Answer:
its metal because its metal
why are state symbols used in chemical equations
Answer:
state symbol meaning
[s] solid
liquid
gas
aq] aqueous dissolved in water
Explanation:
often chemical equations are written showing the state that each substance is in. the [s] sign means that the compound is a sold. the l sign means the substance is a liquid. the aq sign stands for aqueous in water and means the compound is dissolved in water
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Unsaturated compounds _____.
do not readily react
have a high activation energy
require UV light to react
are very reactive
Answer:
are very reactive
Explanation:
What is the kinetic energy of a 5 kg object moving at 7 m/s?
Answer:
122.5 Joule, or 122.5 j
Explanation:
Given,
mass of the object (m) = 5 kg
velocity of the object (v) = 7 m/s
Kinetic energy = [tex]\frac{1}{2}[/tex] × m × v²
Applying the formula:
Kinetic energy = [tex]\frac{1}{2}[/tex] × 5 × 7²
⇒ [tex]\frac{1}{2}[/tex] × 5 × 7 × 7
⇒ [tex]\frac{245}{2}[/tex]
⇒ 122.5 Joule, or 122.5 j
Kinetic energy is the energy that an object gains as the result of the motion. It also depends on the mass of the object and force with which the motion is applied. In the given question, the mass of the object is 5 kg and the force of the velocity by which it is moving is 7 m/s.
Why are there multiple types of ramps in the park?
Answer:
Each person has their own skill level. The smaller ramps are less risky and are for more beginner to amateur skaters. The larger ones are very risky but can be very nice if a person does tricks with it. They are geared for more experienced skaters. Different ramps allow for more people to hace fun skating without the risk of injury...
If Veronica spins in a circle with the compass in her hand, which force keeps the compass' needle pointing north?
A.
an electrical force
B.
a magnetic force
C.
a contact force
D.
a gravitational force
If Veronica spins in a circle with the compass in her hand, then the force which keeps the compass' needle pointing north is magnetic field.
What is magnetic force?The magnetic influence on moving electric charges, electric currents, and magnetic materials is described by a magnetic field, which is a vector field. In a magnetic field, a moving charge receives a force that is perpendicular to both its velocity and the magnetic field.
The magnetic field is defined as a region where the force is active along imaginary lines. This force has an effect on all magnetized objects from the south magnetic pole to the north magnetic pole, including the needle of a compass. The needle always points north magnetic pole under the influence of the Geomagnetic field.Hence the required force is a magnetic force.
To know more about magnetic forces, visit the below link:
https://brainly.com/question/14411049
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What questions, if we were to answer them, would
help us figure out why our hands feel colder when
they are wet than when they are dry?
Answer:
When our bodies are dry and wind blows by, we lose some energy to the air molecules. When are bodies are wet, we have a substance on our skin that likes to absorb heat. So when wind blows by, we lose a LOT of energy to the air molecules. When the body loses heat energy, our body temperature drops.
Explanation:
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What mass of nitrogen monoxide is formed in the reaction of 869kg ammonia and 2480kg oxygen gas? (Please show work)
Answer:
1533.6 kg NO
Explanation:
The reaction that takes place is:
4NH₃ + 5O₂ → 4NO + 6H₂OFirst we convert the masses of ammonia (NH₃) and oxygen gas (O₂) into moles, using their respective molar masses:
NH₃ ⇒ 869 kg ÷ 17 kg/kmol = 51.12 kmol NH₃O₂ ⇒ 2480 kg ÷ 32 kg/kmol = 77.5 kmol O₂77.5 kmol of O₂ would react completely with (77.5 kmol O₂ * [tex]\frac{4kmolNH_3}{5kmolO_2}[/tex]) 62 kmol of NH₃. There are not as many kmol of NH₃, so NH₃ is the limiting reactant.
Now we calculate how many kmol of NO are produced, using the limiting reactant moles:
51.12 kmol NH₃ * [tex]\frac{4kmolNO}{4kmolNH_3}[/tex] = 51.12 kmol NOFinally we convert kmol of NO to mass, using its molar mass:
51.12 kmol NO * 30 kg/kmol = 1533.6 kg NOwhich of the following is an example of an empirical formula?
A. C4H10
B. C2H6
C. CO2
D. H2O2
A common liquid contains 11.19% hydrogen
and 88.81% oxygen by mass.
a) Calculate the number of moles of hydro-
gen atoms and oxygen atoms in 100.0 g of
this liquid
b) Calculate the number of hydrogen and
oxygen atoms in 100.0 g of this liquid.
c) Knowing that the molar mass of this liquid is
18.00 g.mol', calculate how many moles of
hydrogen atoms, and how many moles of
oxygen atoms are present in a mole of this
substance.
d) What is the number of hydrogen and oxy-
gen atoms present in one molecule of this
substance. Deduce the molecular mass of
this liquid and write its molecular formula.
Guys I know its a big question but I really am confused I don't understand I really hope u help me thankk youu
Answer:
a-72.8213 mol
b-32 atoms
c-81736.817291 mol
d-62/7362 (ohms law)
I =q/t
The peppered moth population in a locality has light and dark moth varieties. Which moth variety is likely to survive if the environment of the locality becomes highly polluted? (3 points)
a
The dark variety, as they are not visible on the dark tree barks
b
The dark variety, as they are not visible on the light tree barks
c
The light variety, as they are not visible on the dark tree barks
d
The light variety, as they are not visible on the light tree barks
Answer:A
Explanation: yes
Explanation: its c
becuase iknow
Which of the following measurements are required to find the work done on an object?
1. The mass and volume of the object
2. The volume of the object and the distance the object moved
3. The force exerted on the object and the distance the object moved
4. The force exerted on the object and the time it took to move the object
Answer:
1.p=mV................
1. How many moles of NaCl would be contained in .750 L solution with a molarity of
0.45M?
Answer:
[tex]\boxed {\boxed {\sf 0.3375 \ mol \ NaCl}}[/tex]
Explanation:
Molarity is found by dividing the moles of solute by liters of solution.
[tex]M=\frac{moles \ of \ solute }{liters \ of \ solution}[/tex]
We know the molarity is 0.45 M and there are 0.750 liters of solution. The solute is NaCl (sodium chloride). We can substitute the values into the formula.
[tex]0.45 \ M = \frac{ moles \ of \ NaCl}{ 0.750 \ L }[/tex]
The molarity (M) can also be represented by mol/L
[tex]0.45 \ mol/L = \frac{ moles \ of \ NaCl}{ 0.750 \ L }[/tex]
We are solving for the moles of solute, so we must isolate the numerator. It is being divided by 0.750 liters. The inverse operation is multiplication, so multiply both sides of the equation by 0.750 L.
[tex]0.750 \ L * 0.45 \ mol/L = \frac{ moles \ of \ NaCl}{ 0.750 \ L }*0.750 \ L[/tex]
The liters will cancel out.
[tex]0.750 * 0.45 \ mol = { moles \ of \ NaCl}[/tex]
[tex]0.3375 \ mol \ = moles \ of NaCl[/tex]
There are 0.3375 moles of NaCl in a 0.750 liter solution with a molarity of 0.45 M.
Does this model demonstrate the conversation of matter?how do you know?
Answer:
No, the model does not demonstrate the conservation of matter
Explanation:
The principle of conservation of matter states that matter can neither be created nor destroyed but is transformed from one form to another.
If we look at the model presented, the products on the right hand side and the reactants on the left hand side, we will notice that there is a loss of matter from left to right.
As a result of this, the model does not show the principle of conservation of matter.
what happen when Nacl solution reacts with AgNo3solution .name the two types of reactions to which does it belong
Explanation:
A chemical reaction where two chemical compounds exchange ions with each other is called a double displacement reaction.
Also, when an insoluble salt is formed due to chemical reaction between two chemical compounds is called a precipitation reaction.
For example, [tex]NaCl(aq) + AgNO_3(aq) \rightarrow NaNO_3(aq) + AgCl(s)[/tex]
Here, ions are exchanged between the compounds [tex]NaCl[/tex] and [tex]AgNO_3[/tex] . Also, [tex]AgCl[/tex] is the precipitate formed.
whats the number of moles of O2(g) needed to completely react with 8 moles of CO(g).
Both prokaryotes and eukaryotes have small, free-floating organelles. The cell makes these organelles from nucleic acids and amino acids found in food. Without these organelles, the cell could not make proteins. What are these organelles called? A. chloroplasts B. mitochondria C. ribosomes D. vesicles
Answer:
C. ribosomes
Explanation:
Both prokaryotic and eukaryotic cells contain certain structures called ORGANELLES. They possess some in common and others are not found in one or the other. According to this question, a small, free-floating organelle made from nucleic acid and amino acid is found in both eukaryotes and prokaryotes. This organelle is RIBOSOMES.
Ribosomes are organelles responsible for the synthesis of protein in both eukaryotes and prokaryotes. They can be found free-floating or attached to endoplasmic reticulum. Ribosomes are predominantly made of RNA (nucleic acid) and proteins i.e. Ribosomal RNA (rRNA) and proteins is their structural constituent. Hence, the organelle in this question is RIBOSOME.
Who discovered electrons using Crookes tubes?
a.) Democritus
b.) Ernest Rutherford
c.) Hantaro Nagaoka
d.) J. J. Thomson
e.) John Dalton
f.) Niels Bohr
Answer:
D. j.j thomson is the correct answer
Explanation:
just answered a similar question
1. Matter is anything that has and takes up mass and occupies space why is it saying it's wrong Pls help
Answer:
Matter is anything that has mass and takes up space.I think there is takes up already synonym to occupies.
how many meteor showers does the earth pass through as it orbits the sun?
Answer:
about 30 meteor showers
Explanation:
Ude was asked by his teacher to draw an angle that measures 130 degrees. He isn't even sure where to start. Explain to Jude how you would use a protractor to draw this angle.
Answer:
Explanation:
To construct an angle of 130 degrees;
The first thing to do is to bisect a given line segment.
Let's say we measure an even straight line A to B. Line A to B is assumed to be 10 cm. Then, we will choose any convenient radius and draw an arc at A and B.
Then, we proceed by draw arcs to cut each other at P and Q. Join |PQ| to cut |AB| at R. R is the midpoint of |AB|.
After, we bisect a given line segment where point R which is half of line AB.
Using the R to B side;
Then, we place our protractor at R; Starting from zero degrees with the horizontal line (parallel to side B) . we mark out angle 130° after we have counted all the way from 0° to 130°. At 130°, we mark out the point (X) on the paper and draw the extended line till it joins at R.
The angle from B to X is angle 130°
Balance this chemical equation
Answer:
3
Explanation:
On the left side we have 3 Calcium atoms and 6 fluorine atoms
that means there need to be the same number on the right side
in the CaF2 molecules we already have 2 fluorine atoms so by multiplying with 3 we get 3 Ca and 6F
What most accurately explains whether liquid water or ice has a higher density, and why?
A) Ice has a higher density. Substances are always denser as solids than they are as liquids because the particles of solids have less energy to move and crowd closer together.
B) Liquid water has a higher density. Substances are always denser as liquids than they are as solids because the vibrations of solid particles create larger gaps between them.
C) Liquid water has a higher density. Ice crystals have an open hexagonal structure with some empty space in the middle, while liquid water does not.
D) Ice has a higher density. Solid ice has strong hydrogen bonds that hold the particles closer together, while liquid water does not form hydrogen bonds.
Answer:
I think your answer is either b or c but I think b is more likely to be your answer
balance:
Fe2(SO4)3 +
_K[OH] —> _K2[SO4] +
K[SO] + Fe[OH]3
Balance the reaction of Fe2(SO4)3 + KOH = K2SO4 + Fe(OH)3 using this chemical equation balancer! ... Fe2(SO4)3 + 6KOH → 3K2SO4 + 2Fe(OH)3 ...
Missing: _K[ | Must include: _K[
Answer:
Fe2(SO4)3 + 6 KOH → 2 Fe(OH)3 + 3K2SO4
Explanation:
How many more valence electrons does chlorine need to satisfy the octet rule? Chlorine is in group 17
Answer:
1
Explanation:
Octet meaning 8. So if chlorine already has 7 valence electrons it will only need to get 1 more to be satisfied.
balance:
_H3[PO4] —> _H4[P2O7] + _H2O
Answer:
2
Explanation:
Answer:
2H3[PO4] —> H4[P2O7] + H2O
Explanation:
Zinc metal reacts with hydrogen chloride to form zinc chloride and hydrogen gas
Answer:
Explanation:
The metal zinc readily reacts with hydrochloric acid to produce hydrogen gas (H2) and zinc chloride (ZnCl2). Every chemical reaction either produces or absorbs heat. In chemistry this effect is described as the reaction enthalpy. The zinc reaction produces the heat and hence has the negative enthalpy.
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Activity 7: Crossword Puzzle
Directions Complete the crossword by filling in the word that describes each clue
Across:
2. with two symmetrical shells - mirror images of each other.
the term "crinoid" means
5. rocktype made of layers of sand and clay
7. multicellular organisms that often live in colonies
Down:
1. exoskeletons are made up of this material
4. lived inside their shells
6. phylum where starfish and sea urchins belong
8. individuality of coral is called
Need answer po
Answer: 2. with two symmetrical shells - mirror images of each other.
the term "crinoid" means: 6. phylum where starfish and sea urchins belong
4. lived inside their shells: 1. exoskeletons are made up of this material
7. multicellular organisms that often live in colonies: 8. individuality of coral is called
Explanation:
Crinoid is a term that can be used to describe the radial symmetry of animals that have oral (side of mouth) and aboral surfaces (opposite to the mouth). It is characterized by the mouth at the top surface and surrounded by the arms for feeding it. This is a characteristic feature of animals like star fish and sea urchins and echinoderm animals.
The exoskeleton is a protective shell which protect the animal from the external environment like water, sunlight and predation.
The multicellular organisms that live in the colonies they form coral reef and individually the are called the coral polyp.
Will be giving brainliest for correct answer.
2KI+Pb(NO3)2
Create a balanced equation for the Lead (II) nitrate and potassium iodide solution.
What's the reaction type?
I believe its a double replacement and redox reaction. Correct me if I'm wrong.
I will be reporting random answers
Answer:
The balanced chemical equation is Pb(NO3)2 + 2KI produces PbI2 + 2K(NO)3. In chemistry, this is called a double replacement reaction. Lead nitrate and potassium iodide, which are the reactants, are powders that react to form a yellow-colored lead iodide and a colorless potassium nitrate.
Explanation:
Answer:
2KI+Pb(NO3)2 ⇒ PbI2 + 2KNO3
Only 2.5% of Hydrosphere are freshwater, if only 31% of it are groundwater which we can drink right away, how many percent of our hydrosphere can be used as drinking water?
a. 0.78%
b. 1.73%
c. 12.4%
d. 28.5%
Answer:
a. 0.78%
Explanation:
Given data:
Total percentage of hydrosphere = 2.5%
Percentage of ground water = 31%
Percentage of hydrosphere we use for drinking = ?
Solution:
Percentage of hydrosphere we use for drinking = Percentage of ground water /100 × Total percentage of hydrosphere
By putting values,
Percentage of hydrosphere we use for drinking = 31 / 100× 2.5
Percentage of hydrosphere we use for drinking = 0.78%
The tube that stores sperm cells
Answer:
here is the answer
Explanation:
The epididymis
Answer:
Vas deferens.
Explanation:
A long tube that is located near each testicle. The epididymis is the tube which moves the sperm from the testicles. Vas deferens. This is a tube in which the sperm is stored and it carries the sperm out of the scrotal sac.