Answer:
H₂O + CO₂ → H₂CO₃
Option D is correct.
Law of conservation of mass:
According to this law, mass can neither be created nor destroyed in a chemical equation.
This law was given by French chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
Now we will apply this law to given chemical equations:
A) H₂ + O₂ → H₂O
There are two H and two O atoms present on left side while on right side only one O and two H atoms are present so mass in not conserved. This option is incorrect.
B) Mg + HCl → H₂ + MgCl₂
In this equation one Mg, one H and one Cl atoms are present on left side of equation while on right side two H, one Mg and two chlorine atoms are present. This equation also not follow the law of conservation of mass.
C) KClO₃ → KCl + O₂
There are one K, one Cl and three O atoms are present on left side of equation while on right side one K one Cl and two oxygen atoms are present. This equation also not following the law of conservation of mass.
D) H₂O + CO₂ → H₂CO₃
There are two hydrogen, one carbon and three oxygen atoms are present on both side of equation thus, mass remain conserved. This option is correct.
A wave hits a wall as shown. A brick wall with a green arrow pointing to the wall from below and right at a shallow angle. Another green arrow starts where the first arrow touched the wall and goes up and left at the same shallow angle. As the wave interacts with a wall, which kind of wave interaction is shown?
Answer:
A wave reflection interaction (reflected by the wall)
Explanation:
In a reflection, the propagating wave is bounced off the reflecting surface because the medium of the surface prevents the propagation of the wave through it, such that wave is redirected at an angle equal to the angle of incident on the reflecting surface
Reflection takes place with the different forms of waves, such as sound wave, water waves, and light wave
The objects around us are seen with the aid of reflection of light from a light source such that the reflected light enters our eyes after being reflected on the surface of the object, and the object is seen.
Answer:
reflection
Explanation:
its on edg.
When ammonium chloride is dissolved in water, the beaker gets cold. Which type of reaction does this describe
O exothermic
O endothermic
O both exothermic and endothermic
O neither exothermic nor endothermic
Answer:
B
Explanation:
i think with exothermic reactions heat is released
this is what i looked up
hope this helps i took chem last year and think this is what i learned
Considering the definition of exothermic and endothermic reactions, the correct answer is second option: the reaction is endothermic.
Energy and chemical reactionsEnergy is the ability to do work or to produce heat.
Remembering that chemical reactions involve a reorganization of atoms between substances with breaking or formation of chemical bonds, this formation or breaking of chemical bonds is accompanied by changes in the energy of the system.
Exothermic reactionsChemical reactions that release heat are called exothermic. That is, an exothermic reaction is one where energy flows out of the system.
So, at room temperature, the heat released by a chemical reaction is enough to cause a rise in temperature.
Endothermic reactionsAn endothermic reaction is one that requires heat to take place. In other words, a chemical reaction is endothermic when it absorbs energy from the environment.
In this case, the heat is transferred from the outside to the inside of the system. By absorbing heat, the effect of an endothermic reaction is to lower the temperature.
This caseWhen ammonium chloride is dissolved in water, the beaker gets cold. That means the system is absorbing heat from the surrounding and the temperature does down.
So, the correct answer is second option: the reaction is endothermic.
Learn more about endothermic and exothermic reactions:
https://brainly.com/question/4345448?referrer=searchResultshttps://brainly.com/question/11753370?referrer=searchResultshttps://brainly.com/question/18523044?referrer=searchResultshttps://brainly.com/question/9799465?referrer=searchResultshttps://brainly.com/question/4364765?referrer=searchResultsHow much does a football weigh?
Answer:
16 oz
Explanation:
please mark as brainlist answers
Calculate the number of particles in a 0.75 gram sample of Calcium Nitrate; Ca(NO3)2
The number of particles : 2.75 x 10²¹
Further explanationA mole is a unit of many particles (atoms, molecules, ions) where 1 mole is the number of particles contained in a substance that is the same amount as many atoms in 12 gr C-12
1 mole = 6.02.10²³ particles
[tex]\tt n=\dfrac{N}{N_o}[/tex]
N = number of particles
No = Avogadro number (6.02.10²³)
n = number of moles
While the number of moles can also be obtained by dividing the mass (in grams) with the molar mass of element or molecule
0.75 gram sample of Calcium Nitrate; Ca(NO₃)₂
MW of Ca(NO₃)₂ : 164.09 g/mol
[tex]\tt mol~Ca(NO_3)_2=\dfrac{0.75}{164.09}=0.00457[/tex]
The number of particles
[tex]\tt N=n\times N_o\\\\N=0.00457\times 6.02\times 10^{23}=2.75\times 10^{21}[/tex]
Explain why the name 1-propene is incorrect.what is the proper name for this molecule
Answer:
Explanation:
Explain why the name 1-propene is incorrect what is the proper name for this molecule
The name 1-propene is incorrect because;
It is not necessary to indicate the position of the double bond. Whichever way you decide to flip it, the double bond will always be at the first carbon.The proper name for this molecule is;
PropenePropene otherwise known as propylene is simply propane with a double bond at the first carbon.
When we get to the alkenes where the naming of organic compounds becomes more complex, the numbering system is used to indicate the position of the bonds.
With propene, there are three carbon atoms and the double bond will always appear in between two of the carbon atoms.
So, it is not important to use numbers to show that the carbon is at the first carbon. This becomes necessary from the next compound, butene, where there are more carbons.
Learn more here:
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which following is found in the nucleus of the atom
Answer:
Protons and neutrons are found in the nucleus of an atom. They make up a majority of the mass of an atom. In fact, the mass number of an element is the sum of its protons and neutrons. Since protons have a positive charge and neutrons are neutral, the nucleus of an atom is electrically positive.
Explanation:
Why is change good for an
ecosystem?
Answer:
it helps the area develop and help the animals adapt
Explanation:
im new so i hope this helps
In the rock cycle, where is the energy being released?
Group of answer choices
magma
magma to igneous
igneous to sedimentary
sedimentary to metamorphic
There's a picture of the rock cycle just so you know :)
Answer:
the two major sources of energy for the rock cycle are also shown; the sun provides energy for surface processes such as weathering, erosion, and transport, and the Earth's internal heat provides energy for processes like subduction, melting, and metamorphism.
In humans, the allele for curly hair and the allele for straight hair show incomplete dominance the offspring of a curly haired person and a straight haired person will have A) Curly hair B) straight hair C) wavy hair D) Curly and straight hair
Answer:
A
Explanation:
Curly Hair
help please i would really appreciate it thanks
please help me im so lost!
Answer:
An atom consists of a positively charged nucleus, surrounded by one or more negatively charged particles called electrons. The positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. ... The nucleus of an atom contains protons and neutrons.
Explanation:
i'm smart you are too in your own way.
A little boy places an ice cube in his hot bowl of stew and then walks out of the room. When he returns, the ice cube is gone.
Based on the law of conservation of mass, what happened to the ice cube in the scenario?
a. The extreme temperature difference between the stew and the ice cube caused the ice cube's mass to be converted into energy.
b. The extreme temperature difference between the stew and the ice cube caused the stew's mass to destroy the ice cube's mass.
c. The extreme temperature difference between the stew and the ice cube caused the ice cube to change state while its mass remains the same or constant.
d. The extreme temperature difference between the stew and the ice cube caused the ice cube's mass to shrink to a barely noticeable amount.
Answer:
It's actually C
Explanation:
The Ice's mass was never destroyed, just converted therefore it would be C, which states the mass never disappeared, just changed to water.
PLEASE ANSWER!
Why are fresh vegetables sprinkled with water at the grocery store (you should use what you learned to infer the answer to this)? Use the following terms: osmosis, diffusion, passive transport, cell membrane and equilibrium in your answer.
Answer:
They do this so that water will diffuse into the vegetables and keep them plump and allow them to keep their look of freshness. 7. Roads are sometimes salted to melt ice.
Explanation:
If an astronomer was to look through a telescope and notice that a star's emitted light had a slightly red tint to it, compared to what the emitted light should be. What would that mean about that star?
Answer:
In the chapters that follow, we will provide the temperature of the stars we are describing, and this section tells you how those temperatures are determined from the colors of light the stars give off. Hubble Space Telescope image of the Sagittarius Star Cloud. The image shows many stars of various colors, white, blue, red and yellow spread over a black background. The most common star colors in this image are red and yellow. Figure 1: Sagittarius Star Cloud. This image, which was taken by the Hubble Space Telescope, shows stars in the direction toward the center of the Milky Way Galaxy. The bright stars glitter like colored jewels on a black velvet background. The color of a star indicates its temperature. Blue-white stars are much hotter than the Sun, whereas red stars are cooler. On average, the stars in this field are at a distance of about 25,000 light-years (which means it takes light 25,000 years to traverse the distance from them to us) and the width of the field is about 13.3 light-years. (credit: Hubble Heritage Team (AURA/STScI/NASA))
Color and Temperature
As we learned in The Electromagnetic Spectrum section, Wien’s law relates stellar color to stellar temperature. Blue colors dominate the visible light output of very hot stars (with much additional radiation in the ultraviolet). On the other hand, cool stars emit most of their visible light energy at red wavelengths (with more radiation coming off in the infrared) (Table 1). The color of a star therefore provides a measure of its intrinsic or true surface temperature (apart from the effects of reddening by interstellar dust, which will be discussed in Between the Stars: Gas and Dust in Space). Color does not depend on the distance to the object. This should be familiar to you from everyday experience. The color of a traffic signal, for example, appears the same no matter how far away it is. If we could somehow take a star, observe it, and then move it much farther away, its apparent brightness (magnitude) would change. But this change in brightness is the same for all wavelengths, and so its color would remain the same. Table 1. Example Star Colors and Corresponding Approximate Temperatures
Star Color Approximate Temperature Example
Blue 25,000 K Spica
White 10,000 K Vega
Yellow 6000 K Sun
Orange 4000 K Aldebaran
Red 3000 K Betelgeuse
Go to this interactive simulation from the University of Colorado to see the color of a star changing as the temperature is changed. The hottest stars have temperatures of over 40,000 K, and the coolest stars have temperatures of about 2000 K. Our Sun’s surface temperature is about 6000 K; its peak wavelength color is a slightly greenish-yellow. In space, the Sun would look white, shining with about equal amounts of reddish and bluish wavelengths of light. It looks somewhat yellow as seen from Earth’s surface because our planet’s nitrogen molecules scatter some of the shorter (i.e., blue) wavelengths out of the beams of sunlight that reach us, leaving more long wavelength light behind. This also explains why the sky is blue: the blue sky is sunlight scattered by Earth’s atmosphere.
Color Indices
In order to specify the exact color of a star, astronomers normally measure a star’s apparent brightness through filters, each of which transmits only the light from a particular narrow band of wavelengths (colors). A crude example of a filter in everyday life is a green-colored, plastic, soft drink bottle, which, when held in front of your eyes, lets only the green colors of light through. One commonly used set of filters in astronomy measures stellar brightness at three wavelengths corresponding to ultraviolet, blue, and yellow light. The filters are named: U (ultraviolet), B (blue), and V (visual, for yellow). These filters transmit light near the wavelengths of 360 nanometers (nm), 420 nm, and 540 nm, respectively. The brightness measured through each filter is usually expressed in magnitudes. The difference between any two of these magnitudes—say, between the blue and the visual magnitudes (B–V)—is called a color index. By agreement among astronomers, the ultraviolet, blue, and visual magnitudes of the UBV system are adjusted to give a color index of 0 to a star with a surface temperature of about 10,000 K, such as Vega. The B–V color indexes of stars range from −0.4 for the bluest stars, with temperatures of about 40,000 K, to +2.0 for the reddest stars, with temperatures of about 2000 K. The B–V index for the Sun is about +0.65. Note that, by convention, the B–V index is always the “bluer” minus the “redder” color. Why use a color index if it ultimately implies temperature? Because the brightness of a star through a filter is what astronomers actually measure, and we are always more comfortable when our statements have to do with measurable quantities.
Explanation:yw :P
Give two differences between the properties of iron and sodium
Answer:
Iron have 26 atomic and sodium have 11 atomic
Explanation:
The sodium is a non-transition metal. Its melting point is low and boiling points and is a soft metal, whereas iron is a transition metal with very high melting and boiling points, It is a hard metal.
What is transition metal ?The term transition metal is defined as any of various metallic elements such as chromium, iron, and nickel that have valence electrons in two shells instead of only one.
Between the s-block and p-block elements in the periodic table are transition metals. As a result, they are known as d-block elements.
Sodium is soft, has a much lower melting point than water, and reacts with it violently, producing heat and hydrogen or even exploding. Additionally, sodium and water react to create a hazardous compound.
Thus, these are difference between the properties of sodium and iron.
To learn more about transition element, follow the link;
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indicate whether the statement is true or false the ripening of a banana is an example of a chemical change
Answer:
True. Ripening of a banana is a chemical change
Who performed the oil-drop experiment?
O A. Albert Einstein
B. Robert Millikan
O C. J. J. Thomson
D. Niels Bohr
Answer: Robert Millikan
Explanation: Robert Millikan was the first person to perform the oil drop experiment. It was done many centuries ago. Hope this helps you!
When the earth formed, do you think it was the way you see it now? Explain your answer.
Answer:
No
Explanation:
I do not know
Explanation:
No because when it was formed it was a rocky lava wasteland
What converts electric energy to radiant energy and thermal energy?
Answer:
Many things, but i think a toaster...
Explanation:
(1) In an experiment for determining the density of water, the following results
were recorded.
-mass of an empty beaker = 65gm.
- mass of the beaker and water = 165gm.
the volume of water = 100Cm.
(Calculate the density of water)
Given parameters:
mass of an empty beaker = 65gm
mass of the beaker and water = 165gm
volume of water = 100cm³
Unknown:
Density of water = ?
Solution:
Density is the mass per unit volume of a substance;
Density = [tex]\frac{mass}{volume}[/tex]
To find the mass of the water ;
Mass of water = Mass of beaker and water - mass of an empty beaker
= 165g - 65g
= 100g
So input parameters and solve;
Density = [tex]\frac{100g}{100cm^{3} }[/tex]
Density of the water in the beaker = 1g/cm³
Make a suggestion on how you will deal with the problem
Answer:
is it a research work?
Explanation:
if it is first u write about what is a climate what r due to climatic changes
Answer:
《<☆HOPE IT WILL HELP YOU 》>☆
Explanation:
Dealing with the problem by
Never lose your hope you're cofidance your power
Always take dlessing or suggeation from the elder or your parent
•●○Please mark my ans as BRAIN LIST○●•
Make a suggestion on how you will deal with the problem..
Answer:
and the last name then select a City the solution if they are getting elimination method if I can tell u that is telling you about me to this email and delete this email and any attachments may contain confidential information and rupees hundred years ago the pair in the solution if I can tell you my story of my teacher not respond please ask me to this email and any attachments is intended only for the independence of Bangladesh and what is the correct answer is yes we have to come at your earliest convenience and what is the correct answer
Answer:
If you are asking to suggest a method to preserve the extinction of this species of pigeon then
1. Governments should derive a law that will prevent hunting of these pigeons.
2. These pigeons should be given a place in sanctuaries with hospitable habitat made available.
3. If someone sees a bird of this kind care should be taken not to harm it intentionally or accidentally.
4. Breeding this type of Birds should be Promoted to increase their number
PLZ ANSWER WILL GIVE BRAINLIEST
Given the data shown, what two substances react with vinegar? Hint: (+) = a reaction occurred, (-) = no reaction
Gelatin and baking powder
Gelatin and baking soda
Salt and corn starch
Baking powder and baking soda
Answer:
baking powder and baking soda
Explanation:
I know this from prior knowledge, also the graph shows the two with plus signs on vinegar, which means they both react to it. :)
Baking powder and baking soda
On the table they both have a "+" meaning a reaciton has occured.
Hope this helps, brainliest pls! :)
Which statement describes the relative energy of the electrons in the shells of a calcium atom?
Answer:
An electron in the first shell has more energy than an electron in the second shell.
Explanation:
1. How many protons?
2. What is the atomic number?
3. What element is this?
4. How many neutrons?
5. What is the mass number?
6. What is the isotope?
Answer:
1) 5 protons, 2) 5, 3) boron, 4) 6 Neutrons, 5) 10.811 ≈ 11, 6) Boron-9
Using the image above, match A-G to their appropriate part of the periodic table. (If the image does not show, click on the link above for an alternative way to access the image.)
Question 5 options:
Metals
Period
Group/Family
Noble gases
Halogens
Metalloids
Nonmetals
1.
A
2.
B
3.
C
4.
D
5.
E
6.
F
7.
G
1. A ➡️ Metals
2. B ➡️ Metalloids
3. C ➡️ Non-metals
4. D- Column ➡️ Group/Family
5. E- Row ➡️ Period
6. F ➡️ Halogens
7. G ➡️ Noble gases
Explanation:
The Periodic Table is known to be an array of chemical elements that are organized in order of their increasing atomic number. That arrangement gives a recurring pattern known as the periodic law in their properties.
Periods are found in the horizontal rows (across) the periodic table, while groups are found in the vertical columns (down) the table.
The Periodic Table was discovered by D.I Mendeleev.
Which type of compounds are formed by ions that have opposite charges?
A. molecules
B. covalent
C. ionic
D. metallic
Answer:
c
Explanation:
if you need explanation, ask freely
What is the buoyancy force on a 15 g object which displaces 60 mL of water? (Remember to change mL of water to grams and grams to kg)
25 N
0.59 N
900 N
0.25 N
Answer:
0.25
Explanation:
Answer:
.59
Explanation:
which substance is more soluble sugar or flour why does sugar is soluble??
Answer:
sugar
Explanation:
because sugar dissolves
in water, while flower because it is insoluble
PLS HELP:)Which situation will cause a stationary object to start moving?
A. A net force greater than 0
B. Balanced forces
C. A net force equal to 0
D. Two forces that cancel each other out