Which is a pure substance?
A) mixture
B) solution
C) element
What do electron capture and positron emission have in common?
Answer:
They both keep the mass number the same while bringing the atomic number down 1
Explanation:
Answer:
They both keep the mass number the same while bringing the atomic number down 1.
Thank the person above or below! Whoever said this answer just wanted to answer it so I could keep my streek, sorry!
What is the charge of a Gamma particle?
Answer:
+2
Explanation:
I just looked it up, but it says the Alpha Particle charge is +2 so I hope that helps.
Answer:
+2e
Explanation:
edge 2020
Plz help!
What is 1 item that is an element?
Give an example of how the 1 item is an element.
Answer:
Carbon. This item is an element because it is on the periodic table.
Explanation:
Anything on the periodic table is an element.
How many dots would be drawn for the Lewis Dot Structure of gallium?
Answer:
To draw a Lewis dot structure for an atom, you must know how many valence electrons an atom possesses. The periodic table organizes the elements based on the similarity of their chemical properties.
Explanation:
Which element in row 6 of the periodic table (shown below) has the largest radius?
Select one:
a. Hg
b. Cs
c. Os
d. Rn
Answer:
Cs
Explanation:
It has less amount of proton numbers so they won't attract the electrons as much as the other elements with increased number of protons will.
One of your test tubes falls over and breaks during a lab. Describe how you would handle this situation?
Answer:
You would inform your teacher but don't take any safety equipment off
Explanation:
don't try to clean it yourself, tell a teacher immediately
(i put it in the wrong section)
What is true about a pseudoscientific idea?
A) it can be replicated and verified.
B) It is improved with new information.
C) It ignores parts of the method within an investigation.
D) It tries to explain natural phenomena by analyzing, observing, and testing.
Answer: C
Explanation:
what is 1 amu
please give me proper answer
Answer:
Explanation:
An atomic mass unit (symbolized AMU or amu) is defined as precisely 1/12 the mass of an atom of carbon-12. The carbon-12 (C-12) atom has six protons and six neutrons in its nucleus. In imprecise terms, one AMU is the average of the proton rest mass and the neutron rest mass.
If 700 g of water at 90 °C loses 27 kJ of heat, what is its final temperature?
Answer:
If 700 g of water at 90 °C loses 27 kJ of heat, its final temperature is 106.125 °C
Explanation:
Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
In this way, between heat and temperature there is a direct proportional relationship (Two magnitudes are directly proportional when there is a constant so that when one of the magnitudes increases, the other also increases; and the same happens when either of the two decreases .). The constant of proportionality depends on the substance that constitutes the body and its mass, and is the product of the specific heat and the mass of the body. So, the equation that allows to calculate heat exchanges is:
Q = c * m * ΔT
Where Q is the heat exchanged by a body of mass m, constituted by a substance of specific heat c and where ΔT is the variation in temperature, ΔT= Tfinal - Tinitial
In this case:
Q= 27 kJ= 27,000 J (being 1 kJ=1,000 J)[tex]c=4.186 \frac{J}{g* C}[/tex]m=700 gΔT= Tfinal - Tinitial= Tfinal - 90 °CReplacing:
[tex]27,000 J=4.186 \frac{J}{g* C}*400 g* (Tfinal - 90C)\\[/tex]
Solving:
[tex]27,000 J=1,674.4 \frac{J}{C}* (Tfinal - 90C)[/tex]
[tex]\frac{27,000 J}{1,674.4 \frac{J}{C}} =(Tfinal - 90C)[/tex]
16.125 °C= Tfinal - 90 °C
Tfinal= 16.125 °C + 90 °C
Tfinal= 106.125 °C
If 700 g of water at 90 °C loses 27 kJ of heat, its final temperature is 106.125 °C
What is a key property of crystals?
Answer: Crystals differ in physical properties, i.e., in hardness, cleavage, optical properties, heat conductivity, and electrical conductivity.
These properties are important since they sometimes determine the use to which the crystals are put in industry.
hope this helps :)
Answer:
A crystals key properties are hardness, cleavage, optical properties, heat conductivity, and electrical conductivity.
Explanation:
These properties are important since they sometimes determine the use to which the crystals are put in industry.
what is the position of point X
Answer:
uh... where? what do you mean?
Explanation:
Which activity uses water for both recreational and industrial purposes?
machinery cooling
waterskiing
irrigation
fishing
Answer:
D. Fishing.
Explanation:
Fishing refers to an activity which typically involves catching fishes for both recreational (sports or hobby) and industrial (feeding or sales) purposes. In finishing, the fishes are caught from water such as a pool, lake, river etc. through the use of fishing nets, rod and lines and fish hooks.
Basically, when fishing is done with family members, peers or even individually such as on a vacation, sports competition and pleasure, it is mainly considered to be for recreational purposes.
However, when fishing is done on a commercial basis such as selling them consumers, it is considered to be for industrial purposes.
Hence, fishing is an activity which uses water for both recreational and industrial purposes.
Answer:
It's d fishing
Explanation:
got it correct on edge
HELP ASAP
When a carbon atom joins chemically with an oxygen atom, it makes carbon monoxide. What is the term for carbon monoxide? O A. A mixture B. An element O C. An alloy D. A molecule
D- A molecule
Explanation:
(Apex)
what property of material does salt possess
Answer:
in solid form salt form
Many enzymes are inhibited irreversibly by heavy metal ions such as Hg2+ , Cu2+ , or Ag+ , which can react with essential sulfhydryl groups to form mercaptides. Enz−SH+Ag+⟶Enz−S−Ag+H+ The affinity of Ag+ for sulfhydryl groups is so great that Ag+ can be used to titrate −SH groups quantitatively. To 10.0 mL of a solution containing 3.4 mg/mL of a pure enzyme, an investigator added just enough AgNO3 to completely inactivate the enzyme. A total of 0.134 μmol AgNO3 was required. Calculate the minimum molecular weight (????r) of the enzyme.
Answer:
Explanation:
one mole of AgNO₃ reacts to inactivate one mole of enzyme
mg of enzyme in 10 mL = 3.4 x 10 mg = 34 mg .
required AgNO₃ = .134 x 10⁻⁶ mole
.134 x 10⁻⁶ mole AgNO₃ is required for inactivating 34 mg of enzyme
1 mole of AgNO₃ will be required for inactivating 34 / (.134 x 10⁻⁶ ) mg of enzyme
= 253.73 x 10⁶ mg of enzyme
= 253.73 x 10³ g of enzyme
Mol weight of enzyme = 253.73 x 10³ .
Easy Questions for points: Aluminum is a -
Metal
Nonmetal
Metalloid
Answer:
a
Explanation:
aluminum is a metal
a prospector finds 39.39 g of gold. How many atoms of gold does he have
Answer:
the answers is 1.204×10/23
Explanation:
idek
According to Avogadro's number, there are 1.204 × 10²³ atoms in 39.39 g of gold.
To determine the number of atoms in 39.39 g of gold, we need to use the Avogadro's number, which is equal to 6.022 × 10²³ atoms/mol.
First, need to convert the given mass from grams to moles by dividing it by the molar mass of gold, which is 196.967 g/mol.
[tex]\dfrac{39.39}{196.96}\\=0.19999[/tex] moles
Now, we can use Avogadro's number to find the number of atoms:
[tex]0.19999\times6.023\tims10^2^3\\=1.204\times10^2^3[/tex]
Therefore, the prospector has 1.204 × 10²³ atoms of gold.
Learn more about Avogadro's number,here:
https://brainly.com/question/28812626
#SPJ6
Does each element have a specific number of valence electrons? How can you figure out how many valence electrons an element's atoms have?
Answer:
Detail is given below.
Explanation:
Each element have a specific number of valence electron. We can easily find out the number of valence electron in an atom through electronic configuration. The electrons reside in outer orbital are called valence electrons. It is also equal to the main group number of that element. Consider the example,
Sodium is present in group one thus it has 1 valence electron.
Electronic configuration of sodium:
Na₁₁ = 1s² 2s² 2p⁶ 3s¹
Let consider the example of halogens they are present in group 7A thus they have seven valence electrons.
Electronic configuration of fluorine:
F₉ = 1s² 2s² 2p⁵
The outer orbital contain seven electrons thus these are valance electron.
Copper is present in group 2B thus it must have two valence electrons.
Let check this from electronic configuration.
Cu₂₉ = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁹
The outer most orbital is 4s² and it has two electron thus number of valence electron in copper are 2.
What is made when sugar is dissolved in water?
Answer:
When you stir a spoonful of sugar into a glass of water, you are forming a solution.
Hydroxyl ions
Definition:
Answer:
the anion OH having one oxygen and one hydrogen atom.
Explanation:
When salt is dissolved in water, which is the solvent and which is the solute
Answer:
the solvent is water and the solute is salt
Explanation:
A solute is the component in a solution in the lesser amount. In a NaCl solution, the salt is the solute. A solution may contain more than one solute.
a. Why don't the lost atoms come back? los
I
Answer: Rubbing
Explanation: The lost atoms never come back because after rubbing, the molecules are shaking back and forth faster than they were billions of atoms. When molecules break apart or come together, that's called a nitrogen and oxygen molecules are lost this way too, but since their average velocity is so simplicity , that is missed by people who don't study physics.
what happens to the speed and acceleration when you let go
Answer:
the speed will increase and so will the acceleration. then after a bit the acceleration will decrease due to air resistance until there is no acceleration. Then the speed will continue to decrease when there is no acceleration anymore.
Explain how energy can be absorbed in a chemical reaction
Answer:
Energy is used to break bonds in reactants, and energy is released when new bonds form in products. ... In other chemical reactions, it takes more energy to break bonds in reactants than is released when bonds form in products. These reactions, called endothermic reactions, absorb energy.
Explanation:
Ca(ClO4)2
Ionic compound name
Answer:
I thing Calcium Perchlorate
a car is traveling 35 miles/hr for 17 miles. How much time has the car been on the road?
a
595 hours
b
2.1 hours
c
1.5 hours
d
0.49 hours
Answer:
The car has been on the road for 0.49 hours
Explanation:
A car is traveling 35 miles/hr for 17 miles.
Speed of a car = 35 miles/hr
Distance travelled = 17 miles
The relationship between speed, distance, and time is given by
Distance = Speed × Time
Put Speed = 35 miles/hr, Distance = 17 miles
[tex]17=35[/tex] × Time
Time = [tex]\frac{17}{35}=0.49[/tex] hours
So, the car has been on the road for 0.49 hours
The time car has been on the road has been 0.49 hours. Thus, option D is correct.
Speed can be defined as the distance traveled by the object in unit time. The speed can be expressed as:
[tex]\rm Speed\;=\;\dfrac{Distance}{Time}[/tex]
The car has been given to be traveling at:
Speed = 35 miles/hr
Distance traveled = 17 miles.
The time taken by car to travel 17 miles can be calculated by substituting the values as:
[tex]\rm 35\;miles/hr\;=\;\dfrac{17\;miles}{Time}\\\\\\\\Time\;=\;\dfrac{17\;miles}{35\;miles/hr}[/tex]
Time = 0.49 hr.
The time taken by car to travel 17 miles has been 0.49 hours. Thus, the correct option has been D.
For more information about speed, refer to the link:
https://brainly.com/question/7359669
When a substance is in the liquid state, how are the particles of that substance
behaving
Answer:
In liquids, particles are quite close together and move with random motion throughout the container. Particles move rapidly in all directions but collide with each other more frequently than in gases due to shorter distances between particles. With an increase in temperature, the particles move faster as they gain kinetic energy, resulting in increased collision rates and an increased rate of diffusion.
Explanation:
In liquids, particles are quite close together and move with random motion throughout the container. Particles move rapidly in all directions but collide with each other more frequently than in gases due to shorter distances between particles. With an increase in temperature, the particles move faster as they gain kinetic energy, resulting in increased collision rates and an increased rate of diffusion.
What state of matter is water at 80 degrees celsius?
Answer:
Liquid
Explanation:
Because water becomes a solid (freezes) at 0°C and becomes a gas (evaporates) at 100°C, it is liquid at any temperature in between.
What is one ecosystem you can think of? What non-living and living things are found in your ecosystem?