Answer:
the 3rd answer
Explanation:
the earth is composed of key element like carbon Oxygen nitrogen phosphorus hydrogen and sulphur CHNOPS but they are other element on earth too even though they are not as essential
đơn chất nào sau đây tác dụng với dung dịch axit sunfuric loãng sinh ra khí ?
a đồng
b cacbon
c nhôm
d lưu huỳnh
Answer:
C. Al
Explanation:
2Al+ 3H2SO4(l)------> Al2(SO4)3+ 3H2
What can you say about the reactants of photosynthesis and the products of cellular respiration?
Answer:
Photosynthesis converts carbon dioxide and water into oxygen and glucose. Glucose is used as food by the plant and oxygen is a by-product. Cellular respiration converts oxygen and glucose into water and carbon dioxide. Water and carbon dioxide are by-products and ATP is energy that is transformed from the process.
Explanation:
Which are effects of long-term exposure to mustard gas? Select all that apply. One, some, or all responses may be correct.
The effects of long-term exposure to mustard gas causes mortality and chronic respiratory disease.
Exposure to mustard gas in the long term can result in mortality from influenza, pneumonia as well as chronic breathing disease. Exposure for long term leads to respiratory complications and septic shock. Extensive breathing in the environment of mustard gas can cause chronic respiratory disease, respiratory infections or death.
Extensive eye exposure to this gas can cause permanent blindness. Exposure to mustard gas may also increase the chances of lung and respiratory cancer so we can conclude that mustard gas is lethal and can cause a number of diseases in a person who is exposed to it.
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How didMendeleev feel about Russian science education when he came back from Germany?
While he was researching and writing that book in the 1860s, Mendeleyev made the discovery that led to his most famous achievement. He noticed certain recurring patterns between different groups of elements and, using existing knowledge of the elements' chemical and physical properties, he was able to make further connections. He systematically arranged the dozens of known elements by atomic weight in a grid-like diagram; following this system, he could even predict the qualities of still-unknown elements. In 1869, Mendeleyev formally presented his discovery of the periodic law to the Russian Chemical Society.
Hope This is Ok :)
There is 200 grams of water on a stove. The water is currently 25 C. How much energy in joules must be used to raise the water to 90 C?
Answer:
q
=
64 kJ this is answer. .
Are we alone in the universe?
Answer:
no ofcourse not!
Explanation:
Answer:
no
Explanation:
the universe is way too big, maybe not in a conventional form but there are definitely aliens
wht will react with acid to giv bluish green salt nd water ??
Explanation:
When dilute HCl is added to a small amount of copper oxide in a beaker, a greenish-yellow gas is released and a bluish-green solution is formed. Since the metal oxides such as a Copper oxide (CuO) are basic in nature, it reacts with acids such as HCl to form the corresponding salt and water.
What is the mass of 1,300 cm of gasoline? The density of gasoline is 0.67 g/cm.
Answer:
Volume x Density = Mass of a substance
1300 x 0.67 = 871
The mass is 871 (unit)
Hund's rule: states that electrons always enter an empty orbital before they pair up.
Answer:
true
Explanation:
carbon reduction process is not applied for extraction of alkali metal . why ?
Answer:
The alkali metals are the highly electropositive metals. Highly electropositive metals cannot be extraction carbon reduction process, because these metals do not react with carbon
Explanation:
Which set of laboratory equipment would most likely be used with a crucible
Answer:
That should be crucible tong
Why is it possible to collect hydrogen gas over water?
What do the groups (columns) and periods (rows) tell you about the elements on the periodic table?
Answer:
Groups: The vertical column of the periodic table that signifies the number of valence electrons in an element.
Period: The horizontal rows in the periodic table that signify the number of electron shells in an element.
Explanation:
Answer:Groups: The vertical column of the periodic table that signifies the number of valence electrons in an element. Periods: The horizontal rows in the periodic table that signify the number of electron shells in an element.
Explanation:
The table has seven rows and 18 columns. Each row represents one period; the period number of an element indicates how many of its energy levels house electrons.The columns of the table represent groups, or families, of elements.
How many different types of atoms are in the formula Ba(OH)2 • 8H2O?
A)3
B)2
C)11
D)22
How many grams of hydrogen are needed to fully react 621. 9 grams of nitrogen gas.
Answer:
9 grams of nitrogen gas
Explanation:
Can somebody help me with this please?
Answer:
So what you want to do is to place sulfur on top with the two fluorine's on the bottom left and right hand side at slight angles. You don't want to make it look interconnected as one whole bond. Draw a single line from each "F" to the "S" to model two fluorine atoms bond to one sulfur atom (Single bond, only one electron is being shared between each).
Rheumatoid arthritis is a disorder in which the joints swell and cause pain. Rheumatoid arthritis causes the body’s own immune cells to attack the membrane of the joints. Which body system does rheumatoid arthritis affect?
Answer:
Immune system
Explanation:
Rheumatoid arthritis is an autoimmune disease. Normally, your immune system helps protect your body from infection and disease. In rheumatoid arthritis, your immune system attacks healthy tissue in your joints. It can also cause medical problems with your heart, lungs, nerves, eyes and skin.
Whymilk is taken as mixture
Explanation:
Main compounds of milk are lactose and casein. And it is also called a colloidal mixture (i.e. in which one substance of microscopically dispersed insoluble or soluble particles is suspended throughout another substance). Therefore milk is regarded as a mixture not as a pure substance. So this is the required answer.
Which highway run through comlumbus
Answer:
Highway 22 ,GA 31820
Explanation:
Describe the nucleus of the
atom.
Answer:
The nucleus of atom is composed of two subatomic particles that each have charges.
Protons, which are positively charged particles.Neutrons, which are neutrally charged particles.Both reside in the nucleus of an atom. The amount of protons and neutrons (Electrons can to) is what helps us identify each atom apart. Electrons are NOT in the nucleus of atom but orbit it in outer layers called orbitals.
When refering to a gas, the higher the temperature, the faster the particles move:
True
False
Answer:
TrueExplanation:
In Gas,The movement of particles depends upon their temperature. When, the temperature is high the movement of the particles is faster.When, the temperature is low the movement of the particles is slower down and move close together.Hence,
The above statement is true for, the gas particles moves faster in high temperature.
What causes streams to form?
O absorption
O precipitation
O glaciers
O lakes
Answer: essay the answer is B: precipitation
Explanation:
When an organism dies it is exposed to many different types of biotic and abiotic factors biotic factors include?
Answer:
the organisms themselves,other organisms,interactions between living organisms, and even their waste.
How do ionic bonds form?
Quick
Answer:
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.
superscript Coefficient
Me think
NEEEEEDD HELP!CHEMISTRY
1. H2O
EXPLANATIONA water molecule consists of two atoms of hydrogen linked by covalent bonds to the same atom of oxygen. Atoms of oxygen are electronegative and attract the shared electrons in their covalent bonds
ADDITIONAL INFORMATIONHow to differentiate between ionic and covalent bonds ?
There is a couple different ways to determine if a bond is ionic or covalent. By definition, an ionic bond is between a metal and a nonmetal, and a covalent bond is between 2 nonmetals. So you usually just look at the periodic table and determine whether your compound is made of a metal/nonmetal or is just 2 nonmetals.
as soda gets warm, it goes flat. why? relate this to solubility.
Answer:
It's because the solubility of gases in water is inversely proportional to the temperature, so it means when the temperature is increased, the solubility decreases, and the gases tend to get out from the soda
c) ¿Qué ocurriría si tenemos disueltos 200 g de
nitrato de potasio en 300 g de agua a 60°C
y enfriamos la disolución hasta los 10 °C?
9) What is the final pressure in the container shown below after the valve is opened and the gases are allowed
to flow? (The gases do not act)
0
4.00 am
3.00
NE
2.00 am
2.00 L
A 3.00-L container with O₂ at 4.00 atm is connected to a 2.00-L container with Ne at 2.00 atm, resulting in a final pressure of 3.20 atm in the container.
We have 2 containers connected by a valve.
One container has a volume of 3.00 L and contains O₂ at 4.00 atm. The other container has a volume of 2.00 L and contains Ne at 2.00 atm.
When the valve is opened, the total volume is the sum of the 2 containers.
[tex]V_2 = 3.00 L + 2.00 L = 5.00 L[/tex]
Assuming constant temperature and ideal behavior, we can calculate the final pressure of each gas using Boyle's law.
O₂
[tex]P_1 \times V_1 = P_2 \times V_2\\\\P_2 = \frac{P_1 \times V_1}{V_2} = \frac{4.00atm \times 3.00L}{5.00L} = 2.40atm[/tex]
Ne
[tex]P_1 \times V_1 = P_2 \times V_2\\\\P_2 = \frac{P_1 \times V_1}{V_2} = \frac{2.00atm \times 2.00L}{5.00L} = 0.800atm[/tex]
The final pressure in the container will be the sum of the final pressures of the gases.
[tex]P = 2.40 atm + 0.800 atm = 3.20 atm[/tex]
A 3.00-L container with O₂ at 4.00 atm is connected to a 2.00-L container with Ne at 2.00 atm, resulting in a final pressure of 3.20 atm in the container.
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can anyone tell me "what are the exceptions of law of reciprocal proportions??"
What is activation energy
Answer: Activation energy is defined as the minimum amount of extra energy required by a reacting molecule to get converted into product. It can also be described as the minimum amount of energy needed to activate or energize molecules or atoms so that they can undergo a chemical reaction or transformation.
Explanation:
