Answer:
An element is a material that consists of a single type of atom. Each atom type contains the same number of protons. Chemical bonds link elements together to form more complex molecules called compounds. A compound consists of two or more types of elements held together by covalent or ionic bonds.
Explanation:
I hope it helped you
Mass = 35g Volume = 7cm³ What is the Density?
Answer:
The answer is
5.0 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question
mass = 35 g
volume = 7 cm³
The density is
[tex]density = \frac{35}{7} \\ [/tex]
We have the final answer as
5.0 g/cm³Hope this helps you
A cylinder with 10 mL of coconut oil has a mass of 9.3 g. What is the density of the oil? Round to the nearest hundredth.
Answer:
0.93 grams per milliliter
Explanation:
Density is the division of mass by volume. It is how "hefty" an object is; for example, wood isn't very "hefty" but metal is. The density is measured in mass over volume, so it is 9.3/10. After applying units, it is 0.93 grams per milliliter.
A length of wood has a labeled length value of 2.50 meters. You measure its length three times. Each time you get the same value: 2.35 meters. What is the percent error of your measurements? *
Answer:
6%
Explanation:
Actual length of the wood is 2.5 m
Observed length of the wood is 2.35 m
We need to find the percent error of your measurements. The formula of the percentage error is given by :
[tex]\%=\dfrac{|\text{observed-actual}|}{\text{actual}}\times 100\\\\\%=\dfrac{2.5-2.35}{2.5}\times 100\\\\\%=6\%[/tex]
Hence, the percentage error is 6%.
The table shows four samples of carbon dioxide and the temperature of the water that they were dissolved in. Which of the samples most likely had the lowest solubility? I know the answer is sample one (78) but i can't find the right words to explain my answer.
Answer:
Sample 1 = 78°
Explanation:
As per the question, while testing the solubility of a solution comprising of water and carbon dioxide, sample 1 is likely to have the lowest solubility with the temperature of the water being 78°, the maximum. The reason for this result is that the 'solubility of carbon dioxide in the water' falls with an increase in the temperature due to the increase in kinetic energy which will enhance the motion between the molecules and allow them to escape.' Thus, the water with maximum temperature will have the lowest solubility. Hence, sample 1 is the correct answer.
Explain why the design of the bird's nest in the picture provides good insulation for the eggs.
Answer:
First, the lining may consist of loose, smaller bits of the same materials that have been incorporated into the latticework of the nest. These finer materials are utilized to shed water, deter pests, conceal the eggs from predators, insulate, and cushion them. ... They also serve to insulate and cushion the eggs.
Explanation:
6.Think about where you live now or where you have lived in the past; use complete sentences to describe this environment and the weather. What building materials do you believe would work well to build a home in that area? Explain why you chose these materials.
Answer and Explanation:
I have always lived in the same region. The region where I live is flat and stable, the site has asphalt and the climate is tropical with a long summer and poorly defined seasons. My region does not have drastic changes and temperature and the climate is hot most of the year. For this reason, it is necessary to use materials that are thermal insulators, on the contrary we need to use materials that are not good thermal insulators such as concrete blocks, bricks, cement and ceramics, we will also need common tiles and rafters to support them.
how to calculate molecular mass?
Will give Brainlest for correct answers
How is kinetic energy affected by temperature
Answer:
Temperature affects the kinetic energy in a gas the most, followed by a comparable liquid, and then a comparable solid. The higher the temperature, the higher the average kinetic energy, but the magnitude of this difference depends on the amount of motion intrinsically present within these phases
Explanation:
I just know lol
If one end of an iron bar is heated, what causes thermal energy to transfer to the other end? a radiation b conduction c heat of fusion d convection
Answer:
Option B:
Conduction
Explanation:
Conduction is the transfer of heat from one molecule to another between two solids that are in direct contact with each other. For the conduction of heat to occur, the medium involved must be solid. This is because the molecules of solids are closely packed together and they cannot freely move about. The heat flowing through them can easily be passed on from one molecule to the other until it reaches all the parts of the object. This is exactly what will happen to the iron bar. Thermal energy from one end of the bar will get transferred between the molecules of the iron bar until it reaches the other end.
Convection on the other hand involves the transfer of heat through a liquid medium.
Radiation involves teh transfer of heat in a vacuum.
Answer:
b) conduction
Explanation:
Define and give 3 examples of psychical properties
Answer:
A physical property is any property that is measurable, whose value describes a state of a physical system.
Explanation:
-color
-density
-volume
PSYCHOLOGY All of the following physical reactions occur when our fight-or-flight response is triggered except __________. A. dilating pupils B. increasing heartbeat C. increasing digestion D. increasing perspiration
Answer:
C.) increasing digestion
Explanation:
hope this helps:)
Answer:
C. increasing digestion
Explanation:
Which of these elements have just one valence electron?
Answer:
Only Hydrogen and Group 1 elements have 1 valence electron
Explanation:
the valence number of electrons is the group number in the periodic table. So, the group 1 atoms( along with hydrogen) have 1 outer-shell electrons [valence electrons]
The head of a pin is 1.5 × 10-3 m in diameter. If 1.136 × 107 atoms of oxygen can fit across the head of a pin, what is the atomic radius of oxygen?
About five million million hydrogen atoms could fit. Some factors would affect that number like the area of the head and the size of atoms (as well as attractions between atoms). Some atoms are larger than others.
If 1.136 × 10⁷ atoms of oxygen can fit across the head of a pin whose diameter is 1.5 × 10⁻³ m, the atomic radius of oxygen would be 6.60 × 10⁻¹¹ m.
The head of a pin is 1.5 × 10⁻³ m in diameter. If 1.136 × 10⁷ atoms of oxygen can fit across the head of a pin, the diameter of each oxygen atom would be:
[tex]\frac{1.5 \times 10^{-3}m }{1.136 \times 10^{7}atom} = 1.32 \times 10^{-10}m/atom[/tex]
The atomic radius of oxygen would be half of its diameter.
[tex]\frac{1.32 \times 10^{-10} m}{2} = 6.60 \times 10^{-11} m[/tex]
If 1.136 × 10⁷ atoms of oxygen can fit across the head of a pin whose diameter is 1.5 × 10⁻³ m, the atomic radius of oxygen would be 6.60 × 10⁻¹¹ m.
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what number and types of atoms occur in a formula unit of CaN2O6
Answer:
One calcium, two nitrogen, and six oxygen
Explanation:
rabbit is one of the sweetest animal on world ....change it into positive degree
Answer:
rabbit is one of the sweet animal
in the world
What is the difference between the dependent variable and the independent variable in an experiment?
An independent variable is the cause. Its value is independent of other variables in your study. A dependent variable is the effect. Its value depends on changes in the independent variable
Explanation:Variables are the factors or the numbers used as a quantity. The dependent variables are conditional, and the independent variable is the cause that affects the result.
What are dependent variables and independent variables?The independent variable of an experiment is the data that is the cause of the experimental design. Its value and result do not depend on other factors and conditions. These values are manipulative and are set by the researcher.
The dependent variables, on the other hand, vary based on the other factors and variables and are the effect that is based on the response and the outcome of the other variables. It is the tested or the measured value.
Therefore, the independent and dependent variables differ based on cause and effect.
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Express a mass of 0.056 mg in grams.
Answer in units of g.
Answer:
0.000056g
Explanation:
1 mg = 0.001 g
Or if it helps move your decimal sign over left 3 places.
The teacher was not in the room yet. Randy began opening containers of chemicals, touching them with his hands. His cheek itches so he rubbed it. Explain how Randy was not acting safety in the the laboratory.
I know the answer I just don’t know how to word it. Please help. Due by 11:59 tonight
Answer:
Randy went into the classroom without the teacher being present. He opened containers of chemicals without the teacher's consent. Randy is making contact with the chemicals on his skin.
I hope this helps! I haven't done lab science in a while so I'm trying to remember the safety precautions.
Randy went into the classroom without the teacher being present and opened containers of chemical, making contact with chemicals on skin leads to skin reaction.
So Randy should follow the lab safety rules while entering into lab.
What are the important lab safety rules?After entering lab wear apron and gloves along with safety goggles if working with any hazardous or infectious substance.
Fully aware about the hazards of the materials, properly trained to handle lab equipment, chemicals should be adequately labelled.
Taste or smell chemicals are prohibited, never pour already stored chemicals, chemical hygiene plan should be developed for specific hazards.
Avoid to adopt un-tested and unauthorized experimentation, Clean up all chemical spill, Laboratory induction should be carried out .
Avoid storage of any edible items in the refrigerator along with lab chemicals and specimens, clean the work station after completing experiment and sterilization should be done before starting experiment.
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Which statement accurately describes the chemical symbol of an element?
O The chemical symbol is always a single letter.
O The chemical symbol always starts with the same letter as the name of the element.
O The chemical symbol always begins with a capital letter.
OThe chemical symbol can be shared by more than one element.
Answer:
The chemical symbol always begins with a capital letter.
Explanation:
Answer:
c
Explanation:
The chemical symbol of an element always starts with an chemical letter so here the answer is that the chemical symbol always begins with a capital letter.
It can be seen in the different elements chemical symbol .
For example, Tin is having chemical symbol as Sn while lead is having chemical symbol as Pb.
In both these elements, the chemical symbol starts with a capital letter but none of these have their symbol starts with same letter as their name.
What is the force of gravity acting on an object? (3 points)
Velocity
Mass
Weight
Pounds
the answer of these question is weight
how can an item with a lower mass have a higher weight than an item with a higher mass?
Answer:
probs has to do with the size of the object
Explanation:
Please help me with this question.
Answer:
12?
Explanation:
Answer:
8
Explanation:
haploid is half
Is this statement true or false? Why?
Chemical reactions are nothing more than rearrangements of protons.
Answer:
False. Answer in pic above
In fact protons have no role in chemical reactions. The regrouping of atoms itself forms the new products in chemical reactions. The reactions involves the loss/gain or sharing of electrons.
What is a chemical reaction ?A chemical reaction is a chemical change in which two or more atoms combine together to form a new product or a compound decomposes to form its constituent compounds. This involves breaking or making of bonds.
In a chemical reaction, no change occurs in the nuclear composition but the valence electrons are involved in the reaction. Atoms loss or gain electrons or share valence electrons with other atoms to form ne compounds.
The electrostatic force of attraction or the overlapping of atomic orbitals make the new products in a chemical reaction. Hence, the statement is false.
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What is the electron configuration for an atom of tin in the ground state?
Answer:
The ground state electron configuration of ground state gaseous neutral tin is [Kr]. 4d10. 5s2. 5p2 and the term symbol is 3P0.
1)petroleum and natural gas are formed in the__________
2)_______ refers to the things that exists freely in nature or human use
3) during the ____ period the earth was covered with swampy forest's
4)-------- is the mixture of hydrogen, methane, carbon monoxide, and other gases
5)natural gas mainly consists of_____
6)_____are the chemicals derived from petroleum and natural gas
7) the process of refining of petroleum is carried out in refineries and is called _____
8) _____ is used to generate power and to manufacture other fuels like coke and coal tar
Convert 35 mL to cm3. 1 mL = 1 cm3
1. How many molecules are in 2.40 moles of H2O?
Answer:
There arr 1.5*1024 molecules in 2.40 moles of H2O.
is nonflammable a physical or chemical property
How many electrons does the Ca^2+ ion possess
Answer:
18 electrons
Explanation:
Answer:
18 electrons
Explanation:
Ca has 20 electrons. Ca^2+ has 18 electrons
3
Write the alpha decay WITH gamma emission for the following element:
92
AL
27
Answer:
Explanation:
In alpha decay alpha ray comes out . Apha ray is nothing but nucleus of helium atom whose atomic no is 2 and atomic weight is 4 . Hence in alpha decay , atomic weight reduces by 4 and atomic no reduces by 2. For gamma emission , there is no change in atomic number and atomic mass.
⁹²₂₇AL ⇒ ⁸⁸₂₅X + ⁴₂He + γ
X is Manganese .