How many kilograms of the rock must be processed to obtain 2.0 kg of Pb ?
Which one of these statements does not refer to radiation
warm air rises and takes heat with it
how many micrograms are in 2.45x10^3 grams?
Which activity would be an appropriate first step when designing an experiment?
Which of the following is a scientific question?
Why do leaves change color?
What time will the next earthquake happen?
What is the best flavor of ice cream?
Where is the fountain of youth?
The structure of a comet is considered to be like a large, ____, or a mass of frozen ice and rock. a. solid planet c. cratered moon b. dirty snowball
Which outcome occurs when bonds between atoms are broken or formed?
A.
a physical change
B.
an element increasing in size
C.
a chemical change
D.
a change of state
water is most dense at 4 degrees celsius. since at this temperature 1 ml of water has a mass of 1g its density is what
A double replacement reaction can be best described as a reaction in which
Answer:
Explanation:
A double repalcement reaction is a type of reaction in which there is exchange of ions between two compounds leading to the formation of new products. It is also known as double displacement reaction.
BC+DE produces BE+CD.
A double replacement reaction leads to the formation of two new compounds Be and CD.
Explain how heat would change the density of a parcel of air
As the air is heated the kinetic energy of particles increases rendering it less dense.
How is kinetic energy related to temperature?Kinetic energy is a type of energy possessed by the particles when they are in motion.Heating causes temperature to rise and as a result of which kinetic energy increases.Temperature and density are inversely proportional while temperature and kinetic energy are directly proportional.
As the temperature increases, kinetic energy increases and density decreases.Considering all these factors , air when heated up it's density decreases as the particles will move faster with increase in temperature, as heat is inversely proportional to density.
This type of phenomenon can be observed in deserts where the air is hot due to an increase in temperature.
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Honestly reporting experimental findings is an example of using good
Identify a chemical reagent that can be used to distinguish solid CaCl2 from CaCO3
What happens to the total mass of a substance undergoing a physical change
If your answer choices are:
It stays the same.
It doubles.
It triples.
It is reduced.
The correct answer is "It stays the same."
A rock has a volume of 50 mL and a mass of 200 g. What is the density??? please help
The andromeda galaxy is located approximate 2.5 million light-years from earth. Why is the light that Reaches earth 2.5 million years old
Jill said that when you are standing in front of a fire you are warm because you release the coolness of your body to the heat of the fire.
Greg said that when you are standing in front of a freezer with the door open you feel cool because you are releasing your heat into the freezer.
Who has made the accurate statement regarding heat transfer?
Jill is correct.
Greg is correct.
Both Jill and Greg are correct.
Neither Jill nor Greg are correct.
What is the ratio by mass of oxygen to carbon when 32 g of oxygen combine with 12 g of carbon?
Which is a TRUE statement about the subatomic particles that make up all neutral atoms?
A. The number of neutrons and the number of protons are the same.
B. The number of protons and the number of electrons are the same.
C. The number of electrons and the number of neutrons are the same.
Answer: The correct answer is Option B.
Explanation:
There are 3 subatomic particles present in an atom. They are: protons, electrons and neutrons.
Protons: They carry positive charger and are found in nucleus.Electrons: They carry negative charge and are found around the nucleus.Neutrons: They dos not carry any charge and are found in nucleus.Any neutral atom has equal number of protons and electrons.
Hence, the correct answer is Option B.
A scientific has a lot of support and is more than just a hunch
In the unit cell of galena, six square faces of equal size each form 90 degree angles with every adjacent face. What type of crystal system is this
the particles in a solid do not move is it true or false?
The tip of a match is ignited as it is struck against the matchbox. Why is this a chemical change?
The color of the match tip has changed.
The match changes size as it burns.
The tip of the match is flammable and is set on fire.
The match is melting.
This is a chemical change as the products have very different property as compared to reactant not only physically but also chemically. Therefore option c is correct option
What is chemical change?
Chemical change is a reaction in which breaking and forming of new bonds take place. One molecule completely converted to totally different molecule. The number of atoms remains same
One famous example of chemical change is the rusting of iron. In our case tip of match is ignited as it is struck against the matchbox, so here combustion reaction is taking place, Red phosphorous is burning in presence of oxygen. The color, odor and arrangements of atoms in products are very much different from reactant.
Therefore, the tip of the match is flammable and is set on fire is the correct one . The correct option is option C
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Please select the word from the list that best fits the definition. ______ occurs when particles in a gas lose enough energy to form a liquid.
A certain ore is 26.9% nickel by mass. How many kilograms of this ore would you need to dig up to have 50.0 g of nickel?
To extract 50.0 g of nickel from an ore that is 26.9% nickel by mass, you would need approximately 0.1859 kilograms of the ore.
To calculate the amount of ore needed to obtain 50.0 g of nickel, we use the percentage of nickel in the ore and set up a simple proportion.
Firstly, we know that the ore is 26.9% nickel by mass. This means that for every 100 g of ore, there are 26.9 g of nickel.
To get 50.0 g of nickel, we can set up the equation (26.9/100) × mass of ore = 50.0 g.
By rearranging the equation for the mass of the ore, we get the mass of the ore = (50.0 g) / (26.9/100).
Calculating the mass of the ore, we find it to be approximately 185.9 g, which we can then convert to kilograms.
To convert grams to kilograms, we divide by 1000. So, 185.9 g is equivalent to 0.1859 kg.
Therefore, to obtain 50.0 g of nickel, approximately 0.1859 kilograms of ore is required.
Explain why it is important that there be no gaps around the edges of the filter paper
during a vacuum filtration.
Vacuum filtration is a separation technique that is used to separate a solid product from a liquid. The method involves pouring the mixture of the solid and the liquid through a filter paper that is inserted inside a funnel. The filter paper trap the solid while the liquid is drawn through the funnel into the flask by a vacuum. It is very important to ensure that there is no gap around the edges of filter paper that is inserted into the funnel so that the mixture will not escape the filter paper and be poured directly into the flask below, thus messing up the separation process.
The graph represents the heating of water in a pot. At 150 seconds, the water has just reached a boil. If the heat is left on, what will happen to the temperature and volume of water in the pot? (All temperatures in °C.) Temperature graph A. The temperature will rise, and the water volume will decrease. B. The temperature will rise, and the water volume will remain constant. C. The temperature will remain constant, and the water volume will decrease. D. The temperature will remain constant, and the water volume will remain constant.
Answer:
c
Explanation:
compare and contrast sometimes you use your senses to make observations to find the answer to a question. Other times you use tools and measurements to provide answers. Compare and contrast these two methods of answering scientific questions.
Which is an example of a plasma that occurs in nature
Plasma is the most energetic state of matter and primarily consists of ionized gases. Natural examples of plasma include stars like the Sun and phenomena like lightning, which ionize gases due to their high temperature and energy.
Explanation:The question asks for an example of a plasma that occurs in nature. Plasma is the most energetic state of matter and is characterized by ionized gases made up of negatively charged free electrons and positively charged ions. In nature, stars such as the Sun are perfect examples of this. Stars, including the Sun, are so hot that the material they are composed of exists in the form of an ionized gas, or plasma. All particles in this state are rapidly in motion, continuously colliding with each other, leading to the pressure of the gas.
Not only stars, but certain weather phenomena such as lightning also contain plasma. The lightning's heat ionizes the gases in the atmosphere, leading to a plasma state. Therefore, the Sun and lightning are examples of plasma occurring naturally in the universe.
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During an oil spill, oil coats the surface of the water, endangering sea life. Why doesn’t oil dissolve in ocean water
what is the function of a hypothesis in the scientific inquiry process?