QUESTION OF THE DAY!
A student found a spider, tick, fly, and a bee in his backyard. After studying their bodies and doing some research, he concluded that their _____ performs the major life functions.
Wings
Legs
Eyes
Cells
The chemical combination of two or more substances which can ONLY be separated by chemical means is called a(n) ________________. A) Element B) Orbit C) Mixture
Which statement about an element’s average atomic mass is correct? a. It is determined by counting the number of isotopes in a sample of the element. b. It is equal to one-twelfth the mass of the most common isotope. c. It is a weighted average, so common isotopes have a greater effect than uncommon ones. d. It is based on an isotope’s charge, so negatively charged isotopes have a greater effect than positive ones.
The answer is: C. It is a weighted average, so common isotopes have a greater effect than uncommon ones.
Isotopes are chemical elements with same atomic number, but different mass number (different number of neutrons).
Isotope of chlorine-35 has mass number 35. Mass number is sum of protons and neutrons, so number of neutrons in chlorine-35 is 18 (35-17).
Isotope of chlorine-37 has mass number 37. It has 20 neutrons (37-17).
Because the average atomic mass is closer to chlorine-35, there is more this isotope in nature.
Consider the following equation in chemical equilibrium.
C2H4(g) + H2(g) = C2H6(g) + 137 kJ
What happens to the amount of ethane (C2H6) when the temperature of the system is increased?
A.The amount of ethane decreases.
B.The amount of ethane increases initially and then decreases.
C.The amount of ethane increases.
D.The amount of ethane decreases initially and then increases.
What is number 3-6....plz help
ANSWER QUICK I AM RUNNING OUT OF TIME WILL BRAINLY, FRIEND, THANK, RATE YOU CAN PICK IF ANSWER CORRECTLY i have 6 ?s ANSWER I WILL BRAINLY Which storm is likely to cause quick destruction along a narrow path?
A.
tornado
B.
hurricane
C.
thunderstorm
Which clouds are best associated with a thunderstorm?
A.
high cumulonimbus
B.
towering funnel clouds
C.
swirling clouds with a calm center
Which statement best describes the formation of a hurricane?
A.
Air pressure differences over the ocean cause fast, spinning winds.
B.
An updraft of warm, moist air builds a cumulonimbus cloud.
C.
A downdraft of air meets spinning updrafts.
How are hurricanes and thunderstorms similar?
A.
Both cover an area as large as 650 km.
B.
Both involve the formation of large cumulonimbus clouds.
C.
Both form when warm air rises, then cools quickly to form clouds.
Is this statement true or false?
Hurricanes are classified by three stages in which updrafts of air billow up, updrafts and downdrafts swirl the wind up and down, then downdrafts cause clouds to come apart.
A.
True
B.
False
Which severe weather condition forms over warm, tropical areas?
Answer:
1. A. Tornado
2. A. High cumulonimbus
3. A. Air pressure differences over the ocean cause fast, spinning winds.
4. C. Both form when warm air rises, then cools quickly to form clouds.
5. B. False
6. A. Tornado
Explanation:
A tornado is a column of air with high angular velocity whose lower end is in contact with the earth's surface and the upper end with a cumulonimbus cloud. It is short and short in duration, ranging from seconds to over an hour and destroying what is in its path on a narrow path.Storm clouds have their origin in the cumulus type. They are the ones that are isolated and that look like a white cotton ball.If it continues to grow, its upper part will be rounded and form like a small bald spot, called cumulonimbus calvus. Now they are associated with huge waterspouts, but without an electrical device. When lightning and thunder appear, we will have reached the mature phase of the storm and there is talk of cumulonimbus capillatus. Its upper part resembles a chapel or anvil, that is, the storm in its purest form.
Hurricanes are formed by the accumulation of thunderstorms that move over warm ocean waters. When the warm air from the storm and the ocean surface combine, they begin to rise in eddies. This generates low pressure on the ocean surface.The scale with which the intensity of hurricanes is measured is known as Saffir-Simpson, and it divides them into 5 categories according to the speed of their winds and cyclonic activity, which is an abnormal increase in sea level after a storm. The scale also calculates the damage that can occur when the hurricane makes landfall.how can you make a solution saturated
Check all items common to bases. More than one answer can be chosen.
minerals
metals
gases
H+
OH-
nitrogen
Answer: Metal, OH-.
Explanation:
Bases are characterized by the formation of OH- which results when the bases are dissolved in water. Bases that produce many OH- ions in water solution are strong bases. Those that produce few OH- are weak bases. Since it produces hydrogen and hydroxide ions, water has characteristics of both acids and bases.
All bases contain at least one metal plus hydrogen and oxygen combined in a hydroxide ion.
Hope this helps!
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Bases can be neutral molecules, anions, or cations that accept protons to form water. The hydroxide ion is a characteristic feature of common bases.
Explanation:Bases fall into three categories: neutral molecules like H₂O, NH3; anions like OH¯, HS¯; and cations like [Al(H₂O)5OH]²†. Common bases include NaOH and Ca(OH)2 that contain the hydroxide ion OH¯. Bases accept protons from acids to form water through the reaction: H+ + OH¯ → H₂O.
the practice of plowing fields along the curves of a slope is called?
Answer:
Contour Plowing
Explanation:
Which statement best describes the organelles in a cell?
A.
All organelles are involved directly with communication between cells.
B.
Organelles must work together and their activities must be coordinated.
C.
Organelles function only when there is a disruption in homeostasis.
D.
Each organelle must function independently of the others in order to maintain homeostasis.
The best description of organelles in a cell is that they must work together and have coordinated activities. Each organelle has a unique role that contributes to the cell's overall function, much like organs in a body.
Explanation:The question asks which statement best describes the organelles in a cell. The correct answer is B. Organelles must work together and their activities must be coordinated. This is because in a cell, each organelle has a specific function, and they all contribute to the overall health and functionality of the cell, much like the organs in our body. The nucleus acts as the control center, containing DNA and orchestrating the activities of the cell. Cytosol provides the medium for biochemical reactions. The cytoskeleton supports the structure and scaffolds the organelles. Cells communicate with each other and their environment to respond to stimuli and maintain homeostasis. This coordination and communication are essential for the survival and operation of both single-celled and multicellular organisms.
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Which of these equations is balanced? a. H2SO4 + 2Al → Al2(SO4)3 + H2 b. 2KCl + Pb(NO3)2 → 2KNO3 + PbCl2
energy from the sun travels to the earth through
A. convection
B. carbon dioxide
C. radiation
D. infared radiation
Answer:
D. Infrared Radiation
I hope this helps.
Each of the compounds that you tests contained chlorine, which is a poisonous gas. Why was this test safe to perform (it was, or your lungs would have turned to mush) without a gas mask?
Chlorine Gas by itself is dangerous
Many compounds we use often contain chlorine, but we are still alive. When chlorine is part of a compound, such as table salt (NaCl) it remains fairly unreactive. It becomes dangerous when it's in the form Cl2. This is chlorine gas and it is quite reactive.
five examples of failed experiments that produced valuable information
The following examples of failed experiments that produced valuable information
1) Bubble Wrap: The scientists were trying for trendy new textured wallpaper, they failed miserably ,however the new wrap was a breakthrough in packing industry
2) Pacemaker: During development of a heart rhythm recording device, Greatbach pulled out the miss sized small resistor which sounded like a human heartbeat and thus leads to development of pacemaker
3) Synthetic Dyes are also discovered during synthesis of antimalarial drug
4) Radioactivity : it was also a serendepity
5) Discovery of penicillin.
QUESTION 3
What are the results of desertification?
loss of farmland
populations will increasingly immigrate to deserts
sand increases the destruction of predators
increase in vegetatation
The result would be: loss of farmland
Answer:
Loss Of Farmland :P
Explanation:
In comparison to the rock it intrudes, what is the relative age of a dike?
always older than the rock it intrudes
always younger than the rock it intrudes
always older than the very top layer
always older than the last layer it intrudes
Always younger then the rock it intrudes is the right answer)
Does hot water tend to rise or sink?
Electrons move in what is called an atoms electron _______. Plz help me
What type of elements are most likely to form more than one type of ion
Answer: Naming Compounds and Writing Formulas
1. The elements most likely to form more than one type of ion are the____ Transition Metals
2. The name iron (ll) indicates that a compound contains___ Iron ions with a 2+ charge
3. Alkali metals, alkaline earth metals, and aluminum all form ions with positive charges equal to___ The group number
4. In the name carbon dioxide, the prefix of the second word indicates that molecule of carbon dioxide contains___Two oxygen atoms
Explanation:
Which of the following substances has
a higher melting point than water?
A salt
B sugar
C flour
D all of the above
Answer:
D all of the above
Explanation:
Melting point represents the exact temperature at which the solid state changes to the liquid of a given substance. Water is one of the most commonly used elements to exemplify the melting point principle. For this solid state (ice) to take the form of liquid water, it must be exposed to a temperature of at least 0 °C. Thus, the melting point of water is equal to 0 °C.
The salt has a melting point of 801 ° C, the melting point of sugar is 185 ° C and the melting point of flour is 264 ° C. From this we can see that all these products have a higher melting point than water.
which type of seismic wave produces the most severe ground movement?
a chemical formula shows the kind and number of Atoms that form a what? compound, mixture, solution, or suspension
A chemical formula shows the kind and number of atoms that form a compound.
What is compound?Any substance made up of similar molecules with atoms from two or more different chemical elements is referred to as a chemical compound.
Atoms from more than 100 different chemical elements, both in their pure forms and when mixed to form chemical compounds, make up all matter in the universe.
Atoms combine to form a compound. For example hydrogen when combine with oxygen it form a water.
A compound is a completely chemically pure entity that is created from two or more separate chemical ingredients. They are kept together by chemical bonding and have an established atom composition.
Therefore, A chemical formula shows the kind and number of atoms that form a compound.
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If a urine sample has a pH of 4.60, calculate the concentrations of H3O+ and OH- in the sample
pH = 6.0 = - log [H3O+] taking anti log both sides we have 10^-6 = [H3O+] [OH^-] = Kw/[H3O+] = 1x 10^-14/10^-6 = 10^-8.
What is pH?pH is a numerical indicator of how acidic or basic aqueous or other liquid solutions are. The phrase, which is frequently used in chemistry, biology, and agronomy, converts the hydrogen ion concentration, which typically ranges between 1 and 1014 gram-equivalents per liter, into numbers between 0 and 14.
The hydrogen ion concentration in pure water, which has a pH of 7, is 107 gram-equivalents per liter, making it neutral (neither acidic nor alkaline). A solution with a pH below 7 is referred to as acidic, and one with a pH over 7 is referred to as basic, or alkaline.
The first employed the measurement to describe the hydrogen ion concentration of an aqueous solution, expressed in equivalents per liter.
Therefore, pH = 6.0 = - log [H3O+] taking anti log both sides we have 10^-6 = [H3O+] [OH^-] = Kw/[H3O+] = 1x 10^-14/10^-6 = 10^-8.
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FeO+HNO3➡
Chemistry reaction
Final answer:
The reactions listed are examples of redox reactions involving iron and various reagents, demonstrating the oxidation and reduction processes in iron chemistry when FeO reacts with HNO3 and other similar compounds.
Explanation:
The provided information suggests a variety of chemical reactions involving iron compounds reacting with different reagents. For instance, when FeO reacts with HNO3, a typical reaction might involve the iron(II) oxide (FeO) being oxidized to iron(III) nitrate, while nitric acid acts as the oxidizing agent and gets reduced in the process. Other reactions listed include the transformation of iron in different oxidation states, the reaction of iron compounds with bases and acids, and the decomposition of iron salts under heat.
These reactions represent a class of redox reactions, where transfer of electrons occurs, indicating changes in the oxidation states of the involved species. Examples given such as Fe being heated in air (oxidation), and the interaction of Fe(NO3)2 with HNO3 in the presence of air show the complexity and variety of iron chemistry.
List the five characteristics a substance must have to be a mineral. Explain why coal and a glass marble are not minerals.
(This is chemistry right?)
A mineral must be naturally occurring, inorganic, solid, have a definite chemical composition, and an ordered internal structure. Coal and glass marbles are not minerals because coal comes from organic matter and glass marbles lack crystal structure and are not naturally occurring.
Explanation:A substance must have five distinct characteristics to be considered a mineral. These characteristics include 1) being naturally occurring, 2) being inorganic, 3) being solid, 4) having a definite chemical composition, and 5) having an ordered internal structure. Coal is not considered a mineral because it comes from organic matter (plant remains). Glass marbles are not minerals because they do not have a crystal structure, and they are man-made, not naturally occurring.
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24 POINTS AND 5 STARS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Consider the free body diagram. It is a graphic representation of Mike exerting a force on a refrigerator. Four balanced forces are acting on the refrigerator in this case, No matter how hard Mike pushes, he cannot move the refrigerator. Mike asks Bill to help him. Both men push with 2N of force.
If Mike and Bill both push on the refrigerator, all BUT ONE statement would be true.
A. If both men push, they each use about half as much force.
B. Mike is still using the same amount of force he originally used.
C. The force is most likely doubled, while the mass remains the same.
D. Combined, about twice as much force is exerted on the refrigerator.
Answer : A) If both men push, they each use about half as much force.
Explanation : If both men push, they each use about half as much force. Mike needs Bill to increase the force on the refrigerator. Two men equals two times the force. The force of each is not reduced.
Hope this helps you!
Name the physical properties that many ionic compounds share.
which ratio forms a proportion with 16/20? 4/10, 32/50, 8/12, 4/5. PLZ HELP
Answer:
4/5
Explanation:
Answer: 16/20 reduces to 4/5 it is proportional
What can you infer about the volume of an object imagined with a greater mass?
New cells are created from A) matter. B) energy. C) other cells. D) non-living matter.
Answer: C) other cells.
Explanation: I took the Pre-Test on USA Test Prep.