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
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.
Learn more about chemical formulas, here:
https://brainly.com/question/16950183
#SPJ2
Imagine that you heat a pot of water to a boil (212°F), then you turn off the stove and let the water sit there. The room is at room temperature (72°F) What temperature do you predict the water cool to after sitting for 8 hours? (
Answer:
72 °F
Explanation:
Hello,
In this case, since matter tend the be stable at conditions they do not change, if we have water at room temperature (72 °F) and we heat it until boiling but then we turn off the stove, we molecularly see that due to the heat, the molecules start moving faster and crashing to each other; however when that fed energy starts being removed as the stove gets turned off, the molecules lose energy causing them to start moving slower so they lose energy until a point the remain at the initial status, that is 72 °F because thermal equilibrium is reached. Therefore it is likely for the water to be at 72 °F as well once 8 hours have passed, because a thermal equilibrium is reached with the environmetnal temperature.
Best regards.
7. If an atom had 10 protons, 8 electrons and 9 neutrons, what would the mass number be?
Answer:
19
Explanation:
10 + 9 protons plus neutrons
what is 23.54 kg x 9.8 m/s2
Answer:
230.692
Explanation:
23.54kg*9.8m/s²= 230.692
Answer:
F = 230.69 N
Explanation:
Given data:
Mass = 23.54 Kg
Acceleration = 9.8 m/s²
Force = ?
Solution:
Mass ×Acceleration is equal to force.
F = 23.54 Kg × 9.8 m/s²
F = 230.69 Kg.m/s²
Kg.m/s² = N
F = 230.69 N
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
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
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.
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
3. Converting from the English system to the metric system can be accomplished using _______
Answer:
You can convert between the various different sizes by merely moving the decimal point the correct number of places. The basic metric units are meters (for length), grams (for mass or weight), and liters (for volume).
Explanation:
What type of energy is the energy of moving things?
a. Mechanical b. Electromagneticc. Sound d. Thermal
Answer:
A. Mechanical
Explanation:
Mechanical energy is the sum of an object's kinetic energy and potential energy, which are both energies of motion.
If you had three molecules of P2SO4, how many total atoms would that be? (will mark brainliest) help me pwzz. i would really be happy if someone helps me
Answer:
pydlhdgkskydkgsoteltstositsoteotsitstositsitstitsitstssyoyos
chemical properties can be used to
Answer:Chemical properties can be contrasted with physical
Explanation:
WILL GIVE BRAINLIEST!!!!!
osmium, magnesium, titanium, iron
Explanation:
What is the amount of heat, in joules, required to increase the temperature of a 49.5-gram sample of water from 22°C to 66°C?
Choose all the answers that apply.
The cell membrane
A.is not a true organelle
B.contains and protects the cell
C.is made of a double layer of phospholipids
D.contains proteins that allow materials to pass through
Answer:
B or D its a tuff call because
Explanation:
the cell membrane keeps toxic substances out of the cell. they contain receptors and channels that allow specific molecules, such as ions, nutrients, wastes, and metabolic products, that mediate cellular and extracellular activities to pass between organelles
Answer:
B. Contains and protects the cell
C. Is made of a double layer of phospholipids
D. Contains proteins that allow materials to pass through.
Explanation:
All are true except A. Is not a true organelle.
The cell membrane is absolutely an organelle.
Hope this helped!
When an unknown amount of methane reacts with 40.7 g of chlorine, 40.5 g of methyl chloride and 36.5 g of hydrogen chloride form how much methane was used round to the tenth
Answer:
36.3 gram
Explanation:
CH₄ + Cl₂ = CH₃Cl + HCl
In any reaction , mass is conserved
mass of product = 40.5 + 36.5 = 77 g
Let methane reacted be x .
mass of reactant = x + 40.7
mass of reactant = mass of product
x + 40.7 = 77
x = 36.3 gram
methane reacted = 36.3 gram.
newly discovered substance on Mars has a mass of 2.3x10-5,g and volume of
200 ml. What is its density in g/mL?
Answer:
The answer is
[tex] \huge 1.15 \times {10}^{ - 7 } \: \: g/ml \\ [/tex]
Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question we have
[tex]density = \frac{2.3 \times {10}^{ - 5} }{200} \\ [/tex]
We have the final answer as
[tex]1.15 \times {10}^{ - 7 } \: \: g/ml[/tex]
Hope this helps you
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.
46. Which set of numbers balances this equation?. Agl + Na2S →
Ag2S + Nal
O 3,7,20
0 2,1,1,2
O 0,5,0,2
O 2,0,0,2
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.
Acceleration is defined as the rate of change for which factor?
A.) displacement
B.) position
C.) time
D.) velocity
Answer:d
Explanation:
Answer:
The correct answer is D. velocity
Explanation:
I had that same question
Please help! Select all the compounds listed below that are covalent compounds.
SO2
NaOH
CH4
CABr2
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:
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.
A chemical equation that shows the formulas of the chemicals involved but not the proportions in which they react is called the
a. word equation
b. balanced equation
c. skeleton equation
d. incomplete equation
A chemical reaction can be expressed in terms of:
words equationthe skeleton equation balanced equationThe skeleton equation is still in unbalanced form
so only chemical formulas of reactants and products so that the relative amounts of the reactants and products are not included
For example :
word equationEthane + Oxygen ⇒ Carbon dioxide + Water
skeleton equationC₂H₆ + O₂ ⇒ CO₂ + H₂O
balanced equation2C₂H₆ + 7O₂ ⇒ 4CO₂ + 6H₂O
incomplete equation2C₂H₆ + 7O₂ ⇒ 4CO₂(H₂0 is still missing)
What is the boiling point of a drop of water
Answer:
The boiling point of water at sea level is 100 degrees Celsius, or 212 degrees Fahrenheit.
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.
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:
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
How many shrimp do you have to eat before you make your skin turn pink?
Answer:
That's kind of a weird question. A lot though.
Explanation:
lot
goofy ahhAnswer:
a
Explanation:
