Answer:
D a ionic compound with properties different from magnesium or oxygen.
Explanation:
the particles in a solid do not move is it true or false?
A rock has a volume of 50 mL and a mass of 200 g. What is the density??? please help
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.
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.
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
the correct formula for aluminum phosphide
Which one of these statements does not refer to radiation
warm air rises and takes heat with it
How many kilograms of the rock must be processed to obtain 2.0 kg of Pb ?
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?
An atom with an atomic number of 12 and a mass number of 25 can best be described by which of these?A) An atom that contains 12 protons and 13 neutrons. B) An atom that contains 13 protons and 12 neutrons. C) An atom that contains 12 protons and 25 neutrons. D) An atom that contains 25 protons and 12 neutrons.
Answer: The correct answer is Option A.
Explanation:
An atom consists of 3 subatomic particles: Electrons, neutrons and protons.
Atomic number is equal to the number of electrons or number of protons.
Atomic number = Number of electrons = Number of protons ....(1)
Mass number is the sum of number of protons and number of neutrons.
Mass number = Number of protons + Number of neutrons .....(2)
We are given:
Atomic number = 12
Mass number = 25
From equation 1:
Number of protons = Number of electrons = 12
From equation 2:
Number of neutrons = 25 - 12 = 13
Thus, an atom contains 12 protons and 13 neutrons.
Hence, the correct answer is Option A.
Which activity would be an appropriate first step when designing an experiment?
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:
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?
Identify a chemical reagent that can be used to distinguish solid CaCl2 from CaCO3
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.
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 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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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
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.
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 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.
the density of gold is 19.3 g/cm^3. You inherit a gold bar that measures 7.0 in by 3.0 in by 2.0 in. How many ounces does the bar weigh? Express answer in scientific notation.
To find the weight of the gold bar, we need to calculate its volume and use the density of gold. The gold bar weighs approximately 467.96 ounces.
Explanation:To find the weight of the gold bar in ounces, we first need to calculate its volume in cubic inches and then convert it to cubic centimeters.
Given:
Length = 7.0 inchesWidth = 3.0 inchesHeight = 2.0 inchesThe volume (V) of a rectangular prism is given by V = Length x Width x Height.
V = 7.0 in x 3.0 in x 2.0 in = 42.0 in³
Since 1 inch is equal to 2.54 centimeters, we can convert the volume to cubic centimeters:
V = 42.0 in³ x (2.54 cm/in)³ = 686.98 cm³
Now, to find the weight of the gold bar in ounces, we can use the density of gold, which is 19.3 g/cm³.
The formula for density is Density = Mass/Volume.
Since we know the density and the volume, we can rearrange the formula to solve for the mass:
Mass = Density x Volume
Mass = 19.3 g/cm³ x 686.98 cm³ = 13,257.814 g
Finally, to convert the mass from grams to ounces, we divide by 28.35 grams/ounce:
Weight in ounces = 13,257.814 g / 28.35 g/oz = 467.96 oz
Therefore, the gold bar weighs approximately 467.96 ounces.
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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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.
A scientific has a lot of support and is more than just a hunch
how many micrograms are in 2.45x10^3 grams?
In the game of economics, goods are objects that fulfill peoples needs and ____.
Goods are objects that fulfill peoples needs and wants.
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."