Answer:
I feel stupid saying this but a spring??
Explanation:
Sorry it was only a guess
A chemical formula is provided. How many atoms of hydrogen (H) are found in this substance?
(NH4)2CO3
Group of answer choices
A.2
B.4
C.6
D.8
Answer:A
Explanation:
The chemical formula depicts the atoms of the elements involved in the substance. In the given substance, ammonium carbonate ((NH₄)₂CO₃), there are 8 hydrogen atoms. Thus, option D is correct.
What is the chemical formula?The chemical formula has been the representation of the elements involved in the chemical reaction with their relative proportions and symbols. It uses subscript to show the number of atoms involved along with the coefficients.
In a chemical compound like ammonium carbonate, there are various elemental atoms involved like nitrogen, hydrogen, carbon, and oxygen. There are two nitrogen, eight hydrogens (4 × 2), one carbon, and three oxygen atoms involved.
Therefore, in option D. there are eight hydrogen atoms in ammonium carbonate.
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5.lodine shine like metal but is not a metal, what are the basis of this
statement?
Answer:
iodine is shining non metal
Explanation:
because as it is a metalloid .(shows partially metal and non metal),it shows lustor property of metal.
Which option is an example of a physical property?
A toxicity
B rusting ability
C melting point
D flammability
Answer:
C . Melting point
Explanation:
Examples of physical properties are: color, smell, freezing point, boiling point, melting point, infra-red spectrum, attraction (paramagnetic) or repulsion (diamagnetic) to magnets, opacity, viscosity and density
Skepticism is important in this scenario because it would help him to learn from the investigations of his colleagues. Ask future questions related to the investigation. Communicate his results at a conference. Ensure that his conclusion is supported by evidence.
Answer:
hello your question is incomplete below is the missing part of the question
A biochemist performs an experiment to study the behavior of water molecules near proteins. He concludes that water molecules occur in groups of five in the presence of proteins.
answer : Ensure that his conclusion is supported by evidence.
Explanation:
Skepticism during the conduction of an experiment is an act/trait that a scientist possess that will make him/her repeat an experiment for the purpose of verifying the data gotten from the previous experiment
hence the answer to the question is to Ensure that his conclusion is supported by evidence.
Please help! Select all the compounds listed below that are covalent compounds.
SO2
NaOH
CH4
CABr2
A light strikes the boundary of a medium at a 45 degree angle instead of entering the second medium the light reflects back into the first medium what can you conclude about the indexof refraction of the second medium
Answer:
The phenomenon that works here is called Total internal reflection
Explanation:
When the angle of incidence is increased past the critical angle, the refracted angle will not exit the medium and all incident light will reflect back off a boundary back into the first medium.
This phenomenon is called Total Internal Reflection. Total Internal Reflection will only occur with a large angle of incidence that is greater than the critical angle.
Now, when we talk about the second medium
using the Law of refraction
Sini/Sinr =refractive index of medium 2/ refractive index of medium1
when the light ray passes from denser medium to rarer medium TIR happens along with angle of incident should be greater than critical angle. In this case incident angle is 45 degrees
conclusion: medium 2 is rarer here than medium 1
There are two compounds of gold and chlorine. In one compound, there is 15.39 g of gold for every 2.77 g of chlorine. In the other compound, there is 7.74 g of gold for every 4.18 g of chlorine.
Find the ratio of masses of gold in the two compounds (give in 'y:x' format)
The answer is 3:1 so whoever this helps
Answer:
The ratio of the masses of gold in the two compounds = 3 : 1
Explanation:
In compound 1:
15.39 g of gold combines with 2.77 g of chlorine
mass of gold that will combine with 1 g of chlorine = 15.39/2.77 = 5.55 g
In compound 2:
7.74 g of gold combines with 4.18 g of chlorine
mass of gold that will combine with 1 g of chlorine = 7.74/4.18 = 1.8 g
Ratio of gold in the that combines with 1 g of chlorine in the two compounds is given as
5.55/1.85 = 3
Therefore, the ratio of the masses of gold in the two compounds = 3 : 1
Is an atom a system?
Answer:
Yes an atom is a system because,the Bohr or solar system model of the atom states that atoms consist of a nucleus with a number of electrons in orbits around that nucleus, similar to a solar system. People have speculated that perhaps atoms are tiny solar systems.
what are all of the man made elements
Answer:
technetium,promethium,polonium.and astatine
Explanation:
chemical properties can be used to
Answer:Chemical properties can be contrasted with physical
Explanation:
WILL GIVE BRAINLIEST!!!!!
osmium, magnesium, titanium, iron
Explanation:
WILL MARK BRAINLIEST
Predict the charge each of the following atoms would have as an ion-if more than one charge is possible,
include each different charge
A. Cl
B. Na
C. Mg
D. O
E. Al
F. N
G. Be
H. Ne
Explanation:
A. Cl⁻
B. Na⁺
C. Mg⁺⁺ Or Mg²⁺
D. O²⁻
E. Al³⁺
F. N³⁻
G. Be²⁺
H. Ne (No charge because it's an noble element)
A- a student has 10.0g sample of CaBr2. Show the setup of the calculation to determine the number of moles of CaBr2 in the sample include units in the setup .(you do not need to do any calculations)
B- what number in addition to the answer to part A is needed to determine the number of atoms of Ca in the sample?
C-a different student is given a 10.0g sample labeled CaBr2 that may contain an inert (non reacting) impurity, identify a quantity from the results of a laboratory analysis that the student could use to determine whether the sample is pure.
D-explain why CaCl2 is likely to have properties similar to those of CaBr2
Answer:
See explanation
Explanation:
a) number of moles = reacting mass/molar mass
Reacting mass = 10g
Molar mass of CaBr2= 200 g/mol
Number of moles = 10g/200g/mol
b) Avogadro's number = 6.02 × 10^23
c) melting point of the CaBr2
Recall that pure substances have sharp melting points while impure substances melt over a range of temperatures.
d) They are both halide salts of calcium hence they are expected to display similar chemical properties.
Which of the following is the best example of solar energy being converted into chemical energy?
Can someone help me pleaseeeeee!!!!
How many molecules are in 23.45 moles of oxygen (O2)?
I NEED HELP WITH THIS QUESTION!! The question: In the doorbell configuration, describe what is initiated when someone presses the button outside your home.
Answer:
When the bell is rung the switch closes allowing electricity to flow making the hammer hit the bell, making the sound to alert people in the house.
Explanation:
Mari wonders why some parts of the hoodoo seem to be wearing away faster than others. Which factor causes this to happen? *
Some parts of the hoodoo seem to be wearing away faster than others as earth material produced by erosion; small, solid particles of matter derived from rocks or perhaps the remains of organisms.
What is hoodoo ?A hoodoo is indeed a tall, thin rock spire created by erosion. It is also known as a tent stone, fairy chimneys, and earth pyramid. Typically, hoodoos are made of very brittle rock that is covered in harder, less brittle stone that shields each column first from weather.
Hoodoos can have varying colors over the course of their height due to minerals deposited within various types of rock. Some parts of the hoodoo seem to be wearing away faster than others as earth material produced by erosion; small, solid particles of matter derived from rocks or perhaps the remains of organisms.
Therefore, some parts of the hoodoo seem to be wearing away faster than others as earth material produced by erosion; small, solid particles of matter derived from rocks or perhaps the remains of organisms.
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A red hot iron bar is dipped into 600 ml of water ( 600. g of water) which causes
the temperature of the water to rise from 22 degrees celcius to 89 degrees
celcius. Determine the heat lost by the iron bar. ****hint: The amount of heat lost
= amount of heat gained *
Answer:
heat lost by iron bar is 168.2 kJ
Explanation:
The heat gained by the water as a result of temperature rise is given by:
Q = mCΔT
ΔT = change in temperature = final temperature - initial temperature = 89°C - 22°C = 67°C
m = mass of water = 600 g
C = specific heat of water = 4.184 J/g-K
Q = heat gained
Substituting:
Q = 600 * 4.184 * 67
Q = 168.2 kJ
The heat gained by the water is 168.2 kJ
The heat lost by iron bar = heat gained by water
heat lost by iron bar = 168.2 kJ
Which of these describes the structure of the endoplasmic reticulum A:A system of folded membranes B:A tiny organelle that has no membrane C:A rigrid protective layer found outside of the cell membrane D:an organelle surrounded by a double membrane and containing DNA
Answer:
A: A system of folded membranes
Explanation:
The endoplasmic reticulum is one of the organelles found in an eukaryotic cell. It is a membrane-bound organelle made up of two structures called CISTERNAE (sac) AND SHEET (membranous)
The endoplasmic reticulum is part of the endomembrane system, which is a system of folded membranes, which extends to the membrane that bounds the nucleus. It is of two types viz: rough endoplasmic reticulum and smooth endoplasmic reticulum.
If we want to know how many neutrons an element has we:
a. look at Period Number ( row)
b. subtract Atomic Number from Atomic Mass
c. look at Atomic Mass (below element symbol)
d. look at Atomic Number (above element symbol)
Answer: B
Explanation: I don’t really know how to explain this because it’s just something my teacher told me and it just stuck in my head
A student has a sugar cube and a glass of tea.
What are two ways the student can increase the speed at which the sugar
cube dissolves in the glass of tea?
O A. Add more sugar cubes to the tea.
B. Add ice cubes to the glass of tea.
C. Stir the tea after adding the sugar cube.
D. Break the sugar cube into smaller pinces.
Answer:
D or C Because C speads up the process while D makes the water have to process less But I say C
Explanation:
could I get brainlists plz
Answer: C & D
Explanation: hope this helps
1) All atoms of the same element must contain the same: a) mass number b) protons c) neutrons d) compounds
Answer:
all atoms of the same element mist contain the same number of. protons
Explanation:
For isotopes, only the number of neutrons has been changed. examples are carbon-12 carbon-13 and carbon-14, because none of these situations change the number or protons, the atomic number stays the same regardless
Can any kind soul help me ASAP
Answer:
in my opinion its going to be B because the moles of experiment I are more than moles of experiment II
_____ is a complex carbohydrate used to store
energy in animals.
Answer:
Glycogen
Explanation:
What happens when the chemicals inside an instant cold pack mix together
A.the mixture inside the pack gives off coldness
B.the mixture generates static electricity
C.the mixture absorbs thermal energy from the surroundings
D.the mixture releases thermal energy into the surroundings.
Answer:
the answer is C
Explanation:
there is no such thing as COLD exept absolute ZERO. anything that feels COLD, perse, is just tranfering your thermal energy into it, since it is lacking that energy
When the chemicals inside an instant cold pack mix together then the mixture absorbs thermal energy from the surroundings.
How heat is flow?Heat always flow from hot body to cold body in order to maintain the equilibrium between two bodies.
So when the chemicals inside an instant cold pack mix together then they will absorbs heat in the form of thermal energy from the surronding as they are in cool temperature and will not able to give off heat.
Hence absorption of thermal energy from the surrounding takes place.
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White powder lab analysis
1. The modern periodic table is ordered by which of the following factors?
A. The number of electrons
B. The number of protons
C. The atomic mass
D. The elements
Answer:
C
Explanation:
What is a change in the environment outside of the organism
At room temperature(20°C), water is a:
solid
liquid
gas
Answer:
Solid
Explanation:
At room temperature(20°C), water is a:
What is the charge of a lithium ion
Answer:
+1
Explanation:
lithium is in group 1 of the periodic table and all group 1 elements have a charge of +1
