Answer:
You protect yourself and others from numerous injuries. Such safety equipment would be goggles, tongs, gloves(sometimes), hair pulled back, sleeves rolled up, etc.
Explanation:
Throughout his career Newton had conflict with _____.
John Dalton
Mendeleev
Neil Bohr
Robert Hooke
i need help solving this
Answer:
4
Explanation:
9.7-8.65=1.05
But significant figure rules mean use only the smallest number of significant figures. 9.7 has 2 and 8.65 has 3, so your answer can only have 2 sig figs.
So round 1.05 to 2 figures and you get 1.1
A student wants to perform an experiment to study the relationship between the temperature and pressure of an enclosed gas. In one or two sentences, describe two assumptions that must be made in performing this experiment.(2 points)
BoldItalicUnderline
Answer:
Volume stays constant
Explanation:
When aluminum is placed in concentrated hydrochloric acid, hydrogen gas is produced. 2Al(s)+6HCl(aq)⟶2AlCl3(aq)+3H2(g) What volume of H2(g) is produced when 7.40 g Al(s) reacts at STP?
Answer:
9.18 L
Explanation:
When aluminum is placed in concentrated hydrochloric acid, hydrogen gas is produced. 2Al(s)+6HCl(aq)⟶2AlCl3(aq)+3H2(g) What volume of H2(g) is produced when 7.40 g Al(s) reacts at STP?
first write, then balance the equation
Al + HCl-------------> AlCl3 + H2
2Al + 6HCl-----------> 2AlCl3 + 3H2 2 MOLE
2 moles of Al produce 3 moles of H2
Al is 7.4/27 =
0.27 moles of Al.
this will produce
0.27 X 3/2 moles of H2 =
0.41 moles of H2
PV =nRT
for STP, P = 1 atm, T = 273.2, R IS 0.082
V= (0.41) X 0.082 X 273,2/1 = 9.18 L
CHECK 1 mole of gas at STP has a volume of 22.4 L
0.41 moles then has a volume of 00.41 X 22.4L = 9.,18 L
FREE BRAINIEST WHO WANTS IT?!!!
Answer:
me
Explanation:
me
PLEASSEE HELLP!!
_Which of the following considered as isoelectronic particles? _
(a)7 N-3 ,8 O-2 , 9F-1
(b) 8 O-2 ,9 F-1, 16 s-2
(C) 18 Ar , 20 Ca+2, 11 Na+
(d) 18 Ar , 12 Mg+2, 16 s-2
Answer:
its a
Explanation:
What do you think the ideal pH of a swimming pool should be? Explain.
Answer:
Explanation:
The pH scale goes from 0 to 14, where pH 7 is neutral. If the pH is above 7, the water is basic; if it is below 7 the water is acid. The optimum pH for pool water is 7.4, since this is the same as the pH in human eyes and mucous membranes. A pH of 7.4 also gives good chlorine disinfection.
Acids and bases release what kind of ions in water?
Answer:
"Acids produce hydrogen ions, H+, in water. Bases produce hydroxide ions, OH-."
Explanation:
Answer:
Explanation:
Acids and bases release what kind of ions in water?
Acids release hydrogen ions, bases release hydroxide ions.
the cation H+ of acids consisting of a hydrogen atom whose electron has been transferred to the anion of the acid'
the monovalent anion OH− consisting of one atom of hydrogen and one of oxygen
— called also hydroxide ion
What led to the increase in steel consumption seen on the graph?
The cause that led to the increase in steel consumption seen in the graph is the increase in population.
In the graph, you can see the relationship between the millions of people and steel consumption and the centuries. The graph shows that population growth between 1700 and 1900 was minimal because it did not exceed 100 million people.
From 1900 onwards the population began to grow from 100 million to 600 million.
On the other hand, steel began to be exploited in the mid-1800s and until 1900 it had not exceeded 100 million tons. After 1900 it increased rapidly to 250 million tons and by the year 2000, it had already exceeded 700 tons.
According to the above, it can be inferred that the growth of steel consumption was influenced by the growth of the population.
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What do animal and plant cells have in common
A.both have central vacuoles
B.both have chloroplasts
C.both have cell membranes
D.both have cell walls
Answer:
both have cell membranes
Explanation:
the animal cell has small or temporary vacuoles.
animal cell does not have chloroplast or cell wall.
Please help!!
Soren is making a poster about John Dalton’s understanding of the atom. He wants to emphasize that Dalton’s atomic theory was not completely accurate. Which of these statements should Soren include on his poster to explain what was missing from Dalton’s atomic theory?
A. Atoms are made up of smaller particles.
B. All atoms of the same element are identical.
C. Atoms of different elements have different masses.
D. Compounds form when atoms of different elements combine in a specific ratio.
Answer:C
Explanation:
Rain snow sleet and hail are forms of condensed water vapor in the earth this is known as
A.transportation
B.precipitation
C.evaporation
refer to the example pic for ur reference !!
How is the potential (voltage) of a redox reaction determined using the reduction
potential chart? Calculate the voltage for the equation CuCl2+Zn—->ZnCl2+Cu
The voltage for the equation CuCl₂ + Zn —> ZnCl₂ + Cu is -1.1 Vol.
The response is CuCl₂ + Zn —> ZnCl₂ + Cu, which means that it's miles a dry mobile battery, in which the anode, zinc reacts with chloride this is the cathode. within the dry battery cellular, the chemical power is stored in it, which converts into electrical power.
calculation:-
using an electrochemical chart;
⇒Reduction potential of Zn²⁺ = -0.76
⇒Reduction potential of Cu²⁺ = 0.34
Eo ( voltafe) = Ecathod - Eanode
= -0.76 - 0.34
= -1.1 Volt
Measured redox potentials depend upon the capacity power of valence electrons, the concentrations of the species inside the reaction, and the temperature of the device. the reduction capacity for the opposite of the oxidation 1/2-response and opposite the signal to obtain the oxidation capability. For the oxidation half-response, Eooxidation = - Eoreduction. upload the potentials of the half-cells to get the overall trendy cellular capacity.
Reduction potential (Eo) is defined as a bent of a chemical species to be reduced by way of gaining an electron and is defined with the electrochemical reference of hydrogen.
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80 protons, 119 neutron
You have a glass of liquid and combine it with a mysterious solid and notice that over time the color changes. this questions has two answers
1) give me a scenario that would explain how this coukd be a physical change
2) give me a scenario that would explain how this could be a chemical change
Answer:
This is a verified chemical change. On the other hand, if you add red ink to water, it will turn red. However, we would classify that as a physical change. To conclude, color change is a great indicator that change has occurred.
Explanation:
This is since there are examples of color change being an indicator for both of them. For instance, when you heat the blue copper(II) hydroxide solution, you'll eventually end up with a black copper oxide ( Cu O ) solution. This is a verified chemical change. On the other hand, if you add red ink to water, it will turn red. However, we would classify that as a physical change.
To conclude, color change is a great indicator that change has occurred. However, it does not tell you which type of change might have occurred. You will want to use better indicators - like release of heat - to guide you with that.
Hope that helped :)
an inert gas that has a bigger atomic radius than element E(in number 2)
Explanation:
This is due to the reason that in case of inert gases, the outer shell is complete and it has hence maximum electronic repulsion. Moreover in case of inert gases, the atomic size is expressed in terms of Vanderwaal’s radius because, noble gases do not form covalent bonds while other form covalent bonds and hence their atomic radii is expressed in covalent radius. Generally atomic size decreases while moving from left to right in the periodic table. But in the case of noble gases, they have comparatively higher atomic size than corresponding halogens because of the reason that vanderwaal’s radii (present in noble gases) is much larger than ionic and covalent radii (present in other elements). Thus as, Vanderwaal’s radius is greater than covalent radius, the atomic size of noble gases is larger than other elements of same period.
What Happens During Fermentation?
Answer:
Fermentation is a metabolic process in which an organism converts a carbohydrate, such as starch or a sugar, into an alcohol or an acid. For example, yeast performs fermentation to obtain energy by converting sugar into alcohol.
Sometimes bacteria perform fermentation, converting carbohydrates into lactic acid...
You can look up videos of yeast fermentation in apple juice.
Which of the following can be highly compressed?
a an iron bar
b milk
C liquid water
d nitrogen gas
Explanation:
d. nitrogen gas because of weak intermolecular force
I will give brainliest!!
Match these items.
1. changing from liquid to gas state
2. the combining substances in a reaction
3. radiation
4. slow oxidation
5. melting point of water
6. a reaction between a substance and oxygen
7. pertaining to the nucleus of an atom
8. to fuse or join together
9. rapid oxidation
10. heat
fusion
burning
evaporation
rusting
0 degrees C
gamma rays
thermo-
reactants
nuclear
oxidation
Answer:
1. changing from liquid to gas state
Evaporation
2. the combining substances in a reaction
Reactants
3. radiation
Gamma Rays
4. slow oxidation
Rust
5. melting point of water
0˚ C (0 degrees Celsius)
6. a reaction between a substance and oxygen
Oxidation
7. pertaining to the nucleus of an atom
Nuclear
8. to fuse or join together
Fusion
9. rapid oxidation
Burning
10. heat
Thermo-
The change in liquid to gas state is called evaporation. Evaporating a liquid will energize the molecules and converts them to the gaseous state.
What is change in state?A change in state or phase of a substance is called a physical change where, one state changes to the other like liquid vaporize to form gases.
Thus, first option is matching with 4th one evaporation.
The combining substances in a reaction is called reactants.
One example of radiation given here is gamma rays.
An example of slow oxidation is rusting that is the formation of red iron oxide on corroding metals.
Melting point of water is 0 ⁰C.
A reaction between a substance and oxygen is called oxidation.
A common term pertaining to the nucleus and of an atom is nuclear.
The process of fusing or joining of two species together is called fusion.
Thermal process are involving rapid oxidation.
Heat is a form of energy where overheating anything causes burning.
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37. What name is given to the process in which mineral crystals change during metamorphism
how long does it take to thaw a turkey in the refrigerator?
Answer:
24 hours of thawing it out in the fridge for every 5 pounds
Explanation:
reaction happens when chemical bonds give off heat.
Answer:
Explanation:
Chemical reactions that release energy are called exothermic. In exothermic reactions, more energy is released when the bonds are formed in the products than is used to break the bonds in the reactants. Exothermic reactions are accompanied by an increase in temperature of the reaction mixture.
Amoebiasis is a disease that occurs due to an infection caused by the parasite Entamoeba histolytica. The parasite reproduces rapidly and invades the large intestine.
How does amoebiasis interfere with the normal functioning of the body?
1) It causes the ear to ache.
2) It disrupts the normal intake of air.
3) It causes the skin to itch.
4) It disrupts the normal excretion of solid wastes.
Answer:
4) It disrupts the normal excretion of solid wastes.
Answer:
4
Explanation: Took the test
hey! needing some help with this
Answer: Holmium-165 = Er-165 + electron
Explanation:
Beta decay is the decay of a neutron into a proton and electron. This will increase the number of protons in the Holmium nucleus by one, making it Er, Erbium, with the same atomic mass.
Holmium-165 = Er-165 + electron
The mass is essentially the same, as the proton is assigned the same mass as the neutron it came from.
Holding your hand over a hot plate is an example of
because
Answer:
It ia a example of the heat going onto your hand has you take it out of the microwave touching the plate would just be hurt and probably hurt theres your answer ig?
Explanation:
Answer:
it is an example of convection.
Explanation:
convection is the transfer of heat without touching the substance.
From what you know about helium and the elements in its group, which statement best explains why helium is placed where it is, instead of the second column
Answer:
Helium is a noble gas and shares many properties with the other noble gases in the last column.
Explanation:
got it right
also it is classified as a noble gas, and hydrogen is a nonmetal so obviously they don't fit together, as the group is for alkali metals which Helium obviously isn't.
What is the title with a "salt" compound?
Answer:
Sodium chloride, I think
Explanation:
Salt's compound name is sodium chloride
What is the overall charge ofanion that has 15 protons, 18 electrons and 17 neutrons?
Answer:
-3
Explanation:
What is the overall charge of anion that has 15 protons, 18 electrons and 17 neutrons?
ONLY CHARGED PARTICLES CONTRIBUTE TO THE OVERALL CHARGE, SO
+15 -18 = -3 OVERALL CHARGE
Remember
Proton=+veElectron=-veNeutron=0(neutral)Total charge
No of protons+No of electrons15-18-3Section 1 What is energy? is the ability to cause change. A. B. Energy from motion is energy 1. Kinetic energy increases as an object moves 2. Kinetic energy increases as the of an object increases. energy. C. Energy stored in an object due to its position is energy. D. Energy comes in different 1. Energy that increases as temperature increases is 2 energy-energy stored in chemical bonds 3. energy-light energy 4. Energy from electricity is energy 5. The nucleus of an atom contains energy
Answer:
Kinetic energy
Kinetic energy is the motion of waves, electrons, atoms, molecules, substances, and objects.Explanation:
What are the safety precaution you must do to avoid contamination of the specimen in microscope?
Answer:
Clean the microscope after each use. ...
Handle glass slides carefully. ...
Turn off the light source when the microscope is not in use. ...
Be aware if your microscope has a mercury lamp. ...
When carrying the microscope, always use two hands with one hand supporting the base and theother hand holding the arm.
Explanation:
:)
