Answer:
b
Explanation:
The stone will feel warmer than the glass after 20 minutes.
What is Conduction?This can be defined as a process of heat transfer which involves direct contact between the objects.
The stone and the lamp in contact with each other means heat will be transferred to the stone thereby making it warmer and the reason why option B was chosen as the most appropriate choice.
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Carbon-11 is a radioactive isotope of carbon. Its half-life is 20 minutes. What amount of the initial mass of 70.0g of C-11 atoms in a sample will be left after 80 minutes?
a)5.68 g
b)4.38 g
c)4.20 g
d)3.96 g
e)50.00 g
Answer:
Option B. 4.38 g
Explanation:
The following data were obtained from the question:
Half life (t½) = 20 mins
Original amount (N₀) = 70 g
Time (t) = 80 mins
Amount remaining (N) =.?
Next, we shall determine the decay constant. This can be obtained as illustrated below:
Half life (t½) = 20 mins
Decay constant (K) =.?
Decay constant (K) = 0.693/ half life (t½)
K = 0.693/20
K = 0.03465 min¯¹
Finally, we shall determine the amount remaining after 80 mins as follow:
Original amount (N₀) = 70 g
Time (t) = 80 mins
Decay constant (K) = 0.03465 min¯¹
Amount remaining (N) =.?
Log (N₀/N) = kt/2.303
Log (70/N) = (0.03465 × 80)/2.303
Log (70/N) = 2.772/2.303
Log (70/N) = 1.2036
Take the anti log of 1.2036
70/N = antilog (1.2036)
70/N = 15.98
Cross multiply
70 = N × 15.98
Divide both side by 15.98
N = 70/15.98
N = 4.38 g
Therefore, the amount of the isotope remaining after 80 mins is 4.38 g
Which weighs more, 5.25 g of gold or 525 mg of gold?
A. 5.25 g
B. 525 mg
Answer:
A) is best answer and would be 5250mg
Explanation:
What is the wavelength in meters of a proton (mass = 1.673 x 10-24 g) that has been accelerated to 5% of the speed of light?
Explanation:
since it has been accelerated to 5℅ of the sleec of light then
v= 5/100 × (3× 10^8)
after getting velocity you'll substitute the values in the formula
de Broglie wavelength= h/mv
don't forget to change the grams in mass to kg
aorry I don't hav my calc with me
What is science? what is science?
We define science as the knowledge that seeks to understand truths or natural laws to explain .
What science concept?In the most specific sense of the word, science is that type of knowledge that seeks to understand truths or natural laws to explain the functioning of things and the universe in general.
The concept of science can be defined as a body of systematized knowledge acquired through observation, identification, research and explanation of certain categories of phenomena and facts, and formulated methodically and rationally.
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Answer:
Science is the acquisition of our own knowledge through experimentation to explain and describe natural phenomena.
Explanation:
Science comes from the Latin word, Scientia, which means knowledge. Knowledge are facts that can be verified.
The grassland have experience a long season of drought which group of organisms would be affected first A decomposer B herbivores C omnivorous D carnivores
Answer:
Herbivores?
Explanation:
The answer is Herbivores because plants are their main source of food and diet. They would be affected first throughout the drought.
(I hope this is a good answer, it is my first time answering a question. I will change this if it is wrong!)
Between ethane and ethene, ethane is the most reduced substance. Explain why
please hurry
Olivia is visiting her cousin Meg in Australia for Christmas. She is packing some beachwear to enjoy the beach during her Christmas vacation in Australia. Her friend Holly is puzzled as to why she’s packing beachwear for a December vacation.
Choose all the statements that Olivia can use to explain the reason to her friend Holly.
Group of answer choices
At any given time, different parts of Earth experience different seasons.
At any given time, all parts of Earth experience the same season.
Summer occurs when sunlight reaches the northern or the southern hemisphere directly.
Summer Occurs when sunlight reaches the northern or the southern hemisphere indirectly.
When the southern hemiphere is tilted towards the sun, it receives more sunlight, so southern hemisphere experiences summer.
Winter occurs when sunlight reaches the northern or the southern hemisphere directly.
-- At any given time, different parts of Earth experience different seasons.
-- At any given time, all parts of Earth experience the same season. NOT
-- Summer occurs when sunlight reaches the northern or the southern hemisphere directly.
-- Summer Occurs when sunlight reaches the northern or the southern hemisphere indirectly. NOT
-- When the southern hemisphere is tilted towards the sun, it receives more sunlight, so southern hemisphere experiences summer.
-- Winter occurs when sunlight reaches the northern or the southern hemisphere directly. NOT
In other words, December in Australia is like June in the central and south USA, Mexico, Guatemala, Nicaragua, El Salvador, Honduras, and Costa Rica.
Different parts of the earth experience different seasons, and the summers are due to the tilt of the axis that causes sunlight to reach the hemisphere.
What are seasons?Seasons are the climatic variation due to the tilted axis of the planet that results in different amounts of sunlight reaching the planet.
The region facing and tilted towards the sun experiences summers as the sun rays are direct towards that region.
As the axis is tilted towards the southern hemisphere then the region will experience the summers season, unlike the northern hemisphere.
Therefore, different parts of the earth undergo different seasons.
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Which has greater internal energy, 1 kg of water or 1 g of water, at the same temperature?
1kg of water has greater internal energy compared to 1g of water because 1kg of water has more mass.
Which rock is an example of a clastic sedimentary rock?
shale
iron ore
rock salt
limestone
Answer:
Shale
Explanation:
Answer: Shale
Explanation:
1. Warm air puts more pressure on Earth than cooler air does.
True
False
Answer:
false I think, but not so sure
Examine the chemical equation and statement.
Mg+2HCl⇌MgCl2+H2
The reaction is at equilibrium. The forward reaction is endothermic, and the reverse reaction is exothermic.
Given a decrease in temperature, how would the reaction shift?
a. A decrease in temperature will cause the reaction to shift toward the endothermic reaction, which has the reactants MgCl2 and H2.
b. A decrease in temperature will cause the reaction to shift toward the endothermic reaction, which has the reactants Mg and HCl.
c. A decrease in temperature will cause the reaction to shift toward the exothermic reaction, which has the reactants Mg and HCl.
d. A decrease in temperature will cause the reaction to shift toward the exothermic reaction, which has the reactants MgCl2 and H2.
Answer:
d
Explanation:
the endothermic reaction absorbs heat and exothermic emits heat. If we think of this from increasing the temperature, exothermic already emits heat so it would favor an endothermic reaction. In this instance, a decrease in temperature would do the opposite, which would favor the exothermic reaction.
The purpose of the commas in this sentence to
Answer:
Commas are used to divide or separate parts of a sentence in order to make the meaning clear and the sentence easier to read. They mark a brief pause in the sentence, usually at a point where you would naturally pause if you were speaking rather than writing.
Explanation:
can i get brainly g?
An example of a heterogeneous mixture is
A) soil
B) sugar
C) carbon monoxide
D) carbon dioxide
Answer: soil
Explanation:
Soil is composed of various substances in varying proportion.
An example of a heterogeneous mixture is soil as it composed of different phases while all the other 3 substances are composed of single phase.
What is a heterogeneous mixture?
Heterogeneous mixtures is defined as a type of mixture where in the composition is not uniform throughout the mixture.It consists as two or more phases. The phases are chemically distinct from each other.
As there are two or more phases present in heterogeneous mixtures they can be separated by solvent extraction where in one phase is miscible with the solvent and the other phase is immiscible.
Components of a heterogeneous mixtures are distinctly visible . There are two types of heterogeneous mixtures, the colloids and the suspensions.These two vary with each other with respect to particle size.
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Which statement best describes how electrons till orbitals in the penodic table?
Electrons fill orbitals in order of their increasing energy from left to right
o Electrons fill orbitals in order of their increasing energy from right to left
Elements fill orbitals in order of increasing energy from top to bottom in each group
Elements fill orbitals in order of increasing energy from bottom to top in each group.
Answer:
Electrons fill orbitals in order of increasing orbital energy
Explanation:
Apex
The periodic table consists of elements placed in increasing order of atomic numbers. In the table, electrons fill orbitals in increasing orbital energy. Thus, option A is correct.
What is the Aufbau principle?
The Aufbau principle states the filling of the orbitals and subshells of the atom with the electrons based on the energy levels. The electron occupies the lowest energy level.
The filling of the electron proceeds with an increase in the energy levels or the orbitals that in a periodic table increases from left to right across a horizontal row.
In a period, the number of the subshell or orbitals increases with an increase in the atomic number. The electron fills the higher energy levels after they have completely occupied the low energy levels.
Therefore, in option A. the electrons fill from an increasing order of energy levels.
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The volume of a beaker is 65.0 mL. What is the volume of
water that you need to fill up the beaker in cubic centimeters?
Answer
65cm^3
Explanation
1mL=1cm^3
so; 65.0mL=65cm^3
4. What is the dependent variable in the statement below?
If the amount of coffee that Megan drinks
before bed increases, then the amount of sleep
she gets will decrease.
A. Amount of sleep
B. Amount of coffee
C. Type of drink
D. Before bed
What is the mass in grams of 2.33 x 1020 atoms of Na?
answer and explnation on the picture if you have any quation let me know
Determine whether or not each chemical formula is an empirical formula. CaCO3 Choose... C6H12O6 Choose... NaMnO4 Choose... Ba3(PO4)2 Choose... K2C2O4 Choose...
Answer:
CaCO3: empirical.
C6H12O6: not empirical.
NaMnO4: empirical.
Ba3(PO4)2: empirical.
K2C2O4: not empirical.
Explanation:
Hello.
In this case, since the empirical formula of a chemical compound is the smallest whole number ratio of atoms of each element in the compound, for each compound we proceed as follows:
CaCO3: it is empirical since the subscripts there cannot be reduced anymore.
C6H12O6: not empirical since the smallest whole number ratio of atoms would be CH2O.
NaMnO4: it is empirical since the subscripts there cannot be reduced anymore.
Ba3(PO4)2: it is empirical since the subscripts there cannot be reduced anymore.
K2C2O4: not empirical since the smallest whole number ratio of atoms would be KCO2.
Best regards.
The chemical formula that are empirical and not empirical are:
[tex]CaCO_3[/tex]- empirical[tex]C_6H_{12} O_6[/tex]- not empirical[tex]NaMnO_4[/tex]- empirical[tex]Ba_3(PO_4)_2[/tex]- empirical[tex]K_2C_2O_4[/tex]- not empiricalEmpirical formulaA chemical compound's empirical formula is the smallest whole-number ratio of atoms of each element in the compound.
[tex]CaCO_3[/tex]: it is empirical since the subscripts there cannot be reduced anymore.
[tex]C_6H_{12} O_6[/tex]: not empirical since the smallest whole number ratio of atoms would be [tex]CH_2O[/tex]
[tex]NaMnO_4[/tex]: it is empirical since the subscripts there cannot be reduced anymore.
[tex]Ba_3(PO_4)_2[/tex]: it is empirical since the subscripts there cannot be reduced anymore.
[tex]K_2C_2O_4[/tex]: not empirical since the smallest whole number ratio of atoms would be [tex]KCO_2[/tex]
Find more information about the empirical formula here,
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Convert 38 kilometers to meters
Answer: 38 km = 38000 meters
Explanation:
1 km = 1000 meters
38 km= 38000 meters
It takes 12.35 grams of acetic acid (CH3COOH; molar mass of 60.05 g/mol) to prepare a
1.5 M solution. What is the volume in L?
Answer:
[tex]V=0.137L[/tex]
Explanation:
Hello.
In this case, since the molarity is computed in terms of the moles of solute (acetic acid) and the volume of the solution in liters, we must first compute the moles of acetic acid by using its molar mass to subsequently compute the volume as follows:
[tex]n=12.35g*\frac{1mol}{60.05g}=0.2057mol[/tex]
[tex]M=\frac{n}{V}\\ \\V=\frac{n}{V}=\frac{0.2057mol}{1.5mol/L}\\ \\V=0.137L[/tex]
Best regards.
ild a model of ethane, CH_3CH_3CH 3 CH 3 . Looking at one of the carbon atoms, what geometry is present?
Answer:
Each carbon atom is tetrahedral
Explanation:
If we consider a model of ethane, we will quickly discover that all carbon atoms are bonded to four other atoms. This means that there are four regions of electron density around each carbon atom.
According to the valence shell electron pair repulsion theory, when a central atom has four regions of electron density on its outermost shell, the molecule must have a tetrahedral geometry.
How many significant figures are in 3.02 x 108 ?
a
2
b 4
C 5
d 3
Answer:
C
Explanation:
the answer has 5 Numbers
All cells must have energy to function. Most of the energy used by the cells in your body is produced by cellular respiration. In cellular respiration, cells use ____________ to release energy stored in __________.
Answer:
In cellular respiration, cells use oxygen to release energy stored in glucose.
If my answer helped, please mark me as the brainliest!!
Thank You!!
Answer:oxygen and sugars
Explanation:
From the statements below identify all the chemical changes
Answer:
um... there are no statements below
Explanation:
I can't really help without any statements.
The greater the amount of matter that is packed into a given space the greater the
Answer:
density
Explanation:
How does the warm water at the bottom of a pot travel up
Answer: Because heat rises and it also makes the water bubble up which creates more height.
Explanation:
Answer Liquid on the bottom of the pot closest to the heat source starts to get hot; as that happens, it rises. The rising hot water is replaced by the cooler, more dense water molecules.
Explanation:
The electron configuration for P is ___.
Answer:
The Electron Configuration for Phosphorus is = 1s^2 2s^2 2p^6 3s^2 3p^3
Explanation:
Here is a sheet of paper that might help you out. You follow the red lines and where it has 3p^6 is if it is a full set. If you count the number that all of those are raised to, then you should get 15 (which is the atomic number).
Sorry, if it is horizontal instead of vertical.
Which part of the experiment is not touched by the independent variable or is the normal/comparison
Matter includes all of the following except
Not everything is matter. Here's a list of what we call NON-MATTER.
___________________________________________________________
Non matter...
LightHeatSound___________________________________________________________
Hope it helps!
May i have brainliest?
[tex]\huge\boxed{Thanks,\;Plip.}[/tex]
An object will float when:
Answer:
Objects with tightly packed molecules are more dense than those where the molecules are spread out
Explanation:
Answer:
it will float when
Explanation:
there is oxygen present of when the object is not dense