Answer:
3; balanced; the same number of; The Law of Conservation of Mass
Explanation:
In a physical model that shows the reaction of zinc metal and hydrochloric acid (hydrogen chloride), 3 different colors are needed to represent the different types of atoms. This represents a balanced equation because there are the same number of atoms of each element on the reactants and products side of the equation. The scientific principle represented here is The Law of Conservation of Mass .
Fish, amphibians, reptiles, birds, and mammals have similar embryos. They all start with gill slits. Fish and some amphibians grow to have gills. Some amphibians, reptiles, birds, and mammals develop lungs to breathe air
They all start with tails. Fish, some amphibians, reptiles, and birds grow tails. Humans do not keep their tails.
Fish and reptiles develop scales. Amphibians, birds, and humans have skin. Birds have feathers, and humans have hair. With which animal do humans exhibit the most linear relationship?
birds
amphibians
reptiles
fish
Answer:
Birds
Explanation: They are both mammals
Answer:
birds
Explanation:
Thermochemical Equations Project: Modeling Energy Changes
Assignment Summary In this assignment, you will write and balance a chemical equation. Then,you will use a table of enthalpy values to calculate the energy change in the reaction. Next, you will create a model of the energy change in the reaction.Finally, you will write an explanation that describes the energy change in the reaction.
Answer:
Thermochemical Equation
Thermochemistry
Thermochemical Equation
Define thermochemical equation.
Define heat of reaction.
What is the best way to heat a house?
Heating a home is becoming more and more expensive. Do we use gas, oil, electricity, wood? Part of the decision is based on which fuel will provide the highest amount of energy release when burned. Studies of thermochemistry can be very useful in getting reliable information for making these important choices.
a gas furnace
Thermochemical Equation
When methane gas is combusted, heat is released, making the reaction exothermic. Specifically, the combustion of 1 mol of methane releases 890.4 kilojoules of heat energy. This information can be shown as part of the balanced equation.
text{CH}_4(g)+2text{O}_2(g) rightarrow text{CO}_2(g)+2text{H}_2text{O}(l)+890.4 text{kJ}
The equation tells us that 1 mol of methane combines with 2 mol of oxygen to produce 1 mol of carbon dioxide and 2 mol of water. In the process, 890.4 kJ is released and so it is written as a product of the reaction. A thermochemical equation is a chemical equation that includes the enthalpy change of the reaction. The process in the above thermochemical equation can be shown visually in the Figure below .
Answer:
sorry
Explanation:
Heat transfer by radiation is a good example by which of the following.
How does plastic impact the environment as a result of human activities
Answer:
As a result of human activities, plastic impacts the envionment in negative way that leads to serious environmental danger.
Explanation:
When we don't throw away plastic materials correctly, it causes littering. Well, this can also lead to piles of that, meaning that it is spreading toxins. Littering may also lead to blockages in flowing streams, lakes, river, ground water, big bodies of water, and small bodies of water. This also can contribute to global warming because plastic are made from chemicals that come from the production of fuels like oil, gas, coal and possible more.
An electromagnetic is to classify what..
A. Matter
B. Energy
Answer:
B Energy
Explanation:
it's not an object it is some type of radiation
I need help with the true or false
Answer:
1. True
2. True
3.True
4. False
5. True
6. False
7.True
Explanation:
is a apple tree a decomposer consumer or a producer?
Answer:
It's a producer
Explanation:
2.00 L of a gas is collected at 25.0°C and 745.0 mmHg. What is the volume at 760.0 mmHg
and 273K. someone help i only have 2 mins left
Answer:
1.79 L
Explanation:
Step 1: Given data
Initial volume of the gas (V₁): 2.00 LInitial temperature of the gas (T₁): 25.0 °CInitial pressure of the gas (P₁): 745.0 mmHgFinal volume of the gas (V₂): ?Final temperature of the gas (T₂): 273 KFinal pressure of the gas (P₂): 760.0 mmHgStep 2: Convert T₁ to Kelvin
We will use the following expression.
K = °C + 273.15
K = 25.0 °C + 273.15 = 298.2 K
Step 3: Calculate the final volume of the gas
We will use the combined gas law.
P₁ × V₁ / T₁ = P₂ × V₂ / T₂
V₂ = P₁ × V₁ × T₂ / T₁ × P₂
V₂ = 745.0 mmHg × 2.00 L × 273 K / 298.2 K × 760.0 mmHg = 1.79 L
Green material has high amounts of
O carbon
O magnesium
O phosphorus
O nitrogen
What is different types of
Metal
Answer:
copper metal and steel metak
Answer:
Every element to the left of the staircase on the Periodic Table is a metal, excluding Hydrogen, and everything to the right of that staircase is a non-metal.
Explanation:
How many H atoms are in 0.170 mole of ammonium sulfate?
Answer:
8
Explanation:
Which organelle is found in both plant and animal cells?
A.Cell membrane
B.Chloroplast
C.Large Vacuole
D.Cell Wall
Answer:
Which organelle is found in both plant and animal cells? Cell wall.
Explanation:
So option D) Cell wall is your answer.
An element that is likely to combine with other elements to form new substances is said to be ______.
A. buoyant
B. chemically reactive
C. metallic
D. solid at room temperature
Answer:
B. Chemically reactive
Explanation:
A Chemically reactive element is an element that is likely to combine with another element to form new substances
The reactivity of the element depends on the number of electrons in the outermost energy level and even the distance of the outermost energy level from the nucleus. From the periodic table, Fluorine is the most reactive non-metal while francium is the most chemically reactive metal
5
#1
°Fahrenheit
314
°Celsius Kelvin
20
60
290
10
40
280
0
AN
Each dash
Each dash
counts
by...
Each dash
counts by...
counts by...
Fahrenheit:
Celsius
Kelvin
# 2
At what temperature does water freeze in Farenheit, Celsius
and Kelvin? (pg 13 ESRT)
Answer:
#2 water freezes at 32F ,0 °C ,273.2K
What is SVD in chemistry
Answer:
Singular value decomposition (SVD)
Explanation:
If u search go ogle u could find a good definition here is one I found:
"Singular value decomposition (SVD) is a technique commonly used in the analysis of spectroscopic data that both acts as a noise filter and reduces the dimensionality of subsequent least-squares fits." credit: science direct <3
Hope this helps! :) Plz mark brainliest!
What chemical is banned by the Toxic Substances Control Act (TSCA)?
potassium
cyanide
lead
none of the above
Answer:
Lead
Explanation:
Which of these shows the correct hierarchical sequence?
organs cells ▸ tissues ► organ systems
cells ► tissues ► organs organ systems
organ systems tissues › cells organs
tissues cells organs ► organ systems
Answer:
cells -> tissues -> organs -> organ system
Answer:
Cells > tissues > Organs > Organs Systems
Explanation:
tissues are made of a group of cells
a specific organ is made up of a geoup of specific type of tissues
and a group of organs make up the organs system
What are molecules, and how are the properties of molecules different from the atoms they come from? Give an example.
Answer:
Molecules are the smallest particle of a compound or element which can be found in nature as a free entity and made up of atoms bonded together. The molecules can not take part in the chemical reaction on their own directly.
An atom is on other hand is the smallest particle that does not exist free in nature and bonded together to form molecules and involves in the chemical reactions directly.
Therefore we can say that the molecules are formed by atoms while the atom exists as an entity in nature.
Which of the following describes the characteristics of a solid?
Answer:
They have a definite shape and volume. The particles are very close and compacted together.
Explanation:
Some students decide to plant their own garden. They want to eat a more plant-based diet For meat, they will buy locally from a butcher. Any remaining scraps will be composted and used as fertilizer for their garden Which part of this plan represents recycling to reduce their waste?
composting scraps
planting a garden
eating a plant-based diet
buying locally
Answer:
composting scraps
recycling is the action or process of converting waste into reusable material.
Tiana is a chemist who is making a chemical to add to swimming pools in order to make the water safer. she mixed two solid substances together in a sealed container. the diagram above shows the repeating groups of atoms that make up the two starting substances. After mixing, Tiana found two liquid substances in the sealed container. (Nothing had escaped.) Which of the diagrams to the left shows the repeating groups of atoms that make up the ending substances?
Explanation:
chemical to add to swimming pools in order
to make the water safer. She mixed two solid
substances together in a sealed container.
The diagram above shows the repeating
groups of atoms that make up the two
starting substances.
After mixing, Tiana found two liquid
substances in the sealed container.
(Nothing had escaped.) Which of the
diagrams to the left shows the repeating
groups of atoms that make up the ending
substances?
Answer:
Where are the pictures????
Explanation:
1- beaver
2- eastern mole
3- opossum
4- woodchuck
I have four questions hope you can help me
Answer:
2+2 kaszkqkq
Explanation:
The concentration of Mg2+ in seawater is 0.052 M. At what pH will 76% of the Mg2+ be precipitated as the hydroxide salt? [Ksp for Mg(OH)2 = 8.9 ✕ 10-12.]
Answer:
At pH 4.85 , 76% of [tex]Mg^2^+[/tex]will be precipitated as the hydroxide salt.
Explanation:
When 76% of [tex]Mg^{2}^{+}[/tex] has precipitated out , 24% remains out.
Given= Ksp for [tex]Mg(OH_2) = 8.9\times10^-^1^2[/tex]
(Here , ksp is the molar solubility )
Now ,
[tex][Mg^{2}^{+}] =\frac{24}{100}\times 0.052[/tex]
= [tex]1.248\times10^-^2[/tex]
[tex]Mg(OH)_2<=> Mg^2^+ + 2OH^-[/tex]
We , know the formula to find out the ksp ,
Given formula is -
[tex]Ksp = [Mg^2^+][OH^-][/tex]
Now , putting the given values ,
[tex]8.9\times 10^-^1^2= 1.248\times10^-^2\times[OH]^-[/tex]
[tex][OH]^- = 7.131\times 10^-^1^0[/tex]
Now , calculating the pH,
[tex][H^+]=\frac{Kw}{[OH]^-}[/tex] ( where Kw is the ionic product of the water)
[tex]= \frac{10^-^1^4}{7.131\times10^-^1^0}[/tex]
[tex]1.402\times10^-^5[/tex]
[tex]pH=-Log[H^+][/tex]
[tex]-Log[1.402\times10^-^5][/tex]
= 4.85
Therefore , the pH to be precipitated is 4.85
pH measures the acidic or the basic concentration of the substance in a solution. At pH 4.85, the magnesium ion will precipitate as its hydroxide salt.
What is pH?The potential of hydrogen is calculated as the negative log of the hydrogen ion concentration in the aqueous solution.
The balanced reaction is shown as,
[tex]\rm Mg(OH_{2}) \Leftrightarrow Mg^{2+} + 2OH^{-}[/tex]
If, 76% magnesium precipitates then 24% will remain in. The concentration of the remaining magnesium will be,
[tex]\begin{aligned} \rm [Mg^{2+}] &= \dfrac{24}{100}\times 0.052\\\\&= 1.248 \times 10^{-2}\end{aligned}[/tex]
The molar solubility is calculated as:
[tex]\begin{aligned} \rm Ksp &= \rm [Mg^{2+}][OH^{-}]\\\\8.9 \times 10^{-12} &= 1.248 \times 10^{-2} \times \rm [OH^{-}]\\\\&= 7.13 \times 10^{-10}\end{aligned}[/tex]
The concentration of the hydrogen ions is calculated as:
[tex]\begin{aligned} \rm [H^{+}] &= \rm \dfrac{Kw}{[OH^{-}]}\\\\&= \dfrac{10^{-14}}{ 7.13 \times 10^{-10}}\\\\&= 1.402 \times 10^{-5}\end{aligned}[/tex]
Further, pH is calculated as:
[tex]\begin{aligned} \rm pH &=\rm -log [H^{+}]\\\\&= -\rm log [1.402 \times 10^{-5}]\\\\&= 4.85\end{aligned}[/tex]
Therefore, at 4.85 pH the magnesium ion will precipitate out as hydroxide salt.
Learn more about pH and precipitation here:
https://brainly.com/question/15584956
2. Tania went outside and made two observations of the Moon that were several days apart. Her
observations are shown in the diagram above. The light part of the Moon appeared to get larger over
time. Why did this happen?
Answer:
I am very confused who is diagram.
Explanation:
1. Mr. Brown weighs 670 newtons and he climbed a ladder that was 5 meters
high. How much work did he do?
What is the compound N203 called?
Why to you do that this app doesn’t tell me anything
PLEASE HELP! DUE IN 5 MINS SUPER EASY CHEMISTRY!!
Which of the following compounds contain the largest number of atoms?
Answer:
C
Explanation:
Since they all are 2 mols worth, all you have to do is count the number of atoms in each molecule
H2SO4 contains 2 hydrogen 1 sulfur 4 oxygen = 7 atoms
H2S contains 2 hydrogen and 1 sulfur = 3 atoms
H3PO4 contains 3 hydrogens 1 phosphorus 4 oxygens = 8 atoms
HNO3 contains 1 hydrogen 1 nitrogen and 3 oxygens = 5 atoms
You have the right answer.
Identify the products for Ca + H2O(l)
Answer:
i
Explanation:
Answer:
Ca(OH)2 + H2
Explanation:
hope this helps