Is elemental phosphorus dull or high luster?

Answers

Answer 1

Answer: The exception is the element hydrogen. ... solid at room temperature (with the exception of mercury); usually shiny; high melting point; good conductor of ... could be dull or shiny; conducts heat and electricity, but not as well as metals ... allotropes–Phosphorus, Selenium and Carbon (in the form of graphite.) ...

Related Questions

How do molecules move to the location of the chemical change
The name of a water solution of hydrogen fluoride, HF(g), is (A) fluoric acid (B) fluorous acid (C) perfluoric acid (D) hydrofluoric acid (E) hypofluorous acid
Give the significant figures of 0.011cm
Carbon monoxide is a poisonous gas.
Which tiny, round “factory” puts together protein and is often found in the endoplasmic reticulum?A.chromosomeB.chloroplastC.Golgi bodyD.ribosome

How are science and technology related?A. Technology is a branch of natural science.
B. Science is a branch of technology.
C. Advances in science may lead to advances in technology and vice versa.
D. Science and technology are not related

Answers

It's not A because technology is a branch of applied science. It's not B because again, technology is a branch of science, not the other way around. It's not D because they are related with one being a branch of another. Therefore, it has to be C because scientific advances do lead to technological advances.

C. Advances in science may lead to advances in technology and vice versa is the correct answer~

Would the following errors increase, decrease, or have no effect on the calculated moles of gas collected in the experiment? Explain your answers in complete sentences.a) The measured mass of the magnesium was smaller than the true mass.
b) The actual temperature of the hydrogen gas is less than room temperature.

Answers

a. If the actual mass of Magnesium used was larger then the measured and the amount of gas produced should be greater
b. when gas was cooler than its surroundings its density would be greater and the volume would appear to be smaller. This is because the gas molecules are very active and when heated they will expand.
so they both bound increase the calculated moles of gas collected in the experiment

Why is Neon in the same group of the periodic table as Helium?

Answers

Because they have a full outer shell and they are both noble gases...Because the outer shell has attained stable electronics configuration of octate rule this it is with noble gas as helium. Hope I helped!

1: Which of the following is the best example of a valid hypothesis?A. Children like brand X peanut butter better than brand Y peanut butter.
B. If I add substance X, then it will lower the temperature at which water freezes.
C. People should eat vegetables.
D. Bananas are better for you than chocolate. 2: Kobe is testing whether 100 g of substance A, 100 g of substance B, or 100 g of substance C produces more oxygen in a chemical reaction at 25°C. What is the independent variable?
A. the masses of the substances
B. the temperature of the substances
C. the amount of oxygen produced
D. the nature of the substances 3: A chemist measures the amount of mercury in sediment samples from three areas of a river (the source, the midway point, and the mouth). Which of the following is the most reasonable hypothesis for the chemist's experiment?
A. If a chemical plant near the source of the river is dumping mercury, then the mercury levels should be highest at the source and lowest at the mouth.
B. If a chemical plant near the source of the river is dumping mercury, then the mercury levels should be highest at the mouth and lowest at the midway point.
C. If a chemical plant near the source of the river is dumping mercury, then the mercury levels should be highest at the mouth and lowest at the source.
D. If a chemical plant near the source of the river is dumping mercury, then the mercury levels should be the same all along the river.

Answers

Below are the answers:

1. The best example of valid hypothesis is B which is "If I add substance X, then it will lower the temperature at which water freezes."

2. The answer for number 2 is D which is "the nature of the substances"

3. Its B which is " If a chemical plant near the source of the river is dumping mercury, then the mercury levels should be highest at the mouth and lowest at the midway point."

The correct options are as follows:

1. B.

In scientific investigation, an hypothesis refers to a supposition that is put forward to explain an observed phenomenon. A hypothesis is described as valid if it fulfilled five different conditions. The conditions are as follows:

1. It must be capable of empirical verification.

2. It must be express clearly and it must be definite and certain.

3. It must be specific and it is predictions must be clearly expressed.

4. It must be formulated in such a way that its content can easily be translated to understand the observed phenomenon that give birth to the hypothesis.

5. It should possess theoretical relevance.

2. D.

Scientific investigations usually make use of two major variables, these are dependent variables an independent variables. The dependent variable refers to the variable whose value depend on that of another variable. The independent variable on the other hand refers to that variable whose variation does not depend on the value of another variable. In the question given above, the natures of the three substances is the independent variable because their variation is not determined by any variable.

3. B.

If a chemical plant near the source of a water body is dumping mercury inside the water, then the highest amount of mercury will be found at the mouth of the river while the lowest quantity of mercury will be found at the middle of the water. This is because as the water waves are carrying the mercury deposits away from the mouth of the river, they will disperse it evenly in the river and thus its concentration will reduce compare to that present at the mouth of the river. The highest amount of mercury is found at the mouth of the river because that is where the mercury enters the water.

Differentiate between atoms, elements, molecules and compounds

*URGENT

Answers

Atoms are the simpliest form of matter. But an atom can be classified as an element and an element can be presented various substance. An element can be oxygen, hydrogen and so on. The combination of two or more elements is a compound. A compound can be a molecule, same as the atom to element.

What is the approximate pH at the equivalence point of a weak acid-strong base titration if 25 mL of aqueous formic acid requires 29.80 mL of 0.3567 MNaOH? Ka = 1.8×10−4 for formic acid.