The most abundant element in the universe
(1) Hydrogen
(2) Oxygen
(3) Nitrogen
(4) Helium
Answer:
Hydrogen
Explanation:
Hydrogen is universe's most simple element, which is most likely why it is the most abundant.
Mrs. Franklin loves teaching science and thinks about it all the time. While walking one day, she steps on a warm, fresh piece of used gum. The gum flattens and sticks to her shoe. When she lifts her foot, she sees long strings of gum between her shoe and the sidewalk. She thinks, "What a great demonstration of the properties of metals!"
What properties of metals would Mrs. Franklin most likely teach about with this demonstration?
conductivity and luster
ductility and malleability
malleability and reactivity
conductivity and ductility
Answer:
Ductility and Malleability
Explanation:
Pls mark my answer as brainliest
Answer:
the correct answer is Ductility and Malleability....(B)....
Explanation:
I took the test, hope this helps. also the person above me is correct
how many sig figs are in 1.008 and 120.9??
Answer:
there are 4 sig figs in 120.9 and there are 4 sig figs in 1.008
Explanation:
why burning of wood and cutting it into small pieces are considered as two different types
of changes.in sort type
.
اور بس انتي شلال
Answer:
burning causes pollution cutting results furniture
Explanation:
are u a nepali ?
Answer:
burning of wood, new substances are formed and hence it is a chemical change. While cutting the wood into small pieces no new substance is formed, thus it is a physical change. Hence, burning of wood and cutting it into small pieces are considered as two different types of changes.
Can the process of rusting be called combustion?
Answer:
no the answer is oxidation
Write the net ionic equation for the following reaction:
AgC2H3O2(aq) + CaCl2(aq) →
Answer:
2Ag^+(aq) + 2Cl^-(aq) --------> 2AgCl(s)
Explanation:
The net ionic equation reflects the main reaction that occurred in the system. It tells you the most important reaction that took place.
If we first put down the balanced molecular equation for the reaction, we have;
CaCl2(aq) + 2 AgC2H3O2(aq) ---------> 2 AgCl(s) + Ca(C2H3O2)2 (aq)
The net ionic equation is;
2Ag^+(aq) + 2Cl^-(aq) --------> 2AgCl(s)
The speed of a mechanical wave through a medium depends on the type of medium. It also depends on the type of mechanical wave. Which statement is true?
The statements are;
A) All waves travel at the same speed if no medium is present.
B) Electromagnetic waves require a medium, but mechanical waves do not.
C) All waves travel at the same speed through any medium.
D) Mechanical waves require a medium, but electromagnetic waves do not.
Answer:
Statement D is true.
Mechanical waves require a medium, but electromagnetic waves do not.
Explanation:
The two types of waves are;
Mechanical waves and Electromagnetic waves.
Mechanical waves require a medium, such as an atmosphere or water, to enable it transport its energy. For example sound waves occur when you clap and thereby distort the air around.
Whereas, Electromagnetic waves do not require a medium to enable it transport its energy. A good example would be light. Normally, Electromagnetic waves are usually formed when the electric field and the magnetic field are perpendicular to each other.
So electromagnetic waves can transmit without a medium because electric and magnetic fields can exist independently without a medium.
A student weighed an empty graduated cylinder. It weighed 35.86 g. She then carefully added water to the graduated cylinder until it reached the 7.5 mL mark. When she weighed the graduated cylinder again, this time with the 7.5 mL of water in it, it weighed 43.18 g. What was this student's experimental density of water? A relationship between the number of pennies and density
Question:
A student weighed an empty graduated cylinder. It weighed 35.86 g. She then carefully added water to the graduated cylinder until it reached the 7.5 mL mark. When she weighed the graduated cylinder again, this time with the 7.5 mL of water in it, it weighed 43.18 g. What was this student's experimental density of water?
Answer:
0.976 g/mL
Explanation:
Weight of empty cylinder = 35.86g
Volume of water = 7.5mL
Weight of cylinder + water = 43.18g
Experimental density = ?
Density of water = Mass of water / volume of water
Mass of water = (Weight of cylinder + water) - Weight of empty cylinder
Mass of water = 43.18 - 35.86 = 7.32g
Density = 7.32 / 7.5 = 0.976 g/mL
Rust forms when iron metal reacts with oxygen gas. Which chemical reaction best
supports the law of conservation of mass?
A. Fe + O2 --> Fe2O3
B. 2Fe + O2 --> 2Fe2O3
C. 3Fe + 202 --> Fe2O3
D. 4Fe + 302 --> 2Fe2O3
Answer:
D. 4Fe + 302 --> 2Fe2O3
Explanation:
The equation that bests supports the law of conservation of mass is the choice D;
4Fe + 3O₂ → 2Fe₂O₃
Based on the law of conservation of mass, the number of atoms on both sides of the expression must be the same. Only the fourth choice proves this law;
4Fe + 3O₂ → 2Fe₂O₃
Number of atoms
Elements Left hand side Right hand side
Fe 4 4
O 6 6
We can see that both side of the expression have the same number of atoms and the equation is balanced.
why is an atom regarded as electrically unstable
Answer: An atom can be considered unstable in one of two ways. If it picks up or loses an electron, it becomes electrically charged and highly reactive. Such electrically charged atoms are known as ions. Instability can also occur in the nucleus when the number of protons and neutrons is unbalanced.
Explanation:
When water evaporates, ...
kinetic energy decreases.
thermal energy is released.
heat energy is absorbed
Potential energy decreases
describe the theory of plate tectonics
Answer:
The theory of plate tectonics states that the Earth's solid outer crust, the lithosphere, is separated into plates that move over the asthenosphere, the molten upper portion of the mantle. Oceanic and continental plates come together, spread apart, and interact at boundaries all over the planet.
Explanation:
From Google
Hydrogen bond is not formed by 1) oxygen 2) nitrogen 3) chlorine
PLEASE HELP!!!
Answer:
Input work is the work done on a machine as the input force acts through the input distance. This is in contrast to output work which is a force that is applied by the body or system to something else. Output work is the work done by a machine as the output force acts through the output distance.Jan 15, 2020 bahsgsh bvshgs d hg
Write TRUE if the statement is correct and FALSE if the statement is wrong.
___1.Heat depends only on how fast molecules vibrate. ___2.Joule is a unit of heat energy
___3.We measure temperature with a thermometer
___4.The faster molecules vibrate; the more heat they give off.
___5.Temperature measures the average kinetic energy per molecule.
Answer:
true is the answer of first
I LEARNED THAT PLANT INDICATOR CAN
When naming acids the prefix hydro- is used when the name of the acid anion ends in___
Answer:
hydrochloric acid
Explanation:
These anions usually have the ending “-ide.” As acids, these compounds are named starting with the prefix “hydro-,” then adding the first syllable of the anion, then the suffix “-ic.” For example, HCl, which is hydrogen and chlorine, is called hydrochloric acid. More complex acids have oxygen in the compound.
What do ionic bonds contain?
Answer:
Valence Electrons
Explanation:
Answer:
Ionic bonds contain electrovalent bond
Explanation:
Ionic bond, also called electrovalent bond, type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound. Such a bond forms when the valence (outermost) electrons of one atom are transferred permanently to another atom.
HELPPPPPPPPPP! I WILL GIVE FREE BRAINLIST!
Answer:
21%
Explanation:
nitrogen takes up more than half so it can't be the 2 biggest answers cause both are more than 50 and the smallest answer would have to be for the little sliver of the pie chart
Answer: 21%
Explanation:
What product(s) are formed during this chemical reaction? (There will be two correct answers)
Ca + Na3PO3 rightwards arrow
CaNaPO3
Ca3(PO4)2
Ca2(PO4)3
Ca(PO3)2
Na
Na3
CaNa
No Reaction
Answer:
Ca3(PO4)2 and Na
Explanation:
The reaction equation is;
3Ca + 2Na3PO3 -------> Ca3(PO3)2 + 6Na
We must remember that calcium is above sodium in the electrochemical series. This implies that calcium can displace sodium from its solution. Calcium has a reduction potential of -2.87 V while sodium has a reduction potential of -2.71 V. The ion with the more negative reduction potential can easily displace the other in aqueous solution.
This explains why the reaction above is possible.
im not sure for this one please help me
Answer:
Fairly certain it is the tension of the string
Answer:It would be C
Whats Potassium bond type? Please help!
Answer:
A metallic bond.
Explanation:
Potassium is a metal (alkali metal), hence its bonds are metallic bonds.
Hope this helped!
Answer:
metallic bond............
The growth of a plant toward light is called _____.
phototropism
tropism
geotropism
It's called phototropism
Answer:
The answer is (Phototropism)
brainly is so boring like upgrade it to be better or something
Answer:
ya same here i hope so btw
Answer:
my guy, this is for school. school is boring as it is, be grateful they even provide the service they provide. cause i know for a fact if you if your using brainly, you also need help. maybe you need to upgrade to the tutor plan, someone like you needs hands on learning.
Explanation:
common sense
Question 2 (1 point)
Which of the following is the main reason the transition metals are able to exist in different forms?
а.
predictability in ability to bond
B.
unfilled d orbitals
C.
magnetic properties
D.
predictability in number of valence electrons
Answer:
B. Unfilled d orbitals
Explanation:
A beaker filled with 100 ml of water has an initial temperature of 23 degrees Celsius. After the beaker has been heated, the final temperature is 100 degrees celsius. The final volume of the water is 85.32 ml. After reaching the final temperature, there are bubbles throughout the water. What is this an example of?
Answer: The temperature of a beaker of water is 318.2 K.
Explanation:
Multiplying the temperature in Celsius by tells us how many Fahrenheit degrees above the freezing .
If 150 G of wood started Burning, and 30 G of wood ash was left behind, how many grams of CO2 to gas was released
Answer:
120G
Explanation:
From the combustion process, about 120G of carbon dioxide would be released into the atmosphere.
For the chemical reaction to obey the law of conservation of matter, if only ash and carbon dioxide are the product, then the sum of the mass of the product and that of the reactants must be the same.
In a chemical reaction, matter is not created nor destroyed, but they are simply changed from one form to another.
Mass of wood burning = mass of ash + mass of CO₂
150G = 30G + mass of CO₂
mass of CO₂ = 150G - 30G = 120G
10. Balance with coefficients.
Zn + H3PO4 > Zn3(PO4)2+H2
Answer: Zinc + Phosphoric Acid = Zinc Phosphate + Dihydrogen
Explanation:
What volume in liters of chlorine gas would be fully required to react to 125 g of Nal
Volume of Cl₂ = 9.34 L
Further explanationReaction
2NaI + Cl₂ ⇒ 2NaCl + I₂
mol NaI (MW=149,89 g/mol) :
[tex]\tt \dfrac{125}{149,89}=0.834[/tex]
mol Cl₂ : mol NaI = 1 : 2
mol Cl₂ :
[tex]\tt \dfrac{1}{2}\times 0.834=0.417[/tex]
Assumptions at STP(1 mol=22.4 L) :
[tex]\tt 0.417\times 22.4~L=9.34~L[/tex]
What are the elements in sodium phosphate?
Answer:
sodium and phosphorus
Explanation:
sodium combines with phosphorus to produce sodium phosphate
Explanation:
I hope understand this
Which of the following is a scientific question?
O A. Who made the first plant-hardiness zone map?
O B. Which plants are sold by my local nursery?
O c. Which kind of flowers should I plant in my garden?
O D. How does gravity affect the growth of plant roots?