Which part of the atom makes it unique?
Answer:
nucleus
Explanation:
Ted likes to run long distances. He can run 20 km 20 km20, start text, space, k, m, end text in 95 9595 minutes. He wants to know how many kilometers ( k ) (k)left parenthesis, k, right parenthesis he will go if he runs at the same pace for 285 285285 minutes. How far will Ted run in 285 285285 minutes?
Answer:
The distance in kilometer that Ted will go if he runs at the same pace for 285 minutes is 60km
Step-by-step explanation:
It was given that Ted Ted runs 20 km in 95 minutes, so for us to know how many kilometers he runs at the same pace for 285 minutes by using proportion.
For Ted to run 20 km in 95 minutes.
[tex]Speed=Distance/Time[/tex]
where given distance= 20km
Given time =95minutes
Speed=20/95 .............eqn(1)
To calculate the distance in kilometers Ted will go if he runs at the same pace for 285 minutes, then
Speed= K/225 ...............eqn(2)
Let us represent distance with 'K'
Given time 225minutes
Equating eqn(1) and eqn(2)
Hence the proportion model that Ted could use in modelling this situation is this;
[tex]20/95=K/225[/tex]
Cross multiply
K×95=20×225
[tex]K=60[/tex]
The distance in kilometer that Ted will go if
he runs at the same pace for 285 minutes is 60km
what can you add to a voltaic cell to make it into an electrolytic cell?
Answer:
a cell or battery
Explanation:
this is because a voltaic cell is such a cell where chemical energy gets converted to electrical energy. the energy conversion in the case of an electrolytic cell is from electric to chemical (battery supplies electrons to the anode respectively). So, I feel by adding a cell or battery, we can change the way energy conversion takes place, thereby changing the process.
based on the data table, which unknown solution could be 0.1 m naoh
Answer:
Where is the data table?
1. Which of the following is not among the first twenty elements? A. Chlorine B. Beryllium C. Iron D. Calcium 2. The number of atoms in one mole of an element is referred to as A. molecularity B. chemical symbol C. atomicity D. chemical element 3. What is the chemical symbol of Aluminum? A. AL B. Al C. aL D. al. 4. Which of the following is a heterogeneous mixture? A. Soft drink B. Air C. Flood C. Solution salt 5. Which of the following is false about mixtures? A. They can easily be separated by Chemical method B. They are not represented by chemical formula C. They can be homogenous or heterogeneous D. The constituents are physically combined 6. Which of the following elements is diatomic? A. Sodium B. Potassium C. Helium D. Oxygen 7. A diatomic element has ___________ number of atoms in one molecule of its element. A. one. B. two. C. three. D. four. 8. Which of the following is an example of a colloidal solution? A. Chalk in water B. Sand in water C. Sugar solution D. Solution of eggwhite 9. A mixture whose constituents are uniformly mixed is referred to as a A. homogeneous mixture B. suspension C. heterogeneous mixture D. colloidal solution 10. _____________ is a force that opposes motion when two surfaces are in contact with each other. A. Movement B. Pressure C. Friction D. gravity 11. _____________ is a substance, which cannot be split or broken down into any simpler form by an ordinary chemical process. A. Mixture B. Element C. Compound D. Metals. 12. Alloys are best classified as A. elements B. compounds C. mixtures D. non-metals 13. A type of force which occurs when a body moves constantly over another body is the _______ A. static force B. dynamic force C. magnetic force D. frictional force. 14. Which of the following is NOT a characteristic of friction? A. The ratio of the frictional force and the normal reaction is constant. B. The frictional force is always equal to the force applied through weight. C. Static frictional force is independent of the surface area in contact. D. Friction supports motion. 15. Use of ball or roller bearing on a turning wheel of a machine A. can cause wear and tear of the wheel B. reduces friction between the wheel and the body parts of the machine C. decreases the efficiency of the machine. D. hinders the productivity of the machine. 16. Another way of reducing friction is by A. painting B. alloying C. oiling D. braising 17. A block of wood weighs 4N lies on a horizontal table. Calculate the frictional force between the table and the wood if the coefficient of the static friction is 0.5. A. 1.0N B. 0.2N C. 2.0N D. 0.4N 18. A body of mass 2kg was moved uniformly by a force of 15N, if acceleration due to gravity is 15m/s, determine the coefficient of dynamic friction. A. 0.75 B. 1.5 C. 0.5 D. 1.75 19. The symbol for Beryllium is A. B. B. Be C. Bl D. Bm 20. K is the symbol of A. Calcium B. Chromium C. Potassium D. Krypton
Answer:
c. iron
Explanation:
iron's atomic number is 26
13)
Which emission causes the atomic number of a nuclide to decrease by 2 and its mass
number to decrease by 4?
Answer:
Alpha decay.
Explanation:
When an element undergoes alpha decay, the resulting daughter nuclei will have a decrease of 4 in the mass number and a decrease of 2 in the atomic number.
In the attached photo, 235 92U undergo alpha decay to produce 231 90Th.
Comparing the mass number and atomic number of 235 92U with that of 231 90Th we can see that the mass of 231 90Th reduced by 4 and the atomic number reduce by 2 indicating that the parent nucleus is undergoing alpha decay.
Answer:
Alpha emission
Explanation:
The alpha particle is akin to a helium nucleus hence it is often referred to as a helium nucleus. The alpha particle has four mass units and a charge if +2.
Alpha emission is one of the emissions undergone by radioactive nuclei. When an atom undergoes alpha emission, it is easy to notice because the mass number of the nucleus decreases by four while its atomic number decreases by two. The daughter nucleus is now found two places behind its parent in the periodic table.
An example of alpha emission is shown below;
23592U→42He+23190Th
Thorium is four mass units less than U-235 and two places behind uranium in the periodic table as explained above.
Combustion and corrosion are similar reactions because they both... A) release Carbon Dioxide as a product B) release oxygen as a product C) require oxygen as a reactant D) Have a metal as a reactant
Answer:
B. release oxygen as a product
Explanation:
HELP ME PLEASE !!!!!!!!!!
Answer:
1, deductive reasoning
2, hypothesis
3, law
4, objective
5, presupposition
6, qualitative
7, quantitative
8, subjective
9, theory
why do airbags fill evenly with gas?
Answer:
The signal from the deceleration sensor ignites the gas-generator mixture by an electrical impulse, creating the high-temperature condition necessary for NaN3 to decompose. The nitrogen gas that is generated then fills the airbag. hope that helps love!
How many ml of 0.5M of HNO3 would be needed to react with 85ml of 0.75M of KOH
Answer: 127.5ml
Explanation:
To calculate the volume of acid, we use the equation given by neutralization reaction:
[tex]n_1M_1V_1=n_2M_2V_2[/tex]
where,
[tex]n_1,M_1\text{ and }V_1[/tex] are the n-factor, molarity and volume of acid which is [tex]HNO_3[/tex]
[tex]n_2,M_2\text{ and }V_2[/tex] are the n-factor, molarity and volume of base which is KOH.
We are given:
[tex]n_1=1\\M_1=0.5M\\V_1=?mL\\n_2=1\\M_2=0.75M\\V_2=85mL[/tex]
Putting values in above equation, we get:
[tex]1\times 0.5\times V_1=1\times 0.75\times 85\\\\V_1=127.5mL[/tex]
Thus 127.5 ml of 0.5M of HNO3 would be needed to react with 85ml of 0.75M of KOH
How many elements are present in each of the following HF and. Hf ii) Co and CO iii) Si and SiO2 iv) PoCl2 and POCC3
Answer:
HF and Hf consist of 3 elements: Hydrogen (H), Flourine (F) and Hafnium (Hf).Co and CO consist of 3 elements: Cobalt (CO), Carbon (C) and Oxygen (O).Si and SiO2 consist of 2 elements: Silicon (Si) and Oxygen (O). {unless you mean SI where "I" would be iodine)PoCl2 and POCC3 have 5 elements: Polonium (Po), Chlorine (Cl), Phosphorus (P), Oxygen (O) and Carbon (C).Balance the following chemical equations.
a) Ba Cl2 + H2SO4 BaSO4 + HCl.
b) Calcium hydroxide + Carbon dioxide Calcium carbonate + Water.
c) Aluminum + Copper chloride Copper + Aluminum chloride
d) Sulphur dioxide + Oxygen Sulphur trioxide
e) NH3+ CuO Cu + N2 + H2O
Answer:
See the explanation
Explanation:
In this question we have to take into account that we have to get the same amount of atoms on both sides, so:
Reaction 1
[tex]BaCl_2~+~H_2SO_4~=>~BaSO_4~+~2HCl[/tex]
We have 1 Ba, 2 Cl, 2 H and 4 O on both sides
Reaction 2
[tex]Ca(OH)_2~+~CO_2~=>~CaCO_3~+~H_2O[/tex]
We have 1 Ca, 2O, 2 H and 1 C on both sides
Reaction 3
[tex]2Al~+~3CuCl_2~=>~2 AlCl_3~+~3Cu[/tex]
We have 2 Al, 3 Cu, and 3 Cl on both sides
Reaction 4
[tex]2SO_2~+~O_2~=>~2SO_3[/tex]
We have 2 A and 6O on both sides
Reaction 5
[tex]2NH_3~+~3CuO~=>~3Cu~+~N_2~+~3H_2O[/tex]
We have 2 N, 3 H, 3 Cu and 3O on both sides.
I hope it helps
16. Sulphuric acid + Sodium hydroxide is equal to Sodium sulfate + water.
a. Acid + metal
b. Acid + alkalic.
c. Acid + carbonated.
d. None of the above
Which is correct?
Answer:
The answer is B.
Explanation:
In the reaction above, Sulphuric acid is an acid and Sodium hydroxide is an alkaline. It will produce salt and water in the product side.
Try to balance the following equation:
Mg(OH)2 + KCL --> KOH
+
MgCl2
Answer:
Mg(OH)2 + 2KCL > 2 KOH +MgCl2
What is the total mass of Kr-42 remaining in a 20-mg sample after 48.8 hours?
(1) 2.5 mg
(2) 5.0 mg
(3) 10 mg
4) 20 mg
Answer:
2.5milligram
Explanation:
Due to Kr-42 the 20mg will diluted to the experinental evluation
which molecule below contains an ionic bond?
a) N2
b) CI2
c) SO2
d) KCI
the term biodiversity means the variety of organism (true or false)
Answer:
true
Explanation:
The center of the atom is known as the?
Answer:
nucleus
Explanation:
An atom itself is made up of three tiny kinds of particles called subatomic particles: protons, neutrons, and electrons. The protons and the neutrons make up the center of the atom called the nucleus and the electrons fly around above the nucleus in a small cloud.
hope that helps!
Which of the following cannot be tested by science?
A) How adrenaline affects the mating behaviors of animals
B)How emotion affects the quality of a painting
C)How gravity affects the movement of an object
D)How temperature affects the sex of offspring
I'm pretty sure it's A)
Will there be a precipitate for the following reaction? Aqueous zinc chloride + aqueous sodium carbonate A. No B. Yes, there will be one precipitate. C. Yes, there will be two precipitates. D. Yes, there will be three precipitates.
Answer:
Option B. Yes, there will be one precipitate.
Explanation:
We'll begin by writing the balanced equation for the reaction between aqueous zinc chloride and aqueous sodium carbonate. This is given below:
ZnCl2(aq) + Na2CO3(aq) —> ZnCO3(s) + 2NaCl(aq)
From the equation above, we can see that one precipitate is form i.e zinc carbonate, ZnCO3 as it is insoluble in water.
Therefore, the reaction produces one precipitate.
Balance the equation: FeSO4(s) + O2(g) + H2O(l) = Fe(OH)3 + H2SO4
Answer: 4 FeSO4(s) + O2(g) + 10 H2O(l) ---> 4 Fe(OH)3 + 4 H2SO4
Explanation:
FeSO4(s) + O2(g) + H2O(l) = Fe(OH)3 + H2SO4
In other to balance the equation, the total number of atoms of each element on the Left Hand Side (LHS) of the equation must be equal to the total number of atoms on the Right Hand Side (RHS) of the equation.
Add the following coefficients to the equation;
FeSO4 = Add 4, H20 = Add 10, Fe (OH)3 = Add 4 and H2SO4 = Add 4
By doing this, you will discover that the total number of atoms on bothe sides of the equation are balanced; thus we have;
4 FeSO4(s) + O2(g) + 10 H2O(l) ---> 4 Fe(OH)3 + 4 H2SO4
how does water affect the growth of a plant?
What do a mole of magnesium (Mg) and a mole of iron (Fe) have in common?
A.
their number of atoms
B.
their number of molecules
C.
their number of electrons
D.
their number of protons
Answer:
A. Their numbers of atoms
Explanation:
The minimum amount of unstable atoms needed to produce an uncontrolled chain reaction is called _____.
atomic mass
mass number
critical mass
1
When barium chloride is allowed to react with silver nitrate to give barium nitrate and silver chloride, what are the coefficients for the balanced equation?
___BaCl2 (aq) + ___AgNO3 (aq) → ___AgCl (s) + ___Ba(NO3)2 (aq)
a)1, 2, 2, 1
b)1, 1, 1, 1
c)1, 2, 3, 1
d)1, 1, 1, 2
Answer:
Hello
The first one is correct.
Good luck
Explanation:
17) which
of the following is a polymer?
a)starch
b)Cellulose
c)Polyvinyl chloride.
d)Sun flower.
Answer:
a b, c
Explanation:
starch is a polymer-polymeric carbohydrate
cellulose is also one-straight chain polymer
polyvinylchloride -a synthetic plastic polymer
sun flower-used for folate medication
Which of the following statements about water are true 1) water cover 75% of Earth 2) once water is used it can never be reused 3) only 3% of Earth’s water is fresh 4) water comprises the majority of all plants and animals.
Answer:
I guess the 1st one idk
what is 89,700,000,000 in scientific notation
Answer:
89.7 billion in scientific notation = 8.97 × 1010.
Explanation:
state two characteristics of matter demonstrated by
diffusion brownian motion ? and I want small answer
please halp me quick it is argent
1.matter is made up of small particles
2.particles of matter are in constant random motion
Explanation:
1.Particles eg of salt can be crashed into smaller particles 2.When you sprinkle pollen grains on water in a beaker and observe using a hand lens U'll see they are moving randomly
Need Help ASAP: What is electrostatic attraction?
A. Electrical charge generated when two ionic compounds are placed near each other.
B. Attraction that occurs in ionic compounds when exposed to an electrical current.
C. None of these
D. The attraction between positive and negative ions in an ionic bond.
Answer:
ANSWER D IS CORRECT .(the attraction between positive and negative ions in an ionic bold.
Explanation:
The attraction between positive and negative ions in an ionic bond. Hence, option D is correct.
What is the electrostatic attraction?The electrostatic force is an attractive and repulsive force between particles caused due to their electric charges.
Ionic bonding is the attraction between positively- and negatively-charged ions. These oppositely charged ions attract each other to form ionic networks (or lattices). Electrostatics explains why this happens: opposite charges attract and as charges repel.
Hence, option D is correct.
Learn more about electrostatic attraction here:
https://brainly.com/question/14889552
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