Answer:
D. A bicycle rusting.
Explanation:
A. is incorrect because tearing a piece of paper is a physical change, not a chemical change.
B. is incorrect because we are just heating up the object. That only changes how fast the particles are moving and the change in state of matter.
C. is incorrect because we are adding heat to change a state of matter (from solid to liquid) and it is a physical change.
Therefore, only D. is the correct answer. Iron rusts, and when it does, it chemically changes into an iron oxide (rust).
Energy in a system is doing work such as kinetic and potential energy, that helps things move. Also more such as chemical, heat, thermal, etc.
Answer:
The answer is C - Theories are supported with evidence and do explain what we see in the world (Ex: The cell theory) The evidence can change or be added on to when new evidence is found.
Explanation:
A - Theories are not hypotheses but theories start out as hypotheses. When the hypotheses gain enough evidence, they can start to become a theory, and this is after many experimentations and testings and trials and research.
B - Everyone can have theories, not just scientists. Many theories have been made on social media platforms such as r e d d i t or y o u t u b e. Some of these theories are conspiracy theories that people make based on some evidence they gather about a topic and sometimes believe is true even though it may not be true.
D - Theories are not opinions but are backed up with evidence and may have went through many trials and errors to become where it is.
E - Theories are testable ideas and scientists are always trying to make theories to be the best of what it can be. Theories have to be tested over and over again to make sure that whatever the theory is about is still valid and works.
Voice box is what is commonly called
Answer:
negative
Explanation:
Lateral-flow pregnancy test
It is a device use to confirm the prsence or the absence of the target analyte , which can be biomakers or the pathogens .
The very common type of lateral flow rapid test is the pregnancy test .
Lateral - flow technology uses colored nano particles , nitrocellulose membrane and antibodies to produce result of pregnancy .
As the sample is added , it flows along the test device passing via the conjugate pad to the nitrocellulose membrane and then to the absorbent pad.
The blue band on the control;l line and no band on the test line , gives a negative test of pregnancy .
