Answer:
brittle is not a characteristic of medals.
Terry bought a gold necklace at a pawnshop and was wondering if it was “real” gold. She decided to perform a density test. She placed the necklace in a graduated cylinder of water that had 47.00 mL of water and the water rose to 48.35 mL. She then weighed the necklace and found it to have a mass of 22.89 g. What is the density of Terry’s necklace?
Answer:
d = 16.96 g/mL
Explanation:
Given that,
Initial water level in graduated cylinder is 47 mL and final water level is 48.35 mL.
The weight of the neclace is 22.89 g.\
We need to find the volume of the necklace. We know that, density equals mass per unit volume. So,
[tex]d=\dfrac{m}{V_f-V_i}\\\\d=\dfrac{22.89\ g}{(48.35-47)\ mL}\\\\d=16.96\ g/mL[/tex]'
Hence, the density of Terry’s necklace is 16.96 g/mL.
Answer:
A
Explanation:
The new mine means the supply is high and the price is low, so she can afford the necklace
Questions
1 Describe two ways in which sodium chloride is different from sodium
frorent from chlorine
chlorine
The compound composed of these ions exhibits properties entirely different from the properties of the elements sodium and chlorine. Chlorine is poisonous, but sodium chloride is essential to life; sodium atoms react vigorously with water, but sodium chloride simply dissolves in water.
What is the total number of protons, neutrons, and electrons in a thallium, TI, atom that has a mass number of 204
Help
Answer:
Name, Thallium. Symbol, Tl. Atomic Number, 81. Atomic Mass, 204.3833 atomic mass units. Number of Protons, 81. Number of Neutrons, 123. Number of Electrons, 81 ... It has a metallic luster when it is first exposed to air but it tarnish quickly
Explanation:
Hope this helped :)
Which of these is a property of a substance that is composed of atoms that are held together by metallic bonds?
It has a low melting point.
It can be flattened and bent.
It cannot be shaped into wires.
It does not conduct electricity.
Answer:
B: it can be flattened and bent
Explanation:
Metals are malleable and can be flattened. Metals are ductile and can be deformed and bent.
Metals are bonded together by metallic bonds.
Hence a substance that is composed of atoms that are held together by metallic bonds can be flattened and bent.
The property of a substance that is composed of atoms that are held together by metallic bonds is it can be flattened and bent
What is metallic bond ?Metals are malleable, ductile substance can be deformed when it is bent down, theses are bonded by metallic bond and can be flattened.
The metallic bond is a force of attraction which is responsible for holding the atoms together, releases electrons to achieve the configuration of a noble gas.
in this type of bonding all the atoms lose their electrons from their outermost layers that move more or less freely between them, forming an electronic cloud
The metallic bond is the exceptional bond where the electrons are not present exclusively between a pair of atoms, but these are relocated among millions of them called as "sea of electrons" by cohesive bond.
For more details regarding metallic bond, visit
https://brainly.com/question/12443186
#SPJ6
is this enough money for this question
A certain type of frog reproduces sexually and has 36 pairs of chromosomes in each of its body cells. How many chromosomes are in each of the frog’s sex cells?
Answer:
The answer is 36 on edgenuity.
what does the chemical formula Ba(HCO3)2 tell us about number of atoms of each element present
Answer: The chemical formula is Ch(HCO3)2 and Cn(HO3)2
Explanation:
There is 1 atom of Ba, 2 atoms of hydrogen, 2 atoms of carbon, and 6 atoms of oxygen.
What are molecules?The smallest particle of a substance has all of the physical and chemical properties of that substance.
The chemical formula Ba(HCO3)2 tells us about the number of atoms of each element present as follows:
1 atom of Ba
2 atoms of hydrogen
2 atoms of carbon
6 atoms of oxygen.
Learn more about molecules here:
brainly.com/question/14130817
#SPJ2
C. A paramecium is a single-celled organism that lives in ponds. It travels at a rate of 2,000 micrometers per second. What is the speed of the paramecium in meters per hour?
Answer:
7.2 meters per hour
Explanation:
It is given that,
The speed of a paramecium is 2,000 micrometers per second.
We need to find the speed of the paramecium in meters per hour.
We know that,
[tex]1\ \mu m=10^{-6}\ m[/tex]
and
1 hour = 3600 seconds
[tex]v=2000\ \dfrac{\mu m}{s}\\\\=2000\times \dfrac{10^{-6}\ m}{(\dfrac{1}{3600})\ s}\\\\=7.2\ \text{meters/hour}[/tex]
Hence, the speed of the paramecium is 7.2 meters per hour.
A Potassium isotope contains 19 protons, 19 electrons and 21 neutrons. What is its mass number? 40
Answer:
17
Explanation:
you add 19+19 the subtract 21. I think
A potassium isotope contains 19 protons, 19 electrons, and 21 neutrons, so the mass number is 40 as the mass number of the atom is the sum of the protons and the neutrons, the mass number is 40.
What is the significance of the mass number in the atom?The mass number is significant as it is the sum of the number of protons and neutrons present in nucleus of an atom, which determines the atomic weight of an element and also determines its chemical properties and its position on the periodic table. Isotopes of an element have the same atomic number but a different mass number, so they have different properties than the original element.
Hence, a potassium isotope contains 19 protons, 19 electrons, and 21 neutrons, so the mass number is 40 as the mass number of the atom is the sum of the protons and the neutrons, the mass number is 40.
Learn more about the mass number in the atom here.
https://brainly.com/question/4408975
#SPJ2
How many penicillin molecules would you have if you had a total of 36 hydrogen atoms? What would be the total atomic mass?
Answer:
Explanation:
Molecular formula of penicillin = C₁₆ H₁₈ N₂ O₄S
No of hygrogen atoms = 36
No of molecules = 36 / 18 = 2
molecular weight = 334 amu
molecular weight of 2 molecules = 334 x 2 = 668 amu.
Claudia performed a flame test in her lab. The result of her flame test is shown here.
Answer:
Where is the results and what is the question or is there a picture
Explanation:
Which of these elements in GroupA on the periodic table has the largest atomic radius?
A.Cesium
B.Rubidium
C.Potassium
D.Sodium
Answer:
A i think is the answer
Which of the following most likely explains why the chemical symbol for calcium is Ca?
A. The symbol C was already used for carbon.
B. The symbol was assigned by modern alchemists.
C. Calcium is made of more than one type of atom.
Answer:
it is a latin word, so B
Explanation:
(1 kilometer = 1,000 meters, 1 hour = 60 minutes, 1 minute = 60 seconds) Complete the steps necessary to convert 55 kilometers per hour to meters per second. Min 60 1,000 15.28 100 sec
Explanation:
55 kilometers per hour to meters per second
First we have to convert the kilometers to grams;
1 kilometer = 1,000 meters
This means we have;
55000 meters per hour
Converting hour to seconds;
1 hour = 60 minutes
1 minute = 60 seconds
1 hour = 60 * 60 = 3600 seconds
We divide 55000 by 3600;
55000 / 3600 = 15.28 meters per second
Explanation:
55 kilometers per hour to meters per second
First we have to convert the kilometers to grams;
1 kilometer = 1,000 meters
This means we have;
55000 meters per hour
Converting hour to seconds;
1 hour = 60 minutes
1 minute = 60 seconds
1 hour = 60 * 60 = 3600 seconds
We divide 55000 by 3600;
55000 / 3600 = 15.28 meters per second
Which characteristic best explains why gases are more compressible than liquids or solids?
A Gas particles tend to attract one other, while liquid and solid particles tend to repel each other.
B. Gas particles tend to be separated by larger distances than liquid or solid particles are.
C Gas particles tend to move more rapidly than liquid or solid particles do.
D. Gas particles tend to clump together as their temperatures increase
Answer:B
Explanation:
Answer:This chapter begins the first where we will look at matter on a microscopic scale. Matter is made of small particles of atoms or molecules. There are three common states of matter, solid, liquid and gas. A gas and a liquid will change shape to fit the shape of their container. A gas will change volume to fit the volume of the container.
Explanation:
In general, solids are denser than liquids, which are denser than gases. . The particles in the solid are touching with very little space between them. The particles in a liquid usually are still touching but there are some spaces between them. The gas particles have big distances between them.
Solid – In a solid, the attractive forces keep the particles together tightly enough so that the particles do not move past each other. Their vibration is related to their kinetic energy. In the solid the particles vibrate in place.
Liquid – In a liquid, particles will flow or glide over one another, but stay toward the bottom of the container. The attractive forces between particles are strong enough to hold a specific volume but not strong enough to keep the molecules sliding over each other.
Gas – In a gas, particles are in continual straight-line motion. The kinetic energy of the molecule is greater than the attractive force between them, thus they are much farther apart and move freely of each other. In most cases, there are essentially no attractive forces between particles. This means that a gas has nothing to hold a specific shape or volume.
(A fourth state of matter, called plasma, exists when a gas becomes ionized. Plasma exists inside stars and in interstellar gases.)
What is absolute zero? A) The temperature at which the particles of matter are at their lowest energy points. B) The temperature at which the particles of matter are at their highest energy points. C) Other _______________
Answer:
A) The temperature at which the particles of matter are at their lowest energy points.
Explanation:
Absolute temperature refers to the lowest possible temperature. At this state, no heat energy remains in the substance; the energy of the particles are at their lowest energy points.
difference between compound and element
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
What is the mass of a liquid having a
density of 1.40 g/mL and a volume of
3090 mL?
Answer:
It has a mass of 4.326 grams.
Explanation:
Which of the following did federalists oppose?
Answer:
The Federalists felt that this addition wasn't necessary, because they believed that the Constitution as it stood only limited the government not the people
solve find the value of x
Answer:
50
Explanation:
2x+5=105
2x=100
2x/2=100/2
x=50
In which Group do most of the elements have 8 valence electrons?
A. Transition metals
B. Alkaline earth metals
C. Halogens
D. Noble gases
HELP PLZ !!!!! !!!!
Which of these is a sedimentary rock?
A) Granite
B) Obsidian
C )Quartzite
D) Sandstone
Answer:
D
Explanation:
In chemistry she wants to know why to certain items or people shock me?
Anybody know about this chem problem, please anything helps.
Answer:
B
Explanation:
the second option is right
a cheetah can run 112km/h over a 100-m distance. what is this speed in meters per second
The cell organelles that contains chlorophyll
Answer:
In plants, photosynthesis takes place in chloroplasts, which contain the chlorophyll. Chloroplasts are surrounded by a double membrane and contain a third inner membrane, called the thylakoid membrane, that forms long folds within the organelle.What are five ways to identify a chemical reaction
Answer:
A chemical reaction occurs when a substance is rearranged to form a new substance. It is possible to identify if this has taken place from one of the five signs of chemical change. These changes include color change, temperature change, precipitate formation, gas production and light emission.
Explanation:
hope it helps :))
Answer:
A chemical reaction occurs when a substance is rearranged to form a new substance. It is possible to identify if this has taken place from one of the five signs of chemical change. These changes include color change, temperature change, precipitate formation, gas production and light emission.
hope it helps :)
measure the mass of 1 gram of sand
Answer:
Mass: 1 gram
Explanation:
This question doesn't make sense because the mass would be 1 gram.
Grams are a unit of mass.
The modern atomic theory has been updated over the years as new observations of the atom have been made. What do these changes say about the strength of the modern atomic theory
Answer:
The answer is "It updates reinforce the idea, because it has been checked and modified several times, making it longer lasting".
Explanation:
The description of its empirical data throughout the world is a scientific principle. It's also based on facts and is often extensively tested by researchers. Repetitive done by scientists testing helps to enhance its body of knowledge. As just a result of advances in technology, after observation, data collection, and findings evaluation, scientific facts are checked, modified, and verified.
How should the baking of a pizza be categorized? A) as an exothermic process because the dough releases heat B) as an endothermic process because the dough releases heat C) as an exothermic process because the dough absorbs heat D) as an endothermic process because the dough absorbs heat
Answer:
D
Explanation:
as an endothermic process because the dough absorbs heat
The baking of a pizza be categorized as an endothermic process because the dough absorbs heat.
What is an Endothermic reaction?This is the type pf reaction in which heat is absorbed from the surroundings in a reaction.
During baking, the oven which is the surrounding is usually hot which brings about the dough absorbing the heat. This depicts an endothermic process and makes option D the most appropriate choice.
Read more about Endothermic reaction here https://brainly.com/question/6506846
The total number of protons and neutrons in an atom is its ___________________.
Answer:
nuggets
Explanation:
tazte very good
Answer:
It's atomic number is 2 so it has 2 protons. It's nucleus also contains 2 neutronns so 2+2=4 the answer is 4 in total.
Explanation:
I think. hehe I hope this helps though.