Answer:
Cretaceous Period
Explanation:
Dinosaurs went extinct about 65 million years ago (at the end of the Cretaceous Period), after living on Earth for about 165 million years.
when 48 .0g of carbon reacts with oxygen gas to form carbon dioxide, no carbon or oxygen is left over. How much oxygen is reacted if 176.0g of carbon dioxide is produced
Answer:
128g
Explanation:
Given parameters:
Mass of carbon = 48g
Mass of carbon dioxide = 176g
Unknown:
Mass of oxygen that reacted = ?
Solution:
Every chemical reaction must obey the law of conservation of mass. It states that "in a chemical reaction, matter is neither created nor destroyed" .
So;
Mass of carbon + Mass of oxygen = Mass of carbon dioxide
Mass of oxygen = Mass of carbon dioxide - Mass of carbon
Mass of oxygen = 176 - 48 = 128g
Balanced equation for
GaF3 +
Cs →
CSF +
Ga
A vernier calipers are more precise than metre rule
True
False
Answer:
true
Explanation:
Vernier caliper can give exact measurements in mm.
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How many total oxygen atoms are present in the reaction below? (note that it is unbalanced)
C3H7OH + O2 -> CO2 + H2O
What does microbiome do to your cells?
y’all pleasee answer these
potassium(k)=1s22s22p63s23p64s
Answer:
That is correct.
Explanation:
Are two atoms of the same element identical?
Answer:Two atoms of the same chemical element are typically not identical. First of all, there is a range of possible states that the electrons of an atom can occupy. Two atoms of the same element can be different if their electrons are in different states.
Explanation:This is not mine write it in your own words.
Can you guys help me I have missing assignments and I need help.
_____ is the element from which iron is taken.
Carbon
Quartz
Hematite
Which statement below BEST describes the difference between mixtures and pure substances? Group of answer choices Mixtures are made of a single kind of matter but a pure substance is two or more substances that are chemically bonded. Pure substances can be physically separated but mixtures cannot be physically separated. Pure substances are not created through a chemical reaction and mixtures are the result of a chemical reaction. Mixtures can be physically separated but pure substances cannot be physically separated.
Answer: Mixtures can be physically separated but pure substances cannot be physically separated.
Explanation: Mixtures can be physically separated by using methods that use differences in physical properties to separate the components of the mixture, such as evaporation, distillation, filtration and chromatography. A pure substance, any compound or element, can't be separated into different atoms by physical methods. Pure substances are compounds and elements (made up of the same atom or same molecule respectively), while mixtures are an assortment of different substances put together. Hope this helps ^-^.
Pure substances cannot be physically separated but mixtures can be physically separated. Therefore, option (4) is correct.
What are a mixture and pure substance?Pure substances such as elements cannot be created by chemical reactions and cannot be broken down into simple substances. They have only one type of atom in the entire composition.
A pure substance consists of two or more elements that are chemically combined and has a fixed composition such kind of pure substance is called a compound. Pure substances can not be physically separated such as gold, silver, copper, etc.
A mixture is formed when two or more different substances are only physically combined or mixed together. They are not formed by the chemical reaction so that a mixture can be separated physically into its original components.
A mixture cannot be formed from a single type of matter even a homogeneous mixture has two or more types of substances but the composition of the substance in the entire mixture is always the same.
Learn more about mixture and a pure substance, here:
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Breathe.
You are going to be okay.
Breathe and remember that you've been in this place before. You've been this anxious and scared... and YOU'VE SURVIVED.
Breathe and know that you can survive this too. These feeling can't break you.
They're painful and debilitating, but you can sit with them and eventually... they WILL pass.
Maybe not immediately, but sometimes soon, they are going to fade, and when they do, you'll look back at this moment and laugh for having doubted your resilience. I know it feels unbearable right now, but keep breathing, again and again. THIS WILL PASS.
Answer:
thank you so much i really needed that
Explanation:
can someone help answer this? thanks!
if surface tension relies on intermolecular forces, how could you make surface tension decrease?
(think about how and where molecules bind to each other)
Answer:
We could make the surface tension to decrease by removing and causing a disruption to the intermolecular forces(hydrogen bonds).
Explanation:
To explain this answer, we will consider an experiment whereby a paper clip is made to rest at the top surface of water inside a container/beaker.
First of all, the intermolecular forces present in water are also known as hydrogen bonds.
It's relationship with surface tension is that when there is high surface tension in the water, this high tension will allow the paper clip to rest on top of the hydrogen bonds present at the top surface in between the water molecules.
However, the surface tension will decrease when we remove or cause a disruption to the intermolecular forces (hydrogen bonds).
Water has a molar mass of 18.0 g/mol. How many particles of water do you drink if you drink 64 oz., or 1893 grams, of water in a day?
Answer:
[tex] \frac{1839}{18} = 102.16[/tex]
Take 102.16 and multiply by avogadros #
and you get 6.33 × 10^25 otherwise A
Answer:
Answer is A
Explanation:
I just took this.
At what temperature will equal masses of HCl and NH4CI dissolve in 100g water?
Explanation:
NH4Cl at 90°C _.70 a ... m aximum amount of solute that will dissolve at that specific temperature (no ... A mass of 100 g of NaNO3 is dissolved in 100 g of water at 80°C. Is the ... SO2, NH3, HCl.
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what is the magnitude of earthquake took place in manila?
A.5.2
B.5.3
C.5.4
D.5.5
Answer:
i believe its 5.2
Explanation:
What information does a life-cycle diagram of a product contain?
a) Only information about the materials used to make the product
b)Information about the entire process of making a product from start to finish
c) Only information about the recycling process used for that material
d) Only information about how the product is made in a factory
Answer: c
Explanation: i think its right on edge
What is the name of the ionic compound with the formula:
AlF3
Answer:
potassium chloride.
Which has more mass: a stick of 4 counting cubes or a pile of 4 counting cubes?
i have thids quuuuesstttttttiopn
What are the three parts of the cell theory?
What is a speed of 55 mph equivalent to in units of m/s? (1 mile = 1609 m, 1 hour = 3600 s)
Answer:
24.58 m/s
Explanation:
Given that,
Speed of an object = 55 mph
We need to find the equivalent unit in m/s
We know that,
1 mile = 1609 m
1 hour = 3600 s
So,
[tex]55\ mph=\dfrac{55\times 1609\ m}{3600\ s}\\\\=24.58\ m/s[/tex]
So, the required speed is 24.58 m/s.
please help i will mark brainlist
Answer:
432cm³
Explanation:
Given parameters:
Length = 12cm
Height = 6cm
Width = 6cm
Unknown:
V = ?
Solution:
We have been given that;
V = L x W x H
So;
V = 12cm x 6cm x 6cm = 432cm³
what is selection in science?
Answer:
Selection, in biology, the preferential survival and reproduction or preferential elimination of individuals with certain genotypes (genetic compositions), by means of natural or artificial controlling factors.
Explanation:
Hope it helps you
1. A dry, empty bottle is placed in an ice bath. After the air inside the bottle is cooled off, a balloon is placed
over the opening. The bottle with the balloon is then placed in very hot water and the balloon inflated. Why
did the balloon inflate?
Answer:
hot air rises and expanded the balloon
Explanation:
thats it.
7. A sound wave travels 500m in 60 seconds. Calculate the speed of the sound?
Answer:
8.33m/s
Explanation:
Given parameters:
Distance traveled = 500m
Time taken = 60s
Unknown:
Speed of the sound = ?
Solution:
The speed the sound can be derived using the expression below:
Speed = [tex]\frac{distance}{time}[/tex]
So;
Speed = [tex]\frac{500}{60}[/tex] = 8.33m/s
A 13.9 - g piece of metal ( specific heat capacity is 0.449 /g^ C)who whose temperature is 54.2 degrees * C was added to a sample of water at 13.4 degrees * C in a constant - pressure calorimeter of negligible heat capacity . If the final temperature of the water is 15.6 °C, calculate the mass of the water in the calorimeter .
Answer:
26.2g = Mass of water in the calorimeter
Explanation:
The heat absorbed for the water is equal to the heat released for the metal. Based on the equation:
Q = m*C*ΔT
Where Q is heat, m is the mass of the sample, C is specific heat of the material and ΔT is change in temperature
Replacing we can write:
[tex]m_{metal}*C_{metal}*dT_{metal}=m_{water}*C_{water}*dT_{water}[/tex]
13.9g * 0.449J/g°C * (54.2°C-15.6°C) = m(H₂O) * 4.184J/g°C * (15.6°C-13.4°C)
240.9J = m(H₂O) * 9.2J/g
26.2g = Mass of water in the calorimeterDescribe two differences between transition elements and alkali metals?
Explanation:
On the periodic table, we can find a wide range of elements from alkali metals, to the alkali earth metals, transition metals and through to the noble gases.
The alkali metals are found on the first group in the periodic table and they are group of metals. Also, the transition elements are also a group of metals.
Transition elements are known to have variable oxidation states whereas, alkali metals have an oxidation state of +1. Transition metals belong the d-block on the periodic table whereas alkali metals are found in the first group on the periodic table.What mass of aluminum is needed to produce 0.500 mole of aluminum chloride?
Answer: " 13.5 g Al " ;
→ that is: "13.5 grams of aluminum."
____________________________
Explanation:
____________________________
Note: What is missing from the question is the "balanced chemical equation" for the "chemical reaction" that contains:
The reactants: "aluminum (Al) " ; and "chlorine (Cl) " ; and:
The product: "aluminum choloride (AlCl₃) " .
____________________________
The "balanced chemical equation" is:
____________________________
2 Al + 3 Cl₂ → 2 AlCl₃ ;
_____________________________
Note: The molecular weight of "aluminum (Al)" is: " 26.98 g /mol " .
____________________________
So: We call solve using a technique known as: "dimensional analysis" :
____________________________
0.500 mol AlCl₃ * [tex](\frac{2mol Al}{2mol AlCl_{3} }) * (\frac{26.98g Al}{1 mol Al}) = ?[/tex]
____________________________
Note: The units of "mol AlCl₃" cancel out to "1' ; and:
The units of "mol Al" cancel out to "1" ; and we are left with:
____________________________
" [tex]\frac{(0.500 * 2 * 26.98)}{2}[/tex] g Al ["grams of aluminum"] ;
____________________________
Note: We can "cancel out the "2's" ; since "2/2 = 1 " ; and we have:
→ (0.500 * 26.98) g Al ;
= 13.49 g Al ;
→ Round to 3 (Three) significant figures;
→ Since: "0.500" has 3 (Three) significant figures:
____________________________
= 13.5 g Al ; that is: "13.5 grams of aluminum."
____________________________
Hope this is helpful!
Best wishes to you in your academic pursuits—and within the "Brainly" community!
____________________________
Scientists have observed that when oceanic plates and continental plates collide, the oceanic plate is driven under (slides below) the continental plate. The MOST LIKELY reason for this happening is
Answer:
thi s is 4 ano
Explanation:
sjfdbbjjbfogfg
Answer:
the continental plate is bigger than the oceanic plate.
Explanation:
Q1; ___________ have almost half a set of electrons in the outer most energy level.
1- metalloids
2- metals
3- nonmetals
Q2;________ are known to be gasses at room temperature.
1- nonmetals
2- metalloids
3- metals
Answer:
2 metalliods....
1 metals