What is the mass of 4.2 x 10^24 molecules of Ca(OH)2
two atoms With diferent mass number but the same atomic number are called
Answer:
they are called isotopes
What is the darkest layer of soil at the top of the photograph called?
A. Aggregate
B. Subsoil
C. Bedrock
D. Topsoil
Answer: D.)Topsoil
Explanation: Have agriculture
NEED HELP HURRY!
Select the correct answer.
Which item is made from a synthetic material?
OA
cotton pants
B.
leather jacket
O C.
tissue paper
D.
wicker basket
Answer:
B: Leather Jacket
Explanation: I hope that this helped :)
Which of the following best describes a person doing science?
o A.
Dominick uses a computer to do his math homework.
O B. Lindsay measures the sizes of the craters on the Moon.
O C.
Isabel invents a new kind of doorknob.
o
D. Murray randomly predicts the result of a coin toss.
Answer:
B. Lindsay measures the sizes of the craters on the moon
Answer:
I think it's D but it's my (viewpoint)
Which substance can be decomposed by chemical means? a. calcium b. argon c. sodium chloride d. aluminum
Explain why energy sources do not have 100% efficiency. Why do you think some have lower efficiencies?
Answer:
Energy sources do not have 100% efficiency because the processes of energy conversion to usable forms involves energy losses.
Some have lower efficiencies due to; energy losses in form of heat during conversion, poor technology applied during conversion of energy and lack of desire equipment to use in the energy conversion system.
Explanation:
The desired form of energy for use is derived from conversion of energy from the source using an energy converter into another form which is usable. The efficiency of the energy converter is calculated as;
л = output energy/input energy
The efficiency of energy is limited to the cost of equipment required for conversion from energy source by the energy converter to a form which is usable. Additionally, because energy sources are scarce, the technology to use in energy conversion is a factor affecting energy efficiency in that high efficiency will require advanced technology with better equipment leading higher costs of that energy form. when heat losses are involved during energy conversion, efficiency lowers, thus its better if such losses are used as energy input in another system.
A student measures the sides of a cube with a ruler and finds that the length of each side is 2.70 cm what is the volume of the cube in centimeter cubed
Answer
V= 19.68cm^3
Explanation:
V=a^3
a=2.70cm
V=2.70cm^3
2.70^3= 19.68
V=19.68cm^3
Answer:
V= 19.68 cm^3
Explanation:
V= a^3
V= 2.70cm^3
V= 19.68cm^3
Muscles, bones, skin, and
organs are all mainly made up of
(PICK
ONE) -> Fats Fiber Minerals | Protein.
Answer:
The answer is Protein.
A student is participating in the school science fair. She wants to investigate household cleaners.
Which question can she best answer through scientific investigation?
A. Which household cleaner is most effective at removing stains?
B. Which household cleaner smells the best?
C. How often should a person use household cleaners?
D. Where should a person buy household cleaners?
Answer:
A
Explanation:
what is the molecular equation to AgNO3 (aq) + H2S(aq)?
There are two forms of chemical equations
Ion equation: written in ion form (as separated ions) which forms the net ionic equation after removing an ion spectator
Molecular equation: written in molecular form
2AgNO₃(aq) + H₂S(aq) ⇒ Ag₂S(s) + 2HNO₃(aq)
The above reaction can be included in a double replacement reaction⇒ an ion exchange between two ion compounds in the reactant to form two new ion compounds in the product
It can be shown the existence of the precipitation reaction, which is the formation of insoluble Ag₂S (not dissolve)
Which system works with the reproductive system? (Hint, its not C)
A. Endocrine system
B. Excretory system
C. Respiratory system
D. Skeletal system
Answer:
A
Explanation:
Option B, Excretory System
What is the chemical formula for the limiting reactant in the reaction shown? Write the balanced chemical equation for the reaction, using lowest whole-number coefficients.
1. What is the chemical formula for the limiting reactant in the reaction shown?
Answer: NO
2. Write the balanced chemical equation for the reaction, using lowest whole-number coefficients.
Answer: 2NO + 2H2 —-> 2H2O + N2
Taking into account the definition of limiting reagent and balanced reaction, you get:
NO is the limiting reagent.The balanced reaction is 2 NO + 2 H₂ → 2 H₂O + 1 N₂What is the chemical formula for the limiting reactant in the reaction shown?The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.
The reagent in excess will be the one that is not completely exhausted during the reaction, that is, they are those that are partially consumed, "excess" amount of that reagent. This is because the amount of product obtained from the reaction will always depend on the amount of limiting reagent in the reaction.
In this case, you can see that you have two reactants: NO and H₂. Having 4 moles of NO and 5 moles of H₂, you can see that no moles of NO are present in the products, but there is 1 mole of H₂.
This indicates that NO is the limiting reagent, since it is completely consumed, while there is 1 mole of H₂ in excess.
In summary, NO is the limiting reagent.
Write the balanced chemical equation for the reaction, using lowest whole-number coefficients.Taking into account that the reagents are in stoichiometric proportions when the reagents are combined with each other without any of them, you can observe that the chemical equation is:
4 NO + 4 H₂ → 4 H₂O + 2 N₂
Dividing by 2 to get the lowest whole-number coefficients, the balanced chemical reaction is:
2 NO + 2 H₂ → 2 H₂O + 1 N₂
Learn more:
https://brainly.com/question/15235721Can someone please help me with this
Answer:
b Mass +1 charge 0
Explanation: protons are neutral, so neutrons do not have charge
Which statement describes the most common ways in which students and professional scientists communicate the
results of their scientific research?
O Students communicate results in oral reports to the class, and professional scientists communicate results in
written reports
Students communicate results in scientific journals, and professional scientists communicate results in laboratory
reports
Students communicate results in laboratory reports, and professional scientists communicate results in scientific
journals
Students communicate results through secondary sources, and professional scientists communicate results
through primary sources.
Answer:
Students communicate results in laboratory reports, and professional scientists communicate results in scientific journals.
Explanation:
This is the answer i just did it.
I hope this helps.
Answer:
Students communicate results in laboratory reports, and professional scientists communicate results in scientific journals.
Explanation:
brainliest please
Is the electron arrangement in a sodium ion
similar to neon or to argon?
Answer:
Just as some elements attain a noble gas configuration by gaining some extra electrons, other elements can more easily gain that configuration by losing some electrons. For a sodium atom, it is simply closer to get to the same configuration as neon than it is to get to the same configuration as argon.
Which statement is true because of Newton's second law?
Group of answer choices
You have to push a full shopping cart with more force than an empty shopping cart.
A soccer ball will not move until someone kicks it.
For every action there is an equal and opposite reaction.
A skateboarder travels at a constant speed when there are balanced forces acting on him.
Answer:
You have to push a shopping cart with more force than an empty shopping cart.
Explanation:
Hope this helps! Plz vote brainliest
Which is a characteristic of calcium?
A.It has two neutrons
B.It has two energy shells
C.It has two protons
D.It has two electrons in its outer energy shell
The spongy layer of leaves stores water and food.
True
False
Answer:
True
Explanation:
The main function of the spongy layer is to temporarily store sugars, and amino acids synthesized in the palisade layer of the leaf (the palisade carries out most of photosynthesis)
Were any scientific investigations conducted for proposing the theory? Was this theory tested or simply expected?
Answer: Yes
Explanation:
Scientific theory can be defined as the solutions to the problems of the queries related to natural phenomena or it is the explanation for different aspects of the natural world. It is done with repeated testing procedure. To prove the facts of the theory, repeated experimental tests, and observations are done. The theories are tested under the controlled conditions of the experimental set up.
On the basis of the above description, we can say that the scientific investigations are done in the form of experimentation trials before proposing a theory. The theory is tested and is not simply expected.
Answer: Yes, Clements compared ecological succession with the development of organisms. Yes, this theory was tested.
Explanation:
How many significant figures are in 20600?
There are 3 significant figures in 20600.
Mr. Stark thinks that a special juice will increase the productivity of workers. He creates two groups of 50 workers each and assigns each group the same task (in this case, they're supposed to staple a set of papers). Group A is given the special juice to drink while they work. Group B is not given the special juice. After an hour, Mr. Stark counts how many stacks of papers each group has made. Group A made 1,587 stacks, Group B made 2,113 stacks.
Identify the independent variable and dependent variable
Identify the control group and experimental group
Explanation:
taking a special juice independent variable
the number of stuck of paper dependent variable
the control group is group B
experimental group is Group A
for more information study on thougtco
what is the equivalent volume occupied by three millimeters of water?
3 kg
3 cg
3 cubic cm
3 cm
also I apologize I am very stupid
Answer:
three cubic centimeters
Explanation:
How do you know which elements increases or which elements decreases on a Ionisation graph? Like how can you figure out that these elements will increase on the graph and which will decrease?
Explanation:
There is a trend in the periodic table.
I.E increases up the group and across the period. So you know that metals have less I.E compared to non-metals.
Which of the following is not a physical property of a rock?
A. luster
B. electrical conductivity
C. melting point
D. density
Answer:
B
Explanation:
electrical conductivity of a rock cannot be determined by merely looking at the rock
Forensic psychiatry focuses on the relationship between human behavior and criminal justice.
O True
O False
what is the reason of the gas pressure.
Answer:
The rapid motion and collisions of molecules with the walls of the container causes pressure (force on a unit area). Pressure is proportional to the number of molecular collisions and the force of the collisions in a particular area. The more collisions of gas molecules with the walls, the higher the pressure
15 Each Points Please Help ASAP!! View Attached Image!! Will Mark Brainliest If All Are Answered!!
Answer:
Questions 1 is Letters
Questions 2 is H I believe
Questions 3 is hardness
Explanation:
hope I helped
Answer:
1. c
2. a
3. b
you're welcome
Predict which surface will melt ice faster. Wood or metal? Why?
Answer:
I believe wood wood melt it faster. Why, because of how compact it is. It would be warmer. Metal would be a cooler temperature.
Explanation:
9. Use dot and cross diagrams to represent the following compounds.
a. Sodium chloride (NaCl)
Answer:
I have attached the diagram
