaCl₂ + AgNO₃ → Ca(NO₃)₂ + AgCl are 2, 2 and the coefficient of equation (iii) C₂H₆O + O₂ → CO₂ + H₂O are 3, 2, 3.
What is Balanced Chemical Equation ?
The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.
Here the given equations are
(i) CH₄ + O₂ → CO₂ + H₂O
(ii) CaCl₂ + AgNO₃ → Ca(NO₃)₂ + AgCl
(iii) C₂H₆O + O₂ → CO₂ + H₂O
Now balance the equation (i)
CH₄ + O₂ → CO₂ + H₂O
Reactant side Product Side
C = 1 C = 1
H = 4 H = 2
O = 2 O = 3
In the reactant side there are 4 H atoms and in product side there are 2 H atoms are present. So multiply by 2 in the product side to balance the H atoms.
CH₄ + O₂ → CO₂ + 2H₂O
Reactant side Product Side
C = 1 C = 1
H = 4 H = 4
O = 2 O = 4
In the reactant side there are 2 O atoms and in product side there are 4 H atoms are present. So multiply by 2 in the reactant side to balance the O atoms.
CH₄ + 2O₂ → CO₂ + 2H₂O
Reactant side Product Side
C = 1 C = 1
H = 4 H = 4
O = 4 O = 4
Here we can see that the equation is balanced. The coefficient are 2, 2.
Now balance the equation (ii)
CaCl₂ + AgNO₃ → Ca(NO₃)₂ + AgCl
Reactant side Product Side
Ca = 1 Ca = 1
Cl = 2 Cl = 1
Ag = 1 Ag = 1
N = 1 N = 2
O = 3 O = 6
In the reactant side there are 2 Cl atoms and in product side there is 1 Cl atom is present. So multiply by 2 in the product side to balance the Cl atoms.
CaCl₂ + AgNO₃ → Ca(NO₃)₂ + 2AgCl
Reactant side Product Side
Ca = 1 Ca = 1
Cl = 2 Cl = 2
Ag = 1 Ag = 2
N = 1 N = 2
O = 3 O = 6
In the reactant side there is 1 Ag atom and in product side there are 2 Ag atoms are present. So multiply by 2 in the reactant side to balance the Ag atoms.
CaCl₂ + 2AgNO₃ → Ca(NO₃)₂ + 2AgCl
Reactant side Product Side
Ca = 1 Ca = 1
Cl = 2 Cl = 2
Ag = 2 Ag = 2
N = 2 N = 2
O = 6 O = 6
Here we can see that the equation is balanced. The coefficient are 2, 2.
Now balance the equation (iii)
C₂H₆O + O₂ → CO₂ + H₂O
Reactant side Product Side
C = 2 C = 1
H = 6 H = 2
O = 3 O = 3
In the reactant side there are 2 C atoms and in product side there is 1 C atom is present. So multiply by 2 in the product side to balance the C atoms.
C₂H₆O + O₂ → 2CO₂ + H₂O
Reactant side Product Side
C = 2 C = 2
H = 6 H = 2
O = 3 O = 5
In the reactant side there are 6 H atoms and in product side there are 2 H atoms are present. So multiply by 3 in the product side to balance the H atoms.
C₂H₆O + O₂ → 2CO₂ + 3H₂O
Reactant side Product Side
C = 2 C = 2
H = 6 H = 6
O = 3 O = 7
In the reactant side there are 3 O atoms and in product side there are 7 H atoms are present. So multiply by 3 in the reactant side to balance the O atoms.
C₂H₆O + 3O₂ → 2CO₂ + 3H₂O
Reactant side Product Side
C = 2 C = 2
H = 6 H = 6
O = 7 O = 7
Here we can see that the equation is balanced. The coefficient are 3, 2, 3.
Thus, we can say that the coefficient of the equation (i) CH₄ + O₂ → CO₂ + H₂O are 2, 2 the coefficient of (ii) CaCl₂ + AgNO₃ → Ca(NO₃)₂ + AgCl are 2, 2 and the coefficient of equation (iii) C₂H₆O + O₂ → CO₂ + H₂O are 3, 2, 3.
Learn more about the Balanced Chemical Equation Here: brainly.com/question/26694427
#SPJ2
How does peer review affect research?
A. Experimental results will be trusted by the scientific community
only if they have been peer-reviewed.
B. Experimental results will be published only before they have been
peer-reviewed.
C. An experiment will not be repeated by others if it has been peer-
reviewed.
O D. Experimental results are possible only if they have been peer-
reviewed.
Answer:
A: Experimental results will be trusted by the scientific community
only if they have been peer-reviewed.
Explanation:
It is NOT C as I have tried it, it did not work and makes no sense.
What type of molecule is shown below?
A. Alkyne
B. Alkene
C. Alkane
D. Aromatic
The diagram represents the molecule Alkene with the correct option B.
ALKENES are hydrocarbons which contains at least one double bond between the carbon atoms in the molecule. They have the general molecular formula of CnH2n;where, n is a positive whole number which is equal to or greater than 2.
They contain two hydrogen atoms less than the alkanes. This is because, unlike the alkanes which are saturated compounds, the alkenes are unsaturated compounds which contain a carbon-carbon double bond in their molecular structures.
Alkenes take their names by changing the -ane of the corresponding alkane to -ene, for example ethane to ethene; propane to propene; butane to butene and so on.
ALKENES undergo both substitution and addition reactions. The latter helps in breaking the double bond and hence bestowing saturation unto the compound. ALKENES can be used for the following:
It is used as fuel It is used in the manufacture of plastic and it can be used to induce ripening of fruits.The first member of the alkenes is ethene and this is illustrated in the attached diagram.
Therefore the diagram shown in the question is an ALKENE. The correct option is B.
You can learn more here:
https://brainly.com/question/14237231
Please hurry!!!!!!!!!!
Due tomorrow
Which pair of properties describes the elements in Group 18?
F They are chemically stable and liquid at room temperature.
G They have eight valence electrons and are flammable
H They are magnetic and boil at low temperatures.
J They are gaseous at room temperature and chemically stable.
Answer:
G
Explanation:
They have eight valence electrons and are flammable
*not sure about this answer
Explanation:
the correct answer is C
hope it helps you
Seeds are organs within the reproductive system of plants. How is the spreading of seeds important to the survival of an organism?
A. An organism must reproduce in order to find a suitable place to live.
B. Although a single organism can survive without reproducing, organisms must reproduce in order to ensure the survival of the species.
C. Although a single organism can survive without reproducing, the organism must spread its seeds in order to protect itself from disease.
D. An organism must reproduce in order to absorb nutrients from the environment. SUBMIT
Answer:
Although a single organism can survive without reproducing, organisms must reproduce in order to ensure the survival of the species.
which one is unsaturated hydrocarbon?
options:
I) C3H8
2) CH4
3) C2H6
4) C2H4
pls tell the answer fast
Answer:
The correct answer is - D C2H4.
Explanation:
Saturated hydrocarbons are hydrocarbons with single covalent C-C bonds. They are known as alkanes. The general formula for these hydrocarbons is CnH2n+2
Unsaturated hydrocarbons the hydrocarbons with double or triple covalent C-C bonds. They are known as alkenes and alkynes respectively. The general formula for these hydrocarbons is CnH2n and CnHn-2
For the given options:
Option D: C2H4, is the simplest alkene with a double bond so it is an unsaturated hydrocarbon.
Name the following bases.
Fe(OH)3
- iron(III) hydroxide
- iron(II) hydroxide
- iron hydroxide
Answer:
1
Explanation:
Ferric Hydroxide
3. 1
Fe. (OH)
Fe(OH)3
Answer:
iron(III) hydroxide
Explanation:
I just took the quiz!
