Answer:
B. single replacement
Explanation:
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:
Is hot chocolate a pure substance or a mixture? Explain.
Answer:
It is a mixture
Explanation:
Because it mixes chocolate, milk, sugar, and vanilla to make it sweet and not taste like plain cocoa powder.
Which is a pure substance?
A) mixture
B) solution
C) element
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.
when we don't use prefixe ina binary compound
Answer:
Explanation:
Answer will be wrong
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
Which is not a property of gold
A)rare
B)tarnishes
C)malleable
D)corrosion resistant
Answer:
B) Tarnishes
Explanation:
Gold is rare, Gold is malleable, Gold is corrosion resistant
Hope this helps!
what property of material does salt possess
Answer:
in solid form salt form
Changing subscripts is one of the steps of balancing a chemical equation.
True or False
Answer:
False
Explanation:
Changing the coefficients is one of the steps of balancing a chemical equation. Changing the subscript changes the compounds being used, while changing the coefficient changes the amount of each compound being used.
Give me a testable or researchable question to collect data about
Answer: What are black holes and how do they work?
Explanation:
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:
Please Answer Quickly
The graph shows distance versus time for an object
A.
A.The object is moving with increasing acceleration.
B.The object is moving with increasing velocity.
C.The object is moving with constant velocity.
D.The object is moving with constant acceleration.
Answer:
I Pretty sure its b
Explanation:
During which change of state do atoms lose energy
Answer: Atoms lose energy as a gas changes to a solid.
Explanation:
Answer:
Atoms lose energy as a gas changes to a solid.
Explanation:
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)
10. COMMUNITY EDUCATION A local community center offers self-defense classes for teens. A $25 enrollment
fee covers supplies and materials and open classes cost $10 each. Write an equation to represent the total cost of x
self-defense classes at the community center,
Answer:
25+10y=x
Explanation:
$25 initial cost
$10 per class (y)
total cost (x)
Easy Questions for points: Aluminum is a -
Metal
Nonmetal
Metalloid
Answer:
a
Explanation:
aluminum is a metal
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.
Choose all that apply below to DNA:
Question 1 options:
contains guanine
contains thymine
contains uracil
contains cytosine
takes the original code out of the nucleus and translate it into proteins
contains adenine
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:
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.
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.
Which element is identified by the chemical symbol C?
A)cobalt
B)carbon
C)calcium
D)chlorine
Answer:
B Carbon
Explanation:
I really hopes this helps you!
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!
1.
What are different ways that genetic technology is used?
Answer:
In medicine, genetic engineering has been used to mass-produce insulin, human growth hormones, follistim, human albumin, monoclonal antibodies, antihemophilic factors, vaccines, and many other drugs. In research, organisms are genetically engineered to discover the functions of certain genes.
Explanation:
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
Different kinds of light are all around us everyday, but we are invisible to it. Explain the type of light that is visible to humans and which types of light are not. Also explain why we can perceive some forms of light and not others.
Answer:
The human eye can only see white visible light and it contains all the colors of the rainbow, from red to violet.
Explanation:
But visable light comes in many "colors" such as radio, infrared, ultraviolet, X-ray, and gamma-ray that are invisible to the naked eye.The reason that the human eye can see the spectrum is because those specific wavelengths stimulate the retina in the human eye.
A substance has a volume of 20 mL and a density of 2.5 g/mL. What is its mass? (M=DxV)
Answer:
41
Explanation:
mate u literally just have to substitute the values into ur formula. u would then get 20 times 2.5 which is 41
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.
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 one ecosystem you can think of? What non-living and living things are found in your ecosystem?