Answer:
Explanation:
moler mass of Cu is 63.546 g/mol. Since 63.546 g of copper has 6.022 x 10 power(23) atoms (Avogadro's number). = 9.5 x 10(power)21 atoms of copper.
So What Happens to the Body When We Warm. Up?
Task 2: Fill in the gaps with the words on the next page.
We warm up to...
1. Gradually increase the heart rate and hence the blood flow to the muscles, supplying them
which allows them to work more intensively and efficiently with more elasticity
with
2. Remove waste fluid and waste products from the
cardiovascular system, e.g. helps to avoid a bulld-up of lactic acid
by acceleration of the
3. Increase the depth and rate of
ensuing exercise
required to achieve the appropriate level for
4. Increase the supply of
to the joints. This lubrication increnses the range of
notion in the joints and helps to decrease wear and tear,
5. Increase the body temperature giving increased muscle efficiency and
6. Improve
and dilate lopen up the skin vessels in
order to allow heat loss and body temperature to be maintained at safe levels.
Answer:
Option 1.
Explanation:
When we warm up, our heart rate increases and we require much more energy to continue. Hence, our body absorbs much more oxygen from the surroundings, digest food and etc.
Sorry if the explanation might sound wrong, I learned this during science 2 years ago so I forgot.
Explain why lithium fluoride is a solid at room temperature
NEED HELP ASAP!!!
Please choose correctly!!
Will mark brainliest thank you!!!
what element has the same number of valence electrons as argon
Answer: There are two elements actually and those elements are Carbon and Silicon
Explanation:Plz mark brainliest if im right
The photograph shows a way individuals work together in groups.
Which term best describes the kind of work shown in the photograph?
Answer: Postindustrial
Explanation:
I just took the test hope this helps: )
Answer: A: Postindustrial
Explanation:
3
Question 6 (2 points)
An increase in the level of carbon dioxide in the atmosphere would result in:
Answer:
Air pollution
Explanation:
Carbon(IV)oxide is sometimes harmful to man but good for plant in other to manufacture their food
There are 0.5 moles of carbon, 1 mole of hydrogen, and 0.25 mol of
oxygen. What is the empirical formula of this compound?
Answer:
C₂H₄O
Explanation:
The empirical formula of a compound is defined as the simplest whole number ratio of the atoms present in a molecule. As we have in the molecule Carbon, Hydrogen and Oxygen to find the simplest ratio we need to divide each number of moles in the moles of Oxygen (The lower number). As follows:
C = 0.5mol C / 0.25mol O = 2
H = 1 mol H / 0.25mol O = 4
O = 0.25mol O / 0.25mol O = 1
The empirical formula is:
C₂H₄O(c) Magnesium has atomic number 12.
Magnesium exists as magnesium-24, magnesium-25 and magnesium-26 atoms.
Explain, in terms of protons and neutrons, why these atoms are isotopes
of magnesium
(2)
PLEASE HELP URGENT
Answer: The magnesium 24, 25, and 26 atoms are isotopes because they all have the same number of protons but they have different mass numbers
Explanation: isotopes of an element have the same number of protons but different mass number. So for magnesium 24, the number of protons is 12 and the number of neutrons is 12.
For magnesium 25, the number of protons would still be 12 but the neutrons would be 13.
Magnesium 26, the number of protons would be 12 and neutrons number is 14
Show how the limiting reactant is determined for 3.80 g of magnesium reacting with 12.5 g of oxygen.
Answer:
Magnesium is the limiting reactant.
Explanation:
The balanced reaction is:
2 Mg + O₂ ⇒ 2 MgO
By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following quantities participate in the reaction:
Mg: 2 molesO₂: 1 moleMgO: 2 molesBeing the molar mass:
Mg: 24.31 g/moleO₂: 32 g/moleMgO: 40.31 g/moleThen the following quantities of mass participate in the reaction:
Mg: 2 moles* 24.31 g/mole= 48.62 gO₂: 1 mole* 32 g/mole= 32 gMgO: 2 moles* 40.31 g/mole= 80.62 gThe limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.
To determine the limiting reagent, it is possible to use the reaction stoichiometry of the reaction. You can use a simple rule of three as follows: If by stoichiometry of the reaction 32 grams of oxygen react with 48.62 grams of magnesium, 12.5 g of oxygen will act with how much mass of magnesium?
[tex]mass of magnesium=\frac{12.5 g of oxygen*48.62 grams of magnesium}{32 grams of oxygen}[/tex]
mass of magnesium= 18.99 grams
But 18.99 grams of magnesium are not available, 3.80 molesgrams are available. Since you have less mass than you need to react with 12.5 grams of oxygen, magnesium will be the limiting reagent.
Question 13 (3 points)
.Which one of the following is not a scientific variable?
independent
statement
O control
dependent
Which substance is made up of molecules that can have temporary dipoles?
a. CO2
b. NH3
c. N2
d. H2O
Answer:
Molecules that contain dipoles are called polar molecules and are very abundant in nature. For example, a water molecule (H2O) has a large permanent electric dipole moment.
so it is (D). H2O
Explanation:
Based on the nature of intermolecular forces, the molecule that can have a temporary dipole is nitrogen gas, N2.
What are temporary dipoles?Temporary dipoles are created when electrons revolving around the nucleus, spontaneously come into close proximity resulting in an uneven distribution of electrons, thereby creating a temporary dipole due to unbalanced charges.
Temporary dipoles can initiate weak intermolecular attraction between neighboring molecules such as van der Waal's forces.
Temporary dipoles can occur in non-polar molecules such as nitrogen gas resulting in the ability of nitrogen to be liquefied.
Therefore, the molecule that can have a temporary dipole is nitrogen gas, N2.
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How does climate change
relate to energy?
Some molecules in air contain .
Explain how atoms from the air can become part of human cells
The atoms in air are combined with oxygen present in the air and when we inhale the air, oxygen is moved into the body then atoms in oxygen are carried by red blood cells the blood is pumped to the lungs and when oxygen is transported to the body organ, the atoms in lungs become the part of human cells.
Cobalt(II)chloride is commonly obtained from chemical supply houses as a hydrate with the formula CoCl2.6H2O. An analysis showed that 25.0g of this hydrate contains 11.3g of water. What us the present water by weight in this hydrate?
Answer:
The present water by weight for the hydrate = 45.2%
Explanation:
From the given information;
The present water by weight = (weight of the water/ total weight of the hydrate) × 100
The present water by weight = (11.3/25) × 100%
The present water by weight = 0.452 × 100%
The present water by weight for the hydrate = 45.2%
LINKING IN
TECHNICAL OBJECTS
1 a) What is linking?
Answer:
A link is a fastening unit that attaches two parts of an object together
Different types of links have different characteristics
Answer:
Linking is the process of combining all the component object files. The linker determines where the code will reside in memory and how control will transfer between the components.
Intermolecular forces and Kinetic energy together help determine whether a substance will
be a solid, liquid, or a gas
True or false
Answer:
true
Explanation:
What is an analyte in chemistry?
Answer:
A substance being analyzed by (for example) mass spectrometry, infrared spectroscopy, NMR spectroscopy, or chromatography. In NMR spectroscopy, the analyte is often a solution in a deuterated solvent such deuterochloroform
Explanation:
Answer An analyte', component (in clinical chemistry), or chemical species is a substance or chemical constituent that is of interest in an analytical procedure. The purest substances are referred to as analytes. Example : 24 karat gold, NaCl, water, etc.
: A substance being analyzed by (for example) mass spectrometry, infrared spectroscopy, NMR spectroscopy, or chromatography. In NMR spectroscopy, the analyte is often a solution in a deuterated solvent such deuterochloroform (CDCl3; chloroform-D) or deuterated water (heavy water; D2O). hope this helps have a bless night❤️❤️❤️
Explanation:
Which of the three phases of matter solid liquid or gas has particles that are fast moving and independent of each other??? Also this is science class work
The Answer is Solid
Explanation:
the particles in a solid are vibrating very fast and are packed together so they're independent one each other.
____33. When an atom undergoes gamma decay, the atomic number of the element
a. remains the same.
b. decreases by one.
c. increases by one.
d. increases by two.
____34. Radioactive materials change into new _______________ during radioactive decay.
a. compounds
b. atoms of the same material
c. elements
d. neutrons
____35. Nuclear fission is the:
a. Production of uranium.
b. Splitting of protons by bombarding them with neutrons.
c. Splitting of atoms by bombarding them with neutrons.
d. Result of neutrons smashing into each other.
____36. During fission:
a. Electrons are released and cause more fission.
b. Protons are released and cause more fission.
c. Uranium is produced.
d. Neutrons are released and cause more fission.
____37. Separating U-235 from U-238 was difficult because:
a. There was so much more U-235 than U-238
b. There was so much more U-238 than U-235.
c. A chain reaction would result.
d. They are chemically identical.
Part IV: True/False
____ 38. The mass of the nucleus is small compared to the mass of the atom.
____ 39. Alpha particles would be harder to turn than Beta particles.
____ 40. Positive charge was spread all throughout the atom in the Rutherford Model.
____ 41. The Manhattan Project was located in New York for most of its duration.
____ 42. The cathode rays produced by Thomson were identical for all filaments.
____ 43. It is possible to know where an electron is and what path it is on.
____ 44. X-rays are produced when fast moving electrons strike phosphor coatings.
Answer: Because only energy is emitted during gamma decay, the number of protons remains the same. Therefore, an atom does not become a different element during this type of decay. Q: The Figure below shows how helium-3 (He-3) decays by emitting a gamma particle.
Answer:
yes
Explanation:
33c 32 c 33d 34a 35 b 36a 37 d
Which substance contains positive ions immersed in a sea of mobile electrons?
a. O2 (s)
b. CuO (s)
c. Ag (s)
d. SiO2 (s)
The substance, silver (Ag), we can see positive ions immersed in a sea of mobile electrons.
What is metallic bond?The term metallic bond refers to the bonding between metal atoms. This bonding consists of positively charged ions and a sea of electrons bonded together electrostatically.
Hence, in the substance, silver (Ag), we can see positive ions immersed in a sea of mobile electrons.
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(41). Which of the following molecules is (are) polar? For each
polar molecule, indicate the direction of polarity—that is,
which is the negative end, and which is the positive end
of the molecule.
(a) BeCl2
(c) CH3C
(b) HBF,
(d) SO3
Answer:
The oxygen is the negative end of the molecule, while the area between the hydrogen atoms is the positive end of the molecule. Figure 2. Water is a polar molecule, as greater electron density is found around the more electronegative oxygen atom.
how does a drupe fruit differ from a hesperidum fruit.
Answer:
hi
Explanation:
Answer:
Fleshy Fruits: All of most of the ovary wall (pericarp) is soft or fleshy at maturity. ... partitions, juicy seed vesicles, and a leathery exocarp similar to a hesperidium. ... This is a very common dry fruit found in many different plant families.
Explanation:
How many elements are in H2O
Answer: bale 2 elements sya ang mga yon ay hydrogen at oxygen.
H2O is a molecule made of H for hydrogen and O for oxygen. There are 12 of these molecules. The smaller number is the number of atoms of the element to the left of it.
MARK ME AS A BRAINLIEST PLEASE
H₂O, which represents a molecule of water, consists of three atoms: two hydrogen atoms (H) and one oxygen atom (O). Therefore, H₂O contains a total of three elements: hydrogen and oxygen.
What is H₂O?H₂O represents a molecule of water. The "H" stands for hydrogen, and the "O" stands for oxygen.
Hydrogen (H) is a chemical element with the atomic number 1. It is the lightest and most abundant element in the universe. Hydrogen atoms consist of a single proton in the nucleus and one electron in orbit around the nucleus.
Oxygen (O) is a chemical element with the atomic number 8. It is a highly reactive and abundant element, making up a significant portion of the Earth's atmosphere and the compounds found on Earth. Oxygen atoms consist of eight protons in the nucleus and eight electrons in orbit around the nucleus.
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blance: Mg + HNO2 → Mg(NO2)2 + H2
Explanation:
Mg + 2HNO2 → Mg(NO2)2 + H2
Answer:
Mg + 2HNO2 → Mg(NO2)2 + H2
Explanation:
What is the density of a 32g toy car that
has a volume of 8cm3?
A. 256alcm3
An3
Answer:
density=mass/volume
density=32/8
density=4
Which of the following dilutions would produce 2.0M acid from 3.0M acid
A) 3.0mL acid and 2.0mL water
B) 2.0mL acid and 1.0mL water
C) 2.0mL acid and 3.0mL water
D) 1.0mL acid and 2.0mL water
Answer:
that's a little bit difficult question
Explanation:
sorry !
Each family in the periodic table has its own characteristic properties based upon its number of valence electrons.
True or False
If
two open cans of different diameters were left
out in the rain, how would the amount of
water they collected compare? How would the
depth of water in the cans compare?
What is the best color? Personally I think its purple.
A car accelerates from 10 km/h to 80 km/h in 8.0 seconds. Determine the car’s acceleration in m/s2.
Answer:
The difference in velocity divided by rate = acceleration.
80 - 10 = 70km/h
60 sec. per hour, so 70 × 60 = 4,200 km/s
4.200/8=525
520/60 = 8.6666666667 km/h
Explanation:
Not the answer but hope it puts you in the neighborhood.
The resultant acceleration of the car is 2.43 m/s².
What is acceleration?Acceleration is define as the rate of change of velocity with respect to the time and it will be calculated as:
Acceleration = Velocity / Time
Given that, velocity of car = 80km/h - 10km/h = 70km/h
As we know that 1 km = 1000m
and 1 hour = 3600 sec
So that 70km/h = 19.4 m/s
Given time = 8 sec
Now putting values on the acceleration equation, we get
Acceleration = 19.4 m/sec / 8sec = 2.43 m/s²
Hence required acceleration is 2.43 m/s².
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