Answer:
B. a physical change does not change the chemical formula of the substance
Explanation:
Physical change does not change the substance or identity of an object
The correct answer is physical change does not change the chemical formula of the substance.
What is a physical change?A physical change is one in which only the physical state of matter is altered. Its chemical characteristics have not changed. A physical change is usually brought about by increasing the temperature or exerting pressure, or both. The original state of matter is restored by reversing the condition, that is, lowering the temperature, lowering the pressure, or both.Physical changes, in other words, are reversible.Learn more about Physical change here:https://brainly.com/question/25014732
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A 32.5 g sample of metal X require 659 J of energy to heat it from 10°C to 77°C calculate the specific heat capacity of metal X. Round your answer to significant figures.
3.35 J/g °C
0.303 J/g °C
2170 J/g °C
169 J/g °C
Answer:
0.303 J/g°C.
Explanation:
From the question given above, the following data were obtained:
Mass (M) of metal = 32.5 g
Heat (Q) required = 659 J
Initial temperature (T1) = 10 °C
Final temperature (T2) = 77 °C
Specific heat capacity (C) of metal =.?
Next, we shall determine the change in temperature of the metal. This can be obtained as follow:
Initial temperature (T1) = 10 °C
Final temperature (T2) = 77 °C
Change in temperature (ΔT) =.?
Change in temperature (ΔT) = T2 – T1
Change in temperature (ΔT) = 77 – 10
Change in temperature (ΔT) = 67 °C
Finally, we shall determine the specific heat capacity of the metal as follow:
Mass (M) of metal = 32.5 g
Heat (Q) required = 659 J
Change in temperature (ΔT) = 67 °C
Specific heat capacity (C) of metal =.?
Q = MCΔT
659 = 32.5 × C × 67
659 = 2177.5 × C
Divide both side by 2177.5
C = 659/2177.5
C = 0.303 J/g°C
Therefore, the specific heat capacity of the metal is 0.303 J/g°C.
why do scientist study volcanos!!
Answer:
Volcanologists use many different kinds of tools including instruments that detect and record earthquakes (seismometers and seimographs), instruments that measure ground deformation (EDM, Leveling, GPS, tilt), instruments that detect and measure volcanic gases (COSPEC), instruments that determine how much lava is moving underground (VLF, EM-31), video and still cameras, infrared cameras, satellite imagers, webcams, etc!
Explanation:
I HOPE IT HELPED
Answer:
what the other guy said
Explanation:
What is the density in g/cm3 of a rectangular prism whose sides measure 10cm x 1cm x 2 cm and has a mass of 240g?
Answer:
12 g/cm³
Explanation:
From the question given above, the following data were obtained:
Dimension = 10 cm × 1 cm × 2 cm
Mass = 240 g
Density =.?
Next, we shall determine the volume of the rectangular prism. This can be obtained as follow:
Volume = 10 cm × 1 cm × 2 cm
Volume = 20 cm³
Finally, we shall determine the density of the rectangular prism as follow:
Mass = 240 g
Volume = 20 cm³
Density =.?
Density = mass /volume
Density = 240 /20
Density = 12 g/cm³
Therefore, the volume of the rectangular prism is 12 g/cm³.
While Karen was cooking dinner, she noticed that several ingredients went through chemical and physical changes. Which cooking process is an example of a physical change?
A. Boiling soup
B. Frying eggs
C. Baking cookies
D. Toasting bread
Answer: frying egg
Explanation:
What affects the direction of the current
Answer:
direction of the wire moves in and the direction of magnetic field.
How many electrons would Boron with a +2 charge have?
5 electrons
Boron atomic number 5 has five electrons in its ground state.
Commonly Boron will lose 3 electrons leaving 2 electrons in its most common ionic form.
Explanation:
The atomic number gives the number of protons. Protons which have a positive charge are balanced by an equal number of electrons in a neutral atom.
Boron number 5 has five protons and therefore as a neutral atom also has five electrons.
Boron has an electron configuration of
1s22s22p1
The most stable electron configuration for Boron is
1s2
+ 3 charges. By losing three electrons Boron can achieve the stable electron structure of Helium
Brainliest? :D
explain the parts of a cell.
Answer:
Nucleus
The nucleus can be thought of as the cell’s headquarters. There is normally one nucleus per cell, but this is not always the case, skeletal muscle cells, for instance, have two. The nucleus contains the majority of the cell’s DNA (a small amount is housed in the mitochondria, see below). The nucleus sends out messages to tell the cell to grow, divide, or die.
Plasma membrane
To ensure each cell remains separate from its neighbor, it is enveloped in a special membrane known as the plasma membrane. This membrane is predominantly made of phospholipids, which prevent water-based substances from entering the cell. The plasma membrane contains a range of receptors, which carry out a number of tasks, including being:
Gatekeepers: Some receptors allow certain molecules through and stop others.
Markers: These receptors act as name badges, informing the immune system that they are part of the organism and not a foreign invader.
Communicators: Some receptors help the cell communicate with other cells and the environment.
Fasteners: Some receptors help bind the cell to its neighbors.
Cytoplasm
The cytoplasm is the interior of the cell that surrounds the nucleus and is around 80 percent water; it includes the organelles and a jelly-like fluid called the cytosol. Many of the important reactions that take place in the cell occur in the cytoplasm.
Lysosomes and peroxisomes
Both lysosomes and peroxisomes are essentially bags of enzymes. Lysosomes contain enzymes that break down large molecules, including old parts of the cells and foreign material. Peroxisomes contain enzymes that destroy toxic materials, including peroxide.
Cytoskeleton
The cytoskeleton can be considered the scaffolding of the cell. It helps it maintain the correct shape. However, unlike regular scaffolding, the cytoskeleton is flexible; it plays a role in cell division and cell motility — the ability of some cells to move, such as sperm cells, for instance.
The cytoskeleton also helps in cell signaling through its involvement in the uptake of material from outside the cell (endocytosis) and is involved in moving materials around within the cell.
Endoplasmic reticulum
The endoplasmic reticulum (ER) processes molecules within the cell and helps transport them to their final destinations. In particular, it synthesizes, folds, modifies, and transports proteins.
The ER is made up of elongated sacs, called cisternae, held together by the cytoskeleton. There are two types: rough ER and smooth ER.
Golgi apparatus
Once molecules have been processed by the ER, they travel to the Golgi apparatus. The Golgi apparatus is sometimes considered the post office of the cell, where items are packaged and labeled. Once materials leave, they may be used within the cell or taken outside of the cell for use elsewhere.
Mitochondria
Often referred to as the powerhouse of the cell, mitochondria help turn energy from the food that we eat into energy that the cell can use — adenosine triphosphate (ATP). However, mitochondria have a number of other jobs, including calcium storage and a role in cell death (apoptosis).
Ribosomes
In the nucleus, DNA is transcribed into RNA (ribonucleic acid), a molecule similar to DNA, which carries the same message. Ribosomes read the RNA and translate it into protein by sticking together amino acids in the order defined by the RNA.
Are the effects of adding heat reversible
Answer:
yes they are
Explanation:
if you are heating up glass i believe not, unless you want to break the glass. Making glass go from high to low or low to high tempuatures quickly will cause it to break. How ever metal will be stronger as long as you dont bend it.
In n=6 the correct sequence for filling of electron will be
Answer:
If n=6, the correct sequence for filling of electrons will be ns→(n−2)f→(n−1)d→np
use dimensional analysis to slove; a reasearcher is given 1.5 dry oz of a substance which he needs to evenly distribute over 10 vials. how many micrograms schools each vial contain? show all work.
Answer:
4.25248 x [tex]10^{6}[/tex] μg per vial
Explanation:
Conversion Factors
28.3495231 g = 1 dry oz
[tex]10^{6}[/tex] μg (micrograms) = 1 g
[(1.5 dry oz) x (28.3495231 g / 1 dry oz) x ([tex]10^{6}[/tex] μg / 1 g)] / 10 vials = 4,252,428.465 μg / vial
How long will it take a piece of strontium-90 (produced in a nuclear test blast) weighing exactly 1000.0 g to be
reduced to 15.625 g? The half-life of strontium 90 is 28.8 years,
Answer:
Time taken 172.8 years
Explanation:
Given data:
Total amount of strontium-90 = 1000.0 g
Amount left = 15.625 g
Half life of strontium = 28.8 years
Time taken = ?
Solution:
Number of half lives:
At time zero = 1000.0 g
At first half life = 1000.0g/2 = 500 g
At second half life = 500 g/2 = 250 g
At third half life = 250 g/ 2 = 125 g
At 4th half life = 125 g/ 2= 62.5 g
At 5th half life = 62.5 g/2 = 31.25 g
At 6th half life = 31.25 g / 2 = 15.625 g
Time taken:
Time taken = number of half lives × half life
Time taken = 6×28.8 years
Time taken = 172.8 years
How are electrons arranged around the nucleus of an atom
Answer: electrons are arranged in shells around an atom's nucleus.
Explanation:
Changing a solid to a liquid to a gas is changing the
matter.
*
Your answer
Answer:
i could help you can you explain more plzzzzzz i really need points
Explanation:
Answer:
It is changing the state of matter.
This HAS to be an answer for second graders
Where do different kinds of apples come from?
is mineral oil ionic or covalent
Answer:
Iconic
Explanation:
hope this helps :) x
can protons neutrons and electrons be found on the ptoe?
An igneous rock has a coarse texture and is dark in color. How else can this rock be accurately described?
small crystals
cooled quickly
produced from magma
formed at Earth’s surface
Answer:
B- cooled quickly
Explanation:
credit to the person above me :)
An igneous rock has a coarse texture and is dark in color. The rock can be accurately described as cooled quickly.
What are rock?Rock are defined as a natural substance made up of crystalline crystals of various minerals fused together to form a solid mass.
It is also defined as any naturally occurring mineraloid substance or solid bulk.
There are basically three types of rock.
Igneous rock - It is defined as rocks arise from magma, a molten mixture of rock-forming minerals and frequently volatiles such as gases and steam. Metamorphic rock - It is defined as those created by modifications in preexisting rocks caused by high temperature, pressure, and chemically active fluids.Sedimentary rock - It is defined as a materials deposited and lithified near the Earth's surface by rushing water, wind, ice, or living creatures.Thus, an igneous rock has a coarse texture and is dark in color. The rock can be accurately described as cooled quickly.
To learn more about rock, refer to the link below:
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Please help with my chemistry homework
Answer:
amu, atomic number, electrons, atomic mass
Explanation:
When we convert one metric unit to another the conversion factor is always exactly equal to 1. true or false
Answer:
The answer is True.
Explanation:
You can use similar processes when converting from smaller to larger units. When converting a larger unit to a smaller one, you multiply; when you convert a smaller unit to a larger one, you divide.
M= 25.4 g
V= 12.2 mL
D=
Answer:
Explanation:
density = m/v
answer = 2.0819 g/ml
rounded (correct sig figs) = 2.08
Answer:
About 2.08 g/mL
Explanation:
25.4g ÷ 12.2 mL = 2.0819..... g/mL
About 2.08 g/mL
Two pieces of the same metal or placed on the table with the piece of metal have the same density mass and texture which characteristic must be the only difference between the two samples
A-they contain a different amount of matter per unit volume
B-they have different dimensions
C-they are made up of a different type of matter
D-they have different boiling points
Answer:
B-they have different dimensions
Explanation:
It was explicitly stated in the question that the both samples are exactly pieces of the same metal. If that is so, pieces of the same metal must have the same density, contain the same quantity of matter, have the same boiling point and have the same amount of matter per unit volume.
However, the two pieces of metal may have different dimensions.
The energy of the motion of the particles in the matter
2 points
Heat
Potential Energy
Thermal Energy
Total Internal Energy
Kinetic energy
How do you write the electron notation and orbital fill notation for calcium?
The simple unit of a compound
Answer:
the basic unit of an ionic compound is called a formula unit and the basic unit of a covalent compound is a molecule.
A student estimates that 27 students will attend this month's
Science Club meeting 34 students attend. What was the
student's percent error?
Answer:
I think 20.58 so 21%?
Explanation:
4. How many grams would 2.5 moles of magnesium
(Mg) weigh?
Answer:u would have 30 grams in it
Explanation:cause u have 12 grams in each mole
why don't the praticles in a solid move past one another
Answer:
Particles in a solid object are super tight and close to eachother. They do not move past eachother because it is a solid, not a liquid or gas.
Explanation:
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.
mark me as brainliest
Question in picture below
Answer:
Models 1 and 2 would be in the same group.
Explanation:
They have the same amount of valence electrons. Valence electrons are electrons in the outermost electron cloud. This means they have the same properties, therefore are in the same Group on the periodic table.
The Hot-Wheel car was accelerating across the table at 0.25 meters per second squared (m/s^2) from an applied force of 10 N. What is the mass of the Hot Wheel car? *
40 grams
2.5 grams
0.025 grams
cannot be determined
Answer:
Explanation:
Consider the motion of a Hot Wheels car beginning from rest at an elevated position. The Hot Wheels car rolls down a hill and begins its motion across a level surface. Along the level surface, the Hot Wheels car collides with a box and skids to a stop over a given distance. How could work and energy be utilized to analyze the motion of the Hot Wheels car? Would the total mechanical energy of the Hot Wheels car be altered in the process of rolling down the incline or in the process of skidding to a stop? Or would the total mechanical energy of the Hot Wheels car merely be conserved during the entire motion?
Of course the answers to these questions begin by determining whether or not external forces are doing work upon the car. If external forces do work upon the car, the total mechanical energy of the car is not conserved; the initial amount of mechanical energy is not the same as the final amount of mechanical energy. On the other hand, if external forces do not do work upon the car, then the total mechanical energy is conserved; that is, mechanical energy is merely transformed from the form of potential energy to the form of kinetic energy while the total amount of the two forms remains unchanged.
While the Hot Wheels car moves along the incline, external forces do not do work upon it. This assumes that dissipative forces such as air resistance have a negligible affect on the car's motion. This is a reasonable assumption for the low speeds of the car and its streamline characteristics. Since external forces do not do work on the car, the total mechanical energy of the car is conserved while moving along the incline. As the work-energy bar charts in the animation below depict, energy is transformed from potential energy (the stored energy of position) to kinetic energy (the energy of motion). The car gains speed as it loses height. The bar chart also depicts the fact that the total amount of mechanical energy is always the same; when the two forms are added together, the sum is unchanging.
When the Hot Wheels car collides with the box and skids to a stop, external forces do a significant amount of work upon the car. The force of friction acts in the direction opposite the car's motion and thus does negative work upon the car. This negative works contributes to a loss in mechanical energy of the car. In fact, if 0.40 Joules of mechanical energy are lost, then -0.40 Joules of work are done upon the car. As this work is done, the mechanical energy of the car (in the form of kinetic energy) is transformed into non-mechanical forms of energy such as sound and heat.
The standard unit of radiation related to biologic hazard is known as the .
Answer:
the standard unit of radiation related to biological hazards is known as the Roentgen.
Explanation:
