Answer:
ethylene molecule. The molecule has trigonal planar geometry around its carbon atoms
20POINTS!!!
HELP PLEASE!! This might be an easy question for some!!! WILL LOVE YOU 4EVER!!!
Increasing concentration increases the number of collisions and decreases the reaction rate.
True
False
Answer: False
Explanation: Increasing the concentration of a reactant increases the frequency of collisions between reactants and will, therefore, increase the reaction rate
Which rule concerning oxidation numbers is true?
A. When a redox reaction occurs, there will always be at least one atom that is oxidized and at least one atom that is reduced.
B. Oxidation is the process by which an atom loses electrons.
C. Reduction is the process by which an atom gains electrons.
D. All of the Above
E. None of the Above
Answer:
B
Explanation:
because an atom is the smallest particles that have electrons, neutron and protons
Can someone help me please click the picture?
Answer:
The number of atoms on both sides of the expression is not balanced
Explanation:
Stated equation:
KClO₃ → KCl + O₂
The equation above does not obey the law of conservation of mass because the atoms on both sides of the expression are not the same.
The law of conservation of mass states that "in a chemical reaction, atoms are neither created nor destroyed, but are transformed by combining with one another";
Number of atoms
Elements Left hand side Right hand side
K 1 1
Cl 1 1
O 3 2
We see that the number of oxygen on both sides of the expression differs.
A student titrated 25.0 cm3 portions of dilute sulfuric acid with a 0.105 mol/dm3 sodium hydroxide solution.The equation for the reaction is: 2 NaOH + H2SO4 ⟶ Na2SO4 + 2 H2O Calculate the concentration of the sulfuric acid in mol/dm3 Use only the student's concordant results.
Answer:
This question is incomplete
Explanation:
This question is incomplete as the volume of the base that was used during the titration was not provided. However, the completed question is in the attachment below.
The formula to be used here is CₐVₐ/CbVb = nₐ/nb
where Cₐ is the concentration of the acid = unknown
Vₐ is the volume of the acid used = 25 cm³ (as seen in the question)
Cb is the concentration of the base = 0.105 mol/dm³ (as seen in the question)
Vb is the volume of the base = 22.13 cm³ (22.1 + 22.15 + 22.15/3)
nₐ is the number of moles of acid = 1 (from the chemical equation)
nb is the number of moles of base = 2 (from the chemical equation)
Note that the Vb was based on the concordant results (values within the range of 0.1 cm³ of each other on the table) of the student
Cₐ x 25/0.105 x 22.13 = 1/2
Cₐ x 25 x 2 = 0.105 x 22.13 x 1
Cₐ x 50 = 0.105 x 22.13
Cₐ = 0.105 x 22.13/50
Cₐ = 0.047 mol/dm³
The concentration of the sulfuric acid is 0.047 mol/dm³
2. In pigeons, the allele B produces ash-red feathers. The allele b produces
blue feathers. The B allele is dominant to the ballele. A pigeon with
genotype Bb is crossed with a pigeon with genotype bb. What percent of
the offspring are expected to have ash-red feathers?
A. 0%
B. 25%
C. 50%
D. 100%
Answer:
it is C
Explanation:i had this on my test and got it right lol
The sum of the potential energy and the kinetic energy of an object is its thermal energy. True or false?
Answer:
false
Explanation:
Answer:
False.
Explanation:
The sum of potential energy and the kinetic energy of an object is mechanical energy.
Hope that this helps!!! :)
does a positive charge make the atomic radius smaller? and does a negative charge make the atomic radius bigger? yes or no.
I have science and i have a question that says : an element is a (valuable, pure , rare) substance that is not chemically combined with any other elements
Answer:
It’s true ( pure).
Explanation:
An element is defined as a pure substance that is not chemically combined with any other elements. An element comprises of mainly the sane type of atoms.
While a compound is a substance that consists of two or more elements which are chemically combined together. This is the main difference between an element and a compound.
What is a reactant of a chemical reaction?
The reactant of a chemical reaction is one of the two or more substances in a chemical reaction. This image should help:
1) How much energy, in joules, is needed to change 26.5 g of solid water at 0.0 deg C to liquid water at 48.3 deg C?
Answer:
Q = 5350.2 Joules.
Explanation:
Given the following data;
Mass, m = 26. 5g
Initial temperature, T1 = 0°C
Final temperature, T2 = 48.3°C
Specific heat capacity of water, c = 4.18 J/g°C.
*To find the quantity of heat*
Heat capacity is given by the formula;
[tex] Q = mcdt[/tex]
Where;
Q represents the heat capacity or quantity of heat. m represents the mass of an object. c represents the specific heat capacity of water. dt represents the change in temperature.dt = T2 - T1
dt = 48.3 - 0
dt = 48.3°C
Substituting the values into the equation, we have;
[tex] Q = 26.5*4.18*48.3[/tex]
Q = 5350.2 Joules.
Therefore, the amount of heat absorbed is 5350.2 Joules.
10.8 1.0
Electronegativity difference of Mg and O:
yes
no
Answer:
2.3 / yes
Explanation:
edg 2020
Answer: 2.3 and yes
Explanation:
Substance A is tested to see if it is an acid or a base. A piece of iron is placed
in substance A and the iron starts to wear away over time (corrosive).
Substance A has a sour taste, and will produce a burning/tingling feeling
when touched with a bare hand. Is Substance A an acid or a base?
Answer:
[tex]\huge\boxed{\sf Acid}[/tex]
Explanation:
An acid has the following properties:
=> Is corrosive to Iron and reacts with it.
=> Has a sour taste.
=> Produces a burning sensation when touched.
So, Substance A is an acid.
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AnonymousHelper1807PLEASE HELP!
Which of the following is an example of a chemical change?
A. A large nail rusting
B. Folding a piece of paper
C. Filling a balloon with hot air
D. Wax melting from a candle
Answer: A. a large nail rusting
Explanation:
Which pair of objects is experiencing the greatest gravitational force
Answer:
Explanation:
Is that the question
Answer:
If it's between human and tennis ball, human and dog, human and building, human and earth.
It would be HUMAN AND EARTH
Explanation:
I took the test and got that.
Define and characterize a suspension, listing similarities and differences to a colloid.
Before J.J. Thomson began gathering evidence about electrons in 1897, what did scientists know about atoms?
Answer: Scientists generally thought atoms were the smallest particles that could not be broken down any further.
Explanation: Trust me
To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Scientists generally thought atoms were the smallest particles that could not be broken down any further.
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.
In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron.
Before J.J. Thomson began gathering evidence about electrons in 1897. Scientists generally thought atoms were the smallest particles that could not be broken down any further.
Therefore, Scientists generally thought atoms were the smallest particles that could not be broken down any further.
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01:48:21
Avogadro’s number was calculated by determining the number of atoms in
12.00 g of carbon-12.
14.00 g of carbon-12.
12.00 g of oxygen.
14.00 g of oxygen.
Answer:
It is 12.00 g of carbon-12.
Explanation:
On yeeeeeeeeeeeee
3.
Which of the following is not true for atoms? (4 points)
They combine to form elements and molecules.
They contain negatively charged electrons.
They are the building blocks of matter.
They are made up of elements.
Answer:
They are made up of elements.
Explanation:
An atom is the smallest particle of matter that still retains the property of the element.
Two or more atoms combine to form elements or compounds. Elements are formed by two or more similar atoms, while compounds are formed by two or more different elements.
Atoms are made up of subatomic particles, protons, electrons and neutrons. Electrons are negatively charged, protons are positively charged while neutrons have no charge.
I hope this help! :)
Which type of wave is this?
Answer:
A Transverse Wave
6th grade science i mark as brainliest
Matter and energy may be created or destroyed in a chemical reaction.
Answer:false
Explanation:matter cannot be created or destroyed in a chemical reaction it is rearranged
hi help me pls i don't know this
Explanation:
A ammonium B sulphate C nitrate D phosphate
What happens when the North Pole of one bar magnet is near the south Pole of another bar magnet?
A.Both attraction and repulsion
B.neither attraction nor repulsion
C.attraction
D.repulsion
When the North Pole of one bar magnet is near the South Pole of another bar magnet, they will attract each other. So, the correct option is C, attraction. This is because opposite magnetic poles attract each other, while like magnetic poles repel each other.
What is a magnetic field?A magnetic field is a region in space where a magnetic force can be detected. It is created by the movement of charged particles, such as electrons, protons, and ions. A magnetic field can be produced by a magnet, an electric current, or a changing electric field.
When the North Pole of one bar magnet is near the South Pole of another bar magnet, they will attract each other. This is because the magnetic field lines of the two magnets interact in such a way that they try to align with each other. Since opposite magnetic poles attract each other, the North Pole of one magnet will be attracted to the South Pole of the other magnet.
The magnetic force between the two magnets depends on the strength of the magnetic field and the distance between the magnets. The closer the magnets are, the stronger the magnetic force will be.
Therefore option C, attraction is correct.
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y’all pls help me with this I’m literally so done
Answer:
Explanation:
I can help you
Experiment: finding absolute zero experimentally
Complete the following analysis and conclusion and submit below.
1. Calculate the Kelvin temperatures of the water and record your answers in the data table.
2. Find the change in the volume of air in the flask from your data and record in data table.
3. Use the equation V 1 / T 1 = V 2 / T 2 to calculate the expected volume of air when cooled in tap water.
4. How do the expected final volume and the actual final volume compare?
5. What is the significance of elevating or lowering the flask until the water level in the flask is even with the water level in the beaker or container?
6. Construct a graph of the data. Plot the volume of the gas at room temperature in tap water and in ice water on the y axis. Plot the Kelvin temperature on the x-axis. Print out graph paper for your plot.
7. Extend the plotted line downward until it crosses the temperature axis. This process of extending a graph beyond the experimental data is called extrapolation.
8. At which temperature is the line predicted to cross the x-axis?
9. At which temperature did the line actually cross the x-axis?
10. Account for any deviation between the predicted temperature line extrapolation and the actual line extrapolation.
11. Real World Chemistry - Explain why bottled gas containers are equipped with a relief valve?
Answer:
When mensuration volume of air within the flask at the primary temperature, a volume of 250mil was recorded, referred to as V1. The temperature of the air within the flask in boiling water was recorded as 99ᵒC, referred to as T2. so as to seek out the right calculations, 99ᵒC must be born-again to Kelvin by adding 273.
the primary temperature in Kelvin is 372K. the worth of V1/T1, may be found by swing 250/372. This involves a complete of zero.67. the quantity of the air within the flask of the second temperature was 177 mil, referred to as V2.
The temperature of the air within the cooled flask is 7ᵒC, referred to as T2. 7ᵒC must be born-again to Kelvin by adding 273 that involves a final total of 280K. the worth of V2/T2, found by swing 177/280 involves a complete of zero.63.
The close to equality in numbers may be attributed to Charles Law. Charles Law states that “as the temperature will increase, thus will the quantity of a gas sample once the pressure is command constant”.
The results of V1/T1 and V2/T2 were terribly on the brink of one another. this can be because of the very fact that this experiment was worn out as a closed system. In Charles Law, if there's a closed system the 2 ratios ought to have equal numbers. {this is|this is often|this may be} why it can be expected for the magnitude relation numbers to be terribly equal.
Halogens are toxic substances
True or False??
Answer:
true
Explanation:
true its true true
What is a covalent bond?
The principle of conservation of mass is satisfied in a chemical equation when
The law of conservation of mass is also called the law of conservation of matter. When a chemical equation is balanced then it obey the law of conservation of mass.
What is law of conservation of mass?The law of conservation of mass was postulated by the scientist A. Lavoisier. It states that in a chemical reaction, the total mass of the products is equal to the total mass of the reactants.
In a balanced chemical equation, the mass of the reactants and products on either side of the equation will be equal. In other words, matter is neither created nor destroyed in a chemical reaction.
A balanced chemical equation also contains the same number of atoms of reactants and products on both sides. An equation is balanced by adding stoichiometric coefficients to the reactants and products.
Thus it obey the law of conservation of mass.
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What’s different about the object floating and the water?
I need help plz.
Answer:
Different objects float at different levels in the water because as most regular objects are lowered into the surface of water, the upward push of the water steadily increases until it is in balance with the weight force of the object, and the object then continues floating at this level with the two forces in balance.
Which equation is balanced? “Hint...count the atoms of each element. Only compare like elements!
Answer:
2Mg + O2 = 2MgO
Explanation:
Al + 3F2 = AlF3 ..... F has 6 on the left and 3 on the right.
Na + F2 = 2NaF ..... Na has 1 on the left and 2 on the right.
2Al + 3O2 = Al2O3 .... O has 6 on the left and 3 on right.